With the wide application of electric forklifts in modern industrial logistics scenarios, the lithium-ion power unit has become the core component that determines the continuous operation performance of equipment, and the matching thermal management system is one of the key supporting modules to ensure the stable performance of the power unit.

1. Core Significance of Thermal Management

The optimal operating temperature range for common lithium-ion power units of forklifts is between 20℃ and 40℃. When the operating temperature exceeds 50℃ for a long time, the aging rate of the internal electrolyte and pole pieces will be significantly accelerated, which will indirectly shorten the overall service life of the power unit. When the ambient temperature is lower than 0℃, the discharge activity of the internal active material will decrease, the instantaneous output power will be limited, and the energy utilization efficiency will drop obviously. The basic function of the thermal management system is to keep the power unit running within the reasonable temperature range, and control the temperature difference between different areas of the power unit within the normal index, so as to avoid local overheating or uneven performance attenuation.

2. Common Thermal Management System Categories

At present, the mainstream thermal management schemes for forklift lithium-ion power units are divided into passive heat dissipation and active temperature regulation. The passive heat dissipation scheme usually adopts high thermal conductivity silica gel pad combined with metal heat dissipation shell, which transfers the heat generated by the power unit to the external environment through natural convection. This scheme has simple structure, low failure rate and no extra energy consumption, which is suitable for light load and intermittent operation scenarios. The active temperature regulation scheme includes air cooling and liquid cooling modes. The air cooling mode realizes rapid heat exchange by guiding the air flow through the built-in fan and heat dissipation fins, which is easy for daily maintenance and suitable for medium load operation scenarios. The liquid cooling mode relies on the circulating flow of heat exchange medium to take away the internal heat, which has higher heat exchange efficiency and more uniform temperature control effect, and is more suitable for heavy load and continuous high intensity operation scenarios.

3. Daily Operation and Maintenance Guidelines

In the daily use of electric forklifts, operators can carry out basic inspection and maintenance of the thermal management system according to the operation manual. First, regularly clean the dust, debris and packaging fibers accumulated at the air inlet and outlet of the heat dissipation channel, to avoid blockage of the air duct that reduces the heat dissipation efficiency. Second, regularly check the working state of the temperature sensing module, to ensure that the collected temperature data can accurately reflect the real state of the power unit, and avoid misoperation caused by data deviation. Third, in the low temperature environment in winter, do not run the equipment at full load immediately after starting, reserve 3 to 5 minutes of low-speed operation time to let the power unit rise to the appropriate working temperature. Fourth, in the high temperature season in summer, avoid the lithium-ion power unit being exposed to direct sunlight for a long time during outdoor operation, to prevent the ambient temperature from being too high and increase the load of the thermal management system.

4. Common Misconceptions to Avoid

Many new operators tend to ignore the daily inspection of the thermal management system, thinking that no system alarm means the thermal management is in good condition. In fact, long-term operation of the power unit beyond the optimal temperature range will not cause sudden failure, but will gradually accelerate the attenuation of the battery cycle life, which will increase the later use cost invisibly. In addition, it is not allowed to disassemble or modify the structure of the thermal management system without professional guidance, which may damage the original heat dissipation layout, lead to the risk of local heat accumulation, and affect the normal and safe operation of the whole equipment.