Negative plate binder distribution detection method and dyeing device

Abstract

The invention discloses a negative plate binder distribution detection method and a dyeing device. The negative plate binder distribution detection method comprises the following steps: acquiring a to-be-detected negative plate sample, and dyeing the negative plate sample; in the dyeing process of the sample, placing the negative plate sample in a closed container, and injecting bromine steam intothe closed container containing the negative plate sample; storing the negative plate sample in a closed container filled with the bromine steam for a preset time; and taking out the negative plate sample from the closed container and obtaining the distribution condition of a binder in the negative plate sample. The dyeing treatment is carried out on a negative plate by utilizing the bromine steam, CuBr2 formed by the direct side reaction of bromine steam and a current collector on a section of an electrode coating can be effectively reduced; the interference of the diffusion of the side reaction product CuBr2 in the negative plate active coating on detection of the negative plate cross section binder is avoided, the influence of the side reaction on the structural stability of the plateis avoided, and the accuracy of distribution detection of the negative plate binder is guaranteed.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for detecting the distribution of a negative electrode binder and a dyeing device. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that primarily relies on the movement of lithium ions between positive and negative electrodes to function. When the negative electrode is coated, the binder (SBR) has the risk of floating with the evaporation of water during the drying process, resulting in a decrease in the adhesion of the negative electrode material, which is prone to occur during the subsequent manufacturing process and the cycle of the finished battery The case of stripping. Therefore, in the battery manufacturing process, it is necessary to effectively detect the distribution of the binder (SBR) in the negative electrode material. [0003] Since SBR is the same as other negative electrode materials, its main elements...

AI Technical Summary

Problems solved by technology

[0004]The common dyeing method of negative electrode sheet binder has the following problems: 1) The electrode sheet needs to be immersed in liquid bromine, which will easily cause the liquid bromine to react with the copper current collector Form CuBr2, diffuse to the electrode interface and interfere with the distribution detection of the binder (SBR); 3) Graphite is prone to chemical reactions in high-concentration liquid bromine, which may interfere with the detection of binder (SBR) distribution

Images