For new energy metal parts, request a document package that connects the approved drawing and purchase order to the material, production lot, inspection results, and shipment. In most cases, this means a controlled drawing or specification, material certificate, certificate of conformity, dimensional inspection report, traceability records, and any process or special-test records required by the part’s function. Add coating, welding, heat-treatment, or other process evidence only when those processes apply. The exact package should be agreed before production, because documentation needs differ between a battery enclosure, a solar mounting component, and a machined machinery part.
At Jinhui, we recommend treating document requirements as part of the technical specification—not as paperwork to request after manufacturing. Buyers can use the checklist below to evaluate a supplier’s evidence and clarify what should accompany each lot.
The drawing and its revision establish what the supplier is expected to make. Confirm that the quotation, purchase order, production documents, and inspection report all refer to the same revision. If the part has a separate specification for surface finish, coating, welding, or testing, identify that document and its revision as well.
Make acceptance criteria explicit rather than relying on phrases such as “standard quality.” For example, a drawing might specify a plate thickness of 2.0 mm, a dimensional tolerance of ±0.1 mm, or a coating thickness of 20 μm. These are illustrative values, not universal requirements; your engineering team should set values appropriate to the design and application.
A material certificate provides evidence about the supplied material, such as its grade and reported chemical or mechanical properties. Check that the grade matches the order and that the certificate can be linked to the material lot used for your parts. Where a particular certificate format or standard is required, name it in the purchase documents and confirm that it applies to the material and supply route.
Do not assume that every metal part needs the same certificate detail. A structural component, a machined bracket, and a thin formed cover may have different material risks and verification needs. If material substitution is not permitted, state that approval is required before any change.
A certificate of conformity (CoC) is the supplier’s written statement that the delivered parts meet the agreed requirements. A useful CoC identifies the supplier, customer order, part number, quantity, applicable drawing revision, and shipment or lot reference. It should not replace inspection evidence when your contract requires measured results.
The inspection report should show which characteristics were checked, the measurement results, the acceptance limits, and the inspection equipment or method where relevant. Ask the supplier to include critical-to-function dimensions and any characteristics that your drawing marks for inspection. A report that only says “passed” may be insufficient if your team needs to review actual measurements or investigate a later issue.
Agree how many pieces are inspected and how sampling is selected. Do not treat a sample quantity as a universal rule: the appropriate plan depends on the part, order, risk, and contract. If you need first-article inspection, specify when it is due and whether production may proceed before approval.
Traceability connects finished parts to production and material records. Ask for a lot or batch identifier on the packaging and in the shipment documents, with records that link it to the relevant material certificate and inspection results. For parts where individual identification is needed, define the marking method and location so it does not interfere with fit, corrosion protection, or appearance.
Request process evidence when a manufacturing step can materially affect the part’s performance or acceptance. Depending on the design, this may include coating or plating records, welding inspection records, heat-treatment documentation, hardness results, leak-test reports, or non-destructive examination results. Specify the applicable procedure, acceptance criteria, and required report content rather than requesting a vague “test certificate.”
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For example, a battery enclosure may need evidence related to dimensional fit, joining, or a specified sealing test, while a solar support component may place greater emphasis on material identification and protective finish. These are possible considerations, not automatic requirements for every product in either category. The engineering specification and intended service conditions should determine what is necessary.
For critical measurements, buyers may ask how the supplier controls and checks the measuring equipment used for inspection. Where required by the quality agreement, request relevant calibration status or records for the instruments supporting acceptance decisions. If a part does not meet a requirement, ask the supplier to document the nonconformance, disposition, and any approved deviation; do not accept a deviation without the required customer authorization.
Start by comparing part number, order number, drawing revision, quantity, and lot identifier across the documents. Names and numbers should agree or be clearly cross-referenced. A complete-looking report is difficult to use if it cannot be tied to the parts in the shipment.
Compare reported results with the limits in the controlling drawing or specification. Confirm that test methods and acceptance criteria match what was agreed, particularly for coating, joining, or functional tests. If a report lists only a pass/fail result, decide whether that level of evidence is sufficient for your risk and receiving process.
State whether documents are required with the quotation, before production, at first-article approval, before shipment, or with the goods. Identify acceptable file formats, language, signatures, and whether originals are needed. This reduces the risk of receiving parts on time but being unable to release them because a required record is missing.
| Document | What it helps verify | Buyer check |
|---|---|---|
| Drawing and specification | Applicable product requirements | Revision matches the order and inspection report |
| Material certificate | Material identity and reported properties | Grade and lot are linked to the supplied parts |
| Certificate of conformity | Supplier’s declaration of compliance | Part, order, quantity, and requirements are identified |
| Inspection and test reports | Measured or tested characteristics | Methods, limits, results, and lot are clear |
| Traceability and process records | Links between parts, materials, and applicable processes | Records cover the processes required by the specification |
A frequent gap is asking for “all quality documents” without listing the required records. Suppliers may interpret that request differently, leading to missing reports or unnecessary paperwork. Another issue is defining a test but omitting the acceptance limit, test method, or point in the process when it must be performed.
Buyers should also avoid treating certificates as a substitute for part-level verification. A material certificate does not establish that the finished component meets its dimensions, and a CoC does not show the actual measurement values unless it includes them. Likewise, a quality-system certificate, when applicable, describes a management-system scope; it is not a product inspection report or proof that a specific shipment conforms.
Not every new energy metal part needs an identical document bundle. Consider the consequence of failure, the part’s function, the manufacturing processes involved, and whether the characteristic can be checked after assembly. A cosmetic cover may need a different inspection emphasis from a load-bearing bracket or a component that forms part of a defined sealing interface.
For repeat orders, agree whether the full package is needed for every shipment or whether some records are retained by the supplier and provided on request. If you choose a reduced shipment package, keep the required retention, retrieval, and change-notification expectations clear in writing. These arrangements should be agreed between buyer and supplier, not assumed.
New energy metal parts should include, at minimum, documentation that identifies the approved requirements, confirms material and order conformity, reports required inspections, and links the supplied lot to relevant records. Add process and special-test evidence where the part design or purchase specification calls for it. Before placing an order, create a document checklist with each record’s required content, format, timing, and applicable lot or revision.
Share that checklist with your manufacturing supplier during quotation and review it together before production begins. At Jinhui, we encourage buyers to provide the latest drawings, material requirements, critical characteristics, and documentation expectations early so the proposed manufacturing and inspection plan can be aligned with the order. Clear requirements make supplier evaluation, receiving inspection, and later quality follow-up more straightforward.
For more information, please visit What Quality Documents Should New Energy Metal Parts Include?.