Bipolar structure and battery cell of high voltage battery

Abstract

The invention provides a bipolar structure of a high voltage battery. The bipolar structure comprises a bipolar plate, a positive electrode slurry, a negative electrode slurry, a positive electrode leak-proof porous layer, a negative electrode leak-proof porous layer, and a sealing frame; a positive electrode containing cavity is formed between the positive electrode leak-proof porous layer and the bipolar plate and the positive electrode slurry is contained in the positive electrode containing cavity; and a negative electrode containing cavity is formed between the negative electrode leak-proof porous layer and the bipolar plate and the negative electrode slurry is contained in the negative electrode containing cavity; and the surrounding margins of the bipolar plate, the positive electrode leak-proof porous layer and the negative electrode leak-proof porous layer are sealed by the sealing frame. And besides, the invention further provides a battery cell including the bipolar structure. The bipolar structure and the battery cell provided by the invention avoid the defects of the falling off or loosening of electrode materials bonded on the bipolar plate, and also avoid the defectof internal short circuit caused by tiny holes in a foil current collector, thereby greatly improving the safety performance of the battery.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a high-voltage power lithium-ion battery that can provide energy for pure electric vehicles, hybrid vehicles, electric motorcycles and the like. Background technique [0002] Lithium-ion battery is a new type of high-energy battery with lithium-intercalated compounds as positive and negative electrode materials. Compared with lead-acid batteries and nickel-metal hydride batteries, it has a series of advantages such as high specific energy, high voltage, small self-discharge, good cycle performance and long life. , more and more people's attention, widely used in electric field. [0003] A bipolar lithium battery is a battery module composed of several battery cells stacked and connected in series through a bipolar plate inside the battery. It has the advantages of small resistance energy consumption between battery cells, uniform distribution of electrode surface current and potent...

AI Technical Summary

Problems solved by technology

If the aluminum foil has holes, it will cause the copper foil negative electrode to be continuously oxidized

In addition, because the single cell is very thin, if copper-aluminum composite foil is used, it is easy to cause the edges of the two current collectors to contact, resulting in a short circuit of the battery. The existence of these problems will increase the safety hazard of high-voltage batteries.

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