How does the temperature rise of the connector affect the performance of the lithium battery?
At present, in the field of energy storage, the use and development of lithium batteries is very fast. Lithium battery energy storage has the advantages of high energy density, long service life, and environmental protection, but there are also some disadvantages, high production costs, poor safety performance, and explosions. The safety design of the thermal management system is critical for the application of lithium batteries.
The connector is an indispensable element in series and parallel between the battery packs. Its temperature rise effect has a very important effect on the entire lithium battery energy storage system. Large impact, so low temperature rise design has become an inevitable trend of connector development.
In lithium battery energy storage systems, the sensitivity of lithium batteries to temperature is mainly due to the temperature sensitivity of their physical and chemical properties.
Temperature directly affects the activity and conductivity of the electrode material, the intercalation and deintercalation of lithium ions on the electrode, and the lithium ion permeability of the separator, etc., and then affects the electrochemical reaction inside the battery. Its external appearance is the temperature of the power battery Sensitivity.
Because the power battery has a suitable operating temperature range, the higher the temperature within this range, the greater the activity of the internal active material, the battery's charge and discharge voltage and capacity will increase accordingly, and the internal resistance of the battery will decrease accordingly. Discharge efficiency also increases accordingly. However, when the temperature exceeds a certain range, an excessively high temperature will accelerate the side reactions inside the battery. These side reactions consume lithium ions, solvents, and electrolytes, resulting in battery performance degradation.
Studies have shown that when the battery continues to work above 45 ° C, its cycle life is significantly reduced, and this situation is even more pronounced at high rate charge and discharge. Therefore, if you work in a high-temperature environment for a long time, the life of the power battery will be significantly shortened, its performance will be greatly reduced, and even a safety accident will be caused.
Similarly, if the temperature is too low, the activity of the active material inside the battery will be significantly reduced, its internal group and polarization voltage will increase, the charge and discharge power and capacity will be significantly reduced, and even the battery capacity will be irreversibly decayed, and hidden safety risks will be buried. Especially during the charging process, under the action of an external electric field from the charging device, lithium ions are released from the positive electrode material into the electrolyte and moved toward the negative electrode, and sequentially enter the negative electrode material composed of graphite, and form a LiC compound.
The uneven distribution of the temperature field inside the battery box for a long time will also cause the uneven performance of the battery modules and individual cells, especially the battery aging rate distributed in the high temperature area will be significantly faster than the low temperature part. Different batteries accumulate with time. The difference in physical properties between the batteries will become more obvious, which will cause the consistency between the batteries to deteriorate, and even cause early failure, shortening the life of the entire power battery system.
The metal material is imported high-purity copper with high electrical conductivity and stable over-temperature temperature rise. The plastic material uses a unique alloy material. It integrates a variety of plastic characteristics, has both high strength and high toughness characteristics, meets fire protection requirements, and has high thermal conductivity.
Coefficient to accelerate heat dissipation; In terms of the internal terminal and wire nose connection technology, the FIRST patented technology is used to ensure the connection reliability of the two, increase the contact area, and effectively reduce the overcurrent temperature rise. At the same time, it is stable and stable at multiple points. The 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.
Connectors are necessary components in series and parallel between battery packs. When the battery packs are charged and discharged, the passage of a large current will cause a thermal effect on the connector. When the temperature of the connector rises above the temperature of the battery pack, the temperature will pass. To the inside of the battery, which further affects the stability of the battery, it is necessary to make the connector achieve low temperature rise characteristics. Keep the contact surface of the terminal and the pin at the optimal area to effectively reduce the contact resistance and reduce the overcurrent density. , Reducing the temperature rise of the current; at the same time, the new appearance design, multiple surfaces are designed into a corrugated fan shape, which improves the heat dissipation function.
Lithium battery energy storage is an inevitable trend in the development of the times. Ensuring the safe and reliable operation of lithium batteries is the primary condition for the operation of energy storage systems. High-current connectors are an integral part of lithium battery energy storage.
If you want to know more, our website has product specifications for the battery, you can go to ALLICDATA ELECTRONICS LIMITED to get more information