Equalization system of lithium ion battery and equalization method thereof

A lithium-ion battery and equalization system technology, which is applied in the field of lithium-ion battery equalization system and its equalization charging, can solve problems such as battery imbalance and permanent battery damage, and achieve the effect of prolonging the service life

Inactive Publication Date: 2012-05-02
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, when the battery pack is discharged with a large current for a period of time, it will cause the imbalance between the batteries to a certain extent, and the polarity of the battery with a small capacity will be reversed during use, resulting in battery failure. cause permanent damage

Method used

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  • Equalization system of lithium ion battery and equalization method thereof
  • Equalization system of lithium ion battery and equalization method thereof
  • Equalization system of lithium ion battery and equalization method thereof

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Embodiment Construction

[0027] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0028] figure 1 A schematic diagram of a balancing system for a Li-ion battery. like figure 1 As shown, the balanced charging system for lithium-ion batteries provided by the example of the present invention includes a battery module, an acquisition control module and a balanced control module. The collection control module is used to collect the actual voltage value of each single battery, the current value of the battery module and the actual temperature, calculate the SOC of each single battery according to the collected voltage value, temperature and current value, and calculate the SOC of each single battery according to the calculated battery The actual SOC is compared with a given SOC range to identify unbalanced cells. The balance control module receives the number of the sing...

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Abstract

The invention relates to an equalization system of a lithium ion battery and an equalization method thereof. The equalization system comprises a battery module, a sampling control module, and an equalization control module, wherein the battery module is formed by 12 battery strings. The sampling control module is used for collecting voltage values of all single batteries in the battery module and a temperature value of the battery module as well as carrying out sampling on currents. According to the collection result, a to-be-equalized single battery group is determined; the to-be-equalized single battery group comprises a single battery in the battery module or comprises two or over two adjacent single batteries. And the equalization control module is used for controlling the to-be-equalized single battery group to carry out charging or discharging. According to the provided equalization method in the invention, even if multi-time charging and discharging are carried out, an occurrence of a non-equalized phenomenon between batteries can be reduced, thereby improving the battery module performance and prolonging the battery service life.

Description

technical field [0001] The invention relates to a lithium ion battery balancing system and a balancing charging method thereof. Background technique [0002] A battery pack is made up of many batteries connected in series or in parallel. During the use and regular charging of these batteries, due to the aging of the batteries and the different temperatures of the batteries, uneven electrolyte density, capacity, voltage, etc. will occur. In this case, when the battery pack is discharged with a large current for a period of time, it will cause the imbalance between the batteries to a certain extent, and the polarity of the battery with a small capacity will be reversed during use, resulting in battery failure. cause permanent damage. Contents of the invention [0003] The object of the present invention is to provide an equalization method for lithium-ion power batteries, which enables balanced charging and discharging during the charging and discharging process of the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 高楠
Owner CHERY AUTOMOBILE CO LTD
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