CN-121989657-A - Vehicle underbody structure

CN121989657ACN 121989657 ACN121989657 ACN 121989657ACN-121989657-A

Abstract

A vehicle underbody structure includes a battery case mounted in a lower portion of a vehicle, at least a portion of an upper wall of the battery case also functioning as a floor panel, a battery module housed within the battery case, and a detector housed within the battery case and configured to detect a voltage abnormality of the battery module. An opening configured to allow access to the detector is provided in the upper wall of the battery case, and a cover configured to open and close the opening is provided.

Inventors

Tobihara Katsushige

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20251030
Priority Date: 20241105

Claims (4)

1. A vehicle underbody structure comprising: a battery case mounted in a lower portion of the vehicle, at least a portion of an upper wall of the battery case also serving as a floor panel; A battery module accommodated in the battery case, and A detector housed in the battery case, the detector configured to detect a voltage abnormality of the battery module, Wherein an opening configured to allow access to the detector is provided in the upper wall of the battery case, and a cover configured to open and close the opening is provided.
2. The vehicle underbody structure according to claim 1, wherein the opening is provided in the upper wall of the battery case, the opening being provided at a position between a dash panel that constitutes a front wall of a vehicle compartment and an accelerator pedal, when viewed from a side in a vehicle width direction.
3. The vehicle underbody structure according to claim 2, wherein: the opening being arranged such that a longitudinal direction of the opening extends in the vehicle width direction, and An upper surface of a front cross member extending between a pair of left and right rocker beams at a position below the dash panel in the vehicle up-down direction is substantially flush with an upper surface of the upper wall of the battery case.
4. The vehicle underbody structure according to any one of claims 1 to 3, wherein: The opening being arranged such that a longitudinal direction of the opening extends in a vehicle width direction, and A lateral portion extending in the vehicle width direction is provided in a portion of the interior of the battery case, the portion being positioned closer to the lower wall of the battery case and facing the opening in the vehicle up-down direction.

Description

Vehicle underbody structure Technical Field The present invention relates to a vehicle underbody structure. Background Pure electric vehicles provided with a battery case including a case rear portion having an opening and a case front portion removably closing the opening are conventionally known in the art (see, for example, japanese unexamined patent application publication No. 10-255746 (JP 10-255746A)). Disclosure of Invention In order to maintain or replace a detector configured to detect a voltage abnormality of a battery module housed in a battery case, the battery case needs to be removed from the pure electric vehicle and disassembled. However, in a configuration in which the battery case is mounted at the lower portion of the vehicle, it is not easy to remove the battery case from the vehicle. It is therefore an object of the present invention to provide a vehicle underbody structure that enables a detector configured to detect a voltage abnormality of a battery module housed in a battery case to be maintained or replaced without removing the battery case from the vehicle. In order to achieve the above object, a vehicle underbody structure of a first aspect of the present invention includes a battery case mounted in a lower portion of a vehicle, at least a portion of an upper wall of the battery case also functioning as a floor panel, a battery module housed in the battery case, and a detector housed in the battery case and configured to detect a voltage abnormality of the battery module. An opening configured to allow access to the detector is provided in an upper wall of the battery case, and a cover configured to open and close the opening is provided. In the first aspect of the invention, the battery case is mounted in the lower portion of the vehicle, and at least a portion of the upper wall of the battery case also serves as the floor panel. The battery module and a detector configured to detect a voltage abnormality of the battery module are housed within the battery case. An opening configured to allow access to the detector is provided in an upper wall of the battery case, and a cover configured to open and close the opening is provided. With the above configuration, the detector can be accessed through the opening by removing the cover. Therefore, maintenance or replacement of the detector can be performed without removing the battery case from the vehicle. According to the vehicle underbody structure of the second aspect of the invention, in the vehicle underbody structure of the first aspect, the opening is provided in the upper wall of the battery case, the opening being provided at a position between the dash panel and the accelerator pedal that constitute the front wall of the vehicle compartment, when viewed from the side in the vehicle width direction. In a second aspect of the invention, an opening is provided in the upper wall of the battery case, the opening being provided at a position between the dash panel that constitutes the front wall of the vehicle compartment and the accelerator pedal, when viewed from the side in the vehicle width direction. In other words, the opening is formed at a position that is not easily accessible to the occupant. This configuration reduces the risk that an occupant may inadvertently remove the cover from the cabin interior, thereby ensuring safety. According to the vehicle underbody structure of the third aspect of the invention, in the vehicle underbody structure of the second aspect, the opening is provided such that the longitudinal direction of the opening extends in the vehicle width direction, and the upper surface of the front cross member extending between the pair of left and right rocker beams at a position below the dash panel in the vehicle up-down direction is substantially flush with the upper surface of the upper wall of the battery case. In a third aspect of the invention, the opening is provided such that the longitudinal direction thereof extends in the vehicle width direction, and the upper surface of the front cross member that extends between the left and right rocker beams at a position below the dash panel in the vehicle up-down direction is substantially flush with the upper surface of the upper wall of the battery case. This configuration makes it possible to maximally achieve suppression of an increase in weight of the vehicle and reinforcement in the vicinity of the opening of the battery case, as compared with the case where the upper surface of the front cross member is not substantially flush with the upper surface of the upper wall of the battery case. As used in this disclosure, the term "flush" also includes "substantially flush," which includes minor deviations. According to a vehicle underbody structure of a fourth aspect of the invention, in the vehicle underbody structure of any one of the first to third aspects, the opening is provided such that a longitudinal direction of the opening extends in a vehicle