Cylindrical lithium ion power cell

Abstract

Disclosed is a cylindrical lithium ion power battery, comprising a cylindrical casing, an anode cover plate, a cathode cover plate, a positive pole, a negative pole, a central tube, and an electric core. The anode cover plate and the cathode cover plate are fixedly mounted at two ends of the casing respectively. The positive pole and the negative pole are disposed on the anode cover plate and the cathode cover plate respectively. The central tube is located in the casing, and has two ends connected to the positive pole and the negative pole respectively. The electric core comprises a negative piece, an isolation membrane, and a positive piece. The negative piece, the isolation membrane, and the positive piece are rolled around the central tube in sequence. The cathode cover plate is provided with a through hole. A cathode ceramic ring is soldered in the through hole in a sealed manner. The negative pole runs through a central hole of the cathode ceramic ring, and is soldered to the cathode ceramic ring in a sealed manner. In the present invention, the ceramic ring isolates the cathode cover plate from the negative pole, and vacuum sealing may be achieved after the ceramic ring is soldered, thereby greatly improving the reliability of the sealing of the battery, ensuring the safety during the long term use of the battery, and extending the service life of the battery.

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