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Equalization control method of lithium battery pack based on charge difference as equalization criterion

A technology of equalization control and lithium battery packs, which is applied in charge equalization circuits, battery/fuel cell control devices, secondary batteries, etc., and can solve problems such as fires in battery packs, threats to the life safety of users, and impact on the use time of electrical devices

Active Publication Date: 2020-01-24
HENAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Due to the uneven manufacturing process and operating environment, there are inconsistencies in capacity, internal resistance, and temperature in series lithium-ion battery packs
This not only leads to low capacity utilization of the lithium battery pack, which affects the service life of the electric device, but also causes overcharging or overdischarging of the lithium battery pack, which leads to a decrease in the service life of the lithium battery pack, which leads to an increase in the cost of the electric device, and even causes Some safety issues such as battery pack fires threaten the lives of users

Method used

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  • Equalization control method of lithium battery pack based on charge difference as equalization criterion
  • Equalization control method of lithium battery pack based on charge difference as equalization criterion
  • Equalization control method of lithium battery pack based on charge difference as equalization criterion

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Embodiment Construction

[0049] A lithium battery pack equalization control method using charge difference as an equalization criterion includes the following steps:

[0050] 1. Construct a balanced topological circuit: Different control strategies are inseparable from the corresponding balanced circuit. The active balanced control strategy proposed by the present invention is based on a bidirectional energy flow topology circuit with an inductor as an energy storage element. The bidirectional energy flow is the battery can Transfer energy to the inductance, and the inductance can also transfer energy to the battery. The circuit includes a β battery unit group, β>1, and each layer of battery unit groups is connected in series. Each layer of battery unit groups includes n single battery packs ,Such as figure 1 As shown, Batn1-Batn4 represent each single battery, for example, each single battery of the first battery pack is Bat11-Bat14, each single battery is connected in series, Indicates each single...

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Abstract

The invention provides an equalization control method of a lithium battery pack based on the charge difference as equalization criterion. According to the method, firstly the difference value of eachadjacent battery pack and the difference value of each battery pack in each battery pack are sorted in a descending order. As for different combination states, the system sends out different control signals to control the on-off of the corresponding field effect transistor (Mosfet) in the equalization circuit so as to realize the redistribution of the charge amount of each battery. When the difference value of each adjacent battery pack is within the threshold allowable range, it means that the betath layer equalization is completed, and when the difference value between the adjacent battery packs in each cell pack is within the threshold allowable range, it means that the charge amount equalization of the whole series lithium battery pack is completed. The equalization control technologycan more quickly and accurately reduce the inconsistency of the charge amount between the batteries, effectively prevent overcharge or overdischarge of the series lithium battery pack and effectivelyprolong the service life of the series lithium battery pack.

Description

technical field [0001] The invention belongs to the technical field of battery pack energy storage, and relates to a lithium battery pack equalization control method using the charge amount difference as an equalization criterion. Background technique [0002] Due to the uneven manufacturing process and operating environment, there are inconsistencies in capacity, internal resistance, and temperature in series lithium-ion battery packs. This not only leads to low capacity utilization of the lithium battery pack, which affects the service life of the electric device, but also causes overcharging or overdischarging of the lithium battery pack, which leads to a decrease in the service life of the lithium battery pack, which leads to an increase in the cost of the electric device, and even causes Some safety issues such as battery pack fire threaten the lives of users. Therefore, it is necessary to study the equalization technology of lithium battery packs to make full use of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44B60L58/22
CPCH02J7/0019H01M10/441B60L58/22Y02T10/70Y02E60/10
Inventor 杨宗霄蔡大明贾亚飞熊运霞宋珍珍李攀攀程美明陈敬云
Owner HENAN UNIV OF SCI & TECH
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