EV Battery Passport — Electric Vehicle Battery DPP Requirements

EV Batteries Get the Most Demanding Passport Requirements

All batteries in scope of EU Regulation 2023/1542 eventually need a digital product passport. But electric vehicle batteries face the most demanding version of that requirement. The combination of high unit value, long service life, complex second-life pathways, and significant environmental impact during both production and end-of-life has driven the Commission to design the EV battery passport as a living, updateable record — not a one-time compliance filing that sits in a database after market placement.

For automotive OEMs and their battery supply chains, this is a materially different compliance challenge than, say, an industrial battery used in stationary storage. The EV battery passport must remain accurate and accessible through the vehicle's ownership lifecycle — multiple owners, multiple countries of registration, possible sale as a used vehicle — and then survive into whatever second-life application the battery enters when it leaves the vehicle. That is a 20-to-30-year data management obligation attached to each individual battery unit, not a product-level certification that expires at point of sale.

This article maps the specific obligations that apply to EV batteries, the obligations that fall on OEMs versus cell and pack suppliers, the state-of-health data requirements that make EV passports uniquely complex, and the practical questions that automotive compliance and supply chain teams need to answer before February 2027.

What Counts as an EV Battery Under the Regulation

The Battery Regulation defines EV batteries as batteries specifically designed to provide traction power to electric road vehicles — passenger cars, light commercial vehicles, trucks, buses, and similar categories covered by the type approval frameworks for road vehicles. The definition covers both fully battery-electric vehicles and plug-in hybrid electric vehicles where the traction battery is above the applicable capacity threshold.

Mild hybrid systems — where a smaller battery supports an internal combustion engine without providing primary traction — are generally classified as industrial or SLI batteries rather than EV batteries, depending on capacity. The 2 kWh threshold for industrial battery passport requirements is the relevant boundary: a mild hybrid battery below 2 kWh may not trigger the same February 2027 deadline as a full EV traction battery, but regulatory classification needs to be confirmed against the specific battery's capacity and intended use case as defined in Article 3 of the regulation.

Two-wheeled electric vehicles and light electric vehicles — e-bikes, electric mopeds, electric scooters — fall under the light means of transport (LMT) battery category, which is subject to battery passport requirements but on a timeline confirmed by delegated act rather than the fixed February 2027 date. OEMs and importers in the micro-mobility and last-mile logistics sector should monitor the delegated act calendar rather than assume either exemption or a 2027 deadline.

EV-Specific Data Fields in the Battery Passport

All battery passports must contain core identity data, carbon footprint declarations, recycled content figures, supply chain due diligence references, and end-of-life information. EV batteries require additional data fields that reflect the specific characteristics of traction battery use — extended service life, dynamic state-of-health, vehicle integration parameters, and second-life readiness data.

Vehicle Integration Data

The EV battery passport must record the vehicle types and models the battery was designed to power. This matters beyond product identity — it determines compatibility for secondary market applications, informs recyclers about the battery's chemistry and cell format (which affects processing route selection), and enables market surveillance authorities to cross-reference passport records against vehicle type approval documentation. Where an OEM sources battery packs from multiple suppliers across model variants, the vehicle integration data in the passport must accurately identify which specific vehicle configuration the battery was type-approved for.

State of Health — The Dynamic Requirement

State of health (SoH) is the most technically distinctive element of the EV battery passport. SoH is an expression of the battery's current condition relative to its original condition — typically expressed as a percentage of original rated capacity at defined discharge conditions — and it changes continuously throughout the battery's operational life as cycles accumulate and degradation progresses.

The regulation requires that SoH data be included in the EV battery passport and updated at defined intervals or trigger events. This makes the EV battery passport genuinely dynamic: unlike the carbon footprint figure, which changes only when supply chain inputs change, the SoH figure changes with every cycle. The regulatory intent is to enable the secondary battery market. A fleet operator acquiring a used EV battery — for a second vehicle or for stationary storage — needs verifiable SoH data to assess residual capacity and value. Without it, they must either conduct expensive physical testing or apply a discount to price in uncertainty.

The battery management system (BMS) is the source of SoH data. Modern BMS firmware tracks cell voltage, temperature, and current at the cell and module level, and calculates capacity fade and impedance rise metrics that map to SoH. The challenge is that BMS SoH algorithms vary by manufacturer — what one BMS reports as 80% SoH may not be directly comparable to another manufacturer's 80% SoH figure, because the underlying calculation methods and reference conditions differ.

The implementing acts under the regulation will specify the SoH calculation methodology and reference conditions that must be used for battery passport reporting. This has significant implications for BMS software development: OEMs and battery system integrators may need to implement a standardised SoH calculation algorithm alongside their proprietary BMS algorithms, or expose a specific set of raw battery parameters that can be used to compute the standardised figure externally. Either way, BMS firmware development roadmaps need to account for the passport SoH reporting requirement from 2027 onwards.

Remaining Useful Life and Second-Life Readiness

Beyond current SoH, the EV battery passport is expected to contain remaining useful life (RUL) projections — estimates of how much additional capacity throughput the battery can deliver before reaching end-of-service threshold. RUL projections are more complex than SoH measurements because they require predictive modelling of degradation rates under assumed future use patterns. The implementing acts will specify what RUL data must be included and at what confidence interval.

Second-life suitability assessments may also be required as part of the end-of-life data layer. A battery with 75% SoH at end-of-vehicle-life may have 10-15 years of viable stationary storage service remaining — but that assessment depends on chemistry, thermal history, and cell-level variation within the pack. The passport's end-of-life data layer, accessible to authorised recyclers and second-life operators, is designed to carry this assessment so that second-life decisions are informed by verified data rather than blanket assumptions.

Capacity and Performance History

Historical performance data — cycle count, cumulative energy throughput, temperature history, high and low voltage excursion events — provides the context that makes SoH and RUL data meaningful. A battery showing 78% SoH with a benign thermal and voltage history is a very different second-life prospect from a battery showing 78% SoH following repeated overtemperature events. The battery passport's data layer for authorised operators is expected to contain this history, drawn from BMS logs, telematics records, or a combination.

Data privacy considerations interact with the performance history requirement in ways that automotive OEMs need to think through carefully. Telematics data collected from vehicles in the field contains information about driving behaviour and location that is personal data under GDPR. Extracting battery performance data for the passport while stripping identifiable personal data requires purpose-specific data architectures — the battery passport data flow cannot simply pull a raw telematics feed.

OEM Obligations vs. Cell and Pack Manufacturer Obligations

The allocation of battery passport obligations across the EV supply chain is one of the most contested questions in industry implementation discussions. The regulation's framework is clear in principle — the manufacturer, as the economic operator placing the battery on the EU market, bears the primary obligation — but the multi-tier structure of EV battery supply chains creates ambiguity about which entity holds the manufacturer role for passport purposes.

Where OEMs Hold the Manufacturer Role

For EV batteries, the legal question is which entity places the battery on the market. In most cases, the OEM places the complete vehicle (including its battery) on the market — the battery is not separately sold to the end customer. In this configuration, the OEM is the responsible economic operator for the battery passport, even if it purchases the battery pack from a tier-one supplier. The OEM's battery passport obligation cannot be transferred to the pack supplier by contract — though the OEM can contractually require the supplier to provide compliant data to populate the passport.

This means OEMs cannot simply require their battery suppliers to "handle compliance" and treat the obligation as discharged. The OEM must maintain a registry record for each EV battery it places on the market, populate it with verified data, ensure the QR code remains functional throughout the vehicle's life, and update the SoH data throughout the battery's operational life. The infrastructure commitment is significant and ongoing — not a point-of-sale compliance exercise.

Where Cell Manufacturers Have a Practical Data Role

Cell manufacturers do not typically hold the manufacturer role for passport purposes — they supply cells to pack assemblers who supply packs to OEMs, and the OEM is the entity placing the battery on the vehicle market. But cell manufacturers hold data that the OEM needs to populate the passport: carbon footprint data for the cell manufacturing stage, recycled content certifications for cathode active materials, and cell-level performance specifications.

This creates a contractual and technical data-sharing obligation that runs up the supply chain. Cell manufacturers must contractually commit to providing the specific data fields the OEM needs for its passport, in the format and frequency the OEM's data management system requires. Standardising what data cell manufacturers provide — and in what schema — is an active work programme in several industry groups including ACEA, CLEPA, and the Global Battery Alliance's Battery Passport working group.

Third-Country Suppliers and Authorised Representatives

Many EV battery cells are manufactured in South Korea, China, and Japan. Where a non-EU cell or pack manufacturer has EU-placed batteries under their name — directly or through an OEM arrangement — the EU importer or the manufacturer's EU Authorised Representative takes on the passport obligations if the non-EU entity does not have an EU-established legal presence. OEMs sourcing from non-EU suppliers need clear contractual frameworks that define who holds the manufacturer role, what data the supplier must provide, and what happens to passport obligations if the supplier relationship ends.

QR Code Durability Over the Vehicle's Life

The QR code requirement for EV batteries has specific durability implications that do not apply in the same way to most other battery categories. A passenger car battery may be in service for 15-20 years, exposed to temperatures from -40°C to 60°C, vibration, moisture, and in-service maintenance operations. The regulation requires the data carrier to remain functional throughout the battery's operational life.

Physical placement of the QR code on the battery module or pack housing requires engineering analysis of exposure conditions and appropriate protective measures — laser-etched codes on metal surfaces, encapsulated printed codes with protective overlays, or codes on dedicated data plates that are accessible for scanning without vehicle disassembly. Battery pack designers who have not previously designed for multi-decade QR code durability need to add this as a design requirement alongside the more familiar EMC, thermal, and safety requirements.

The GS1 Digital Link standard is the recommended technical approach for the URL encoded in the QR code. A GS1 Digital Link URL encodes the unique battery identifier in a structured format that allows the same code to resolve to different data endpoints depending on the scanning context — consumer-facing data versus operator-facing data versus market surveillance data. This is operationally important for EV batteries where the same physical code will be scanned by consumers checking carbon footprint data, service technicians accessing SoH records, and recyclers accessing dismantling instructions over a 20-year period.

Second-Life Economics and the Battery Passport

The secondary EV battery market is currently small relative to its eventual scale, but it is growing rapidly. Batteries removed from end-of-first-life EVs that retain significant capacity — a cohort that will be large by the early 2030s as the first wave of mass-market EVs reaches end-of-vehicle-life — represent a valuable energy storage resource that can be repurposed for stationary storage applications at a fraction of the cost of new storage capacity.

The economic barrier to this market is information asymmetry. A second-life operator purchasing 100 used EV battery packs has no standardised, verified information about the capacity, thermal history, or remaining life of each pack. Testing each pack individually costs time and money. The result is that second-life buyers apply large uncertainty discounts to their offers, reducing the economic incentive for end-of-first-life vehicles to go through reputable take-back channels rather than informal dismantling operations.

The EV battery passport directly addresses this. A battery with a verified, current SoH reading in its passport, a documented thermal history, and a clear cell chemistry record can be valued accurately by a second-life buyer without physical testing. The economic value of verified passport data shows up as a better price for the vehicle's end-of-life battery — which improves the economics of responsible end-of-life processing and increases the volume of material entering compliant recycling channels.

For OEMs, building and maintaining the battery passport infrastructure is not only a compliance obligation — it is a mechanism for demonstrating the sustainability credentials of their vehicles and, eventually, for capturing a share of the value that verified battery data creates in the second-life market. Some OEMs are exploring models where they maintain ownership or oversight of end-of-first-life batteries through take-back programmes, using the passport's SoH data to sort batteries into second-life versus recycling streams and capturing more of the resulting value.

Implementation Checklist for Automotive Compliance Teams

The February 2027 deadline requires parallel workstreams that most automotive compliance teams will need to run simultaneously rather than sequentially. The timeline for designing, validating, and deploying each workstream means none of them can safely be left to 2026.

Confirm the manufacturer role for each EV battery product in the portfolio. Identify which entity — OEM, pack integrator, or cell manufacturer — holds the manufacturer role for passport purposes for each specific battery product. Document the legal basis for that determination.

Establish data supply agreements with tier-one battery suppliers. Cell and pack manufacturers need to agree what data they will provide to the OEM for passport population, in what format, with what frequency, and with what verification. These agreements need to be in contracts, not just project plans.

Engage BMS software teams on the SoH standardisation requirement. BMS firmware needs to implement or expose the SoH calculation methodology specified by the implementing act. This may require firmware development cycles that have 12-18 month lead times in automotive production schedules.

Select and procure DPP registry infrastructure. The EV battery passport registry must handle individual-unit-level records at automotive production volumes, support SoH updates over a 20+ year horizon, and maintain version history for audit purposes. The DPP-Tool platform is built around exactly these requirements — hosted EU-compliant registry infrastructure with individual unit record management, API access for BMS or telematics system integration, and the version control that the regulation's audit trail requirement demands. The available plans cover the per-unit volume and update frequency that EV battery production requires.

Design QR code placement and durability specifications into battery pack mechanical design. This is an engineering requirement that belongs in the pack design spec from the first design cycle, not a retrofit requirement discovered during type approval.

Engage a notified body for carbon footprint and recycled content verification early. Capacity constraints in the verification market mean early contracting gives access to more expert attention and more time to address queries. The verification workstream and the passport data workstream need to converge before February 2027.

The DPP requirements checklist is a practical tool for structuring this implementation programme. The how to create a DPP guide covers the technical implementation steps that apply across battery passport categories, with EV-specific considerations highlighted where they diverge from the general framework.

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