Characteristics of the cables connecting the battery pack system to the vehicle

China [CN]

With the rapid development of manufacturing industry, China's automobile industry is facing the challenges of industrial transformation, emission reduction, energy crisis and low-carbon development. The development of new energy vehicles has become the only way to reduce the automobile industry's dependence on oil and exhaust pollution.

Battery pack is the main energy storage component of electric vehicles, which is composed of lithium batteries, and directly affects the performance of electric vehicles. Due to the limited space for loading batteries on the vehicle, the number of batteries required for normal operation is also large. The batteries will discharge at different rates and generate a large amount of heat at different heat generation rates. In addition, time accumulation and space impact will gather a large amount of heat, resulting in complex and variable ambient temperature conditions for battery pack operation. The temperature rise in the battery pack seriously affects the operation, cycle life, charging acceptability, battery pack power and energy, safety and reliability of the electrochemical system of the battery pack. If the battery pack of the electric vehicle cannot dissipate heat in time, the temperature of the battery pack system will be too high or distributed unevenly, which will reduce the cycle efficiency of battery charging and discharging, affect the power and energy of the battery, and in serious cases, lead to thermal runaway, affecting the safety and reliability of the system; In addition, due to the dense placement of heating battery bodies, there must be more heat gathering in the middle area, and less edge areas increase the temperature imbalance between the cells in the battery pack, which will cause the imbalance of the performance of each battery module and cell, ultimately affecting the consistency of battery performance and the accuracy of battery state of charge (SOC) estimation, and affecting the system control of electric vehicles.

Therefore, in order to improve the vehicle performance and maximize the performance and life of the battery pack, it is necessary to optimize the structure of the battery pack and design battery optimization for electric vehicles that can adapt to high and low temperatures.

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