Cylindrical battery

Abstract

Provided is a cylindrical battery, comprising a cylindrical battery electrode assembly which is formed by coiling a positive plate and a negative plate separated by a diaphragm and is coiled on a core bar. The cylindrical battery is characterized in that an inner end face of a positive electrode lead-out terminal located at one end of the cylindrical battery electrode assembly is directly connected with the entire end of the positive plate at the corresponding end of the cylindrical battery electrode assembly, and an inner end face of a negative electrode lead-out terminal located at the other end of the cylindrical battery electrode assembly is directly connected with the entire end of the negative plate at the corresponding end of the cylindrical battery electrode assembly, so that a bus structure is formed in such a manner that the positive and negative electrode lead-out ends are respectively configured at two ends of the battery. In the invention, as the positive and negative electrodes are respectively arranged at two ends of the battery, current of the positive and negative plates flows from the two ends, significantly increasing the high current charge-discharge capability of the battery and effectively improving the performance of heat dissipation in the battery as well as the safety property of the battery.

Description

technical field [0001] The present invention relates to a secondary battery, and further refers to a cylindrical secondary battery. Background technique [0002] At present, due to the global energy shortage and the strengthening of environmental protection awareness, electric vehicle batteries and energy storage batteries are hot in the market, and large-capacity secondary batteries (nickel-metal hydride, nickel-cadmium, lithium batteries, lead-acid, etc.) on the market generally adopt rectangular structures. Especially nickel-metal hydride batteries, which are larger than 20Ah, adopt a rectangular structure. The reason is that it is difficult to dissipate heat inside a large-capacity battery, which is likely to cause thermal runaway. However, the inherent defects of the secondary battery with a rectangular structure cannot fully meet the market demand, and the high-current charge and discharge performance of the existing cylindrical secondary battery and the heat dissipati...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the global energy shortage and the strengthening of environmental protection awareness, electric vehicle batteries and energy storage batteries are hot in the market, and large-capacity secondary batteries (nickel-metal hydride, nickel-cadmium, lithium batteries, lead-acid, etc.) on the market generally adopt rectangular structures. Especially Ni-MH batteries, which are larger than 20Ah, adopt a rectangular structure. The reason is that it is difficult to dissipate heat inside a large-capacity battery, which is likely to cause thermal runaway

However, the inherent defects of the rectangular secondary battery cannot fully meet the market demand, and the high-current charge and discharge performance of the existing cylindrical secondary battery and the heat dissipation performance of the internal heat of the battery need to be improved.

Moreover, the positive and negative electrode sheets of the existing secondary battery are connected to the lead-out ends by welding the tabs, and there are welding points and welded connectors. When the current is high or the battery is short-circuited, the tabs or the connectors will be hot and red. , so as to cause serious safety accidents such as battery burning

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