Electrochemical energy storage device

An energy storage device and electrochemical technology, which is applied in the field of electrochemistry, can solve the problems such as the difficulty of inserting the battery into the shell, and achieve the effects of improving ion conduction capacity, improving long-term cycle performance, and improving liquid swelling

Inactive Publication Date: 2016-07-06
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the background technology, the object of the present invention is to provide an electrochemical energy storage device, which can not only realize the fixed connection between the battery cell and the packaging case, but also solve the problems that occur during the drop test. Various problems, and can avoid the problem that the battery core is difficult to enter the shell caused by the stickiness on both sides of the adhesive material, and also has good cycle performance and large rate charge and discharge performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of positive electrode sheet

[0051] LiCoO 2 , conductive carbon, and polyvinylidene fluoride are dispersed in N-methylpyrrolidone at a weight ratio of 96:1:3 to make a positive electrode slurry, and then coated and compacted to make a positive electrode sheet with a thickness of 100 μm.

[0052] 2. Preparation of negative electrode sheet

[0053] Disperse graphite, conductive carbon, sodium carboxymethyl cellulose, and styrene-butadiene rubber in deionized water at a weight ratio of 97:1:1:1 to make negative electrode slurry, and then coat and compact to make a negative electrode with a thickness of 90 μm piece.

[0054] 3. Electrolyte Preparation

[0055] Prepare EC, PC, DEC, and EMC in a weight ratio of 20:20:50:10 to make a non-aqueous organic solvent, add 1mol / L LiPF 6 As a lithium salt, the preparation of the electrolyte is completed.

[0056] 4. Cell preparation

[0057] The prepared positive electrode sheet, PP separator, and negative electr...

Embodiment 2

[0065] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:

[0066] 5. Preparation of Adhesives

[0067] The protective layer is PVDF with a thickness of 20 μm.

Embodiment 3

[0069] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:

[0070] 5. Preparation of Adhesives

[0071] The protective layer is FPP with a thickness of 3 μm.

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Abstract

The invention provides an electrochemical energy storage device. The electrochemical energy storage device comprises a battery core, an electrolyte and a package shell and also comprises a glue material, wherein the glue material is arranged between the battery core and the package shell and comprises a viscous layer and a protection layer, the viscous layer is directly or indirectly pasted on the outer surface of the battery core, one surface, far away from the battery core, of the viscous layer is an adhesive surface, the protection layer is arranged on the adhesive surface of the viscous layer and is completely or partially dissolved or swelled and dispersed in the electrolyte so that the adhesive surface of the viscous layer is exposed and the battery core and the package shell are bonded by the viscous layer, the protection layer is a polar molecule, and the polar molecule comprises one or more of -F, -CO-NH-, -NH-CO-NH- and -NH-CO-O-. By the electrochemical energy storage device, the battery core and the package shell can be fixedly connected, the various problems during the drop test process are solved, the problem that the battery core is difficult to enter the shell due to viscosity of the two surfaces of the glue material also can be prevented, and meanwhile, the electrochemical energy storage device has high cycle performance and high-rate charging-discharging performance.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to an electrochemical energy storage device. Background technique [0002] Due to the advantages of high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, lithium-ion secondary batteries make them widely used in communications, electrical appliances, electronic information, power equipment and The application of energy storage and other fields has achieved unprecedented development, and with the rapid development of society, people put forward higher requirements for the energy density, charge and discharge speed, cycle life and safety performance of lithium-ion secondary batteries. [0003] The drop test is a more stringent safety test for lithium-ion secondary batteries. Lithium-ion secondary batteries are extremely prone to problems such as top seal breaking, liquid leakage, separator wri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/10H01M50/103H01M50/124
CPCH01M10/058C09J109/00H01M10/0431H01M10/0563H01M10/056H01M10/0587Y02E60/10H01M50/124H01M50/1245H01M50/461Y02P70/50H01M50/103C09J133/06C09J153/02C09J175/04C09J183/04Y02E60/13C09J2301/302H01M10/44H01M50/107H01M50/121H01M50/183C09J107/00C09J2433/00
Inventor 鲍晋珍喻鸿钢方宏新杨超曹政
Owner DONGGUAN AMPEREX TECH
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