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Battery diaphragm, manufacturing method of the diaphragm and method of manufacturing battery using the diaphragm

A technology for battery separators and manufacturing methods, which is applied to battery components, chemical instruments and methods, circuits, etc., to achieve the effect of solving the problem of voids and free electrolyte, good uniformity of reaction, and good consistency

Active Publication Date: 2015-11-18
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a battery separator capable of solving the problem of gaps in liquid lithium ions and the problem of free electrolyte, ensuring the consistency, cycleability and safety of the battery reaction, the manufacturing method of the separator and the method of using the separator to make a battery

Method used

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  • Battery diaphragm, manufacturing method of the diaphragm and method of manufacturing battery using the diaphragm
  • Battery diaphragm, manufacturing method of the diaphragm and method of manufacturing battery using the diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add polyvinylidene fluoride (PVDF) with a molecular weight of 30-40W into N-methylpyrrolidone (NMP), and dissolve under constant temperature conditions to form a uniform high-molecular polymer solution, and the dissolution temperature is 55-75°C; the high-molecular polymer The weight ratio of each component of the solution is PVDF:NMP=15:100;

[0034] Use a reverse roll coater to coat both sides of the separator with a layer of polymer solution and dry at 100°C. After drying, the thickness of the polymer layer on both sides is 8 μm;

[0035] Use a hot press to heat the positive and negative plates and the diaphragm to melt the diaphragm treatment layer so that the three components of the diaphragm, positive electrode and negative electrode are connected as a whole. The hot pressing temperature is 123°C, the hot pressing pressure is 1.5MPa, and the hot pressing time for 7S.

[0036] The power battery produced according to this embodiment was disassembled under the fully...

Embodiment 2

[0038] Add the mixture of polypropylene and polymethyl acrylate with a molecular weight of 30-40W into N-methylpyrrolidone (NMP), and dissolve under constant temperature conditions to form a uniform high-molecular polymer solution. The dissolution temperature is 60-65°C; The weight ratio of the components of the polymer solution is: polypropylene: polymethyl acrylate: NMP = 10: 10: 100;

[0039] Use a reverse roll coater to coat both sides of the separator with a layer of polymer solution and dry at 110°C. After drying, the thickness of the polymer layer on both sides is 10 μm;

[0040] Use a hot press to hot-press the positive and negative plates and the diaphragm to melt the diaphragm treatment layer so that the three components of the diaphragm, positive electrode and negative electrode are connected as a whole; the hot-pressing temperature is 123°C, and the hot-pressing pressure is 1.5MPa. The time is 7S.

[0041] The power battery produced according to this embodiment wa...

Embodiment 3

[0043] Add polyvinylidene fluoride (PVDF) with a molecular weight of 30-40W into the acetone solution, and dissolve under constant temperature conditions to form a uniform high-molecular polymer solution at a dissolution temperature of 45-65°C; the weight ratio of the components of the high-molecular polymer solution For: PVDF: acetone = 30: 100;

[0044] Use a reverse roll coater to coat both sides of the separator with a layer of polymer solution and dry at 120°C. After drying, the thickness of the polymer layer on both sides is 12 μm;

[0045]Use a hot press to hot-press the positive and negative plates and the diaphragm to melt the diaphragm treatment layer so that the three components of the diaphragm, positive electrode and negative electrode are connected as a whole; the hot-pressing temperature is 123°C, and the hot-pressing pressure is 1.5MPa. The time is 7S.

[0046] The initial battery produced according to this embodiment was disassembled when the battery was full...

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Abstract

The invention discloses a battery diaphragm, a production method of the diaphragm and a method for producing a battery using the diaphragm. The battery diaphragm comprises a diaphragm body, wherein a high polymer layer is coated on the surface of the diaphragm body, and the high polymer layer is coated on two sides, contacted with a battery positive electrode sheet and a battery negative electrode sheet, of the diaphragm body. The production method of the diaphragm comprises the steps of: producing a high polymer solvent, coating the high polymer solvent on the surface of the diaphragm and drying. The method for producing the battery using the battery diaphragm comprises the steps of: carrying out thermal pressing treatment on the battery positive electrode sheet, the battery negative electrode sheet and the battery diaphragm, and coiling to form a power battery. According to the invention, the gap problem of liquid lithium ion and problem of free electrolyte are solved, and the reaction consistency, cyclicity and security of the power battery are guaranteed.

Description

technical field [0001] The invention relates to the field of automotive new energy power batteries, in particular to a battery diaphragm used for a power battery, a method for manufacturing the diaphragm, and a method for manufacturing a battery using the diaphragm. Background technique [0002] As the international energy shortage becomes more and more serious, electric vehicle technology is placed high expectations in the automotive industry; the safety of lithium-ion power batteries determines whether power batteries can be actually used in electric vehicles, and directly determines the performance of electric vehicles. [0003] At present, there are two types of power batteries, polymer batteries and liquid lithium-ion batteries; polymer batteries have the advantages of high safety, high cycleability and good consistency, but at the same time have disadvantages such as high cost, complicated process, and poor conductivity of the electrolyte. The cost of liquid lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B32B27/06B32B37/06B32B37/10B32B37/15
CPCY02E60/10
Inventor 翟冬刘明阳
Owner 奇瑞新能源汽车股份有限公司
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