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Conductive coating for battery case as well as preparation method and application thereof

A technology for conductive coatings and battery shells, applied in conductive coatings, battery box/sleeve materials, dry batteries, etc., can solve the problems of decreased battery electrical performance, large battery internal resistance, large self-discharge, etc., to improve discharge performance, increase The effect of collecting current and increasing the contact area

Active Publication Date: 2021-02-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above three published patent documents all have the same problems. Whether it is a conductive agent or a conductive paint, when applied to an alkaline manganese battery, the conductivity is average, and after long-term storage, it is combined with the steel shell in the alkaline electrolyte. Worse, does not stop the diffusion of steel-cased iron
Unable to meet the current demand for a 10-year shelf life in the market
[0007] At present, the conductive agent used in domestic alkaline-manganese batteries is still a general-purpose conductive agent, and the use in alkaline-manganese batteries has the following disadvantages: 1) The coating film resistance of this conductive agent is large, generally greater than 300Ω / film length 5.0cm×width 1.5cm× The thickness is 60μm, and some are as high as several KΩ / film length 5.0cm×width 1.5cm×thickness 60μm. Alkaline-manganese batteries made with it have large internal resistance and low current value for high-power discharge; 2) the coating of this conductive agent The adhesion between the film and the steel shell is generally a physical adhesion, and the adhesion is insufficient, resulting in a large internal resistance of the battery and a low current value for high-power discharge. In addition, the alkaline manganese battery made with this conductive agent has a large self-discharge capacity. It will cause the electrical performance of the battery to decline too quickly during storage

Method used

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  • Conductive coating for battery case as well as preparation method and application thereof
  • Conductive coating for battery case as well as preparation method and application thereof
  • Conductive coating for battery case as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] This embodiment provides a conductive coating for a battery case. The conductive coating is composed of an aqueous emulsion and a conductive functional material, wherein the aqueous emulsion accounts for 84.8% by weight, and the conductive functional material accounts for 15.2% by weight;

[0082] Described aqueous emulsion comprises the following components by weight ratio:

[0083]

[0084] Wherein, the coupling agent is a silane coupling agent, the wetting agent is sodium alkyl sulfate, and the emulsifier is Tween 80.

[0085] The conductive functional material comprises the following components by weight ratio:

[0086]

[0087]

[0088] The conductive paint for battery case provided in this embodiment is obtained by the following preparation method:

[0089] (1) Add polytetrafluoroethylene resin, sodium alkyl sulfate, Tween 80, silane coupling agent and water into a 200L high-speed stirring tank with a dispersing plate and a stirring rod with a volume of ...

Embodiment 2

[0096] This embodiment provides a conductive coating for a battery case. The conductive coating is composed of an aqueous emulsion and a conductive functional material, wherein the aqueous emulsion accounts for 73% by weight, and the conductive functional material accounts for 27% by weight;

[0097] Described aqueous emulsion comprises the following components by weight ratio:

[0098]

[0099] Wherein, the coupling agent is a titanate coupling agent, the wetting agent is a water-based polysiloxane wetting agent, and the emulsifier is n-hexadecyl-n-ethylmorpholino ethyl sodium sulfate.

[0100] The conductive functional material comprises the following components by weight ratio:

[0101]

[0102] The conductive paint for battery case provided in this embodiment is obtained by the following preparation method:

[0103] (1) Add the formula amount of polyvinylidene fluoride resin, water-based polysiloxane wetting agent, n-hexadecyl-n-ethylmorpholino sodium ethyl sulfate, t...

Embodiment 3

[0110] This embodiment provides a conductive coating for a battery case. The conductive coating is composed of an aqueous emulsion and a conductive functional material, wherein the aqueous emulsion accounts for 64% by weight, and the conductive functional material accounts for 36% by weight;

[0111] Described aqueous emulsion comprises the following components by weight ratio:

[0112]

[0113]

[0114] Wherein, the coupling agent is a silane coupling agent, the wetting agent is an aqueous acetylene glycol wetting agent, and the emulsifier is polyoxyethylene monostearate.

[0115] The conductive functional material comprises the following components by weight ratio:

[0116]

[0117] The conductive paint for battery case provided in this embodiment is obtained by the following preparation method:

[0118] (1) Add the formula amount of polyperfluoroethylene propylene resin, water-based acetylene glycol wetting agent, polyoxyethylene monostearate, silane coupling agen...

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PUM

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Abstract

The invention provides a conductive coating for a battery case as well as a preparation method and application thereof. The conductive coating comprises a water-based emulsion and a conductive functional material, wherein the water-based emulsion comprises resin, a coupling agent and an emulsifier. The novel conductive coating is used, so that the contact area of the battery case and the positiveelectrode ring can be increased, the current collection effect and the conductivity are improved, the diffusion of metal elements unfavorable for the battery in the battery case during long-term storage can be effectively reduced, and the long-term storage discharge performance of the alkaline manganese battery is improved; and the liquid leakage rate of the battery after long-term storage is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of alkaline manganese batteries, and relates to a conductive coating for battery shells, a preparation method and application thereof. Background technique [0002] As alkaline-manganese batteries continue to be welcomed by the market as an environment-friendly, high-quality and cheap daily-use commodity, the current market application is broad and the development prospect is good. In recent years, with the advancement of technology and changes in market demand, alkaline manganese batteries require high power discharge and long storage life. The storage life of alkaline manganese batteries required by the market is generally greater than 5 years, and a long shelf life of 10 years is pursued. In the production process of alkaline manganese batteries, the steel shell is used as the container shell and as the current collector of the positive electrode ring (active material manganese dioxide), and the conductiv...

Claims

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Application Information

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IPC IPC(8): C09D127/18C09D127/16C09D5/24C09D7/20C09D7/63C09D7/80H01M50/545H01M50/562H01M50/124H01M6/08
CPCC09D127/18C09D127/16C09D5/24C09D7/20C09D7/63C09D7/80H01M6/08C08K2201/001C08K2201/014C08K2201/011C08K2003/0862C08L2205/02C08K13/02C08K5/54C08K3/042C08K3/04C08K3/041C08K3/08C08K3/00C08K5/10Y02E60/10
Inventor 刘军平
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD