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Electrolyte infiltration method for a soft pack lithium-ion battery

An ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of no vacuum degree and repetition times, cumbersome process, high cost, etc., and achieve significant practical value, good interface, and good wetting effect

Active Publication Date: 2021-02-26
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are some relevant researches, such as the Chinese patent CN107895815A, which discloses a method for infiltrating the electrolyte of a soft-packed lithium-ion battery. After vacuumizing the lithium-ion battery, an inert gas needs to be introduced, and it is necessary to repeat 1- 8 times, this method is costly and the process is cumbersome
And there is no specific standard for vacuum degree and number of repetitions. It needs to be reset for different batteries, different net liquid volumes and different operations; it is not conducive to actual production operations

Method used

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  • Electrolyte infiltration method for a soft pack lithium-ion battery
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Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of electrolyte soaking method of soft pack lithium ion battery, comprises the steps:

[0028] (1) First take the soft-pack battery, inject electrolyte to 1 / 3 of the approved injection volume, leave the top side unsealed, and place it in a vacuum drying oven; set the temperature to 40°C;

[0029] (2) Vacuumize for the first time to a vacuum degree of -25KPa, hold the pressure for 1min and then carry out the second vacuumization to the vacuum degree of -50KPa, and carry out the third time of vacuuming to the vacuum degree of -70KPa after holding the pressure for 1min. Press for 1 minute; carry out the fourth vacuuming to a vacuum degree of -90KPa, and hold the pressure for 1 minute;

[0030] (3) After the pressure holding is completed, inject the electrolyte for the second time, inject the liquid to 2 / 3 of the approved liquid injection volume, and repeat the vacuuming and pressure holding steps of step (2);

[0031] (4) After the pressure holding is completed, inj...

Embodiment 2

[0034] A kind of electrolyte soaking method of soft pack lithium ion battery, comprises the steps:

[0035] (1) First take the soft-pack battery, inject electrolyte to 1 / 3 of the approved injection volume, leave the top side unsealed, and place it in a vacuum drying oven; set the temperature to 60°C;

[0036] (2) Vacuumize for the first time to a vacuum degree of -25KPa, hold the pressure for 1min and then carry out the second vacuumization to the vacuum degree of -50KPa, and carry out the third time of vacuuming to the vacuum degree of -70KPa after holding the pressure for 1min. Press for 1 minute; carry out the fourth vacuuming to a vacuum degree of -90KPa, and hold the pressure for 1 minute;

[0037] (3) After the pressure holding is completed, inject the electrolyte for the second time, inject the liquid to 2 / 3 of the approved liquid injection volume, and repeat the vacuuming and pressure holding steps of step (2);

[0038] (4) After the pressure holding is completed, inj...

Embodiment 3

[0041] A kind of electrolyte soaking method of soft pack lithium ion battery, comprises the steps:

[0042] (1) First take the soft-pack battery, inject electrolyte to 1 / 3 of the approved injection volume, leave the top side unsealed, and place it in a vacuum drying oven; set the temperature to 80°C;

[0043] (2) Vacuumize for the first time to a vacuum degree of -25KPa, hold the pressure for 1min and then carry out the second vacuumization to the vacuum degree of -50KPa, and carry out the third time of vacuuming to the vacuum degree of -70KPa after holding the pressure for 1min. Press for 1 minute; carry out the fourth vacuuming to a vacuum degree of -90KPa, and hold the pressure for 1 minute;

[0044] (3) After the pressure holding is completed, inject the electrolyte for the second time, inject the liquid to 2 / 3 of the approved liquid injection volume, and repeat the vacuuming and pressure holding steps of step (2);

[0045] (4) After the pressure holding is completed, inj...

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Abstract

The invention discloses an electrolyte infiltration method for a soft-packed lithium-ion battery, which adopts the method of liquid injection combined with gradient vacuuming and pressure-holding, and respectively places the soft-packed batteries after liquid injection in a vacuum drying box, and sets the temperature at 40 -85°C, set the vacuum degree gradient to gradually vacuumize and maintain the pressure, slowly reduce the gas phase resistance at the solid-gas-liquid three-phase interface, prevent the deformation of the pole piece due to excessive pressure difference, and let the electrolyte and The direct contact of the pole pieces reduces the soaking time; the method of the invention is simple and easy to implement, convenient and fast, suitable for actual production operations, and has remarkable practical value.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an electrolyte infiltration method for a soft-pack lithium-ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. They have been widely used in mobile phones, notebook computers, power tools and other fields. And gradually promote in the field of electric vehicles. [0003] When the lithium battery reaches the waste standard or suddenly fails, it is often disassembled to analyze what causes the performance of the battery to decay or drop suddenly. When dismantling and analyzing lithium batteries, it was found that batteries with poor cycle performance are often related to the poor infiltration effect of the electrolyte on the pole pieces. When the infiltration effect of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 许成巧杜立成陈启多高远鹏程君
Owner ETRUST POWER ETP GRP LTD
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