Self-discharge screening method for improving matching consistency of lithium ion batteries

A technology of a lithium-ion battery and a screening method is applied in the field of self-discharge screening for improving the consistency of lithium-ion battery configuration, and can solve the problems of inability to meet the supporting requirements of modern equipment, unsuitable for mass production applications, and low screening accuracy, etc. The effect of good consistency, high matching efficiency and high matching accuracy

Inactive Publication Date: 2019-03-19
JIANGSU FRONT NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has low screening accuracy and low efficiency. On the one hand, it cannot meet the supporting requirements of modern equipment, and on the other hand, it is not suitable for mass production applications.

Method used

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  • Self-discharge screening method for improving matching consistency of lithium ion batteries

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Embodiment Construction

[0018] The present invention is further illustrated below by way of examples.

[0019] In order to further optimize the quality of battery packs, the present invention provides a self-discharge screening method for improving the consistency of lithium-ion battery packs, which is carried out according to the following steps:

[0020] 1.1 Charging

[0021] In this embodiment, a total of 1,250 IFP2083200-020 lithium-ion batteries are taken from the user. After the conventional capacity-dividing treatment, the batch of batteries is uniformly charged with a 5% SOC state of charge by a 4A current constant current charging method.

[0022] 1.2 Alternate shelving and voltage measurement

[0023] Put it aside for 24 hours at 25°C±3°C, then measure the battery voltage as OCV1, then turn it to 45°C±1°C and leave it for 168 hours, then measure the battery voltage as OCV2, then put the battery at 25°C±3°C Shelving for 168h, the battery voltage measured again is OCV3.

[0024] 1.3 Screen...

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Abstract

The invention discloses a self-discharge screening method for improving the matching consistency of lithium ion batteries. The self-discharge screening method for improving the matching consistency ofthe lithium ion batteries comprises the following steps that after the same batch of batteries are subjected to conventional capacity grading, 5-20% SOC state-of-charge electric quantity is charged in a 4-6A current constant current charging mode. After the batteries are put on hold at normal temperature for 24-48h, the battery voltage is measured as OCV1, then the temperature is turned to 45 DEGC, and the batteries are put on hold for 120-168h, then the battery voltage is measured as OCV 2, then the batteries are put on hold at normal temperature, the battery voltage is measured as OCV3 again, values of OCV1, OCV2 and OCV3 are measured, and the voltage difference is calculated, that is , delta V1= OCV1-OCV2 and delta V2= OCV2-OCV3; and an out-of-tolerance value code of the delta V1 is VO1, an out-of-tolerance value code of the delta V2 is VO2, a batch of out-of-tolerance batteries can be roughly eliminated with a VO1 set value, and then a batch of the batteries can be finely eliminated with a VO2 set value. The self-discharge screening method for improving the matching consistency of the lithium ion batteries has simple and convenient implementation, high matching precision, good consistency and high matching efficiency, and is especially suitable for batch production application.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry. Specifically, the invention relates to a lithium ion battery, especially a self-discharge screening method for improving the consistency of lithium ion battery matching. Background technique [0002] Lithium-ion battery is an energy storage product with high specific energy, low self-discharge and good high and low voltage performance. It is widely used in modern office equipment, communication equipment and electric tools. In reality, lithium-ion batteries are usually composed of several single batteries connected in series or in parallel, which is commonly known as grouping in this industry. However, the batteries connected in groups have a "bucket effect", that is, the performance of the battery pack is determined by the worst single cell. Therefore, screening single cells with basically consistent performance is a key link in battery assembly and an important task for lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
CPCB07C5/344
Inventor 马亚旗佘沛亮孙全楼志强徐斌
Owner JIANGSU FRONT NEW ENERGY
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