High-temperature insulating coating for battery and preparation method thereof

A high-temperature insulation and coating technology, applied in the direction of conductive coatings, secondary batteries, battery pack components, etc., can solve the problems of high initial internal resistance, reduced performance, temperature sensing time difference, etc., to achieve superior safety performance, increased internal resistance, Responsive Effects

A high-temperature insulation and coating technology, applied in the direction of conductive coatings, secondary batteries, battery pack components, etc., can solve the problems of high initial internal resistance, reduced performance, temperature sensing time difference, etc., to achieve superior safety performance, increased internal resistance, Responsive Effects

CN112063245APending Publication Date: 2020-12-11惠州市冠业新材料科技有限公司
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  • High-temperature insulating coating for battery and preparation method thereof
  • High-temperature insulating coating for battery and preparation method thereof
  • High-temperature insulating coating for battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] Specifically, the present application also provides a method for preparing a high-temperature insulating coating, comprising the following steps:

[0054](1) Mix the components in the first dosing with organic solvent or water in proportion and stir to obtain dosing A; mix the components in the second dosing with organic solvent or water in proportion and put into nano After grinding in the grinder, the formulation B is obtained;

[0055] (2) Mix the formulation A and the formulation B, and obtain the formulation C after stirring;

[0056] (3) Mix the formulation C and the binder in proportion to obtain the coating.

[0057] Further, the organic solvent can be esters, including ethyl acetate, butyl acetate, etc.; can be alkanes, including methane, ethane, propane, butane, pentane, etc.; can be alcohols, including methanol, ethanol, Isopropanol, n-butanol, etc.

Embodiment 1

[0061] Prepare the raw materials of each component according to the following proportions:

[0062] (1) 1% expanded particles, 0.1% particle dispersant, 80% graphite component, 6% conductive agent, 2.9% graphite dispersant, and 10% binder;

[0063] (2) 5% of expanded particles, 1% of particle dispersant, 60% of graphite component, 7% of conductive agent, 7% of graphite dispersant, and 20% of binder;

[0064] (3) 10% of expanded particles, 2% of particle dispersant, 40% of graphite component, 8% of conductive agent, 10% of graphite dispersant, and 30% of binder;

[0065] The above expansion particles adopt EM504;

[0066] The specific operation steps are:

[0067] (1) Mix the expanded particles and the particle dispersant with the organic solvent, and stir to obtain the formulation A; mix the graphite component, the graphite dispersant, and the conductive agent in the organic solvent, and put them into a nano grinder for grinding, and the grinding time For 8 hours, after gri...

Embodiment 2

[0072] Refer to the proportioning in Example 1, and replace the expanded particle EM504 with EHM302, and refer to the specific operation method in Example 1 to obtain the variation of the surface internal resistance with temperature under different additions of the expanded particle EHM302. For details, please refer to see image 3 .

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Abstract

The invention discloses a high-temperature insulating coating for a battery and a preparation method of the high-temperature insulating coating, and relates to the technical field of lithium ion batteries. The high-temperature insulating coating comprises a third prepared solution and a binder; the third prepared solution comprises a first prepared solution containing expanded particles, and a second prepared solution containing a graphite component, wherein the graphite component is graphene or graphite. The mass percentage of the expanded particles, the graphite component and the binder is as follows: 1%-15% of the expanded particles; 40%-90% of the graphite component; 8%-30% of the binder. The polymer expansion material and graphene are creatively combined and applied to a battery coating, the characteristics of the polymer expansion material and graphene are fully utilized to realize automatic control of the heat of a battery, and therefore, the reaction to the internal temperatureof the battery is more sensitive, the safety performance is more excellent; and besides, a normal electric path in a normal temperature state is also considered, so that the service life of the battery is prolonged; and daily normal use is not influenced.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a high-temperature insulating coating for batteries and a preparation method thereof. Background technique [0002] The main direction of development of lithium-ion batteries, especially vehicle batteries, is to maximize the energy storage effect and shorten the charging time in a limited space, that is, to increase the unit energy density and speed up the charging efficiency. [0003] Among them, the improvement of unit energy density can be divided into two main directions, one is to seek materials for high-voltage platforms, which may have problems such as high internal resistance and structural instability; the other direction is to change the proportion of electroactive materials. Ratio or adjust the battery space structure, through the adjustment of the ratio is mainly to reduce the thickness of the current collector, but the conductive cross-section...

Claims

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Application Information

Patent Timeline
11 Dec 2020
Publication
CN112063245A
IPC
C09D133/02; C09D109/06; C09D175/04; C09D7/61; C09D7/63; C09D7/65; C09D5/24; C09D5/25; H01M2/34; H01M10/0525
CPC
C08K2201/001; C08K2201/005; C08L2201/08; C08L2203/20; C09D5/00; C09D5/24; C09D109/06; C09D133/02
Inventors
刘俊兴; 崔祺