Method and system for evaluating collision testing of bottom of battery pack and device

A method for evaluating collision testing of a bottom of a battery pack, comprising:

• obtaining material parameters and size parameters of each component at a bottom of a battery pack to be tested, and constructing a three-dimensional battery pack collision simulation model according to the material parameters and the size parameters;
• setting a benchmarking working condition, and performing collision testing on the battery pack to be tested based on the benchmarking working condition to obtain a measured collision posture;
• wherein working condition data in the benchmarking working condition comprises:
• material parameters and size parameters of the battery pack to be tested, parameters of a trolley loaded with the battery pack to be tested, collision obstacle parameters, and a collision speed and a collision height of the trolley loaded with the battery pack to be tested;
• and the measured collision posture comprises a posture of front wheel jumping and a posture of rear wheel jumping when the trolley loaded with the battery pack to be tested collides with a collision obstacle;
• calibrating the three-dimensional battery pack collision simulation model based on the measured collision posture to obtain an optimized three-dimensional battery pack collision simulation model;
• wherein, the calibrating the three-dimensional battery pack collision simulation model based on the measured collision posture to obtain an optimized three-dimensional battery pack collision simulation model specifically comprises:
• calculating a displacement of a front wheel in a Z direction and a displacement of a rear wheel in the Z direction based on the measured collision posture;
• calculating a collision displacement difference according to the displacement of the front wheel in the Z direction and the displacement of the rear wheel in the Z direction;
• and constraining, when the collision displacement difference is within a preset threshold range, a Z-direction degree of freedom of the front wheel of the trolley loaded with the battery pack to be tested in the three-dimensional battery pack collision simulation model, wherein the three-dimensional battery pack collision simulation model after the constraint of the Z-direction degree of freedom of the front wheel is the optimized three-dimensional battery pack collision simulation model;
• setting a plurality of standby working conditions, performing collision simulation under any standby working condition by using the optimized three-dimensional battery pack collision simulation model, and recording a simulation result, wherein the simulation result comprises a deformation parameter of the battery pack and a stress state parameter at a collision point of the battery pack;
• and
• determining collision safety performance of the battery pack to be tested based on simulation results corresponding to different standby working conditions.