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A Lithium-ion battery formation process

A lithium-ion battery and battery technology, applied in the field of lithium-ion battery formation technology, can solve the problems of unstable SEI film, low active material efficiency, poor rate performance, etc., to improve cycle performance, speed up generation, and eliminate concentration differences. the effect of

Active Publication Date: 2021-08-06
广州市阳河电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional chemical formation process is to form the SEI film by charging with a small current, but it is easy to cause the instability of the SEI film, the low efficiency of the capacity of the active material, and the poor rate performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for forming a lithium ion battery, comprising the steps of:

[0018] (1) Heat the electrolyte to 40°C, and inject liquid into the soft-packed lithium-ion battery;

[0019] (2) Put the battery in the formation cabinet, adjust the temperature of the formation cabinet to 40°C, and charge it to 30% SOC with a constant current of 0.01C;

[0020] (3) Three-stage pulse charging, the first stage current is 0.05C, the pulse time is 90s, and the interval is 5s; the second stage current is 0.3C, the pulse time is 50s, and the interval is 5s; the third stage current is 0.8C, the interval is 5s , the battery voltage reaches the charging cut-off voltage, and the battery is charged at a constant voltage under the charging cut-off voltage until the charging current is lower than 0.01C;

[0021] (4) Discharge at 0.1C constant current to 2.4V, then adjust the current to 0.01C constant current discharge to discharge cut-off voltage;

[0022] (5) Two-stage pulse charging: the fi...

Embodiment 2

[0026] A method for forming a lithium ion battery, comprising the steps of:

[0027] (1) Heat the electrolyte to 50°C, and inject liquid into the soft-packed lithium-ion battery;

[0028] (2) Put the battery in the formation cabinet, adjust the temperature of the formation cabinet to 50°C, and charge it to 50% SOC with a constant current of 0.01C;

[0029] (3) Three-stage pulse charging, the first stage current is 0.1C, the pulse time is 90s, the interval is 5s; the second stage current is 0.4C, the pulse time is 50s, the interval is 5s; the third stage current is 1C, the interval is 5s, Until the battery voltage reaches the charging cut-off voltage, charge at a constant voltage under the charging cut-off voltage until the charging current is lower than 0.01C;

[0030] (4) Discharge to 2.2V with a constant current of 0.1C, and then adjust the current to 0.01C constant current to discharge to the discharge cut-off voltage;

[0031] (5) Two-stage pulse charging: the first stag...

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PUM

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Abstract

The invention provides a lithium-ion battery formation process. First, the electrolyte is preheated and then injected, and the battery is pre-activated by pre-charging with a small current, and then multi-stage pulse charging, constant current discharge, and multi-stage current gradually increase. The combination of pulse charging, high-current charging, and constant-voltage charging processes, by controlling the parameters of different stages to control the SEI generation rate, is conducive to the formation of a dense SEI film, eliminating the concentration polarization inside the battery, and effectively improving the cycle performance and performance of the battery. storage performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a formation process of lithium ion batteries. Background technique [0002] As a new type of clean energy, lithium-ion batteries have the advantages of high working voltage, high energy density, and light weight. They have been widely used in 3C consumer fields, new energy vehicles, and drones. It is precisely because of the increasing popularity of its use that people have stricter requirements on it. In addition to the improvement of battery materials and manufacturing processes, battery manufacturing methods are also being further optimized. Formation is an important link in the battery manufacturing process. Its purpose is to form a layer of solid electrolyte interfacial film (SEI film) on the internal electrode material of the battery during the first charge and discharge process of the battery. The quality of the formation process directly affects To the capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 赵瑞荣
Owner 广州市阳河电子科技有限公司