In-vehicle battery pack

Abstract

An in-vehicle battery pack according to this invention is an in-vehicle battery pack comprising a bracket provided either on a front or rear side of the battery pack, wherein: the bracket comprises at least two mounting sections; a first mounting section is attached to a base reinforcement; a second mounting section is attached at a position below the first mounting section to a base bracket attached to a base plate; and the first mounting section and the second mounting section are arranged at different positions in the width direction of the bracket.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0001] This invention relates to an in-vehicle battery pack. 2. Description of the state of the art

[0002] Japanese patent application JP 2022 - 111 787 A discloses an in-vehicle battery pack with shock-absorbing parts. SUMMARY OF THE INVENTION

[0003] A technology has been developed that provides shock-absorbing parts to protect a battery pack when a vehicle is subjected to an impact. JP 2022 - 111 787 A discloses the battery pack, which uses frames with easily deformable sections for a tray that houses a battery, so that the shock-absorbing parts deform further downward than the battery area during a vehicle impact, thereby protecting the battery area.

[0004] On the other hand, if a floor panel yields under the load of a side collision (hereinafter referred to as a "side impact collision"), a base part of a center tunnel, where piping and cables are laid, tends to fall downward. In this case, the floor panel may come into contact with an upper surface of the battery pack.

[0005] This invention has been developed to solve this problem, and an object of the invention is to provide an in-vehicle battery pack that can prevent interaction between the floor panel and the battery when a side impact collision load is applied.

[0006] In an on-vehicle battery pack according to this invention, comprising a bracket provided on either a front or rear side of the battery pack, the bracket comprises at least two fastening sections, wherein a first fastening section is attached to a floor reinforcement, a second fastening section is fastened to a floor bracket attached to a floor plate at a position below the first fastening section, and the first fastening section and the second fastening section are arranged at different positions in the width direction of the bracket.

[0007] Thus, an in-vehicle battery pack can be provided that can prevent interaction between the floor panel and the battery when a side impact collision load is applied.

[0008] The first mounting section and the second mounting section can be arranged at the same distance from the center of gravity of the battery pack. This allows loads on the respective mounting sections to be balanced to prevent imbalance.

[0009] The second attachment portion may be arranged closer to an exhaust pipe than the first attachment portion. Thus, the second attachment portion may be arranged on a side where a distance from an exterior of the vehicle is ensured by the exhaust pipe.

[0010] This invention can provide an in-vehicle battery pack that can prevent interaction between the floor panel and the battery when a side impact collision load is applied during a side impact collision of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The features and advantages as well as the technical and economic significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which like reference numerals designate like elements, in which: Fig. 1A is a perspective view of an in-vehicle battery pack according to this invention; Fig. 1B is a perspective view of the in-vehicle battery pack according to this invention; Fig. 1C is a sectional view of the battery pack for vehicles according to this invention; Fig. 2 is a plan view, a sectional view, and a perspective view of the in-vehicle battery pack according to this invention; Fig. 3A is a perspective view of the in-vehicle battery pack according to this invention; Fig. 3B is a perspective view of the in-vehicle battery pack according to this invention; Fig. 3C is a sectional view of the in-vehicle battery pack according to this invention; and Fig. 4 is a plan view of the in-vehicle battery pack according to this invention. DETAILED DESCRIPTION OF EMBODIMENTS

[0012] An example of the configuration of an on-vehicle battery pack (hereinafter referred to as “battery pack”) according to this invention is described using Fig. 1A, Fig. 1B and Fig. 1C. A battery pack 10, which in the perspective view of Fig. 1A is a battery pack for vehicles (in-vehicle battery pack) designed to be installed under a vehicle floor and configured to include a bracket 20 and to be mounted to the vehicle via the bracket 20.

[0013] The bracket 20 includes a step and at least two fixing portions provided at different positions, one on each side of the step, in a width direction of the bracket 20 (corresponding to "RH" in the drawing). Here, the fixing portion located on the upper side in the perspective view (corresponding to "UPR" in the drawing) is referred to as the first fixing portion 21, and the fixing portion located on the lower side is referred to as the second fixing portion 22.

[0014] In this embodiment, the bracket 20 is described as a rear bracket provided on a rear side of the battery pack 10 (corresponding to the opposite direction of "Fr" in the drawing), but this invention is not limited thereto. The bracket 20 can also be suitably used as a front bracket provided on a front side of the battery pack 10 (corresponding to "Fr" in the drawing).

[0015] Fig. 1B is a view showing an example of the configuration of a floor reinforcement 23 and a floor bracket 24 attached to the bracket 20. Fig. Fig. 1C is a sectional view of a state in which the bracket 20 on one side and the floor reinforcement 23 and the floor bracket 24 on the other side are connected to each other by a floor plate 25, and shows a section along the long dashed line II-II shown in Fig. 1A is specified.

[0016] Next, the details of the bracket 20, the floor reinforcement 23 and the floor bracket 24 according to this invention are shown using the top, middle and bottom views in Fig. 2. In the view below in Fig. 2, the illustration of the battery pack 10 is omitted, wherein the battery pack 10 is attached to battery pack attachment points 11 on the bracket 20.

[0017] It is preferred that the floor bracket 24 is mounted on a side subject to a side impact collision load (the side indicated by the arrows in Fig. 2). The floor reinforcement 23 should preferably be mounted on the side opposite the floor bracket 24 to prevent deformation in the width direction under a side impact collision load.

[0018] For example, in a plug-in hybrid electric vehicle (PHEV), clearance on the right side is secured by arranging an exhaust pipe on the right side. Therefore, the influence of a side impact collision load on the right side is less significant. Therefore, it is preferable that the floor bracket 24 be mounted on the side opposite the right side, where the influence of a side impact collision load is significant, and accordingly, the second mounting portion 22 is arranged closer to the exhaust pipe than the first mounting portion 21.

[0019] As shown in the view below in Fig. As shown in Figure 2, the bracket 20 has the step between the first attachment portion 21 and the second attachment portion 22. This makes it possible to induce torsion on the side subject to a side impact collision load.

[0020] Here, the deformation of the bracket 20, the floor reinforcement 23, the floor bracket 24 and the floor plate 25 under a side impact collision load is calculated using Fig. 3A, Fig. 3B and Fig. 3C. The Fig. 3A, Fig. 3B and Fig. 3C represents a starting point from which each of the bracket 20, the floor reinforcement 23, the floor bracket 24, and the floor plate 25 undergoes rotational deformation in the arrow direction when a side impact collision load is input.

[0021] As in Fig. 3A, under a side impact collision load, the floor reinforcement 23 and the floor bracket 24 rotate with an intermediate edge as a starting point and can thereby inhibit the progress of the deformation of the floor reinforcement 23.

[0022] As in Fig. 3B, the bracket 20 rotates with a base portion of the step as a starting point under a side impact collision load and can thereby inhibit the progression of deformation of the bracket 20 at the second attachment portion 22.

[0023] As in Fig. As shown in Figure 3C, the bottom plate 25 rotates upon a side impact collision load, so that it is lifted from the deformation starting point in the UPR direction. This rotation can prevent the bottom plate 25 from protruding in the direction opposite to the UPR, i.e., downward, and thereby interfering with the battery pack 10.

[0024] As shown in the top view of the battery pack 10 in Fig. 4, it is preferred that the first fastening portion 21 and the second fastening portion 22 of the holder 20 are arranged at the same distance from the center of gravity of the battery pack 10.

[0025] Spot welding points in the floor reinforcement 23, the floor bracket 24, and the floor plate 25 around the first fixing portion 21 and the second fixing portion 22 are almost equal when considering a shunt current during spot welding, etc. The application of a large load to the side where rotation occurs may trigger further rotation and thus increase the amount of uplift of the floor plate 25. On the other hand, the stresses on the floor plate 25 and the spot welded areas increase, resulting in separation of the spot welds and perforation of the floor plate 25.

[0026] On the other hand, when the first fastening portion 21 and the second fastening portion 22 are provided at the same distance from the center of gravity of the battery pack 10, the moments become equal. Accordingly, the loads introduced into the first fastening portion 21 and the second fastening portion 22 can also be balanced. Thus, the loads on the bottom plate 25 and the spot welds can be unified, so that a side impact collision load can be absorbed at the second fastening portion 22 to prevent the progression of the side impact collision while preventing the separation of the spot welds and the perforation of the bottom plate 25.

[0027] As described, an in-vehicle battery pack can be provided that can prevent interaction between the floor panel and the battery when a side impact collision load is applied.

[0028] This invention is not limited to that described above and may be modified to a certain extent without departing from its essence. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2022 - 111 787 A [0002, 0003]

Claims

[1] An on-board battery pack having a bracket provided on a front or rear side of the battery pack, wherein the bracket comprises at least two fastening sections, a first fastening section is attached to a floor reinforcement, a second fastening section is fastened to a floor bracket attached to a floor plate at a position below the first fastening section, and the first fastening portion and the second fastening portion are arranged at different positions in a width direction of the bracket. [2] The in-vehicle battery pack according to claim 1, wherein the first fixing portion and the second fixing portion are arranged at an equal distance from a center of gravity of the battery. [3] The in-vehicle battery pack according to claim 1, wherein the second attachment portion is located closer to an exhaust pipe than the first attachment portion.

Images