Insulating heat-conducting coating of lithium ion battery pole piece and preparation method of insulating heat-conducting coating

A lithium-ion battery, insulation and heat conduction technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of thermal runaway, easy shrinkage of the diaphragm, easy to cause danger, etc., to prevent internal short circuits and reduce safety. effect of risk

Inactive Publication Date: 2021-04-23
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the lithium-ion battery is overcharged, the internal temperature of the battery rises rapidly, and the diaphragm is easy to shrink at high temperature, causing the positive and negative electrodes to contact and internal short circuit, causing thermal runaway and causing danger
During fast charging, the temperature at the tabs is too high, and it is necessary to dissipate the heat at the tabs quickly, otherwise it will easily lead to danger
In addition, the metal straps of the tabs also risk piercing the septum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] An insulating and heat-conducting coating of a lithium-ion battery pole piece and a preparation method thereof, wherein the insulating and heat-conducting coating includes an insulating and heat-conducting material, an adhesive, and a dispersant, and the preparation method comprises the following steps:

[0017] S1: Evenly mix the insulating and heat-conducting material, adhesive, dispersant and deionized water to prepare the insulating and heat-conducting slurry, and set aside;

[0018] S2: Weld the coated, rolled, and slit positive electrode piece to the positive tab, and then spray the insulating and thermally conductive paste prepared in S1 on the surface of the tab below the positive tab glue and the tab empty foil where it was, then dry.

[0019] The insulating and heat-conducting material is one or more of aluminum nitride, boron nitride, silicon nitride, aluminum oxide, magnesium oxide, and zinc oxide.

[0020] The adhesive is one or more of polyurethane emulsi...

Embodiment 1

[0026] S1: Evenly mix 80% insulating and heat-conducting material, 15% adhesive, 5% dispersing agent and deionized water to prepare insulating and heat-conducting paste, set aside;

[0027] S2: Weld the coated, rolled, and slit positive electrode piece to the positive tab, and then spray the insulating and thermally conductive paste prepared in S1 on the surface of the tab below the positive tab glue and the tab empty foil where it was, then dry.

Embodiment 2

[0029] S1: Evenly mix 70% insulating and heat-conducting material, 25% adhesive, 5% dispersant and deionized water to prepare insulating and heat-conducting paste, and set aside;

[0030] S2: Weld the coated, rolled, and slit positive electrode piece to the positive tab, and then spray the insulating and thermally conductive paste prepared in S1 on the surface of the tab below the positive tab glue and the tab empty foil where it was, then dry.

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Abstract

The invention discloses an insulating and heat-conducting coating of a lithium ion battery pole piece and a preparation method of the insulating and heat-conducting coating. The insulating and heat-conducting coating comprises an insulating and heat-conducting material, an adhesive and a dispersing agent. The preparation method comprises the following steps of: S1, preparing insulating heat-conducting slurry; and S2, preparing an insulating heat-conducting coating through spraying. According to the insulating heat-conducting coating of the lithium ion battery pole piece and the preparation method of the insulating heat-conducting coating of the invention, the insulating heat-conducting coating is prepared for the surface of a positive tab and an empty foil welded on the tab, so that the metal burrs of the tab are prevented from piercing a diaphragm to cause short circuit; meanwhile, internal short circuit caused by the contact of a positive electrode and a negative electrode due to thermal shrinkage of the diaphragm is prevented; in addition, the heat at the tab can be quickly dissipated, so that the safety risk of the lithium ion battery is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an insulating and heat-conductive coating for pole pieces of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in the 3C consumer market and the field of new energy vehicles due to their high energy density, high output voltage, long service life, no memory effect, and environmental protection. However, with the demand for high energy density, high power density and super fast charging, the safety of batteries is getting more and more attention. Especially when the lithium-ion battery is overcharged, the internal temperature of the battery rises rapidly, and the diaphragm is easy to shrink at high temperature, causing the positive and negative electrodes to contact and internal short circuit, causing thermal runaway and causing danger. During fast charging, the temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M10/4235Y02E60/10
Inventor 崔日俊李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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