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A precharged high-efficiency liquid injection process for lithium ion batteries

A lithium-ion battery, pre-charging technology, applied in the direction of secondary battery charging/discharging, secondary battery, battery pack components, etc. performance effect

Inactive Publication Date: 2019-01-25
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

[0008] The present invention proposes a pre-charged high-efficiency liquid injection process for lithium-ion batteries in order to solve the problems of difficult and time-consuming liquid injection for lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] For the "LFP23140160-55Ah" battery injection, the battery starts to be injected after winding, assembling, drying, measuring short circuit and weighing. The specific injection steps: (1) The first injection, injecting 40% of the electrolyte into lithium ions In the battery; (2) Precharge the battery, the charging rate is 1C, and the charging time is 60S; (3) The second liquid injection, inject the remaining 60% electrolyte into the lithium-ion battery; (4) The battery after liquid injection Put it into an activation room with a temperature of 55°C for high-temperature activation for 11 hours; (5) Perform formation on the activated battery, first charge it at 0.02C for 300 minutes, then charge it at a constant current of 0.05C to 3.65V, and finally let it stand at room temperature for 1 hour.

[0032] Table 1. The liquid injection process of the present invention compares with common liquid injection mode

[0033]

[0034] It can be seen from Table 1 that compa...

Embodiment 2-9

[0036] The steps of Examples 2-9 are as follows: Inject liquid into the "LFP23140160-55Ah" battery, start the liquid injection after the battery is wound, assembled, dried, tested for short circuit and weighed. Specific liquid injection steps: (1) First liquid injection , inject 40% of the electrolyte into the lithium-ion battery; (2) pre-charge the battery, the charging rate is 0.1C ~ 1.7C, and the charging time is 60s; (3) the second injection, inject the remaining 60% electrolyte In the lithium-ion battery; (4) activate the battery after the second liquid injection at 55°C for 11 hours; (5) perform formation on the activated battery, first charge it at 0.02C for 300min, then charge it at a constant current of 0.05C to 3.65V, and finally stand at room temperature for 1h.

[0037] Table 2 Effect of charging rate on battery performance

[0038]

[0039] It can be seen from Table 2 that when the charging rate is 0.3C to 1.3C, the first-time efficiency and 500-cycle c...

Embodiment 10-14

[0041] The steps of Examples 10-14 are as follows: Inject liquid into the "LFP23140160-55Ah" battery, start the liquid injection after the battery is wound, assembled, dried, tested for short circuit and weighed. Specific liquid injection steps: (1) First liquid injection , inject 40% of the electrolyte into the lithium-ion battery; (2) pre-charge the battery, the charging rate is 1.1C, and the charging time is 30-300s; (3) the second injection, inject the remaining 60% electrolyte In lithium-ion batteries; (4) Activate the injected battery at 55°C for 11 hours; (5) Form the activated battery, first charge it at 0.02C for 300min, then charge it at 0.05C constant current to 3.65V, Finally, let stand at room temperature for 1 h.

[0042] Table 3 Effect of charging time on battery performance

[0043]

[0044] It can be seen from Table 3 that when the charging time is 30-180s, the initial efficiency of the battery and the capacity retention rate after 500 cycles show a...

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PUM

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Abstract

The invention relates to a precharged high-efficiency liquid injection technology of a lithium ion battery, comprising the following steps: first liquid injection, wherein the liquid injection amountis 20-60% of the total liquid injection amount; The batteries after the first injection are precharged with a charge rate of 0.1 C -1.7 C and a charge time of 30 -300s. 40 to 80 percent of the total liquid injection amount; High temperature activation is performed, activation temperature is 30-90DEG C, activation time is 8-15h; Formation. A first injection solution of the present invention is injected into a part of the electrolyte, then the electrostatic adsorption between the pole piece and the diaphragm is opened by precharging, the pole piece and the diaphragm are loosely separated, the electrolyte is injected into the battery for the second time, and the electrolyte can smoothly penetrate into the middle of the coil core, the electrolyte is completely absorbed by the pole piece through the high-temperature static electrolyte, and the SEI membrane is formed after the electrolyte is formed; It not only shortens the injection time and improves the injection efficiency, but also improves the first efficiency and cycle life of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a pre-charged high-efficiency 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/44H01M10/058H01M10/0525H01M50/609
CPCH01M10/0525H01M10/058H01M10/446H01M50/60Y02E60/10Y02P70/50
Inventor 白科宋庆彬游杰徐小明
Owner 江西安驰新能源科技有限公司
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