Solid-State Battery Bus Pilot Line Launches: Thermal Management Challenges Across Seasons

Solid-state battery bus demonstration lines launched simultaneously in two locations today, marking solid-state battery technology's first commercial deployment in public transportation.

Line Parameters

Parameter	Value
Route length	31 km
Battery pack capacity	350 kWh
Solid-state battery type	Sulfide all-solid-state
Fast charge peak	1.2C (420kW)
Range	~280 km

Operational Challenges

Northern Route: Winter Cold

Operational data disclosed for Route A (Harbin):

Winter preheating energy consumption issue:

• Night garage temperature drops to -20°C
• Battery pack needs heating to above 0°C for safe fast charging
• Preheating consumes approximately 8% of daily electricity
• Equivalent to approximately 30kWh additional daily consumption for battery heating

Solutions being explored:

• Integrated heating modules in station charging posts
• Upgraded battery pack insulation layer
• Smart scheduling to reduce outdoor overnight exposure

Southern Route: Summer Heat

Route B (Shenzhen) focuses on fast-charging heat management:

Summer fast-charging challenge:

• Afternoon ambient temperature reaches 35°C+
• Battery pack temperature easily rises to 45°C+
• Heat accumulation during fast charging triggers thermal runaway warnings
• Need to lower SOC to 70% window before fast charging

Technical Significance

Solid-state battery advantages vs liquid lithium batteries:

Characteristic	Solid-State	Liquid Lithium
Energy density	400-500 Wh/kg	200-300 Wh/kg
Safety	No electrolyte leakage	Thermal runaway risk
Temperature range	-30°C ~ 60°C	0°C ~ 45°C
Cycle life	Expected 5000+	2000-3000

Operation data from these demonstration lines will provide key references for subsequent large-scale deployment.

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