New Energy Water-Cooled Plate Brazing Technology: Atmosphere Brazing Furnace Application in Power Battery Industry

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New Energy Water-Cooled Plate Brazing Technology: Atmosphere Brazing Furnace Application in Power Battery Industry

1. Industry Background: Thermal Management Demand and Brazing Process Status

1.1 Core Value of Water-Cooled Plate in New Energy Battery Systems
Aluminum water-cooled plate is the core heat dissipation carrier of power battery thermal management system, whose brazing quality directly determines battery safety, cycle life and fast charging performance.

With the rapid upgrade of new energy vehicle fast charging technology and large-capacity power batteries, battery heat generation density continues to rise, and liquid cooling has completely replaced traditional air cooling as the mainstream thermal management solution. Aluminum water-cooled plates realize uniform heat conduction and rapid heat dissipation for battery modules through internal micro-channel liquid circulation. They are widely used in vehicle power batteries, energy storage cabinet cooling units, and electric drive control heat dissipation modules. The overall tightness, thermal conductivity and structural stability of the cold plate depend entirely on high-quality brazing technology, which is the key guarantee for long-term safe operation of battery systems.

1.2 Defects of Traditional Cold Plate Welding Processes
Traditional laser welding and ordinary brazing are prone to poor sealing, channel deformation and low thermal conductivity consistency, failing to meet mass production standards for power batteries.
Most new energy cold plates adopt thin-wall aluminum alloy stamping composite structure with dense internal micro-channels. Laser welding has high requirements for assembly clearance and is prone to welding penetration, channel blockage and local thermal deformation. Ordinary open-flame brazing and box furnace brazing cannot effectively remove surface oxide films, resulting in insufficient filler metal wetting, residual pores and weak joint bonding. In actual use, it is easy to cause liquid leakage, uneven heat dissipation and local overheating of the battery, bringing major hidden dangers to battery thermal runaway and service life attenuation.

1.3 Industrial Advantages of Atmosphere Brazing Furnace
Controlled atmosphere brazing technology achieves oxidation-free and high-uniformity integral connection, becoming the standardized mass production process for power battery cold plates.
Different from vacuum brazing’s low efficiency and high cost, professional atmosphere brazing furnaces adopt continuous protective atmosphere heating mode, which can efficiently remove aluminum alloy surface oxide films through precise temperature and atmosphere matching. It realizes full wetting and seamless bonding of brazing filler metal on thin-wall cold plate joints, with uniform heating, small structural deformation and excellent batch consistency. It perfectly adapts to high-volume, low-cost and high-reliability production requirements of new energy battery water-cooled plates, and has become the mainstream supporting equipment for the new energy thermal management component industry.

atmosphere brazing furnace,atmosphere furnace

2. Core Technical Difficulties of New Energy Water-Cooled Plate Brazing

2.1 Aluminum Alloy Oxidation Causes Insufficient Joint Bonding
Aluminum alloy materials easily form dense inert oxide films at room temperature, which hinders brazing filler metal diffusion and causes hidden leakage defects in cold plates.
The surface of aluminum cold plate workpiece naturally generates dense alumina passivation film, which is stable in chemical properties and difficult to remove by ordinary heating processes. During brazing, the oxide film isolates the contact between brazing filler metal and base metal, resulting in incomplete wetting, discontinuous bonding and tiny gap pores at the joint. These microscopic defects will gradually expand under long-term liquid impact and temperature cycle, causing coolant leakage and failure of battery thermal management system.

2.2 Thin-Wall Micro-Channel Structure Is Prone to Thermal Deformation
Thin-wall stamping cold plate has low structural rigidity, and uneven temperature field is easy to cause channel collapse and flatness deviation.
New energy battery cold plates are mostly thin-wall stamped parts with complex internal micro-channel structures. The wall thickness is extremely thin, and the structure is sensitive to temperature changes. Conventional furnace temperature fluctuation and local overheating will cause unbalanced thermal expansion of the cold plate, resulting in micro-deformation of the plate surface, channel shrinkage or collapse. It reduces liquid circulation efficiency, leads to uneven heat dissipation of the battery pack, and seriously affects the consistency of battery cell temperature difference.

2.3 Strict Requirements for Batch Consistency and Sealing Stability
Power battery assembly requires 100% tightness of cold plates, and traditional processes cannot eliminate batch quality fluctuation.
Vehicle-grade and energy-storage-grade water-cooled plates have zero tolerance for leakage defects. Each batch of products requires consistent flatness, channel dimensional accuracy and joint compactness. Ordinary processing equipment has unstable heating atmosphere and inconsistent temperature curves, leading to large differences in brazing quality among batches. Individual workpieces have hidden leakage points, which cannot be fully detected by conventional testing and bring potential safety hazards to battery system assembly.

3. Core Advantages of Atmosphere Brazing Furnace for Cold Plate Production

3.1 Controlled Protective Atmosphere Removes Oxide Films Efficiently
Purified protective atmosphere completely strips aluminum oxide films, ensuring full wetting and high-density bonding of brazing joints.
The atmosphere brazing furnace adopts high-purity nitrogen or mixed protective atmosphere, with precise oxygen and dew point control. In the high-temperature brazing stage, it can effectively decompose and remove the inert oxide layer on the surface of aluminum cold plates without damaging the aluminum base material. The clean joint interface ensures full spreading and penetration of brazing filler metal, eliminates microscopic pores and gaps, and achieves seamless and leak-free integral brazing connection.

3.2 Uniform Linear Temperature Field Controls Micro-Deformation
Full-area balanced heating realizes synchronous temperature rise of cold plates, effectively protecting micro-channel structural accuracy.
The equipment adopts multi-point uniform radiation heating design, with extremely small temperature deviation in the effective working area. It avoids local overheating and thermal stress concentration of thin-wall cold plates, ensures synchronous thermal expansion and stable stress release of the overall structure. It effectively controls plate flatness and internal channel dimensional accuracy, guarantees unobstructed liquid flow and consistent heat dissipation efficiency of each cold plate.

3.3 Continuous Process Improves Mass Production Efficiency
Assembly line continuous brazing mode realizes high-volume and low-cost production, matching the rapid iteration rhythm of new energy industry.
Different from intermittent processing of vacuum furnaces, atmosphere brazing furnaces support continuous feeding, heating, brazing and cooling cycle operation. The production rhythm is stable and efficient, which can meet the large-scale ordering demand of power battery manufacturers. The standardized process parameters ensure highly consistent brazing quality of each workpiece, greatly reduce manual intervention and production cost, and realize stable mass delivery of vehicle-grade cold plates.

3.4 Low-Temperature Gentle Brazing Protects Base Metal Performance
Optimized low-temperature brazing curve avoids aluminum grain coarsening and hardness attenuation, maintaining stable thermal conductivity of cold plates.
Aiming at the low melting point and temperature sensitivity of aluminum alloy materials, the atmosphere brazing furnace adopts customized gentle temperature rise and constant temperature control parameters. It completes high-quality brazing bonding at the optimal temperature threshold, avoids overheating-induced grain coarsening and material softening of aluminum plates, fully retains the high thermal conductivity characteristics of aluminum base materials, and ensures long-term efficient and stable heat dissipation performance of cold plates.

4. Key Application Process and Production Specifications in Power Battery Industry

4.1 Pre-Brazing Precision Cleaning and Assembly Standards
Complete degreasing, decontamination and gap calibration are the premise of leak-free brazing of new energy cold plates.
Before furnace loading, stamping cold plate workpieces and brazing filler metal must undergo strict ultrasonic degreasing and pure water cleaning to completely remove surface oil stains, dust and impurities. After drying, precision assembly and gap calibration are carried out to control the fitting clearance within the process allowable range, avoiding virtual welding and missing welding caused by excessive gaps. Standardized pretreatment and assembly processes eliminate initial defects and lay a foundation for high-quality batch brazing.

4.2 Atmosphere and Dew Point Precision Control
Stable low-dew-point and low-oxygen protective atmosphere ensures continuous and stable oxide removal effect.
During continuous production, strictly control furnace atmosphere purity, oxygen content and dew point indicators. Real-time monitor and dynamically adjust protective gas flow and purification efficiency to avoid atmosphere fluctuation caused by continuous feeding and discharging. Maintain stable oxidation-free processing environment in the furnace at all times, ensure consistent oxide removal and brazing wetting effect for each batch of cold plates, and stabilize product qualification rate.

4.3 Aluminum Cold Plate Exclusive Brazing Curve Matching
Segmented temperature rise, constant temperature brazing and gradient cooling process balance brazing quality and structural accuracy.
Adopt exclusive multi-stage temperature control curve for aluminum cold plates: slow preheating stage removes residual moisture and balances internal and external temperature; medium-temperature transition stage stably eliminates surface stress; high-temperature constant temperature stage ensures full melting and diffusion of brazing filler metal; gradient slow cooling stage releases thermal stress step by step. Avoid rapid temperature change deformation and residual stress concentration, and ensure flatness and dimensional stability of finished cold plates.

4.4 Post-Brazing Cooling and Leakage Detection Management
Standard slow cooling + full-volume tightness testing realizes zero-leakage delivery of battery cold plates.
After brazing, workpieces are cooled gently with the furnace to avoid rapid cooling deformation and internal micro-stress. After cooling to room temperature, each cold plate undergoes strict air tightness testing and water pressure leakage detection to screen out workpieces with tiny hidden defects. Establish batch production and testing files to ensure traceable quality of each product, meeting the vehicle-grade reliability standards of power battery supporting parts.

5. Industry Application and Future Development Trend
Atmosphere brazing furnace has become the core mainstream equipment for mass production of new energy power battery water-cooled plates.
As new energy vehicles and large-scale energy storage industries continue to expand, the demand for high-reliability and low-cost thermal management cold plates is exploding. Atmosphere brazing technology solves the pain points of low efficiency, high cost and unstable quality of traditional processes, and has outstanding advantages in batch production capacity and product consistency. It has been fully popularized in the supporting supply chain of mainstream battery and vehicle manufacturers, and has become the standard process for cold plate manufacturing.

Intelligent atmosphere control and ultra-precision process optimization will further improve the high-end manufacturing level of battery cold plates.
In the future, atmosphere brazing furnaces will develop towards full intelligent parameter adjustment, automatic assembly line matching and ultra-low dew point precise control. The continuous optimization of aluminum alloy exclusive brazing process will further reduce product deformation rate and leakage rate, improve cold plate heat dissipation efficiency and service life, and strongly support the upgrading of high-power fast-charging batteries and large-scale energy storage thermal management systems.

Zhengzhou Protech Technology Co.,LTD is a professional manufacturer specializing in tube furnaces, muffle furnaces, atmosphere furnaces, and vacuum furnaces. We are committed to providing targeted solutions to meet your diverse heating equipment needs.
For customized heating solutions tailored to your specific requirements, feel free to get in touch with us:
WhatsApp: +86 17719806024
Email: info@lab-furnace.com

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New Energy Water-Cooled Plate Brazing Technology: Atmosphere Brazing Furnace Application in Power Battery Industry

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