Battery pole piece, preparation method of battery pole piece, and battery

A battery pole piece and battery technology, applied in electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve problems such as battery safety and over-temperature protection that cannot be fundamentally solved, and reduce the probability of thermal runaway. , the effect of increasing internal resistance and high practicability

Pending Publication Date: 2018-03-06
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors of the present invention have found that the essence of lithium-ion battery safety lies in the safety guarantee of the internal materials and structures of the battery itself, while the application of PTC materials in existing batteries is mainly connected to the external circuit of the battery in the form of electronic components. It plays the role of over-temperature protection, which cannot fundamentally solve the problem of battery safety.

Method used

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  • Battery pole piece, preparation method of battery pole piece, and battery
  • Battery pole piece, preparation method of battery pole piece, and battery
  • Battery pole piece, preparation method of battery pole piece, and battery

Examples

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Embodiment 1

[0045] This embodiment provides a battery pole piece, specifically, such as figure 1 and figure 2 As shown, the battery pole piece in this embodiment includes a current collector 1, an active material coating 3 and a PTC material coating 2; wherein, the surface of the current collector 1 includes a first region and a second region; the first region is coated with an active Material coating 3, the second area is coated with PTC material coating 2.

[0046] Here, the battery pole piece provided in this embodiment introduces the PTC material into the electrode material by dividing the surface of the current collector into the first area coated with the active material coating 3 and the second area coated with the PTC material coating 2 In the diaphragm, when the battery temperature is too high, the PTC material coating can increase the internal resistance of the battery in time, reduce the probability of thermal runaway, and improve the safety performance of the battery. In ad...

Embodiment 2

[0056] Preferably, this embodiment is used to prepare the battery electrode sheet preparation method described in Example 1, which mainly includes the following steps:

[0057] 1. Add binder, positive temperature type material, and conductive agent into the set solvent according to the weight ratio of (1-3):(6-9):(1-4) to prepare PTC material slurry.

[0058] Preferably, in this step, the solid content of the PTC slurry is 30-60%. If it is higher than this range, the fluidity of the slurry will be poor, resulting in uneven coating and tailing. If it is lower than this range , the slurry will be too thin, needle-like tailing will appear and the energy density of the battery will decrease. The solvent is set to be an organic solvent; specifically, a volatile solvent, preferably: N-methylpyrrolidone.

[0059] Preferably, the binder is firstly added to the set solvent, and then the positive temperature type material and the conductive agent are added respectively, and after mixin...

Embodiment 3

[0067] This embodiment provides a battery, wherein the battery in this embodiment includes the battery pole piece described in Example 1; and the battery pole piece is prepared by the method described in Example 2. Preferably, the battery in this embodiment is a lithium ion battery.

[0068] The present invention is further described as follows specifically by experimental embodiment below:

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Abstract

The invention relates to a battery pole piece, a preparation method of the battery pole piece, and a battery, and relates to the technical field of batteries. The mainly adopted technical scheme is asfollows: the battery pole piece comprises a current collector, an active material coating and a PTC (positive temperature coefficient) material coating, wherein the surface of the current collector comprises a first area and a second area, the active material coating is coated on the first area, and the PTC material coating is coated on the second area. The preparation method of the battery polepiece comprises the following steps: preparing a PTC material slurry, coating the PTC material slurry on the second area of the current collector, preparing an active material slurry, and coating theactive material slurry on the first area of the current collector. The battery comprises the above battery pole piece. The battery pole piece is mainly used to reduce the probability of thermal runaway occurring when the battery is short-circuited or the temperature is too high, and the safety of the battery is improved.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a battery pole piece, a preparation method thereof, and a battery. Background technique [0002] Due to the advantages of high energy density, long cycle life, high voltage, no memory effect and no pollution, lithium-ion batteries have been widely used in various consumer products. In recent years, due to national policies and market guidance, lithium-ion batteries have Unique advantages quickly occupy the market of electric vehicles and energy storage. However, as the market's requirements for battery energy and power density increase, the safety issues of lithium-ion batteries are becoming more and more prominent. When the battery is short-circuited or overcharged abnormally, the inside of the battery is prone to heat and is accompanied by the generation of a large amount of gas, causing deformation of the battery and even the risk of explosion. [0003] At present, the indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525H01M2200/106Y02E60/10
Inventor 李乾乾段科王晋吉纯魏文飞蒋世用赵志刚
Owner GREE ELECTRIC APPLIANCES INC
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