What are the effects of connector temperature rise on the performance of lithium batteries

In the lithium battery energy storage system, the temperature sensitivity of lithium batteries is mainly due to the temperature sensitivity of the material's physical and chemical properties. Temperature will directly affect the activity and conductivity of the electrode material, the insertion and deintercalation of lithium ions on the electrode, the lithium ion permeability of the separator, etc., and then affect the electrochemical reaction inside the battery, and its external performance is a power lithium ion battery Temperature sensitivity. Because the power lithium-ion battery has a suitable working temperature range, as the temperature increases in this range, the greater the activity of the internal active material, the higher the charge and discharge voltage and the capacity of the battery, the lower the internal resistance of the battery, and the power The charging and discharging efficiency of lithium-ion batteries has also been increased accordingly. However, when the temperature exceeds a certain range, if the temperature is too high, the internal side reactions of the battery will be accelerated. These side reactions consume lithium ions, solvents and electrolytes, etc., resulting in degradation of battery performance. The research statement on the impact of the temperature rise of the connector on the performance of the lithium battery is that when the battery continues to work above 45 ℃, its cycle life is clearly reduced. This situation is even more obvious during high-rate charging and discharging. Therefore, if working in a high temperature environment for a long time, the life of the power lithium-ion battery will be clearly shortened, and its performance will be greatly reduced, and even cause safety accidents. Similarly, if the temperature is too low, the activity of the active materials inside the battery will be significantly reduced, and the internal group and polarization voltage will increase, and the charge and discharge power and capacity will be significantly reduced, and even cause irreversible degradation of the battery capacity, and buried safety hazards. Especially during the charging process, under the application of an electric field applied to the charging device, lithium ions are extracted from the positive electrode material into the electrolyte and move to the negative electrode, sequentially enter the negative electrode material made of graphite, and form LiC compounds. In addition, the long-term uneven distribution of the temperature field inside the battery box will also cause the imbalance of the performance of each battery module and cell, especially the aging rate of the battery distributed in the high temperature area will be significantly faster than the low temperature part, and it will accumulate over time. The difference in physical properties between different batteries will become more distinct, which will make the consistency between the batteries worse, and even premature failure occurs, shortening the life of the entire power lithium-ion battery system. The connector is a necessary component for series and parallel connection between battery packs. When the battery pack is charged and discharged, the passing of a large current will cause the connector to have a thermal effect. When the temperature of the connector rises and exceeds the temperature of the battery pack, the temperature will be transmitted. To the inside of the battery, which further affects the stability of the battery, it is a necessary condition for the connector to achieve the characteristics of low temperature rise. The dedicated connector for interlocking energy storage adopts the terminal technology of the company’s independent intellectual property rights, and contacts the inside of the terminal with the pin Keep the surface in the best area, effectively reduce the contact resistance, reduce the over-current density, and reduce the current temperature rise; at the same time, the new appearance design, the multiple surfaces are designed into a corrugated fan shape, which improves the heat dissipation function. What is the impact of the temperature rise of the connector on the performance of the lithium battery? In addition, the metal material uses imported high-purity copper, which has high conductivity and stable overcurrent temperature rise. The plastic material uses a unique alloy material, which combines a variety of plastic characteristics. The characteristics of high strength and high toughness meet the fire protection requirements, while having a high thermal conductivity, speeding up heat dissipation; in the connection technology of internal terminals and wire lugs, FIRST patented technology is adopted to ensure the reliability of the connection between the two and increase the contact area , The over-current temperature rise can be effectively reduced. At the same time, the stable and firm multi-point crimping process effectively reduces the temperature rise of the connection between the wire nose and the wire, and ensures the consistency of the temperature rise. The company's current temperature rise detection results of different current grade connectors can be controlled below 35 degrees Celsius (ambient temperature 20 degrees Celsius). Lithium battery energy storage is an inevitable trend of the development of the times. To ensure the safe and reliable operation of lithium batteries is the primary condition for the operation of energy storage systems. High-current connectors are an indispensable part of lithium battery energy storage. Jiangsu Liandong Power Co., Ltd. has always Adhere to the product design concept of safety, reliability and environmental protection, and supply special electrical connector products for energy storage lithium batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages of graphene batteries?