Improved button cell

Abstract

The invention relates to a button cell which comprises an integrated cathode cover formed by integrating a seal ring on a cathode cover, an anode cover buckled with the integrated cathode cover in a mutual isolation mode and a cell assembly arranged between the anode cover and the integrated cathode cover, wherein the seal ring comprises an upper side face and a first annular groove, the upper side face of the seal ring is matched with the purfle of the anode cover, the first annular groove is arranged around the cathode cover, and the second annular groove is arranged on the lower side of the underside of the inside of the anode cover coupled with the first annular groove and surrounding the seal ring. By arranging the annular groove in the upper side face of the seal ring, the invention enables the seal ring material to deform towards the inside of the annular groove in the assembling process of the integrated cathode cover and the purfle of the anode cover, thereby preventing the outer surface of the cathode cover, a cell carbon block and a steel mesh from deforming, improving the appearance quality of the cell and ensuring the stable internal resistance of the cell; and by arranging the annular groove in the lower side face of the seal ring, the invention decreases the area of the contact surface for the press fit between the lower side face of the seal ring of the integrated cathode cover and the bottom of the inner side face of the anode cover, thereby increasing the pressure on the contact surface of the lower side face of the seal ring, enabling the seal ring to be subject to greater deformation and ensuring more reliable seal.

Description

technical field [0001] The invention relates to a battery, in particular to a button battery. Background technique [0002] The sealing of the positive cover and the negative cover of the button battery is completed by the sealing ring. When assembling the button battery, the sealing ring and the flanging of the negative cover need to be assembled together first, and then the positive cover is press-fitted with the pressure equipment. Cooperate to achieve sealing. Since the flange assembly of the sealing ring and the negative electrode cover is difficult and takes a long time, it becomes the main factor affecting the productivity of the button battery. In order to solve this problem, an integrated negative electrode cover with a sealing ring formed on the negative electrode cover appeared, so that the steps of flange assembly of the sealing ring and the negative electrode cover were omitted during the assembly of the button battery, and the productivity of the button batter...

AI Technical Summary

Problems solved by technology

[0004] 1. When the button battery is assembled, the flange 21 of the positive electrode cover 20 is tightly pressed on the upper end of the integrated negative electrode cover sealing ring 30. Since the sealing ring 30 is closely attached to the negative electrode cover 10, the material of the sealing ring has nowhere to escape after being deformed under pressure. Thereby, the assembly pressure of the flange 21 is transferred to the flange 11 of the negative electrode cover 10, causing the external shape of the negative electrode cover to be deformed, and the surface quality of the battery is reduced; at the same time, the flange 11 of the negative electrode cover is deformed inwardly under pressure, resulting in carbon cakes 40, The steel mesh 50 is compressed and deformed, and in severe cases, even the carbon cake and the steel mesh are crushed, the contact between the steel mesh 50 and the inner surface of the positive electrode cover 20 is poor, the internal resistance of the battery increases, the internal consumption of the battery increases, the output power decreases, and the battery life is reduced ;

[0005] 2. The lower side of the integrated negative electrode cover sealing ring and the inner bottom surface of the positive electrode cover have a large contact area, and a large assembly pressure is required for assembly to ensure reliable sealing; and during assembly, the sealing ring 30 is affected by the positive electrode. The oppression of the cover flange 21, the material has no place to avoid, resulting in the overall deformation of the sealing ring, and the gap 22 between the sealing ring and the positive cover, resulting in the leakage of the positive cover of the battery

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