High-rate total-tab type lithium battery and preparation method thereof

Abstract

The invention relates to a high-rate total-tab type lithium battery and a preparation method thereof. The lithium battery comprises a hollow battery housing with openings in the two ends, a battery cell, an upper cover plate assembly and a lower cover plate assembly, wherein the battery cell is arranged in the battery housing, and the upper cover plate assembly and the lower cover plate assembly are arranged at the two ends of the battery housing respectively and seal the openings in the two ends respectively; the upper cover plate assembly comprises a positive pole terminal, and the lower cover plate assembly comprises a negative pole terminal. The battery cell is of a multi-layer winding structure formed by winding a separator, a positive plate, a separator, a negative plate and a separator in sequence; a positive plate electricity storage part coated with positive materials is arranged at one end of the positive plate, and a positive plate blank part is arranged at the other end; anegative plate electricity storage part coated with negative materials is arranged at one end of the negative plate, and a negative plate blank part is arranged at the other end; the positive plate blank part and the negative plate blank part are arranged at the two ends of the battery cell respectively and welded to the two ends to form a positive total tab and a negative total tab respectively.The positive total tab and the negative total tab are connected with the positive pole terminal and the negative pole terminal respectively.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically to a high-rate all-tab type lithium battery and a preparation method thereof. Background technique [0002] With the development of society, the world is particularly concerned about energy crisis and environmental pollution issues, and the exploration of new energy is also continuous, resulting in the vigorous development of the new energy industry. Among them, the lithium battery industry relies on its high energy density, high power density, and recycling. The characteristics of good performance have attracted people's attention and have a wide range of applications in electric (hybrid) vehicles, portable power supplies, energy storage power stations and power grids, and smart homes. In recent years, with the improvement of electric vehicle technology, pure electric or hybrid vehicles are playing an increasingly important role in people’s lives, and people have also ...

AI Technical Summary

Problems solved by technology

Since the positive and negative poles of the monopole lug are on the same side, the current-carrying area is small, resulting in poor overcurrent capability and poor rate performance, and because the monopole lug process requires additional welding of the tab on the pole piece, the process is cumbersome and the production efficiency is low. Low

Although the rate performance of multi-pole tabs is higher than that of single-pole tabs, the positive and negative electrodes are on the same side, the current-carrying area is small, the over-current capability is poor, and the rate performance is not enough to meet the high-rate requirements of electric vehicles; and the multi-pole tab process requires Die-cutting process, many production processes, large investment in equipment, complex process and low efficiency

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