Why design decides end-of-life value
A pack that has to be cut apart arrives at the refinery as mixed scrap, whatever its remaining capacity. A pack that can be opened with hand tools and split into modules can be graded, and the best modules can be sold for stationary storage at several times their black mass value. That difference is fixed by the engineering team years earlier, through choices about adhesives, potting compounds, fastener types and how the busbars are routed.
The EU Battery Regulation (EU) 2023/1542 already points in this direction. It requires that portable and light means of transport batteries become removable and replaceable, and it asks for information on dismantling to be available to recyclers. Traction packs are not held to the same removability rules, but the direction of travel is clear and design-for-recycling is becoming a procurement question as well as an engineering one.
The ten rules
The list below is drawn from what slows our disassembly lines down most often. None of the rules asks an engineer to give up energy density or crash performance. They ask for the same discipline that makes a pack serviceable in a workshop, applied with the assumption that someone will need to take it apart safely with a clear record of what is inside.
Structural packs, where cells carry mechanical load, make several of these rules harder to follow. In those designs the priority shifts to cell-level access and labelling, because module harvesting is often impractical and the value case moves to clean, well-documented refining feed.
- Avoid structural adhesive between cells where a mechanical clamp will do
- Standardise fastener heads and keep them reachable from one side
- Label chemistry, nominal voltage and cell supplier on every module
- Route the service disconnect so it is reachable without removing covers
- Keep coolant lines on quick-release couplings that seal when parted
- Expose module-level voltage sense points for testing without the BMS
- Avoid potting compounds over busbars and cell terminals
- Keep plastics to a small number of identifiable, marked grades
- Publish a dismantling sequence and torque sheet for recyclers
- Make BMS history readable with a documented, non-proprietary interface
Data belongs in the design brief
Recyclers price packs on measured state of health, but measurement is faster and fairer when the pack can report its own history. Cycle counts, peak temperatures, fault codes and cell imbalance logs let a grading bench decide which modules deserve a full capacity test and which can go straight to refining. Without that data, every module has to be tested from scratch.
The same data is the backbone of the EU battery passport, which applies to EV batteries placed on the EU market from February 2027. Designing the BMS so that passport-relevant fields can be exported at end of life avoids expensive retrofit work, and it gives the owner a stronger position when negotiating residual value.