At present, in the field of energy storage, the application and development of lithium batteries are very rapid. Lithium battery energy storage has the advantages of high energy density, long service life, green and environmental protection, etc., but there are also some disadvantages, such as high production cost, poor safety performance, and the possibility of explosion. dangerous, so the safety design of the thermal management system is crucial for the application of lithium batteries. As an indispensable component for series and parallel connection between battery packs, the connector’s temperature rise effect has a great impact on the entire lithium battery energy storage system. Large impact, so low temperature rise design has become an inevitable trend in the development of connectors.
In lithium battery energy storage systems, the sensitivity of lithium batteries to temperature is mainly due to the temperature sensitivity of the physical and chemical properties of their materials. 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. Its external manifestation is the temperature of the power battery. sensitivity. Since the power battery has a suitable operating temperature range, within this range, as the temperature increases, the activity of its internal active materials becomes greater, the charge and discharge voltage and capacity of the battery increase, the internal resistance of the battery decreases accordingly, and the charge and discharge capacity of the power battery decreases accordingly. Discharge efficiency also increases accordingly. However, when the temperature exceeds a certain range, excessive temperature will accelerate the internal side reactions of the battery. These side reactions consume lithium ions, solvents, electrolytes, etc., resulting in battery performance degradation.
Research shows that when a battery continues to operate above 45°C, its cycle life is significantly reduced, which is more obvious when charging and discharging at high rates. Therefore, if it works in a high temperature environment for a long time, the life of the power battery will be significantly shortened, its performance will also be greatly reduced, and it may even cause safety accidents. Similarly, if the temperature is too low, the activity of the active materials inside the battery will be significantly reduced, the internal group and polarization voltage will increase, and the charge and discharge power and capacity will be significantly reduced, even causing irreversible attenuation of battery capacity and posing safety risks. Especially during the charging process, under the action of the external electric field of the charging equipment, lithium ions are extracted from the positive electrode material, enter the electrolyte, and move to the negative electrode, and in turn enter the negative electrode material composed of graphite, and form LiC compounds.
In addition, the long-term uneven distribution of the temperature field inside the battery box will also cause uneven performance of each battery module and cell. In particular, the aging rate of batteries distributed in high-temperature areas will be significantly faster than that in low-temperature areas. Over time, the The physical property differences between different batteries will become more and more obvious, resulting in poor consistency between batteries and even premature failure, shortening the life of the entire power battery system.
Connectors are necessary components for series and parallel connection between battery packs. When the battery pack is charged and discharged, the passage of large current will cause a thermal effect in the connector. When the temperature of the connector rises and exceeds the temperature of the battery pack, the temperature will spread. to the inside of the battery, thereby affecting the stability of the battery, so it is a necessary condition for the connector to achieve low-temperature rise characteristics. The dedicated connector for linked energy storage uses the company’s proprietary intellectual property terminal technology to contact the inside of the terminal with the pin. The surface is kept in the optimal area, which effectively reduces the contact resistance, reduces the over-current density, and reduces the current temperature rise; at the same time, the new appearance design designs multiple surfaces into corrugated sectors to improve the heat dissipation function.
In addition, the metal material uses imported high-purity red copper, which has high conductivity and stable overcurrent temperature rise. The plastic material uses a unique alloy material, which combines a variety of plastic properties and has both high strength and high toughness to meet fire protection requirements. It has a high thermal conductivity to speed up heat dissipation; in terms of internal terminal and line connection technology, FIRST patented technology is used to ensure the reliability of the connection between the two, increase the contact area, effectively reduce the temperature rise of over-current, and at the same time, stabilize The strong 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 test results for connectors of different current levels can be controlled below 35 degrees Celsius (ambient temperature 20 degrees Celsius).
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 indispensable part of lithium battery energy storage. Dongguan Konnra Electronics Co., Ltd. We always adhere to the product design concepts of safety, reliability and environmental protection, and provide dedicated electrical connector products for energy storage lithium batteries.
