The Impact of Battery Connectors Temperature Rise on the Performance of Energy Storage Systems

In the energy storage field, 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.. However, there are also some disadvantages, such as high production costs, poor safety performance, and the risk of explosion. Therefore, the safety design of the thermal management system is crucial for the application of lithium batteries. As an indispensable component for series and parallel connections between battery packs, its 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 battery storage 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 sensitivity of the power battery. 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 battery's charge and discharge voltage and capacity increase, the internal resistance decreases accordingly, and the charging and discharging 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 the battery continues to operate above 45?, 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. They sequentially enter the negative electrode material composed of graphite and form LiC compounds. If the temperature is lowered and the charging speed is too fast, the lithium ions will not have time to enter the negative electrode to form LiC compounds. The lithium ions close to the negative electrode will capture electrons and become metallic lithium, and aggregate to form lithium dendrites. When the lithium dendrites grow, they may cause irritation. Broken diaphragm creates a short circ ...

News Release: The Impact of Battery Connectors Temperature Rise on the Performance of Energy Storage Systems
Submitted on: November 29, 2023 07:19:33 AM
Submitted by: Dan Thompson
On behalf of: https://www.guchen-connector.com/