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Method for improving infiltration effect of battery cell and lithium ion battery cell

A technology for lithium-ion batteries and wetting effects, which is applied in the field of lithium-ion battery cells and improves the wetting effect of batteries, and can solve the problems of poor wetting effect and limited improvement of the wetting effect of lithium-ion batteries, so as to improve safety performance and improve Effect of wetting effect, DCR and capacity improvement

Active Publication Date: 2021-02-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above four published patents all provide a technical solution for improving the wetting performance of lithium-ion batteries, their treatment processes are only limited to vacuum pumping, pressurized standing and other treatment processes, and their wetting effects are still poor. Limited improvement in battery wetting effect

Method used

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  • Method for improving infiltration effect of battery cell and lithium ion battery cell
  • Method for improving infiltration effect of battery cell and lithium ion battery cell
  • Method for improving infiltration effect of battery cell and lithium ion battery cell

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for improving the wetting effect of electric cores, comprising the following steps:

[0043] a) Preliminary infiltration: After the lithium-ion battery packs the cells and injects liquid, vacuumize three times in a vacuum box with a pressure of 94Kpa, and the duration of each vacuuming is 18 minutes;

[0044] b) Micro-charging: place the battery cells vertically for 7 hours, ensure that there is no extrusion between the cells after the cells are placed vertically, and then micro-charge with a small current;

[0045] c) Rolling: After the micro-charging is completed, continue to place the battery vertically for 108 hours, during which the battery is beaten and rolled every 35 hours, and the rolling pressure is 0.10MPa;

[0046] d) Pre-charging: use 0.25C current to pre-charge the rolled cells;

[0047] e) High temperature soaking: place the precharged cells vertically in a high temperature environment of 42°C for 2.5 days, and then form them with a high current...

Embodiment 2

[0049] A method for improving the wetting effect of electric cores, comprising the following steps:

[0050] a) Preliminary infiltration: After the lithium-ion battery packs the cells and injects liquid, vacuumize three times in a vacuum box with a pressure of 90Kpa, and the duration of each vacuuming is 20 minutes;

[0051] b) Micro-charging: place the battery cells vertically for 5 hours, ensure that there is no extrusion between the cells after the cells are placed vertically, and then micro-charge with a small current;

[0052] c) Rolling: After the micro-charging is completed, continue to place the battery vertically for 96 hours, during which the battery is slapped and rolled every 30 hours, and the rolling pressure is 0.15MPa;

[0053]d) Pre-charging: use 0.01C current to pre-charge the rolled cells;

[0054] e) High temperature soaking: place the precharged cells vertically in a high temperature environment of 45°C for 2 days, and then form them with a high current. ...

Embodiment 3

[0056] A method for improving the wetting effect of electric cores, comprising the following steps:

[0057] a) Preliminary infiltration: After the lithium-ion battery packs the cells and injects liquid, vacuumize three times in a vacuum box with a pressure of 98Kpa, and the duration of each vacuuming is 15 minutes;

[0058] b) Micro-charging: place the cells vertically for 10 hours, ensure that there is no extrusion between the cells after placing the cells vertically, and then perform micro-charging with a small current;

[0059] c) Rolling: After the micro-charging is completed, continue to place the battery vertically for 120 hours, during which the battery is beaten and rolled every 40 hours, and the rolling pressure is 0.15MPa;

[0060] d) Pre-charging: use 0.5C current to pre-charge the rolled cells;

[0061] e) High temperature soaking: place the precharged cells vertically in a high temperature environment of 38°C for 3 days, and then form them with a high current. ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a method for improving the infiltration effect of a battery cell. The method comprises the steps of primary infiltration, micro-charging, rolling, pre-charging, high-temperature infiltration and the like. The invention further discloses the lithium ion battery cell obtained after treatment by the method. By adopting the infiltration method provided by the invention, the infiltration effect of the battery cell pole piece is greatly improved, the surface of the battery cell pole piece is fully infiltrated by theelectrolyte, the surface of the pole piece is free of lithium precipitation, wrinkles and peeling, and the safety performance of the battery cell is improved. Performance comparison data show that compared with the prior art, the K value, DCR and capacity of the process provided by the invention are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for improving the wetting effect of batteries and batteries of lithium-ion batteries. Background technique [0002] In the existing lithium battery infiltration, after the bare cell is packaged, a certain amount of electrolyte is poured manually, and the vacuum box is evacuated three times in a row, so that the electrolyte flows back and forth on the pole piece to achieve the purpose of infiltration. The infiltration process of lithium-ion batteries is a key link in the manufacture of batteries, and the quality of the infiltration effect of the pole piece determines the performance of the batteries. At present, in order to shorten the production cycle and quickly deliver samples to customers, most battery manufacturers have poor infiltration effect of batteries, which has caused many problems. [0003] Chinese Patent Publication No. CN106876792A disclosed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 王朋建韩笑李凡群王海伦王勇张厚泼胡江生
Owner WANXIANG 123 CO LTD
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