Lithium battery shell, lithium battery positive electrode cover plate and lithium battery

Abstract

The invention relates to a lithium battery shell, a lithium battery positive electrode cover plate and a lithium battery. The lithium battery shell which comprises a cylindrical tube, a positive electrode cover plate and a negative electrode cover plate; the positive electrode cover plate and the negative electrode cover plate can be plugged at the two ends of the cylindrical tube respectively; the cylindrical tube is plugged by the positive electrode cover plate and the negative electrode cover plate to form a containing cavity; and the containing cavity is used for containing a lithium battery cell. The positive electrode cover plate comprises an end cover and a collector plate, and the end cover is fixedly connected with the cylindrical tube; and the collector plate is fixedly connected with the end cover and is arranged on the surface, facing the containing cavity, of the end cover. The lithium battery comprises a lithium battery shell, and a lithium battery cell is arranged in the containing cavity. The positive electrode cover plate is electrically connected with the cylindrical tube, the positive electrode cover plate is simplified to be composed of the end cover and the collector plate, thus, the cost of a finished product is about 1 / 3-1 / 2 of that of an existing positive electrode cover plate, and economic benefits are obvious; and meanwhile, the positive electrode cover plate is directly conducted (electrically connected) with the metal cylindrical tube of the shell, so that the potential difference between the positive electrode of the battery and the metal tube is eliminated, and the electrochemical corrosion effect on the surface of the cylindrical tube is completely eradicated.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and relates to lithium battery packaging technology, in particular to a lithium battery positive electrode cover plate, a lithium battery shell technology and a lithium battery. Background technique [0002] Lithium batteries generally include cells and packaging shells for storing and releasing electric energy. The main task of battery manufacturing is to design appropriate battery shells according to application requirements, and pack the cells into the battery shells to form battery products. [0003] Cylindrical rechargeable lithium battery shells are generally in the form of cylindrical metal tubes with end caps at both ends. The cylindrical metal tubes are generally made of aluminum / aluminum alloy; the main body of the end caps is usually also made of aluminum / aluminum alloy. The electrodes (positive and negative) of the battery are drawn out from the two end caps, which are u...

AI Technical Summary

Problems solved by technology

Since the connection of the power supply line occurs in the use scene, it is separated from the factory environment of battery production, and the controllability is poor

The setting of the safety valve on the cover plate in the existing structure will form exposed metal protrusions, which increases the safety hazards in use, and such safety problems have indeed occurred in use

[0009] ③. The existing safety valve design can only achieve destructive pressure relief after overpressure, and cannot be restored after pressure relief

The important thing is that the hidden danger of overvoltage cannot be discovered in advance, and the destructive pressure relief usually causes secondary dangers due to leaked battery fluid (such as short circuit of the battery pack, etc.)

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