Polymer lithium ion battery formation process

A technology of lithium-ion batteries and polymers, applied in the direction of secondary batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve the problems that affect the cycle life of battery performance, it is difficult to meet market demand, and high manufacturing costs, etc., to achieve Guaranteed thickness and flatness, easy operation and simple process

Inactive Publication Date: 2020-03-20
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polymer lithium-ion batteries are almost designed with flexible packaging, their hardness cannot be compared with traditional aluminum or steel batteries, which also makes some ultra-thin polymer lithium-ion batteries with a thickness below 4.0mm very hard in terms of hardness. Difficult to meet market demand
Some people increase the hardness by reducing the amount of electrolyte in polymer lithium-ion batteries, but this will affect the performance of the battery, especially the cycle life due to insufficient electrolyte.
There are also some people who develop solid-state batteries by using gel electrolytes, but they require high manufacturing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A polymer lithium ion battery formation process, the process may further comprise the steps:

[0021] (1) Hot pressing before formation: After the liquid injection is left to stand, the battery to be formed is subjected to constant temperature hot pressing at a temperature of 80°C and a pressure of 0.25MPa for 70 minutes;

[0022] (2) Hot press formation: at a constant temperature of 70°C, it is carried out in three small steps,

[0023] S1: First apply 0.06MPa pressure to the battery for 2 minutes without charging; then pressurize the cell to 0.10MPa and charge it with a constant current of 0.05C for 3 minutes; finally pressurize it to 0.15MPa and charge it with a constant current of 0.05C 10min, the cut-off voltage is 3.20V;

[0024] S2: Keep the pressure of 0.15MPa, charge the battery with a constant current of 0.1C for 35min, and the charging cut-off voltage is 3.80V;

[0025] S3: Continue to maintain the pressure of 0.15MPa, charge the battery with a constant cur...

Embodiment 2

[0030] A polymer lithium ion battery formation process, the process may further comprise the steps:

[0031] (1) Hot pressing before formation: After the liquid injection is left to stand, the battery to be formed is subjected to constant temperature hot pressing at a temperature of 80°C and a pressure of 0.35MPa for 60 minutes;

[0032] (2) Hot press formation: at a constant temperature of 70°C, it is carried out in three small steps,

[0033] S1: First apply 0.06MPa pressure to the battery for 2 minutes without charging; then pressurize the cell to 0.10MPa and charge it with a constant current of 0.05C for 3 minutes; finally pressurize it to 0.25MPa and charge it with a constant current of 0.05C 10min, the cut-off voltage is 3.30V;

[0034] S2: Keep the pressure of 0.25MPa, charge the battery with a constant current of 0.1C for 35min, and the charging cut-off voltage is 3.90V;

[0035] S3: Continue to maintain the pressure of 0.25MPa, charge the battery with a constant cur...

Embodiment 3

[0040] A polymer lithium ion battery formation process, the process may further comprise the steps:

[0041] (1) Hot pressing before formation: After the liquid injection is left to stand, the battery to be formed is subjected to constant temperature hot pressing at a temperature of 80°C and a pressure of 0.45MPa for 60 minutes;

[0042] (2) Hot press formation: at a constant temperature of 70°C, it is carried out in three small steps,

[0043] S1: First apply 0.06MPa pressure to the battery for 2 minutes without charging; then pressurize the cell to 0.10MPa and charge it with a constant current of 0.05C for 3 minutes; finally pressurize it to 0.35MPa and charge it with a constant current of 0.05C 10min, the cut-off voltage is 3.30V;

[0044] S2: Keep the pressure of 0.35MPa, charge the battery with a constant current of 0.1C for 35min, and the charging cut-off voltage is 3.85V;

[0045] S3: Continue to maintain the pressure of 0.35MPa, charge the battery with a constant cur...

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Abstract

The invention discloses a formation process of a polymer lithium ion battery. The formation process comprises hot pressing before formation, hot pressing formation and hot pressing after formation, hot pressing before formation can completely discharge gas between battery roll core layers, so that the positive plate, the negative plate, the diaphragm and the electrolyte are in full contact, and preparation is made for formation; hot-pressing formation is adopted during formation, a stable and compact SEI film can be formed on the surface of the negative plate at a proper temperature, and expansion of the positive plate and the negative plate can be effectively inhibited under a certain pressure, so that the thickness of the battery is reduced, and the capacity of the battery is improved; according to the method, proper temperature and pressure are adopted after formation, so that the flatness and hardness of the battery cell can be improved, the formed SEI film can quickly tend to be stable, and the cycle life of the battery is prolonged. The method is simple in process and easy to operate, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a polymer lithium ion battery formation process. Background technique [0002] Polymer lithium-ion batteries are currently widely used in consumer electronics products such as mobile phones, tablet computers, and mobile power supplies. Since polymer lithium-ion batteries are almost designed with flexible packaging, their hardness cannot be compared with traditional aluminum or steel batteries, which also makes some ultra-thin polymer lithium-ion batteries with a thickness below 4.0mm very hard in terms of hardness. Difficult to meet market demand. Some people increase the hardness by reducing the amount of electrolyte in polymer lithium-ion batteries, but this will affect the performance of the battery, especially the cycle life, due to insufficient electrolyte. Some people have also developed solid-state batteries by using gel electrolytes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 李露黄小刘小虹李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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