Polymer lithium-ion battery packaging technology and its impact on battery performance?
Publish Time: 2025-01-29
As the main energy supplier for modern electronic devices, the packaging technology of polymer lithium-ion battery is not only related to the safety and stability of the battery, but also directly affects the overall performance and service life of the battery. The quality of packaging technology has become one of the important indicators to measure the quality of polymer lithium-ion battery.The packaging of polymer lithium-ion battery mainly adopts aluminum-plastic film thermal packaging technology. The aluminum-plastic film consists of three layers: the inner layer is the bonding layer, which is mostly made of polyethylene or polypropylene materials for sealing and bonding; the middle layer is aluminum foil, which can prevent the penetration of water vapor outside the battery and the leakage of internal electrolyte; the outer layer is the protective layer, which is mostly made of high-melting-point polyester or nylon materials, with strong mechanical properties, which can prevent external forces from damaging the battery.During the packaging process, the wound battery cell is first placed in the stamped aluminum-plastic film pit, and then the top and side seals are performed. The top seal is mainly the packaging of aluminum-plastic film, ear glue and copper-nickel ear. This process has a greater possibility of damage, so special attention should be paid to the quality and sealing of the packaging. Side sealing is the packaging between the aluminum-plastic film CPP layers, which is mainly to prevent the appearance of wrinkles and bubbles. After the packaging is completed, the battery forms a completely sealed structure, which effectively isolates the influence of the external environment on the internal battery.The impact of packaging technology on the performance of polymer lithium-ion battery is mainly reflected in the following aspects. First, good packaging technology can ensure the sealing of the battery, prevent the infiltration of water vapor and air, and thus extend the service life of the battery. Secondly, the packaging pressure and temperature need to be controlled during the packaging process to ensure the fusion degree and packaging strength of the aluminum-plastic film. Too high or too low packaging pressure, too high or too low temperature, may affect the packaging quality and performance of the battery. Finally, the optimization of the packaging process can also improve the safety and stability of the battery and reduce battery failures and safety accidents caused by poor packaging.In addition, the packaging technology of polymer lithium-ion battery is still innovating and developing. With the continuous advancement of battery design and manufacturing technology, packaging technology is also developing towards a more efficient, more environmentally friendly and more intelligent direction. For example, some new packaging technologies are exploring the use of lighter, thinner, and more flexible materials, as well as more advanced packaging processes and equipment to further improve the energy density, cycle life, and safety performance of batteries.In summary, the packaging technology of polymer lithium-ion batteries has an important impact on their performance. Only by continuously optimizing packaging processes and technologies can the quality and performance of batteries be improved to meet the high requirements of modern electronic devices for batteries.
