How to control temperature rise and prevent thermal runaway risk in low-speed power lithium batteries under high-rate discharge requirements?
Publish Time: 2026-04-27
In low-speed electric vehicles, electric forklifts, and some energy storage applications, low-speed power lithium batteries often face high-rate discharge requirements. At this time, the internal current of the battery increases significantly, and the superposition of ohmic resistance heating and polarization heat can easily lead to excessively rapid temperature rise. If the heat cannot be dissipated in time, it will not only accelerate material aging but may also induce thermal runaway, posing serious safety hazards.1. Optimize cell design to reduce heat sourcesControlling temperature rise at its source is key to reducing internal battery heating. By selecting low-resistance material systems, optimizing electrode formulations, and improving the uniformity of the conductive network, ohmic losses during high-rate discharge can be reduced. Simultaneously, rationally designing electrode thickness and compaction density makes the ion transport path smoother, reducing polarization heat generation, thereby maintaining a lower heating level under high loads.2. Improve thermal management system efficiencyAn efficient thermal management system is a key means of controlling temperature rise. For low-speed power lithium batteries, natural air cooling, forced air cooling, or liquid cooling solutions can be selected depending on the application scenario. Optimizing the heat dissipation channel layout, increasing thermally conductive materials, and improving heat exchange efficiency enable rapid heat dissipation. Furthermore, ensuring uniform temperature distribution among the cells helps avoid localized overheating.3. Introducing Temperature Monitoring and Intelligent ControlIntegrating multiple temperature sensors into the battery system and combining them with a Battery Management System (BMS) for real-time monitoring allows for timely detection of temperature rise trends. When the temperature approaches a safe threshold, the system can automatically limit the discharge current or adjust the operating mode to prevent further temperature increases. This dynamic adjustment mechanism improves safety while maintaining performance.4. Optimizing Structure and Heat Conduction PathsThe structural design of the battery module has a significant impact on heat dissipation. By rationally arranging the cells, shortening the heat conduction path, and using high thermal conductivity interface materials, overall heat dissipation capacity can be improved. Simultaneously, avoiding areas of heat accumulation in the structural design allows for uniform heat dissipation, reducing the risk of localized hotspots.5. Enhanced Safety Protection and Thermal Runaway SuppressionBesides controlling temperature rise, the ability to suppress thermal runaway under extreme conditions is also crucial. For example, using high-temperature resistant insulation materials, fire-resistant isolation structures, and pressure relief designs can prevent heat from spreading to the surrounding environment when a single cell malfunctions. Furthermore, selecting electrolytes and cathode materials with higher thermal stability also helps improve the overall safety margin of the system.6. Rational Use and Maintenance StrategiesIn practical applications, avoiding prolonged ultra-high rate discharge and operation in high-temperature environments are important measures to reduce risk. At the same time, regularly checking the battery system's heat dissipation components and connection status to ensure they are in good working order can also effectively prevent abnormal temperature rise.In summary, temperature rise control of low-speed power lithium batteries under high-rate discharge conditions requires comprehensive optimization from multiple levels, including cell design, thermal management, intelligent monitoring, and safety protection. Through systematic design and refined management, the safety and reliability of battery operation can be ensured while meeting high-power output requirements.
