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Formation method for cylindrical lithium battery

A chemical formation method and lithium battery technology, which are applied in the directions of non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, secondary battery charging/discharging, etc., can solve the problems of affecting the production cost of batteries, cumbersome chemical formation steps, long formation time, etc. Production cycle, guarantee product quality requirements, and the effect of convenient operation

Active Publication Date: 2013-11-06
SHUANGDENG GRP
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AI Technical Summary

Problems solved by technology

Cylindrical lithium batteries are mainly made of steel shells. The existing cylindrical lithium batteries have cumbersome formation steps, long formation time, large equipment investment, high power consumption, time-consuming and laborious, which greatly affect the production cost of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The present invention is specifically illustrated by the following examples.

[0013] Make a rate type cylindrical lithium battery 18500, the rate discharge is 10C, and the capacity is 1100mAh. The low-voltage steps of battery formation, capacity separation and screening are all carried out on the formation cabinet, collectively referred to as battery formation, and are carried out as follows:

[0014] Chemical steps:

[0015] 1. Stand still: 5min.

[0016] 2. Constant current charging: 0.05C charging cut-off voltage 3.4V 480 minutes cut-off.

[0017] 3. Constant current and constant voltage charging: 0.2C charging, cut-off voltage 4.2V, cut-off current 0.05C.

[0018] 4. Let stand for 30 minutes.

[0019] 5. Constant current discharge: 10C discharge, cut-off voltage 3.0V, discharge time 90min.

[0020] 6. Stand still: 5min.

[0021] 7. Constant current and constant voltage charging: 1C charging, cut-off voltage 4.2V, cut-off current 0.05C, charging time 90min.

...

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Abstract

The invention provides a formation method for a cylindrical lithium battery. In the formation process, three and a half charge-discharge cycles are performed; meanwhile, a solid electrolyte interface (SEI) film of the negative electrode of a battery is formed, and the capacity grading and low-voltage screening of the battery are performed. By the method, cylindrical lithium battery with a steel shell is manufactured, the formation cycle times are reduced, and process parameters are optimized, so the process is simplified and standardized, production cycle is shortened, and production cost is effectively reduced. Moreover, the method is convenient to operate, and suitable for bulk production; and by the method, quality of products can be guaranteed.

Description

technical field [0001] The invention relates to a method for manufacturing a lithium ion battery, in particular to a method for forming a cylindrical lithium battery with a metal shell as the outer shell. Background technique [0002] Today, with the increasing development of lithium-ion batteries, the production process of small lithium batteries is becoming more and more mature, the competition among manufacturers is fierce, and the profit margins are getting smaller and smaller, so reducing production costs has become a top priority. Lithium batteries are divided into flexible packaging and metal casings (mainly steel casings). The former needs to be pumped and heat-sealed twice, while the latter does not need to be pumped, and it will be formed after sealing the mouth. Cylindrical lithium batteries are mainly made of steel shells. The existing cylindrical lithium batteries have cumbersome formation steps, long formation time, large equipment investment, high power consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 杨丛利程传捷邱小勇
Owner SHUANGDENG GRP
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