Lithium ion battery and notch type core rod and support pillars of lithium ion battery

Abstract

The invention relates to the field of lithium battery production, in particular to a lithium ion battery and a notch type core rod and support pillars of the lithium ion battery. The lithium ion battery comprises the notch type core rod and the two support pillars, and the two support pillars are symmetrically mounted at the two ends of the notch type core rod. The notch type core rod is cylindrical, an inner hole is formed in the notch type core rod, and four first grooves are formed in the wall of the inner hole. Each support pillar comprises a support pillar body, a welding platform is arranged at the upper end of each support pillar body, and four second grooves are formed in the welding platforms. Four third grooves are further formed in the support pillar bodies, and the third grooves are communicated with the second grooves. According to the lithium ion battery, the notch type core rod and the support pillars, the support pillars are additionally arranged at the two ends of the core rod, the effect for completely fixing the core rod is achieved, the risk that the core rod slides inside a battery cell is avoided, and the safety performance and electrochemical capacity of the battery are improved substantially; due to the notch type core rod, liquid injection time is shortened, and liquid injection efficiency is improved.

Description

technical field [0001] The invention relates to the field of lithium battery production, in particular to a lithium ion battery and its notched mandrel and top post. Background technique [0002] At present, lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries are a kind of secondary batteries, which mainly rely on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use lithium-containing materials as electrodes, which are representatives of modern high-performance batteries and play a very important role in ...

AI Technical Summary

Problems solved by technology

[0004] (1) The mandrel is mainly made of stainless steel, and the adding methods include automatic addition during the winding process of the battery or manual addition after the winding is completed. The battery cell is easy to slide during the core drop process, and the mandrel is difficult to fix after the latter is added. The diameter of the mandrel is generally smaller than the diameter of the winding hole, and it is easy to slide, thereby increasing problems such as battery short circuit and rapid capacity decay;

[0005] (2) Adding a mandrel inside the cell occupies part of the electrolyte space, prolonging the battery injection time, thereby reducing the injection efficiency

However, none of the prior art involves improving the performance of lithium-ion batteries by improving the mandrel.

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