How to ensure the safety of polymer lithium battery cells?
Publish Time: 2025-04-09
Ensuring the safety of polymer lithium battery cells is a complex and meticulous process, which involves material selection, structural design, manufacturing process, and use management. With the continuous advancement of science and technology, polymer lithium batteries have been widely used in portable electronic devices such as smartphones and tablets due to their high energy density, light and portable, and good safety performance. Taking the Xiaomi mobile phone battery BM54/BM42 built-in battery soft pack polymer lithium battery cell as an example, let's explore its safety assurance measures.First of all, from the perspective of material selection, polymer lithium battery cells use high molecular polymers as electrolytes, which have higher chemical stability and thermal stability than traditional liquid electrolytes. The high molecular polymer electrolyte forms a stable colloidal structure inside the battery, effectively preventing the leakage of the electrolyte, thereby reducing the risk of safety accidents such as short circuits and fires caused by electrolyte leakage.In terms of structural design, the polymer lithium battery cell adopts soft packaging technology, and the outer shell is composed of multiple layers of composite materials, which not only ensures the flexibility of the battery, but also improves its impact resistance. This soft packaging structure can effectively buffer the internal pressure and reduce the possibility of explosion when the battery is abnormal. At the same time, multiple layers of safety isolation measures are designed inside the battery cell, such as the separator between the positive and negative electrodes, and the protective layer outside the battery cell, etc. These structures together constitute the safety barrier of the battery.In terms of manufacturing process, the production process of polymer lithium battery cells strictly controls the quality of each link. From the procurement of raw materials to the assembly and packaging of battery cells, each step has undergone strict testing and screening. In particular, in the packaging process of the battery cell, advanced sealing technology is used to ensure the sealing inside the battery cell and prevent the intrusion of external moisture and oxygen, thereby extending the service life of the battery and improving its safety.In addition, in order to further improve the safety of polymer lithium battery cells, manufacturers have also taken a variety of intelligent protection measures. For example, overcharge protection, over-discharge protection, short circuit protection and temperature protection are integrated into the battery management system. When the battery is overcharged, over-discharged, short-circuited or over-temperature occurs, the battery management system can quickly cut off the circuit to prevent further damage to the battery or cause safety accidents.For consumers, the correct use and management of polymer lithium battery cells is also an important part of ensuring their safety. Consumers should avoid placing batteries in high temperature, humid or flammable environments, avoid using non-original chargers for charging, and avoid overcharging and discharging batteries. At the same time, it is also essential to regularly check the health of the battery and promptly identify and deal with potential safety hazards.
