I. Common Quality Issues with Energy Storage Terminals
Quality issues regarding energy storage terminals (wiring terminals, connection terminals, high-current terminals) generally fall into six categories. First, copper adulteration—using recycled scrap copper instead of high-purity red copper or oxygen-free copper; high impurity levels and poor conductivity lead to overheating, oxidation, and blackening under high-current conditions, creating electrical hazards.
Second, insufficient plating thickness—while compliant terminals feature a uniform tin plating layer (≥3 microns), low-cost products have extremely thin plating that rusts quickly in salt spray tests and fails rapidly in humid cabinet environments. Third, substandard mechanical properties—reduced copper tube wall thickness results in insufficient pull-out resistance after crimping, causing cables to detach during transport vibrations and leading to power outages or short circuits. Fourth, falsified certification documents or model mismatches—claiming CE/RoHS compliance while the model in the test report differs from the actual product supplied. Fifth, inconsistent batch quality—submitted samples pass inspection, yet the materials and dimensions of mass-supplied goods show significant fluctuations. Sixth, inferior insulation sleeves—using recycled plastic with poor flame retardancy, leading to shrinkage, cracking, and insulation failure at high temperatures.
Identifying these issues is a prerequisite for processing returns or exchanges.
II.
Quality Assessment Standards and Indicators
Decisions regarding the return or exchange of energy storage terminals should be based on objective indicators, referencing requirements such as the group standard T/GDWCA “Wire Harnesses and Connectors for Electric Energy Storage Systems.”
Key specifications include: Appearance and structure—clear and secure product markings, accessible surfaces free of burrs or flash, and connections free of looseness or breakage; Electrical performance—withstands a 1-minute withstand voltage test without breakdown or flashover, leakage current <10 mA, and insulation resistance ≥100 MΩ; Connection strength—minimum tensile strength for terminal-to-cable connections varies by wire gauge (e.g., ≥270 N for 4 mm², ≥450 N for 6 mm², ≥500 N for 10 mm²); Environmental adaptability—low-temperature, high-temperature, and salt spray tests conducted in accordance with GB/T 34131. Material specifications: Copper content ≥99.9% (high-purity red copper/oxygen-free copper), tin plating thickness ≥3 μm (no corrosion after 96 hours of salt spray), contact resistance typically ≤0.5–1.2 mΩ, and insulation material rated UL94 V-0 for flame retardancy.
Factory inspections and type tests are distinguished; type tests are performed every two years or upon design changes. Terminals for energy storage applications (DC 1500V, 15A–630A) are subject to stricter requirements regarding temperature rise, insulation, and creepage distance.
III.
Return and Exchange Process and Timelines
For returns and exchanges due to quality issues with energy storage terminals, the process and timelines are critical.
Standard industry practice involves organizing a quality acceptance check promptly upon delivery, adhering to the “inspect before use” principle.
Objections regarding surface quality (such as appearance) should generally be raised within 3 days of receipt. Objections regarding inspection results must be submitted in writing as a re-inspection request within 15 days of receiving the test results; failure to do so implies acceptance of the results, and the re-inspection outcome serves as the final conclusion.
Conditions for returns and exchanges are determined by the contract. The buyer has the right to request a return, exchange, or replacement—and to claim compensation for losses—in the event of manufacturing or process defects such as material non-compliance (e.g., using recycled mixed copper instead of pure copper), insufficient plating thickness, excessive contact resistance, failure to meet tensile strength standards, mismatches between certification data and model numbers, or inconsistent batch performance.
The standard warranty period is typically one year (e.g., for manufacturers like Greida); manufacturing defects not caused by human error during this period qualify for free return or exchange.
To process a return or exchange, the following must be prepared: the purchase order and invoice, product model and batch number, photos upon arrival and inspection reports, and a description of the fault. Before returning items to the factory for inspection, the power must be disconnected, the sample sealed, and return authorization obtained.
IV.
Re-inspection and Dispute Resolution
If a disagreement arises regarding the return or exchange of energy storage terminals, the process proceeds to re-inspection and dispute resolution.
Re-inspection rules: If the applicant disputes the initial inspection results, they must submit a written request for re-inspection within 15 days of receiving the notification and complete the necessary procedures within 7 days of receiving the re-inspection notice; failure to do so constitutes a waiver of the right to re-inspection. Re-inspection utilizes the sealed backup sample, and the resulting conclusion is final. The cost of re-inspection is borne by the applicant if the result matches the initial inspection, or by the original inspection agency if it differs.
In the event of a dispute regarding quality, the assessment provided by a mutually selected third-party testing agency holding CMA certification shall prevail, with the assessment costs borne by the party found liable.
Determination priority: Compliance is based on applicable standards (e.g., T/GDWCA, IEC 60998, UL 1059) and contractual agreements; if explicitly stated quality requirements exceed mandatory standards, the stated requirements apply; if they fall below mandatory standards, the mandatory standards apply.
It should be noted that a buyer’s acceptance of products following a successful spot check does not constitute acceptance of or a change to quality standards, and the buyer retains the right to hold the supplier liable for breach of contract; liability may still be pursued for latent batch defects discovered during use.
It is recommended that the contract clearly specify the allocation of costs, shipping fees, and timeframes for “returns/exchanges within the warranty period” and “repairs outside the warranty period.”
V. Recommendations for Prevention and Procurement
Minimizing the return and replacement of energy storage terminals relies primarily on prevention at the source.
Five key points are recommended: First, identify the original manufacturer—require evidence such as workshop footage, test reports, and patent certificates; verify capabilities regarding injection molding, stamping, and testing equipment; and request records of raw material inspections and outgoing product spot checks for every batch. Second, incorporate quality clauses into the contract—clearly define execution standards, batch definitions, sampling plans, acceptance criteria (including copper content, plating thickness, contact resistance, tensile strength, and salt spray resistance), time limits for raising objections, re-inspection rules, and consequences for returns, replacements, or breaches of contract. Third, inspect upon delivery before use—verify the consistency of the “three documents” (material certification, labeling, and the physical product) and commission third-party re-inspection for critical parameters (material composition, plating, contact resistance, tensile strength, and insulation/flame retardancy). Fourth, verify operational compatibility—ensure the terminal’s rated current is at least 1.25 times the cable’s current-carrying capacity (with a 20%–30% derating margin), ensure voltage ratings and creepage distances match 1500V DC energy storage systems, and select materials such as high-purity red copper or oxygen-free copper with tin or silver plating, along with UL94 V-0 flame-retardant ratings. Fifth, maintain full-chain records—ensure traceability across the order, packaging, batch, Material Test Certificate (MTC), and inspection reports to provide evidence for potential returns or replacements.
Selecting certified manufacturers that hold ISO 9001/IATF 16949 accreditation and possess comprehensive testing capabilities can significantly reduce the frequency of quality-related disputes.
Conclusion
How should returns and replacements for energy storage terminal quality issues be handled?
Remember the process and timeframes: inspect before use; raise objections regarding appearance within 3 days;
submit written requests for re-inspection of test results within 15 days; accept re-inspection results as final; and resolve disagreements through assessment by a mutually selected third party. Evaluate parameters such as material composition, plating, contact resistance, and tensile strength based on “standards + contract” terms; the standard warranty period is typically one year, and non-conforming products are subject to return, replacement, or claims as stipulated in the contract.
By incorporating quality clauses into contracts, inspecting goods upon arrival before use, and sourcing directly from the original manufacturer, the energy storage terminal—a critical node for energy connection—can ensure greater reliability and minimize disputes.
