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A charge-discharge liquid injection process for lithium-ion batteries

A lithium-ion battery, charging and discharging technology, which is applied in the charging/discharging of secondary batteries, secondary batteries, battery pack components, etc. Wide range, strong practicability, and the effect of improving injection efficiency

Active Publication Date: 2021-04-20
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of difficult liquid injection and low liquid injection efficiency of lithium-ion batteries, the present invention proposes a charge-discharge type liquid injection process for lithium-ion batteries

Method used

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  • A charge-discharge liquid injection process for lithium-ion batteries
  • A charge-discharge liquid injection process for lithium-ion batteries
  • A charge-discharge liquid injection process for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] For the "LFP23140160-55Ah" battery injection, the design injection volume is 150g. After the battery is wound, assembled, dried, short-circuit tested and weighed, the liquid is injected. After the battery is wound, assembled, dried, short-circuit tested and weighed Start liquid injection, specific liquid injection steps: (1) Charge and discharge the battery cycle, each charge time 3S, discharge time 3S, cycle 5 times, charge and discharge voltage 2-110V, current 0.5A-60A; (2) Charge and discharge the battery Vacuumize the interior until the vacuum degree reaches -0.09MPa, and keep it for 25S; (3) Inject 110g of electrolyte into the lithium-ion battery; (4) Pressurize the inside and outside of the battery to 0.6MPa at a rate of 0.1 MPa / S, keep the pressure for 30s; (5) Vacuumize the inside of the battery until the vacuum reaches -0.09MPa, and keep it for 25s; (6) Repeat steps (4) and (5) 5 times; (7) Add 40g of electrolyte Inject into the lithium-ion battery; (8) Repeat ...

Embodiment 2

[0042] For the "LFP23140160-55Ah" battery injection, the design injection volume is 150g. After the battery is wound, assembled, dried, short-circuit tested and weighed, the liquid is injected. After the battery is wound, assembled, dried, short-circuit tested and weighed Start liquid injection, specific liquid injection steps: (1) Charge and discharge the battery cycle, each charge time 3S, discharge time 3S, cycle 5 times, charge and discharge voltage 2-110V, current 0.5A-60A; (2) Charge and discharge the battery Vacuumize the interior until the vacuum degree reaches -0.085MPa, and keep it for 25S; (3) Inject 110g of electrolyte into the lithium-ion battery; (4) Pressurize the inside and outside of the battery to 0.6MPa at a rate of 0.1 MPa / S, keep the pressure for 30s; (5) Vacuumize the inside of the battery until the vacuum reaches -0.085MPa, and keep it for 25s; (6) Repeat steps (4) and (5) 5 times; (7) Add 40g of electrolyte Inject into the lithium-ion battery; (8) Repea...

Embodiment 3

[0052] The difference from Comparative Example 3 is that in step (1), the battery is charged and discharged cyclically, each charge time is 2S, and the discharge time is 2S.

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PUM

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Abstract

The invention relates to a charge-discharge liquid injection process for a lithium-ion battery, comprising steps: (1) charge and discharge the battery, the charging and discharging time is 2-5 seconds, and the charge-discharge cycle is 2-6 times; Vacuum; (3) Inject the electrolyte into the lithium-ion battery; (4) Pressurize the inside and outside of the battery to 0.3~0.7MPa at the same time, and keep the pressure for 5~30S; (5) Vacuum the inside of the battery; optional (6) Repeat steps (4)-(5) pressurize and evacuate n times, n≥1; optional (7) repeat steps (3)-(6) m times, m≥1, to complete multiple injections; The charging and discharging cycle in the step (1) starts with charging and ends with discharging. In the present invention, the battery is charged and discharged cyclically before the liquid injection so as to open the electrostatic adsorption between the positive electrode sheet, the separator and the negative electrode sheet, and then vacuumize the liquid injection. After the liquid injection, the electrolyte can be It penetrates smoothly to the middle of the core, improves the injection efficiency, and has a wide range of applications and strong practicability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a charging and discharging liquid injection process for lithium ion batteries. Background technique [0002] With the wide application and rapid development of lithium-ion batteries, the market's requirements for energy density and capacity of lithium-ion batteries continue to increase. Due to the demand for high energy density and high capacity of lithium-ion batteries, the winding of the battery core is getting tighter and tighter, the chemical substances in the battery core are increased, and the space is reduced. The common liquid injection process is used such as: liquid injection-vacuumize-pressurize-static ;Evacuate—inject—pressurize—stand still, the electrolyte cannot permeate smoothly, and the liquid injection becomes very difficult and time-consuming. Now the liquid injection process has become the bottleneck of the entire production line. In order to bre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/609H01M10/058H01M10/44
CPCH01M10/058H01M10/446H01M50/60Y02E60/10Y02P70/50
Inventor 白科郭娜娜游杰黄亚晖瞿晓龙谢佳
Owner 江西安驰新能源科技有限公司