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A Liquid Injection Process for High Specific Energy Lithium-ion Batteries

A lithium-ion battery, high specific technology, applied in the direction of battery components, circuits, electrical components, etc., can solve the problems of long injection time and difficulty in injection of high specific energy lithium-ion batteries, so as to improve battery performance and shorten the The effect of liquid injection time and strong practicability

Active Publication Date: 2019-01-22
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

[0006] The present invention proposes a liquid injection process for high specific energy lithium ion batteries in order to solve the problems of difficult and time-consuming liquid injection for high specific energy lithium ion batteries

Method used

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  • A Liquid Injection Process for High Specific Energy Lithium-ion Batteries
  • A Liquid Injection Process for High Specific Energy Lithium-ion Batteries
  • A Liquid Injection Process for High Specific Energy Lithium-ion Batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0048] For "INR18650-2600mAh" battery injection, the electrolyte is made of LiPF 6(Concentration of 1 mole / liter) and additive vinylene carbonate (1%) are dissolved in ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate=1:1:1 (volume ratio) mixed solvent to prepare . The liquid injection volume is designed to be 5.6g. After the battery is wound, assembled, dried, short-circuit tested and weighed, the liquid injection starts. The specific liquid injection steps: (1) Open and close the nitrogen port 7 times in a row, and the opening time of each nitrogen port is 0.7 S, nitrogen gas (0.65MPa) enters the liquid injection cup, high-pressure nitrogen gas pulses the liquid injection hole through the liquid injection nozzle, the number of pulses is 7 times, and the pulse time is 0.7S; (2) Vacuum until the vacuum degree reaches -0.085 MPa, keep 60S; (3) Open the liquid injection solenoid valve, inject electrolyte; (4) Stand still for 240S, take out the battery, seal and weigh...

Embodiment 2

[0050] For "INR18650-2600mAh" battery injection, the electrolyte is made of LiPF 6 (Concentration of 1 mole / liter) and additive vinylene carbonate (1%) are dissolved in ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate=1:1:1 (volume ratio) mixed solvent to prepare . The liquid injection volume is designed to be 5.6g. After the battery is wound, assembled, dried, short-circuit tested and weighed, the liquid injection starts. The specific liquid injection steps: (1) Open and close the nitrogen port 7 times in a row, and the opening time of each nitrogen port is 0.7 S, nitrogen gas (0.5MPa) enters the liquid injection cup, and high-pressure nitrogen gas pulses the liquid injection hole through the liquid injection nozzle. The number of pulses is 7 times, and the pulse time is 0.7S; (2) Vacuum until the vacuum degree reaches -0.085 MPa, keep 60S; (3) Open the liquid injection solenoid valve, inject electrolyte; (4) Stand still for 240S, take out the battery, seal and w...

Embodiment 3

[0052] For "INR18650-2600mAh" battery injection, the electrolyte is made of LiPF 6 (Concentration of 1 mole / liter) and additive vinylene carbonate (1%) are dissolved in ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate=1:1:1 (volume ratio) mixed solvent to prepare . The liquid injection volume is designed to be 5.6g. After the battery is wound, assembled, dried, short-circuit tested and weighed, the liquid injection starts. The specific liquid injection steps: (1) Open and close the nitrogen port 7 times in a row, and the opening time of each nitrogen port is 0.7 S, nitrogen gas (0.6MPa) enters the liquid injection cup, high-pressure nitrogen gas pulses through the liquid injection nozzle to the liquid injection hole, the number of pulses is 7 times, and the pulse time is 0.7S; (2) Vacuum until the vacuum degree reaches -0.085 MPa, keep 60S; (3) Open the liquid injection solenoid valve, inject electrolyte; (4) Stand still for 240S, take out the battery, seal and we...

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Abstract

The invention relates to a liquid injection process of a high specific energy lithium ion battery. The high specific energy lithium ion battery includes a casing with a liquid injection hole and a built-in winding core. The process includes the following steps: (1) using a high pressure gas Perform pulse impact on the liquid injection hole; (2) vacuumize; (3) inject the electrolyte into the lithium-ion battery; (4) carry out static treatment on the lithium-ion battery, the high-pressure gas is 0.5-0.8MPa nitrogen, For the pulsed impact, the number of pulses is 3 to 10, and the pulse time is 0.3 to 1 second. Use high-pressure nitrogen to pulse the liquid injection hole to open the electrostatic adsorption between the positive electrode, separator and negative electrode, and then vacuumize the liquid injection and let it stand, the electrolyte can smoothly penetrate to the middle of the core, increasing the battery life. The liquid injection volume shortens the liquid injection time and improves the battery performance. The liquid injection time of the invention is at least 30% shorter than that of the common technology, and the invention has the advantages of high efficiency, low cost, wide application range and strong practicability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a liquid injection process for high specific energy 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 increase, and the space shrinks. The common liquid injection process such as: liquid injection-vacuumization-pressurization-static ; Vacuumizing-liquid injection-pressurization-static, the electrolyte cannot penetrate 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 b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/36H01M50/60
CPCH01M50/60Y02E60/10
Inventor 白科谢佳郭娜娜刘晟钢凌建军
Owner 江西安驰新能源科技有限公司
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