Lithium battery current collector with temperature sensing function and preparation method thereof

Abstract

The invention provides a lithium battery current collector with a temperature sensing function and a preparation method thereof, and belongs to the technical field of lithium batteries. According to the lithium battery current collector disclosed by the invention, the temperature sensing unit is directly integrated on the surface of the current collector on the basis of the metal foil of the current collector, so that strong adhesive force of an interface between the temperature sensing unit and the metal foil can be ensured; the temperature sensing unit has the characteristics of small size and thin thickness, so that the influence on the battery performance can be reduced to the greatest extent; and besides, the preparation material of the temperature sensing unit has flexibility, so that the sensor is not damaged in the technological processes of coating, winding and the like in the battery preparation process, and the temperature change in the battery under different working conditions can be monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of lithium battery current collector preparation, and in particular relates to a lithium battery current collector with a temperature sensing function and a preparation method thereof. Background technique [0002] In recent years, lithium batteries, as a carrier of clean energy, have been widely used in the field of electric vehicles due to their advantages such as high energy density, excellent cycle performance, low self-discharge rate, clean and pollution-free. However, the high energy density of lithium-ion batteries will cause a sharp rise in the internal temperature of the battery under conditions such as overcharge and overdischarge, mechanical abuse, internal defects, and low-temperature working environments. High temperature will cause problems such as battery expansion, electrolyte decomposition, and current collector decomposition, which will cause serious safety accidents such as spontaneous com...

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Problems solved by technology

But its biggest disadvantage is that the prepared temperature sensor is generally integrated with the prepared lithium battery electrode by bonding, crimping, etc., but the preparation process is complicated and the adhesion at the interface is insufficient. The sensor is easy to separate from the metal foil under such working conditions, which leads to a decrease in the monitoring reliability of the temperature sensor; second, the temperature sensors used are mostly rigid components, which are not suitable for lithium-ion batteries prepared by winding; the third is the temperature The sensor is built on the surface of the current collector, and the characteristic size of the sensor will affect the deintercalation of lithium ions during the charge and discharge process, reducing the capacity of the lithium ion battery and the efficiency of charge and discharge

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