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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