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A kind of bipolar electrode sheet and preparation method thereof, and bipolar battery

A bipolar electrode and bipolar technology, used in bipolar electrodes, electrode manufacturing, active material electrodes, etc., can solve the problems of cracking and peeling of thick electrode layers, affecting battery life, and difficulty in controlling the consistency of battery cells. , to increase energy density, avoid coating cracking and peeling off, and facilitate consistency control.

Active Publication Date: 2021-09-24
BEIJING HAWAGA POWER STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the bipolar battery is working at a high rate of current, the consistency problem between the battery cells is more prominent, which will seriously affect the actual service life of the battery, especially when the electrode material layer is very thin, the consistency between the battery cells control will be very difficult
If the thick coating process (such as Chinese patent CN 104241696 A) or the process of layer-by-layer drying of multi-layer coating (such as Chinese patent CN 104600244 A) is simply adopted, it is easy to cause the problem of cracking and falling off of the thick electrode layer

Method used

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  • A kind of bipolar electrode sheet and preparation method thereof, and bipolar battery
  • A kind of bipolar electrode sheet and preparation method thereof, and bipolar battery
  • A kind of bipolar electrode sheet and preparation method thereof, and bipolar battery

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Embodiment 1

[0069] This embodiment provides a porous matrix 1, the porous matrix is ​​made of aluminum mesh, the mesh is square, as shown in Figure 1(b), the porosity of the porous matrix in this embodiment is 30%, and the equivalent pore diameter is 1000 μm.

Embodiment 2

[0071] This embodiment provides a porous substrate, the porous substrate adopts nickel mesh, and the mesh is rectangular, as shown in Figure 1 (c), the porosity of the porous substrate in this embodiment is 90%, and the equivalent pore diameter is 500 μm.

Embodiment 3

[0073] The present embodiment provides a kind of porous substrate, and porous substrate adopts non-woven fabric, and mesh is circular through hole, as shown in Figure 1 (d), the porosity of porous substrate in this embodiment is 70%, and equivalent aperture is 1200μm.

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Abstract

The invention provides a bipolar electrode sheet, at least the positive electrode part of the positive electrode part and the negative electrode part of the electrode sheet is an ultra-thick electrode part, and the ultra-thick electrode part is composed of porous electrode layers with a porous matrix, and the thickness is thinner than that of the traditional electrode sheet. Thickness can increase the energy density of the battery, reduce the manufacturing cost of the battery, and facilitate the consistency control between battery cells. At the same time, the invention also provides a method for preparing bipolar electrode sheets. The method of stacking porous electrode layers can avoid the problem of cracking and falling off of electrode layers caused by layer-by-layer drying of multi-layer coating.

Description

technical field [0001] The invention relates to the field of bipolar batteries, in particular to an ultra-thick bipolar electrode sheet. Background technique [0002] A bipolar battery consists of two unipolar electrode sheets, several bipolar electrode sheets, a separator, and an electrolyte. A bipolar electrode sheet refers to an electrode sheet with two polarities after the positive electrode material layer and the negative electrode material layer are respectively arranged on both sides of the bipolar current collector. The side is provided with a positive electrode material layer or a negative electrode material layer and has a unipolar electrode sheet. Since each battery unit in a bipolar battery is composed of a bipolar plate, a positive electrode material layer, a separator, a negative electrode material layer and another bipolar plate, it has an independent electrochemical structure. The number of battery cells is increased to increase the overall voltage of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/04
CPCH01M4/02H01M4/04H01M10/0418H01M2004/029Y02E60/10Y02P70/50
Inventor 陈永翀张艳萍何颖源张晓虎刘昊
Owner BEIJING HAWAGA POWER STORAGE TECH
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