What is the effect of connector temperature rise on the energy storage performance of lithium batteries?
In the lithium-ion battery energy storage system, the temperature sensitivity of the lithium-ion battery mainly stems from the temperature sensitivity of its material physicochemical properties. The temperature will directly affect the activity and conductivity of the electrode material, the intercalation and deintercalation of lithium ions on the electrode, the permeability of lithium ions of the separator, etc., and then affect the electrochemical reaction inside the battery, and its external performance is the power lithium battery. temperature sensitivity.
When the lithium-ion battery continues to work above 45 °C, its cycle life is significantly reduced, which is more obvious during high-rate charge and discharge. Therefore, if you work in a high temperature environment for a long time, the life of the power lithium battery will be significantly shortened, and its performance will be greatly reduced, and even lead to safety accidents. Similarly, if the temperature is too low, the activity of the active material inside the battery will be significantly reduced, its internal resistance and polarization voltage will increase, and the charge and discharge power and capacity will be significantly reduced, even causing irreversible capacity degradation of lithium-ion batteries, and burying potential safety hazards.
In addition, the uneven distribution of the internal temperature of the lithium-ion battery box for a long time will also cause the unbalanced 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 that of the low temperature part. The difference in physical properties between different batteries will become more and more obvious, so that the consistency between lithium-ion batteries will become worse, and even premature failure will occur, which shortens the life of the entire power lithium battery system.
The connector is a necessary component for series and parallel connection between lithium-ion battery packs. When the battery pack is charged and discharged, the passage of a large current will cause a thermal effect to the connector. When the temperature of the connector rises and exceeds the temperature of the lithium-ion battery pack, The temperature will be transferred to the inside of the battery, which will affect the stability of the battery, so it is a necessary condition to make the connector reach the characteristic of low temperature rise. The contact resistance is reduced, the overcurrent density is reduced, and the current temperature rise is reduced; at the same time, multiple surfaces are designed into a corrugated fan shape, which improves the heat dissipation function.
In addition, the metal material adopts imported high-purity red copper, which has high electrical conductivity and stable overcurrent temperature rise. The plastic material uses a unique alloy material, which integrates various plastic properties, and has both high strength and high toughness. It has a high thermal conductivity and accelerates heat dissipation; in terms of the connection technology between the internal terminal and the wire nose, the FIRST patented technology is used to ensure the reliability of the connection between the two, increase the contact area, and effectively reduce the overcurrent temperature rise. 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 of the lithium battery.
Low temperature rise design is an inevitable trend of connector development:
At present, in the field of energy storage, the application and development of lithium-ion batteries are very rapid. Lithium-ion battery energy storage has the advantages of high energy density, long service life, green environmental protection, etc., but there are also some disadvantages, such as high production cost and poor safety performance. There is a danger of explosion, so the safety design of the thermal management system is very important for the application of lithium-ion batteries. The connector is an indispensable component in series and parallel between battery packs. The energy system has a great influence, so the design of low temperature rise has become an inevitable trend in the development of connectors.
How to improve the heat dissipation of lithium-ion batteries?
1. Install a cooling fan at one end of the lithium-ion battery module, and leave a ventilation hole at the other end to accelerate the flow of air between the gaps of the cells and take away the high heat that occurs when the cells are working;
2. Add TC100X series thermal conductive silicone gaskets to the top and bottom of the electrode end, so that the heat that is not easily dissipated at the top and bottom is conducted to the shell through the thermal conductive silicone sheet for heat dissipation. At the same time, the TC100X series thermal conductive silicone gasket has high electrical insulation and anti-stab The wearability is very good for the protection of lithium-ion battery packs.
