Method for monitoring surface density of coating quantity of lithium ion battery pole piece

Abstract

The invention discloses a method for monitoring surface density of coating quantity of a lithium ion battery pole piece. In the method, the setting of internal parameters of a coating quantity measuring apparatus are changed by utilizing the functions of the coating quantity measuring apparatus, so that the surface density change of a pole piece base material and the surface density of the coating quantity can be monitored. The parameter setting of the coating quantity measuring apparatus comprises the following steps of: setting a measuring factor as 1 and a measuring constant as 0 and measuring the surface density of the base material by using the coating quantity measuring apparatus to obtain a display value of a; setting the measuring constant as -a and measuring the surface density of the base material by using the coating quantity measuring apparatus to obtain a display value of b; sampling and measuring the surface density c of the actual coating quantity; calculating to obtaina new measuring factor d equal to c / b and a new measuring constant equal to -a / d; resetting a measuring factor as d and a measuring constant as e so as to set the parameters for measuring the surfacedensity value of the base material coating layer. By the method, cost is saved to the maximum extent, the change of the surface density of the pole piece base material can be monitored in real time, and the variation value of the surface density of the coating quantity can be displayed accurately.

Description

technical field [0001] The invention relates to a method for monitoring the coating amount of battery pole pieces. In particular, it relates to a method for monitoring the areal density of the coating amount of a pole piece of a lithium ion battery capable of monitoring changes in the areal density of a pole piece base material in real time. Background technique [0002] Lithium-ion 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 laptop computers, but also widely used in electric vehicles, electric In terms of large and medium-sized electric equipment such as bicycles and electric tools, the performance requirements of lithium-ion batteries are getting higher and higher. [0003] During the normal production process of the pole piece coating machine, the NDC monitoring device is usually used to monitor the coat...

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Problems solved by technology

[0004] From the above situation, we can see that the accuracy of the NDC monitoring device determines the quality of the pole piece. Once the stability of the NDC monitoring device is not good, it will cause a large number of pole pieces to be scrapped due to unqualified coating, which will seriously affect the company. production cost

The factors affecting the accuracy of the NDC monitoring device are mainly due to the fluctuation of the surface density of the substrate itself, which eventually leads to inaccurate detection of the coating amount of the pole piece, and in severe cases, a large number of pole pieces will be scrapped

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