1800mah 18650 battery.Soft-packed lithium iron phosphate battery assembly process and method

　　Soft-packed lithium iron phosphate battery assembly process and method. Whether in the digital or power application markets, soft-packed lithium iron phosphate battery packs are becoming a very important technical route. Soft-packed batteries are actually batteries that use aluminum-plastic packaging film as packaging material. The reason why soft-packed batteries can be thermally sealed is that they use aluminum-plastic packaging film.

　　Soft-packed lithium iron phosphate batteries are batteries in which a liquid lithium-ion battery is covered with a polymer shell. The structure is packaged with aluminum-plastic film. In the event of a safety hazard, the soft-packed battery will only bulge and crack at most, so The overall safety performance is high, but with the continuous development of the economy, people have also put forward higher requirements for soft-pack lithium battery packs. The existing lithium battery packs are complex to install and the process is cumbersome, and improvements need to be made.

　　Soft-packed lithium iron phosphate battery assembly process and method

　　Aluminum plastic film forming process

　　Soft-packed lithium iron phosphate batteries can be designed into different sizes according to customer needs. After the outer dimensions are designed, corresponding molds need to be opened to form the aluminum plastic film. Generally, single pit punching is chosen when the battery core is thin, and double pit punching is chosen when the battery core is thick, because too much deformation on one side will break through the deformation limit of the aluminum-plastic film and cause rupture.

　　Top and side sealing process

　　The top and side sealing process is the first packaging process of soft-packed lithium iron phosphate batteries. Top and side sealing actually includes two processes, top sealing and side sealing. First, place the wound core into the punched pit, and then fold the packaging film in half along the dotted line. The top seal is to seal the tabs, which are metal. After formation, some cells, especially thick cells, may undergo certain deformation due to large internal stress. Therefore, some factories will set up a fixture shaping process after formation, also called fixture baking.

　　After cutting the second seal of the air bag, you need to trim and fold the edges. This means cutting the first and second seal edges to the appropriate width, and then folding them to ensure that the width of the battery core does not exceed the standard. After folding, the battery cells can be put into the capacity classification cabinet for capacity classification. In fact, it is a capacity test to see if the capacity of the battery core has reached the specified minimum value. In principle, all batteries need to be tested for capacity before leaving the factory to ensure that batteries with unqualified capacity will not be sent to customers. However, when the battery cell production volume is large, some companies will perform partial capacity classification and use statistical probability to determine the qualification rate of the batch of battery cells.

　　In the process of resting, forming, and clamp shaping, after the liquid injection and sealing are completed, the battery core needs to be rested first. Depending on the process, it can be divided into high-temperature resting and room-temperature resting. The purpose of resting is to let the injected The electrolyte fully wets the pole piece. Then the battery core can be used to make chemical products.

　　After the capacity is divided, the cells with qualified capacity will enter the post-processing process, including appearance inspection, yellow glue application, edge voltage detection, tab transfer welding, etc. Several processes can be added or deleted according to customer needs. The last step is OQC inspection, and then packaging and shipping.

　　Note that this is still just the battery cell. The batteries will be sent to the Pack factory for further processing, including soldering circuit boards, packaging, etc. Downstream of the Pack factory are various user manufacturers, such as Apple, Lenovo, and Huawei. They will take the battery Pack and install it into the terminal, and then it will be in the hands of our consumers.

　　Soft package lithium iron phosphate battery process flow

　　Since the casing is made of aluminum-plastic film, its production process is different from the other two types of commercial batteries in some aspects. For example, the packaging process of aluminum plastic film, such as the shaping process during the formation process, etc.

　　For soft-packed lithium iron phosphate batteries, the aluminum-plastic film has a large deformation space, and unlike steel-cased aluminum-cased batteries, which will explode when thermal runaway occurs; the shell is a layer of aluminum-plastic film, which is light in weight and has a small proportion of inactive parts. , Soft-pack batteries are 40% lighter than steel-cased lithium batteries of the same capacity, and 20% lighter than aluminum-cased batteries.

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