Button lithium secondary battery

Abstract

The invention relates to the technical field of lithium batteries, in particular to a button lithium secondary battery and a manufacturing method thereof. The button lithium secondary battery comprises a shell, an insulating ring, a battery cell, a thimble and electrolyte, and is characterized in that the shell comprises an upper shell and a lower shell; the upper shell and the lower shell are both metal shells with openings in one side and hollow interiors; the end faces of the upper shell and the lower shell are two poles of the battery; the insulating ring is located between the upper shelland the lower shell; the battery cell is installed in the shell and comprises a first electrode, a second electrode and a diaphragm arranged between the first electrode and the second electrode; thefirst electrode, the diaphragm, the second electrode and the diaphragm are arranged in sequence; and the first electrode, the diaphragm and the second electrode form the battery cell in a winding mode. According to the invention, the thimble is adopted to achieve the effect of electrically connecting the electrode and the shell; the welding procedure of assembly is omitted; the efficiency is improved; the production cost is reduced; the battery performance can be improved; and the cycle life is prolonged.

Description

technical field [0001] The patent of the invention relates to a button-type lithium secondary battery and a manufacturing method thereof, belonging to the technical field of lithium batteries. Background technique [0002] A common button lithium battery is usually composed of two metal shells (upper shell, lower shell), an insulating ring, a first electrode, a second electrode, a diaphragm, and an electrolyte. During the production process of a button lithium battery, The first electrode, the second electrode and the diaphragm are made into a cell by stacking or winding, and the cell is electrically connected to the metal shell, and after the electrolyte is injected, the two metal shells (upper shell, The lower case) is combined and insulated, and finally the battery is formed to complete the button lithium battery production process. [0003] The electrical connection method between the battery core and the metal shell is to lead the two electrodes in the battery core com...

AI Technical Summary

Problems solved by technology

[0003] The electrical connection method between the battery core and the metal shell is to lead the two electrodes in the battery core composition out of the guide handle or metal foil to form an electrode foil, and then electrically connect the electrode foil to the metal of the shell. The most common method to achieve electrical connection is welding, such as resistance welding, laser welding, ultrasonic welding, etc. The welding method needs to align the two materials to be welded and closely fit them, and then perform the welding process. Because many details must be controlled, and when the welding quality is poor, such as over-welding or false welding, it is not easy to screen out defective products 100%

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