A cylindrical lithium-ion power battery

Abstract

The invention discloses a cylindrical lithium ion power cell, which comprises a cylindrical housing, a positive electrode cover plate, a negative electrode cover plate, a positive electrode post, a negative electrode post, a center tube and an electrical core, and is characterized in that the positive electrode cover plate and the negative electrode cover plate are respectively fixed on two ends of the housing; the positive electrode post and the negative electrode post are respectively disposed on the positive electrode cover plate and the negative electrode cover plate; the center tube is positioned inside the housing; the two ends of the center tube are respectively connected with the positive electrode post and the negative electrode post; and the electrical core contains a negative electrode piece, an isolated film and a positive electrode piece, wherein the negative electrode piece, the isolated film and the positive electrode piece successively wind on the center tube; the negative electrode cover plate is equipped with a through hole; a negative electrode ceramic ring is seal welded inside the through hole; and the negative electrode post is disposed through the central hole of the negative electrode ceramic ring and seal welded with the negative electrode ceramic ring. According to the invention, the ceramic ring is used to separate the negative electrode cover plate from the negative electrode post, and vacuum sealing can be achieved after the ceramic ring is welded, thus greatly raising the reliability of the cell sealing and guaranteeing the security of the cell used for a long time; in addition, the cell provided by the invention has a long service life.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a cylindrical lithium ion power battery. Background technique [0002] Cylindrical lithium-ion power batteries are widely used in notebook batteries, power tools, electric bicycles and electric vehicles due to their high energy density, high specific power, good cycle performance, no memory effect, and no pollution. The existing cylindrical lithium-ion power battery is mainly composed of a cylindrical shell, a positive cover plate, a negative cover plate, a positive pole, a negative pole, a central tube, and a battery cell. At both ends, there are through holes on the positive cover plate and the negative cover plate, the positive pole and the negative pole are respectively penetrated in the through holes on the positive cover plate and the negative cover plate, and the central tube is located in the shell. Its two ends are respectively connected to the positive pole and the negative pol...

AI Technical Summary

Problems solved by technology

In order to separate the positive and negative poles and prevent short circuit, a seal made of plastic or other sealing materials is installed between the negative pole and the negative cover plate, which has the following defects: (1) The plastic seal is easy to cause hidden damage during assembly. Damaged, and prone to deformation and failure under long-term high-temperature conditions, resulting in battery leakage during long-term use; (2) Plastic seals are not resistant to high temperatures, easy to age, and use for a short time

Images