Square battery cell

Abstract

The invention provides a square battery cell. The square battery cell comprises multiple unit positive plates, multiple unit negative plates and a diaphragm, wherein the diaphragm comprises a reservezone and a winding zone, and the winding zone is used for arranging the unit positive plates and the unit negative plates; the quantity of the unit negative plates is one more than the quantity of theunit positive plates; the unit positive plates and the unit negative plates are cyclically arranged in the winding zone in a sequence of the unit negative plate, the unit positive plate, the unit positive plate and the unit negative plate, the reserve zone covers a first unit negative plate in the winding zone, and the first unit negative plate is sequentially and cyclically wound with the adjacent unit positive plate, unit positive plate and unit negative plate; or the unit positive plates and the unit negative plates are cyclically arranged in the winding zone in a sequence of the unit positive plate, the unit negative plate, the unit negative plate and the unit positive plate, the reserve zone covers the first unit positive plate in the winding zone, and the first unit positive plate is sequentially cyclically wound with the adjacent unit negative plate, unit negative plate and unit positive plate.

Description

【Technical Field】 [0001] The invention relates to the technical field of batteries, in particular to a square battery core. 【Background technique】 [0002] Compared with the winding process of cylindrical cells, the lamination process of square cells has a larger pole piece contact area and less polarization, which is beneficial to the improvement of the energy density and magnification of the cell. [0003] The existing square cell stacking process is to form a basic unit cell with a unit positive sheet, a unit negative sheet and a unit diaphragm, and a square cell is made by stacking a plurality of basic unit cells; or a unit positive sheet and a unit negative electrode. After the sheets are adhered to the cell diaphragms, they are then wound by a continuous diaphragm to form a square cell. Both processes need to cut a continuous diaphragm unit, because the thickness of the diaphragm is thin and flexible, the diaphragm is punched, and the unit positive sheet or the unit negative...

AI Technical Summary

Problems solved by technology

Both processes need to cut a continuous separator into a diaphragm unit. Because the thickness of the diaphragm is thin and soft, the die-cutting of the diaphragm, the winding with the unit positive electrode sheet or the unit negative electrode sheet, and the unit diaphragm and the unit positive electrode sheet or The process of hot pressing the unit negative plate to make the unit diaphragm and the pole piece adhere, the operation complexity is high, the pass rate of the process is low, the requirements for equipment automation are high, and the applicability is not strong

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