Battery current collector and lithium battery

Abstract

The invention provides a battery current collector, which comprises an upper surface and a lower surface, the upper surface and the lower surface are planes, the upper surface and the lower surface are crossed, or the extension surface of the upper surface and the extension surface of the lower surface are crossed. The current collector structure is applied to the lithium battery, the lithium battery tab is arranged at the thicker end. The closer the current collector is to the tab, the smaller the resistance is, and the increase of current collection is reduced, so that the heat generated bythe resistance is reduced, the control on the heat generation of the current collector is realized, and the safety performance of the lithium battery is further improved; besides, due to the gradientchange structure of the thickness of the current collector, the mass of the current collector can be reduced, the specific energy of the lithium battery can be improved, and the battery current collector has great advantages especially for large-size lithium batteries.

Description

【Technical field】 [0001] The invention relates to the technical field related to battery collectors, in particular to a battery collector and a lithium battery. 【Background technique】 [0002] At present, the thickness of the known lithium battery positive electrode collector, negative electrode collector, positive electrode coating, and negative electrode coating is uniform. The working current is equal. However, due to the superposition effect of the current and the limited number of tabs, the current concentration increases in the area close to the tab, which makes the heat generated by the current resistance near the tab higher than other areas, which is very easy to cause danger. 【Content of invention】 [0003] Aiming at the technical problem existing in the prior art that lithium batteries are prone to heat generation at the local position of the current collector, especially near the tabs, the present invention provides a battery current collector. The thickness of...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problem existing in the prior art that lithium batteries are prone to heat generation at the local position of the current collector, especially near the tabs, the present invention provides a battery current collector. The thickness of the current collector has a gradient change, which can avoid local overheating. The problem is to reduce the heat generated by the resistance and realize temperature balance control. In order to achieve the above object, the technical solution of the present invention is as follows:

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