In Brief
The CATL battery plant in Debrecen, Hungary, is facing significant delays and safety issues even before cell production begins. Nine workers have been exposed to nickel above permitted thresholds, triggering a temporary suspension of three specialized workshops. Although module assembly continues on a dedicated line using cells sourced from other CATL sites, these incidents threaten the supply schedule for major customers such as Mercedes-Benz and BMW. Hungarian authorities are imposing strict requirements and penalties, while CATL must now prioritize addressing safety concerns and permitting issues to stand a chance of meeting its industrial commitments.
Even before producing its first cell, a large European battery factory is already under scrutiny. In Hungary, in Debrecen, nine employees at CATL’s plant recorded elevated nickel exposure. This finding prompted the local occupational safety authority to suspend activities in three workshops. The pause targeted the cell-manufacturing building, a measured halt that comes as the site’s ramp-up already faces delays.
For now, the plant isn’t operating at full tilt. By contrast, CATL is assembling battery modules on a dedicated line. This production uses cells sourced from other sites within the group. This context makes the Debrecen incident particularly sensitive for the CATL Debrecen facility. The site is destined to supply batteries to automakers such as Mercedes-Benz and BMW in the coming years, and its ramp-up timetable is already under strain.
Nickel Exposure: How CATL’s Debrecen Plant Was Partially Halted
The nine nickel-exposure cases were uncovered through biological monitoring tests that began in early June at the site. According to available information, about 400 workers were screened as part of this program. By early August, results showed that nine individuals had nickel levels above the defined thresholds. CATL reported seven of these cases to the occupational safety authority on August 10, with two additional cases disclosed on August 13. This systematic monitoring enabled the timely detection of these exceedances.
Following these disclosures, Hajdú-Bihar County’s occupational safety authority responded with inspections on August 11 and 12. Inspectors found that the workers involved were not adequately protected by personal protective equipment, which is deemed essential for working in those workshops. On August 12 at 10:30 a.m., authorities ordered the halt of operations in three zones of the cell-manufacturing building. The zones include the laser-cutting systems for cathode and anode sheets, as well as the winding of electrode sheets and the drying of cells. The rest of the site was not affected by the decision, and module assembly continued.
A follow-up check confirmed adherence to the suspension. A penalty procedure is underway, though the final amount has not yet been determined. The plant had recently been slapped with an environmental fine of 10 million forints for other permit breaches.
A Strategic Gigafactory for Mercedes-Benz and BMW Batteries
On paper, the Debrecen site is meant to become a key European hub for CATL. The first phase of the cell plant was designed for an annual capacity of around 40 GWh. The total announced investment exceeds €7.6 billion. CATL had indicated that mass production of cells was expected to start in March or April 2026, a timeline that has already slipped. The cell production building is complete, but cell production has not yet begun. The 5 GWh-per-year module line has been running since May, relying on cells sourced from other CATL plants. At this stage, there are no details about follow-up symptoms for the nine workers involved.
These delays are already weighing on the factory’s automotive customers. The batteries for Mercedes-Benz’s new electric VLE van were initially slated to be produced in Debrecen, but are now being supplied from China, with CATL covering the extra costs associated with this reorganization. BMW has not yet been affected; the automaker is still set to receive Debrecen cells beginning in 2027.
Alongside the nickel investigation, regulatory procedures are proceeding. On August 19, authorities rejected the permit for the second phase of the cell-building expansion because a building was inaccurately represented on the site plan. On August 25, after missing documents were supplied, the permit for the first phase was granted. Hungarian authorities emphasize a willingness to enforce very strict standards for this plant. For CATL, the immediate priority is to address the safety and permitting shortcomings. It remains unknown whether the three-zone work ban will delay the start of cell production.
In the long term, CATL plans to expand the site’s capacity to 100 GWh per year.
Comparative Table
| Indicator | Detail |
|---|---|
| Final planned capacity (annual) | 100 GWh |
| First-phase capacity (annual) | 40 GWh |
| Total announced investment | €7.6 billion |
| Module line in operation | 5 GWh/year (since May, using imported cells) |
| Number of workers tested for nickel | ~400 |
| Number of nickel overexposure cases | 9 |
| Recent environmental fine | 10 million forints |
| Initial expected cell production start | March/April 2026 |
Key Takeaways
- The CATL Debrecen plant was partially suspended after nine workers were found with nickel overexposure.
- Three workshops in the cell-building facility were temporarily closed by local authorities.
- The site aims for 40 GWh/year in the first phase and a final goal of 100 GWh/year.
- Module production (5 GWh/year) is underway, but cells come from other group plants.
- The delay is impacting battery supply for Mercedes-Benz, but BMW has not yet been affected.
- The plant has already been hit with a €10 million forint environmental fine for permit breaches.
- Hungarian authorities are tightening oversight on safety and permits at the site.
FAQ
Why was CATL’s Debrecen plant partially closed?
Nine workers were found with nickel overexposure, prompting the suspension of activities in three workshops by the Hungarian authorities.
Which zones of the CATL plant are affected by the suspension?
The suspended zones cover laser cutting of cathode and anode sheets, as well as winding and drying of cells in the cell manufacturing building.
Is the incident impacting the delivery of batteries to automakers?
Yes, the start of cell production is delayed and some Mercedes-Benz batteries have had to be supplied from China. BMW is not yet affected.
What is the total planned investment for the Debrecen plant?
The total investment for CATL’s Debrecen giga-factory is about €7.6 billion.
What annual capacity is planned for the first phase?
The first phase targets an annual capacity of around 40 GWh of cells.
Has the plant been fined?
Yes, the plant has received an environmental fine of 10 million forints for permit-related breaches.
