1050 Stamped Brazed Water Cooling Plate 550x380x9mm For 21700 Battery Pack

1050 Stamped Brazed Water Cooling Plate 550x380x9mm For 21700 Battery Pack

This water cooling plate is designed for 21700 battery packs, using a parallel ladder channel so coolant passes under each cell row at a similar velocity. Both halves are stamped from 4.5 mm 1050 aluminum sheet, a high-purity alloy chosen for thermal conductivity, then vacuum brazed into a sealed plate 9 mm thick overall - thin enough to sit between modules without adding stack height.

Key Features

• 1050 high-purity alloy: thermal conductivity prioritized over strength for a thin plate
• Parallel ladder channel: uniform cooling across 21700 cell rows, low pressure drop
• 9 mm overall thickness: minimal stack height in a dense cylindrical cell pack
• Anodizing or insulation film: dielectric layer options for cells bonded directly on the plate
• Custom channel pitch: ladder spacing adjusted to your cell pitch and holder geometry

Technical Specifications

Stamping + Brazing process: why it matters for a water cooling plate

The plate is formed in two stamped aluminum halves whose channel geometry is embossed directly into the sheet, then joined in a single vacuum brazing cycle. Compared with machined or extruded-tube cold plates, the stamped-and-brazed route gives a lighter part, a fully sealed one-piece body with no secondary welding seams, and a channel layout that can be redesigned without new heavy tooling. Vacuum brazing removes the flux residue and oxidation that shorten the life of a liquid circuit, and every plate is pressure tested and helium leak tested before packing.

Surface treatment options

Because the cooling plate sits inside a battery pack, an inverter housing or a charger enclosure, the surface has to do more than look clean. We offer Anodizing (clear / black / hard), powder coating, chromate conversion coating, nickel plating, electrophoresis (E-coat) and sand blasting. Anodizing and chromate conversion are the usual choices for dielectric stand-off against live busbars; powder coating is preferred where the plate is exposed to road spray; nickel plating is used where a glycol-water loop with an aggressive inhibitor package is specified.

Customization: built to your drawing

This water cooling plate is fully customizable. Typical engineering changes include overall length and width, plate thickness, channel pattern and width, inlet and outlet position and thread, connector type (threaded boss, hose barb, quick coupling), mounting hole pattern, fin or pedestal geometry on the contact face, and the final surface finish. Send a 2D drawing or 3D model and our engineering team will confirm brazing feasibility, tooling cost and sample lead time.

Applications

Applied to 21700 cylindrical cell packs in electric two-wheelers, power tools, portable storage and low speed EVs, where the plate is bonded under the cell holders and cell pitch determines the channel layout.

Quality control

Incoming aluminum sheet is verified for alloy and temper, stamped halves are checked against the drawing, and each brazed plate goes through dimensional inspection, internal pressure hold, helium leak detection and a flow and pressure-drop check. Finished parts are packed in export-grade plywood cases with shock-proof foam.

About Trumony

Trumony Aluminum Limited supplies aluminum materials and thermal management components for the new energy industry, covering aluminum sheet, plate, tube, cold plates and battery housings. In-house stamping, vacuum brazing, machining and surface finishing allow us to support customers from design and simulation through tooling, prototyping and serial delivery.

Order and inquiry

Quotations, drawings and samples for this stamped brazed water cooling plate are available on request. Contact us with your cooling load, flow rate and envelope so we can propose the right channel design and surface treatment.