High-capacity battery and manufacturing method thereof

Abstract

The invention relates to a high-capacity battery and a manufacturing method thereof, and belongs to the technical field of batteries. The battery comprises an aluminum shell, a cylindrical roll core,a positive electrode cover plate, a negative electrode cover plate, a positive electrode confluence sheet, a negative electrode confluence sheet, a silica gel sheet and a battery support, and the cylindrical roll core is composed of a roll core body and a metal cylinder tube and is of a tab-free structure; the cylindrical roll core is arranged in the aluminum shell, and the positive end and the negative end of the cylindrical roll core are welded with the positive and negative confluence sheets to form a roll core group; and the positive electrode confluence sheet is welded with the metal cylinder tube at the positive electrode end of the cylindrical roll core. The cylindrical roll core is accommodated by adopting the metal tube with high thermal conductivity and high electric conductivity, so that the heat dissipation performance of the single roll core is greatly improved; the rate capability of a single roll core is improved through a tab-free end face welding process; through pairwise welding between the outer shell and the metal cylinder tube and between the metal cylinder tube and the positive electrode end face confluence sheet, an overall high-thermal-conductivity and high-electric-conductivity network is realized, the internal resistance of the battery is reduced, the heat dissipation performance and the rate capability of the whole high-capacity battery are improved,and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to a large-capacity battery and a manufacturing method thereof, belonging to the technical field of batteries. Background technique [0002] In existing lithium battery applications, the use of large-capacity batteries is often involved. It is well known that compared with small-capacity batteries, the processing technology of large-capacity batteries is more difficult, the yield is low, and the cost is high. Due to the large size of the high-capacity battery, there will be problems such as large surface expansion, difficulty in heat dissipation, poor rate performance, short cycle life, and poor safety during use. [0003] Therefore, some people combine a number of small-capacity batteries in parallel to form a large-capacity battery. The gap and tightness of core and pole piece are uniform, and the production efficiency is high. The winding core auxiliary module can support and protect the winding core, improving the mechanica...

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Problems solved by technology

However, the brackets used in the above three patents to fix the winding core or the auxiliary modules are all materials with poor insulation and thermal conductivity, and the heat dissipation is even worse than that of ordinary large-capacity batteries, which cannot achieve the purpose of improving heat dissipation, rate performance and life.

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