CN203037827U - Storage battery power fast metering device - Google Patents

Abstract

The utility model belongs to the technical field of storage battery measurement, and in particular relates to a storage battery power fast metering device. A host computer carries out communication with a single chip microcomputer minimum system through an RS-485 serial port, so as to control the single chip microcomputer to work and to receive a signal transmitted by the single chip microcomputer. A temperature detection circuit is connected with an input port of the single chip microcomputer. A voltage detection circuit and a current detection circuit are connected with A/D conversion ports of the single chip microcomputer. A timing circuit is connected with the single chip microcomputer and provides the working time and the standing time of a battery for the single chip microcomputer. After the single chip microcomputer completes operation, a result is displayed on a display and is transmitted to the host computer at the same time. According to the utility model, temperature and the impact of battery self-discharge on power metering and charging state estimation are comprehensively considered, and the storage battery power fast metering device has the advantages of fast operation speed, strong signal processing ability, simple structure and low cost, and is especially suitable for engineering application.

Description

A fast metering device for battery power

technical field

The utility model belongs to the technical field of storage battery measurement, in particular to a fast measuring device for storage battery power.

Background technique

The state of charge is the ratio of the remaining capacity of the battery to the capacity of the fully charged state, and is an important parameter reflecting the energy of the battery. Due to the complex dynamic characteristics of the battery under different working conditions, how to accurately measure the power of the battery has become a big problem, and the management of charging and discharging of the battery not only affects the efficiency of the power battery, but also affects the service life of the battery. Therefore, the power of the battery Metering and state-of-charge sensing are critical.

Utility model content

The utility model provides a fast metering device for accumulator electric quantity considering the battery temperature and the self-discharge effect.

The technical scheme of the utility model is:

The controller includes a host computer, a minimum system of a single-chip microcomputer, a timing circuit and a detection circuit, wherein the detection circuit includes voltage detection, current detection and temperature detection.

The connection relationship of each part is:

The upper computer communicates with the minimum system of the single-chip microcomputer through the RS-485 serial port, controls the work of the single-chip microcomputer and receives the signal transmitted by the single-chip microcomputer. The temperature detection circuit is connected to the input interface of the single-chip microcomputer, and the voltage detection circuit and the current detection circuit are connected to the A/D conversion port of the single-chip microcomputer. The timing circuit is connected with the single-chip microcomputer to provide the working time and the resting time of the battery to the single-chip microcomputer. After the single-chip microcomputer completes the operation, the result is displayed on the display screen and transmitted to the host computer at the same time.

The upper computer is a Labview program running on the PC platform, and the upper computer can send instructions to the minimum system of the single-chip microcomputer through the RS-485 serial port, and the single-chip computer can send the calculation results of the current metering device to the upper computer for real-time display.

The minimum system of the single-chip microcomputer adopts a DSP processor TMS320F2407, and its minimum system circuit includes a display screen, a reset circuit, an ISP download line interface circuit, and the like.

The timing circuit adopts PCF8583 and a battery that supplies power to it separately.

The detection circuit includes voltage detection, current detection and temperature detection. The voltage detection adopts the floating method and is directly connected to the A/D conversion pin of the single-chip microcomputer. The current detection adopts a detection circuit composed of MAX472, and the temperature detection is realized by a single-bus digital temperature sensor DS18B20.

The beneficial effects of the utility model are:

The metering device comprehensively considers the influence of temperature and battery self-discharge on power metering and state of charge estimation, has fast calculation speed, strong signal processing capability, simple structure and low cost, and is very suitable for engineering applications.

Description of drawings

Fig. 1 is the structural block diagram of described metering device;

Fig. 2 is a working principle diagram of the metering device.

Detailed ways

The utility model provides a fast metering device for storage battery power. The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

Figure 1 shows the structure diagram of each module of the entire controller, including the upper computer, the minimum system of the single-chip microcomputer, the timing circuit and the detection circuit, and the detection circuit includes voltage detection, current detection and temperature detection.

The voltage detection uses the floating ground method to detect the terminal voltage signal of the storage battery, and after proper signal conditioning, it is connected to the A/D conversion port of the single-chip microcomputer through photoelectric isolation. The current detection is realized by MAX472, which detects the current size during the charging and discharging process of the battery, and is connected to the A/D conversion port of the single-chip microcomputer after signal conditioning. DS18B20 is used for temperature detection, and the measurement result is a digital signal, which is connected to the input port of the single-chip microcomputer through serial input. The timing circuit is connected to the input port of the microcontroller through the serial input. The single-chip computer calculates the state of charge according to the measurement results, and the calculation results are sent to the host computer for further processing.

Figure 2 shows the working principle diagram of the metering device. After starting to work, the device is initialized, the initial value is set, and after the communication initialization is completed, it waits for the host computer to send a detection command. After the single-chip microcomputer receives the detection command sent by the host computer, it starts to collect the temperature signal, voltage and current signal of the battery, as well as the charging and discharging time or resting time of the battery, and starts to calculate the state of charge of the battery. Firstly, the capacity deviation caused by battery self-discharge is compensated according to the resting time of the battery, and then the state of charge is calculated by the ampere-hour method according to the current and charge-discharge time, and then correspondingly compensated according to the battery temperature. The calculated results are displayed on the display screen by the single-chip microcomputer and sent to the host computer for processing from time to time.

Claims (4)

1. accumulator electric-quantity quick metering device is characterized in that: comprise host computer, and single-chip minimum system, timing circuit and testing circuit, wherein testing circuit comprises voltage detecting, current detecting and temperature detection;

The annexation of each several part is: host computer is communicated by letter with single-chip minimum system by the RS-485 serial ports, and control single chip computer work is also accepted the signal that single-chip microcomputer transmits; Temperature sensing circuit is connected to the input interface of single-chip microcomputer, and voltage detecting circuit and current detection circuit are connected to the A/D conversion port of single-chip microcomputer; Timing circuit links to each other with single-chip microcomputer, and working time and the time of repose of battery is provided to single-chip microcomputer; Single-chip microcomputer is presented at the result on the display screen after finishing computing, is sent to host computer simultaneously.

Described single-chip minimum system adopts dsp processor TMS320F2407, and its minimum system circuit comprises that display screen, reset circuit, ISP download the line interface circuit;

Described timing circuit adopts PCF8583 and independent battery to its power supply;

Testing circuit comprises voltage detecting, current detecting and temperature detection.

2. a kind of accumulator electric-quantity quick metering device according to claim 1 is characterized in that: single-chip minimum system employing dsp processor TMS320F2407.

3. a kind of accumulator electric-quantity quick metering device according to claim 1 is characterized in that: timing circuit employing PCF8583.

4. a kind of accumulator electric-quantity quick metering device according to claim 1 is characterized in that: temperature detection employing 1-wire digital temperature sensor DS18B20 realization.

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