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Bipolar current collector and fabrication method thereof

A current collector and bipolar technology, which is applied in the field of bipolar current collector and its preparation, can solve the problems of inability to be ultra-thin, increase the difficulty of batteries, and increase the surface, so as to improve production efficiency and production quality, and the preparation method is simple The effect of efficient and rapid mass production

Inactive Publication Date: 2018-08-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal foil, especially aluminum foil, is calendered, and the thickness cannot be made ultra-thin. Even if it is ultra-thin, the surface will increase, resulting in micropores, resulting in electrolyte leakage
Therefore, light weight and flexibility cannot be achieved
Publication No. CN104577132A patent uses a patterned bipolar current collector, but the process itself is complicated, which increases the difficulty of making subsequent batteries
And the reduced energy density of the final battery is not conducive to subsequent mass production

Method used

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  • Bipolar current collector and fabrication method thereof
  • Bipolar current collector and fabrication method thereof

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Embodiment 1

[0022] see figure 1 , in an embodiment of the present invention, a bipolar current collector includes a polymer intermediate layer 1 made of ethylene phthalate (PET), the thickness of the intermediate layer 1 is 8 μm, and the first The metal layer 2 is a metal layer made of aluminum with a thickness of 1 μm, and the second metal layer 3 on the other side of the middle layer 1 is a metal layer made of copper with a thickness of 1 μm.

[0023] In the preparation process, the polymer intermediate layer 1 made of ethylene phthalate (PET) material with a coil structure is first selected, and then passed through the intermediate layer 1 into the vacuum environment through the roll-to-roll equipment, and the vacuum degree of the vacuum environment is not higher than 10 -4 Pa, after the middle layer is placed in a vacuum environment, the aluminum is evaporated by heating to obtain gaseous metal aluminum, and then the gaseous metal aluminum is deposited on the side of the middle layer...

Embodiment 2

[0025] see figure 2 , in an embodiment of the present invention, a bipolar current collector includes a polymer intermediate layer 1 made of ethylene phthalate (PET), the thickness of the intermediate layer 1 is 6 μm, and the first The metal layer 2 is a 1 μm thick aluminum metal layer, and the other side of the middle layer 1 is provided with a second metal layer 2. The second metal layer 2 includes a 50 nm thick nano-nickel layer and a 1 μm thick metal layer arranged outside the nano-nickel layer. copper layer.

[0026] In the preparation process, the polymer intermediate layer 1 made of ethylene phthalate (PET) material with a coil structure is first selected, and then passed through the intermediate layer 1 into the vacuum environment through the roll-to-roll equipment, and the vacuum degree of the vacuum environment is not higher than 10 -4 Pa, after the middle layer is placed in a vacuum environment, the aluminum is evaporated by heating to obtain gaseous metal alumin...

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Abstract

The invention discloses a bipolar current collector. The bipolar current collector comprises an intermediate layer, a first metal layer and a second metal layer, wherein the first metal layer and thesecond metal layer are arranged at two sides of the intermediate layer, the intermediate layer is a polymer layer, the first metal layer is of an aluminum material structure, and the material of the second metal layer is one or two of copper and nickel. The bipolar current collector has the beneficial effects of simple structure, the current collector is internally insulated, the application safety of the battery unit is ensured; meanwhile, the current collector is ultrathin in structure, is more light and is high in flexibility; and moreover, the fabrication method of the current collector issimple and efficient, rapid mass production can be achieved, thus, the production efficiency and the production quality of the current collector are improved, and the production benefit is improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a bipolar current collector and a preparation method thereof. Background technique [0002] A bipolar battery refers to a bipolar electrode that is coated with lithium-ion battery active materials of different polarities on both sides of the current collector, and the internal structure is connected in series by stacking to obtain a high-voltage battery. This type of battery has the characteristics of high energy density and strong overcurrent capability. To make this type of battery, there must first be a bipolar current collector, which must be resistant to oxidation on one side and resistance to reduction on the other. And it must also ensure that the battery cell is electrically conductive while the current collector is insulated inside, and the electrolyte will not penetrate in the middle, otherwise it will be short-circuited from the inside. [0003] The current b...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/058
CPCH01M4/661H01M4/667H01M10/058Y02E60/10Y02P70/50
Inventor 许涛王晨旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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