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Method for improving electrolyte infiltration of soft package lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor wettability and long standing time of the electrolyte, and achieve the effects of reduced viscosity, improved wettability, and reduced resistance

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

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for improving the electrolyte infiltration of soft-pack lithium-ion batteries, so as to solve the problems of poor wetting performance of the existing electrolyte and long standing time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Put the battery cell that has been sealed and packaged by the top and side in an oven to remove moisture, and then lower it to a certain temperature to maintain a constant temperature of 40°C, while the electrolyte is preheated at 60°C for standby;

[0034] (2) Place the cell in the above step (1) in the middle of the designed splint and clamp it with a pressure of 60KPa, then evacuate to -80KPa, keep the vacuum for 8s, and inject the preheated electrolyte in the above step (1) , stand still for 50s;

[0035] (3) Apply an outward force to the aluminum-plastic film of the cell in step (2), the pulling force of the aluminum-plastic film is 20N, and hold for 7s; then clamp it with a splint, the clamping pressure is 120KPa, and apply it from bottom to top The roller pressure is 150KPa, the extruded gas is discharged from the air bag, and the rolling operation is repeated 3 times;

[0036] (4) Vacuumize the cell in step (3), the vacuum degree is -80KPa, keep the vacuum ...

Embodiment 2

[0039] (1) Put the battery cell that has been sealed and packaged by the top and side in an oven to remove moisture, and then lower it to a certain temperature to maintain a constant temperature of 60°C, while the electrolyte is preheated at 80°C for standby;

[0040] (2) Place the soft-packed battery cell in the above step (1) in the middle of the designed splint and clamp it with a pressure of 80KPa, then evacuate to -90KPa, keep the vacuum for 10s, and inject the preheated battery in the above step (1). Electrolyte, let stand for 30s;

[0041] (3) Apply an outward force to the aluminum-plastic film of the cell in step (2), the pulling force of the aluminum-plastic film is 10N, and hold for 10s; then clamp it with a splint, the clamping pressure is 100KPa, and apply it from bottom to top Roll pressure, the pressure is 200KPa, the extruded gas is discharged from the air bag, and the rolling operation is repeated 8 times;

[0042] (4) Vacuumize the cell in step (3), the vacuu...

Embodiment 3

[0045] (1) Place the battery cell that has been sealed and packaged by the top and side in an oven to remove moisture, and then lower it to a certain temperature to maintain a constant temperature of 50°C, while the electrolyte is preheated at 70°C for standby;

[0046] (2) Place the soft-packed battery cell in the above step (1) in the middle of the designed splint and clamp it with a pressure of 70KPa, then evacuate to -70KPa, keep the vacuum for 5s, and inject the preheated in the above step (1) Electrolyte, let stand for 40s;

[0047] (3) Apply an outward force to the aluminum-plastic film of the cell in step (2), the pulling force of the aluminum-plastic film is 30N, and hold for 5s; then clamp it with a splint, the clamping pressure is 150KPa, and apply it from bottom to top The pressure of the roller is 180KPa, the extruded gas is discharged from the air bag, and the rolling operation is repeated twice;

[0048] (4) Vacuumize the cell in step (3), the vacuum degree is ...

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Abstract

The invention discloses a method for improving electrolyte infiltration of a soft package lithium ion battery, which comprises the following steps of: (1) putting a battery cell subjected to top sidesealing and packaging into a drying oven to remove moisture, cooling to a certain temperature, keeping constant temperature, and preheating an electrolyte at the same time; (2) clamping the battery cell in the middle of a clamping plate, vacuumizing, keeping the vacuum degree for 5-10 seconds, injecting preheated electrolyte, and standing for 10-60 seconds; (3) applying an outward force to the battery cell aluminum-plastic film, and keeping for 5-10 seconds; then clamping is conducted through clamping plates, rolling pressure from bottom to top is applied, gas is exhausted out of the air bag,and rolling operation is repeated multiple times; (4) vacuumizing the battery cell, keeping the vacuum degree for 2-5 seconds, and then sealing; and (5) putting the sealed battery cell into a rotatingdevice, and rotating at a low speed for 1-3 hours to finish infiltration. The method has the advantages of simple steps, convenience in operation, capability of quickly infiltrating the electrolyte,shortening of the standing time of the battery cell after liquid injection, improvement of the production efficiency, and easiness in realization of industrialization.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for improving electrolyte infiltration of soft-pack lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high open circuit voltage, large specific energy, long cycle life, good safety performance, small self-discharge, and environmental protection. They have broad application prospects in 3C communication tools, electric tools, and electric vehicles. [0003] The preparation of lithium-ion batteries, from batching to sheet production, to composition and volume, each step plays a vital role in the performance of lithium-ion batteries. Especially the liquid injection link, in which the electrolyte is like the "blood" of the human body, transporting lithium ions to the positive and negative electrodes through the diaphragm. Therefore, only when the electrolyte is in good contact with the positive and ne...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 田军朱继涛李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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