Lithium ion battery end cover, lithium ion battery and production method of lithium ion battery

Abstract

The invention discloses a lithium ion battery end cover capable of preventing the leakage of an electrolyte solution and the heating during large-current discharging, a lithium ion battery and a production method of the lithium ion battery. The lithium ion battery end cover is characterized by comprising a cover body, a positive guide pin and a negative guide pin, wherein the tail parts of the positive guide pin and the negative guide pin are arranged in the cover body and are respectively provided with a guide pin holder for preventing the guide pin from being separated from the cover body, each guide pin holder is a conductor, and the bottom of each guide pin holder is level to the bottom of the cover body. The lithium ion battery comprises an aluminum shell and a roll core provided with a positive pole piece and a negative pole piece in a rolling manner, wherein the end cover with the positive guide pin and the negative guide pin is arranged in an opening of the aluminum shell, and the end cover is connected with the positive pole piece and the negative pole piece through tabs. The production method comprises the steps of producing the end cover, producing the roll core, welding, loading the end cover into the shell, rolling, and secondarily welding. The guide pins are integrally injected into the cover body and are generally seamless; the guide pins are prevented from being withdrawn through the guide pin holders, and the bottom area of the guide pin holders is large, so that the welding area of the tabs and the pole pieces can be increased, and the tabs and the pole pieces are firm and are unlikely to drop; the contact area is also increased, the impedance is reduced, and the heating during large-current discharging is avoided.

Description

technical field [0001] The invention relates to a battery, in particular to a rechargeable battery, in particular to a lithium-ion battery end cover, a lithium-ion battery and a production method thereof. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Lithium-ion battery refers to the general term for batteries with lithium-ion intercalation compounds as positive electrode materials. A battery that generally uses a material containing lithium as an electrode is a representative of a modern high-performance battery. Lithium-ion batteries use carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. There is no metallic lithium, only lithium ions. This is the lithium-ion battery. [0003] Lithium-ion batteries are composed of three parts: positive electrode, negative electrode and electroly...

AI Technical Summary

Problems solved by technology

Although it is very convenient to connect in series and parallel during use, the contact surface between the rubber plug and the guide pin (the aluminum stem of the guide pin) is prone to battery leakage due to poor sealing

However, because the connecting part of the guide pin (the pin tail of the guide pin is flattened) is relatively narrow, it can only be connected to the battery core by riveting. 90°C, it will also cause the rubber plug to deform and cause cracks to cause fatal defects such as battery leakage.

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