New energy metal parts should normally include a clear quality document package covering material identity, dimensional inspection, surface treatment, traceability, and any customer-specific compliance requirements. I recommend starting with the approved drawing and purchase specification, then adding the material certificate, certificate of conformity, inspection report, and process or treatment records that apply to the part. For higher-risk battery, vehicle, charging, and energy-storage components, the package may also include a control plan, first article inspection report, welding records, or PPAP documentation. The exact documents should be agreed before production because no single package fits every metal fabrication project.
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At Jinhui, I treat quality documentation as part of the manufactured product rather than as an administrative afterthought. A useful document package should allow a buyer to answer three questions: what was made, what material and processes were used, and whether the finished part meets the approved requirements. This approach supports receiving inspection, production traceability, supplier evaluation, and corrective-action management.
The approved drawing is the primary reference for dimensions, tolerances, materials, surface requirements, hole patterns, welding symbols, and revision status. I recommend confirming that the supplier is working from the latest revision and that any marked critical characteristics are clearly identified. If the purchase order contains requirements that are not shown on the drawing, those requirements should be included in a controlled specification or quality agreement.
A controlled drawing also reduces disputes during inspection. For example, a drawing may define a sheet thickness of 1.5 mm, a positional tolerance, or a specific flatness requirement, but the acceptance criteria must be measurable and unambiguous. Without a current revision and agreed measurement method, even accurate inspection results may be difficult to interpret.
A material certificate confirms the material grade, product form, heat or batch reference, and relevant chemical or mechanical properties when those details are required. For fabricated parts used in battery enclosures, busbar supports, charging equipment, or structural assemblies, the material record helps verify that the supplied metal matches the approved specification. Common information may include alloy or steel grade, thickness, temper, heat number, and supplier identification.
The required certificate level depends on the application and contract. A general enclosure may need material identification and batch traceability, while a safety-related or highly controlled assembly may require a certificate with test values and a stronger chain of custody. I advise buyers to define the required certificate format before order placement instead of assuming that every supplier provides the same level of evidence.
A dimensional inspection report records whether the completed part conforms to the drawing. It should identify the part number, revision, inspection equipment or method, measured values, nominal values, tolerances, and pass-or-fail results. Critical dimensions such as mounting holes, sealing surfaces, bend locations, connector openings, and interface points deserve particular attention because they can affect assembly performance.
For complex sheet-metal or machined parts, the buyer may request a first article inspection report that covers all drawing characteristics. For repeat production, a reduced inspection plan may be acceptable if it is approved by the customer and supported by process controls. As a practical example, a surface-treatment specification might require an 80 μm coating thickness, but the report should state where and how that value was measured rather than presenting an unsupported declaration.
A certificate of conformity, or CoC, is a supplier statement that the delivered parts meet the agreed purchase order, drawing, and specification. It normally includes the supplier name, part number, quantity, production batch, document references, and authorized approval. The CoC is useful for receiving inspection because it provides a concise link between the shipment and the quality records.
A CoC should not replace objective inspection evidence when the project requires measurements or test results. I use it as a summary document that points to the supporting material, dimensional, treatment, and process records. Buyers should also confirm whether the CoC must be supplied with every shipment or only with the first article and defined production batches.
New energy metal parts may use anodizing, plating, powder coating, passivation, painting, deburring, polishing, or other finishing processes. The relevant record can include treatment type, color or appearance requirement, coating thickness, adhesion result, corrosion-related requirement, batch number, and subcontractor information. These records are especially important when the finish supports electrical isolation, corrosion resistance, grounding, or visual identification.
Not every project requires the same test report. I recommend matching the record to the actual specification and risk: a visual acceptance record may be sufficient for a basic interior bracket, while a sealed enclosure or exposed charging component may require documented coating thickness and functional checks. If finishing is outsourced, the buyer should request traceability between the subcontractor report and the delivered part batch.
For welded frames, battery trays, cooling structures, and other joined assemblies, the quality package may include welding procedure information, welder qualification evidence, weld inspection results, and repair records when applicable. The appropriate level depends on the joint design, customer specification, and consequences of failure. Visual inspection may be required for all parts, while additional non-destructive testing should only be claimed when it has actually been performed and documented.
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Joining records should identify the assembly, weld location or reference, inspection status, and any deviations. If the design includes leak-tight or pressure-related performance, the buyer may also require a documented leak test with the approved test method and acceptance limit. I recommend defining these requirements before fabrication because they can affect tooling, fixtures, operator skills, and production timing.
Depending on the destination market and customer requirements, buyers may request declarations related to restricted substances, conflict minerals, recycled content, packaging, or environmental rules. A supplier should provide only the declarations that are relevant to the material, process, and sales region. A declaration is not the same as a certification, so its scope and supporting basis should be stated clearly.
For example, if a coating, plating, adhesive, or lubricant is used, its chemical composition may need review under the buyer’s restricted-substance policy. I recommend providing the applicable supplier declaration or technical data rather than making a broad statement that the entire product is compliant with every regulation. The final obligation usually depends on the customer’s contract, product classification, and market of use.
| Project Stage | Recommended Documents | Buyer’s Main Purpose |
|---|---|---|
| Before production | Approved drawing, specifications, control plan, sample approval requirements | Confirm the supplier understands the design and acceptance criteria |
| First article or prototype | Material certificate, first article inspection report, process records, photos if requested | Validate design fit, manufacturing method, and measurable quality |
| Mass production | Certificate of conformity, batch inspection report, treatment records, traceability data | Release shipments and connect parts to production batches |
| Nonconformance or change | Deviation request, corrective-action report, revised approval record | Control risk and prevent unauthorized changes |
This staged approach avoids requesting every possible document for every order. It also gives the supplier a practical quality plan that can be priced and scheduled. If the buyer requires document retention for 12 months, 5 years, or another period, that requirement should be written into the quality agreement because retention periods are not universal.
Every document should relate to the same part number, revision, production batch, and shipment where applicable. I recommend checking that the material heat number, inspection batch, treatment batch, and CoC are not contradictory. Missing signatures, unclear revisions, or copied values without measurement locations can reduce the practical value of an otherwise complete package.
Inspection data is meaningful only when the measurement method is suitable for the characteristic. Buyers should confirm whether dimensions were checked with calipers, gauges, a coordinate measuring machine, optical equipment, or another approved method. For surface finish, coating thickness, flatness, and electrical continuity, the method and acceptance limit should be stated whenever they influence product acceptance.
A supplier should not silently substitute material, alter a finishing supplier, change a forming method, or modify a critical process when the change can affect fit or performance. I recommend requiring written approval for deviations and keeping the approved decision with the shipment records. This is particularly important for new energy parts that interface with cells, cooling systems, high-voltage components, or vehicle structures.
These mistakes are often caused by unclear purchasing documents rather than intentional nonconformance. A simple quality-document matrix can identify who prepares, reviews, approves, and retains each record. I suggest using that matrix during quotation so document effort, testing, and lead time are visible before the purchase order is released.
When I work with a buyer on new energy metal fabrication parts, I first align the drawing revision, material, process route, inspection points, and required submission format. Jinhui can organize a project-specific document package around the parts being quoted, such as sheet-metal enclosures, brackets, frames, machined components, or fabricated assemblies. The available records should be confirmed according to the actual process, customer specification, and agreed inspection plan.
For a useful quotation, buyers should provide the 2D drawing or 3D model, material and finish requirements, annual or batch quantity, destination market, critical characteristics, and requested quality documents. If a first article, PPAP-style submission, special test, or traceability period is required, I recommend stating it at the inquiry stage. This allows us to evaluate manufacturability, inspection resources, subcontracted treatments, packaging, and delivery expectations together.
The essential quality documents for new energy metal parts are usually an approved drawing, material certificate, dimensional inspection report, certificate of conformity, and applicable surface-treatment or process records. Higher-risk or customer-controlled parts may additionally require first article inspection, control plans, joining records, compliance declarations, traceability data, and approved deviation records. The correct package is determined by the part’s function, risk, destination, contract, and manufacturing process—not by a universal checklist.
To move forward, I recommend creating a document matrix before sourcing, marking critical characteristics on the drawing, and defining the required records for prototype, first article, and repeat production. Send Jinhui your drawings, material and finish requirements, target quantities, and quality expectations so we can review the fabrication route and propose a practical documentation package for your new energy metal parts.
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