Battery liquid cooling pltaes are mainly used in passenger cars, commercial vehicles and energy storage.

Currently on the market for energy storage\power liquid cooling mainstream program is to place the liquid cooling plate at the bottom of the battery cell. The pain point is the thermal resistance of the electric core itself. The use of liquid cooling/ heating response is slower, and the bottom of the electric core area is small, resulting in a small area of the cold plate heat transfer.

With Tesla cylindrical battery models, CTAL Kirin batteries, energy storage and high-magnification battery cells more times of charging and discharging, more and more car companies/energy storage companies will be placed on the side of the liquid cooling plate and the battery cell. The liquid cooling plate is placed in the middle of the cell, so that the heat exchange area is expanded by many times, and the large surface cooling of the cell reduces the temperature control time of the cell by half. In extreme cases, such as the occurrence of thermal runaway, the cell can quickly cool down and effectively block the abnormal heat conduction between the cells. At the same time, the liquid cooling effect is significantly enhanced, improving safety and fast charging performance. The side cooling program not only solves the temperature difference between different cells in the battery pack, but also solves the problem of excessive temperature difference between the top and bottom of the battery.

Characteristics of Side Liquid Cooling Plates

Side liquid cooling plate process is mainly raw material stamping,cleaning,coating brazing agent,riveting,brazing,testing,sealing compound and other major processes, general liquid cooling plate production technology process has buried tube process, Machining + welding, die-casting + welding.

Buried tube process

The tube process is the most commonly used liquid cooling plate production process, generally speaking, aluminum substrate buried copper tube, that is, aluminum substrate with CNC milling groove, and then the stamping machine will have a good shape of the copper tube pressed to the aluminum substrate, and then brazed welding, and then processed into liquid cooling plate.

The extrusion process is used to directly form the cooling plate runner, and then through the machine to open the cycle, usually using friction welding, brazing welding and other welding processes to seal. This process has high production efficiency and low cost.It is not suitable for applications with excessive heat dissipation density, and is not suitable for application conditions where too many screw holes on the surface limit the direction of the channel or reduce reliability.

Mainly used in: power battery water cooling heating device, water distribution box and standard power module integrated heat dissipation products.

Machining + Welding

The liquid cooling plate adopts the method of machine addition, and the internal flow path size and path can be freely designed, which is suitable for thermal management products with large power density, irregular heat source layout and space limitation. It is mainly used in: Wind power converters, photovoltaic inverters, IGBTs, motor controllers, lasers, energy storage power supplies, supercomputing servers and other fields of heat dissipation product design, but in the power battery system less application.

Die casting + welding

Die casting process is a very mature and widely used molding method, with the rapid development of new energy vehicles, become the motor controller, power battery pack tray and cooling box into mass production of the preferred way, but need to control die-casting impurities, pores and other problems in the process, conservative use of sealing ring or friction welding method. It is necessary to improve the reliability of the process to avoid liquid leakage problems.

Die casting and rewelding, good process control, and stable process, with batch delivery capability. In addition to the friction welding process, some liquid cooling plates will also use brazing or vacuum brazing welding processes.