Manufacturing method of bipolar polymer lithium ion battery and lithium ion battery

A lithium ion battery and a manufacturing method technology, which are applied in the field of bipolar polymer lithium ion battery manufacturing, can solve the problem of being difficult to meet the use requirements of long cycle life, avoid accelerated local aging, prolong cycle life, and improve internal performance. small resistance effect

Pending Publication Date: 2020-12-25
常德中科多源电力融合技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design methods and manufacturing methods of existing lithium-ion battery products are difficult to meet the requirements of long cycle life under high-power operating conditions

Method used

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  • Manufacturing method of bipolar polymer lithium ion battery and lithium ion battery
  • Manufacturing method of bipolar polymer lithium ion battery and lithium ion battery
  • Manufacturing method of bipolar polymer lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The preparation method of the positive electrode active material sheet and the negative electrode active material sheet specifically includes: weighing the corresponding amount of the positive electrode material or the negative electrode material according to the weight ratio and putting it into the mixing tank; adding the conductive agent and performing initial mixing for 0.5h to 2h; adding the binder , stirring and mixing; after stirring for 1h to 3h, start the heating device of the mixing tank, and start dry mixing after heating to the set temperature; after the binder is completely fibrous, the positive active material or negative active material is obtained, and the The positive active material or the negative active material is pressed into a required size.

[0038] The two surfaces of the first current collector are respectively coated with a conductive layer and dried to obtain a bipolar pole piece substrate.

[0039] The positive electrode active material sheet...

Embodiment 1

[0058] An embodiment of the present invention provides a method for making a bipolar polymer lithium ion, comprising the following steps:

[0059] Weigh the corresponding weight of lithium iron phosphate according to the proportion of 92% by weight and put it into the mixing tank, add the composite conductive agent of 2.5% by weight of conductive carbon and 2.5% of carbon nanotubes, and perform initial mixing.

[0060] After 1 hour, 3% by weight of binder polytetrafluoroethylene was added, and stirring and mixing were continued.

[0061] After 2 hours, start the heating device of the mixing tank and stir, and continue to mix at a constant temperature of 345 ° C for 1.5 hours. After the binder polytetrafluoroethylene is completely fibrous, the positive active material is obtained, and the high-pressure calendering equipment is used to obtain the positive electrode active material. On the ethylene glycol substrate, the positive active material is pressed into a positive active m...

Embodiment 2

[0078] An embodiment of the present invention provides a method for making a bipolar polymer lithium ion, comprising the following steps:

[0079] Weigh the corresponding weight of lithium iron phosphate according to the proportion of 92% by weight and put it into the mixing tank, add the composite conductive agent of 2.5% by weight of conductive carbon and 2.5% of carbon nanotubes, and perform initial mixing.

[0080] After 1 hour, 3% by weight of binder polytetrafluoroethylene was added, and stirring and mixing were continued.

[0081] After 2 hours, start the heating device of the mixing tank and stir, and continue to mix at a constant temperature of 345 ° C for 1.5 hours. After the binder polytetrafluoroethylene is completely fibrous, the positive active material is obtained, and the high-pressure calendering equipment is used to obtain the positive electrode active material. On the ethylene glycol substrate, the positive active material is pressed into a positive active m...

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Abstract

The invention is applicable to the technical field of lithium ion batteries, and provides a manufacturing method of a bipolar polymer lithium ion battery and a lithium ion battery. A bipolar pole piece, a single-side positive pole piece and a single-side negative pole piece are manufactured by utilizing a positive active material piece, a current collector and a negative active material piece through hot-pressing compounding and a rolling method, the obtained pole pieces adsorb a mixed solution containing an electrolyte solution, and the pole pieces are wrapped by a polymer film through ultraviolet irradiation; and rolling, punching and laminating are performed to obtain a pole group, and rolling, packaging and forming are carried out on the pole group to obtain the bipolar polymer lithiumion battery. The lithium ion battery manufactured by the manufacturing method provided by the invention has the advantages of high safety, small internal resistance, high charging and discharging power, wide working temperature range and long cycle life, and after the lithium ion battery is manufactured into a module and a system, a thermal management device can be simplified, and the overall system manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a manufacturing method of a bipolar polymer lithium ion battery and the lithium ion battery. Background technique [0002] Since the commercial application of lithium-ion batteries in 1991, with the continuous improvement of positive and negative electrode materials, product performance has been continuously improved, and the application range has been continuously expanded, covering four major product applications: stationary, power-driven, internal combustion engine-started and portable. field. From the perspective of the material system, the rated voltage of lithium-ion batteries with lithium iron phosphate as the positive electrode material is 3.2V, the rated voltage of lithium-ion batteries with lithium cobalt oxide and lithium nickel cobalt oxide as positive electrode materials is 3.6V, and the rated voltage of lithium-ion batteries with lithium ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M2004/029Y02E60/10Y02P70/50
Inventor 佘沛亮
Owner 常德中科多源电力融合技术研究院
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