CTC

CTC (Cell to Chassis, battery-chassis integration / direct cell-to-chassis integration technology) is an electric vehicle (EV) manufacturing technology that directly integrates traction battery cells or modules into the vehicle's chassis or body structure. By eliminating conventional battery modules and standalone casing structures, this technology deeply integrates the battery system with the chassis frame, thereby maximising space utilisation, lowering the vehicle's centre of gravity, and streamlining the manufacturing process.

Core Technical Architecture and Operating Principle

The architecture of CTC technology mainly comprises module-less high-density cell arrangements, an integrated chassis tray design, as well as high-strength structural bonding and potting processes.

Module-Less Direct Cell Integration: 

In conventional battery manufacturing, cells are first assembled into modules before multiple modules are housed inside a battery pack. CTC technology bypasses this intermediate tier by directly securing and integrating cells into the chassis structure in a specific matrix layout. This eliminates the physical space occupied by module side plates, end plates, and redundant fasteners, significantly boosting the battery pack's volumetric efficiency and energy density.

Chassis Load Fusion and Lightweight Design: 

Rather than functioning as a standalone unit mounted beneath the chassis, the battery system is structurally merged with chassis members to jointly bear torsional stress and bending loads during driving. Through the use of high-strength aluminium alloy trays, multi-chamber side sill structures, and lightweight composites, CTC effectively enhances overall chassis rigidity while freeing up more generous vertical and longitudinal space inside the cabin.

Safety Specifications and Physical Constraints 

Strictly Prohibit Continued Driving After Severe Undercarriage Scraping, Crushing, or Deformation (Prohibiting Continued Driving After Severe Undercarriage Bottom Impact or Deformation): 

Because CTC technology embeds battery cells directly into the chassis structure, any severe undercarriage impact or bottoming out poses an extremely high risk of direct mechanical damage to the cells. Drivers must never take chances and continue driving after visible underbody damage occurs or if a battery system fault warning appears on the instrument cluster; a professional high-voltage isolation inspection and safety assessment must be carried out immediately.

Strictly Prohibit Unauthorised Cutting and Welding Repairs on CTC Chassis Structures or Battery Integration Zones (Prohibiting Unauthorized Cutting and Welding Repairs on CTC Chassis Structures or Battery Integration Zones): 

The CTC chassis integration area features intricate cell layouts and critical load-transfer paths. Following an accident, repairs must strictly never be outsourced to unauthorised workshops that lack the certifications for high-voltage and integrated body repairs. Non-compliant cutting, welding, or structural realignment will compromise the battery's thermal management and mechanical defences, drastically escalating the risks of thermal runaway and structural failure.