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A kind of soft pack lithium-ion battery manufacturing method

An ion battery and manufacturing method technology, applied in secondary battery manufacturing, electrolyte battery manufacturing, non-aqueous electrolyte battery and other directions, can solve the problems of battery virtual power, insufficient electrolyte infiltration, low-voltage battery and the like

Active Publication Date: 2020-10-23
浙江大象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

Injection of electrolyte in lithium-ion batteries is a very demanding process in the manufacturing process of lithium-ion batteries. At present, the actual production process includes winding, encapsulation in packaging shells, baking cells, injection of electrolytes, sealing, and formation. ;According to the current process, it takes a long time to bake the battery cells and requires a large amount of aluminum-plastic film packaging; and it is not easy to grasp the proper electrolyte in the process design. In the actual process, some batteries are likely to have too much electrolyte and cause electrolysis. Liquid pollution, more battery swelling during formation will also cause many other adverse effects in other processes; in addition, the electrolyte of some batteries is likely to be too small, resulting in insufficient electrolyte infiltration of the pole pieces in the battery, resulting in battery virtual Electricity or low capacity or low voltage conditions can even cause the battery to catch fire while charging
In addition, the battery core is also packaged in a semi-closed aluminum-plastic film packaging shell before the electrolyte is injected, and the electrolyte is not easy to enter due to the tight packaging between the core pole piece and the separator. The inside of the winding core is fully infiltrated with the pole piece and the diaphragm, and it is easy to cause electrolyte pollution when the main liquid tank is filled and packaged, and more air pockets of the aluminum-plastic film are required.

Method used

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  • A kind of soft pack lithium-ion battery manufacturing method
  • A kind of soft pack lithium-ion battery manufacturing method
  • A kind of soft pack lithium-ion battery manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention relates to a method for manufacturing a soft-packed lithium-ion battery. The method includes winding the core, baking the core, immersing in liquid, encapsulating and sealing in a packaging case, and forming; the steps of the method are as follows:

[0029] (1) Core winding: wind the positive and negative electrode sheets and the diaphragm on the winding machine to obtain the core, and press the core to form;

[0030] (2) Core baking: Put the core formed by pressing the core into a baking oven and bake at a temperature of 75°C; first vacuum the oven to -0.06MPa, bake for 2 hours, and then put the High-purity nitrogen, then evacuated to -0.06MPa, baked for 2h, then introduced high-purity nitrogen; finally evacuated to -0.1MPa, baked for 2h;

[0031] (3) Liquid immersion: put the baked core into a glove box filled with freeze-dried gas, place an immersion tank and a squeeze jig in the glove box, put the core vertically into the immersion tank, positive and n...

Embodiment 2

[0037] The invention relates to a method for manufacturing a soft-packed lithium-ion battery. The method includes winding the core, baking the core, immersing in liquid, encapsulating and sealing in a packaging case, and forming; the steps of the method are as follows:

[0038] (1) Core winding: wind the positive and negative electrode sheets and the diaphragm on the winding machine to obtain the core, and press the core to form;

[0039] (2) Core baking: Put the core formed by pressing the core into a baking oven and bake at a temperature of 85°C; first vacuum the oven to -0.04MPa, bake for 1 hour, and then put the High-purity nitrogen, then evacuated to -0.04MPa, baked for 1h, then introduced high-purity nitrogen; finally evacuated to ~0.09MPa, baked for 1h;

[0040] (3) Liquid immersion: put the baked core into a glove box filled with freeze-dried gas, place an immersion tank and a squeeze jig in the glove box, put the core vertically into the immersion tank, positive and n...

Embodiment 3

[0046] The invention relates to a method for manufacturing a soft-packed lithium-ion battery. The method includes winding the core, baking the core, immersing in liquid, encapsulating and sealing in a packaging case, and forming; the steps of the method are as follows:

[0047] (1) Core winding: wind the positive and negative electrode sheets and the diaphragm on the winding machine to obtain the core, and press the core to form;

[0048] (2) Core baking: Put the core formed by pressing the core into a baking oven and bake at a temperature of 75-85°C; first vacuum the oven to -0.05MPa, and bake for 1.5h. Then pass in high-purity nitrogen, then evacuate to -0.05MPa, bake for 1.5h, then pass in high-purity nitrogen; finally evacuate to ~0.095MPa, and bake for 1.5h;

[0049] (3) Liquid immersion: put the baked core into a glove box filled with freeze-dried gas, place an immersion tank and a squeeze jig in the glove box, put the core vertically into the immersion tank, positive an...

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PUM

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Abstract

The invention provides a method for manufacturing a soft-pack lithium-ion battery, which belongs to the technical field of lithium-ion battery manufacturing. The method includes core winding, core baking, liquid immersion, encapsulation and sealing in a packaging shell, and chemical formation; the steps of the method are as follows: (1) core winding; (2) core baking; 3) Soaking liquid; (4) Encapsulating and sealing into the packaging shell; (5) Forming. The method of the invention can not only fully infiltrate the winding core with the electrolyte, but also avoid electrolyte pollution, save the amount of packaging film, and ensure sufficient formation; in addition, it can also save the production cycle and improve the efficiency of battery production. The battery formation effect of the present invention is better, and the voltage, internal resistance, and voltage attenuation ratio K value are more concentrated and relatively smaller; and the capacity performance is relatively better.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for manufacturing soft-pack lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, long life and no memory effect, and are widely used in various civilian electronic equipment and electric vehicles, energy storage, mobile power and other fields. Injection of electrolyte in lithium-ion batteries is a very demanding process in the manufacturing process of lithium-ion batteries. At present, the actual production process includes winding, encapsulation in packaging shells, baking cells, injection of electrolytes, sealing, and formation. ;According to the current process, it takes a long time to bake the battery cells and requires a large amount of aluminum-plastic film packaging; and it is not easy to grasp the proper electrolyte in the process design. In the actual pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/0431H01M10/058Y02E60/10Y02P70/50
Inventor 覃晓捷
Owner 浙江大象新能源科技有限公司