Nous sommes responsables de la construction-----nous sommes responsables de la fabrication-----nous sommes responsables de la formation
BESS cabinets, battery enclosures and charger housings in 1.5–2.0 mm — flat enough to seal, fast enough to keep up with a product range that changes every quarter.
Energy storage and EV charging enclosures sit at the heavy end of the thin-sheet window. Cabinet bodies, doors and internal partitions are typically 1.5 to 2.0 mm cold-rolled or galvanised steel, because the enclosure carries weight, resists impact and has to seal to an IP rating. That thickness makes the frame choice non-negotiable: a cast-iron frame panel bender is rated to 2.0 mm cold-rolled at full bend length, a welded frame only to 1.5 mm.
The other defining feature is change. Product generations in this sector turn over faster than in any traditional cabinet industry, and enclosure designs are revised while the first batch is still shipping. That rules out anything tool-dependent. A Poinçonneuse à tourelle CNC produces cable entries, ventilation patterns, fan cut-outs, busbar clearances and mounting arrays without dedicated dies; a cintreuse de panneaux forms the four-sided panels from a program; both switch to a revised drawing in minutes rather than through a tooling order.
STON CNC (Qingdao Ston Mechanical Technology Co., Ltd.) is a Chinese original manufacturer of CNC panel benders and turret punch presses, founded in 2006 in Qingdao, China. All equipment described here is built inside STON CNC's own 20,000㎡ factory, from casting and heat treatment through machining, assembly and inspection. Machines carry ISO 9001 quality certification and CE marking under Machinery Directive 2006/42/EC, and are exported to more than 80 countries. View certifications and patents →
Battery and charger enclosures concentrate their sheet metal in a small number of large, thick-gauge panels that must stay flat enough for a gasket to seal against.
A door that bows by two millimetres will not seal, whatever gasket you specify, and the ingress test fails at the corners first. Closed-loop servo bending with rapid compensation adjustment holds angle across the full length, and straightness of roughly 0.2 mm/m keeps the sealing face straight enough for compression to be even along the whole channel.
Cell formats, converter footprints and connector positions move between product generations. Any process that requires a dedicated die per hole pattern becomes a schedule risk. Turret punching and program-driven bending absorb a revised drawing in an afternoon; the constraint becomes engineering time, not tooling lead time.
A cast-iron frame panel bender reaches 2.0 mm cold-rolled at full bend length; a welded frame stops at 1.5 mm. Enclosure specifications regularly drift to 2.5 or 3 mm for structural bases and outdoor cabinets. Those parts belong on a press brake, and we confirm which of your parts fall on each side before quoting.
This sector rewards flexibility over raw throughput. Most customers are better served by a cell that absorbs design changes than by a line optimised for a product that may be superseded.
The thickness row is where most enquiries in this sector fall over. Outdoor and structural enclosure parts drift above the panel bender window more often than customers expect.
| Paramètres | Panel bender — cast frame | Panel bender — welded frame | Notes |
|---|---|---|---|
| Cold-rolled / galvanised | ≤2.0 mm | ≤1.5 mm | Above 2.0 mm goes to a press brake |
| Stainless steel | ≤1.2 mm | ≤1.0 mm | For outdoor and coastal enclosures |
| Aluminium | ≤2.5 mm | ≤2.5 mm | Alloy dependent |
| Max forming size | 1000 × 1000 up to 2800 × 1500 mm | By model | |
| Bending height | 5 mm minimum / 170, 300 or 400 mm maximum | By configuration | |
| Min four-sided inner size | approx. 140 × 190 mm | Busbar shrouds may fall below this | |
| Angle accuracy | approx. ±0.5°/m | Decides gasket compression evenness | |
| Straightness | approx. 0.2 mm/m | Decides whether the door seals | |
| Punching accuracy | ±0.1 mm on turret punch press | Repeatability approx. ±0.01–0.02 mm | |
| Utilities | Three-phase 380 V, 0.6 MPa air | Configured to destination voltage | |
Four-sided cabinet bodies, doors and partitions in 1.5–2.0 mm, with dense cut-out patterns that change between product generations. The combination of thick-gauge forming and tooling-free punching is exactly what this sector needs.
Deep-drawn battery module shells, extruded heat sink profiles, roll-formed frame sections, and any structural part above 2.0 mm cold-rolled at full bend length. Different processes and in most cases different suppliers.
Structural bases in 2.5–3 mm, lifting lugs, heavy mounting brackets and thick reinforcement plates. Every enclosure factory we work with keeps a press brake for precisely these.
Risk assessment follows EN ISO 12100; safety-related control functions such as light-curtain interruption and emergency stop are specified to EN ISO 13849-1. Hydraulic press brakes supplied into the EU are built against EN 12622. Machines placed on the EU market carry CE marking under Machinery Directive 2006/42/EC with the accompanying technical file. Quality management is certified to ISO 9001, and machined structural tolerances follow ISO 2768. For the finished enclosure, IEC 60529 defines the IP code your cabinet is tested against and IEC 61439-1 applies to low-voltage assemblies. Neither is a machine standard — but the flatness and angle consistency needed to pass an ingress test are established at the bending stage, not at final assembly.
On the machines this means fully enclosed rear fencing, protective covers on all protruding moving parts, laser guarding that halts motion when the protected zone is broken, over-tonnage protection on turret punch presses, and grating-ruler offset-load detection on panel benders.
Enclosure ranges usually need the first two. The third supplies parts you will keep buying in.
| Cintreuse de panneaux CNC | Presse plieuse CNC | Roll forming | |
|---|---|---|---|
| Part geometry | Flat panels folded on all four sides | Any bend line, any thickness in capacity | Constant cross-section profiles |
| Typical enclosure parts | Cabinet bodies, doors, partitions, trays | Structural bases, lugs, heavy brackets | Frame members, mounting rails |
| Thickness for this sector | ≤2.0 mm cold-rolled | 2.0 mm and above | Set by the roll set |
| Sealing-face straightness | approx. 0.2 mm/m | Crowning and operator dependent | Excellent, but fixed section |
| Response to a design revision | Program change, minutes | Tool change and gauge reset | New roll set, weeks |
| Operators | 1, or 0 with automatic loading | 1–2 | 1 per line |
| Does STON supply it? | Yes | Yes | No — different process |
Battery module trays are worth checking early. A folded tray suits a panel bender; a drawn shell does not, and no amount of tooling will change that. We separate the two at drawing review.
Figures below describe the direction and mechanism of the change. Actual results depend on your part mix, batch size and shift pattern — we model them against your own drawings before quoting.
| Item | Press brakes only | Turret punch plus panel bender cell |
|---|---|---|
| Operators on a 2 mm cabinet panel | 2, lifting and turning | 1, or unattended with loading |
| Door sealing-face straightness | Crowning and operator dependent | approx. 0.2 mm/m |
| IP test failures at corners | Common when angle drifts between panels | Reduced by closed-loop angle control |
| Response to a design revision | Re-tooling and re-proving | Program change, same day |
| Cut-outs per panel | Laser plus manual secondary operations | One clamping on the turret punch |
| Changeover between models | Tool swap and gauge reset | Program recall plus compensation adjustment |
| Parts above 2.0 mm | Handled | Stay on the press brake |
Payback logic we use with customers: (annual labour released + reduction in rework and scrap + additional saleable output) ÷ installed equipment cost. We build this with your real numbers rather than publishing a headline figure that would not match your plant.
Cast-iron frame models rated to 2.0 mm cold-rolled at full bend length. Full-electric servo closed-loop control, rapid compensation adjustment, grating-ruler offset-load detection, custom knives for gasket channel profiles.
View press arm type →
Cable entries, ventilation patterns, fan cut-outs, busbar clearances and mounting arrays in one clamping, without dedicated dies. ±0.1 mm accuracy, turret speed to 40 rpm, over-tonnage protection.
View SF series →
Repeating hole patterns and one-off contours on the same panel in a single clamping. Roughly 40% less floor space than separate machines, and no secondary alignment between the array and the cut-out.
View SFL series →
For structural bases, lifting lugs and reinforcement plates above the panel bender window. 63 t to 320 t, DELEM or ESA control, mechanical compensation, laser protection device.
View PBS series →
Exchange-table fiber laser for prototypes, first articles and revised drawings that arrive faster than tooling can be ordered. Burr-free edges on coated and galvanised sheet.
View laser unit →
Native interface on every panel bender, compatible with most robotic arm and gantry brands. On 2 mm panels the weight alone justifies removing the manual lift.
View truss system →Founded in 2006 and headquartered in Qingdao, one hour from major export ports and the airport. Casting, heat treatment, machining, welding, assembly and inspection all happen inside our own 20,000㎡ factory. That is why a configuration change for a battery enclosure line does not become a six-month subcontracting problem.
Energy storage projects run to grid connection dates and charger rollouts run to site handover. A stopped cell delays an installation schedule, not just a production plan.
Specifications on this page verified against STON engineering documentation on 4 August 2026. Forming limits are confirmed against your own drawings before quotation. Published on 4 August 2026 · Last updated 4 August 2026 · Reviewed by Vicky Xu, Head of Overseas Sales.
Two things decide the machine: your heaviest gauge and your largest panel. Send those and we come back within 24 hours with a configuration and a clear split between bender and press brake work.
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