Negative plate, battery and preparation method

Abstract

The invention discloses a negative plate, a battery and a preparation method. The negative plate is provided with a first side surface and a second side surface which are opposite in a thickness direction, and a first end surface and a second end surface which are opposite in a first direction perpendicular to the thickness direction, and at least one of the first side surface and the second side surface is provided with a plurality of concave-convex parts. The concave-convex ports extend from the first end face to the second end face in a first direction, the first direction corresponds to a height direction of the battery, and the concave-convex ports are formed by rolling. According to the negative plate provided by the invention, a channel for electrolyte circulation can be formed between the negative plate and a diaphragm piece after the battery is assembled, so that a battery structure capable of efficiently discharging liquid is obtained, and the problems of difficulty in liquid injection and low efficiency are solved; and a channel between the negative plate and the diaphragm plate is beneficial to the rapid liquid discharging of the electrolyte in the liquid injection process; therefore, the production efficiency can be improved, full infiltration of the positive plate and the negative plate is ensured, and the performance exertion of the battery is facilitated.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a negative electrode sheet, a battery and a preparation method. Background technique [0002] Generally, the battery includes a positive electrode sheet, a negative electrode sheet, a separator sheet and a casing, and the positive electrode sheet, the negative electrode sheet and the separator sheet can be placed in the casing in a winding or lamination manner. And the electrolyte is required to fill the entire battery. Electrolyte is one of the four key materials of lithium batteries and is the "blood" of lithium batteries. At present, in the battery manufacturing process, the production efficiency of liquid injection has always been the bottleneck process, especially under the trend of high energy density, the pole piece is required to have a relatively high High compaction density, because the electrolyte is gradually absorbed only by the water absorption performance of the...

AI Technical Summary

Problems solved by technology

Electrolyte is one of the four key materials of lithium batteries and is the "blood" of lithium batteries. At present, in the battery manufacturing process, the production efficiency of liquid injection has always been the bottleneck process, especially under the trend of high energy density, the pole piece is required to have a relatively high High compaction density, because the electrolyte is gradually absorbed only by the water absorption performance of the internal material, it is difficult to inject the electrolyte, and the liquid injection speed will be further reduced, resulting in low efficiency, and the infiltration consistency of each area of ​​the pole piece poor

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