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An energy storage device and electrochemical technology, applied in the field of electrochemistry, can solve the problems of viscous cells entering the shell, etc., and achieve the effect of fixed connection
Active Publication Date: 2016-03-30
DONGGUAN AMPEREX TECH +1
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[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
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Embodiment 1
[0054] 1. Preparation of positive electrode sheet
[0055] 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, which is then coated and compacted into a positive electrode sheet with a thickness of 100 μm.
[0056] 2. Preparation of negative electrode sheet
[0057] 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.
[0058] 3. Electrolyte Preparation
[0059] 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.
[0060] 4. Cell preparation
[0061] The prepared positive electrode sheet, PP separator, and negative elec...
Embodiment 2
[0070] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:
[0071] 5. Preparation of Adhesives
[0072] The thickness of the second functional layer was 20 μm.
Embodiment 3
[0074] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:
[0075] 5. Preparation of Adhesives
[0076] The thickness of the second functional layer was 40 μm.
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Abstract
The present invention provides an electrochemical energy storage device. The electrochemical energy storage device comprises an electrical core (1), an electrolyte and a packaging casing (2). The electrochemical energy storage device further comprises a glue material (3) located between the electrical core (1) and the packaging casing (2). The glue material (3) comprises a first adhesive layer (31) and a second functional layer (32). The first adhesive layer (31) is bonded directly or indirectly on the outer surface of the electrical core (1); the second functional layer (32) is arranged on one side opposite to the surface, of the electrical core (1), on which the first adhesive layer (31) is bonded directly or indirectly, before a pressure is applied to the electrochemical energy storage device, the electrical core (1) is not bonded with the packaging casing (2), and after the pressure is applied to the electrochemical energy storage device, the electrical core (1) is bonded with the packaging casing (2). The electrochemical energy storage device can achieve fixed connection between the electrical core and the packaging casing, solves the problems of a drop testing process, and can also solve the problem that packaging of the electrical core into the casing is difficult due to viscidity of both sides of the glue material.
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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