Li-ion battery with high rate discharge performance

Abstract

The invention discloses a lithium-ion battery with high-rate discharge performance, which comprises a casing, an electric core located in the casing, an upper cover plate and a lower cover plate. The negative pole piece and the diaphragm of the tab are made by one of the winding method and the stacking method, and it is characterized in that: a positive pole tab clamping mechanism and a negative pole tab clamping mechanism are also provided, and the positive pole tab is accommodated and fixed on the The inside of the positive pole lug clamping mechanism, the positive pole lug clamping mechanism outside is provided with a positive pole stud, the positive pole stud is detachably connected with the upper cover, the negative pole lug is stored and fixed inside the negative pole lug clamping mechanism, the negative pole lug A negative pole stud is arranged on the outer side of the clamping mechanism, and the negative pole stud is detachably connected with the lower cover plate. The invention is especially suitable for the fields of electric motorcycles, electric taxis, electric buses, etc., and meets the requirements of high-rate discharge performance of the battery under harsh conditions such as climbing, instant start, and instant acceleration.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery with high-rate discharge performance. Background technique [0002] In recent years, with the popularization and wide application of various portable electronic products, as the driving power of these products, lithium-ion batteries have excellent characteristics of low self-discharge rate, good cycle performance, and small self-discharge, and have been rapidly developed and applied. . In particular, the 18th National Congress of the Communist Party of China included "green development" and "beautiful China" in the report, vigorously promoted the development of circular economy, actively advocated ecological civilization, and built a resource-saving and environment-friendly society. [0003] Lithium-ion secondary batteries are non-polluting, zero-emission, and recyclable, and are gradually being applied to traditional automobile manufacturing, such as motorcycles, t...

AI Technical Summary

Problems solved by technology

[0004] (1) The electrode sheet generally adopts two or more multi-tab designs, or the electrode sheet peripheral metal foil designed by the lamination process is punched out as the tab. The manufacturing process is more complicated, and the wear of the mold The rate also increased at the same time;

[0005] (2) The internal resistance of the battery cannot meet the requirements of the product due to weak welding or weak welding, so it can only be downgraded or scrapped;

[0006] (3) Increase the positive and negative tab leads to improve the rate discharge performance of the battery, but in the case of bad road conditions, frequent starting and acceleration in rugged mountain roads or urban traffic, the battery needs to meet the performance of higher rate discharge Requirements, at this time, some batteries with lower or lower rates will lead to ramp breakdown, over-current protection, and even serious traffic accidents

[0008] The batteries produced by the above two production processes through tab welding or lamination process meet the rate discharge performance requirements to a certain extent, but in the design of high-capacity, high-rate batteries, especially power batteries, are used in urban public transportation, In the bus and other fields, through the way of multi-terminal lead-out and multi-layer metal foil (also called current collector) superimposed welding lead-out, the battery cells in the battery are prone to movement during shaking, dropping, and bumping tests, resulting in dislocation and failure. Cause internal short circuit of the battery, and at the same time, the battery cell is also very easy to pull the tabs during the shaking and bumping process, resulting in the phenomenon of tearing or breaking the tabs, resulting in the occurrence of a short circuit. Therefore, it must be effectively avoided in the structural design to prevent such security risks

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