Cell-to-pack (CTP) and cell-to-body (CTB) architectures now define the volume-EV pack layout, with the global cell-to-body market reaching $15.33B in 2025 and an IDTechEx material-demand CAGR of 11.8% running through 2036 [S6][S2].
CMP (cell-module-pack) dominated 2010s automotive programs because it gave engineers modular scaling, easy service, and a clean thermal-management boundary, but the module shell and internal busbars became the single largest source of non-active mass once cell energy density climbed past 250 Wh/kg [S4].
CTP vs CTB vs CMP: what changes structurally
CTP integrates cells directly into the pack, dropping the module housing and its wiring, which raises the cell-to-pack volume ratio and typically yields a 10-15% pack-level energy density gain over a comparable CMP build [S4]. CTB goes further: the pack itself becomes a load-bearing floor member of the body-in-white, which adds structural reinforcement (adhesive, top-hat sections, bottom shields) that lowers pack-level density slightly, yet still raises vehicle-level density because the body itself can be lightened [S4].
The trade-off is real and engineer-visible. BYD's CTB design on the DENZA Z9GT uses Blade Gen 2 cells and is rated at 1036 km of CLTC range, but only because the structural pack is paired with a large-format prismatic cell around 100-150 Ah per cell; replicating that with a 2170 cylindrical layout would force a step-change in laser-welded busbar and cooling-plate design [S4][S7].
Cell-format prerequisite: large prismatic and 46x cylindrical
CTP and CTB are only practical with large-format cells; small 18650/21700 layouts cannot be packed tightly enough once the module is removed [S4]. The deployment curve matches this: BYD Blade Gen 1 (large prismatic) shipped in volume from 2020 onward, while Tesla's 4680 cells entered Model Y packs in 2023-2024 and remain the dominant large-format cylindrical option in North American CTB programs [S4][S1].
Chemistry compounds the constraint. IDTechEx expects LFP to keep gaining share against NMC through 2036 on a $/kWh basis, with NMC reserved for high-power and luxury segments where higher nickel content (NMC811 and beyond) and silicon-blend anodes (20-40%wt mid-term, 80-90% high-silicon toward 2034-2036) are commercialized [S2]. For a CTP or CTB program, the cell choice is the architecture choice; specifying a 21700 NMC pack and then asking for a CTB layout is a contradiction that procurement will surface in the first RFQ.
Selection criteria by use case
For volume passenger EVs in China, LFP large prismatic + CTP is the cost default: parts count drops, welding shifts to laser tab-to-busbar, and the cooling plate is integrated into the pack base, which is why BYD, CATL Qilin, and SVOLT short-blade packs all converge on this stack [S4][S1]. For luxury or high-performance programs that need higher energy density, NMC811 or NCA in either large prismatic (CATL Qilin) or 4680 cylindrical (Tesla) is the realistic CTB pathway, accepting the nickel and silicon-anode cost premium [S2][S4].
Commercial and off-road vehicles follow a different rule. Pack repair economics matter more than a 5% density win when a single module swap can return a truck to service in hours, so CMP and its modular serviceability still win in mining, construction, and heavy industrial fleets [S1]. Engineers specifying construction machinery and equipment duty cycles should default to modular packs unless the OEM can demonstrate a field-repair strategy for the structural CTB variant.
OEM field in 2026: who has shipped what
CATL, BYD, LG Energy Solution, Tesla, Volkswagen, Stellantis, and SVOLT are the publicly identified developers of CTP or CTB packs as of 2026; BYD and Tesla are the earliest CTB deployers, with CATL's CTP (cell-to-pack, not body-integrated) covering the widest external customer base through licensed supply [S4][S7]. CleanTechnica's February 2026 reporting framed BYD's blade-cell CTB as a structural battery floor in the seal, contrasting it with Tesla's 4680 structural pack approach and flagging slower movers as exposed on cost-per-kWh [S7].
Material supply follows the cell-format shift. EV cell and pack material demand is set to reach 22 million tonnes by 2036, with cell materials making up more than 70% of that mass, and silicon anode content rising materially only in the back half of the forecast window [S2]. A procurement team locking a 2027-2028 pack should expect silicon-blend anodes to remain a premium option, not a default, and should size thermal-runaway mitigation around LFP or NMC811 baseline chemistries.
Standards, regulation, and the 2026 demand floor
Regulation is uneven across the three main markets, and that unevenness sets the floor under CTP/CTB volumes. China stayed above 50% battery-electric and plug-in hybrid share of new car sales in 2025; the EU mandated a 15% cut in average new-vehicle CO2 from 2025 but relaxed the previously planned 2035 ICE phase-out in December 2025; the US Inflation Reduction Act's $7,500 EV tax credit ended in September 2025 [S2]. The combined effect is that the demand engine is now primarily Chinese, with Europe and North America running on regulatory minimums rather than incentives [S2].
For pack engineers, that translates into a clear sourcing signal: LFP large prismatic CTP remains the lowest-risk 2026-2028 platform for any program shipping in volume, while CTB should be treated as a structural-feature bet that requires a body-in-white co-design commitment with the cell supplier and the body shop. Specifying a 400V architecture still gives access to the broadest CTP supplier base; 800V is a separate procurement decision driven by charging-time targets, not by pack architecture choice [S4][S5].
Failure modes and constraints engineers should price in
CTP and CTB packs are harder to service: a single damaged cell in a CTB pack typically means replacing the structural pack, not a $200 module, which shifts the warranty reserve and the insurance write-off economics [S4][S1].
Crashworthiness is the third constraint. CTB turns the pack into a load path, so a side-pole impact loads the cells directly; the reinforcement that enables the body-in-white role also makes the pack heavier per kWh at the pack level, even though vehicle-level density is higher [S4]. For a fleet buyer weighing CTP versus CTB, the decision usually comes down to whether the platform's volume can absorb a more expensive repair network.
2026 procurement checklist
Specify cell format, not just cell chemistry: large prismatic or 46x cylindrical is a hard prerequisite for any CTP or CTB award [S4]. Require the supplier to disclose the cell-to-pack volume ratio, the cell-to-pack mass ratio, the cooling interface (cold plate vs immersion vs air), and the structural-pack validation report if CTB is on the table. Lock the chemistry family to LFP for cost-default programs and to NMC811 or higher for premium CTB builds, and treat silicon-blend anodes as a 2028+ optionality, not a 2026 baseline [S2].
Trackable signals through the next 12 months: the DENZA Z9GT Blade Gen 2 in-service reliability data, the next-generation 800V CTP platforms from CATL and SVOLT, and whether any non-Chinese OEM commits a 2027 model year to a true structural CTB rather than a CTM-derivative. IDTechEx's 11.8% CAGR through 2036 and a 2034 cell-to-body market projection near $50.76B both point the same direction: the question for 2027 sourcing is no longer whether CTP and CTB win, but which supplier owns the structural-pack co-design with your body shop [S2][S6].
The underlying component specifications are covered under load cell, and load cell module.
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