Lithium battery hard pack PACK application: square battery solder joint protection and aluminum shell blue film back adhesive solution

Against the backdrop of global energy transition and rapid development of new energy vehicles, the application of lithium batteries as core energy storage technology is becoming increasingly widespread. Especially in hard pack (or soft pack) PACK systems, square batteries have become one of the mainstream. Their high energy density, long cycle life, and high safety have made them widely used in fields such as electric vehicles (EVs), energy storage, and consumer electronics. However, with the increasing demand for applications, lithium batteries also face many technical challenges in production, use, and maintenance, especially in terms of solder joint protection and shell sealing. Classification and challenges of lithium batteriesLithium batteries can be mainly divided into the following types:Cylindrical batteries: commonly found in consumer electronics and some small and medium-sized power tools. Its structure is simple, the production process is mature, and it can provide good stability.Square battery: commonly used in electric vehicles (EVs) and energy storage devices. The advantages of square batteries are high energy density, customizable volume, and compact structure, making them suitable for large-scale battery pack applications.Soft pack battery: It has a wide range of applications in the field of electric vehicles, especially in some high-end models. It adopts flexible packaging, which can improve the design flexibility of battery packs to a certain extent, reduce volume and weight.Although square batteries perform well in many applications, they also face some technical challenges in practical use, mainly reflected in solder joint protection, aluminum shell packaging, and issues such as high temperature and vibration that the battery may encounter during use. If these challenges are not properly addressed, they may affect the safety, reliability, and lifespan of batteries.Challenge: Protection of solder joints in square batteries In the PACK design of square batteries, solder joints are important parts for connecting the various units inside…