EV Battery Housing Casting: Requirements and Evidence

A battery-housing casting RFQ should make the component boundary and approval responsibilities explicit. The alloy, casting route, heat treatment and inspection plan must follow the specific design and requirements. A generic alloy-family recommendation or test number does not approve a housing for a vehicle program.

Identify the Part and the Final Delivered State

Specify whether the order is for a tray, frame, cover, cooling component, structural member or another casting. State whether the supplier delivers a raw casting, a heat-treated blank, a machined part, a finished component or an assembly. Identify mating parts and work retained by the buyer.

Include the controlled drawing and model, critical interfaces and a requirement list. Separate component acceptance from complete-pack validation, vehicle approval and regulatory responsibilities. Assign the owner of each requirement rather than assuming the casting supplier controls the entire system.

Select an Alloy and Temper Together

Name the governing material requirement, edition, exact grade and delivered condition. If alternatives are permitted, define the approval process and evidence required. Compare chemistry, required properties, casting route, joining, corrosion protection and service conditions.

Do not describe an entire alloy family as universally heat-treatment-free. For example, the Silafont alloy producer discusses both as-cast and heat-treated performance for Silafont-36. That supports checking the exact grade and condition; it does not select a condition for a Bohua project. Use the producer's applicable current data and the customer's approved specification when selecting material.

A proposed casting route should explain its fit to the housing geometry and required evidence. Neither a familiar grade nor a similar-looking sample establishes an approved production process for a new component.

Map Critical Geometry and Joining Interfaces

Identify mounting points, ribs, local walls, cooling passages, sealing lands, cover interfaces and functional datums present in the design. Mark which surfaces remain as cast and which are machined, joined, coated or masked. Specify the final state in which dimensions and functions will be accepted.

For welded or otherwise joined interfaces, define the mating material, preparation, access, joint design and qualification owner. Do not assume weldability or a finished-joint result from the alloy name alone. Repair or impregnation permissions should be agreed explicitly before quotation.

Define Sealing and Inspection by Requirement

Do not transfer a helium leak-rate value directly into an air-decay requirement without an approved correlation or validation basis. Do not impose a universal pressure, leak limit, pore size or inspection frequency on all battery housings. The customer's engineering requirements and agreed method control those decisions.

Plan Samples and Production Approval

State what the first samples must prove: geometry, machining access, material condition, joining, sealing or another function. Identify any differences between development samples and the intended production route. Record what remains to be validated before production approval.

Define the required quality documents and submission scope. An IATF certification claim or a generic PPAP capability statement does not replace the actual part-specific approval package. Verify certificate scope separately and agree the evidence the order requires.

Build a Comparable Quote

Separate tooling, casting, treatment, machining, joining, finishing, inspection and packaging. Include sample, pilot, annual and lifetime volume assumptions, revision control, tool ownership and schedule dependencies. Ask each supplier to return the same list of inclusions, exclusions and open engineering questions.

FAQ

Is one alloy or temper automatically suitable for battery housings?

No. The exact part, joining route, service conditions and approved acceptance requirements determine the choice.

Does a passed casting leak test prove complete-pack sealing?

Only the tested boundary and conditions are evidenced. Pack-level joints, seals and validation remain separately defined responsibilities.

What does Bohua need to review a project?

Send the component drawing/model, material requirements, critical interfaces, expected delivered state, inspection package and quantities through the battery-housing RFQ route. Capability, process selection and approval scope require project review; this guide does not claim an established battery-housing program.