Bipolar cell stack
A bipolar battery and polarity technology, which is applied in secondary battery manufacturing, battery pack components, large flat batteries/batteries, etc., can solve the problems of battery unit sealing, liquid injection and exhaust, and achieve simplified injection Liquid and sealing process to ensure the effect of liquid blocking
Active Publication Date: 2021-10-29
BEIJING HAWAGA POWER STORAGE TECH
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AI Technical Summary
Problems solved by technology
[0003]
However, in bipolar batteries, there are still many problems in the battery stack formed by stacking battery cells in terms of liquid injection, aging exhaust, and sealing between battery cells.
Especially when the distance between two adjacent current collectors in the battery cell is small, it brings great difficulties to the sealing, liquid injection and exhaust of the battery cell
Method used
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Embodiment Construction
[0051] The present invention will be further described through embodiments below in conjunction with the accompanying drawings.
[0052] figure 1 is a schematic cross-sectional view of the bipolar battery stack according to the first embodiment of the present invention. The electrode sheets of the bipolar battery stack include two unipolar electrode sheets 1 located on the upper side and the lower side, and a plurality of bipolar electrode sheets 2 located between the two unipolar electrode sheets 1 . In the bipolar electrode sheet, the positive electrode material layer and the negative electrode material layer are respectively coated on both sides of the bipolar electrode sheet, thereby forming a coating area coated with an electrode material layer and a coating area on both sides of the bipolar electrode sheet. An uncoated area that is not coated with a layer of electrode material. In the unipolar electrode sheet, a positive electrode material layer or a negative electrode...
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Abstract
The invention provides a bipolar cell stack, and in each cell unit, upper and lower adjacent current collectors respectively comprise a coating area coated with an electrode material layer and a non-coating area which surrounds the periphery of the coating area and is not coated with the electrode material layer. And a completely non-sealed non-sealing part or a partially sealed sealing part and a partially non-sealed non-sealing part can be arranged on a circle of position along the periphery of the non-coating area. Liquid injection, liquid supplement or exhaust can be carried out on each battery unit and even the whole bipolar battery stack through the non-sealing part. A liquid storage part surrounding a sealing part and a non-sealing part is formed by adopting an interlayer capillary force liquid absorption mode, and a liquid-free short-circuit prevention part is formed at the periphery of the liquid storage part by adopting an edge purging mode, so that the cell stack can be in a rich liquid state while liquid injection, liquid supplement and exhaust of the cell stack are ensured, and liquid seal of a cell unit is formed by utilizing the liquid storage part; and the insulation between the battery cells is ensured by using the anti-short-circuit part.
Description
technical field [0001] The invention relates to the field of batteries, in particular to a bipolar battery stack. Background technique [0002] The battery stack of 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 coating a positive electrode material layer and a negative electrode material layer on both sides of a bipolar current collector. A unipolar electrode sheet refers to an electrode sheet on the side of a unipolar current collector. Electrode sheet with unipolarity after coating positive electrode material layer or negative electrode material layer. Since the battery cells of a bipolar battery stack are composed of a current collector, a positive electrode material layer, a separator layer, a negative electrode material layer, and another current collector, each battery cell is an independent electrochemical ...
Claims
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IPC IPC(8): H01M10/04H01M50/609H01M50/184
CPCH01M10/0418Y02P70/50Y02E60/10
Inventor 赵慧永朱峰张永明张彬陈永翀
Owner BEIJING HAWAGA POWER STORAGE TECH