As battery densities soar and charging rates break records, managing heat inside Li-ion and Solid-State battery cells has become the primary bottleneck in EV engineering. Zhejiang Rock Auto Co., Ltd. delivers customized OEM/ODM thermal solutions that eliminate thermal runaway risks and maximize service life.
In modern high-performance electric vehicles (EVs) and heavy-duty grid energy storage systems (BESS), cells operate under intense duty cycles. Without optimal thermal management, heat generation leads to capacity degradation, accelerated aging, or in catastrophic scenarios, thermal runaway. This makes the engineering of battery cooling plates, cooling tubes, and structural heat exchangers paramount. Designing these systems requires deep domain expertise in fluid dynamics, materials science, and precision metallurgy.
Zhejiang Rock Auto Co., Ltd. addresses these demands with high-strength, lightweight aluminum alloys manufactured to sub-millimeter tolerances. By utilizing specialized alloys like 6061-T6 or clad 3003 series brazing sheets, we create channels that optimize coolant flow while maintaining minimal structural thickness. This balance delivers excellent heat transfer coefficients and minimizes the weight of the cooling assembly, which directly translates to extended range and enhanced payload capacities for electric vehicles.
Engineered fluid channels ensure precise surface temperature uniformity across all cells, limiting localized hotspots to under 2°C to prevent thermal propagation.
Advanced extruded profiles allow for low-pressure-drop, multi-port mini channels, optimizing heat transfer with minimal coolant pump work.
Utilizing high-strength materials (6061-T6 and 3000-series alloys) to reduce system dead-weight while guaranteeing high mechanical pressure thresholds.
Established
Years of R&D Experience
ISO/TS Certified Quality
Precision Machining Tolerance
Zhejiang Rock Auto Co., Ltd. does not believe in "one-size-fits-all" cooling. Every battery architecture—whether cylindrical, prismatic, or pouch—requires a tailored thermal management strategy. We work with engineering teams to design, simulate, prototype, and scale specialized cooling solutions.
Zhejiang Rock Auto combines high manufacturing capacity with strict raw material control to secure your cooling system supply chain.
In the lithium-ion battery sector, supply chain delays can hold up whole production lines. Located in the industrial heart of Zhejiang, China, our manufacturing facility benefits from direct supply chains for high-purity aluminum alloys, chemical flux, and mechanical processing tooling. This geographic integration lets us maintain competitive pricing without compromising on quality.
Our manufacturing capabilities cover the entire production cycle, from structural simulation and alloy selection to stamping, brazing, surface treatment, and final leak testing. We utilize high-temperature Controlled Atmosphere Brazing (CAB) furnaces, dedicated fin mills, and core assembly machinery. This machinery ensures that every joint of our microchannel tubes and cooling plates achieves a seamless metallurgical bond, minimizing thermal resistance and preventing potential coolant leaks over long operation spans.
Thermal CFD analysis and FEA modeling of flow rates and structural stresses to optimize channel geometries before cutting metal.
Designing and manufacturing progressive dies and stamping molds in-house (tolerances up to ±0.05mm) for repeatable high-rate production.
Brazing in an oxygen-free, inert nitrogen atmosphere CAB furnace to produce clean, high-strength, flux-free joints.
Subjecting 100% of finished cooling components to helium mass spectrometer leak detection, validating seal integrity for automotive deployment.
Operating globally requires compliance with regional safety, environmental, and quality frameworks. Zhejiang Rock Auto supports your certification and compliance needs.
As an ISO/TS 16949 certified manufacturer, our production processes follow strict quality management systems (QMS). We assist global automotive OEMs and grid-scale ESS integrators in meeting local regulations. Whether verifying material compositions under RoHS and REACH declarations or providing structural documentation for UL9540A energy storage fire safety certifications, our team supplies the technical data packages you need.
Our engineering support extends to on-site local installation validation and rapid prototyping. We help resolve complex mechanical integration issues, including galvanic corrosion prevention, coolant compatibility validation, and vibration isolation. This comprehensive approach ensures that our battery cooling systems perform reliably under diverse operational conditions, from hot desert solar arrays to cold maritime hybrid drivetrains.
Get answers to technical and supply chain questions from our engineering team.
We primarily use 3003, 3003-clad (with 4343/4045 brazing layers), and 6061-T6 aluminum alloys. The 3000 series offers excellent corrosion resistance and forming characteristics, making it suitable for brazed cold plates. The 6061-T6 alloy is chosen for structural plates requiring high yield strength and close dimensional tolerances (down to ±0.05mm) to withstand mechanical assembly stresses.
Our quality control protocol includes 100% helium mass spectrometer leak testing. This technique detects microscopic leaks down to 1x10^-6 mbar·l/s, which is more sensitive than bubble testing or pressure decay methods. We also run thermal shock cycles (-40°C to 120°C) and vibration testing to ensure structural integrity over automotive lifetimes.
Yes, we specialize in OEM/ODM customization. You can supply your STEP/IGES files, and our engineering team will perform Design for Manufacturability (DFM) reviews. We optimize the channels for stamping or extrusion draft angles, coordinate brazing lines, and recommend cost-effective tooling layouts to bring your thermal designs to production.
For initial functional prototypes using soft tooling or CNC machining, lead times are typically 3 to 4 weeks. For high-volume production tooling, including custom progressive die sets and dedicated brazing fixtures, design and qualification take 6 to 8 weeks, followed by sample validation.
We use specialized internal surface coatings, such as chromate-free conversion coatings or anodization, to protect the aluminum matrix. Additionally, we work with customers to ensure their coolant contains appropriate corrosion inhibitors, like organic acid technology (OAT), and advise on isolating connections to prevent electrical contact with more noble metals.
Established in 2007, Zhejiang Rock Auto Co., Ltd. has been a leading manufacturer, exporter, and supplier of high-performance auto cooling system components. We specialize in producing a wide range of automotive cooling solutions, including radiator tubes, intercooler tubes, oil cooler tubes, as well as radiators, intercoolers, and oil coolers.
With more than 15 years of industry experience, Zhejiang Rock Auto has earned a reputation as a pioneer in the design and manufacturing of aluminum-based cooling products. We are committed to providing high-quality, cost-effective, and innovative solutions that meet the rigorous demands of our global customers. Our products are widely used in automobile, heavy industry, shipbuilding, sugar processing, packaging, navigation, molds, and other specialized applications.
At Zhejiang Rock Auto, we pride ourselves on our dedication to excellence and client satisfaction. We approach every project with a well-defined strategy, from initial design to final production, ensuring that our customers receive only the best in terms of quality and performance. Our team continuously works to enhance the efficiency of our products, driven by extensive research and development (R&D) efforts. Through continuous innovation, we develop solutions that meet the evolving needs of the market.
Our R&D unit is the cornerstone of our business, conducting detailed research and surveys to improve the performance and durability of our products. This commitment to innovation allows us to design new products with superior functionality, tailored to the specific needs of our clients. Additionally, we actively explore new applications for our cooling solutions, ensuring we remain at the forefront of the industry.
We are proud to be ISO/TS 16949 certified, and our state-of-the-art manufacturing facility is equipped with advanced technologies, including Brazing Furnaces, Fin Machines, and Core Assembly Machines. Our skilled and experienced team is proficient in all aspects of the manufacturing process, from design to final quality checks, ensuring that every product meets the highest standards.
As a customer-centric company, Zhejiang Rock Auto Co., Ltd. aims to achieve maximum customer satisfaction. We uphold the highest ethical standards in all aspects of our business and are committed to continuous improvement. Our relentless pursuit of excellence has enabled us to expand our presence globally, making us a trusted partner for businesses around the world.
To deliver high-quality and cost-effective cooling solutions that not only meet but exceed customer expectations, while fostering a culture of innovation and sustainability.
To be a global leader in the auto parts industry, recognized for our advanced technologies, outstanding customer service, and environmental stewardship.
Rock Auto
