NiMH No. 7 battery

Introduction to heat pipe technology for thermal management of NiMH No. 7 battery

With the continuous improvement of power battery energy density, the increase in fast charging requirements and the increase in life requirements, it is urgent to develop new thermal management technologies to solve the current technical bottlenecks. Heat pipes, such efficient heat-conducting components, are the best choice for future high-performance power battery thermal management systems. Advantages of using heat pipes for battery thermal management High heat dissipation efficiency Heat pipes have extremely low thermal resistance (~0.1K·W-1) and extremely high thermal conductivity (>1000W·m-1K-1). Their heat flux density can reach more than 50W·cm-2, and their heat transfer capacity is much higher than that of forced air cooling or single-phase fluid convection heat transfer methods. Fast heating rate Public research data shows that the heating rate of batteries heated by heat pipe conduction is 1.5 times that of traditional PTC heating. At 30W heating power, the temperature can rise by 20℃ in 3 minutes. If the power is 70W, the temperature can rise by 40℃ in 2 minutes, so it can greatly shorten the start-up time of electric vehicles in cold environments. Good temperature uniformity performance Studies have shown that a microchannel heat pipe with a length of 1m is heated at one end, and the temperature difference along the length is less than 2°C; a heat source with an area of 1cm2 and a heat output of 20W is applied to the center of a 380cm2 flat heat pipe, and the temperature difference of the entire surface is also within 2°C, which reflects the excellent temperature uniformity of the heat pipe. Good safety and high reliability Battery packs using heat pipes do not need to be circulated through water circuits to achieve water and electricity separation, which has higher safety. In addition, the overall structure of the system is simple and easy to maintain, so the system reliability is higher. At present, many scholars and engineers in the thermal management industry have focused their attention on heat pipe technology and have carried out a series of theoretical and experimental studies. Existing research packages mainly involve: analysis of the influence of heat generation characteristics of NiMH No. 7 battery on heat transfer of heat pipes, research on heat pipe design methods for NiMH No. 7 battery, research on heat management system heat dissipation structure design methods, and research on low-temperature heating of batteries using heat pipes. Existing research has verified the reliability and application value of heat pipes. However, as electric vehicles have higher requirements for thermal management systems, research on heat pipes still needs to be further deepened: further combined with actual vehicle operating conditions, an effective real-time control strategy for heat pipe heat dissipation should be formulated to achieve efficient and low-energy battery thermal management. Fully consider the heat pipe structure design and its layout, optimize the heat transfer performance, especially the performance analysis and structural design optimization of flat-plate heat pipes. Comprehensively consider the system's thermal and electrical characteristics as well as system energy consumption and lightweight indicators, and propose a multi-objective optimization scheme for the thermal management system. The research on heating strategies in low-temperature environments needs to be further deepened.

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