Safe coiling type lithium battery

Abstract

The invention relates to the technical field of lithium batteries, in particular to an improvement of a pole ear leading-out structure of a coiling type lithium battery. The safe coiling type lithiumbattery comprises a battery casing; a coiling core is arranged in the battery casing, wherein the coiling core is formed in such a way that a positive pole carbon piece and a negative pole lithium piece are isolated by a membrane barrier and are mutually coiled; the coiling core and a battery explosion-protection bottom are provided with bottom membranes, the lower end of the battery casing and anexplosion-protection valve are sealed by welding, a four-fluorine cover membrane is arranged between the coiling core and a cover cap, the upper end of the battery casing and the cover cap are sealedby welding, a negative pole leading-out pole ear and a positive pole leading-out pole ear of the battery are respectively led out to both ends of the battery, the positive pole leading-out pole ear which is led out from a current collection body of the positive pole carbon piece is connected with a positive pole column arranged on the cover cap, and the negative pole leading-out pole ear which isled out from the negative pole lithium piece is connected with the battery casing at the lower end of the battery. The structure can enable the battery to have stable internal structure and dispersive heat source, realize the favorable opening of the explosion-protection valve and the internal pressure balance of the battery and enhance the safety of the battery obviously.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to the improvement of the lead-out structure of the electrode tabs of the wound lithium battery. Background technique [0002] Lithium battery is a new generation of chemical power source that stood out in the 1990s. Because of its excellent electrochemical performance and non-polluting characteristics, it has become an ideal supporting power source for a variety of advanced portable electronic products. Research on large-capacity lithium-ion power batteries Originated around 1995, it is mainly used in aerospace and electric vehicles. [0003] Safety is one of the important technical indicators of the lithium battery. In order to ensure the safety of the battery, a management circuit is usually installed outside the lithium battery to manage the usage of the lithium battery. Generally, the operating state of the battery is monitored by adding a protection circuit outside ...

AI Technical Summary

Problems solved by technology

[0006] 1. The positive and negative lead-out lugs are on the upper end of the battery. If the positive lead-out lug is too long, the upper end of the battery case will be easily in contact with the negative lead-out lug on the same side after crimping the upper end of the battery case. Therefore, there is a potential short circuit; In particular, it is also difficult to realize multi-electrode current collection from the structure of this extraction method;

[0007] 2. When the battery is short-circuited or discharged with a large current, the positive and negative terminals, one of the main heat sources inside the battery, are concentrated on the battery cap end, which will easily lead to uneven heat inside the battery, local overheating, and loss of battery internal pressure. stability, thus affecting its safety performance

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