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Method for injecting liquid into a battery

A battery and liquid injection technology, which is applied in the field of energy storage, can solve the problems of long time consumption and achieve the effect of increasing the infiltration rate of liquid injection, shortening the infiltration time, and reducing the area of ​​dry area

Inactive Publication Date: 2019-01-25
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery liquid injection method provided by the invention can greatly reduce the width of the dry area in the battery pole piece, increase the infiltration speed, improve the production efficiency of the battery, and solve the bottleneck of the battery manufacturing in the prior art because the liquid injection process takes a long time The problem

Method used

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  • Method for injecting liquid into a battery
  • Method for injecting liquid into a battery
  • Method for injecting liquid into a battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This implementation provides a battery liquid injection method, the method includes the following steps:

[0079] (1) Inject the electrolyte solution into the cylindrical 18650 battery to be treated with a liquid injection cup to obtain the injected battery. The injected battery is maintained at -95kPa for 70s, and then vented to normal pressure for 5s, and then - Maintain at 95kPa for 60s, exhaust for 5s to normal pressure, first maintain at 0.35MPa for 185s, exhaust for 10s to normal pressure, then maintain at 0.35MPa for 100s, exhaust for 5s to normal pressure, and get the pretreated battery ;

[0080] Among them, the injection volume of the electrolyte is 25.04% of the volume of the inner cavity of the battery shell to be treated;

[0081] (2) The pretreated battery described in step (1) was left standing at -95kPa for 30s, then exhausted for 5s to normal pressure and left at 0.35MPa for 60s, Complete a differential pressure treatment cycle after exhausting for 5 ...

Embodiment 2

[0093] This implementation provides a battery liquid injection method, the method includes the following steps:

[0094] (1) Inject the electrolyte solution into the cylindrical 18650 battery to be treated with a liquid injection cup to obtain the injected battery. The injected battery is maintained at -100kPa for 60s, and then exhausted for 10s to normal pressure, and then - Maintain at 100kPa for 50s, exhaust for 10s to normal pressure, first maintain at 0.4MPa for 180s, exhaust for 12s to normal pressure, then maintain at 0.4MPa for 90s, exhaust for 10s to normal pressure, and get the pretreated battery ;

[0095] Wherein, the injection amount of the electrolyte is 25.570% of the inner cavity volume of the battery case to be treated;

[0096] (2) The pretreated battery described in step (1) was left standing at -100kPa for 25s, then exhausted for 10s to normal pressure and left at 0.4MPa for 50s, Complete a differential pressure treatment cycle after exhausting for 10s to...

Embodiment 3

[0101] (1) Inject the electrolyte solution into the cylindrical 18650 battery to be treated with a liquid injection cup to obtain the injected battery. The injected battery is maintained at -90kPa for 80s, and then vented to normal pressure for 5s, and then - Maintain at 90kPa for 70s, exhaust for 4s to normal pressure, first maintain at 0.3MPa for 190s, exhaust for 8s to normal pressure, then maintain at 0.3MPa for 110s, exhaust for 4s to normal pressure, and get the pretreated battery ;

[0102] Wherein, the injection amount of the electrolyte is 24.505% of the inner cavity volume of the battery case to be treated;

[0103] (2) The pretreated battery described in step (1) was left standing at -90kPa for 35s, then exhausted for 4s to normal pressure and left at 0.3MPa for 70s, Complete a pressure difference processing cycle after exhausting for 4s to normal pressure;

[0104] (3) Repeat the differential pressure treatment cycle of step (2) for 4 times to obtain a cycled bat...

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Abstract

A method for injecting liquid into a battery is provided. The method comprises the following steps: (1) injecting an electrolyte into a battery to be treated to obtain an inject battery, performing negative pressure static pretreatment on that injected battery, performing positive pressure static pretreatment after exhaust to normal pressure, and obtaining a pretreated battery after exhaust to normal pressure; (2) enabling the pretreated battery under negative pressure, then exhausting the battery to atmospheric pressure and then stationary under positive pressure, and completing a differential pressure treatment cycle after exhausted to atmospheric pressure; (3) repeating the differential pressure treatment cycle of the step (2) for at least one time to obtain a cyclically treated battery; (4) carrying out negative pressure static post-treatment on the cycled battery, and exhausting to atmospheric pressure to obtain the battery for completing liquid injection. The method of the invention realizes the reduction of the area of the electrode dry area after the liquid injection, the increase of the electrolyte infiltration rate and the shortening of the standing time required for waiting for the electrolyte to be completely infiltrated after the liquid injection process is completed.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a battery production method, in particular to a battery liquid injection method. Background technique [0002] With the rapid development of science and technology and economy, the functions of electronic products in the market are becoming more and more powerful, and the shape and size requirements are getting smaller and lighter. Lithium-ion batteries have the advantages of small size, high energy, high operating voltage, no environmental pollution, long cycle life, and wide operating temperature range. [0003] A lithium-ion battery generally includes a battery case, a battery cell contained in the battery case, and a non-aqueous electrolyte. The battery cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. In the preparation method of the battery, a positive pole, a negative pole and a separa...

Claims

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Application Information

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IPC IPC(8): H01M2/36H01M50/60
CPCH01M50/60Y02E60/10
Inventor 毛霏刘金成祝媛袁中直李彦灼茹昱
Owner EVE ENERGY CO LTD
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