Determining method for equalizing current value matched with power battery system

Abstract

The invention provides a determining method for equalizing current value matched with a power battery system. The determining method comprises determination of a minimum value of the equalizing current value and determination of a maximum value of the equalizing current value, wherein the minimum value of the equalizing current value is determined according to the self-discharge capacity of the battery; the maximum value of the equalizing current value is based on the criterion that the influence on sampling accuracy of a sampling module is within an allowed range. The determining method for the equalizing current value obtains the equalizing current value satisfying the characteristic of the power battery system through the reasonable calculation method on the collected data; the minimum value and the maximum value of the equalizing current value are accurately determined; data and theory support for the power battery system in controlling the equalizing current are provided; and the demand of rapidly improving the consistency of the battery pack through the equalizing function is met, and meanwhile, the battery system can be well maintained, so that the validity and long lasting of the equalizing function are fully ensured.

Description

technical field [0001] The invention relates to a method for determining an equalizing current of a battery charging equalizing module, in particular to a method for determining an equalizing current value matched with a power battery system. Background technique [0002] During the battery charging process of electric vehicles, due to the inconsistency of each battery cell in the battery pack, it is necessary to use a balancing module to charge the battery in a balanced manner. However, the current control of the balanced current for balanced charging is not standardized. Many customers require The larger the equalization current, the better, but in fact, the larger the equalization current, the more difficult it is to realize the circuit. At the same time, if the control strategy is not good, it is easy to cause the battery to be over-discharged, which will cause great losses to both customers and manufacturers. Therefore, for different power It is an important research to...

AI Technical Summary

Problems solved by technology

[0002] During the battery charging process of electric vehicles, due to the inconsistency of each battery cell in the battery pack, it is necessary to use a balancing module to charge the battery in a balanced manner. However, the current control of the balanced current for balanced charging is not standardized. Many customers require The larger the equalization current, the better, but in fact, the larger the equalization current, the more difficult it is to realize the circuit. At the same time, if the control strategy is not good, it is easy to cause the battery to be over-discharged, which will cause great losses to both customers and manufacturers. Therefore, for different power It is an important research topic at present to choose the appropriate balance current for the battery system