JP2013133046A - Battery mounting structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure for a vehicle capable of restraining bending deformation of a battery side frame in a side collision.SOLUTION: A battery module 32 is arranged under a floor panel 16. A rocker 20 having a closed cross-sectional structure and extending in the vehicle longitudinal direction, is arranged in an end part in the vehicle width direction of the floor panel 16. The first battery side frame 50 having a closed cross-sectional structure is arranged outside in the vehicle width direction of the battery module 32. An outside part 50Ro on the outside in the vehicle width direction of the first battery side frame 50 is joined from below to an inside part 20Ri on the inside in the vehicle width direction of the rocker 20.

Description

  The present invention relates to a vehicle battery mounting structure.

  There is known a battery frame mounting structure for an electric vehicle including a battery frame that supports a battery below a floor panel (for example, Patent Document 1). In the technique disclosed in Patent Document 1, a spacer is disposed between a battery side frame (side frame) and a side sill of the battery frame. The spacer functions as a load transmission member that transmits a side collision load input to the side sill to the battery side frame during a vehicle side collision (hereinafter simply referred to as “side collision”).

JP 7-246845 A

  However, in the technique disclosed in Patent Document 1, when the battery side frame is bent and deformed so as to project toward the battery side due to a side collision load transmitted from the side sill to the battery side frame at the time of a side collision, the battery of the battery side frame There is a possibility that the amount of intrusion to the side increases and the battery side frame contacts the battery.

  In view of the above-described facts, an object of the present invention is to provide a vehicle battery mounting structure that can suppress bending deformation of a battery side frame at the time of a side collision.

  The battery mounting structure for a vehicle according to claim 1 has a battery module disposed below the vehicle floor, a closed cross-sectional structure, and is disposed along an end of the vehicle floor in the vehicle width direction. A rocker extending in the direction, and a closed cross-sectional structure, arranged outside the vehicle width direction of the battery module along the vehicle front-rear direction to support the battery module and located outside the vehicle width direction Includes a first battery side frame coupled to an inner portion of the rocker positioned on the inner side in the vehicle width direction.

  According to the vehicle battery mounting structure of the first aspect, the first battery side frame is disposed outside the battery module in the vehicle width direction. The outer portion of the first battery side frame located outside the vehicle width direction is overlapped with the inner portion of the rocker located inside the vehicle width direction and coupled to the inner portion. Thereby, the side collision load input to the rocker at the time of the side collision is transmitted to the first battery side frame.

  Here, for example, when the rocker is bent and deformed so as to protrude toward the battery module (inner side in the vehicle width direction) due to a side impact load (hereinafter, this deformation may be simply referred to as “bending deformation”), While a compressive force acts on the inner part located inside the vehicle width direction, a tensile force acts on the outer part located outside the rocker in the vehicle width direction. Similarly, when the first battery side frame is bent and deformed to project toward the battery module side (inner side in the vehicle width direction) due to the side impact load transmitted from the rocker, the first battery side frame in the vehicle width direction While the compressive force acts on the outer portion located outside, the tensile force acts on the inner portion located on the inner side in the vehicle width direction of the first battery side frame.

  In the present invention, the inner portion of the rocker and the outer portion of the first battery side frame are combined, so that when the rocker and the first battery side frame are bent and deformed, the tensile force acting on the inner portion of the rocker and the first The compressive force acting on the battery side frame cancels out. Thereby, since the bending deformation of the rocker and the first battery side frame is suppressed, the amount of penetration of the rocker and the first battery side frame into the battery module is reduced. Therefore, damage to the battery is suppressed.

  A vehicle battery mounting structure according to a second aspect is the vehicle battery mounting structure according to the first aspect, wherein an upper wall portion constituting the closed cross-sectional structure of the first battery side frame is the closed of the rocker. The lower wall portion constituting the cross-sectional structure is overlapped from below and coupled to the lower wall portion.

  According to the vehicle battery mounting structure according to claim 2, the upper wall part constituting the closed cross-sectional structure of the first battery side frame is overlapped from below with the lower wall part constituting the closed cross-sectional structure of the rocker. Connected to the part. As a result, the tensile force acting on the inner side of the rocker during a side collision and the compressive force acting on the outer side of the first battery side frame are transmitted to each other between the contact surfaces of the lower wall portion and the upper wall portion. These tensile force and compressive force cancel each other. Therefore, since the bending deformation of the rocker and the first battery side frame is suppressed, the amount of penetration of the rocker and the first battery side frame into the battery module side is reduced.

  Further, by assembling the upper wall portion of the first battery side frame onto the lower wall portion of the rocker from below and coupling to the lower wall portion, the assembling property of the first battery side frame to the rocker is improved.

  The vehicle battery mounting structure according to claim 3 is the vehicle battery mounting structure according to claim 2, wherein the rocker is disposed to face the vehicle width direction and constitutes the closed cross-sectional structure. A pair of upper flanges extending from the upper ends of the pair of body portions to the upper side in the vehicle vertical direction and coupled to each other; and from the lower ends of the pair of body portions to the lower side in the vehicle vertical direction A pair of lower flange portions each extending and coupled to each other, and an outer side wall portion of the first battery side frame in the vehicle width direction is connected to the pair of lower flange portions in the vehicle width direction. It is abutted from the inside.

  According to the vehicle battery mounting structure according to claim 3, the outer side wall portion of the first battery side frame in the vehicle width direction is brought into contact with the pair of lower flange portions of the rocker from the inner side in the vehicle width direction. Accordingly, the rocker and the first battery side frame are more rigid with respect to bending deformation than the configuration in which the side wall portion of the first battery side frame is not brought into contact with these lower flange portions. Therefore, bending deformation of the rocker and the first battery side frame is further suppressed.

  The vehicle battery mounting structure according to claim 4 is the vehicle battery mounting structure according to claim 3, wherein a corner portion where the upper wall portion and the side wall portion in the first battery side frame are connected is provided. The lower wall portion and the lower flange portion of the rocker are fitted to corners to be connected.

  According to the vehicle battery mounting structure of the fourth aspect, the corner portion where the upper wall portion and the side wall portion of the first battery side frame are connected is the corner where the lower wall portion and the lower flange portion of the rocker are connected. Adapted to the department. Thereby, the ridgeline of the corner of the first battery side frame comes close to the ridgeline of the corner of the rocker. Therefore, the rocker and the first battery side frame are more rigid with respect to bending deformation than the configuration in which the corners of the first battery side frame are not aligned with the corners of the rocker. Therefore, bending deformation of the rocker and the first battery side frame is further suppressed.

  The vehicle battery mounting structure according to claim 5 is the vehicle battery mounting structure according to any one of claims 1 to 4, wherein the frame main body portion has a closed cross-sectional structure; A pair of flange portions extending from the outer side wall portion in the vehicle width direction to the outer side in the vehicle width direction and opposed to each other in the vehicle vertical direction, between the first battery side frame and the battery module A second battery side frame disposed along the vehicle front-rear direction and attached to the vehicle floor is provided, and an inner portion of the first battery side frame located on the inner side in the vehicle width direction is between the pair of flange portions. Are respectively connected to the flange portions.

  According to the vehicle battery mounting structure of the fifth aspect, the second battery side frame includes a frame main end portion having a closed cross-sectional structure and a side wall portion outside the vehicle width direction of the frame main end portion in the vehicle width direction. A pair of flange portions that extend outward and face each other in the vehicle vertical direction are provided. An inner portion of the first battery side frame located on the inner side in the vehicle width direction is inserted between the pair of flange portions, and the inner wall portions are coupled to the pair of flange portions, respectively. As a result, the tensile force acting on the inner side of the first battery side frame and the compressive force acting on the pair of flange portions of the second battery side frame cancel each other. Therefore, since the bending deformation of the frame main body portions of the first battery side frame and the second battery side frame is suppressed, the amount of penetration of the first battery side frame and the second battery side frame into the battery module side is reduced. Therefore, damage to the battery is suppressed.

  Further, by attaching the second battery side frame to the vehicle floor, a side collision load input to the rocker at the time of a side collision is transmitted to the vehicle floor via the first battery side frame and the second battery side frame. Therefore, bending deformation of the rocker, the first battery side frame, and the second battery side frame is further suppressed.

  As described above, according to the vehicle battery mounting structure of the present invention, bending deformation of the battery side frame at the time of a side collision can be suppressed.

It is the longitudinal cross-sectional view which looked at the vehicle body floor part of the vehicle to which the vehicle battery mounting structure concerning one Embodiment of this invention was applied from the rear side of the vehicle front-back direction. It is an expanded sectional view of FIG. 1 which shows the rocker and 1st battery side frame in one Embodiment of this invention. It is the top view which looked at the rocker, 1st battery side frame, and 2nd battery side frame in one Embodiment of this invention from the vehicle up-down direction upper side. It is a perspective view which shows typically the bending deformation state of the rocker in one Embodiment of this invention. (A) And (B) is the expanded sectional view of FIG. 1 which shows the 1st battery side frame and 2nd battery side frame in one Embodiment of this invention.

  Hereinafter, a vehicle battery mounting structure according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that an arrow FR appropriately shown in each drawing indicates the front side in the vehicle longitudinal direction, an arrow UP indicates the upper side in the vehicle vertical direction, and an arrow LH indicates the outside in the vehicle width direction (the left side of the vehicle body).

  FIG. 1 is a longitudinal sectional view of a vehicle body floor portion 14 of a vehicle 12 to which a vehicle battery mounting structure 10 according to the present embodiment is applied as viewed from the rear side in the vehicle front-rear direction. The vehicle 12 is, for example, an electric vehicle, a gasoline hybrid vehicle, a fuel cell hybrid vehicle, or the like that travels using an electric motor (motor) (not shown) as a drive source, and the electric motor is located below the floor panel 16 constituting the vehicle floor in the vehicle vertical direction. A battery unit 30 that stores an electrode to be supplied to is mounted.

  The vehicle body floor 14 includes a floor panel 16 constituting a floor surface of the passenger compartment 18, a pair of rockers 20 provided along both ends of the floor panel 16 in the vehicle width direction, and a vehicle width of the pair of rockers 20. And a pair of floor under-reinforcements 28 arranged inside each direction. In FIG. 1, one of the pair of rockers 20 (the left side of the vehicle body) is shown, and one of the pair of floor under reinforcements 28 (the left side of the vehicle body) is shown.

  The pair of rockers 20 is a skeleton member that constitutes a lower skeleton on the side of the vehicle body, and extends in the vehicle front-rear direction. The rocker 20 includes a rocker outer panel 22 disposed along the vehicle front-rear direction, a rocker inner panel 24 disposed along the vehicle front-rear direction, and a rocker inner panel 24 disposed inside the rocker outer panel 22 in the vehicle width direction, A rocker reinforcement 26 is disposed between the outer panel 22 and the rocker inner panel 24.

  The rocker outer panel 22 is formed in a hat shape in cross section with an inner side in the vehicle width direction opened. Specifically, the rocker outer panel 22 includes a main body portion 22A having a substantially C-shaped cross section with an inner side opened in the vehicle width direction, and an upper flange extending upward from the upper end portion of the main body portion 22A in the vehicle vertical direction. Part 22B and lower flange part 22C extended from the lower end part of main part 22A to the lower side of the vehicle vertical direction.

  On the other hand, the rocker inner panel 24 is formed in a cross-sectional hat shape in which the outer side in the vehicle width direction is opened. Specifically, the rocker inner panel 24 includes a main body portion 24A having a substantially C-shaped cross section with an outer side in the vehicle width direction opened, and an upper side extending from the upper end portion of the main body portion 24A to the upper side in the vehicle vertical direction. It has a flange portion 24B and a lower flange portion 24C extending downward from the lower end portion of the main body portion 24A in the vehicle vertical direction.

  The rocker outer panel 22 and the rocker inner panel 24 are disposed so that the main body portions 22A and 24A face each other in the vehicle width direction, and the upper flange portions 22B and 24B are sandwiched between the rocker reinforcements 26 and The lower flange portions 22C and 24C are joined together by welding or the like. Thereby, the closed section structure is constituted by the main body portion 22A of the rocker outer panel 22 and the main body portion 24A of the rocker inner panel 24.

  Further, the lower wall portion 24A1 of the main body portion 24A of the rocker inner panel 24 is formed in a flat plate shape and is disposed substantially horizontally, and from the opening side end portion (the outer end portion in the vehicle width direction) to the lower flange. The portion 24C extends downward in the vehicle vertical direction. The lower wall portion 20 </ b> L of the rocker 20 is configured by the lower wall portion 24 </ b> A <b> 1 of the rocker inner panel 24.

  The rocker reinforcement 26 disposed between the rocker outer panel 22 and the rocker inner panel 24 is disposed along the vehicle front-rear direction, and has a cross-sectional hat shape in which the inner side in the vehicle width direction is opened like the rocker outer panel 22. Is formed. Specifically, the rocker reinforcement 26 includes a main body portion 26A having a substantially C-shaped cross section with an inner side opened in the vehicle width direction, and an upper side extending from the upper end portion of the main body portion 26A upward in the vehicle vertical direction. It has a flange portion 26B and a lower flange portion 26C that extends downward from the lower end portion of the main body portion in the vehicle vertical direction.

  The upper flange portion 26B of the rocker reinforcement 26 is disposed between the upper flange portion 22B of the rocker outer panel 22 and the upper flange portion 24B of the rocker inner panel 24, and these upper flange portions 22B and 24B are welded or the like. Are combined. Similarly, the lower flange portion 26C of the rocker reinforcement 26 is disposed between the lower flange portion 22C of the rocker outer panel 22 and the lower flange portion 24C of the rocker inner panel 24. The flange portions 22C and 24C are coupled by welding or the like. By this rocker reinforcement 26, the rocker outer panel 22 and the rocker inner panel 24 are reinforced.

  A floor under reinforcement 28 for reinforcing the floor panel 16 is disposed inside the rocker 20 in the vehicle width direction. The floor under reinforcement 28 is formed in a cross-sectional hat shape with an upper side in the vehicle vertical direction opened, and is joined to the lower surface 16A of the floor panel 16 by welding or the like. The floor under reinforcement 28 and the floor panel 16 constitute a closed cross-sectional structure. Further, the lower wall portion 28L of the floor under reinforcement 28 is a vehicle body side mounting portion to which a second battery side frame 60 described later is mounted.

  The battery unit 30 disposed below the floor panel 16 in the vehicle vertical direction includes a battery module 32, a battery frame 34 that supports the battery module 32, and a battery upper cover 38 that covers the battery module 32 from above in the vehicle vertical direction. And a battery lower cover 40 that covers the battery module 32 from the lower side in the vehicle vertical direction. The battery module 32 is a storage battery that stores electric power supplied to the above-described electric motor (not shown), and is disposed between the pair of rockers 20 when viewed from the vehicle vertical direction.

  The battery frame 34 includes a pair of battery side frame portions 36 disposed along the vehicle longitudinal direction on both sides of the battery module 32 in the vehicle width direction, and the vehicle module 32 along the vehicle width direction on both sides of the battery module 32 in the vehicle longitudinal direction. A pair of battery front frame portions and battery rear frame portions (not shown), which are respectively disposed, are formed in a frame shape as a whole. FIG. 1 shows one of the pair of battery side frame portions 36 (the left side of the vehicle body).

  The battery side frame portion 36 includes a first battery side frame 50 disposed outside the battery module 32 in the vehicle width direction, and a second battery side frame disposed between the first battery side frame 50 and the battery module 32. 60. The second battery side frame 60 includes a frame main body portion 62 attached to the floor panel 16, and a pair of upper flange portion 64A and lower flange portion 64B as a pair of flange portions coupled to the first battery side frame 50. Have.

  The frame main body portion 62 has a closed cross-sectional structure having a substantially rectangular cross section, and an end portion of the battery upper cover 38 in the vehicle width direction is coupled to the upper wall portion 62U by welding or the like, and an inner side wall in the vehicle width direction. The end of the battery lower cover 40 in the vehicle width direction is coupled to the portion 62S1 by welding or the like. The battery upper cover 38 and the battery lower cover 40 prevent rainwater, dust, and the like from entering the battery module 32 side. Further, the battery module 32 is supported by the battery side frame portion 36 via the battery lower cover 40.

  Further, the frame main body 62 is disposed below the floor under reinforcement 28 in the vehicle vertical direction. A cylindrical collar member 72 is disposed between the upper wall portion 62U of the frame main body portion 62 and the lower wall portion 28L of the floor under reinforcement 28. The collar member 72 is arranged with the vehicle vertical direction as an axial direction, and penetrates the collar member 72, the upper wall portion 62U of the frame main body portion 62, and the lower wall portion 28L of the floor under reinforcement 28 in the vehicle vertical direction. The frame main body 62 and the floor under reinforcement 28 are coupled to each other by the bolt 70 and the weld nut 74.

  It should be noted that working holes (not shown) for bolts 70 and weld nuts 74 are formed in the frame main body 62 and the floor under reinforcement 28 of the second battery side frame 60, respectively.

  Further, a pair of upper flange portion 64A and lower flange portion 64B to which the first battery side frame 50 is coupled are provided on the side wall portion 62S2 of the frame body portion 62 in the vehicle width direction. The pair of upper flange portion 64A and lower flange portion 64B extend in the vehicle front-rear direction along the side wall portion 62S2 of the frame main body portion 62, and extend outward from the upper end portion and the lower end portion of the side wall portion 62S2 in the vehicle width direction. It is out and is facing the vehicle up-down direction. The upper flange portion 64 </ b> A and the lower flange portion 64 </ b> B constitute an outer portion 60 </ b> Ro located outside the second battery side frame 60 in the vehicle width direction.

  The first battery side frame 50 is disposed outside the second battery side frame 60 in the vehicle width direction. The first battery side frame 50 has a closed cross-sectional structure having a substantially rectangular cross section with the long side in the vehicle width direction. An inner portion 50Ri of the first battery side frame 50 located on the inner side in the vehicle width direction is inserted between (inserted into) the upper flange portion 64A and the lower flange portion 64B of the second battery side frame 60. The upper flange portion 64A and the lower flange portion 64B are overlaid on the upper wall portion 50U and the lower wall portion 50L, respectively. Further, the inner side wall portion 50S1 of the second battery side frame 60 in the vehicle width direction is overlapped with the outer side wall portion 62S2 of the frame main body portion 62 of the second battery side frame 60 in the vehicle width direction.

  The upper wall portion 50U of the first battery side frame 50 and the upper flange portion 64A of the second battery side frame 60 are coupled by a bolt 76 and a weld nut 78 that respectively penetrate in the vehicle vertical direction. Further, the lower wall portion 50L of the first battery side frame 50 and the lower flange portion 64B of the second battery side frame 60 are coupled to each other by a bolt 76 and a weld nut 78 penetrating in the vehicle vertical direction. That is, the 1st battery side frame 50 and the 2nd battery side frame 60 are couple | bonded in the state which overlap | superposed each inner part 50Ri and the outer side part 60Ro seeing from the vehicle up-down direction. Thus, when the first battery side frame 50 and the second battery side frame 60 are bent and deformed so as to project toward the battery module 32 side (inner side in the vehicle width direction), the inner portion 50Ri of the first battery side frame 50. The tensile force acting on the second battery side frame 60 and the compressive force acting on the outer portion 60Ro of the second battery side frame 60 cancel each other. The first battery side frame 50 is appropriately formed with a work hole (not shown) for the weld nut 78.

  On the other hand, the outer portion 50Ro located outside the first battery side frame 50 in the vehicle width direction is arranged below the inner portion 20Ri located inside the rocker 20 in the vehicle width direction in the vehicle vertical direction. The upper wall portion 50U in the outer portion 50Ro of the first battery side frame 50 is overlapped with the lower wall portion 20L in the inner portion 20Ri of the rocker 20 from below in the vehicle vertical direction. The upper wall portion 50U of the outer side portion 50Ro and the lower wall portion 20L of the inner side portion 20Ri are coupled to each other by a bolt 80 and a nut 82 penetrating in the vehicle vertical direction.

  Further, the side wall portion 50S2 on the outer side in the vehicle width direction of the first battery side frame 50 is in contact (overlapped) with the lower flange portion 24C of the rocker inner panel 24 from the inner side in the vehicle width direction. Further, as shown in FIG. 2, the corner portion 50K where the upper wall portion 50U and the side wall portion 50S2 of the first battery side frame 50 are connected has a lower wall portion 20L and a lower flange portion 24C of the rocker 20. The corner 20K is connected (superposed) to the connected corner 20K, and the ridge line 50K1 of the corner 50K is close to the ridge 20K1 of the corner 20K of the rocker 20. Thereby, the rigidity of the rocker 20 and the 1st battery side frame 50 with respect to bending deformation is high.

Here, the bolts 80 for coupling the rocker 20 and the first battery side frame 50 is a diagram of closed cross-section structure of centroid C ₁ and the first battery side frame 50 of the closed cross section of the rocker 20 as viewed from the vertical direction of the vehicle is located between the heart C ₂ (length L). That is, the rocker 20 and the first battery side frame 50 are coupled between the centroids C ₁ and C ₂ . Thus, when the rocker 20 and the first battery side frame 50 are bent and deformed so as to protrude toward the battery module 32 (see FIG. 1), the tensile force acting on the inner portion 20Ri of the rocker 20 and the first battery side The compressive force acting on the outer portion 50Ro of the frame 50 cancels out.

Here, the centroid C ₁ of the closed section structure of the rocker 20 is a centroid of the closed section structure constituted by the rocker outer panel 22 and the rocker inner panel 24. Further, the inner portion 20Ri positioned inside of the vehicle width direction of the rocker 20 means a site inside of the vehicle width direction with respect to the centroid C ₁ closed cross section structure in the rocker 20, the vehicle width direction of the rocker 20 the outer portion 20Ro located outside the means sites outside of the vehicle width direction with respect to the centroid C ₁ closed cross section structure in the rocker 20. Similarly, the inner portions 50Ri, 60Ri of the first battery side frames 50 and the second battery side frames 60 positioned on the inner side in the vehicle width direction are the first battery side frames 50 and the second battery side frames 60. Means the inner part in the vehicle width direction with respect to the centroids C ₂ and C ₃ (see FIG. 1) of the closed cross-sectional structure in FIG. 1, and the first battery side frame 50 and the second battery side frame 60 in the vehicle width direction The outer portions 50Ro and 60Ro located on the outer side mean portions on the outer side in the vehicle width direction with respect to the centroids C ₂ and C ₃ of the closed sectional structure in each of the first battery side frame 50 and the second battery side frame 60. To do.

  Next, the operation of the vehicle battery mounting structure according to this embodiment will be described.

  As shown in FIG. 3, for example, a side collision load (concentration) from the outside in the vehicle width direction toward the battery module 32 (see FIG. 1) side (in the vehicle width direction) with respect to the local part of the rocker 20 at the time of a side collision. When the load (F) is applied, the rocker 20 may be bent and deformed so as to protrude toward the battery module 32.

  Here, FIG. 4 schematically shows the rocker 20 bent and deformed so as to protrude inward in the vehicle width direction. As shown in FIG. 4, when the rocker 20 is bent and deformed, a compressive force (black arrow) acts on the outer portion 20Ro of the rocker 20, and a tensile force (white arrow) acts on the inner portion 20Ri of the rocker 20. Similarly, as shown in FIG. 3, when the first battery side frame 50 and the second battery side frame 60 are bent and deformed so as to protrude toward the battery module 32, the outer portion of the first battery side frame 50. The compression force (black arrow) acts on the outer portion 60Ro of the 50Ro and the second battery side frame 60, and the tensile force (white) on the inner portion 50Ri of the first battery side frame 50 and the inner portion 60Ri of the second battery side frame 60. Each arrow) acts.

  In the present embodiment, the outer portion 50Ro of the first battery side frame 50 is superimposed on the inner portion 20Ri of the rocker 20 from below in the vehicle vertical direction, and the outer portion 50Ro of the first battery side frame 50 is overlapped with the inner portion 20Ri. Are combined. Specifically, as shown in FIG. 1, the upper wall portion 50U of the first battery side frame 50 is superimposed on the lower wall portion 20L of the rocker 20 from below in the vehicle vertical direction, and the lower wall portion 20L The upper wall portion 50U of the first battery side frame 50 is coupled. As a result, when the rocker 20 and the first battery side frame 50 are bent and deformed due to a side collision, the tensile force acting on the inner portion 20Ri of the rocker 20 and the compressive force acting on the outer portion 50Ro of the first battery side frame 50 are obtained. Are transmitted to each other between the contact surfaces of the lower wall portion 20L and the upper wall portion 50U, and the tensile force and the compressive force cancel each other. Therefore, bending deformation of the rocker 20 and the first battery side frame 50 is suppressed.

  Similarly, the outer side portion 60Ro of the second battery side frame 60 is overlapped on the inner side portion 50Ri of the first battery side frame 50 when viewed from the vehicle vertical direction, and the second battery side frame is overlapped with the inner side portion 50Ri. The outer part 60Ro of 60 is couple | bonded. Specifically, the outer portion 50Ro of the first battery side frame 50 is inserted between the upper flange portion 64A and the lower flange portion 64B constituting the outer portion 60Ro of the second battery side frame 60. The upper flange portion 64A and the lower flange portion 64B of the second battery side frame 60 are coupled to the upper wall portion 50U and the lower wall portion 50L of the portion 50Ro, respectively. Thus, when the first battery side frame 50 and the second battery side frame 60 are bent and deformed due to a side collision, the tensile force acting on the inner portion 50Ri of the first battery side frame 50 and the outer side of the second battery side frame 60 are detected. The compressive forces acting on the portion 60Ro (the upper flange portion 64A and the lower flange portion 64B) cancel each other. Accordingly, bending deformation of the first battery side frame 50 and the second battery side frame 60 is suppressed.

  As described above, in the present embodiment, since the rocker 20, the first battery side frame 50, and the second battery side frame 60 are prevented from being bent during a side collision, the rocker 20, the first battery side frame 50, And the amount of penetration of the first battery side frame 50 into the battery module 32 is reduced. Therefore, damage to the battery module 32 and the like are suppressed. Further, as a result of the bending deformation of the rocker 20, the first battery side frame 50, and the first battery side frame 50 being suppressed, the side collision of the rocker 20, the first battery side frame 50, and the first battery side frame 50 is achieved. Energy absorption performance is improved.

  In the present embodiment, the side wall portion 50S2 of the first battery side frame 50 is brought into contact with the lower flange portion 24C of the rocker inner panel 24 from the inside in the vehicle width direction, whereby the side wall portion of the first battery side frame 50 is contacted. Compared with the configuration in which the portion 50S2 is not brought into contact with the lower flange portion 24C of the rocker inner panel 24, the rigidity of the rocker 20 and the first battery side frame 50 against bending deformation is increased.

  Further, the corner portion 50K where the upper wall portion 50U and the side wall portion 50S2 in the first battery side frame 50 are connected is aligned with the corner portion 20K where the lower wall portion 20L and the lower flange portion 24C of the rocker 20 are connected. The edge 50K1 of the corner 50K is close to the edge 20K1 of the corner 20K of the rocker 20. Accordingly, the rocker 20 and the first battery side frame 50 are more rigid with respect to bending deformation than a configuration in which the corner 50K of the first battery side frame 50 is not aligned with the corner 20K of the rocker 20. Therefore, bending deformation of the rocker 20 and the first battery side frame 50 is further suppressed.

  Furthermore, since the second battery side frame 60 is attached to the floor panel 16 via the floor under reinforcement 28, the side collision load F (see FIG. 3) input to the rocker 20 at the side collision is the first battery side. It is transmitted to the floor panel 16 via the frame 50, the second battery side frame 60, the floor under reinforcement 28, and the like. Therefore, bending deformation of the rocker 20, the first battery side frame 50, and the second battery side frame 60 is further suppressed.

  In the present embodiment, as described above, the inner portion 50Ri of the first battery side frame 50 is inserted between the upper flange portion 64A and the lower flange portion 64B of the second battery side frame 60, and the inner side The upper wall portion 50U and the lower wall portion 50L of the portion 50Ri are coupled to the upper flange portion 64A and the lower flange portion 64B of the second battery side frame 60, respectively. Thus, the upper and lower flange portions 64A and 64B of the second battery side frame 60 restrain the deformation of the upper wall portion 50U and the lower wall portion 50L of the inner portion 50Ri of the first battery side frame 50 in the vehicle vertical direction. Is done. Therefore, for example, as shown by a two-dot chain line in FIG. 5A, the upper wall portion 50U and the lower wall portion 50L in the inner portion 50Ri of the first battery side frame 50 are convex in a direction away from each other due to a side collision. And the deformation of the inner wall 50Ri in the direction in which the upper wall portion 50U and the lower wall portion 50L are close to each other, as shown by the two-dot chain line in FIG. 5B, are suppressed. Is done. As a result, local buckling and the like of the upper wall portion 50U and the lower wall portion 50L in the inner portion 50Ri of the first battery side frame 50 are suppressed, so that the side battery energy absorption performance of the first battery side frame 50 is improved. .

  Furthermore, in the prior art (for example, Patent Document 1), it is necessary to insert a spacer from the vehicle front-rear direction between the battery side frame and the side sill while the battery is lifted by a lifter or the like. Work becomes complicated. On the other hand, in the present embodiment, the first battery side frame 50 upper wall portion 50U overlaps the lower wall portion 20L of the rocker 20 from below and is coupled to the lower wall portion 20L, whereby the first battery for the rocker 20 is connected. The assembling property of the side frame 50 is improved.

  Furthermore, in the conventional technology (for example, Patent Document 1), the battery side frame is disposed on the battery side (inside in the vehicle width direction) as much as the spacer is disposed between the side sill and the battery side frame. Mounting space is reduced. On the other hand, in the present embodiment, the first battery side frame 50 and the second battery side frame 60 are connected to the vehicle by the amount that the outer portion 50Ro of the first battery side frame 50 and the inner portion 20Ri of the rocker 20 overlap in the vehicle vertical direction. It can arrange | position to the outer side of the width direction. Therefore, the mounting space for the battery module 32 can be expanded. That is, it is possible to increase the capacity of the battery module 32 while suppressing damage to the battery module 32 and the like.

  Next, a modified example of the vehicle battery mounting structure according to the present embodiment will be described.

  In the above embodiment, the side wall portion 50S2 of the first battery side frame 50 is brought into contact with the lower flange portion 24C of the rocker 20 from the inside in the vehicle width direction, but the side wall portion 50S2 is brought into contact with the lower flange portion 24C. Instead, a gap may be formed between the side wall portion 50S2 and the lower flange portion 24C. Similarly, in the above embodiment, the lower wall portion 20L of the rocker 20 and the lower flange portion 24C are connected to the corner portion 50K where the upper wall portion 50U and the side wall portion 50S2 of the first battery side frame 50 are connected. However, the corners 50K and the corners 20K may be shifted, or the corners 50K of the first battery side frame 50 are omitted so that the corners 50K are chamfered. Also good.

  In the above-described embodiment, the inner portion of the first battery side frame 50 is overlapped with the inner portion 50Ri of the first battery side frame 50 and the outer portion 60Ro of the second battery side frame 60 when viewed from the vehicle vertical direction. 50Ri is inserted between the upper flange portion 64A and the lower flange portion 64B of the second battery side frame 60, but is not limited thereto. For example, the outer part 60Ro of the second battery side frame 60 may be overlapped with the inner part 50Ri of the first battery side frame 50 from below or above in the vehicle vertical direction and coupled to the inner part 50Ri.

  Furthermore, in the above embodiment, the second battery side frame 60 of the battery frame 34 is attached to the floor panel 16 via the floor under reinforcement 28. For example, the second battery side frame 60 is attached to the floor panel 16 via a bracket. May be attached. The second battery side frame 60 may be attached to the floor panel 16 as necessary, and the second battery side frame 60 is not necessarily attached to the floor panel 16. Further, the first battery side frame 50 can be attached to the floor panel 16. Furthermore, the second battery side frame 60 can be omitted as appropriate.

  In the above embodiment, the rocker 20 is provided with the rocker reinforcement 26. However, the rocker reinforcement 26 can be omitted as appropriate.

  As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be appropriately combined and the gist of the present invention may be used. Of course, various embodiments can be implemented without departing from the scope.

10 Vehicle battery mounting structure 16 Floor panel (vehicle floor)
20 Rocker 20Ri Inner portion 20L Lower wall portion 20K Corner portion 22 Rocker outer panel 22A Main body portion 22B Upper flange portion 22C Lower flange portion 24 Rocker inner panel 24A Main body portion 24B Upper flange portion 24C Lower flange portion 32 Battery module 50 First battery Side frame 50Ri inner part 50Ro outer part 50U upper wall part 50S2 side wall part (outer side wall part in vehicle width direction)
50K Corner portion 60 Second battery side frame 62 Frame main body portion 62S2 Side wall portion (outside side wall portion of frame main body portion in vehicle width direction)
64A Upper flange (flange)
64B Lower flange (flange)

Claims (5)

A battery module disposed below the vehicle floor;
A rocker having a closed cross-sectional structure, disposed along an end of the vehicle floor in the vehicle width direction, and extending in the vehicle front-rear direction;
The battery module has a closed cross-sectional structure and is arranged along the vehicle front-rear direction on the outside of the battery module in the vehicle width direction, and the outer portion located outside in the vehicle width direction has a vehicle width in the rocker. A first battery side frame coupled to an inner portion located inside the direction;
A vehicle battery mounting structure comprising: An upper wall part constituting the closed cross-sectional structure of the first battery side frame is overlapped with a lower wall part constituting the closed cross-sectional structure of the rocker from below and coupled to the lower wall part.
The vehicle battery mounting structure according to claim 1. The rocker
A pair of main body portions arranged facing the vehicle width direction and constituting the closed cross-sectional structure;
A pair of upper flange portions extending from the upper ends of the pair of main body portions to the upper side in the vehicle vertical direction and coupled to each other;
A pair of lower flange portions extending from the lower ends of the pair of main body portions to the lower side in the vehicle vertical direction and coupled to each other;
Have
The outer side wall portion of the first battery side frame in the vehicle width direction is in contact with the pair of lower flange portions from the inner side in the vehicle width direction.
The vehicle battery mounting structure according to claim 2. A corner portion where the upper wall portion and the side wall portion in the first battery side frame are connected to a corner portion where the lower wall portion and the lower flange portion of the rocker are connected.
The vehicle battery mounting structure according to claim 3. A frame main body portion having a closed cross-sectional structure, and a pair of flange portions extending from the outer side wall portion of the frame main body portion in the vehicle width direction to the outer side in the vehicle width direction and facing each other in the vehicle vertical direction A second battery side frame disposed between the first battery side frame and the battery module along the vehicle front-rear direction and attached to the vehicle floor;
Inner portions located on the inner side in the vehicle width direction of the first battery side frame are inserted between the pair of flange portions and are respectively coupled to the flange portions.
The vehicle battery mounting structure according to any one of claims 1 to 4.

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