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Safe lithium ion battery and preparation method thereof

A lithium-ion battery, safe technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of low pass rate and low safety

Active Publication Date: 2020-07-07
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a safe lithium-ion battery and its preparation method, and aim to solve the technical problems of low safety and low pass rate of the existing lithium-ion battery when performing short-circuit tests

Method used

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  • Safe lithium ion battery and preparation method thereof
  • Safe lithium ion battery and preparation method thereof

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preparation example Construction

[0032] On the other hand, the embodiment of the present invention also provides a method for preparing the above-mentioned safe lithium-ion battery. The preparation method comprises the following steps, and the process is as follows: figure 2 Shown:

[0033] S01: Encapsulate the negative tab 4 with high temperature adhesive tape 5 ( figure 2 a);

[0034] S02: Cover the edge of one end of the negative electrode sheet 6 to be wound with the high-temperature adhesive tape 5 after encapsulation, and connect the negative electrode tab 4 to the blank part of the tail of the negative electrode sheet 6 ( figure 2 b);

[0035]S03: Wind the negative electrode sheet 6 connected with the negative electrode tab 4, the separator, and the positive electrode sheet (not marked in the figure) into a core ( figure 2 c), and put the winding core 2 into the casing 1 to complete the bottom welding and rolling groove process to form the final lithium ion battery ( figure 2 d), where one en...

Embodiment 1

[0040] A cylindrical lithium-ion battery, the structure of which is as follows figure 1 shown. The lithium-ion battery comprises a casing 1 and a winding core 2 arranged in the casing 1, and a positive pole ear 3 and a negative pole ear 4; the negative pole ear 4 is connected to the tail of the negative electrode sheet 6 on the outer wall of the winding core 2, and the The negative tab 4 is arranged along the side wall and the bottom of the housing 1, and the bent part of the negative tab 4 at the connection between the side wall and the bottom of the housing 1 is covered with a high-temperature adhesive tape 5 with a thickness of 30 mm. The base material of the high temperature tape 5 contains PI, and the glue of the high temperature tape 5 contains PMMA. The length of the high temperature adhesive tape 5 adjacent to the side wall of the housing 1 is 4mm, the length of the high temperature adhesive tape 5 adjacent to the bottom of the housing 1 is 4mm, and the length of the ...

Embodiment 2

[0046] A cylindrical lithium-ion battery, the structure of which is as follows figure 1 shown. The lithium-ion battery comprises a casing 1 and a winding core 2 arranged in the casing 1, and a positive pole ear 3 and a negative pole ear 4; the negative pole ear 4 is connected to the tail of the negative electrode sheet 6 on the outer wall of the winding core 2, and the The negative tab 4 is arranged along the side wall and the bottom of the housing 1, and the bent part of the negative tab 4 at the connection between the side wall and the bottom of the housing 1 is covered with a high-temperature adhesive tape 5 with a thickness of 70 mm. The base material of the high temperature tape 5 contains PI, and the glue of the high temperature tape 5 contains PMMA. The length of the high temperature adhesive tape 5 adjacent to the side wall of the housing 1 is 6 mm, the length of the high temperature adhesive tape 5 adjacent to the bottom of the housing 1 is 6 mm, and the length of th...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a safe lithium ion battery and a preparation method thereof. The lithium ion battery includes a casing, a winding core arranged in the casing, a positive electrode lug and a negative electrode lug, the negative electrode lug is connected to the tail of the negative electrode sheet on the outer wall of the winding core, and the negative electrode lug is along the The side wall and bottom of the casing are arranged, and the bending part of the negative electrode lug at the connection between the side wall and the bottom of the casing is attached with a high-temperature adhesive tape, and the high-temperature adhesive tape is attached to the safe lithium-ion battery. Decomposition generates gas during short circuit test. The safe lithium-ion battery provided by the invention can make the CID disconnection time of the cover plate during the short-circuit test of the lithium-ion battery shortened from 20 to 40 seconds to 5 to 5 to 5 seconds without affecting the original performance of the battery and without changing the original structural design of the battery. After 10 seconds of disconnection, the short-circuit test pass rate is increased from 90% to 95%.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a safe lithium ion battery and a preparation method thereof. Background technique [0002] At present, most of the electrolytes used in lithium-ion batteries on the market are organic electrolytes. The solvent components of organic electrolytes are generally esters such as PC, EC, and DMC, which are flammable and therefore have certain safety risks. Therefore, whether it is In national standards such as "Safety Requirements for Lithium-ion Batteries and Battery Packs for Portable Electronic Products" or "Safety Requirements and Test Methods for Power Batteries for Electric Vehicles", it is mandatory for lithium-ion batteries to pass short circuit, heavy hammer, heat abuse, overcharge, etc. Waiting for security testing. When the battery is subjected to a short-circuit test, due to a large overcurrent, the battery generates a large amount of heat in a sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M2/34H01M10/0587H01M50/578
CPCH01M10/0525H01M10/0587H01M50/578Y02E60/10Y02P70/50
Inventor 韦添运杨俊赵悠曼乔亚非
Owner DONGGUAN CHUANGMING BATTERY TECH
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