Do you know what to pay attention to when designing lithium-ion battery casings?

Lithium-ion battery shell is a kind of protective shell that protects the cells and internal circuits. The length of the lithium-ion battery shell is very important for the battery. In order to make the battery meet the extraordinary requirements such as waterproof and shockproof, the design of the lithium-ion battery case is also extremely important for the battery. We must grasp the essentials when designing. Let's talk about the classification of lithium-ion battery casings and the precautions for casing design. Lithium-ion battery case classification 1. Steel-case lithium-ion batteries Early angular lithium-ion batteries were mostly steel cases, which were mostly used for mobile phone batteries. Later, due to the low weight ratio of steel cases and poor safety, they were gradually used by aluminum cases and soft-packaged lithium-ion batteries. Replaced. At present, there are still some small factories recycling steel shells to build B-product mobile phone batteries and some low value-added MP3 and MP4 batteries. But in the case of cylindrical lithium-ion batteries, there is another situation. Most manufacturers use steel as the battery shell material. Because of the physical invariance of steel materials, the pressure resistance is much higher than that of aluminum shell materials. After optimizing the design and layout, the security device has been arranged inside the battery core, and the security of the steel shell cylindrical battery has reached a new level. Don’t you see that most of the current strip-type computer batteries are made of steel shells. As a carrier. 2. Aluminum-case lithium-ion battery Because of its lighter weight and slightly better safety than steel-case lithium-ion batteries, aluminum-case lithium-ion batteries have become the main force of mobile phone batteries. Due to the relatively high cost of mold-opening aluminum shells, the models are relatively small, and the minimum order quantity requirements are high. Important models will be combined with some common mobile phone battery models. 3. Soft-packaged lithium-ion batteries Because of their light weight, low mold-opening cost, and high-end security, soft-packaged lithium-ion batteries are slowly expanding their market share. It is mainly used in digital products, and now it is gradually growing into markets such as mobile phones, notebook computers, and electric objects. It is foreseeable that in the next few years, the market share of flexible packaging lithium-ion batteries will continue to expand steadily, and the application scope will become more and more widespread. Because the outsourcing is aluminum-plastic film, the resistance to pressure is very weak, limited to the current domestic packaging factories' skills and conditions, which will cause bulging. The ratio is still relatively high. Production design examples of lithium-ion battery shells. The design of lithium-ion battery shells can be divided into: PVC heat sealing, plastic, and metal. PVC heat-sealing: What kind of shell encapsulation type is recycled outside of the lithium-ion battery pack depends on the detailed requirements of the customer. Regarding the packaging type of the recycled PVC heat-sealing, it is generally used for the number of battery cells in series and the overall weight is small. It can be recycled in a lighter environment (≤2kg). However, for battery packs with an overall weight of ≥1kg, a firm support should be added between the cells, and a glass fiber board should be added to the periphery, and then the PVC should be recovered and heat sealed. Plastic: Recycle the plastic shell. The important thing is that the different lithium-ion battery packs are finalized. The shell involved will probably be molded. The cost of the mold is not a small expense. For example, in the early stage of development, the product has not been finalized, and the prototype shell can be recycled. Proofing, the difference in the material and process requirements of the shell will also affect the cost. Metal: The metal shell is also communicated with the plastic shell. Before the product is finalized or the quantity demand is small, the recycling of sheet metal samples is initiated. This is important because the sample preparation has a short delivery time, such as large batches, and mold opening is also initiated. Regarding the waterproof grade requirements of the metal casing, it will also greatly affect the cost, and there is still a requirement for the metal casing of extraordinary materials, and the cost will be higher. What should be paid attention to when designing lithium-ion battery casing? 1. Pole piece connection: Initiate the use of ultrasonic or spot welding welding methods, and the design of the lithium-ion battery casing should make the pole piece free from external force. 2. The soldering time cannot be longer than 3 seconds, and the number of times cannot be higher than 5 times. The next soldering can be performed only after the pole pieces are cooled. 3. It is strictly forbidden to directly heat the battery cell, which will be damaged if the temperature is higher than 100℃. 4. Reliability of Li-ion battery: The side with the largest area of u200bu200bthe battery should be firmly on the shell, and the battery should not be loose after installation. 5. Shell solidity: The lithium-ion battery shell should have enough machine strength to protect the battery from machine impact. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. 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