High-power cylindrical lithium ion battery

Abstract

The invention discloses a high-power cylindrical lithium ion battery. The high-power cylindrical lithium ion battery comprises a shell and a winding core pole group, wherein the winding core pole group is accommodated in the shell and is formed by winding positive pole plates, negative pole plates and separators, at least two positive tabs are arranged on the positive pole plates, at least two negative tabs are arranged on the negative pole plates, the positive tabs and the negative tabs are respectively exposed out of two ends of the winding core pole group, the numbers of the positive tabs and the negative tabs are equal, the positive pole plates and the negative pole plates are arranged at equal distance in a staggered way when the positive pole plates and the negative pole plates are in unfolded states, and one of the positive tab is arranged at a winding end of the positive pole plate in the unfolded state. The positive tabs and the negative tabs are arranged in the staggered way,the distance between the positive pole plates and the negative pole plates is shortened, so that current distribution of the positive pole plates and the negative pole plates is uniform, the impedance is greatly reduced, the battery is difficult to generate heat under high power, the large-power discharging performance of the battery is improved, the battery is low in impedance, good in discharging performance, long in service lifetime and high in safety.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-power cylindrical lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable power sources such as mobile phone batteries and notebook batteries because of their advantages such as high voltage, high specific energy, long life, and environmental protection. With the development of the new energy industry, the requirements for lithium-ion batteries are also increasing. Higher and higher; the current development of power batteries represented by HEV has gradually become a research hotspot of high-power lithium-ion batteries. [0003] In the lithium battery, the positive and negative tabs are respectively connected to the positive and negative tabs for external connection. In the prior art, the structure of the positive and negative tabs mainly has the following two methods: first, as disclosed in the Chinese patent 102104134A...

AI Technical Summary

Problems solved by technology

The above two kinds of positive and negative tabs are set with too large distance between the tabs, and the impedance inside the pole piece is too high. In the state of high power output, the temperature rises obviously, and the temperature rise will directly affect the performance of the battery, and the existence of Certain security risks

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