Nut cap combination for cylindrical batteries and cylindrical secondary battery

Abstract

The invention provides a nut cap combination for cylindrical batteries. The nut cap comprises a top cap, a bottom cap, a blast-proof ball and a cathode connecting member; the blast-proof ball is arranged in a containing space formed between the top cap and the bottom cap, the cathode connecting member is welded to the bottom cap, the top cap penetrates a top cap via hole of the cathode connectingmember centrally, an insulating jacket is matched with a gap between the skirt edge of the cathode connecting member and the bottom cap, and is compressed and tightened with the bottom cap through thecathode connecting member; an anode connecting ring sleeves the middle of the compressed insulating jacket, the edge part of the anode connecting ring is welded with the top of a corresponding steelcase, and the anode connecting ring is used as a welding member and a supporting member of the whole nut cap combination. The invention further provides a cylindrical secondary battery manufactured bythe nut cap combination for cylindrical batteries. The nut cap combination for the cylindrical batteries is simple in structure; the cylindrical secondary battery manufactured with the nut cap combination has the advantages that the service space of the internal cell can be improved, and capacity of the battery can be increased, and safety thereof can be improved.

Description

technical field [0001] The invention relates to a cap assembly for a cylindrical battery and a cylindrical secondary battery. Background technique [0002] As a key component of new energy vehicles, the technical level of power batteries is one of the most critical factors affecting the development of the new energy vehicle industry. However, due to the limited space for battery modules, how to increase the battery capacity per unit volume has become the most important one of the subjects. Existing cylindrical secondary batteries generally include a steel shell, positive and negative electrodes, and a battery core and cap combination formed by winding a diaphragm. The cap combination is formed by a combination of a cap and a sealing ring. The existing cylindrical secondary batteries are generally provided with rolling grooves on the steel shell, and the cap assembly is supported by the rolling grooves, and when the steel shell forms the rolling grooves, the internal space o...

AI Technical Summary

Problems solved by technology

The existing cylindrical secondary batteries are generally provided with rolling grooves on the steel shell, and the cap assembly is supported by the rolling grooves, and when the steel shell forms the rolling grooves, the internal space of the steel shell will be reduced, and The space that the battery can use is only the space between the bottom of the rolling groove and the bottom of the steel case, which reduces the battery capacity per unit volume to a certain extent

Moreover, when the existing cylindrical secondary batteries are connected in series, it is necessary to use the positive connection part in many cases. Extreme phase welding requires multiple welding, and the combination efficiency is low, and this method is easy to increase the internal resistance of the battery, which also increases the space occupied by the battery to a certain extent

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