An EV battery housing requires a coordinated design and manufacturing decision. Low-pressure casting and high-pressure die casting should be compared against the same component boundary, geometry, material condition, production plan and approval requirements. Neither route establishes pack-level performance from its process name.
Define the Housing and Supply Boundary
State whether the RFQ covers a tray, frame, cover, cooling component, structural section or another part. Identify which mating parts, seals, fasteners and joining operations are buyer-owned. A quotation for a casting should not silently become a commitment to a complete battery enclosure or vehicle-level approval.
Supply the controlled model and drawing, including thin and thick sections, internal passages, mounting interfaces and the final pressure or environmental boundary. Identify the requirement owner for structural loading, corrosion, sealing and the assembled pack.
Compare the Proposed Manufacturing Routes
| Decision | Evidence needed from either route |
|---|---|
| Material and condition | Exact alloy/temper, governing requirement and approved substitution rules |
| Filling and solidification | Part-specific process review, tooling assumptions and planned validation |
| Joining | Required weld, adhesive or mechanical-joint interfaces and qualification ownership |
| Machining | Datums, stock, access, distortion considerations and final feature controls |
| Internal quality | Inspection zones, methods, acceptance sources and traceability |
| Volume and schedule | Tooling, trial, sample and release assumptions with responsibilities |
Ask suppliers to explain why their proposed route fits the part, and which design or acceptance questions remain open. A process preference can be an RFQ input, but it should not replace an engineering review.
A General Tolerance Grade Does Not Remove Sealing-Face Machining
General casting tolerances do not establish every flatness, texture, local defect or assembly requirement on a sealing interface. Review those controls independently. Use the actual flange geometry, gasket or seal design, fastening arrangement and final inspection state to decide whether machining is needed.
Do not infer that a nominal DCTG comparison proves an as-cast sealing face will pass, or that it creates a fixed saving per housing. See the drawing and tolerance guide for the information needed to interpret a casting tolerance requirement.
Specify Leak Testing Without a Universal Limit
RFQ CTA
Have a casting project? Submit the RFQ details, then email your drawing for a structured quote review.
Send the drawing, target alloy, finishing scope, MOQ, and delivery timing. Bohua will review it like a real sourcing project, not a generic contact request.
Define the tested boundary, part or assembly condition, method, medium, conditions, stabilization, acceptance and sampling. Separate a housing-level result from a complete pack or vehicle requirement. Where a supplier proposes a different test method, agree the validation needed to show it answers the customer's requirement.
An internal-quality inspection and a functional leak test address different questions. If radiography, CT, sectioning or another method is requested, specify its purpose and scope instead of assuming one method covers all risks.
Make the Cost Comparison Reproducible
Request like-for-like quotes for tooling, casting, heat treatment if specified, machining, joining, finishing, inspection and packaging. Identify scrap/yield assumptions only when they are supported and relevant to the quotation. Treat cost reduction as a project result to be demonstrated, not a general promise attached to LPDC or HPDC.
Document the annual and lifetime quantities, currency, quote date, tool ownership, maintenance, delivery terms and exclusions. Recalculate when the drawing, validation scope or volume changes.
RFQ Checklist
- •Component identity, revision and final supply state.
- •Alloy/temper and applicable material requirements.
- •Critical walls, passages, mounts, datums and seal interfaces.
- •Machining, joining, finish and repair restrictions.
- •Inspection and functional test requirements, with acceptance owners.
- •Prototype, pilot and production quantities and milestone dates.
- •Required records, traceability and engineering-change process.
FAQ
Is LPDC automatically the better battery-housing process?
No. Compare approved proposals for the actual part and program. The route must be supported by design, manufacturing and validation evidence.
Can a supplier promise that sealing faces need no CNC machining?
Only after the relevant feature requirements and route have been verified for that component. A general process comparison cannot make that promise.
Does this guide prove a Bohua battery-housing production program?
No. It explains an RFQ review framework. Submit the drawing and requirements through the EV housing RFQ route for a project-specific capability and scope review.
Project CTA
Ready to Source This Part?
Submit the RFQ details here, then email your drawing for a structured DFM review and quote.