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Liquid injection process for high-specific-energy lithium ion battery

A lithium-ion battery, high-ratio technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of high-specific-energy lithium-ion battery injection difficulty, long injection time, etc., and shorten the injection time. time, improve battery performance, and increase the effect of liquid injection

Active Publication Date: 2017-02-22
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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  • Liquid injection process for high-specific-energy lithium ion battery
  • Liquid injection process for high-specific-energy lithium ion battery
  • Liquid injection process for high-specific-energy lithium ion battery

Examples

Experimental program
Comparison scheme
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 for a high-specific-energy lithium ion battery; the high-specific-energy lithium ion battery comprises a shell with an injection hole and an internal wound core; the process comprises the steps of (1) performing pulse impacting on the injection hole by using high-pressure gas; (2) evacuating; (3) injecting electrolyte into the lithium ion battery; (4) allowing the lithium ion battery to stand; the high-pressure gas is nitrogen 0.5-0.8 MPa, and pulse impacting is performed 3-10 times for 0.3-1 S. Pulse impacting is performed on the injection hole by using high-pressure nitrogen so that electrostatic adsorption among a positive plate, a diaphragm and a negative plate is opened, evacuating, injection and standing are carried out, electrolyte may permeate to the middle of the wound core smoothly, liquid injection is increased for the battery, electrolyte permeating time is shortened, and battery properties are improved. The injection time herein is at least 30% shorter than that of common processes, and the process of the invention is high in efficiency, low in cost, widely applicable and high in practicality.

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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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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