Lithium battery cover cap

Abstract

The invention discloses a lithium battery cover cap which is provided with an ultrasonic electrode lug and is high in sealing property, and belongs to the technical field of battery accessories. The lithium battery cover cap comprises a top cover, a bottom cover and a safety valve, and is characterized in that the bottom cover is improved in such a manner that for a battery with a non-flat top cover, an aluminum sheet in the bottom cover is welded with the electrode lug which is positioned in a region where arcs corresponding to two circular gas release hole end points of the aluminum sheet; for a battery with a flat top cover, the electrode lug is welded on a flat-plate anti-explosion sheet in the bottom cover and is positioned at the center position corresponding to an arc of the flat-plate anti-explosion sheet; furthermore, a sealing ring is improved, and the structure of the bottom of the lithium battery cover cap is changed. According to the improved battery cover cap, in a battery manufacturing technology, a positive electrode lug of the battery and the electrode lug of the cover cap only need to be butted and welded with an ultrasonic welding machine, so that the total manufacturing cost of a battery factory is greatly lowered; furthermore, the assembling efficiency is improved; the sealing effect is enhanced; liquid leakage and small aluminum sheet falling are reduced, and positive and negative electrode short circuit of the battery can be well prevented.

Description

technical field [0001] The invention relates to a battery safety combination cap, in particular to a lithium battery cap with ultrasonic welding tabs and good airtightness, belonging to the technical field of battery accessories. Background technique [0002] The emergence of batteries provides an important power supply guarantee for our human life, entertainment and work. With the development of society and the progress of human civilization, primary batteries will gradually be eliminated due to their environmental pollution, low capacity, and short service life, and replaced by secondary batteries with advantages such as no pollution, large capacity, and long service life. Among them, the unique structure and performance of cylindrical lithium batteries are widely used in various fields, such as notebook computers, mobile power supplies, power tools, etc. are the representatives. [0003] The safety combination cap is the most important safety guarantee component of the l...

AI Technical Summary

Problems solved by technology

[0004] 1. During the battery manufacturing process, the laser machine welding of the positive electrode tab of the cap is limited by the welding area of ​​the small aluminum sheet of the safety combined cap and the direction of the tab. The operation is inconvenient, the efficiency is reduced, and the manufacturing cost of the battery is virtually increased.

[0005] 2. Most of the welding of the positive electrode ear of the cap is welded by a laser machine. The cost of this equipment is too high, and the welding surface of the point is small

[0006] 3. The electric tool itself needs a battery that can provide instantaneous high-current discharge, and the traditional production process cannot provide a battery safety combination cap capable of instantaneous high-current discharge.

[0007] 4. The sealing ring is an important part of the cap. Poor quality will affect the sealing effect of the battery, easily cause liquid leakage, and even cause immeasurable losses such as explosion and fire.

The pressure exerted by the traditional sealing ring when the battery is sealed is squeezed by the R angle of the rolling groove, and is directly transmitted to the small aluminum sheet welded by the laser, causing the small aluminum sheet to deform or fall off directly, which is likely to cause a positive and negative short circuit

[0008] 5. When combining materials with safety combination caps, overfilling or underfilling will directly affect the performance of the battery, and it will be scrapped, which is difficult to quantify

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