The power battery is the power source that provides the power source for the tool, and usually refers to the battery that provides power for electric cars, electric trains, electric bicycles, and golf carts. As the main power battery, power batteries are widely used in all aspects of industry and life. Recently, with the hot production and sales of new energy vehicles, China has become the world's largest market. For a while, the development of the upstream and downstream industrial chain of power batteries has attracted wide media attention.

　　The power battery is the power source that provides the power source for the tool. It refers to the battery that provides power for electric cars, electric trains, electric bicycles, and golf carts. As the main power battery, power batteries are widely used in all aspects of industry and life. Recently, with the hot production and sales of new energy vehicles, China has become the world's largest market. For a while, the development of the upstream and downstream industrial chain of power batteries has attracted wide media attention.

　　Power battery is the core component of new energy vehicles, which directly determines the performance of the whole vehicle. Its production process can be divided into front-end, mid-end and back-end equipment. The accuracy and automation level of the equipment will directly affect the efficiency and consistency of the battery. The total demand for power lithium batteries in 2020 will reach 37GWh, more than ten times that of 2014. The expansion of power batteries will directly drive equipment demand. As a midstream equipment linking upstream raw materials and downstream products, the laser welding process has begun to enter people's field of vision, but the mystery of its process application is still covered by a mystery. Benefiting from being in the laser industry, the author today touched the pulse of the industry's development to quasi-six major acupuncture points, took the opportunity to lift the veil, and revealed the application of laser welding in the power battery industry.

　　Acupoint 1: Fully Fusion

　　In short for power battery manufacturers, laser welding is a fusion manufacturing process that combines raw materials such as positive and negative electrode materials, separators and electrolytes into one piece. It is a key process in the entire power battery production process. Weld all raw materials into battery cells and PACK modules, which can be directly used in traditional consumer electronics, electronic tools, electric bicycles, energy storage power stations and new energy vehicles.

　　On the other hand, the status of laser welding in power batteries can also be reflected in the cost value of welding equipment. Taking battery raw materials as a comparison, the cost of raw materials is continuous and purchased in units of tons; laser welding equipment is basically in place at one time, and the value of welding equipment of different processes or types ranges from hundreds of thousands to hundreds Ten thousand yuan, accounting for 5-15% of the battery factory investment, and the battery pack factory investment accounting for 10-40%.

　　Point 2: Full contrast 　　 The battery manufacturing process involves a wide range of welding techniques, such as ultrasonic welding, resistance welding and laser welding. The reasonable selection of welding methods and processes directly affects the production cost, the reliability of the quality and the safety of use of the battery. As a very important process in battery production, laser welding has a great impact on the consistency, stability and safety of the battery. There are many laser welding parts for power batteries, the process is difficult, and the welding process is more demanding. High-efficiency and precise laser welding can greatly improve the safety, reliability and service life of automotive power batteries, which will surely provide an important guarantee for the development of automotive power technology in the future.

　　In contrast, it is found that the advantages of laser welding are that the loss of welding material is small, the deformation of the welded workpiece is small, the performance of the equipment is stable and easy to operate, the welding quality and the degree of automation are high. Its technological advantage is unmatched by other welding methods.

　　Point 3: The cell of the full process power battery can be divided into different types according to its appearance, such as square, cylinder, soft pack, 18650, etc. Among all shapes of batteries, the most comprehensive laser welding process is the welding of cylindrical batteries. Here, the cylindrical battery is used. Take the power battery process flow as an example, the process application of laser welding is shown in the figure below:

　　After the above-mentioned laser welding process, continue to assemble multiple single cells to form PACK battery packs used in electric bicycles and electric vehicles. For example, the international leader Tesla used more than 7000 Panasonic NCR186503100mah batteries to synthesize PACK battery pack to meet high endurance.

　　Point 4: more efficient

　　Although the laser equipment used in the power battery on the market looks like "squandering and fascinating", it ultimately achieves the same goal by different paths. Based on the complexity of the process and the space occupied by the equipment, laser welding equipment can basically be divided into three types: pilot equipment, fully automated workstations and fully automated assembly lines.

　　The pilot plant is basically a stand-alone semi-automatic operation table, which is used in the testing of initial pilot products and small batch production.

　　Fully automatic workstations, mostly in the mode of double swords combined, laser host plus semi-enclosed or fully enclosed workbenches, each workbench is generally equipped with multi-station fixture tooling, suitable for power battery laser welding and battery pack welding Fully automatic system of single process section of various processes.

　　Fully automatic production line, an upgraded version of the automatic workstation, connects multiple workstations to form a complete intelligent automatic production line for battery cell welding or battery pack welding.

　　Point 5: Safer

　　In recent years, with the rapid development of electric vehicles, how to solve the safety problems of electric vehicles is the key point and difficulty that must be broken through for the sound development of the new energy vehicle industry. Because people have a process of cognition of new things, it is inevitable that they have an attitude of suspicion and distrust at the beginning. Therefore, any safety accident related to electric vehicles will cause the public to further deepen their doubts about the safety of electric vehicles and hinder the development of electric vehicles. Development and popularization.