| EQUIVALENT STIFFNESS MODELING METHOD OF A BATTERY
SYSTEM FOR EVALUATING VEHICLE REAR-END COLLISION
PERFORMANCE |
| Jaejun Lee 1, Heung-Kyu Kim 2, Seung-Jin Heo 2, Sang-Jin Lee 3 |
1Graduate School of Automotive Engineering, Kookmin University
2Department of Automotive Engineering, Kookmin University
3Hyundai Motor Company |
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| ABSTRACT |
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The battery system of a vehicle is critical for its good operation, and in the event of vehicle collision, damage
to the parts or displacement of the battery can significantly affect performance. Nonlinear characteristics must be considered
when designing elastic parts for vehicle’s collision analysis, and nonlinear dynamic finite element analysis simulations should
be used to derive dynamic responses through collision simulations. Existing models examine the overall behavior without
specifically configuring each part, and therefore, we need a model that can derive dynamic responses through collision
simulations at the part level. Thus, we propose an equivalent stiffness model for a battery system to evaluate the vehicle’s
rear-end collision performance in the early design stage. The model showed errors of 7.54 % and 6.12 % in the peak-to-peak
values for the x-axis and z-axis acceleration responses, respectively, on the upper part of the battery; the root mean square
value was within the margin of error. Simulation results confirmed that the proposed model is as accurate as the real vehicle
test and nonlinear dynamic finite element analysis model. Thus, it can be used in the early design stage to predict system
performance for collision test in a system whose geometry has not been determined. |
| Key Words:
Equivalent stiffness model, Battery system, Kelvin model, Force elements, Vehicle’s rear-end collision,
Hybrid test track (HTT) |
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Corresponding Author.
Heung-Kyu Kim , Email. 
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