Pole piece

Abstract

The invention relates to a pole piece. The pole piece comprises a current collector and a coating layer, the current collector is coated with the coating layer, and the pole piece is characterized inthat a fiber grating temperature sensor is arranged on the current collector, and is pre-arranged in the pole piece through the coating layer. The pole piece can realize real-time monitoring of the temperature in an electrical core and timely reflects the operating temperature of a battery, enhances the usage security of the battery, and makes response measures for thermal runaway events of the battery.

Description

(1) Technical field [0001] The invention relates to a pole piece, in particular to a pole piece with a built-in fiber grating temperature sensor. (2) Background technology [0002] Lithium batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also widely used in electric vehicles, In terms of large and medium-sized electric equipment such as electric bicycles and electric tools, the performance requirements of lithium-ion batteries are getting higher and higher. The internal structure of a lithium battery is composed of positive and negative electrode sheets and a separator. The battery will generate a lot of heat during use, which will affect the cycle life and safety of the battery, especially for large-capacity batteries. Real-time monitoring of lithium batteries The internal temperature change can...

AI Technical Summary

Problems solved by technology

In the prior art, a temperature sensor is installed at the tab of the cell or between the tab and the cell, or between the cell and the casing to monitor the change of the battery temperature. However, this has nothing to do with the heating source of the cell. There will be some lag in the real situation of temperature changes