Do Pure-EV Car Carriers Change the Risk?

Both — and in opposite directions. A carmaker's own car carrier hauls a cargo that is near-entirely electrified, which concentrates the fire load far beyond a mixed third-party run. But because the operator built the cars and owns the ship, it also knows the chemistry, state of charge and condition of every unit — the opposite of the blind manifest a common carrier works with. BYD now runs eight owned car carriers, the largest holding 9,200 vehicles across 16 decks. The concentration cuts both ways.

What has actually changed

Vehicle manufacturers have stopped chartering space and started owning ships. BYD took delivery of its first owned pure car and truck carrier, BYD Hefei, and by late 2025 operated a fleet of eight large car carriers said to give it capacity to export on the order of a million cars a year. Its BYD Shenzhen — named in April 2025 and sailing its maiden voyage to Brazil — is the largest-capacity vehicle carrier yet built, with 9,200 car spaces across 16 decks, one of a four-ship Deltamarin-designed class. It is not alone: Chery and JAC formed a ro-ro joint venture with Anhui Provincial Port and Shipping Group and ordered LNG dual-fuel 7,000-CEU PCTCs. The structural shift is that the cargo owner and the ship owner are now the same company — and the cargo is overwhelmingly its own battery-electric and plug-in-hybrid vehicles.

Why concentration raises the fire load

A near-all-EV cargo changes the numbers a fire depends on. A conventional PCTC on a finished-vehicle trade carries a minority of battery-electric units — the Fremantle Highway held 498 BEVs among 3,783 vehicles, around 13% — while a carmaker-EV carrier approaches full electrification. Multiply the lithium-pack count per deck and you raise three things at once: the total stored electrochemical energy aboard, the probability that any given ignition involves a battery rather than a fuel-and-ignition-source combination, and the density of adjacent packs available for cell-to-cell and vehicle-to-vehicle propagation. The hazard per vehicle is unchanged; the hazard per deck, and per hull, is not.

Why the same ship is the best-informed operator afloat

Vertical integration is the antidote to the problem that makes third-party car-carrier fires so hard to price. On a mixed common-carrier PCTC, IMDG Special Provision 961 exempts the vehicles from declaration, so the ship sails without chemistry, verified state of charge or damage history for its lithium cargo. A carmaker carrying its own cars on its own ship has none of that blindness: it manufactured the packs, it knows the exact cell chemistry and battery-management behaviour, it can set and enforce a low state-of-charge ceiling at loading as a matter of internal policy, and it controls the condition of every unit because it built and inspected it. The best-informed cargo operator at sea is the one that also owns the manifest — and, increasingly, that is a Chinese EV maker on its own hull.

What it still does not solve

Knowing the cargo at loading is not the same as detecting the cell that fails in transit. A perfectly characterised, low-charge, single-chemistry cargo still carries a non-zero per-cell failure rate, and with several thousand packs concentrated on one hull, the expected number of in-transit faults per voyage rises with the count, not the ignorance. The state-of-charge cap and the known chemistry lower the severity if an event starts; they do not detect it starting. So the concentration raises the marginal value of per-vehicle detection precisely on the ships best placed to know their cargo — and for underwriters it raises a separate flag: an all-EV carrier is a concentrated accumulation risk, a single hull whose worst-case single-event exposure is larger than a mixed vessel's, however well its operator understands the batteries.

What it means for owners, insurers and OEMs

• For the OEM-operator: your loading knowledge is a genuine advantage — a policy state-of-charge cap and known chemistry are levers a common carrier does not have. Use them, but do not mistake characterisation for detection; the failing cell still needs to be seen at sea.
• For underwriters: price the concentration, not just the operator. A near-100% EV hull is a larger single-event accumulation than a 13%-BEV mixed carrier, even with a better-informed loading process behind it.
• For common carriers watching the shift: the OEM fleets are setting a data benchmark — chemistry and SoC known at loading — that a third-party ship under SP 961 cannot match without contracting for the same information.
• For everyone: the detection case strengthens as cargo electrifies. Concentration multiplies the packs that can fail and the packs a fire can spread to, which is an argument for per-vehicle monitoring regardless of how much the operator knows at the ramp.

Sources

• Maritime Executive — 'Chinese EV Manufacturer BYD Takes Delivery of Largest Capacity Car Carrier' / Marine Link coverage of BYD Shenzhen: 9,200 standard car spaces across 16 decks, named April 2025 in Yizheng, maiden voyage to Brazil, one of a four-ship Deltamarin-designed class built by CMJL Nanjing and CMHI Jiangsu, operated with China Merchants — maritime-executive.com / marinelink.com.
• Automotive Logistics — 'BYD and other Chinese OEMs accelerate vertical integration with dedicated ro-ro fleets': BYD's owned PCTCs (BYD Hefei as first owned, ~7,000 units) and the Chery/JAC joint venture with Anhui Provincial Port and Shipping Group ordering LNG dual-fuel 7,000-CEU PCTCs from Wuhu Shipyard — automotivelogistics.media. [VERIFY: confirm the JV/order details and hull names against the source before publish.]
• South China Morning Post / carnewschina — BYD's car-carrier fleet reaching eight vessels and roughly one-million-car annual export capacity by late 2025 — scmp.com / carnewschina.com. [VERIFY: fleet count and the ~1M-cars-per-year figure are from trade/business press; confirm the current number before publish.]
• Dutch Safety Board / EMSA reporting on the Fremantle Highway (2023): 3,783 vehicles aboard including 498 battery-electric vehicles (~13%) — the mixed-cargo BEV share used here as the comparator against a near-fully-electric OEM carrier.
• IMDG Code Special Provision 961: vehicles on ro-ro ships with flag-approved vehicle spaces are exempt from declaration where conditions are met — the reason a common carrier lacks the chemistry/SoC knowledge an OEM has on its own ships — imo.org.
• Companion RoRoSAFE analysis — 'Chinese EV Export Surge: Car-Carrier Fire Exposure' (the volume side of the same trend), 'The EV Percentage Tipping Point' (what rising BEV share does to fire risk), and 'Is a Car Carrier a Floating Accumulation Risk?' (the underwriting accumulation angle).