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Bipolar cell stack

A bipolar battery, bipolar technology, applied in battery pack parts, secondary battery manufacturing, large flat battery/battery, etc., can solve problems such as isolation layer damage, electrode material layer failure, short circuit, etc.

Active Publication Date: 2021-03-05
BEIJING HAWAGA POWER STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure exerted on the upper and lower ends of the bipolar battery stack will cause both the electrode material layer and the separator to bear a large compressive force, which will easily lead to failure of the electrode material layer or damage to the separator, resulting in a decrease in battery performance or a short circuit between the positive and negative electrodes

Method used

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Embodiment Construction

[0053] The present invention will be further described through embodiments below in conjunction with the accompanying drawings.

[0054]Fig. 1 (a)-(b) is the schematic diagram according to the bipolar cell stack of the present invention, wherein, Fig. 1 (a) is the three-dimensional schematic diagram of bipolar cell stack, Fig. 1 (b) is the bipolar cell stack A cross-sectional schematic diagram and a partially enlarged schematic diagram. As shown in the figure, the bipolar battery stack 1 includes a positive electrode sheet 2 on one side, a negative electrode sheet 3 on the other side, and a plurality of bipolar electrode sheets 4 therebetween. The end face positive electrode sheet 2 is provided with an end face positive electrode collector and a positive electrode material layer coated on one side of the end face positive electrode collector. The upper edge of the positive electrode material layer is lower than the upper edge of the end face positive electrode collector. The ...

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Abstract

The invention provides a bipolar cell stack. Each cell unit of the bipolar cell stack is provided with an insulation sealing frame and an isolation supporting frame, and the isolation supporting frameis located on the inner side of the insulation sealing frame. The isolation supporting frame can be hermetically connected between the positive electrode material layer and the negative electrode material layer in each battery unit, or hermetically connected to the bipolar current collector or the end surface current collector in each battery unit, so that an isolation cavity is supported betweenthe positive electrode material layer and the negative electrode material layer in each battery unit. Through the isolation cavity located between the positive electrode material layer and the negative electrode material layer, contact short circuit of the positive electrode material layer and the negative electrode material layer and falling failure of the electrode material layer due to external pressure of the cell stack can be avoided, and the electrolyte stored in the isolation cavity can also ensure that the cell is kept in a rich liquid state. In addition, additional sealing guaranteeis provided through sealing connection between the frame edge of the isolation supporting frame and the electrode material layer / current collector.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a bipolar battery stack. Background technique [0002] The bipolar battery consists of two unipolar electrode sheets (end electrode sheets), several bipolar electrode sheets (intermediate 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 electrode sheet has unipolarity after being provided with a positive electrode material layer or a negative electrode material layer. Since each battery cell composed of bipolar current collector, positive electrode material layer, separator layer, negative electrode material layer and another bipolar current collector inside the bipolar battery has an independent electrochemical structure, it can be obtained by addin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/184H01M50/186H01M10/04
CPCH01M10/0418Y02E60/10Y02P70/50
Inventor 朱峰何颖源韩越张彬王馨陈永翀
Owner BEIJING HAWAGA POWER STORAGE TECH
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