JP6686758B2 - Battery case - Google Patents

Description

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

  Conventionally, various types of batteries arranged on the bottom surface of a vehicle have been proposed. For example, the battery described in Japanese Unexamined Patent Application Publication No. 2010-284084 includes a battery box arranged under the floor of the vehicle.

  The battery box includes a battery pan on which a battery is placed, an outer peripheral frame formed so as to project from an outer peripheral portion of the battery pan, and a cover which 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 Unexamined Patent Publication No. 2010-284948, when a foreign object collides from the side surface of the vehicle, the foreign object first collides with the outer peripheral frame, and an impact force is applied to the outer peripheral frame. Since the outer peripheral frame is provided on the peripheral wall portion, the peripheral wall portion of the battery box is dented, and as a result, the entire battery box is largely 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 the front-rear direction of the vehicle. Is to provide a battery case in which is suppressed.

  The battery case described in the present specification is a battery case arranged on the bottom surface of a vehicle, and includes a bottom plate located 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 portion of the bottom plate is formed so as to project outward from the peripheral wall portion. On the lower surface of the bottom plate, ribs that extend in the vehicle width direction and the vehicle front-rear direction and project downward are formed, and the thickness of the outer peripheral edge portion of the bottom plate is greater than the thickness of the center portion of the bottom plate. Is also thickly formed.

  According to the above battery case, since the bottom plate projects outward from the peripheral wall portion, when foreign matter collides from the side surface side of the battery case or the like, the foreign matter collides with the outer peripheral edge portion of the bottom plate and the foreign matter collides with the peripheral wall portion. 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 prevented from being deformed by the impact force applied from the foreign matter. Further, even when the uneven portion of the ground and the battery case are in contact with each other, each rib protrudes downward from the bottom plate, and the uneven portion of the ground comes into contact with the rib, so that the bottom plate is different from the case without the rib. Can be suppressed.

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

FIG. 1 is a schematic diagram schematically showing a vehicle 1 equipped with a battery case according to the present 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. FIG. 3 is a plan view showing a case body 10. It is sectional drawing in the IV-IV line shown in FIG. It is sectional drawing which shows the structure of the outer peripheral edge part 17 and its circumference. FIG. 3 is a plan view showing a state in which a foreign body 20 has collided with the case body 10 from the left side L of the vehicle 1. FIG. 4 is a cross-sectional view showing a collision position of the foreign matter 20 and its vicinity.

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

  FIG. 1 is a schematic diagram schematically showing a vehicle 1 equipped with a battery case according to the present embodiment. Note that, in FIG. 1 and the like, “U” indicates vertically upward and “D” vertically downward. 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, a vehicle 1 includes a floor panel 2 forming a bottom surface of the vehicle, and a battery 3 arranged on a lower surface of the 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 the lower side.

  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 located below the floor panel 2, and a peripheral wall portion 13 formed on an 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 on 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 ribs 18 and 19 are formed so as to project 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 within a range in which the flow of molten metal when manufacturing by die casting is good.

  FIG. 3 is a plan view showing the case 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 so as to project outward from the peripheral wall portion 13, and the outer peripheral edge portion 17 projects 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 project outside the peripheral wall portion 13 over the entire circumference, but it may be partially projected. For example, the outer peripheral edge portion 17 may be projected in the width direction of the vehicle 1, or the outer peripheral edge portion 17 may be projected in the front-rear direction of the vehicle 1.

  The arm 6 shown in FIG. 2 is connected to the outer peripheral edge portion 17, and connects the outer peripheral edge portion 17 and the body of the vehicle 1. 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. 5 is a cross-sectional view showing the configuration of the outer peripheral edge portion 17 and its surroundings. 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 T2 of the thick portion 30 is larger than the thickness T1 of the central portion of the bottom plate 12. It is formed to be thick. The thick wall portion 30 reaches the center side of the bottom plate 12 more 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 has a flat surface on the center side of the bottom plate 12 with respect to the inclined surface 23, and the bottom plate 12 is formed to have a constant thickness T1.

  The resin lid 11 is arranged on the upper surface of the flange 16, and the resin lid 11 is fixed to the flange 16 with bolts 21. A seal 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. FIG. 6 is a plan view showing a state in which the foreign matter 20 has collided with the case body 10 from the left side L of the vehicle 1, and FIG. 7 is a sectional view showing the collision position of the foreign matter 20 and its vicinity.

  As shown in FIGS. 6 and 7, the foreign matter 20 first collides with the outer peripheral edge portion 17 of the bottom plate 12. Therefore, contact of the foreign matter 20 with the peripheral wall portion 13 is suppressed, and deformation of the peripheral wall portion 13 is suppressed.

  As shown in FIG. 7, since the thickness T2 of the outer peripheral edge portion 17 is large, the outer peripheral edge portion 17 is prevented from being deformed even if an impact force is applied from the foreign matter 20. Further, the impact force F applied from the foreign matter 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. Therefore, there is no peripheral wall portion 13 in the passage of the impact force F, and deformation of the peripheral wall portion 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 prevent the sealing property between the peripheral wall portion 13 and the resin lid 11 from being deteriorated, and the impact force F is applied to the battery case 5. Even in this case, it is possible to prevent water and the like from entering the battery case 5.

  Here, “P” in FIG. 6 indicates the collision center of the foreign matter 20. Here, a large load is applied to the portion of the bottom plate 12 located near the collision center P. The load disperses as the distance from the collision center P increases, and the load applied to the portion of the bottom plate 12 away from the collision center P decreases.

  For example, at the position of the radius R1 from the collision center P in the bottom plate 12, the stress σ1 applied per unit area of the cross section of the bottom plate 12 is at the position of the radius R2 (radius R2> radius R1) from the collision center P. 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 separated from the collision center P by the radius R1 is thicker than the thickness at the position separated from the collision center P by the radius R2, the 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 the impact force is applied from one side surface of the battery case 5 has been described. However, even when the foreign matter 20 collides from both side surfaces of the battery case 5, the foreign matter 20 can contact the peripheral wall portion 13 as well. The deformation of the bottom plate 12 can be suppressed.

  Further, even if the foreign matter 20 collides with the battery case 5 from the front or the rear of the vehicle 1, the foreign matter 20 comes into contact with the outer peripheral edge portion 17 and the foreign matter 20 is prevented from coming into contact with the peripheral wall portion 13. Thereby, the sealing property of the battery case 5 can be maintained. Further, 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 matter 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 property.

  When the vehicle 1 is traveling on an uneven road surface, the central portion 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 project 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. This can prevent the base plate 24 from being greatly deformed.

  Although the embodiments have been described above, the embodiments disclosed this time are exemplifications in all respects, and are not restrictive. The technical scope of the present invention is shown by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

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

  1 vehicle, 2 floor panel, 3 battery, 4 battery module, 5 battery case, 6 arms, 10 case body, 11 resin lid, 12 bottom plate, 13 peripheral wall portion, 14 upper surface, 15 lower surface, 16 flange, 17 outer peripheral edge portion, 18 and 19 ribs, 20 foreign matter, 21 bolts, 22 sealing members, 23 inclined surfaces, 30 thick parts, F impact force, L left direction, P collision center, R1 and R2 radii, T1 and T2 thickness.

Claims (1)

A battery case arranged 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,
Equipped with
The outer peripheral edge portion of the bottom plate is formed so as to protrude outward from the peripheral wall portion,
The bottom surface of the bottom plate is formed with a rib extending in the width direction of the vehicle and the front-rear direction of the vehicle, and protruding downward.
The thickness of the outer peripheral edge portion of the bottom plate is formed to be thicker than the thickness of the central portion of the bottom plate,
On the lower surface of the bottom plate, an inclined surface is formed so that the thickness of the bottom plate becomes thinner from the outer peripheral edge portion toward the central portion of the bottom plate,
The outer peripheral edge portion of the bottom plate and the vehicle body are connected by an arm, and the impact force applied to the outer peripheral edge portion is transmitted from the bottom plate to the body through the arm, whereby the impact force is applied. The battery case does not pass through the peripheral wall portion.

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