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Secondary liquid injection method in lithium battery preparation

A secondary liquid injection and lithium battery technology, which is applied in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of electrolyte loss, increased electrolyte usage, and increased cumbersome liquid injection operations, etc. , to achieve the effect of increasing cycle life and improving loss

Inactive Publication Date: 2019-03-26
湖南安德丰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, during the formation process, exhaust gas will be discharged due to heating, and the exhaust gas generally carries a small part of electrolyte, resulting in loss of electrolyte. In order to ensure the quality of lithium batteries, electrolyte needs to be replenished later, increasing the usage of electrolyte. At the same time, it also increases the complexity of the injection operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The liquid injection method in the preparation of the lithium battery of this embodiment includes the following steps:

[0017] (1) The first liquid injection: inject the electrolyte into the lithium battery, and the injection volume is 80% of the total weight of the electrolyte;

[0018] (2) High-temperature activation: Send the lithium battery that has been injected for the first time to conventional high-temperature activation;

[0019] (3) Formation: Send the high-temperature activated lithium battery to the formation device for conventional formation;

[0020] (4) Voltage measurement: conduct a conventional voltage test on the formed lithium battery;

[0021] (5) Vacuuming: Vacuumize the lithium battery that has passed the voltage test, and keep it for 15s, and the vacuum degree is -0.12Mpa;

[0022] (6) Secondary liquid injection: re-inject the electrolyte into the vacuumized lithium battery, this injection amount is 20% of the total weight of the electrolyte; ...

Embodiment 2

[0025] The liquid injection method in the preparation of the lithium battery of this embodiment includes the following steps:

[0026] (1) The first liquid injection: inject the electrolyte into the lithium battery, and the injection volume is 80% of the total weight of the electrolyte;

[0027] (2) High-temperature activation: Send the lithium battery that has been injected for the first time to conventional high-temperature activation;

[0028] (3) Formation: Send the high-temperature activated lithium battery to the formation device for conventional formation;

[0029] (4) Voltage measurement: conduct a conventional voltage test on the formed lithium battery;

[0030] (5) Vacuuming: Vacuumize the lithium battery that has passed the voltage test, and keep it for 10s, and the vacuum degree is -0.12Mpa;

[0031] (6) Secondary liquid injection: re-inject the electrolyte into the vacuumized lithium battery, this injection amount is 20% of the total weight of the electrolyte; ...

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Abstract

The invention discloses a secondary liquid injection method in lithium battery preparation. The secondary liquid injection method comprises primary liquid injection, high-temperature activation, formation, voltage measurement, vacuum supply, secondary liquid injection, sealing and the like. By virtue of the secondary liquid injection, electrolyte can be avoided from being discharged along with waste gases in the high-temperature activation and formation process, loss of the electrolyte is effectively improved, and cycle life of the lithium battery is prolonged.

Description

technical field [0001] The invention relates to a liquid injection method in lithium battery preparation, belonging to the technical field of lithium battery preparation. Background technique [0002] Lithium batteries are widely used in electronic products due to their small size, high energy, high working voltage, no environmental pollution, long cycle life, and wide operating temperature range. The preparation process of lithium batteries is generally to make batteries with positive electrodes, negative electrodes and diaphragms, then place the batteries in the battery case, and inject non-aqueous electrolyte into the battery case. The amount of electrolyte absorption is directly related to the battery capacity and cycle life. Insufficient electrolyte absorption will cause a decrease in battery capacity, an increase in internal resistance of the battery, and a rapid attenuation of cycle life. [0003] In the prior art, liquid is injected once, then wrapped with insulatin...

Claims

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Application Information

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IPC IPC(8): H01M2/36H01M10/058H01M50/60
CPCH01M10/058H01M50/60Y02E60/10Y02P70/50
Inventor 张志军
Owner 湖南安德丰新能源科技有限公司
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