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A method for evaluating the formation process of lithium-ion batteries

A technology of lithium ion battery and evaluation method, applied in the field of evaluation of lithium ion battery formation process, can solve the problems of long time consumption and poor practicability, and achieve the effect of reducing side reactions, low solubility, good thermal stability and chemical stability

Active Publication Date: 2020-05-12
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of evaluation method of lithium-ion battery formation process, thereby solve the problem of time-consuming long, practicability of existing evaluation method

Method used

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  • A method for evaluating the formation process of lithium-ion batteries
  • A method for evaluating the formation process of lithium-ion batteries
  • A method for evaluating the formation process of lithium-ion batteries

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Experimental program
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Embodiment 1

[0020] The evaluation method of the lithium-ion battery forming process of the present embodiment, the technological process is as follows figure 1 As shown, the following steps are taken:

[0021] 1) After the lithium-ion battery is formed, its voltage is detected as U 1 , then the lithium-ion battery was aged at 45°C for 24h, and the detection voltage was U 2 , record the first pressure drop ΔU 1 =U 1 -U 2 ;

[0022] 2) The aging battery in step 1) is subjected to cyclic discharge and charge at a rate of 1C / 1C, the number of cycles is two, and it is charged to the cut-off voltage of the formation process, and then the specific voltage value is detected, which is recorded as U 3 ; Then the battery after cyclic discharge and charge is aged at 45°C for 24h, and the detection voltage is U 4 , record the secondary pressure drop ΔU 2 =U 3 -U 4 ;

[0023] 3) Calculate the difference between the first pressure drop and the second pressure drop ΔU=ΔU 1 -ΔU 2 , comparing t...

Embodiment 2

[0025] The evaluation method of the lithium-ion battery forming process of the present embodiment, the technological process is as follows figure 1 As shown, the following steps are taken:

[0026] 1) After the lithium-ion battery is formed, its voltage is detected as U 1 , then the lithium-ion battery was aged at 35°C for 48h, and the detection voltage was U 2 , record the first pressure drop ΔU 1 =U 1 -U 2 ;

[0027] 2) The aging battery in step 1) is subjected to cyclic discharge and charge at a rate of 1C / 1C, the number of cycles is two, and it is charged to the cut-off voltage of the formation process, and then the specific voltage value is detected, which is recorded as U 3 ; Then the battery after cyclic discharge and charge is aged at 35°C for 48h, and the detection voltage is U 4 , record the secondary pressure drop ΔU 2 =U 3 -U 4 ;

[0028] 3) Calculate the difference between the first pressure drop and the second pressure drop ΔU=ΔU 1 -ΔU 2 , comparing t...

Embodiment 3

[0030] The evaluation method of the lithium-ion battery forming process of the present embodiment, the technological process is as follows figure 1 As shown, the following steps are taken:

[0031] 1) After the lithium-ion battery is formed, its voltage is detected as U 1 , then the lithium-ion battery was aged at 55°C for 24h, and the detection voltage was U 2 , record the first pressure drop ΔU 1 =U 1 -U 2 ;

[0032] 2) The aging battery in step 1) is subjected to cyclic discharge and charge at a rate of 1C / 1C, the number of cycles is two, and it is charged to the cut-off voltage of the formation process, and then the specific voltage value is detected, which is recorded as U 3 ; Then the battery after cyclic discharge and charge is aged at 55°C for 24h, and the detection voltage is U 4 , record the secondary pressure drop ΔU 2 =U 3 -U 4 ;

[0033] 3) Calculate the difference between the first pressure drop and the second pressure drop ΔU=ΔU 1 -ΔU 2 , comparing t...

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Abstract

The invention relates to a method for evaluating a lithium ion battery formation process. The method comprises the steps of detecting a first voltage drop after formation and aging processes, detecting a secondary voltage drop after volume division and aging processes, and comparing the difference between the first voltage drop and the second voltage drop. According to the evaluation method, agingacceleration testing is carried out on a battery after formation and volume division respectively; and on the basis of comparison of the first voltage drop and the second voltage drop, activation effects of different formation procedures are determined. An SEI film die formed by the good formation procedure has characteristics of good compact and uniform effects, low solubility in an electrolyte,and high thermal stability and chemical stability; reaction of the electrode material and the electrolyte is prevented; and the side reaction and the self-discharge rate are reduced. Correspondingly,the formation effect of the lithium ion battery is evaluated based on the voltage drop generated by the aging accelerated testing. The method is suitable for screening out a proper formation procedure quickly and accurately by the lithium ion battery manufacturer.

Description

technical field [0001] The invention belongs to the field of formation of lithium-ion batteries, and in particular relates to an evaluation method for the formation process of lithium-ion batteries. Background technique [0002] As a high-efficiency energy storage element, lithium-ion batteries have the advantages of high energy density, long cycle life, long cycle life, good rate performance and safety performance, and have been widely used in electronic equipment, communication equipment, medical equipment and new energy vehicles. field. [0003] Formation is an important process in the production process of lithium-ion batteries. During formation, a passivation layer is formed on the surface of the negative electrode, that is, a solid electrolyte interface film (SEI film). The quality of the SEI film directly affects the cycle life, stability, and Electrochemical properties such as self-discharge and safety. Formation is the first charge and discharge process of lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/385
Inventor 火晓勇孙姣姣刘红涛董红玉
Owner 河南电池研究院有限公司
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