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Lithium-ion battery pressure formation method

A lithium-ion battery and formation method technology, which is applied in the field of pressure formation of lithium-ion batteries, can solve problems such as cracking in the top seal area, damage to the battery cell, and packaging failure, and achieve a uniform interface, prevent the generation of lithium precipitation, and improve the hardness of the battery.

Active Publication Date: 2021-01-22
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to focus on the pressure formation process of lithium-ion batteries. During the pressurization process, the residual electrolyte inside the cell will quickly impact the top seal area, resulting in cracks in the top seal area or air bubbles leading to package failure. To solve the problem of irreversible damage, provide a lithium-ion battery pressure formation method that can effectively prevent the top seal failure caused by rapid pressurization action

Method used

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  • Lithium-ion battery pressure formation method
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  • Lithium-ion battery pressure formation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1: Under the pressure of 0.1MPa, let the lithium-ion battery stand still for 2.5 minutes;

[0056] Step 2: At a temperature of 85°C and a pressure of 0.4MPa, use a current of 0.03CmA to charge the lithium-ion battery that has completed step 1 with a constant current. The charging time is 4 minutes. During the formation process, the upper limit voltage reached is 3.4V ~3.8V, which is lower than the maximum charging cut-off voltage of 4.2V~4.4V.

[0057] Step 3: The lithium-ion battery completed in step 2 was placed under a pressure of 1.0 MPa, and the lithium-ion battery was left to stand for 2.5 minutes.

[0058] Step 4: The lithium-ion battery that has completed step 3 is charged at a constant current of 0.1CmA at a temperature of 85°C and a pressure of 0.6MPa. The charging time is 4 minutes. During the formation process, the upper limit of The voltage is 3.4V ~ 3.8V, which is lower than the maximum charging cut-off voltage of 4.2V ~ 4.4V.

[0059] Step 5: Put t...

Embodiment 2

[0063] Step 1: Under the pressure of 0.2MPa, let the lithium-ion battery stand still for 3 minutes;

[0064] Step 2: At a temperature of 85°C and a pressure of 0.4MPa, use a current of 0.04CmA to charge the lithium-ion battery that has completed step 1 with a constant current. The charging time is 5 minutes. During the formation process, the upper limit voltage reached is 3.4V ~3.8V, which is lower than the maximum charging cut-off voltage of 4.2V~4.4V.

[0065] Step 3: The lithium-ion battery completed in step 2 was placed under a pressure of 1.2 MPa, and the lithium-ion battery was left to stand for 2.5 minutes.

[0066] Step 4: The lithium-ion battery that has completed step 3 is charged at a constant current of 0.2CmA at a temperature of 85°C and a pressure of 0.6MPa. The charging time is 4 minutes. During the formation process, the upper limit of The voltage is 3.4V ~ 3.8V, which is lower than the maximum charging cut-off voltage of 4.2V ~ 4.4V.

[0067] Step 5: Put the l...

Embodiment 3

[0071] Step 1: Under the pressure of 0.1MPa, let the lithium-ion battery stand still for 2 minutes;

[0072] Step 2: At a temperature of 85°C and a pressure of 0.4MPa, use a current of 0.05CmA to charge the lithium-ion battery that has completed step 1 with a constant current. The charging time is 5 minutes. During the formation process, the upper limit voltage reached is 3.4V ~3.8V, which is lower than the maximum charging cut-off voltage of 4.2V~4.4V.

[0073] Step 3: The lithium-ion battery completed in step 2 is placed under a pressure of 1.2 MPa, and the lithium-ion battery is left to stand for 2 minutes.

[0074] Step 4: The lithium-ion battery that has completed step 3 is charged at a constant current of 0.2CmA at a temperature of 85°C and a pressure of 0.6MPa. The charging time is 5 minutes. During the formation process, the upper limit of The voltage is 3.4V ~ 3.8V, which is lower than the maximum charging cut-off voltage of 4.2V ~ 4.4V.

[0075] Step 5: Put the lit...

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Abstract

The invention relates to a lithium ion battery pressure formation method, which comprises the following steps that under the first preset pressure intensity, a lithium ion battery is subjected to still standing for 1.5min to 3min; under different main pressure intensities and at the first preset temperature, different currents are used for performing constant current charging on the lithium ion battery for a certain time; after the first constant current charging step, the lithium ion battery is subjected to still standing for a certain time by the second preset pressure intensity; after the last-time constant current charging step is executed, the lithium ion battery is subjected to still standing for 4.5min to 10min under the second preset intensity and the second preset temperature. After the lithium ion battery pressure formation method is adopted, the occurrence of top seal failure caused by fast pressurization action can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a pressure formation method of lithium ion batteries. Background technique [0002] With the continuous advancement of scientific and technological information, communication and digital products such as mobile phones and tablet computers have already entered the homes of ordinary people. Today's users are no longer just satisfied with owning a digital product, but put forward higher requirements for appearance, function, security, etc., which also promotes the rapid evolution of mobile phones and other products from functional phones to smart phones, and more Increasingly larger screens, higher performance, more compact size and other higher design requirements, which also require related accessories such as batteries to be more flexible to meet a variety of different design requirements ; Higher energy density, so that the volume can be reduced whil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 刘洋叶海松吕梦媛
Owner EVE ENERGY CO LTD