Blade Battery Cells

Product Overview

Blade cells are long, thin, flat LFP cells built for direct integration into the pack without intermediate modules (CTP) and, in cell-to-body designs, into the vehicle structure itself (CTB). The format originated with BYD and is defined by structural participation: the cells act as load-bearing members, not just energy carriers. This is not a general-purpose cell that can be freely repackaged. The blade cell's value is inseparable from the CTP/CTB system it was designed into—buying the cell without the integration architecture discards most of its advantage.

Key Features

• Cell-to-pack ratio reaches 0.74–0.75. Blade-based packs achieve the highest cell-to-pack volume ratio among mainstream formats, compared with roughly 0.64 for conventional cell-module-pack designs. This is the primary source of its volumetric advantage, not cell-level energy density.
• Volumetric utilization exceeds 60% at pack level; CTB pushes system volume utilization to 66%. The long, thin geometry fills pack space that module casings and wiring would otherwise occupy. In CTB configuration, the pack becomes the vehicle floor structure, and body torsional stiffness roughly doubles.
• Manufacturing cost per kWh is lower than traditional prismatic LFP. The elongated, high-aspect-ratio prism with case “support areas” and side/end terminals simplifies pack rails and reduces non-active material. Blade-based packs are projected to remain the lowest-cost option through 2030.
• Low-temperature performance is a geometry-driven trade-off, not a chemistry limitation. Blade cells have a higher surface-to-volume ratio than thicker prismatic LFP cells. Experimental work shows that prismatic cells with greater thickness and lower S/V ratio retain superior discharge energy at low temperature because reduced convective loss and higher thermal inertia maintain core temperature. The blade format gains volumetric efficiency but does not match thick prismatic LFP in cold-soak energy retention at the cell level. BYD’s Gen 1 data lists −20°C discharge at 90% of room-temperature capacity; independent cell-level comparisons should be validated against the specific application’s cold-soak profile.
• Gen 2 raises cell energy density and fast-charge capability, but the format remains CTP/CTB-native. Second-generation blade cells reach 190–210 Wh/kg at cell level and support 10–70% charge in 5 minutes under BYD’s flash-charging system. These improvements do not change the procurement boundary: the cell is still specified as part of a pack architecture, not as a drop-in replacement for a prismatic cell in a conventional module.

Technical Specifications

Typical ranges for Gen 1 and Gen 2 blade cells. Exact values depend on supplier, generation, and pack integration; confirm against the specific cell drawing and system-level validation before design lock.

Procurement boundary: the values above describe blade cells as integrated into a BYD-defined pack architecture. Cell-level cycle-life and fast-charge figures are system-dependent and should not be compared directly against standalone prismatic cell datasheets without matching thermal management, compression, and BMS conditions.

Typical Applications

• Passenger EV & commercial vehicle platforms designed around CTP/CTB — the default use case; blade cells are specified as part of the pack structure, not as a commodity cell.
• Vehicle platforms prioritizing volumetric efficiency and cost over cold-climate performance — blade LFP delivers the highest cell-to-pack ratio and lowest pack cost among LFP formats, but cold-soak energy retention is inferior to thick prismatic LFP.
• Energy storage systems where BYD’s integrated pack architecture is adopted — blade cells have been applied in BYD’s energy storage products; standalone ESS procurement should not assume blade-cell compatibility without the matching pack design.
• Applications requiring structural participation from the battery — CTB configurations use the pack as a body stiffness member; this is a system-level design decision, not a cell-level feature.

Installation & Maintenance Notes

• Blade cells are not serviceable at cell level in typical CTP/CTB packs. The structural integration that delivers the volumetric advantage also makes individual cell replacement impractical without pack-level rework. Design for pack-level serviceability or replacement, not cell-level swap.
• Structural adhesive and compression are part of the cell specification. In CTB packs, cells are bonded and preloaded as structural members; the adhesive, fixture, and torque sequence are validated as a system. Substituting a “similar” blade cell without revalidating the structural bond invalidates the safety case.
• Thermal management is integrated at pack level. Blade packs use direct-cooling or liquid-cooling plates between cell groups; the cell itself does not carry a standalone thermal interface. Cold-plate design and coolant flow are system-level deliverables, not cell add-ons.
• Do not procure blade cells as standalone replacements for prismatic LFP. The terminal arrangement, aspect ratio, and structural role differ. A blade cell that physically fits a prismatic module cavity is not electrically or mechanically equivalent in a conventional pack.