Yokohama — Kanagawa Diagnostics Works
Yokohama, Kanagawa facility: diagnostics centre running module-level SOH, impedance and optical grading to split reuse from refining. Rated at 21,000 tonnes per annum and operating since 2020.
Annual capacity
21,000 TPA
Operating lines
3
Cities collected
3
In operation since
2020
About the Yokohama, Kanagawa facility
Yokohama is a major port and industrial city in the Tokyo metropolitan region, home to vehicle maker headquarters and engineering centres. The diagnostics works opened on Daikoku Pier in 2020 to grade Japanese packs, including those from some of the earliest mass-market EVs, which have built up many years of real-world use. Its catchment covers the greater Tokyo region. It opened as those early fleets began retiring.
With 21,000 TPA of capacity, the works tests fleet, dealer and engineering packs as well as hybrid modules. The long service histories of Japanese EVs give the site unusually rich data on how packs age, which improves grading accuracy for older batteries and informs decisions about second-life use. Reusable modules are released for second-life builds, and the rest are sent for processing.
What arrives at the gate
What sets this site apart
Long-life EV data
Experience with Japanese EV packs that have many years of service.
Port location
On Daikoku Pier with direct shipping access.
Engineering support
Handles test packs from Japanese developers.
What happens to material here
- 1
Intake & safety triage
Packs are logged, thermally imaged and screened for swelling, coolant ingress or venting before entering the bench area.
- 2
Controlled de-energising
Residual energy is discharged to a safe state of charge with regenerative load banks and recorded per serial number.
- 3
Module-level capacity test
Full charge-discharge cycling at C/3 establishes usable capacity, internal resistance and cell-to-cell balance.
- 4
EIS fingerprinting
1 mHz–10 kHz impedance sweeps separate SEI growth, lithium plating and contact resistance degradation modes.
- 5
AI optical inspection
Machine-vision inspection of busbars, welds and cell cans flags mechanical defects that block second-life reuse.
- 6
Grade assignment
Grade A (≥85% SOH), B (75–85%), C (65–75%) and D routes are assigned, with D-grade material released to refining.
Where material goes next
| Role | Facility | Distance |
|---|---|---|
| Second-Life BESS Works | Gothenburg — Nordic Second-Life Campus | 8,567 km |
| Hydrometallurgical Refinery | Ningde — Fujian Refining Base | 2,142 km |
| Integrated Recovery Campus | Ulsan — Korea Recovery Campus | 935 km |
Local rules
Act on the Promotion of Effective Utilization of Resources and the End-of-Life Vehicle Recycling Act · Ministry of Economy, Trade and Industry (METI) and Ministry of the Environment
The works operates under Japanese waste and recycling laws, including the rules for end-of-life vehicle recycling. Transport follows Japanese dangerous goods regulations.
Before you book into Yokohama, Kanagawa
- Provide serial lists and vehicle information.
- Engineering packs need architecture details.
- Damaged packs require declaration.
- Port-linked shipments need documents in advance.
Damaged or defective packs are handled under a separate quarantine protocol — flag them in the form and the team calls you back the same day.
Yokohama, Kanagawa site: common questions
Does Yokohama grade older EV packs?
Yes, including batteries from early mass-market EVs.
Can packs be shipped from Yokohama?
Yes, subject to transport and waste rules.
What are the opening hours at Yokohama, Kanagawa?
Monday to Friday 08:00 – 20:00, Saturday 08:00 – 16:00. Sunday: emergency and damaged-pack intake only, by prior booking.
How do I book a collection into Yokohama, Kanagawa?
Use the booking button on this page with pack counts, chemistry and condition. The despatch desk confirms a window within one working day and ships UN-approved packaging before collection.