Balancing device for battery pack

Abstract

The invention discloses a balancing device for a battery pack. The battery pack comprises a plurality of single batteries connected in series, wherein the balancing device comprises a voltage acquisition module, a current acquisition module, a master control module, a charge balancing circuit and a discharge balancing circuit; the voltage acquisition module is used for detecting single voltage ofthe battery pack; the current acquisition module is used for detecting the magnitudes and directions of charge and discharge current; the master control module is used for computing the mean voltage of the battery pack, determining the charge and discharge conditions of the battery pack, outputting a charge balancing signal during charging if the single voltage exceeding a limit value exists in the battery pack, and outputting a discharge balancing signal during discharging in a static state if the single voltage which is decreased exists in the battery pack; the charge balancing circuit is used for carrying out charge balancing on the corresponding single battery according to the charge balancing signal; and the discharge balancing circuit is used for carrying out discharge balancing on the corresponding single battery according to the discharge balancing signal. Therefore, the condition that the stability is affected by the consistency problem of the single batteries is effectively avoided.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, and more specifically, relates to a balancing device for a battery pack. Background technique [0002] The battery device is the core component of the electric vehicle, which provides the energy used for driving the electric vehicle. The battery device is generally connected in series and parallel with smaller battery cells to provide the required voltage and power for the electric vehicle. load. Due to the raw materials, process and other reasons in the production process of battery cells, there will inevitably be differences between batches or between battery cells in the same batch, mainly reflected in the voltage and capacity between battery cells, that is, battery There are generally problems with the consistency of monomers. A battery device is generally composed of several battery packs, and each battery pack includes a certain number of battery cells. The consistency...

AI Technical Summary

Problems solved by technology

A battery device is generally composed of several battery packs, and each battery pack will include a certain number of battery cells. The consistency problem of these battery cells will lead to a decrease in the working performance of the battery pack, thereby affecting the stability of the battery device.

In order to ensure the working stability of the battery device, the battery device needs to be able to balance the battery cells, otherwise it will lead to poor working stability, which will endanger the safe operation of electric vehicles

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