Connector temperature rise on the performance of charging lithium battery performance

Connector temperature rise on the performance of charging lithium battery performance

At the current storage area, the use and development of lithium-ion batteries is very rapid, and the lithium-ion battery storage can have the advantages of high energy density, long service life, green environmental protection, but there are some drawbacks, high production cost, poor safety performance, The danger of exploding, so the safety design of the thermal management system is critical to the application of lithium-ion batteries, and the connector is a string in parallel between the battery pack. Its temperature rise effects about the entire lithium ion battery The system has a great impact, so the low temperature rise is an inevitable trend for the development of the connector..

In a lithium-ion battery energy storage system, the sensitivity of the lithium ion battery on the temperature is important to temperature sensitivity of its material physical chemical properties.. The temperature directly affects the activity and conductivity of the electrode material, the insertion and deinterlasis of lithium ions on the electrode, and the lithium ion transients of the diaphragm, which in turn affect the electrochemical reaction inside the battery, and the outside is dynamic lithium battery.

Temperature sensitivity. Since the power lithium battery has a suitable operating temperature range, with the larger the activity of the internal active material in this range, the charge and discharge voltage and capacity of the battery will reduce the internal resistance of the battery accordingly, the power lithium The charge and discharge efficiency of the battery is also added. However, when the temperature exceeds a certain range, the temperature is too high, which speeds up the internal side reactance of the battery, which consumes lithium ions, solvents, and electrolyte, resulting in battery performance attenuation.

. Studies have shown that when the battery continues to work over 45 ¡ã C, its cycle life is significantly reduced, which is more obvious when charge and discharge at high magnification..

Therefore, if it works in a high temperature environment for a long time, the life of the power lithium battery will be significantly shortened, and its performance will also be greatly reduced, and even a safety accident.. Similarly, the temperature is too low, the activity of the internal active substance is significantly reduced, the internal group, the polarized voltage, the charge and discharge power and capacity will be significantly reduced, and even the battery capacity is irreversible, and the safety hazard is buried.

In particular, during charging, the lithium ion is detached from the positive electrode material to the electrode material and moves to the negative electrode material composed of graphite, and forms a Lic compound in a negative electrode material to the negative electrode material.. If the temperature is lowered, the charging speed is too fast, and the lithium ion is not as good as the negative electrode to form a LiC compound, and the lithium ion near the negative electrode will capture electrons and become a metal lithium, and to form a lithium graphic crystal.

Broken membrane forming short circuit. In addition, the uneven distribution of the internal temperature velocity of the battery case can also result in the unevenness of each battery module, monomer performance, in particular, the aging rate of the battery distributed in the high temperature region will be significantly faster than the low temperature portion, with time accumulation The physical properties between different batteries will be more obvious, so that the consistency between the batteries is varied, even in advance, shortened the life of the entire power lithium battery system..

As a parallel necessary element in the battery pack, the connector is a heat effect of the large current to make the connector in the battery pack, when the connector temperature rises, the temperature of the battery pack is transmitted. Inside the battery, thereby influence the stability of the battery, so that the connector reaches the low temperature rise characteristics becomes a necessary condition, and the communication energy-independent connector uses the terminal technology of the company’s independent intellectual property rights, and contacts the terminal inside and inserted. The surface is kept in the optimal area, effectively reducing the contact resistance, reducing overcurrent density, reducing current temperature rise; and this, new design, designing multiple surfaces into corrugated seafses, increased heat dissipation function; In addition, metal materials use imported high purity copper, high conductivity, overcurrent temperature rise, plastic materials use unique alloy materials, collect a variety of plastic characteristics, combined with high strength and high toughness, meet fire prevention requirements, high The thermal conductivity, accelerates heat dissipation; in terms of internal terminal and line nose connection technology, FIRST patented technology is used to ensure the reliability of both, increase the contact area, so that the temperature rise of the overcurrent reaches effective reduction, while stably and firm Multi-point crimping process is effective in reducing the temperature rise between net nose and wire, and ensures the consistency of temperature rise.

The company’s current temperature rise test results of different current level connectors can be controlled below 35 degrees Celsius (20 degrees Celsius Ambient Temperature). Lithium-ion battery storage is an inevitable trend in the development of the times, ensuring that the safe and reliable operation of lithium-ion batteries is the primary condition for the operation of the energy storage system, and the large current connector is an indispensable part of the lithium-ion battery, and Jiangsu linkage power Co., Ltd.

always adheres to safety, reliable, environmentally friendly product design concept, and supplies special electrical connector products for energy storage lithium-ion batteries.

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