Formation capacity grading method of lithium ion battery

A lithium-ion battery and capacity-division technology, applied in secondary batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve problems such as hindering lithium ion migration, shorten the formation process time, enhance liquid retention, and improve performance effect

Inactive Publication Date: 2019-04-19
蜂巢能源(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some studies have shown that LiF is easily formed at high temperature and deposited on the negative electrode, hindering the migration of lithium ions (D.Aurbanch et al., Review on electrode-electroyte solution interactions, related to cathode materials for Li-ion batteries[J].J .Power Sources,2007(2):491-499)

Method used

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  • Formation capacity grading method of lithium ion battery
  • Formation capacity grading method of lithium ion battery
  • Formation capacity grading method of lithium ion battery

Examples

Experimental program
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Embodiment 1～10

[0040] In this embodiment, a group of 10 batteries is formed according to the method of the present invention. The specific method is as follows.

[0041] Set the negative pressure to -70kpa, and empty the air inside the battery cell after the assembly of incoming materials, and the extraction time is 5 seconds. Inject liquid into the cell after pumping air through negative pressure (-70kpa), and the tolerance of liquid injection is required to be 0.1g. After the liquid injection is completed, the liquid injection port is sealed by a detachable corrosion-resistant sealing rubber nail to isolate the air.

[0042] Stand at room temperature before forming, the temperature is 23±3℃, and the time is 72±3h to ensure the infiltration of the electrolyte on the pole piece.

[0043] Preheat the battery at high temperature for 15 minutes to 60±3°C, open the seal, and charge at this temperature with a small current of 0.2C to a SOC state of 2%, and then switch to charge at 0.7C to a sta...

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Abstract

The invention discloses a formation and capacity grading method for a lithium ion battery, and the method comprises a two-stage charging step of carrying out the constant-current charging of the two-stage charging at the current of 0.2 C or below and 0.5 C or above in sequence to a 40%-65% state of charge; an aging step, wherein the aging step is not performed for 24-48 hours at the ambient temperature; and a first charge and discharge cycle step of carrying out the first charge and discharge cycle at the ambient temperature of 0.7-1.0 DEG C, and finally performing charging to a state of charge of 30%-80%. A stable SEI film further improves the infiltration performance and the conductivity, and enhances the electrolyte retention amount of the battery cell, thereby improving the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to a chemical composition and capacity process method for lithium ion batteries. Background technique [0002] As one of the most important new energy products at present, lithium-ion batteries have the advantages of high rate performance, good cycle performance, safety, and environmental protection. In the manufacturing process of lithium-ion batteries, the assembled lithium-ion cells need to be formed, and the quality of the formation will directly affect the cycle life and other performance of lithium-ion batteries in the later use process. In order to improve the chemical formation effect including electrolyte infiltration, formation of dense SEI film, and reduction of gas production, various chemical formation processes have been adopted. [0003] In order to solve the time-consuming problem of the low current pre-charging method, a multi-stage process method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/44
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 刘小英李华吴军
Owner 蜂巢能源(武汉)有限公司
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