New energy vehicle liquid cooling plate and energy storage battery liquid cooling plate are important thermal management components in new energy vehicles. Their main role is to control the temperature of the battery and ensure that the battery operates within a safe operating range.The liquid cooling plate of the energy storage battery is similar to the liquid cooling plate of the new energy vehicle, and the temperature of the battery is controlled by circulating liquid (such as water and ethylene glycol). However, the liquid cooling plate of the energy storage battery usually uses more efficient thermal conductivity materials, such as carbon fiber composite materials, to further improve the heat dissipation effect.New energy vehicle liquid cooling plate and energy storage battery liquid cooling plate usually use 3003 aluminum plate as raw material. 3003 aluminum plate is a kind of aluminum manganese alloy, with excellent corrosion resistance, formability and weldability, but also has high strength and thermal conductivity, suitable for the manufacture of new energy vehicles and energy storage batteries of various parts.For new energy vehicle liquid cooling plates and energy storage battery liquid cooling plates, the specification information may vary depending on product design and application needs. Generally speaking, the size of the liquid cooling plate is large, the thickness is between 1.5-3.0 mm, and the width is between 600-1200 mm. In addition, the liquid cooling plate also has a complex flow path design and good thermal conductivity to ensure that the heat generated by the battery can be effectively taken away.The liquid cooling plate of the energy storage battery is usually made of brazed aluminum plate, and its size and shape need to be designed according to the shape and size of the battery. Due to the large weight of the energy storage battery, the liquid cooling plate needs to withstand greater pressure and impact, so it is necessary to choose raw materials with high strength and corrosion resistance. In addition, the brazing process of the liquid cooling plate also needs to be strictly controlled to ensure its air tightness and reliability.In addition to the above specification information, 3003 aluminum plate as a new energy vehicle liquid cooling plate and energy storage battery liquid cooling plate raw materials also has the following product characteristics:Excellent corrosion resistance: 3003 aluminum plate has good corrosion resistance and can adapt to various complex environmental conditions.High strength: 3003 aluminum plate has high strength and can withstand greater pressure and impact.Good formability: 3003 aluminum sheet is easy to process into various shapes and can be used to make a variety of complex parts.Good weldability: The 3003 aluminum plate is easy to weld and can be used to make parts that require welding.

The liquid cooling plate is a cooling component of the power battery pack of new energy vehicles, which is often used at the bottom or side of the battery pack. The liquid circulates through the internal flow channel of the cooling plate, which can take away the excessive heat during the work of the battery pack, so as to achieve safe cooling and avoid the aging of the battery caused by excessive temperature.The liquid cooling plate is usually composed of some thin aluminum alloy heat sink through nesting or welding, etc., and some guiding internal channels are set up inside the plate to guide the fluid cooling medium to take away the heat, but the liquid cooling plate requires strict air tightness testing to ensure the heat dissipation effect and durability.Liquid cooling plate air tightness testing method1. Pressure methodPressure method is also called pressure reduction method and gas test method. There are usually direct pressure air tightness detection, differential pressure air tightness detection and other detection methods, according to different product needs to choose the detection method, the power battery liquid cooling plate air tightness test is usually carried out by direct pressure detection.This method needs to inject gas with specific pressure into the liquid cooling plate parts according to the detection requirements, observe the size of the internal pressure change of the workpiece through the pressure holding, and then judge whether there is leakage of the liquid cooling plate workpiece. Observe the pressure holding condition, if the pressure holding capacity exceeds the standard, the air tightness performance of the liquid cooling plate is better.2. Soaking methodSoaking method is also known as water inspection, the liquid cooling plate to be tested is immersed in water, and then observe whether there are bubbles, if there are bubbles, indicating that the liquid cooling plate has loopholes, does not meet the detection standards.3. Hydrogen leak detection methodBefore the test, prepare a water container, pressurize the water in the container, so that the difference between the water pressure before and after the container is between 5 and 10MPa, and then place the outlet of the liquid cooling plate under the water surface of the pressurized container, such as the leakage of the liquid cooling plate, then the hydrogen at the outlet will be absorbed by the water, and the hydrogen in the water will be tested by the detection instrument. We can locate the leakage point of the liquid cooling plate.4. Thermal cycling methodThis method is to first put the liquid cooling plate in a low temperature environment, and then quickly heated to a high temperature environment, to observe whether the liquid cooling plate has deformation or loopholes, if there is, it indicates that the liquid cooling plate air tightness is not good.Test requirements of liquid cooling platesTest pressure: 200kpa-250kpa Standard: < 50pa, IP67 Air tightness test introductionThe air tightness test is a test method to verify the air tightness of the container, also known as the tightness test or waterproof test. It is a compact test using gas as the pressurizing medium in order to prevent the leakage of the pressure vessel. The air tightness test must be qualified in the hydraulic test before it can be carried out, and the test method will be different according to the different device. In the process of selection and preparation for detection, it is also necessary to master some principles, such as the liquid in the device to form a closed environment, so that the temperature can be changed, and the strength of the pressure can also be changed, and the air tightness can be effectively judged through this change.

CNC machining (Computer numerical control machining) is a method of machining using computer-controlled CNC machine tools, which is widely used in parts manufacturing in various industries. It realizes the machining of the workpiece by controlling the machine tool to cut along the specified path through the pre-written machining program. The following will introduce the process flow of CNC machining.First, design and develop the processing technologyBefore CNC machining, it is first necessary to design the product and develop the processing technology. According to the requirements and functions of the product, the designer uses CAD (computer aided design) software to design the product. Then, the process engineer develops the processing technology according to the shape, material and processing requirements of the product, including the selection of the appropriate cutting tools, cutting parameters, cutting paths, etc.Secondly, write the processing programMachining program is the core of CNC machining, it contains the machine tool action instructions, cutting parameters, cutting path and other information. Writing the machining program requires the use of CAM (Computer aided manufacturing) software to convert the design file of the product into the machining program. When writing the processing program, it is necessary to consider the cutting performance of the material, the rationality of the process and other factors to ensure the efficiency and quality of the processing process.Then, the machine tool and tool clamping are carried outBefore CNC machining, the workpiece needs to be clamped on the machine tool and the appropriate tool is selected for cutting. Machine tool clamping is the process of fixing the workpiece to the machine tool, which needs to consider the shape, size and processing requirements of the workpiece. Tool clamping is the process of installing the tool on the machine tool, and it is necessary to select the appropriate tool type and specification, as well as the correct installation method. The accuracy and stability of machine tool and tool clamping has an important impact on machining accuracy and efficiency, so it needs to be carefully adjusted and checked.Next, the processing operation is carried outAfter the machine tool clamping and tool clamping are completed, the CNC machining operation can begin. The operator inputs the written machining program into the CNC machine tool controller, and then through the controller's instructions, the machine tool cuts in accordance with the path and speed specified by the program. During the machining process, the operator needs to monitor the machining status and adjust the cutting parameters and tools in time to ensure the machining quality and efficiency.Finally, the processing inspection and finishing are carried outAfter the completion of CNC machining, the workpiece needs to be inspected and trimmed. Measurement tools and equipment can be used to test the size, shape and surface roughness to verify that the workpiece meets the requirements. Finishing is the process of dressing, grinding or polishing the workpiece to eliminate possible processing defects and improve the accuracy and surface quality of the workpiece.In summary, the CNC machining process covers the design and development of machining technology, writing machining procedures, machine tool clamping and tool clamping, processing operation, and processing inspection and dressing. Each link requires accurate operation and strict control to ensure the efficiency of the processing process and the quality of the workpiece.The development of CNC machining has provided high-precision and high-efficiency parts manufacturing solutions for various industries. Compared with traditional manual operation and conventional machining, CNC machining has the following advantages:1, high precisionCNC machining through the precise control of CNC machine tools and high-speed rotation of tools, high-precision parts can be machined. Processing accuracy can reach sub-millimeter or even higher levels to meet the requirements of complex parts.2. High efficiencyCNC machining adopts computer programming and automatic control, which can realize automatic continuous processing and greatly improve production efficiency. The time and workload of manual operation are reduced, and production efficiency and capacity are improved.3. FlexibilityCNC machining can be flexibly processed according to different product requirements and design requirements. Just modify the processing program and adjust the tool, you can realize the processing of different parts, avoiding the trouble of replacing equipment in traditional machining.4. RepeatabilityCNC machining by writing processing programs and automatic control, can achieve accurate cutting path and processing parameters, to ensure the consistency and repeatability of processing. It is not affected by the technical level and experience of the operator, reducing the influence of human factors on the processing quality.5. VersatilityCNC machining enables a variety of machining operations, such as milling, turning, drilling, tapping, etc. A CNC machine tool can complete a variety of processing tasks, reducing equipment investment and floor space.In summary, CNC machining provides a part manufacturing solution with high efficiency, high precision, flexibility, repeatability and versatility. It is widely used in various industries, such as aerospace, automotive, electronics, medical equipment, mold manufacturing and so on.In the aerospace field, CNC machining can manufacture complex shaped aerospace parts, such as turbine blades, engine parts, aerospace structural parts, etc. Due to the high precision and repeatability of CNC machining, the quality and performance requirements of parts can be ensured.In the automotive industry, CNC machining can manufacture automotive engine parts, chassis parts, body parts, etc. Through CNC machining, high precision and consistency of parts can be achieved, improving the performance and safety of vehicles.In the field of electronics, CNC machining can manufacture electronic parts, circuit boards, shells, etc. Due to the high efficiency and flexibility of CNC machining, it can meet the rapid development and production needs of electronic products.In the field of medical equipment, CNC machining can manufacture medical device parts, artificial joints, dental equipment, etc. The high precision and repeatability of CNC machining can ensure the quality and safety of medical equipment.In the field of mold manufacturing, CNC machining can manufacture various types of molds, such as injection molds, die casting molds, stamping molds, etc. Due to the versatility of CNC machining, high-precision machining of complex molds can be achieved.Overall, the development of CNC machining provides high efficiency, high precision and flexible parts manufacturing solutions for various industries. It can control the machine tool through the computer program for automatic processing, which greatly improves the production efficiency and product quality.One of the advantages of CNC machining is high precision. Thanks to the use of computer program control, very precise machining can be achieved to achieve micron level accuracy requirements. This is very important for some parts that require a precise fit, such as gears, threads, etc.Secondly, CNC machining has a high degree of flexibility. By changing different tools and adjusting the processing path, a variety of complex shapes of parts can be manufactured. Moreover, the production of different products can be achieved only by modifying the program, without the need to redesign and manufacture new tooling.CNC machining is also repeatable. Once the correct machining procedures and parameters are set, the machine can operate continuously and maintain consistent machining quality without manual intervention. This is important for high volume production to ensure that each part meets the specified size and quality requirements.In addition, CNC machining is versatile. By choosing different tools and processing methods, drilling, milling, cutting, turning and other processing operations can be achieved to meet the processing needs of different parts. This makes CNC machining a versatile manufacturing process.Overall, CNC machining is an efficient, precise, flexible and reliable part manufacturing solution. With the continuous development of technology, CNC machining will play an increasingly important role in various industries, promoting the progress and development of manufacturing.

As long as there is a current flowing through an electronic device, the energy loss will be manifested as heat, and the greater the loss, the more heat will be generated. In semiconductor devices, the gate has been reduced to the size of nanometers, and a single bare chip can now contain millions of gates formed by billions of transistors, which is a test for heat dissipation.The effect of overheating on semiconductorsSemiconductor materials change with temperature due to the electromigration effect, and the performance of the device will be reduced beyond the temperature limit of the device. In addition, semiconductors rely on bonding connections, and if exposed to high temperatures, the integrity of the bond can be compromised. Semiconductor devices are usually composed of chips on an insulated substrate, and overheating will cause different levels of deformation in the semiconductor devices, reducing the service life; Or due to the expansion of the packaging material and stress on the chip, resulting in premature failure of the device, which adversely affects reliability, so the higher the operating temperature, the lower the reliability.Cooling solutionThe typical PCB heat dissipation method is passive cooling, where a low thermal resistance copper sheet placed under and around the semiconductor takes away the heat of the device and distributes it to other parts of the PCB board if the space and components allow.Another way to dissipate heat from semiconductors is to install radiators, which are generally made of aluminum and covered with fins on the substrate to maximize the surface area, and then rely on air convection to dissipate heat. Compared to the first method, the heat can be dissipated from the device more efficiently.If the radiator is unable to dissipate excess heat, a fan can be installed to force heat dissipation. The advantage is increased air convection to speed up heat transfer, the disadvantage is that this arrangement will suck dust and pollutants into the equipment, which may affect the overall reliability or potentially reduce the thermal efficiency of the radiator.If space is limited, another solution is heat pipe cooling. As an off-the-shelf material, heat pipes provide a reliable and cost-effective way to passively transfer heat from hot spots on the plate to cooler locations. Typically, heat pipes contain a small amount of endothermic liquid, such as pressurized nitrogen, ammonia, or acetone. The fluid absorbs heat and turns into vapor, which flows down the pipe to the condenser, where it condenses back into a liquid state and then returns to the heat source for re-circulation. Heat pipes have the advantage of passive construction, no moving parts, and no maintenance requirements.Other solutions include using liquid-cooled cooling plates or Peltier effect cooling plates, but add cost and design complexity.PCB heat dissipation recommendations1. Provide natural ventilation for the circuit board, so that the air freely flows through the surface of the circuit board, which can minimize the uneven cooling.2. If the PCB is installed in the housing, try to choose the housing made of low thermal resistance materials; Fins, ridges, or simple raised designs can be used to maximize the surface area of the shell. If the enclosure of the device allows, the direction of the PCB can be adjusted vertically, using the principle of hot air rising and cold air sinking to increase the airflow rate of natural convection.3. If a fan is installed, place the fan at one end of any natural convection channel to ensure free air flow; In addition, if the device is running in an area with dust or contaminants, install a filter.