A kind of lithium-ion battery forming method

A lithium ion battery and a technology of a chemical formation method are applied in the field of lithium ion battery preparation, and can solve the problems such as the inability to fully utilize the capacity of the lithium ion battery.

Active Publication Date: 2017-05-10
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: the existing lithium-ion battery formation method cannot fully exert the capacity of the lithium-ion battery

Method used

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  • A kind of lithium-ion battery forming method

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Effect test

Embodiment 1

[0044] This embodiment provides a method for forming a 633448 type soft-packed square lithium iron phosphate battery. The specific steps are as follows:

[0045] Step 1, inject electrolyte solution into the rolled and dried 633448 soft-packed square lithium iron phosphate battery, and then let it stand at room temperature for 48 hours;

[0046] Step 2, use a current of 90mA (ie 0.1C) to charge and preform the lithium iron phosphate battery obtained in step 1 in stages, and charge it with a capacity of 0.135Ah (ie 15% SOC), and let it stand for 10min until it is charged to 0.45Ah (i.e. 50% SOC); the first open circuit voltage U1 of the lithium iron phosphate battery after pre-forming is 3.19V;

[0047] Step 3, place the lithium iron phosphate battery obtained in step 2 in a high-pressure environment with a pressure of 1 MPa and let it stand for 24 hours; then take the battery out of the high-pressure environment and pump air, and the second open circuit voltage U2 of the batter...

Embodiment 2

[0051] This embodiment provides a method for forming a 633448 type soft-packed square lithium iron phosphate battery. The specific steps are as follows:

[0052] Step 1, inject electrolyte solution into the rolled and dried 633448 soft-packed square lithium iron phosphate battery, and then let it stand at room temperature for 24 hours;

[0053] Step 2, use a current of 45mA (that is, 0.05C) to charge and preform the lithium iron phosphate battery obtained in step 1 in stages, and charge it with a capacity of 0.135Ah (that is, 15% SOC), and let it stand for 10 minutes until it is charged to 0.27Ah (i.e. 30% SOC); the first open circuit voltage U1 of the lithium iron phosphate battery after pre-forming is 3.19V;

[0054] Step 3, place the lithium iron phosphate battery obtained in step 2 in a high-pressure environment with a pressure of 0.5 MPa and let it stand for 12 hours; then take the battery out of the high-pressure environment and pump air, and the second open circuit volt...

Embodiment 3

[0058] This embodiment provides a method for forming a 633448 type soft-packed square lithium iron phosphate battery. The specific steps are as follows:

[0059] Step 1, inject electrolyte solution into the rolled and dried 633448 soft-packed square lithium iron phosphate battery, and then let it stand at room temperature for 50 hours;

[0060] Step 2, use a current of 180mA (ie 0.2C) to charge and preform the lithium iron phosphate battery obtained in step 1 in stages, and charge it with a capacity of 0.135Ah (ie 15% SOC), and let it stand for 10 minutes until it is charged to 0.63Ah (i.e. 70% SOC); the first open circuit voltage U1 of the lithium iron phosphate battery after pre-forming is 3.21V;

[0061] Step 3, placing the lithium iron phosphate battery obtained in step 2 in a high-pressure environment with a pressure of 0.8 MPa and standing for 18 hours; then taking the battery out of the high-pressure environment and pumping air, at this time, the second open circuit vol...

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Abstract

The invention discloses a lithium ion battery formation method, which belongs to the technical field of lithium ion battery preparation. The formation method includes: step 1, after injecting the electrolyte solution into the lithium-ion battery, leaving the lithium-ion battery at room temperature for a first preset time; step 2, charging the lithium-ion battery obtained in step 1 with a first preset current Carry out staged charging, and measure the first open circuit voltage of the lithium-ion battery obtained; step 3, after the lithium-ion battery obtained in step 2 is placed in an environment with a preset pressure>0.1MPa for a third preset time, extract the obtained lithium ion Gas in the battery, and measure the second open circuit voltage of the lithium-ion battery obtained; step 4, compare the difference between the first open circuit voltage and the second open circuit voltage with the preset voltage, and compare the first open circuit voltage and the second open circuit voltage The lithium-ion battery whose second open-circuit voltage difference is smaller than the preset voltage is charged and discharged cyclically at the second preset current. The chemical conversion method can fully exert the capacity of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a formation method of lithium ion batteries. Background technique [0002] Lithium-ion batteries have attracted people's attention due to their high energy density and good cycle performance. In the past 20 years, they have developed rapidly. They are ideal power sources for small and lightweight electronic devices such as cameras, mobile phones, and notebook computers. Ideal light-duty high-energy power source. [0003] Formation is an important process in the production process of lithium-ion batteries. It is the full activation of battery active materials. The quality of formation directly affects the subsequent performance of lithium-ion batteries, especially the capacity and cycle life. It is higher than that of an insufficiently formed battery. For example, during the formation process, there is the formation of a solid electrolyte interface f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 焦方方朱广燕
Owner CHERY AUTOMOBILE CO LTD
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