What This Plate Does and Why It Matters for Your Battery Pack This is a stainless steel power spring contact stamped battery connector plate — a single-piece metal stamping that holds power spring c
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What This Plate Does and Why It Matters for Your Battery Pack This is a stainless steel power spring contact stamped battery connector plate — a single-piece metal stamping that holds power spring c
This is a stainless steel power spring contact stamped battery connector plate — a single-piece metal stamping that holds power spring contacts in place while carrying current between cells in a battery pack. You get repeatable contact pressure and electrical continuity across thousands of cycles because we hold flatness to 0.02 mm and contact surface roughness to Ra 0.4 µm. Average lead time is 15 days after drawing approval, and parts come out at 42–48 HRC when we use hardened 301 stainless, so they resist deformation under constant spring load.
Thin stainless (0.15 mm to 0.8 mm) wants to warp during stamping and after heat treatment. We counter that with a two-step progressive die that does blanking, coining, and forming in one pass, then a secondary stress-relief anneal at 400°C for 2 hours. This keeps the contact fingers parallel to the base plate within 0.02 mm total runout — measured on a CMM, not a feeler gauge. For high-cycle battery applications, we can add a micro-shot peening step to close micro-cracks on the bend radius, which pushes fatigue life past 10,000 insertion cycles.
We stock three grades for this part: 301 full-hard stainless (standard, 48 HRC), 304 annealed (for deep-drawn pockets, 20 HRC max), and 430 ferritic (for cost-sensitive consumer packs, 85 HRB). If you need a specific temper, we can order it — but 301 full-hard is the default because it gives the best spring-back repeatability at ±0.5° bend angle. For corrosion resistance in humid environments, we offer passivation to ASTM A967, which removes free iron and leaves a chrome oxide layer without changing dimensions.
| Parameter | Value / Range | Notes |
|---|---|---|
| Material | 301 SS (full-hard), 304, 430 | ASTM A240 certified |
| Thickness | 0.15 – 0.8 mm | ±0.01 mm per sheet |
| Hardness | 42–48 HRC (301) | Vickers 430–500 HV |
| Dimensional tolerance | ±0.01 mm (critical), ±0.05 mm (general) | Per ISO 2768-mK |
| Surface finish (Ra) | 0.4 µm (contact area), 0.8 µm (rest) | Measured per ASME B46.1 |
| Flatness | 0.02 mm max | On a 50 mm × 50 mm area |
| Runout (contact fingers) | 0.02 mm total | Relative to base plane |
| Bend angle accuracy | ±0.5° | Spring-back compensated in die |
| Lead time | 12–15 days (tooled), 25 days (new die) | From drawing approval |
| MOQ | No MOQ for standard sizes | Sample orders accepted |
| Packaging | Anti-static trays, reel or tube | Per EIA-481 for SMT |
Every batch gets a First Article Inspection (FAI) with 15 points recorded — that includes contact force at 0.5 mm deflection, surface roughness on the mating face, and flatness on a granite table. In-process, we use a high-speed camera at 200 frames per second to catch burr formation on the blanking edge before it exceeds 0.03 mm. Final QC checks 5 pieces per lot for dimensional compliance and 100% of parts for visible cracks using a 10× loupe. If you request it, we include a CMM report with X-Y-Z coordinates for all critical features — that report is free with orders over 5,000 pieces.
The plate’s stamped pockets are designed to nest a power spring contact with a press-fit retention force of 5–8 N, so the contact doesn’t shift during vibration (we test to 10 G RMS from 10–2000 Hz). The base plate thickness determines the current-carrying cross-section — for a 10 A continuous load, use 0.3 mm or thicker in 301 SS. If you’re pairing this with a nickel-plated contact, our passivation step keeps the stainless surface passive, preventing galvanic corrosion at the junction. We also add a laser-etched part number and batch code on the non-contact side — that costs nothing extra and helps you trace failures to a specific heat lot.
For high volume (over 100,000 parts), we use a progressive die with 16 stations — that includes pilot holes, coining, forming, and cut-off. This gives you a part cost of $0.03–$0.08 depending on thickness and finish. For medium runs (5,000–50,000), we use a multi-slide former that eliminates the carrier strip, reducing material waste by 15% compared to a progressive die. We keep 12 standard die sets for common battery sizes (18650, 21700, 26650) — if your part fits one of those, tooling cost is zero and lead time drops to 7 days. For custom shapes, a new die costs $1,200–$3,500 and takes 3 weeks to build and validate.
No MOQ — we accept one-piece samples for verification, and production pricing starts at 500 pieces.
Yes, we adjust the die geometry for custom finger length, width, and bend angle within 0.1 mm increments — just send your drawing or a sketch with critical dimensions.
We use SPC (Statistical Process Control) on critical dimensions, plus 100% visual inspection and a 5-piece CMM audit per lot, with reports available on request.
For a new die: 25 days from drawing approval to first shipment; for an existing die: 12–15 days; for standard sizes in stock: 5 days.
We reply with a firm price and lead time within 12 hours of receiving your RFQ. Email your drawing (STEP, DXF, or PDF) to sc@bquq.com or reach us on WhatsApp at +86 13713157787. This is precision manufacturing, made in China with 20 years of stamping experience — we’ve shipped over 40 million battery connector plates without a single field failure. If you’re still selecting the right material or finish, read our CNC cutting tool selection guide for die maintenance tips, or check the CNC machining tolerances guide to see what we can hold on your next project. No MOQ, no runaround — just a quote you can take to your purchasing team.
| Parameter | Capability |
|---|---|
| Materials | SPCC, SGCC, SUS301/304/316, brass, copper, beryllium copper, phosphor bronze |
| Process | Progressive die stamping, fine blanking, deep drawing, bending, tapping |
| Tolerance | ±0.01mm standard, ±0.005mm on request |
| Surface | Zinc plating, nickel, tin, gold, powder coating, passivation, anodizing |
| Die Size | Up to 1200 x 800 mm, 16-250 ton presses |
| Thickness | 0.05 - 6.0 mm sheet metal, wire 0.1 - 8.0 mm |
| Prototype | 7-15 days tooling, no MOQ on samples |
| Inspection | Full report per batch, CMM and optical measurement |
