The seismic structure design of lithium battery packs mainly focuses on enhancing structural strength, optimizing buffering and energy absorption, and ensuring stable connections. The following is a specific principle analysis:

1. Shell structure reinforcement

Application of high-strength materials: The shell is made of high-strength materials such as aluminum alloy and stainless steel, and the overall seismic resistance is enhanced through the mechanical properties of the materials themselves. This type of material can effectively resist external impacts and reduce the damage to internal components caused by vibration transmission.

Modular fixed design: Through structures such as slotted upper seat plates and lower seat plates, individual batteries are independently fixed at specific positions. For instance, the slotted structure can prevent individual cells from shifting or being squeezed during vibration, thus avoiding the risk of short circuits caused by the friction of internal electrode plates.

2. Internal buffering and support

Shock-absorbing material filling: Elastic materials such as rubber pads and springs are filled between the battery and the casing to absorb impact energy through deformation. For example, rubber pads can buffer vertical vibrations, while springs are suitable for multi-directional vibration scenarios.

Elastic diaphragm and buffer layer: A laminated electrode design is adopted in combination with elastic diaphragm material, and the vibration energy is dispersed through the buffer layer. The application of gel-state electrolyte can reduce the risk of leakage under extreme vibration while maintaining the stability of ion transport.

3. Optimization of connection structure

Flexible connection design: Use components such as elastic washers and T-shaped compression seats to ensure that the conductive contacts maintain close contact with the series metal sheets during vibration. For instance, the compression bolts in combination with elastic washers can compensate for the displacement caused by vibration and prevent performance degradation resulting from poor contact.

Anti-loosening and fixing mechanism: The welding column and the terminal post are fixed through structures such as threaded cylinders and rubber cylinders to prevent the welding points from falling off due to vibration. For example, rotating the threaded cylinder causes the rubber cylinder to press down on the welded column, which not only achieves fixation but also provides shock absorption protection.

4. Optimization of structural layout

Seismic frame integration: Some industrial-grade products are equipped with metal shell seismic frames, which disperse the impact force through the rigid support of the frame. For instance, the frame structure can enhance the stability of the battery pack under high-frequency vibration, making it suitable for high-vibration environments such as vehicle-mounted vehicles.

Reserved space for shock absorption: Reserve the deformation space of elastic materials inside the battery pack to prevent structural interference during vibration. For example, the thickness of the rubber pad needs to be designed according to the expected vibration amplitude to ensure that it is fully compressed without failure.

5. Dynamic performance verification

Simulation test verification: Through equipment such as vibration tables and impact testing machines, the vibration conditions in the actual usage environment are simulated. For example, the vehicle-mounted battery needs to meet the continuous vibration test within the frequency range of 5-15Hz in the ISO 6469-1 standard to ensure the design reliability.

Long-term performance monitoring: Continuously monitor the seismic performance of battery packs in practical applications and evaluate their stability under complex working conditions. For instance, the durability of the seismic design of battery packs in energy storage power stations needs to be verified through long-term operation data.