Method and system for equalizing electric quantity of single batteries

Abstract

The invention provides a method and a system for equalizing the electric quantity of single batteries, wherein the system comprises a signal acquisition module, a remained electric quantity calculation module, a control module, a two-way isolation direct current conversion circuit and a switch matrix. The signal acquisition module is used for acquiring the performance parameter information of all single batteries in a battery pack; the remained electric quantity calculation module is used for acquiring the remained electric quantity of all single batteries in the battery pack; the control module is used for determining and controlling the switch matrix to select the single batteries required to be subjected to electric quantity equalization according to the remained electric quantity of all single batteries in the battery pack, and transmits the instruction of charging or discharging the selected single batteries required to be subjected to the electric quantity equalization to the direct current isolation transform circuit; and the two-way direct current isolation transform circuit is used for charging or discharging the selected single batteries required to be subjected to the electric quantity equalization according to the instruction transmitted by the control module. By the technical scheme provided by the invention, the problem of inconsistent performance among single batteries in the battery pack can be effectively solved.

Description

technical field [0001] The invention relates to battery management technology, in particular to a method and system for equalizing the power of a single battery, belonging to the technical field of lithium batteries. Background technique [0002] With the development of power lithium battery technology and pure electric vehicle technology, lithium batteries have replaced traditional lead-acid batteries and nickel-metal hydride batteries as the core energy storage devices in pure electric vehicles. Since the voltage of a single lithium battery is only 3-4 volts, the power supply system of an electric vehicle usually needs to connect a large number of lithium batteries in series. In some cases, these lithium batteries are divided into multiple battery modules to be connected in series. For lithium batteries, or other types of rechargeable batteries, the individual batteries may have inconsistencies in capacity and internal resistance due to factors such as the manufacturing pr...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and system for balancing the power of a single battery, which are used to effectively solve the problem of inconsistent performance among the single batteries in a battery pack

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