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New Energy Enclosures: Sealing Faces and Flatness Before Style

An inverter or ESS enclosure is judged by whether it keeps water out and heat moving. The gasket groove, the machined sealing face and the mounting flatness decide that — and all three are machining results on an extruded body.

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Thin-wall aluminum section of the type supplied for battery and inverter enclosures
Enclosure alloy
6063-T5 / T6
Structural alloy
6061-T6
Machined faces
±0.01 mm
Wall
0.3 mm min.
The challenge

Three constraints that decide an energy enclosure

None of these are cosmetic. Each one turns into a failed ingress test or a thermal problem in the field.

01

A gasket groove that has to seal

The groove depth and the sealing face flatness work together. Machine one without the other and the gasket either does not compress or over-compresses on a long side.

Machined face ±0.01 mm
02

Flatness over a long extrusion

A profile that measures well at 300 mm can bow over 1,200 mm. Mounting rails and lid faces need flatness agreed per part, not per profile.

Flatness agreed per part
03

Heat with nowhere to go

Power electronics need a thermal path. Adding a separate heat sink creates an interface; extruding fins into the body removes it.

Fins extruded with the body
The answer

How the route answers them

Extrusion gives the section; machining makes the sealing interface; inspection proves both before the carton closes.

  1. Fins formed in the die

    Cooling fins are extruded with the housing at 3–6 mm pitch, so there is no thermal interface between body and heat sink and no second part to bolt on.

  2. Gasket groove and face machined together

    The groove and the mating face are cut in one setup where geometry allows, so depth and flatness come from the same reference. Send the gasket drawing and we will machine to it.

  3. 6061-T6 where strength matters

    Battery frames, mounting brackets and structural members are specified in 6061-T6 and machined on extruded blanks, with flatness and hole position agreed at DFM.

  4. Inspection before packing

    Sealing faces and mounting holes are measured on the finished lot, before anodizing where the coating would change the reading.

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Typical parts

Parts we quote for energy programmes

Part families we quote for this industry. Client names are withheld; the process facts are ours.

  • Inverter housing Machined sealing face
  • Battery pack frame 6061-T6
  • ESS enclosure Fins in body
  • EV charger body Gasket groove
  • Power module housing Thermal base
  • Mounting bracket Flatness critical
Programs

Closest published programs

We have not published a new-energy case study yet. These two programs share the process challenges — long-part flatness, thermal path and 6061-T6 structure — so they are the honest reference.

6061-T6 Structural Parts

Flatness and hole position on a large structural assembly in 6061-T6.

6061-T6

Read the case study

Integrated Heat-Sink Housing

Fins extruded with the body, removing a separate heat sink and its interface.

Profile ±0.05 mm

Read the case study

Spec highlights — New Energy

  • Enclosure bodies in 6063-T5 / T6, structures in 6061-T6
  • Machined sealing faces and grooves to ±0.01 mm
  • Bore and OD ±0.04 mm
  • Cooling fins extruded at 3–6 mm pitch
  • Wall down to 0.3 mm, ±0.02 mm capability on thin-wall sections
  • Die in 4–5 days; production as fast as 24 h after sample approval
Constraints

What we do not cover

  • Ingress or IP certification testing — we machine the interface, you test the assembly
  • Die-cast and forged components — we quote and manage them, but they are not run in-house
  • Welded or fabricated sheet-metal enclosures
  • Cell-level or battery-management electronics

We will machine the groove and the face to the gasket drawing and report the dimensions. The IP test itself belongs to the assembled unit, and we would rather say that than imply a rating we cannot issue.

FAQ

Energy enclosure questions

What sourcing and mechanical teams ask first on this kind of programme.

Can you machine a gasket groove to a sealing spec?

Yes. Send the gasket drawing or the groove geometry and we machine to it, holding ±0.01 mm on the groove and the mating face. We do not test or certify IP ratings — that is done on the assembled unit.

Why extrusion instead of a welded sheet-metal box?

A single extruded section removes the weld seams that become leak paths, and gives you a machining datum for the sealing face. The trade-off is that the section must be constant along one axis; complex 3D shapes still need fabrication or casting.

Can you supply structural parts in 6061-T6 as well as enclosures?

Yes. 6061-T6 is our structural alloy for brackets, frames and mounting members, machined on extruded blanks or plate. Flatness and hole position are agreed per part at DFM.

Send the Enclosure or the Frame Drawing

Include the gasket geometry, the mounting flatness that matters and the annual quantity. We will confirm which of the two routes — extrusion plus machining, or machining only — actually holds your tolerance.

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What to send

  • 2D drawing or 3D model (STEP, IGES, DWG, DXF, PDF)
  • Alloy and temper
  • Surface finish and color
  • Estimated annual quantity