Battery management method and system

Abstract

The invention discloses a battery management method and system applied to a battery management chip. The system comprises a battery module, a maximum determining circuit, a minimum determining circuit and a balance module, wherein the battery module comprises a first battery to an Nth battery; N is an integer not smaller than 2; the maximum determining circuit is used for obtaining first voltage to Nth voltage, which correspond to the first battery to the Nth battery one by one and determining maximum voltage from the first voltage to the Nth voltage to be the maximum voltage; the minimum determining circuit is used for obtaining the first voltage to the Nth voltage, which correspond to the first battery to the Nth battery one by one and determining minimum voltage from the first voltage to the Nth voltage to be the minimum voltage; and the balance module is used for balancing voltage corresponding to the maximum voltage when the minimum voltage is greater than a balance start threshold and a voltage difference between the maximum voltage and the minimum voltage is greater than a voltage difference threshold. The condition that multiple batteries are simultaneously balanced forcibly when the batteries do not need to be balanced is avoided and the balancing effect is relatively good.

Description

technical field [0001] The present invention relates to the technical field of battery management, and more specifically, to a battery management method and system. Background technique [0002] Commonly used lithium battery protection chips on the market, such as S8254 and S8204, usually do not have a balancing function, and need to add a dedicated balancing chip, such as HY2213, to achieve the balancing function; of course, there are also lithium battery protection chips integrated with balancing functions on the market, such as R5432 etc. [0003] The above schemes for realizing the equalization function have a common feature, specifically: when the voltage of each battery exceeds the equalization opening value, the corresponding battery is equalized, even if the voltage difference between the batteries is small enough. But in fact, when the voltage difference between the batteries is small enough, there is no need to equalize the voltage of the battery, but because the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a battery management method and system to solve the problems in the prior art for realizing battery equalization function due to severe heat generation during equalization, so it is impossible to set a larger equalization current, which eventually leads to poor equalization effect The problem

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