battery shell material of EPS battery unit The battery housing...
How is the superalloy spring designed in the battery safety valve?
In the safety valve and pressure release device of the EPS battery cell, the design of the superalloy spring is crucial to ensure that its performance and elasticity are maintained in high temperature environments, thus effectively controlling the internal pressure of the battery. The following is a detailed introduction to the design of the superalloy spring in the battery safety valve.
main content
Structural design
The design of pressure relief device of lithium battery safety valve includes valve body, shape memory alloy sleeve, reset spring, end cap, pressure relief spring assembly and other key components. Wherein, the reset spring is fixed connected between the first sleeve and the end cover, and the shape memory alloy sleeve is fixed to make the end cover move up and down in the second sleeve to drive the shape memory alloy sleeve to move up and down to realize the gas path communication between the battery and the outside world.
Function realization
Under normal conditions of use, the superalloy spring (reset spring) provides preload to ensure the sealing performance of the safety valve. When the internal temperature of the battery rises to the shape memory alloy transition temperature, the shape memory alloy sleeve shrinks, the preload disappears, and the pressure of the end cap drives the shape memory alloy sleeve to move upward to achieve pressure relief.
Temperature response
In the design of the safety valve, the superalloy spring works in concert with the shape memory alloy sleeve. When the temperature is lower than the alloy transition temperature, a pre-tension force is generated between the shape memory alloy sleeve and the first sleeve to maintain the seal of the safety valve. When the temperature rises above the transition temperature, the shape memory alloy sleeve shrinks, the preload disappears, and the relief valve opens for pressure relief.
Pressure response
The superalloy spring also plays a role in responding to internal pressure changes in the safety valve. When the internal pressure of the battery exceeds the set threshold, the pressure of the end cap moves upward, driving the shape memory alloy sleeve to move upward, realizing the gas path communication between the battery and the outside world, and achieving the purpose of pressure relief.
Material property
The ability of superalloy springs to operate at 700 degrees without losing elasticity is essential for the performance of battery safety valves in extreme temperature conditions.
Safety performance
The design of the safety valve can effectively restrain or even terminate the thermal runaway process of the battery, and improve the safety of the battery.
CONCLUSION
In summary, the design of the superalloy spring in the battery safety valve and pressure release device involves cooperating with the shape memory alloy sleeve to achieve a dual response of temperature and pressure to ensure the safe operation of the battery under high temperature and high pressure conditions. This design not only improves the safety performance of the battery, but also provides a guarantee for the reliability and durability of the battery.
EPS BATTERY SERIES
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