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Method for forming lithium manganese power cells

A technology of power battery and formation method, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery charging/discharging, etc. It can solve problems such as incomplete exhaust, poor battery consistency, and battery safety hazards, and achieve simple operation , high reliability, and the effect of improving available capacity

Active Publication Date: 2013-09-25
BEIQI FOTON MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the formation method used in lithium manganate batteries is to charge with a small current first, and then charge with a large current. Due to the unreasonable setting of the charging upper limit voltage and the oversimplification of the formation process, the formation of the SEI film is unstable and the exhaust is not complete, which affects the battery. The available capacity and cycle performance of the battery are poor, resulting in poor consistency of the battery, and there are hidden dangers to the safety of the battery.
For lithium manganese oxide power batteries for electric vehicles, the consistency and cycle performance of the battery are closely related to the performance of the vehicle. The existing formation methods are not suitable for the field of power batteries. To develop a stable and reliable Lithium-acid power battery formation method has become a top priority in the power battery manufacturing industry

Method used

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  • Method for forming lithium manganese power cells

Examples

Experimental program
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Effect test

no. 1 example

[0046] Take 1000 lithium manganese oxide batteries numbered S80200235MP after liquid injection, and let them stand for a first preset time t1 of 24 hours. Firstly, the battery cell is charged with the first preset current I1 at a constant current of 0.4A to the first preset voltage V1 of 3.45V, and the second preset time t2 is 10 minutes. Then charge the cell to a second preset voltage V2 of 3.9V with a second preset current I2 of 2A constant current, and let it stand for a third preset time t3 of 10 minutes. Finally, use the third preset current I3 as a constant current of 10A to charge the cell to the third preset voltage V3 as 4.2V, and then use the third preset current I3 as a constant current of 10A to discharge the cell to the fourth preset voltage V4 2.75V, repeat the last step once to complete the battery formation process.

no. 2 example

[0048] Take 1000 lithium manganese oxide batteries numbered S80200235MP after liquid injection, and let them stand for a first preset time t1 of 16 hours. Firstly, the battery cell is charged with the first preset current I1 at a constant current of 0.8A to the first preset voltage V1 of 3.4V, and the second preset time t2 is 20 minutes. Then charge the cell to a second preset voltage V2 of 3.95V with a second preset current I2 of 4A constant current, and let it stand for a third preset time t3 of 20 minutes. Finally, use the third preset current I3 as a constant current of 10A to charge the cell to the third preset voltage V3 as 4.2V, and then use the third preset current I3 as a constant current of 10A to discharge the cell to the fourth preset voltage V4 2.75V, repeat the last step 2 times to complete the battery formation process.

no. 3 example

[0050] Take 1000 lithium manganese oxide batteries numbered S80200235MP after liquid injection, and let them stand for the first preset time t1 of 20 hours. Firstly, the battery cell is charged with the first preset current I1 at a constant current of 1A to a first preset voltage V1 of 3.4V, and the second preset time t2 is 30 minutes. Then charge the cell to a second preset voltage V2 of 3.9V with a second preset current I2 of 2A constant current, and let it stand for a third preset time t3 of 30 minutes. Finally, use the third preset current I3 as a constant current of 16A to charge the cell to the third preset voltage V3 as 4.2V, and then use the third preset current I3 as a constant current of 16A to discharge the cell to the fourth preset voltage V4 2.75V, repeat the last step 5 times to complete the battery formation process.

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Abstract

The invention discloses a method for forming lithium manganese power cells. The method comprises the following steps: injecting liquid to a power cell and allowing for standing for a first preset time thereafter; allowing for standing for a second preset time after constant-current charge to a first preset voltage with a first preset current; allowing for standing for a third preset time after constant-current charge to a second preset voltage with a second preset current; and performing constant-current charge to a third preset voltage with a third preset current, then performing constant-current discharge to a fourth preset voltage with a third preset current, and repeating the step for a preset number of times. The method provided by an embodiment of the invention can form a compact and stable SEI film and completely eliminate gases generated in formation. The method effectively improves the available capacity of cells, the cycling performance, the consistency and the safety. Besides, the method is easy and reliable, is particularly suitable for lithium manganese power cells for electric vehicles, and can be promoted for wide applications.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for forming a lithium manganese oxide power battery. Background technique [0002] With the strengthening of people's awareness of environmental protection, the environmental pollution caused by automobile exhaust has attracted widespread attention. In order to eradicate the environmental pollution caused by automobile exhaust and alleviate the energy crisis, the research, development and industrialization of electric vehicles have issues of concern to the world. However, the biggest bottleneck restricting the development of electric vehicles is the power battery. Lithium-ion batteries have become the preferred power source for electric vehicles due to their high energy density, high power density, long cycle life, and good safety. Among them, lithium manganese oxide power battery has become the most popular lithium-ion power battery due to its ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/10Y02P70/50
Inventor 吴生先
Owner BEIQI FOTON MOTOR CO LTD
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