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Battery pack equalization method, device and system

An equalization method and equalization device technology, applied in battery circuit devices, circuit devices, charge equalization circuits, etc., can solve problems such as equalization circuit burnout, achieve the effects of increasing equalization time and improving equalization efficiency

Active Publication Date: 2022-05-03
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a battery pack balancing method, device and system, which can solve the problem of burning out of the balancing circuit caused by too high balancing current in the related art

Method used

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  • Battery pack equalization method, device and system
  • Battery pack equalization method, device and system
  • Battery pack equalization method, device and system

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Embodiment Construction

[0078] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0079] At present, with the rapid development of battery technology for electric vehicles and the popularization of charging piles, electric vehicles have entered ordinary households. However, the energy storage of electric vehicle batteries has always been a bottleneck in the development of electric vehicles. Due to the limitation of the production process, the performance parameters such as internal resistance, capacity and self-discharge rate of the single cells produced in the same batch are also different. It is becoming more and more significant, seriously affecting the life of the battery pack. Therefore, it is necessary to perform balanced management on the battery pack to keep the capacity of the single cells of the battery pack con...

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Abstract

The invention discloses a battery pack balancing method, device and system, and relates to the field of power batteries. The battery pack can be divided into multiple sub-battery packs. During the charging process of the battery pack, when it is detected that the battery pack satisfies the equilibrium condition, the charging process of the battery pack, the discharge process of the battery pack after charging, and the In at least one process of the next charging process of the battery pack, all or part of the N single cells to be balanced are balanced, and the balanced single cells included in each sub-battery group The quantity of is less than or equal to the quantity threshold. Therefore, during the balancing process of the battery pack, it is possible to avoid burning out of the balancing circuit due to too many single cells being balanced. Moreover, the method provided by the invention can balance the battery pack during the entire charging process and discharging process of the battery pack, effectively improving the equalization efficiency.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a battery pack balancing method, device and battery pack balancing system. Background technique [0002] During the use of electric vehicles, battery packs are required to provide energy for them. The battery pack generally includes multiple single cells, but the performance parameters such as internal resistance, capacity and self-discharge rate of the single cells produced in the same batch are different. The capacity difference between them will become more and more significant, which will seriously affect the life of the battery pack. Therefore, it is necessary to balance the battery pack during the charging and discharging process to reduce the capacity imbalance of the battery pack caused by the capacity difference of each single cell. [0003] In the related art, in order to balance the capacity of each single cell in the battery pack, each single cell in the battery pack ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 徐明沈红荣姜灏张世兵吴媛媛梁彦麾余雨汪卫
Owner CHERY AUTOMOBILE CO LTD
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