Traction Battery System
AssemblyRoof and rear mounted lithium battery packs storing 350–550 kWh at 600–750 V DC, with thermal management and a battery management system. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Traction Battery System parts and their functions
6 top-level parts · 3,673 parts in total · full bill of materials below
| # | Part | Qty | What it does |
|---|---|---|---|
| 1 | Battery Pack 9 parts | 6× | Roof-mounted battery pack enclosures wired in series-parallel |
| 2 | Master BMS Controller 5 parts | 1× | Master battery management controller |
| 3 | Battery Cold Plate | 6× | Liquid cold plate bonded to each pack base |
| 4 | Coolant Pump 4 parts | 2× | Electric coolant circulation pumps |
| 5 | HV Junction Box 5 parts | 1× | High-voltage distribution and protection box |
| 6 | HV Cable Set | 1× | Orange shielded high-voltage cabling between packs and inverter |
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Bill of materials for Traction Battery System
6 top-level lines · 45 rows shown · 3,673 parts total · indented to 3 levels| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Battery Pack 9 parts | electric-bus-battery-pack | 6× | 6 | 600 | assembly |
| 1.1 | Cell Module 5 parts | electric-bus-battery-module | 8× | 48 | 73 | assembly |
| 1.1.1 | Prismatic Lithium Cell | electric-bus-prismatic-cell | 24× | 1,152 | · | part |
| 1.1.2 | Cell Interconnect Busbar | electric-bus-cell-busbar | 23× | 1,104 | · | part |
| 1.1.3 | Module End Plate | electric-bus-module-endplate | 2× | 96 | · | part |
| 1.1.4 | Cell Balance Harness | electric-bus-balance-harness | 1× | 48 | · | part |
| 1.1.5 | Cell Spacer Pad | electric-bus-cell-spacer | 23× | 1,104 | · | part |
| 1.2 | Slave BMS Board 4 parts | electric-bus-bms-slave | 1× | 6 | 5 | assembly |
| 1.2.1 | Bare PCB | pcb-bare | 1× | 6 | · | part |
| 1.2.2 | Microcontroller | mcu | 1× | 6 | · | part |
| 1.2.3 | SMD Passive (R/C/L) | smd-passives | 1× | 6 | · | part |
| 1.2.4 | Connector | connector | 2× | 12 | · | part |
| 1.3 | HV Contactor | electric-bus-pack-contactor | 2× | 12 | · | part |
| 1.4 | HV Pack Fuse | electric-bus-pack-fuse | 1× | 6 | · | part |
| 1.5 | Pack Enclosure | electric-bus-pack-enclosure | 1× | 6 | · | part |
| 1.6 | Pack Busbar | electric-bus-pack-busbar | 4× | 24 | · | part |
| 1.7 | Pack Current Sensor | electric-bus-current-shunt | 1× | 6 | · | part |
| 1.8 | Fastener Set | fastener-set | 1× | 6 | · | part |
| 1.9 | O-Ring Set | oring-set | 1× | 6 | · | part |
| 2 | Master BMS Controller 5 parts | electric-bus-bms-master | 1× | 1 | 9 | assembly |
| 2.1 | Bare PCB | pcb-bare | 1× | 1 | · | part |
| 2.2 | Microcontroller | mcu | 2× | 2 | · | part |
| 2.3 | SMD Passive (R/C/L) | smd-passives | 1× | 1 | · | part |
| 2.4 | Relay | relay | 2× | 2 | · | part |
| 2.5 | Connector | connector | 3× | 3 | · | part |
| 3 | Battery Cold Plate | electric-bus-battery-cooling-plate | 6× | 6 | · | part |
| 4 | Coolant Pump 4 parts | electric-bus-battery-coolant-pump | 2× | 2 | 24 | assembly |
| 4.1 | Stator Assembly 3 parts | stator-assembly | 1× | 2 | 3 | assembly |
| 4.1.1 | Stator Core (laminations) | stator-core | 1× | 2 | · | part |
| 4.1.2 | Copper Winding | copper-winding | 1× | 2 | · | part |
| 4.1.3 | Slot Insulation | stator-insulation | 1× | 2 | · | part |
| 4.2 | Rotor Assembly 4 parts | rotor-assembly | 1× | 2 | 19 | assembly |
| 4.2.1 | Rotor Shaft | rotor-shaft | 1× | 2 | · | part |
| 4.2.2 | Rotor Core | rotor-core | 1× | 2 | · | part |
| 4.2.3 | Neodymium Magnet | neodymium-magnet | 16× | 32 | · | part |
| 4.2.4 | Ball Bearing | ball-bearing | 1× | 2 | · | part |
| 4.3 | Ball Bearing | ball-bearing | 1× | 2 | · | part |
| 4.4 | O-Ring Set | oring-set | 1× | 2 | · | part |
| 5 | HV Junction Box 5 parts | electric-bus-hv-junction-box | 1× | 1 | 9 | assembly |
| 5.1 | Main HV Fuse | electric-bus-main-fuse | 1× | 1 | · | part |
| 5.2 | Manual Service Disconnect | electric-bus-service-disconnect | 1× | 1 | · | part |
| 5.3 | HV Contactor | electric-bus-pack-contactor | 2× | 2 | · | part |
| 5.4 | Pack Current Sensor | electric-bus-current-shunt | 1× | 1 | · | part |
| 5.5 | HV Distribution Busbar | electric-bus-hv-busbar | 4× | 4 | · | part |
| 6 | HV Cable Set | electric-bus-hv-cable-set | 1× | 1 | · | part |
Where the traction battery system is used
1 product across 1 domain contain it, directly or inside a sub-assemblyUsed in 1 assembly
Sourcing: possible vendors
Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $1–$500. How estimates work| Vendor | HQ | Specialty | MOQ | Lead time |
|---|---|---|---|---|
|
🇨🇳CATL
catl.com ↗
|
Ningde, CN | Li-ion cell & pack maker | 5,000 cells | 8–12 wks |
| evebattery.com ↗ | Huizhou, CN | Li-ion cell maker | 5,000 cells | 8–12 wks |
| amararaja.com ↗ | Tirupati, IN | Batteries & energy | 5,000 cells | 8–12 wks |
| durapowergroup.com ↗ | Singapore | Li-ion battery systems | 5,000 cells | 8–12 wks |
|
🇨🇳BYD
byd.com ↗
|
Shenzhen, CN | EV & battery manufacturer | 5,000 cells | 8–12 wks |