A method for accelerating the absorption of soft-pack lithium-ion battery injection and soft-pack lithium-ion battery

A technology of lithium-ion batteries and ion batteries, applied in secondary batteries, battery pack parts, non-aqueous electrolyte storage batteries, etc., can solve problems such as obstruction, inability to fully escape gas from the cell structure, inability to promote deep penetration of electrolyte, etc. , to achieve the effect of improving wettability, sufficient penetration, and avoiding safety problems

Active Publication Date: 2018-03-02
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vacuum of this method cannot effectively escape the residual gas in the cell structure, and the residual gas in the cell structure hinders the infiltration of the electrolyte and the pole piece or diaphragm, and cannot effectively improve The fluidity of the electrolyte cannot promote the penetration of the electrolyte into the battery cell, and the improvement of the liquid absorption capacity of the battery cell is limited

Method used

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  • A method for accelerating the absorption of soft-pack lithium-ion battery injection and soft-pack lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for accelerating the absorption of the soft-pack lithium-ion battery by injecting liquid in this embodiment includes the following steps:

[0029] 1) In a glove box filled with dry nitrogen, the temperature in the glove box is kept at 45°C through a thermocouple installed inside the glove box, and the electrolyte solution is injected into the lithium-ion battery soft bag three times in the glove box. The amount of liquid remains the same, which is one-third of the total liquid injection volume of the soft-pack lithium-ion battery. In this embodiment, the amount of each liquid injection is 9g. Pressure and negative pressure cycle and stand still; after the liquid injection is completed, seal the soft-packed lithium-ion battery;

[0030] The extrusion is to apply a pressure of 0.2MPa to the two sides of the soft-pack lithium-ion battery for 2s, and then remove the pressure;

[0031] The negative pressure cycle standing still is: standing in a vacuum environmen...

Embodiment 2

[0035] The method for accelerating the absorption of the soft-pack lithium-ion battery by injecting liquid in this embodiment includes the following steps:

[0036] 1) In a glove box filled with dry air, the temperature in the glove box is kept at 50°C by means of a thermocouple installed inside the glove box. In the glove box, the electrolyte solution is injected into the lithium-ion battery soft bag three times, each injection The amount of liquid remains the same, which is one-third of the total liquid injection volume of the soft-pack lithium-ion battery. In this embodiment, the amount of each liquid injection is 9g. Pressure and negative pressure cycle and stand still; after the liquid injection is completed, seal the soft-packed lithium-ion battery;

[0037] The extrusion is to apply a pressure of 0.3MPa to the two sides of the soft-pack lithium-ion battery for 2s, and then remove the pressure;

[0038] The negative pressure cycle standing still is: standing in a vacuum...

Embodiment 3

[0042] The method for accelerating the absorption of the soft-pack lithium-ion battery by injecting liquid in this embodiment includes the following steps:

[0043] 1) In a glove box filled with dry argon gas, the temperature in the glove box is kept at 50°C by means of a thermocouple installed inside the glove box, and the electrolyte solution is injected into the lithium-ion battery soft pack three times in the glove box, each time The amount of liquid injection remains the same, which is one-third of the total liquid injection volume of the soft-packed lithium-ion battery. In this embodiment, the amount of each liquid injection is 9g. Squeeze and negative pressure cycle to stand still; after the liquid injection is completed, seal the soft-packed lithium-ion battery;

[0044] The extrusion is to apply a pressure of 0.3MPa to the two sides of the soft-pack lithium-ion battery for 2s, and then remove the pressure;

[0045] The negative pressure cycle standing still is: stand...

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Abstract

The invention relates to a liquid-injecting accelerated absorption method for a soft-pack lithium-ion battery and a soft-pack lithium-ion battery, belonging to the technical field of lithium-ion batteries. The method for accelerating the absorption of soft-pack lithium-ion battery injection according to the present invention comprises: under the protection of a dry inert gas, inject the electrolyte solution into the soft-pack lithium-ion battery three times in a glove box at 45-50°C, and after each injection, Squeeze the soft-packed lithium-ion battery sequentially and leave it in a negative pressure cycle; seal the soft-packed lithium-ion battery; the degree of vacuum during the negative pressure cycle is continuously changed between -0.08~-0.01MPa, and the The time for standing under negative pressure is 2-8s; the sealed soft-pack lithium-ion battery is kept at 70-80°C for 4-5h, and the soft-pack lithium-ion battery is pressed at least once during the standing process and turned upside down . The method of the invention promotes the absorption of the electrolyte in the battery core, and improves the consistency of the absorption of the electrolyte in the soft pack lithium ion battery.

Description

technical field [0001] The invention relates to a liquid-injecting accelerated absorption method for a soft-pack lithium-ion battery and a soft-pack lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] The electrochemical performance of lithium-ion batteries is closely related to its manufacturing process, and the product quality of lithium-ion batteries depends to a large extent on the process control of its manufacturing process. The manufacture of lithium-ion batteries is a complex process, including many different processes, and each process includes many small processes. The process effect of each process will have a great impact on the electrochemical performance of lithium-ion batteries. The electrolyte injection process is one of the key processes in the lithium battery manufacturing process. The effects of electrolyte injection and absorption directly affect the electrochemical performance of the battery such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M2/36H01M10/0525H01M50/609H01M50/618
CPCH01M10/0525H01M10/058H01M50/60Y02E60/10Y02P70/50
Inventor 孙晓宾王海平王赞霞梁雅明刘吉云潘文成
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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