Application of high vacuum heat treatment brazing electric furnace battery industry
10-15-2025 Author: KJ technology
The application of high vacuum heat treatment brazing electric furnaces in the battery industry is mainly reflected in the vacuum brazing of battery pack shells and motor stators, as well as the optimization of battery component connection processes. Its core value lies in improving sealing, thermal conductivity efficiency, and battery life. The following are specific application scenarios and advantages analysis:
1. Vacuum brazing of battery pack shell
Improved sealing performance
The vacuum environment can avoid the generation of oxides during the brazing process, ensure that there are no defects at the joints of the shell, prevent electrolyte leakage or external moisture intrusion, and improve battery safety. For example, the adoption of vacuum brazing in electric vehicle battery packs significantly improves the compliance rate of IP67 waterproof rating.
Optimization of thermal conductivity efficiency
The brazing material is uniformly filled under vacuum to reduce thermal resistance and improve the heat dissipation performance of the battery pack. Experimental data shows that the thermal conductivity of vacuum brazed battery packs is improved compared to traditional methods, which helps to extend the battery life in high-temperature environments.
Lightweight support
Vacuum brazing is suitable for connecting lightweight alloys such as aluminum and magnesium, meeting the weight reduction requirements of battery packs. For example, a new energy vehicle company uses vacuum brazing technology to reduce the weight of battery packs while maintaining structural strength.
2. Vacuum brazing of motor stator
Improvement of conductivity performance
Vacuum environment eliminates the risk of hydrogen embrittlement during brazing process and reduces contact resistance. Tests have shown that the conductivity efficiency of vacuum brazed motor stator is improved compared to traditional methods, reducing energy loss.
Enhanced corrosion resistance
The non oxidizing welding layer can resist electrolyte corrosion and extend the service life of the motor. In the salt spray test, the corrosion resistance time of vacuum brazed stator is longer than that of ordinary methods.
High precision connection
Vacuum brazing can achieve micrometer level gap control, ensuring a tight bond between the stator winding and the iron core, and reducing vibration noise. Data from a certain aviation motor project shows that the vibration amplitude of vacuum brazed stator is reduced, and the operational stability is significantly improved.
3. Optimization of battery component connection process
Heterogeneous material connection
The vacuum brazing furnace supports direct connection of dissimilar materials such as aluminum copper and aluminum steel, without the need for intermediate layers, simplifying the production process. For example, the aluminum copper connection of lithium-ion battery current collectors and the tensile strength improvement of vacuum brazed joints.
Welding of small components
A vacuum environment can achieve precise connection of small electronic components in battery management systems (BMS), avoiding poor contact caused by oxidation. After a semiconductor company adopted vacuum brazing, the BMS failure rate decreased.
No flux process
Vacuum brazing eliminates the use of flux, reduces the risk of internal contamination in batteries, and lowers the cost of cleaning processes. According to statistics, vacuum brazing technology can shorten the production cycle of batteries.
4. Typical application cases
New energy vehicle battery
The Tesla Model 3 battery pack adopts vacuum brazing technology to achieve reliable connection between the aluminum shell and the cooling pipe, improve heat dissipation efficiency, and support the implementation of fast charging technology.
Energy Storage System
The solar energy storage battery module is connected by vacuum brazing, which has a longer cycle life and is higher than traditional methods, meeting the energy storage needs of the power grid.
Consumer electronics battery
The Apple iPhone battery is fixed by vacuum brazing, reducing thickness and increasing energy density, supporting the lightweight design of the device.
