CN-115248387-B - Method and device for testing battery equalization function

CN115248387BCN 115248387 BCN115248387 BCN 115248387BCN-115248387-B

Abstract

The application discloses a method and a device for testing a battery balancing function, which relate to the technical field of battery testing, wherein the device for testing the battery balancing function comprises a battery charging and discharging module for performing charging and discharging cycle test, and the BMS equalization circuit is connected with the battery charge and discharge module, and the Hall acquisition circuit is connected with the BMS equalization circuit until a preset condition for starting a battery equalization function is reached in the test process. The method has the advantages that the electromagnetic characteristic of the Hall sensor is adopted, the balancing current value of the battery module in the charging and discharging process and the size and the balancing time of the balancing current are indirectly obtained by penetrating the Hall sensor through the voltage acquisition wire harness on the basis of not damaging the BMS balancing circuit, and the technical scheme of the method does not increase the internal resistance value of an original circuit, has small influence on the acquisition of micro-current and can truly reflect the current value in the circuit as a main judging index of the battery balancing function.

Inventors

WANG QINGWEI
YU XIAOPING
CHEN WEI
LUAN JIAN
ZHANG FEI

Assignees

浙江南都电源动力股份有限公司
杭州南都动力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20220614

Claims (8)

1. A test device for a battery equalization function, comprising: the battery charge-discharge module is used for performing charge-discharge cyclic test until a preset condition for starting a battery equalization function is reached in the test process; The BMS equalization circuit is connected with the battery charging and discharging module and is used for collecting basic data in the testing process and realizing energy transfer or energy dissipation between the single battery cells so as to generate current; The Hall acquisition circuit is connected with the BMS equalization circuit and is used for acquiring the change time of an analog signal and calculating the magnitude of an equalization current based on the BMS equalization circuit and judging the quality of a battery equalization function based on the change time of the analog signal and the magnitude of the equalization current; The Hall acquisition circuit comprises a Hall sensor, a Hall power supply system and a Hall output acquisition system, wherein the Hall sensor is respectively connected with the Hall power supply system and the Hall output acquisition system; the Hall output acquisition system is used for converting and recording analog signals output by the Hall sensor, visualizing and storing the analog signals of the Hall sensor for a long time and providing data for acquiring the duration time of the balanced current and the value of the balanced current; the device adopts a test method of a battery equalization function, and comprises the following steps: setting a charging and discharging flow of a charging and discharging motor based on parameter information of a battery module, and performing charging and discharging cyclic test on the battery module based on the charging and discharging flow until a preset condition for starting a battery balancing function is reached in the test process; after the battery balancing function is started, the BMS balancing circuit generates current, and the charge-discharge cycle test specifically comprises the following steps: Step S1, the charging and discharging motor discharges the battery module with rated power of 1.3KW, and when the total voltage of the battery module is 40V or the single battery cell is 22.5V, the battery module stops discharging; S2, standing for 30min; Step S3, the charging and discharging machine charges the battery module with rated power of 1.3KW, and when the total voltage of the battery module is 58.4V or the single battery cell is 23.65V, the battery module stops charging; S4, standing for 30min; step S5, the charging and discharging motor discharges the battery module with rated power of 1.3KW, and when the total voltage of the battery module is 40V or the single battery cell is 22.5V, the battery module stops discharging; and (3) repeating the steps S2 to S5 for 3 times, ending the charge and discharge flow of the battery module, and recording and storing related charge and discharge data.
2. The device for testing a battery balancing function according to claim 1, wherein the battery charging and discharging module comprises a charging and discharging machine and a battery main control box, the charging and discharging machine is connected with the battery main control box, the charging and discharging machine is used for presetting a plurality of charging and discharging modes, and the battery main control box is used for protecting the battery module.
3. The device for testing a battery balancing function according to claim 1, wherein the BMS balancing circuit comprises a battery module and a battery management system, the battery module is connected with the battery management system, the battery module is used for storing electric energy, and the battery management system is used for collecting basic data in a testing process.
4. The device for testing a battery balancing function according to claim 3, wherein the battery module comprises a plurality of single cells, a plurality of voltage acquisition harnesses and a plurality of welded aluminum rows, and the welded aluminum rows are respectively connected with the single cells and the voltage acquisition harnesses.
5. The battery equalization function test device of claim 1, wherein said hall power supply system comprises a hall power supply circuit and a dc power supply, said dc power supply being connected to said hall power supply circuit, said hall power supply circuit being connected to said hall sensor.
6. The device for testing the balance function of the battery according to claim 1, wherein the hall output acquisition system comprises a hall signal acquisition line and a paperless recorder, the paperless recorder and the hall signal acquisition line, and the hall signal acquisition line is connected with the hall sensor.
7. An electronic device comprising a memory and a processor, the memory configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement a method of testing a battery equalization function as recited in claim 1.
8. A readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the method as claimed in claim 1.

Description

Method and device for testing battery equalization function Technical Field The application belongs to the technical field of battery testing, and particularly relates to a method and a device for testing a battery balancing function. Background The existing BMS claims to have active equalization or passive equalization functions, and equalization current can reach 3A level or even higher, so that the consistency of the system can be improved. However, according to the result of the existing project operation data feedback, the equalization function does not play a corresponding role. The lithium battery integrated manufacturer needs a circuit for intuitively judging the battery equalization function effect and is used for rapidly verifying the merits of the battery equalization function. The equalization method is that two means of energy transfer or energy dissipation are realized between the battery core monomers of the lithium battery through an equalization circuit, and the most basic performance is current. The magnitude of the current value and the duration of the current value can be used as important judging conditions for the quality of the battery balancing function. At present, the current value in an equalizing circuit is obtained by a few effective means and test methods in the industry, and the conventional current detection mode is to connect an ammeter in series in the equalizing circuit to directly collect the equalizing current value. The method for acquiring the balanced current value by adopting the series ammeter increases the internal resistance value of the original circuit, has larger acquisition influence on micro-current and can not truly reflect the current value in the circuit Disclosure of Invention The application aims to provide a method and a device for testing a battery balancing function, which are used for solving the technical problem that the current value in a circuit cannot be truly reflected in the prior art. In order to achieve the technical purpose, the application adopts the following technical scheme: a test device for battery equalization function, comprising: the battery charge-discharge module is used for performing charge-discharge cyclic test until a preset condition for starting a battery equalization function is reached in the test process; The BMS equalization circuit is connected with the battery charging and discharging module and is used for collecting basic data in the testing process and realizing energy transfer or energy dissipation between the single battery cells so as to generate current; the battery balancing device comprises a Hall acquisition circuit, wherein the Hall acquisition circuit is connected with the BMS balancing circuit and is used for acquiring the change time of an analog signal and calculating the magnitude of balancing current based on the BMS balancing circuit, and judging the goodness of a battery balancing function based on the change time of the analog signal and the magnitude of the balancing current. Preferably, the battery charging and discharging module comprises a charging and discharging machine and a battery main control box, the charging and discharging machine is connected with the battery main control box, the charging and discharging machine is used for presetting various charging and discharging modes, and the battery main control box is used for protecting the battery module. Preferably, the BMS balancing circuit includes a battery module and a battery management system, the battery module is connected with the battery management system, the battery module is used for storing electric energy, and the battery management system is used for collecting basic data in a test process. Preferably, the battery module comprises a plurality of single cells, a plurality of voltage acquisition wire harnesses and a plurality of welded aluminum rows, wherein the welded aluminum rows are respectively connected with the single cells and the voltage acquisition wire harnesses. Preferably, the hall acquisition circuit comprises a hall sensor, a hall power supply system and a hall output acquisition system, wherein the hall sensor is respectively connected with the hall power supply system and the hall output acquisition system. Preferably, the hall power supply system comprises a hall power supply circuit and a direct current power supply, wherein the direct current power supply is connected with the hall power supply circuit, and the hall power supply circuit is connected with the hall sensor. Preferably, the hall output acquisition system comprises a hall signal acquisition line and a paperless recorder, wherein the paperless recorder is connected with the hall signal acquisition line, and the hall signal acquisition line is connected with the hall sensor. A testing method of battery equalization function comprises the following steps: setting a charging and discharging flow of a charging and discharging motor based on paramete