Lithium supplementing device and method for lithium ion battery pole piece

Abstract

The invention provides a lithium supplementing device and method for a lithium ion battery pole piece. The lithium supplementing device for the lithium ion battery pole piece comprises an inert gas chamber, the inert gas chamber comprises a cooling chamber and a containing chamber which are arranged in a spaced mode, and the lithium supplementing device for the lithium ion battery pole piece further comprises a lithium liquid supply liquefaction pool, an extrusion spraying device, a first double-roller device, a second double-roller device and a comma roller device which are arranged in the containing chamber. An inner cavity of the lithium liquid supply liquefaction pool is a containing cavity used for containing metal lithium, the containing cavity, the extrusion spraying device, the first double-roller device and the comma roller device are provided with heating structures, and the heating structures are used for melting the metal lithium and better infiltrating the lithium liquid.According to the lithium supplementing device for the lithium ion battery pole piece, the consistency of a lithium supplementing pole piece can be remarkably improved, a lithium supplementing amount and the thickness of the pole piece after lithium supplementing are accurately controlled, the lithium supplementing operation is simplified, the energy density of a lithium ion battery is improved, and the performance of a product is greatly increased.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion batteries, in particular to a lithium-ion battery pole piece lithium replenishing device and a method thereof. Background technique [0002] Lithium-ion batteries have been widely used in the field of energy storage due to their high specific capacity, high voltage, long cycle life, good thermal stability, no memory effect and low environmental pollution, including in some small portable smart devices, It is widely used in the fields of large-scale power vehicles and energy storage devices. With the implementation of the sustainable development strategy of the country, new energy vehicles will become the main force in the supply of lithium-ion batteries, and the requirements for lithium-ion batteries will be higher, that is, high energy density, high endurance and long service life, etc. Therefore, , Improving the energy density of lithium-ion batteries is a widely concerned issue ...

AI Technical Summary

Problems solved by technology

Affected by the surface tension, the device cannot completely infiltrate the molten lithium liquid on the counter roll at the design temperature, so the lithium liquid will be unevenly distributed on the counter roll, thus making the lithium supplemented on the pole piece uneven

In addition, the device cannot accurately control the amount of lithium liquid added, and it is necessary to control the appropriate speed to achieve the distribution of lithium liquid on the counter roll, which is not conducive to operation

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