Which part of the 18650 lithium battery cap needs laser welding, and what is the structure like?
2018-08-08
The battery cap we refer to generally refers to the 18650 lithium battery cap. A small cap also requires laser welding processing. So which part needs to be welded, and what is its structure like? I believe many students who have little contact with such battery accessories may not understand these principles, and may not even know what a battery cap is. As a member of a Manufacturer in Shenzhen,SHINHOP battery cap laser welding equipmentI am not actually engaged in battery technology, but I still have a relatively good understanding of this area, and I might even understand it better than the technicians from 18650 lithium battery manufacturers (that's really too much).
There are actually many types of lithium battery caps, but the general structure and principle are the same. It serves many functions, including conducting electricity for the positive electrode of the lithium battery, acting as a safety valve, and also encapsulating the battery's structural functions. All of these functions are the responsibility of the battery cap, with the most important role being to prevent excessive battery pressure and to allow for timely venting. Therefore, the quality requirements for laser welding caps are quite strict, and there are already many professional laser welding machines on the market specifically for welding battery caps.
The structure of the battery cap is shown in the figure below (there may be differences among different manufacturers, but the principles are basically consistent).
The 18650 lithium battery cap includes 1. Steel cap; 2. Connecting piece; 3. Explosion-proof piece; 4. Aluminum ring; 5. Inner ring; 6. Rolled edge; 7. Insulation sealing ring; 8. Vent hole; 9. Breather hole; 10. Terminal; 11. Groove; 12. Buffer chamber.
Among them, the connection and explosion-proof pieces need to be welded with laser, which involves the number of welding points required by the user. Some manufacturers require four welding points, while others may require six or eight points. In fact, they are all laser pulse welding!
Battery manufacturers cannot produce all battery accessories. In fact, they are all specialized and cooperate with each other. Some battery manufacturers only produce battery caps, while others only produce battery cells or packaging. For example, power battery manufacturers purchase battery cells and package them themselves, resulting in control circuit boards to achieve the assembly or series connection of lithium batteries to meet the required rated power and ease of use. Power batteries are assembled from multiple battery modules, and battery modules are combined from multiple battery cells. This is for large power batteries, while small power batteries may sometimes just be the size of a single battery module.
SHINHOP entered the field of research and production of battery welding processing equipment relatively early, precisely because it aimed at the national new energy development trend. More than 10 years ago, it had been preparing for this. Through continuous exploration and progress, combined with the actual needs of new energy vehicle batteries, it has successively developed and produced battery caps, battery terminals, power battery PACK busbars, battery module laser welding equipment systems, etc. It has become a partner for battery welding solutions for 80% of domestic battery manufacturers, providing thousands of sets of automated welding processing solutions for lithium batteries and power batteries to domestic partners. It is a leading equipment manufacturer in the country and also an innovative technology enterprise in Shenzhen, one of the important enterprises prioritized for government support!
Due to technical confidentiality, for more battery accessory laser welding equipment, please visit our company. We welcome your visit!
【The above content is original. Please indicate the source when reprinting: Shenzhen SHINHOP Laser Equipment】
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Shenzhen SHINHOP Laser Equipment Co., Ltd. It is a scientific and technological enterprise specializing in the research and development, production and sales of industrial laser processing equipment. It has been deeply engaged in the new energy industry for 20 years, focusing on the non-standard customization of automatic lithium battery cell assembly line and module PACK production line. It has successively obtained the national high-tech and specialized new enterprise certification.
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