CN-121989696-A - Vehicle underbody structure

Abstract

A vehicle bottom structure is provided with a battery pack mounted on the bottom of a vehicle, and a protection plate disposed below the battery pack. The vehicle bottom structure further includes an impact protection member made of a shear thickening material disposed between the lower surface of the battery pack and the protection plate. The impact protection member formed of a shear thickening material is disposed only between the lower surface of the battery pack and the protection plate.

Inventors

• SEKI TOSHIYA
• YOKOTANI NAOYUKI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20250820

Priority Date

20241106

Claims (5)

1. 1. A vehicle underbody structure is provided with: the battery pack is carried at the bottom of the vehicle; a protection plate disposed at the lower side of the battery pack, and An impact protection member disposed only between the lower surface of the battery pack and the protection plate and formed of a shear thickening material.
2. 2. The vehicle underbody construction according to claim 1, wherein, The protection plate is made of fiber reinforced plastic.
3. 3. The vehicle under-construction according to claim 1 or 2, wherein, The protection plate is provided with a protection plate body, The impact protection member is buried between the protection plate body and the lower surface of the battery pack without a gap.
4. 4. The vehicle under-construction according to claim 1 or 2, wherein, The battery pack includes a lower case having a bottom plate portion, The bottom plate portion has a projection portion partially projecting upward, The impact protection member is partially provided corresponding to a portion of the bottom plate portion where the protruding portion is located.
5. 5. The vehicle under-construction according to claim 1 or 2, wherein, The impact protection member is integrated with the battery pack or the protection plate.

Description

Vehicle underbody structure The present application claims priority from japanese patent application No. 2024-194640 filed on 11/6 of 2024. The disclosure of the above application, including the specification, drawings and claims, is incorporated by reference in its entirety. Technical Field The present disclosure relates to vehicle underbody construction. Background In the vehicle underbody configuration disclosed in international publication 2012/081173, the case of the battery pack has a double configuration. The inner layer of the housing is formed of metal or resin and the outer layer of the housing is formed of a shear thickening material. The components formed of the shear thickening material protect the battery pack. Disclosure of Invention An object of the present disclosure is to suppress an increase in cost in a vehicle bottom structure provided with a member formed of a shear thickening material that protects a battery pack. The vehicle underbody structure according to claim 1 includes a battery pack mounted on a vehicle underbody, a fender disposed on a lower side of the battery pack, and an impact protection member disposed only between a lower surface of the battery pack and the fender and made of a shear thickening material. In this embodiment, the vehicle bottom structure includes a battery pack mounted on the vehicle bottom, and a protection plate disposed below the battery pack. Therefore, the battery pack can be protected from the spills, deceleration strips, under-the-road (bottom-out roads) and the like on the road by the protection plate. However, in order to properly protect the battery pack, weight increase, cost increase, and the like become problems with respect to the protection plate. In order to properly absorb the impact energy, a gap (impact absorbing stroke) in the up-down direction needs to be provided between the battery pack and the protection plate. Therefore, in the present embodiment, the vehicle bottom structure further includes an impact protection member made of a shear thickening material, which is disposed between the lower surface of the battery pack and the protection plate. Therefore, the impact protection member formed of the shear thickening material functions in such a manner as to protect the battery pack from the impact from the bottom. In particular, since the shear thickening material has a property of hardening against a large input, a small shock absorbing stroke is also possible. As a result, the occurrence of the above-described problems and the like relating to the shield plate can be suppressed. Further, in this embodiment, the impact protection member formed of the shear thickening material is disposed only between the lower surface of the battery pack and the protection plate. That is, the battery pack is not disposed on the upper surface side or the side surface side of the battery pack, which is less likely to contact with the scattered objects or the like. Therefore, an increase in cost due to the provision of the impact protection member formed of the shear thickening material can be suppressed. The vehicle underbody structure according to claim 2 is the vehicle underbody structure according to claim 1, wherein the shielding plate is made of fiber-reinforced plastic. In this solution, the protection plate is made of fiber reinforced plastic. Therefore, the weight reduction of the structure is easier than the case where the shield plate is made of iron. The fiber reinforced plastic shield plate has a strong function of preventing penetration of a sharp foreign matter, but is difficult to absorb impact. But enables the impact protection member formed of the shear thickening material to afford absorption of the impact. In the embodiment described later, the shield plate includes the shield plate body and the reinforcing member, both of which are made of fiber reinforced plastic, but the shield plate of the present embodiment is not limited thereto. Regarding the protection plate of the scheme, at least the protection plate body is made of fiber reinforced plastic. In addition, the protection plate of the scheme can be formed by the protection plate body only. The vehicle bottom structure according to claim 3 is the vehicle bottom structure according to claim 1 or 2, wherein the protection plate includes a protection plate body, and the impact protection member is buried between the protection plate body and the lower surface of the battery pack without a gap. In this scheme, the guard plate possesses the guard plate body. And, the impact protection member is buried between the protection plate body and the lower surface of the battery pack without a gap. Therefore, the battery pack can be more effectively protected. In addition, compared with the case where the above-described gap is provided, miniaturization of the structure in the vehicle up-down direction can be achieved. The vehicle bottom structure according to claim 4 is the vehicle bottom