Device and method for testing health state of battery

Abstract

The invention relates to a device and a method for testing health state of a battery, wherein the device comprises a main control module and the following modules that are connected with the main control module: an input module, a discharging load module, a voltage/current/temperature signal collecting module and an output module. The method comprises the steps of correcting CCA (Common Communication Adapter) and calculating the reference internal resistance R0 of the tested battery according to the testing standard, the battery type and the environmental temperature; measuring the voltage change rate DV and the current change rate DI of the measured battery by conducting and disconnecting the discharging load (recovered); calculating the practical dynamic battery resistance R which is equal to DV/DI; calculating the state of charge of battery SOH that is equal to (R-R0)/R0; and outputting the testing result or corresponding testing prompt of the health state according to the battery voltage V and SOH. According to strict verification of discharge test, the estimation precision of the testing device and the testing method can achieve within 5%, can be repeatedly tested, do not need strict conditions, have high automation degree, and can meet the practical maintenance requirements of the battery.

Description

technical field [0001] The invention relates to battery maintenance, in particular to a battery state of health SOH (STATE OF HEALTH) and state of charge SOC (state of charge) testing device and method thereof. Background technique [0002] Existing batteries will gradually age with the increase of use time. The aging reasons are the surface vulcanization and corrosion of the battery plates, and the shedding of active materials. This is the main reason why most batteries cannot continue to provide energy. The purpose of battery state of health and state of charge test is to judge the surface condition of the battery plate and the ability of chemical reaction through the test of the dynamic internal resistance of the battery and the test of the starting battery, to infer the capacity of the battery and the capacity of the battery. The power loss situation provides a basis for battery maintenance, including the following standards: [0003] (1) The International Electrotechni...

AI Technical Summary

Problems solved by technology

[0022] Since the battery manufacturer does not give the reference value of the internal resistance of the battery at room temperature, it is impossible to directly use the IEEE1118-2005 standard for judging the health status of the battery, which is not practical for starting batteries

[0023] At present, the test devices for these test methods are simple or there is no corresponding automatic test device or such a device is disclosed, and it cannot be corrected according to the battery type and ambient temperature, and the accuracy is low

For method 3, it mainly belongs to the laboratory method, but its application to actual battery maintenance has serious limitations and is not accurate, and it is difficult to meet the needs of actual battery maintenance

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