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WO2018196121A1 - Procédé et dispositif destinés à être utilisés lors de la détermination d'un court-circuit interne d'une batterie - Google Patents

Procédé et dispositif destinés à être utilisés lors de la détermination d'un court-circuit interne d'une batterie Download PDF

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Publication number
WO2018196121A1
WO2018196121A1 PCT/CN2017/088280 CN2017088280W WO2018196121A1 WO 2018196121 A1 WO2018196121 A1 WO 2018196121A1 CN 2017088280 W CN2017088280 W CN 2017088280W WO 2018196121 A1 WO2018196121 A1 WO 2018196121A1
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WO
WIPO (PCT)
Prior art keywords
battery
time
current
short circuit
preset
Prior art date
Application number
PCT/CN2017/088280
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English (en)
Chinese (zh)
Inventor
陈良金
蒋建平
房伟
崔瑞
许波鑫
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780089490.9A priority Critical patent/CN110506215A/zh
Publication of WO2018196121A1 publication Critical patent/WO2018196121A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of electronics, and in particular, to a method and apparatus for determining a short circuit in a battery.
  • the essence of the short circuit in the battery is the short-circuit resistance in which the discharge is formed inside the battery.
  • the battery model before and after the internal short circuit occurs (a) shows a normal battery model, and (b) shows an equivalent battery model in which an internal short circuit has occurred.
  • the short-circuit resistance 1 of the battery is parallel with the internal resistance R of the battery. Since the internal resistance of the battery is very small, it is usually in the order of ten milliohms, even in parallel.
  • a short-circuit resistor is also difficult to measure the short-circuit resistance, so the short-circuit resistance cannot be directly measured to determine if the battery is internally short-circuited.
  • the industry proposes a method for determining the short circuit in the battery, and pre-stores the reference power required to charge the battery voltage from the first battery voltage to the second battery voltage.
  • the battery voltage is cumulatively measured.
  • the accumulated electric quantity required until the first battery voltage is charged to the second voltage is determined to be a short circuit inside the battery when the accumulated electric quantity is greater than the reference electric quantity.
  • the above-mentioned short circuit solution of the battery can only be implemented in the charging scenario, and the application scenario is limited, and the short circuit inside the battery cannot be found in time.
  • the load will affect the charging current, which in turn affects the voltage and power detected during the charging process. If the load causes the battery to increase during charging, it will cause a short circuit in the battery. Therefore, the above-mentioned scheme for determining the short circuit in the battery cannot accurately determine the short circuit in the battery in each scene in time.
  • the embodiment of the present application provides a method and a device for determining a short circuit in a battery, so as to accurately determine a short circuit in the battery in each scene in time.
  • the method provides a short circuit in the battery is determined, the method specifically comprises: first measuring the battery open circuit voltage OCV t 1 is a time, obtaining a predetermined correspondence between the OCV corresponding to the remaining battery charge Q OCV1, power from the battery and records relevant to the system time t 1 to flowing through the battery current integration Q CC1; wherein the predetermined relationship comprises the corresponding relationship between the open-circuit voltage of the battery corresponding to the remaining power; then, the battery open circuit voltage OCV measured at time t 2 2 , obtain the remaining battery power Q OCV2 of the battery corresponding to OCV 2 in the preset correspondence relationship, and record the current integral Q CC2 flowing through the battery from the time when the battery belongs to the system to t 2 ; according to Q OCV1 , Q CC1 , Q OCV2 , Q the CC2, the battery 1 is calculated between a time t 2 to time t, the short-circuit power in the battery per unit time difference generated, the short circuit current of the battery I ISC;
  • the method for determining the short circuit in the battery utilizes the corresponding relationship between the open circuit voltage of the battery and the battery capacity, obtains the corresponding battery power change by measuring the two open circuit voltages, and the current integral change flowing through the battery during the two open circuit voltage test, Further, the current value generated by the short circuit in the battery per unit time is obtained, and when the current value is greater than or equal to the preset threshold, it is determined that the battery is internally short-circuited.
  • the implementation of the scheme has no limitation on the scene in which the battery is located, and due to the accurate correspondence between the open circuit voltage and the battery capacity, it is possible to accurately determine the short circuit inside the battery in various scenarios, and facilitate battery management.
  • time t 1 and the time t 2 are the times at which the battery open circuit voltage can be measured, and the time t 2 is later than the time t 1 on the time axis.
  • the amount of power generated by the short circuit in the battery per unit time between time t 1 and time t 2 is calculated.
  • Poor, as the internal short-circuit current I ISC of the battery, can be realized as: calculation
  • the preset correspondence may include a correspondence between an open circuit voltage of the battery and a remaining power at different battery temperatures.
  • the method for determining the short circuit in the battery provided by the embodiment of the present application may further include: acquiring the temperature T 1 of the battery at time t 1 before acquiring the remaining power quantity Q OCV1 of the battery corresponding to the OCV 1 in the preset correspondence relationship;
  • obtaining the remaining battery power Q OCV1 of the battery corresponding to the OCV 1 in the preset correspondence relationship includes: acquiring the remaining battery power Q OCV1 of the battery corresponding to the OCV 1 at the temperature T 1 in the preset correspondence relationship.
  • the method for determining the short circuit in the battery may further include: acquiring the temperature T 2 of the battery at time t 2 before acquiring the remaining power Q OCV2 of the battery corresponding to the OCV 2 in the preset correspondence relationship.
  • obtaining the remaining battery power Q OCV2 of the battery corresponding to the OCV 2 in the preset correspondence relationship includes: obtaining the remaining battery power Q OCV2 of the battery corresponding to the OCV 2 at the temperature T 2 in the preset correspondence relationship.
  • t is time and the second time interval time t 1 t 2 -t 1, is greater than or equal to a first predetermined time interval. It ensures that the power difference caused by the short-circuit current in the battery is accumulated to improve the calculation accuracy.
  • the remaining battery power included in the preset correspondence relationship is the remaining battery power percentage SOC
  • OCV 2 corresponds to the remaining battery capacity
  • FCC can be the theoretical rated full charge of the battery; or, FCC is the current rated full charge of the battery.
  • the initial value of the FCC is the theoretical rated full charge of the battery of the battery, and as the battery ages, the rated full capacity of the battery is gradually reduced, and the capacity can be self-learned.
  • the method is to get the current rated full charge of the battery in real time as the FCC.
  • the time t 1 or the time t 2 is a time when the battery is in an equilibrium state; the balanced state includes a current flowing through the battery per unit time The duration less than or equal to the preset current threshold is greater than or equal to the second preset time interval.
  • the battery is in equilibrium with the battery open circuit, and the open circuit voltage can be measured at this time, which ensures the implementability of the solution of the present application.
  • the present application before obtaining the remaining power quantity Q OCV1 of the battery corresponding to the OCV 1 in the preset correspondence relationship, the present application provides determining the internal short circuit of the battery.
  • the method may further include: after the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to the different remaining power of the battery is tested to form a preset correspondence relationship.
  • the different remaining power of the battery can be achieved by stepping discharge.
  • the preset correspondence is obtained in advance to ensure the real-time performance of the solution of the present application.
  • measuring the open circuit voltage OCV 1 of the battery at time t 1 may specifically include: after the battery is stabilized, measuring the battery at time t 1 Open circuit voltage OCV 1 .
  • the definitions of battery stability are different in different scenarios.
  • the battery stability may include: the battery voltage is greater than or equal to the linear threshold, waiting for the battery to stop charging, keeping the charger powered to the system, and isolating the battery, waiting The third preset time interval.
  • the battery stabilization may specifically include: setting a fourth preset time interval. If the battery-powered system is in the standby state, the battery stability may include: after the system is woken up, the time difference between the current time and the system entering the standby state is greater than or equal to the fifth preset time interval.
  • the method for determining the short circuit in the battery provided by the present application may further include: determining whether the temperature difference of the battery is less than or equal to the temperature threshold at time t 2 and time t 1 .
  • Calculate the battery internal short-circuit current I ISC specifically comprises: when the temperature difference between the time t 2 and time t 1 is less than or equal to the battery temperature threshold, the battery is calculated in the short-circuit current I ISC.
  • the time t 2 is taken as the time t 1 , and the parameter assignment for calculating the internal short-circuit current I ISC of the battery is recorded. After the battery is stabilized, the next time is The time at which the open circuit voltage is measured is taken as the time t 2 , and the solution of the embodiment of the present application is re-executed.
  • the battery temperature variation during the execution of the solution of the present application is guaranteed to be within a certain range to improve the accuracy of the results of the present application.
  • an apparatus for determining a short circuit within a battery comprising a voltage measuring unit, a calculation and processing unit, and a current integration measuring unit.
  • the voltage measuring unit is configured to measure an open circuit voltage of the battery at different times;
  • the calculating and processing unit is configured to obtain a remaining power of the battery corresponding to each open circuit voltage measured by the voltage measuring unit in the preset correspondence relationship; wherein, the preset corresponding The relationship includes the correspondence between the open circuit voltage of the battery and the remaining power;
  • the current integral measuring unit is used for measuring the current integral flowing through the battery at each time from the start of the system to which the battery belongs to the voltage measuring unit to measure the open circuit voltage;
  • the calculation and processing unit also uses According to Q OCV1 , Q CC1 , Q OCV2 , Q CC2 , calculate the difference in the amount of electricity generated by the short circuit in the battery between time t 1 and time t 2 , as the internal short circuit current I ISC of the battery;
  • Q OCV1 and Q OCV2 are
  • a recording unit measures power from the battery of the system belongs to time t 1, t 2 time flowing through the battery current integration; with calculation and processing unit further Therefore , if the I ISC is greater than or equal to the preset threshold, it is determined that the battery is short-circuited.
  • the calculation and processing unit calculates, according to Q OCV1 , Q CC1 , Q OCV2 , and Q CC2 , the battery is short-circuited within a unit time between time t 1 and time t 2 .
  • the generated electric quantity difference, as the internal short-circuit current I ISC of the battery, can be realized as: calculation
  • the current integration measurement unit may include a current measurement module and an integration module.
  • the current measuring module is used to measure the current flowing through the battery; the integrating module is used to integrate the current measured by the current measuring module.
  • a device for determining a short circuit in a battery can implement the functions in the above method example, and the function can be implemented by hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the apparatus for determining a short circuit in a battery includes a processor and a collector configured to support the device for determining a short circuit in the battery to perform the corresponding method in the foregoing method The function.
  • the collector is configured to support the parameter of the battery collection device that determines the short circuit in the battery.
  • the means for determining a short circuit within the battery can also include a memory for coupling with the processor that retains the program instructions and data necessary to determine the short circuit within the battery.
  • an embodiment of the present application provides a computer storage medium for storing computer software instructions for use in determining the short circuit in a battery, which includes a program designed to perform the above aspects.
  • FIG. 1 is a schematic diagram of a battery model provided by the prior art
  • FIG. 1a is a schematic structural diagram of a battery working scene architecture provided by the prior art
  • FIG. 2 is a schematic structural diagram of an apparatus for determining a short circuit in a battery according to an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a battery working scenario architecture according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flow chart of a method for determining a short circuit in a battery according to an embodiment of the present application
  • 4a is a schematic flow chart of another method for determining a short circuit in a battery according to an embodiment of the present application
  • FIG. 5 is a schematic diagram of an internal architecture of a charging chip for sub-path management according to an embodiment of the present application.
  • FIG. 6 is a schematic flow chart of another method for determining a short circuit in a battery according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a device and a battery connection structure for determining a short circuit in a battery according to an embodiment of the present application
  • FIG. 9 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of another connection structure of a device for determining a short circuit in a battery according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application.
  • the current method for determining the short circuit in the battery is to compare the accumulated electric quantity of the charging with the theoretical reference electric quantity during the charging process of the battery, which is easy to cause misjudgment and the judgment is inaccurate.
  • the power of the battery does not match the remaining power, and the remaining power of the battery can accurately correspond to the open circuit voltage of the battery.
  • the basic principle of the application is: the remaining power of the battery
  • the open circuit voltage of the battery can be accurately matched.
  • the amount of change of the remaining power during the operation of the battery is obtained, and the difference between the change amount and the accumulated power of the flow battery during the operation of the battery is calculated and divided by the time, that is, The current formed by the internal short circuit can be obtained. If the current exists and is greater than the threshold, it can be determined that the battery is internally short-circuited. If the current is less than the preset threshold, it is determined that the battery does not have an internal short circuit.
  • the entire determination process utilizes the acquisition parameters of the battery and is not limited by the battery scene, thereby accurately determining the short circuit in the battery under various scenarios.
  • the battery described in the present application can be a power supply battery in any system that is powered by a battery in the electronic field.
  • the system described herein may include, but is not limited to, a terminal, power steam Car and so on.
  • the terminal is the mobile communication device used by the user.
  • the terminal can be a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an e-book, a mobile TV, a wearable device, a personal computer ( Personal Computer, PC) and more.
  • the embodiment of the present application does not specifically limit the type of the terminal.
  • the architecture includes a battery 101, a charging module 102, an external charger 103, and a system 104 powered by the battery 101.
  • the battery 101 includes a battery cell 1011.
  • FIG. 1a merely illustrates the architecture of the battery working scenario by way of example, and is not limiting.
  • the embodiment of the present application does not specifically limit the performance of the battery 101, such as the type and capacity.
  • the type of the system 104 for powering the battery 101 is not specifically limited in the embodiment of the present application.
  • some battery operating architectures also include protection circuits, as shown in Figure 1a.
  • an embodiment of the present application provides an apparatus for determining a short circuit within a battery.
  • 2 shows an apparatus 20 for determining a short circuit within a battery associated with various embodiments of the present application.
  • the device 20 for determining a short circuit within the battery can be coupled to the battery 101 in the battery operating scene architecture shown in FIG. 1a for determining if the battery 101 is internally shorted.
  • Figure 3 illustrates that the device 20 for determining a short circuit within the battery is used in the battery operating scenario architecture illustrated in Figure 1a, in connection with the battery 101.
  • the apparatus 20 for determining a short circuit within the battery may include a processor 201, a memory 202, and a collector 203.
  • the specific components of the device 20 for determining the short circuit in the battery will be specifically described below with reference to FIG. 2:
  • the memory 202 may be a volatile memory such as a random-access memory (RAM) or a non-volatile memory such as a read-only memory. , ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); or a combination of the above types of memory for storing a program that implements the method of the present application Code, data, and configuration files.
  • RAM random-access memory
  • non-volatile memory such as a read-only memory. , ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); or a combination of the above types of memory for storing a program that implements the method of the present application Code, data, and configuration files.
  • the processor 201 is a control center of the device 20 for determining a short circuit in the battery, and may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or configured to be implemented.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • One or more integrated circuits of the embodiments of the present application for example, one or more digital singular processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
  • DSPs digital singular processors
  • FPGAs Field Programmable Gate Arrays
  • the processor 201 can perform various functions of the device 20 for determining a short circuit within the battery by running or executing a software program and/or module stored in the memory 202, and recalling data stored in the memory 202.
  • the collector 203 is used to collect parameters of the battery connected to the device 20 that determines the short circuit within the battery, and is provided to the device 20 that determines the short circuit within the battery to support the device 20 that determines the short circuit within the battery to perform various functions.
  • the collector 203 can collect the open circuit voltage of the battery, the current integral flowing through the battery, The temperature of the battery.
  • the collector 203 when the collector 203 is used to collect the temperature of the battery, the collector 203 can be implemented by a temperature sensor, and the temperature sensor can pass a positive temperature coefficient (PTC) thermistor and a negative temperature coefficient (Negative Temperature Coefficient). , NTC) Thermistors, thermocouples and other temperature measuring device devices and their auxiliary circuits are implemented.
  • PTC positive temperature coefficient
  • NTC negative temperature coefficient
  • ADC analog to digital converter
  • the sampling resistor can be connected in series to any pole of the battery, and the voltage across the battery can be calculated by the voltage measured by the ADC to calculate the current flowing through the battery, and then the current is passed through the integrating circuit. Cumulative current integration is obtained.
  • the integration circuit can be implemented by a coulomb counter.
  • the foregoing specific implementation of the collector 203 is merely an example and is not specifically limited to the implementation manner of the collector 203.
  • the specific implementation of the configuration 203 can be configured according to the actual requirements, and the acquisition processor 201 determines the parameters of the battery required when the battery is short-circuited.
  • the processor 201 performs the following functions by running or executing a software program and/or module stored in the memory 202, and calling data stored in the memory 202:
  • the open circuit voltage OCV 1 of the battery at time t 1 is measured by the collector 203, and the remaining power Q OCV1 of the battery corresponding to the OCV 1 in the preset correspondence is obtained , and the collector 203 collects and records the flow from the system to the time t 1 of the battery.
  • the battery current integration Q CC1 wherein the preset corresponding relation comprises a battery open circuit voltage and the remaining power; measured by collecting cell 2 203, acquires open circuit voltage OCV t 2 time preset correspondence between the OCV 2
  • the remaining battery power Q OCV2 of the corresponding battery is recorded by the collector 203 from the current integration Q CC2 flowing through the battery from the system to which the battery belongs to the time t 2 ; according to Q OCV1 , Q CC1 , Q OCV2 , Q CC2 , the battery is calculated at t 1
  • the time difference between the time and the time t 2 the short circuit caused by the short circuit in the battery per unit time, as the internal short circuit current I ISC of the battery; if the I ISC is greater than or equal to the preset threshold, the short circuit in the battery is determined.
  • an embodiment of the present application provides a method for determining a short circuit in a battery, which is applied to a device for determining a short circuit in a battery, for determining whether an internal short circuit occurs in a battery connected to a device for determining a short circuit in the battery.
  • the method may include:
  • the preset correspondence may include a correspondence between an open circuit voltage of the battery and a remaining power. After obtaining the open circuit voltage of the battery at a certain time, by querying the preset correspondence, the remaining battery power corresponding to the open circuit voltage can be obtained.
  • the remaining power of the battery included may be the absolute value Q of the remaining power, or may be the remaining SOC of the power, which is not specifically limited in this embodiment of the present application.
  • the remaining power of the battery is the absolute value of the remaining battery Q.
  • the preset correspondence relationship is obtained.
  • the remaining power of the battery included in the preset correspondence is the remaining battery percentage SOC
  • the remaining power corresponding to the open circuit voltage is first read to obtain the remaining percentage SOC of the power, and then multiplied by the FCC to obtain the remaining battery power.
  • the FCC is the theoretical rated full charge of the battery; or, the FCC is the current rated full charge of the battery.
  • the FCC when the FCC is the theoretical rated full charge of the battery, the FCC is a fixed value that does not change, determined by the initial performance of the battery, and the rated nominal parameter of the battery.
  • the FCC when the FCC is the current rated full charge of the battery, the FCC changes according to the performance of the battery.
  • the initial value is the theoretical rated full charge of the battery. As the battery ages, the rated full capacity will gradually decrease. The method obtains the full capacity of the battery under different aging procedures and records, and the current rated full power of the battery is the full capacity of the newly recorded battery.
  • the content of the method for capacity self-learning is not specifically limited in the embodiment of the present application, and may be selected according to actual needs. Any method that can be used to learn the latest full power of the battery can be used as the capacity described herein. study method.
  • the remaining power of the battery included in the preset correspondence is the remaining battery percentage SOC
  • the percentage of battery remaining capacity corresponding to OCV 1 is the percentage of battery remaining capacity corresponding to OCV 1 .
  • the content in the preset correspondence relationship may be configured according to actual requirements, and the preset correspondence relationship may include only the correspondence between the open circuit voltage of the battery and the remaining power, as shown in Table 1 below.
  • the preset correspondence may include a correspondence between the open circuit voltage of the battery and the remaining power at different battery temperatures, as shown in Table 2 below.
  • the content shown in Table 1 or the content shown in Table 2 may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • the preset correspondence may only include the correspondence between the open circuit voltage of the battery and the remaining power.
  • the preset correspondence may include the open circuit voltage and the remaining power of the battery under different battery temperatures.
  • the example here is only an example to describe the content of the preset correspondence, and is not limited thereto.
  • Tables 1 and 2 only illustrate the content of the preset correspondence by way of example, and are not limited to the content and form of the preset correspondence.
  • preset correspondences such as graphs or fitting formulas may be stored using content other than the table.
  • the content in the preset correspondence can be generated according to actual measurements.
  • the remaining power included in the preset correspondences shown in Table 1 and Table 2 is the percentage of the remaining power. The example is not limited. As mentioned above, the remaining power included in the preset correspondence may also be the absolute value of the remaining battery power. .
  • the remaining power of the battery corresponding to the OCV 1 in the preset correspondence is obtained in S401.
  • the method for determining the short circuit in the battery provided by the embodiment of the present application before the Q OCV1 may further include S401a.
  • the battery short-circuit determination means acquires the temperature of the battery at the time t 1 T 1.
  • S401a and the S401 may be executed at the same time, or may be performed in succession.
  • the embodiment of the present application does not specifically limit this.
  • the figure only illustrates the execution order of S401a and S401, but it is not specific to this. limited.
  • the remaining power quantity Q OCV1 of the battery corresponding to the OCV 1 in the preset correspondence relationship is obtained in S401, including: acquiring the remaining power quantity Q OCV1 of the battery corresponding to the OCV 1 at the temperature T 1 in the preset correspondence relationship.
  • the content included in the preset correspondence relationship is usually obtained by interpolation. Therefore, the measured open circuit voltage value may not be included in the preset correspondence relationship. In this case, the preset correspondence relationship may be obtained. The measured open circuit voltage value is close to the remaining power corresponding to the two open circuit voltage values, and then the remaining power corresponding to the measured open circuit voltage is obtained in equal proportion.
  • the preset correspondence relationship may not include the corresponding relationship between the open circuit voltage of the battery and the remaining power at the measured battery temperature.
  • the measured battery temperature may be obtained in the preset correspondence relationship before and after the temperature is close to two temperatures.
  • the remaining power of the open circuit voltage value is equal to the measured value.
  • the time t 1 of measuring the open circuit voltage is the time when the battery is in the equilibrium state.
  • the battery is equivalent to the open circuit state, and at this time, the open circuit voltage can be directly measured.
  • Defining the balance state of the battery includes a duration in which the current flowing through the battery per unit time is less than or equal to a preset current threshold, greater than or equal to a second predetermined time interval.
  • preset current threshold and the duration of the second preset time interval may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • S401 can be implemented by the collector 203 in the apparatus for determining a short circuit within the battery illustrated in FIG.
  • measuring the open circuit voltage of the battery can be measured by an ADC.
  • the current integral flowing through the battery is measured, and the current flowing through the battery can be calculated by connecting the voltage across the battery through the resistance of the ADC, and the current is integrated after being accumulated.
  • the battery corresponding to the OCV 2 in the preset correspondence is acquired in S402.
  • the method of the remaining amount Q OCV2, determining the short circuit of the battery according to this embodiment may further include application S401a.
  • the battery short-circuit determination means acquires the temperature of the battery at the time t 2 T 2.
  • S402a and the S402 may be executed at the same time, or may be performed sequentially. This embodiment of the present application does not specifically limit this. The figure only illustrates the execution order of S402a and S402, but it is not specific to this. limited.
  • the remaining power quantity Q OCV2 of the battery corresponding to the OCV 2 in the preset correspondence relationship is obtained in S402, including: acquiring the remaining power quantity Q OCV2 of the battery corresponding to the OCV 2 at the temperature T 2 in the preset correspondence relationship.
  • the time t 2 of measuring the open circuit voltage is the time when the battery is in the equilibrium state.
  • the battery is equivalent to the open circuit state, and at this time, the open circuit voltage can be directly measured.
  • time t 1 and the time t 2 may be the time when the battery open circuit voltage can be measured twice in succession, or the time when the battery open circuit voltage can be measured in two consecutive times, which is not specifically described in this embodiment of the present application. limited. As long as the time t 2 is after the time t 1 .
  • the time interval t 2 -t 1 of performing S402 and executing S401 is greater than or equal to the first preset time interval, so that the power accumulation is obvious, and the accuracy of the calculation is ensured.
  • the first preset time interval may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • the first preset time interval may be half an hour or one hour.
  • Q OCV1 -Q OCV2 represents the amount of change in the remaining capacity of the battery between time t 1 and time t 2
  • the amount of change in the remaining capacity of the battery between time t 1 and time t 2 is a decrease amount
  • Q OCV1 -Q OCV2 is a positive value
  • the amount of change in battery residual capacity between time t 1 and time t 2 is an increase
  • Q OCV1 -Q OCV2 is a negative value
  • Q CC2 -Q CC1 indicates time t 1 to time t 2 between the total amount of electricity of the battery outward, a scene in the discharge time t 1 to time t 2 between the total amount of electricity in the battery to increase the amount of outward
  • Q CC2 -Q CC1 is a positive value
  • the total amount of power supplied by the battery between t 1 and t 2 is the amount of reduction
  • Q CC2 -Q CC1 is a negative value
  • the difference between Q OCV1 -Q OCV2 and Q CC2 -Q CC1 The amount of discharge of the internal short-circuit resistance in the presence of an internal short circuit.
  • Q OCV1 -Q OCV2 when the battery is in a discharge scenario, Q OCV1 -Q OCV2 is greater than or equal to Q CC2 -Q CC1 , and when the battery is in a charging scenario, Q OCV1 -Q OCV2 is less than or equal to Q CC2 -Q CC1 .
  • the difference between the two when the battery does not have an internal short circuit, the difference between the two is less than the preset threshold.
  • the difference between the two is greater than or equal to the preset threshold. The difference between the two is divided by the time difference from the time t 1 to the time t 2 , and the current caused by the internal short circuit is obtained.
  • the following describes the process of calculating the internal short-circuit current I ISC of the battery by taking the discharge scene and the charging scene as an example.
  • the measured system current is connected to the current integral of the battery at time t 2
  • I ISC is greater than or equal to a preset threshold
  • the device for determining a short circuit in the battery determines a short circuit in the battery.
  • the preset threshold can be configured according to actual requirements, which is not specifically limited in this application. Exemplarily, if the battery-powered system is a mobile phone, the preset threshold can be configured to be small, for example, a few milliamps; if the battery-powered system is a vehicle, the preset threshold can be configured to be large, for example, several tens of milliamps; The value is determined according to actual needs.
  • the preset threshold is determined to increase the present The accuracy of the program to avoid misjudgment.
  • the battery may be a steady state at a next time t 1, S401 to S404 process re-executed, it is determined whether the battery short-circuited.
  • time t 2 may be used as time t 1, the time t 2 the parameter acquired in S402 as a time t 1 acquired in S401, S404 and then the next cell after the time t 2 as the steady state, re-run The process of S402 to S404 determines whether the battery has an internal short circuit.
  • the method for determining the short circuit in the battery utilizes the corresponding relationship between the open circuit voltage of the battery and the battery capacity, obtains the corresponding battery power change by measuring the two open circuit voltages, and the current integral change flowing through the battery during the two open circuit voltage test, Further, the current value generated by the short circuit in the battery per unit time is obtained, and when the current value is greater than or equal to the preset threshold, it is determined that the battery is internally short-circuited.
  • the implementation of the scheme has no limitation on the scene in which the battery is located, and due to the accurate correspondence between the open circuit voltage and the battery capacity, it is possible to accurately determine the short circuit inside the battery in various scenarios, and facilitate battery management.
  • the method for determining a short circuit in a battery provided by the embodiment of the present application is used to evaluate whether an internal short circuit occurs in a battery in a battery charging state, a battery full state, a battery discharging state, a battery discharging standby state, and the like.
  • the method for determining the short circuit in the battery provided by the embodiment of the present application is not affected by the state of the battery.
  • the open circuit voltage OCV 1 of the battery at time t 1 is measured in S401, and specifically, after the battery is stabilized, the open circuit voltage OCV 1 of the battery at time t 1 is measured. .
  • the open circuit voltage OCV 2 of the battery at time t 2 is measured in S402, and specifically, after the battery is stabilized, the open circuit voltage OCV 2 of the battery at time t 2 is measured.
  • the battery stability it can be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • the following example describes a definition of battery stability that is concentrated, but is not specifically limited to the definition of battery stability.
  • the battery stability is defined as: the battery voltage is greater than or equal to the linear threshold, the battery is stopped, the charger is powered to the system, and the battery is isolated, waiting for a third preset time interval.
  • Figure 5 illustrates the internal architecture of a conventional sub-path managed charging chip that charges the battery while powering the system. When the battery is fully charged, you can control the switch in the figure below to turn off the battery, or to disconnect the battery during the charging process.
  • the battery stability is defined as: resting for a fourth preset time interval.
  • the non-charging state may include a full-stand state, that is, a charging completion state.
  • the battery stability is defined as: the time difference between the current time and the system entering the standby state after the system is woken up is greater than or equal to the fifth preset time interval.
  • linear threshold the third preset time interval, the fourth preset time interval, and the fifth preset time interval may be configured according to actual requirements, and the embodiment of the present application does not specifically limited.
  • the method for determining the short circuit in the battery provided by the embodiment of the present application may further include S405. It should be noted that, in FIG. 6 of the embodiment of the present application, only the basis of FIG. 5 is used, but the specific method for determining the short circuit in the battery provided by the embodiment of the present application is not specifically limited. The steps further included in FIG. 6 compared to FIG. 5 may also be included on the basis of the method for determining the short circuit in the battery illustrated in FIG. 4, and will not be further described herein.
  • the preset correspondence is established in S405, which may be performed in a laboratory measurement, or may be performed in a battery operation process by machine learning, which is not specifically limited in this embodiment of the present application.
  • a process for constructing a preset correspondence relationship including: after the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to different remaining powers of the battery is tested to form a preset correspondence relationship.
  • the description here is a construction process in which the preset correspondence includes the correspondence between the open circuit voltage of the battery and the remaining power at different temperatures.
  • the preset correspondence only includes the correspondence between the open circuit voltage of the battery and the remaining power
  • the open circuit voltage corresponding to the different remaining power of the battery is tested at a predetermined temperature to form a preset correspondence.
  • the predetermined temperature may be determined according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • the following describes, by way of example, a process of obtaining a correspondence between the open circuit voltage of the battery and the remaining power at a certain temperature: at this temperature, the battery is fully charged, and at this temperature, after the standstill, the remaining power is 100 at this time. %, measure the open circuit voltage at this time; then discharge 5%, test the battery open circuit voltage when the remaining charge is 95%; repeat this until the battery charge is zero. In this way, the corresponding relationship between the open circuit voltage of the battery and the remaining power at this temperature is obtained.
  • the determining battery provided by the embodiment of the present application
  • the method of the inner short circuit may further include S406 before S403.
  • the device for determining a short circuit in the battery determines whether the temperature difference between the battery at time t 2 and time t 1 is less than or equal to a temperature threshold.
  • the temperature threshold is used to control the temperature range of the battery during the two sampling processes when implementing the embodiment of the present application.
  • the value of the temperature threshold can be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.
  • the internal short-circuit current I ISC of the battery is calculated in S403.
  • the temperature difference of the battery is greater than the temperature threshold.
  • the battery may be a steady state at a next time t 1, S401 to S404 process re-executed, it is determined whether the battery short-circuited.
  • time t 2 may be used as time t 1, the time t 2 S402 is acquired at time t 1 as a parameter acquired in S401, S406 and then the next cell after the time t 2 as the steady state, re-run
  • the process of S402 to S404 determines whether the battery has an internal short circuit.
  • the means for determining a short circuit within the battery in order to carry out the above-described functions, comprise corresponding hardware structures and/or software modules for performing the respective functions.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the embodiment of the present application may perform the division of the function module on the device for determining the short circuit in the battery according to the above method example.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 7 shows a possible structural diagram of the apparatus for determining the short circuit in the battery involved in the above embodiment.
  • the means 70 for determining a short circuit within the battery may include a voltage measuring unit 701, a calculation and processing unit 702, and a current integral measuring unit 703.
  • the voltage measuring unit 701, the calculating and processing unit 702, and the current integral measuring unit 703 acquiring unit 601 for supporting the determining of the short circuit in the battery performs the processes S401, S402 in FIG. 4 or FIG. 4a or FIG. 6;
  • calculating and processing Unit 70 is operative to support apparatus 70 for determining a short circuit within the battery to perform processes S403 and S404 of FIG. 4 or FIG. 4a or FIG. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.
  • Figure 8 illustrates an architecture for determining the connection of device 70 to a battery within a battery.
  • the operation of the apparatus 70 for determining a short circuit within the battery is described in conjunction with FIG.
  • one end of the voltage measuring unit 701 is connected to the battery for measuring the open circuit voltage of the battery, and the other end is connected to the calculation and processing unit 702 to transmit the measured open circuit voltage of the battery to the calculation and processing unit 702.
  • One end of the current integration measuring unit 703 is connected to one pole of the battery (which may be any pole of the battery, the anode in FIG. 8 is not limited) for measuring the current integration flowing through the battery, and the other end is connected to the calculation and processing unit.
  • the calculation and processing unit 702 performs the method of determining the internal short circuit of the battery described in the method embodiment of the present application according to the parameters transmitted by the voltage measuring unit 701 and the current integral measuring unit 703. The specific process has been described in detail in the foregoing method embodiments, and details are not described herein.
  • the voltage measuring unit 701 can measure the open circuit voltage of the battery by connecting the two poles of the battery.
  • the voltage measuring unit 701 can be connected to any pole of the battery, and the other battery of the default battery is grounded.
  • the negative electrode of the battery is omitted as a grounding drawing.
  • the current integration measurement unit 703 in the device 70 for determining the short circuit in the battery may specifically include a current measurement module 7031 and an integration module 7032.
  • the current measurement module 7031 is used to measure the current flowing through the battery;
  • the integration module 7032 is used to accumulate the current measured by the current measuring module as a current integral.
  • the current measurement module 7031 and the integration module 7032 support the current integration measurement unit 703 to perform its function.
  • the device 70 for determining the short circuit in the battery may further include a temperature measuring unit 704 for measuring the temperature of the battery at each time when the voltage measuring unit 701 measures the open circuit voltage of the battery.
  • the temperature measuring unit 704 can support the device 70 for determining a short circuit within the battery to perform step S401a or S402a in FIG. 4a or 6.
  • the voltage measuring unit 701 can implement measurement by using an ADC;
  • the current integration measuring unit 703 can be implemented by a resistor, an ADC, and an integrating circuit, wherein the resistor is connected in series to the positive or negative pole of the battery, and the other end of the resistor is connected to the load through the ADC.
  • the voltage across the resistor is measured to calculate the current flowing through the battery, and the integrated current is used to obtain the amount of electricity.
  • Computing and processing unit 702 can be a processor or controller.
  • it can be a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof.
  • the temperature measuring unit 704 can be implemented by a temperature sensor, which can include a temperature sensitive resistor or a thermocouple, and an auxiliary circuit of a temperature sensitive resistor or a thermocouple.
  • the integration circuit described in the embodiment of the present application may be a coulomb meter or an accumulator.
  • the voltage measuring unit 701 is an ADC
  • the current integral measuring unit 703 is a resistor, an ADC, and a coulomb counter
  • the temperature measuring unit 704 is a temperature sensor
  • the computing and processing unit 702 is a CPU
  • FIG. 12 shows a possible structural diagram of the apparatus for determining a short circuit in the battery involved in the above embodiment.
  • the device 120 for determining a short circuit in the battery may include a processing module 1201 and an acquisition module 1202.
  • the processing module 1201 is for controlling the operation of the device 120 that determines the short circuit in the battery.
  • the processing module 1201 is configured to support the determination of all of the processes in FIG. 4 or FIG. 4a or FIG.
  • the processing module 1201 controls the acquisition module 1202 to collect parameters of the battery.
  • the device 120 for determining a short circuit within the battery may further include a storage module 1203 for storing program codes and data of the device 120 for determining a short circuit within the battery.
  • the processing module 1201 may be the processor 201 in the physical structure of the device 20 for determining the short circuit in the battery shown in FIG. 2, and may be a processor or a controller.
  • it can be a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • Processor 1201 may also be a combination of computing functions, such as one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the acquisition module 1202 can be the collector 203 in the physical structure of the device 20 that determines the short circuit within the battery shown in FIG.
  • the acquisition module 1203 can be at least one of a temperature sensor, an ADC, and an integration circuit.
  • the storage module 1203 may be the memory 202 in the physical structure of the device 20 that determines the short circuit within the battery shown in FIG. 2.
  • the processing module 1201 is a processor
  • the collection module 1202 is a collector
  • the storage module 1203 is In the case of the memory
  • the device 120 for determining the short circuit in the battery according to FIG. 12 of the embodiment of the present application may be the device 20 for determining the short circuit in the battery shown in FIG. 2.
  • the apparatus for determining the short circuit in the battery provided by the embodiment of the present application may be used to implement the method implemented in the foregoing embodiments of the present application.
  • the parts related to the embodiment of the present application are shown, and the specific technical details are not provided.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in RAM, flash memory, ROM, Erasable Programmable ROM (EPROM), and electrically erasable programmable read only memory (Electrically EPROM).
  • EEPROM electrically erasable programmable read only memory
  • registers hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated in one processing unit. It is also possible that each unit is physically included separately, or two or more units may be integrated in one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

La présente invention concerne, selon un mode de réalisation, le domaine de l'électronique et un procédé et un dispositif destinés à être utilisés lors de la détermination d'un court-circuit interne d'une batterie, lesquels peuvent déterminer de manière précise et rapide un court-circuit interne d'une batterie dans diverses circonstances. La solution fournie par le mode de réalisation de la présente invention comprend : la mesure de la tension de circuit ouvert OCV1 et de la température de batterie d'une batterie au temps t1, l'obtention d'une capacité restante QOCV1 de la batterie qui correspond à l'OCV1 à la température de batterie mesurée dans une relation de correspondance prédéfinie, et l'enregistrement d'une intégrale QCC1 d'un courant qui circule à travers la batterie à partir d'un temps où le système auquel la batterie appartient est alimenté jusqu'au temps t1; la mesure de la tension de circuit ouvert OCV2 et de la température de batterie de la batterie au temps t2, l'obtention d'une capacité restante QOCV2 de la batterie qui correspond à l'OCV2 à la température de batterie mesurée dans la relation de correspondance prédéfinie, et l'enregistrement d'une intégrale QCC2 d'un courant qui circule à travers la batterie à partir d'un temps où le système auquel la batterie appartient est alimenté jusqu'au temps t2; le calcul d'un courant de court-circuit interne IISC de la batterie, et si l'IISC calculé est supérieur ou égal à un seuil prédéfini, alors la détermination du fait que la batterie a été mise en court-circuit interne. La présente invention est utilisée pour déterminer si un court-circuit interne s'est produit dans une batterie.
PCT/CN2017/088280 2017-04-26 2017-06-14 Procédé et dispositif destinés à être utilisés lors de la détermination d'un court-circuit interne d'une batterie WO2018196121A1 (fr)

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