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Method and circuit for cascade compensation balancing of battery pack

A series compensation and equalization method technology, applied in the direction of secondary battery repair/maintenance, etc., can solve the problems of excessive energy loss and unsuitable application occasions, and achieve the effects of prolonging service life, easy expansion, and suppressing overcharge and overdischarge

Active Publication Date: 2011-08-10
HANGZHOU GOLD ELECTRONICS EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of this equalization circuit are low cost, simple, and easy to implement, but the disadvantage is excessive energy loss, which is obviously not suitable for high-capacity, high-voltage power battery applications

Method used

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  • Method and circuit for cascade compensation balancing of battery pack
  • Method and circuit for cascade compensation balancing of battery pack
  • Method and circuit for cascade compensation balancing of battery pack

Examples

Experimental program
Comparison scheme
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Embodiment

[0019] refer to Figure 2-4 In this embodiment, a battery pack composed of 6 lithium iron phosphate batteries is used, and a battery unit is taken as an example. The circuit of the present invention is used to realize the series compensation balance of the battery pack. The circuit of this embodiment includes a controller, a constant current source, several trunk switches and branch switches. The constant current source, the trunk switch and the branch switch They are respectively connected to the controller, several main circuit switches are connected in series to the constant current source, and both ends of each main circuit switch are respectively connected in parallel with the battery unit through the branch circuit switch. The branch switches are K11, K21, K31, K41, K51, K61 and K7, the trunk switches are K12, K22, K32, K42, K52 and K62, and the trunk switches K12, K22, K32, K42, K52 and K62 After being connected in series, they are respectively connected to both ends o...

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Abstract

The invention relates to a method and a circuit for cascade compensation balancing of a battery pack, and the balancing method comprises acquisition of information of the battery pack, processing of the acquired information and implementation of balancing of the battery pack, wherein the implementation of the balancing of the battery pack is as follows: a controller is used for on-off control of a corresponding actuator so as to connect one or more continuous battery units which need to be balanced with a constant current source in series for forming a loop; and the balancing circuit comprises the controller, the constant current source and a plurality of trunk switches and branch switches, wherein the constant current source, the trunk switches and the branch switches are connected with the controller respectively, the plurality of the trunk switches are connected in series and then connected with the constant current source, and two ends of each trunk switch are connected with the battery units through the branch switches in parallel respectively. By adopting the method and the circuit, cascade compensation type balancing can be performed on any one or the plurality of the continuous battery units with lower voltage or smaller capacity in the battery pack, the balancing method for the battery pack is low in cost, non-destructive and active, and the balancing circuit is simple and easy to expand simultaneously.

Description

technical field [0001] The invention relates to a series compensation and equalization method and circuit of a battery pack, in particular to a compensating equalization method and circuit applied to each battery voltage or battery capacity in a battery pack. Background technique [0002] In applications such as energy storage power stations and electric vehicles, it is necessary to use series battery packs to meet the needs of high voltage and high capacity. Due to the production process and other reasons of the single battery, the capacity and performance of each battery are different. In the process of charging and discharging the battery pack, this difference will inevitably be enlarged; when charging, the battery with small capacity and poor performance will be overcharged. , and when discharging, the battery with small capacity and poor performance will be over-discharged, which will accelerate the damage of the battery in the long run. Therefore, it is the consensus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCY02E60/12Y02E60/10
Inventor 陈春飞王浩徐剑虹
Owner HANGZHOU GOLD ELECTRONICS EQUIP CO LTD
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