Cathode current collector and cathode pole piece

Abstract

The invention provides a cathode current collector and a cathode pole piece. The cathode current collector comprises a first metal layer, a fiber braid layer and a second metal layer. The first metallayer, the fiber braid layer and the second metal layer are laminated and covered successively. Through plating the first metal layer and the second metal layer on the fiber braid layer, a composite cathode current collector is acquired. The fiber braid layer is used to reduce the weight of the cathode current collector, increase energy density of a battery core, increase tensile strength of the current collector, improve a battery core manufacturing process capability, and increase a buffer external stress and an effect of attaching to broken metal so as to greatly improve safety performanceof the battery cell.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to cathode current collectors and cathode pole pieces in lithium ion batteries. Background technique [0002] At present, the cathode current collectors of most lithium-ion batteries use metal foils such as aluminum foil. Although these metal foils have good electrical and thermal conductivity, they are prone to generation of Larger metal debris or burrs can pierce the diaphragm and cause an internal short circuit in the cell, which poses a safety hazard. [0003] In order to eliminate potential safety hazards, various safety schemes including safety coatings and organic-metal composite current collectors have been studied. Safety coating refers to coating a layer of insulator on the surface of the battery cathode, anode or separator, which can improve the safety performance by increasing the resistance of the electrode sheet or the mechanical properties of the separator to pre...

AI Technical Summary

Problems solved by technology

However, these thin coatings cannot prevent metal debris or burrs brought by extreme conditions such as punctures and extrusions from piercing the diaphragm, resulting in contact between the cathode and the anode, resulting in an internal short circuit of the battery cell, which is prone to fire and explosion.

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