New Energy battery heat sink

The heat dissipation test was carried out with multiple sets of 4*5 18650 lithium battery packs.

The test conditions were charging current 1C, discharge current 3C, bottom plate temperature 18-19°C, initial temperature 32-33°C, heat dissipation composite thickness 0.7mm.

Test Results:

The final temperature of the battery pack was 42-44 ° C, the temperature rise was 11-12 ° C, and the temperature difference was 2.5-3 ° C.

Comparing 1mm aluminum sheet and potting thermal silica gel, the temperature difference was 6~7°C.

Conclusion:

This material improves the heat dissipation effect while reducing the weight and increasing the energy density.

This result is much lower than the domestic average, reducing the temperature difference within the battery pack, which can greatly improve the service life of the battery pack.

The developed tropical guide replaces the aluminum tube heat sink for electric vehicles.

Material	Advantages	Disadvantages
Artificial graphite	Thermal conductivity up to 1500W / (m · K)	High cost! Thin thickness, below 0.075mm
Artificial graphite	Thermal conductivity up to 400W/(m·K)	Difficult to process! High density! High cost!
Aluminum	Thermal conductivity of 227W / (m · K) low density, only 2.7g / cm3	Difficult to process! High cost! Large thermal resistance of the interface, poor heat dissipation!
Thermal Silica	Easy to process	a) Low thermal conductivity, only a few W / (m · K)
Thermal Silica	Easy to process	b) Large dosage, greatly increasing the weight, difficult to maintain
Graphite Composite Copper Mesh	Thermal conductivity up to 450W / (m · K)	Thermal conductivity can be further improved
	Low density, only about 2~2.5g/cm3
	Soft and bendable, easy to process
	The resistance is about 5 Ω/m, and it can be used as a heating tape at low temperatures.
	low cost