Power batteries are actually a type of energy storage battery, mainly used in electric vehicles. Due to the volume and weight limitations of vehicles as well as the requirements for starting acceleration, power batteries have higher performance requirements than ordinary energy storage batteries, such as as high energy density as possible, fast charging speed, and large discharge current. However, the requirements for ordinary energy storage batteries are not so high. According to the standards, When the capacity of a power battery drops below 80%, it can no longer be used in new energy vehicles. However, with a little modification, it can still be used in energy storage systems. Therefore, lithium battery laser welding equipment can be fully applied to the welding of energy storage batteries.
The differences between power batteries and energy storage batteries:
There are some differences between power lithium batteries and energy storage lithium batteries, but in terms of battery cells, they are the same. Both can use lithium iron phosphate batteries and ternary lithium batteries. The main difference lies in the BMS battery management system. The power response speed and power characteristics of the battery, the accuracy of SOC estimation, and the charging and discharging characteristics can all be achieved on the BMS.
Advantages of laser welding in energy storage batteries:
1. The welding process is non-contact welding, and the internal stress of the welding ribs is reduced to the minimum during the welding process.
2. The welding process does not produce any other overflow materials or released substances, preventing secondary pollution.
3. The welding strength and air tightness are high, which can meet the functional requirements.
4. Laser welding can meet the welding requirements between different substances, and it can also be used to connect film-like materials and dissimilar substances.
5. Laser welding is convenient for automated integration and can also achieve synchronous laser welding process solutions based on production capacity requirements. It features high efficiency and low internal stress during welding.
6. The structures involved in laser welding are simple and convenient, reducing the difficulty coefficient of the mold structure.
7. The welding process can be digitally and intelligently monitored, meeting the need for data and visualization of the welding process.
8. This type of welding process solution can be effectively integrated with automated production lines, meeting the requirements of mass production plans, achieving efficient production and low consumption.
Battery laser welding technology features concentrated energy, high precision, high efficiency and firm welding. The laser beam is easy to focus, flexible and convenient. It can be redirected between the fixture and obstacles, and the welding energy can be precisely controlled, ensuring the welding quality and appearance. The entire welding process features low heat input, fewer heat-affected zones, and lower deformation and residual stress. Non-contact battery laser welding and optical fiber transmission are adopted, which offers better versatility and higher automation. Laser welding technology can achieve high-intensity welding of various materials, especially showing greater superiority in copper and aluminum.