An integrated bipolar electrode and battery stack

By using integrated bipolar electrodes in the power battery pack and using a composite frame structure of a metal matrix and a plastic frame, the problems of electrolyte passing through and partial perforation of the electrode sheet are solved, and the effective utilization rate and safety of the battery are improved.

CN113937247BActive Publication Date: 2025-03-28WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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Patent Information

Application Number
CN202111223635.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-10-20
Publication Date
2025-03-28
Estimated Expiration
2041-10-20

AI Technical Summary

Technical Problem

The bipolar electrode sheets of existing magnification power battery packs are prone to short-circuit problems caused by electrolyte passing through, leakage between monomers and partial perforation of the electrode sheet in high-temperature environments, resulting in a decrease in the effective utilization rate of the battery and an increase in safety risks.

Method used

An integrated bipolar electrode is adopted to form an integrated composite frame through molding, injection molding or nanoforming technology of the metal matrix and the plastic frame. Combining metal foil with good conductivity and a plastic frame with high insulation, an electrolyte inlet and outlet runner and sealing tank are set up to ensure that the electrolyte does not leak out.

Benefits of technology

The isolation of the electrolyte between the monomers is achieved, the leakage of the battery stack is reduced, the effective utilization rate of the electrode material is improved, and the specific energy and safety of the battery are enhanced.

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Abstract

The invention discloses a novel integrated bipolar electrode, comprising an integrated composite frame, a positive electrode, a negative electrode, and a sealing layer between the composite frames, wherein the composite frame integrates a metal substrate and a frame plastic, wherein the positive electrode is arranged on one side of the metal substrate, and the negative electrode is arranged on the other side of the metal substrate, and the sealing layer between the composite frames is arranged between adjacent integrated bipolar electrodes to prevent leakage of electrolyte; a battery stack is also disclosed; the composite frame of the invention has the functions of both a metal substrate and a frame, and fully combines the insulation of plastic polymers with the conductivity of metals, and the connection position is very firm, has no gaps, and has good sealing performance, and can completely prevent the electrolyte from being connected between adjacent single cells, thereby solving the problem of a sharp increase in leakage caused by the electrolyte connection between single cells at the end of discharge in the prior art, thereby improving the utilization efficiency of active substances, reducing the weight of the battery, and improving the battery specific energy.
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