JP2018012354A - Battery case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery case which inhibits deformation when an impact force is applied from the side surface side of a vehicle or a fore and aft direction of the vehicle.SOLUTION: A battery case is disposed on a bottom surface of a vehicle and includes: a bottom plate 12 positioned below the bottom surface; and a peripheral wall part 13 extending from the bottom plate 12 toward the bottom surface of the vehicle. An outer peripheral edge part 17 of the bottom plate 12 is formed so as to protrude to the outer side of the peripheral wall part 13. Ribs 18, 19 which extend in a width direction of the vehicle and a fore and aft direction of the vehicle and protrude downward are formed on a lower surface of the bottom plate 12. A thickness of the outer peripheral edge part 17 of the bottom plate 12 is formed thicker than a thickness of a center part of the bottom plate 12.SELECTED DRAWING: Figure 5

Description

  The battery case described in the present specification relates to a battery case disposed on the bottom surface of a vehicle.

  Various types of batteries have been proposed for batteries arranged on the bottom of vehicles. For example, a battery described in Japanese Patent Application Laid-Open No. 2010-284984 includes a battery box arranged on the under floor side of a vehicle.

  The battery box includes a battery pan on which the battery is placed, an outer peripheral frame formed to protrude from the outer peripheral portion of the battery pan, and a cover that covers the battery pan from above.

  The battery pan includes a bottom surface and a peripheral wall portion extending upward from an outer peripheral edge portion of the bottom surface, and the outer peripheral frame is provided so as to project outward from the peripheral wall portion.

JP 2010-284984 A

  In the battery box described in Japanese Patent Application Laid-Open No. 2010-284984, when a foreign object collides from the side of the vehicle, the foreign object first collides with the outer frame, and an impact force is applied to the outer frame. Since the outer peripheral frame is provided on the peripheral wall portion, the peripheral wall portion of the battery box is recessed, and as a result, the entire battery box is greatly deformed.

  The battery case described in the present specification has been made in view of the above problems, and its purpose is to deform when an impact force is applied from the side of the vehicle or from the front-rear direction of the vehicle. It is to provide a battery case in which is suppressed.

  The battery case described in the present specification is a battery case disposed on the bottom surface of the vehicle, and includes a bottom plate positioned below the bottom surface and a peripheral wall portion extending from the bottom plate toward the bottom surface of the vehicle. The outer peripheral edge of the bottom plate is formed so as to protrude outward from the peripheral wall. Ribs that extend in the width direction of the vehicle and in the front-rear direction of the vehicle and project downward are formed on the bottom surface of the bottom plate. The thickness of the outer peripheral edge of the bottom plate is greater than the thickness of the center portion of the bottom plate. Is also formed thick.

  According to the battery case, since the bottom plate protrudes outward from the peripheral wall portion, when a foreign object collides from the side surface side of the battery case or the like, it collides with the outer peripheral edge of the bottom plate and the foreign material collides with the peripheral wall portion. This can be suppressed. Further, since the bottom plate is formed with ribs extending in the width direction and the front-rear direction of the vehicle, the bottom plate is suppressed from being deformed by an impact force applied from a foreign object. In addition, even when the uneven portion of the ground and the battery case are in contact with each other, the bottom plate protrudes downward from each rib or the bottom plate, compared with the case where the uneven portion of the ground and the rib are in contact and there is no rib. Can be suppressed.

  According to the battery case described in the present specification, deformation of the battery case can be suppressed when an impact force is applied from the side of the vehicle or from the front-rear direction of the vehicle.

It is a mimetic diagram showing typically vehicle 1 carrying a battery case concerning this embodiment. It is a perspective view which shows the battery case 5, and is a perspective view when the battery case 5 is seen from the lower side. 2 is a plan view showing a case body 10. FIG. It is sectional drawing in the IV-IV line shown in FIG. It is sectional drawing which shows the outer periphery part 17 and the structure of the circumference | surroundings. 2 is a plan view showing a state in which a foreign object 20 collides with a case body 10 from the left direction L side of the vehicle 1. It is sectional drawing which shows the collision position of the foreign material 20, and its vicinity.

  The battery case according to the present embodiment will be described with reference to FIGS. In the configuration shown in FIGS. 1 to 7, the same or substantially the same configuration may be denoted by the same reference numeral, and redundant description may be omitted.

  FIG. 1 is a schematic diagram schematically showing a vehicle 1 on which a battery case according to the present embodiment is mounted. In FIG. 1 and the like, “U” indicates an upper vertical direction, and “D” indicates a lower vertical direction. Further, “F” indicates the vehicle front direction, “B” indicates the vehicle rear direction, “L” indicates the vehicle left direction, and “R” indicates the vehicle right direction.

  As shown in FIG. 1, vehicle 1 includes a floor panel 2 that forms the bottom surface of the vehicle, and a battery 3 that is disposed on the lower surface of floor panel 2. The battery 3 includes a battery module 4 including a plurality of battery cells and a battery case 5 that houses the battery module 4.

  FIG. 2 is a perspective view showing the battery case 5, and is a perspective view when the battery case 5 is viewed from below.

  The battery case 5 is fixed to the lower surface side of the floor panel 2 by a plurality of arms 6 connected to the floor panel 2 and the like. The battery case 5 includes a case body 10 and a resin lid 11. The case body 10 includes a bottom plate 12 positioned below the floor panel 2 and a peripheral wall portion 13 formed on the upper surface 14 of the bottom plate 12. The peripheral wall portion 13 extends from the upper surface 14 of the bottom plate 12 toward the floor panel 2, and a plurality of flanges 16 are formed at the upper end portion of the peripheral wall portion 13. The resin lid 11 is fixed to the flange 16 with bolts.

  The bottom plate 12 includes a base plate 24 and a plurality of ribs 18 and ribs 19 formed on the lower surface 15 of the base plate 24. The rib 18 extends in the front-rear direction of the vehicle 1, and the rib 19 extends in the left-right direction of the vehicle 1. The rib 18 and the rib 19 are formed so as to protrude downward from the lower surface 15. The case body 10 is manufactured by die casting, and the rib widths and pitches of the ribs 18 and 19 are set in a range in which the hot water flow is good when manufactured by die casting.

  FIG. 3 is a plan view showing the case main body 10. As shown in FIG. 3, the peripheral wall portion 13 is formed in an annular shape on the upper surface 14 of the bottom plate 12. The outer peripheral edge portion 17 of the bottom plate 12 is formed to protrude outward from the peripheral wall portion 13, and the outer peripheral edge portion 17 protrudes outward from the flange 16 of the peripheral wall portion 13. In the example shown in FIG. 3, the outer peripheral edge portion 17 is formed so as to protrude outward from the peripheral wall portion 13 over the entire periphery, but may be partially protruded. For example, the outer peripheral edge 17 may be protruded in the width direction of the vehicle 1, or the outer peripheral edge 17 may be protruded in the front-rear direction of the vehicle 1.

  2 is connected to the outer peripheral edge portion 17, and connects the outer peripheral edge portion 17 and the vehicle 1 body. A plurality of arms 6 are provided on each of the left side surface and the right side surface of the battery case 5.

  4 is a cross-sectional view taken along the line IV-IV shown in FIG. 3, and FIG. As shown in FIGS. 4 and 5, a thick portion 30 is formed on the outer peripheral edge portion 17 of the bottom plate 12, and the thickness T <b> 2 of the thick portion 30 is larger than the thickness T <b> 1 of the center portion of the bottom plate 12. It is formed to be thick. The thick portion 30 reaches the center side of the bottom plate 12 rather than the peripheral wall portion 13.

  The base plate 24 is formed so as to become thinner from the thick portion 30 toward the center of the bottom plate 12, and an inclined surface 23 is formed on the lower surface 15 of the base plate 24.

  The upper surface 14 of the bottom plate 12 is formed in a flat surface shape, and the inclined surface 23 is inclined so as to approach the upper surface 14 as the distance from the thick portion 30 increases. The inclination angle θ of the upper surface 14 is, for example, about 5 degrees. The lower surface 15 is flat on the center side of the bottom plate 12 with respect to the inclined surface 23, and the thickness of the bottom plate 12 is constant at the thickness T1.

  A resin lid 11 is disposed on the upper surface of the flange 16, and the resin lid 11 is fixed to the flange 16 by bolts 21. A sealing member 22 is provided between the resin lid 11 and the peripheral wall portion 13 to ensure the sealing performance of the battery case 5.

  An impact force may be applied from the outside to the battery case 5 configured as described above. 6 is a plan view showing a state in which the foreign object 20 has collided with the case main body 10 from the left direction L side of the vehicle 1, and FIG. 7 is a cross-sectional view showing the collision position of the foreign object 20 and its vicinity.

  As shown in FIGS. 6 and 7, the foreign material 20 first collides with the outer peripheral edge portion 17 of the bottom plate 12. For this reason, it is suppressed that the foreign material 20 contacts the surrounding wall part 13, and it is suppressed that the surrounding wall part 13 deform | transforms.

  As shown in FIG. 7, since the thickness T2 of the outer peripheral edge portion 17 is thick, even when an impact force is applied from the foreign material 20, the outer peripheral edge portion 17 is prevented from being deformed. Further, the impact force F applied from the foreign material 20 is transmitted from the bottom plate 12 to the body of the vehicle 1 through the arm 6 provided on the right side surface of the battery case 5. For this reason, there is no peripheral wall part 13 in the passage route of the impact force F, and deformation of the peripheral wall part 13 and the flange 16 is suppressed.

  Since the deformation of the peripheral wall portion 13 and the flange 16 is suppressed, it is possible to suppress a decrease in the sealing performance between the peripheral wall portion 13 and the resin lid 11, and the impact force F is applied to the battery case 5. However, it is possible to prevent water or the like from entering the battery case 5.

  Here, “P” in FIG. 6 indicates the collision center of the foreign object 20. Here, a large load is applied to a portion of the bottom plate 12 located in the vicinity of the collision center P. Then, as the distance from the collision center P increases, the load is dispersed, and the load applied to the portion of the bottom plate 12 away from the collision center P becomes smaller.

  For example, the stress σ1 applied per unit area of the cross section of the bottom plate 12 at the position of the radius R1 from the collision center P in the bottom plate 12 is the bottom plate 12 at the position of the radius R2 (radius R2> radius R1) from the collision center P. It is larger than the stress σ2 applied per unit area of the cross section.

  On the other hand, as shown in FIG. 7, since the thickness at the position away from the collision center P by the radius R1 is thicker than the thickness at the position away from the collision center P by the radius R2, deformation of the bottom plate 12 is suppressed. . Further, as shown in FIG. 2, a plurality of ribs 19 extending in the left-right direction of the vehicle 1 are provided, and deformation of the bottom plate 12 is suppressed.

  Thereby, even if the impact force F is applied from the side surface side of the battery case 5, the deformation of the bottom plate 12 can be suppressed.

  The case where an impact force is applied from one side surface of the battery case 5 has been described. Similarly, when the foreign object 20 collides from both side surfaces of the battery case 5, the foreign object 20 can contact the peripheral wall portion 13. The deformation of the bottom plate 12 can be suppressed.

  Even if the foreign object 20 collides with the battery case 5 from the front or the rear of the vehicle 1, the foreign object 20 is prevented from coming into contact with the outer peripheral edge portion 17 and the foreign material 20 is prevented from coming into contact with the peripheral wall portion 13. Thereby, the sealing performance of the battery case 5 can be maintained. The bottom plate 12 is provided with a plurality of ribs 18 extending in the front-rear direction of the vehicle 1, and deformation of the bottom plate 12 is suppressed. Thus, even if the foreign object 20 collides with the battery case 5 from the front-rear direction of the vehicle 1, it is possible to suppress the deformation of the battery case 5 and maintain the sealing performance.

  When the vehicle 1 is traveling on an uneven road surface, the center of the battery case 5 may come into contact with the road surface. At this time, the ribs 18 and 19 formed on the lower surface 15 of the base plate 24 protrude downward from the lower surface 15 and come into contact with the ribs 18 and 19 before the ground and the base plate 24 directly contact each other. Thereby, it can control that base board 24 changes greatly.

  Although the embodiments have been described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The battery described in this specification can be applied to a battery mounted on a vehicle.

  DESCRIPTION OF SYMBOLS 1 Vehicle, 2 Floor panel, 3 Battery, 4 Battery module, 5 Battery case, 6 Arm, 10 Case main body, 11 Resin cover, 12 Bottom plate, 13 Perimeter wall part, 14 Upper surface, 15 Lower surface, 16 Flange, 17 Outer peripheral edge part, 18, 19 Rib, 20 Foreign object, 21 bolt, 22 Seal member, 23 Inclined surface, 30 Thick part, F Impact force, L Left direction, P Collision center, R1, R2 radius, T1, T2 thickness.

Claims (1)

A battery case disposed on the bottom of the vehicle,
A bottom plate located below the bottom surface;
A peripheral wall portion extending from the bottom plate toward the bottom surface of the vehicle;
With
The outer peripheral edge of the bottom plate is formed so as to protrude outward from the peripheral wall,
On the lower surface of the bottom plate, a rib that extends in the width direction of the vehicle and the front-rear direction of the vehicle and protrudes downward is formed.
The battery case, wherein the outer peripheral edge portion of the bottom plate is formed thicker than the central portion of the bottom plate.

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