Battery Passport Hub

Technical Architecture

The EU Battery Passport is not a PDF uploaded to a government website. It is a decentralized network of interoperable data endpoints hosted by manufacturers themselves.

1. The Decentralized Mandate

The European Commission explicitly rejected building a massive, centralized database to hold the intellectual property of every battery sold in Europe. Instead, the regulation mandates a decentralized architecture.

As the economic operator, you are responsible for hosting the data for every passport you issue. The EU will only maintain a central registry (an index) that verifies the existence of the passport and tracks its status (e.g., active, recalled, recycled).

2. The Resolution Flow

  1. Physical Scan A user scans the physical QR code engraved on the battery.
  2. DNS Resolution The QR code resolves to a URI pointing to the manufacturer's data endpoint.
  3. Authentication (RBAC) The system challenges the user. Are they a general consumer? A certified dismantler with an eIDAS certificate? A market surveillance authority?
  4. Data Delivery The API returns a machine-readable JSON payload containing only the data attributes that the authenticated user's role is permitted to see.

3. Interoperability & Open Standards

You cannot invent your own proprietary API format. The data must be based on open standards to ensure interoperability across the single market. The technical specifications (currently being finalized by bodies like CENELEC and the Global Battery Alliance) will likely mandate:

  • Format: JSON or JSON-LD for linked data.
  • Identifiers: W3C Decentralized Identifiers (DIDs) to cryptographically prove the origin of the data.
  • Semantics: Shared ontologies so that a "Cycle Life" metric is formatted identically whether the battery is from Volvo or Volkswagen.

Common Architecture Mistakes

  • Hardcoding HTML: The regulation requires machine-readable data, not just a pretty webpage. An API is mandatory.
  • Ignoring Uptime SLA: If your server goes down and customs authorities scan a shipment of EVs at the port of Rotterdam, they cannot verify the passports. The shipment could be blocked. High availability is non-negotiable.
  • Poor Access Control: Accidentally exposing Tier 3 cell chemistry formulas (which are restricted to recyclers) to the public web due to a faulty RBAC implementation.

Test Your API Structure

Validate your JSON payload against proposed EU schemas.

Open API Tester