Battery pack mounting structure

Abstract

To provide a battery pack mounting structure that enables multiple highly versatile battery packs to be mounted on a vehicle while reducing the number of components and saving space.SOLUTION: A central frame 120 extending in the vehicle width direction is provided between battery packs 10 arranged adjacent to each other in the front-rear direction of a vehicle, and side frames 110L, 110R extending in the front-rear direction are provided on at least one side in the vehicle width direction. A central frame 120 has a hollow shape, and a bus bar unit 140 that electrically connects the battery packs 10 is housed inside the central frame 120. The battery pack 10 is fixed to the central frame 120 and the side frames 110L, 110R, and the central frame 120 and the side frames 110L, 110R are fixed to the vehicle.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a vehicle mounting structure for a battery pack. [Background technology]

[0002] In recent years, research and development into secondary batteries that contribute to energy efficiency has been conducted in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] Conventional electric vehicles and hybrid vehicles are generally equipped with one battery pack in which multiple battery modules are housed in a battery case. For example, Patent Document 1 proposes a battery pack including multiple modules, a waveguide disposed between the opposing modules, and a battery case that houses them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2023-504158 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in this case, a battery pack needs to be designed for each vehicle, which poses a problem of lack of versatility of the battery pack.

[0006] In addition, in the battery pack described in Patent Document 1, the waveguide is provided on the bottom surface so as to cross the central region of the pack case. The waveguide is fixedly coupled to the inner wall, which prevents the pack from being deformed by an external impact, but does not contribute to fixing the battery pack to the vehicle. Therefore, a separate structure for fixing the battery pack to the vehicle was required.

[0007] The present invention provides a vehicle-mounting structure for a battery pack that can mount a plurality of highly versatile battery packs in a vehicle while reducing the number of parts and saving space, thereby contributing to energy efficiency. [Means for solving the problem]

[0008] The present invention relates to a first battery pack and a second battery pack that house a cell stack in which a plurality of battery cells are stacked, and that are disposed adjacent to each other in a front-rear direction of the vehicle; a central frame disposed between the first battery pack and the second battery pack and extending in a vehicle width direction; A vehicle mounting structure for a battery pack, comprising: a side frame disposed on at least one side of the first battery pack and the second battery pack in the vehicle width direction and extending in the front-rear direction, The central frame has a hollow shape, a conductive member that electrically connects the first battery pack and the second battery pack is housed inside the central frame; the first battery pack and the second battery pack are fixed to the central frame and the side frames, The central frame and the side frames are fixed to the vehicle. Effect of the Invention

[0009] According to the present invention, it is possible to mount a plurality of highly versatile battery packs in a vehicle while reducing the number of parts and saving space. [Brief description of the drawings]

[0010] [Figure 1] 1 is an external perspective view of a battery pack 10. FIG. [Diagram 2] FIG. 2 is an exploded perspective view of the battery pack 10. [Diagram 3] FIG. 2 is an exploded perspective view of the cell stack 30. [Figure 4] FIG. 2 is a plan view of the battery pack 10. [Diagram 5] FIG. 2 is an external perspective view of the battery assembly 100. [Figure 6] 6 is a cross-sectional view taken along line AA in FIG. 5. [Figure 7] 1 is an external perspective view of the battery assembly 100 seen from the bottom side with the bottom cover 126 disassembled. FIG. [Figure 8] FIG. 2 is an external perspective view of a central frame 120. [Figure 9] 1 is an external perspective view of a central frame 120 seen from the bottom side with a bottom cover 126 disassembled. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the battery pack of the present invention will be described with reference to the accompanying drawings. For convenience, the following description will be given using a coordinate system consisting of a front-rear direction, a left-right direction, and an up-down direction that are mutually orthogonal. In the drawings, the front is indicated as Fr, the rear as Rr, the left side as L, the right side as R, the upside as U, and the downside as D. However, these directions are unrelated to the direction in which the battery pack is mounted on the device. For example, when the battery pack is mounted on a vehicle, the up-down direction of the battery pack may face the traveling direction of the vehicle when mounted on the vehicle, or may face the vehicle width direction.

[0012] [Battery pack] As shown in Fig. 1 and Fig. 2, the battery pack 10 has two cell stacks 30 arranged side by side in the front-rear direction inside a box-shaped case 20. As shown in Fig. 3, the cell stack 30 has a plurality of rectangular battery cells 40 stacked in the left-right direction and an end plate 31 arranged on one side in the left-right direction (the left side in this embodiment), which are temporarily fixed with a predetermined pressure by using a binder 50. Note that a separator (not shown) may be arranged between adjacent battery cells 40. The binder 50 includes a rectangular lower restraint portion 51 surrounding the bottom surface of the cell stack 30, a rectangular upper restraint portion 52 surrounding the top surface of the cell stack 30, and a pair of side restraint portions 53 that sandwich the cell stack 30 from the front-rear direction, and the lower restraint portion 51 and the pair of side restraint portions 53 are integrally formed. Note that another end plate, separator, etc. may be arranged on the other side in the left-right direction of the cell stack 30 (the right side in this embodiment) so that the battery cells 40 on the other side do not directly contact the case 20. Furthermore, the cell stack 30 does not have to be configured in such a way that the multiple battery cells 40 are restrained by the binder 50;

[0013] The battery cell 40 is, for example, a secondary battery such as a lithium ion battery. A pair of terminal portions 42 and a safety valve 44 disposed between the pair of terminal portions 42 are provided on the upper surface of the battery cell 40. The pair of terminal portions 42 include a positive terminal and a negative terminal, and for example, the positive terminal is connected to the negative terminal of the adjacent battery cell 40 via a bus bar (not shown) and the negative terminal is connected to the positive terminal of the adjacent battery cell 40 via a bus bar (not shown), thereby electrically connecting the multiple battery cells 40 in series. For example, in order to shorten the length of the bus bar, the multiple battery cells 40 may be stacked so that the front-rear direction is alternately reversed.

[0014] The safety valve 44 is a burst type valve that prevents the outer can from bursting when the internal pressure of the battery cell 40 increases abnormally. When the internal pressure of the battery cell 40 increases abnormally, the safety valve 44 bursts and the gas inside the battery cell 40 is released to the outside. By providing the safety valve 44 at the center in the front-to-rear direction of the battery cell 40, the battery cells 40 can be gathered in the same front-to-rear position even if they are stacked so that their front-to-rear orientations are alternately reversed.

[0015] Returning to Fig. 2, the case 20 includes a case body 21 that is open at the top, and a case cover 23 that covers the opening of the case body 21. The case body 21 has a front wall portion 82 and a rear wall portion 84 that extend in the left-right direction, a left wall portion 86 that connects left ends of the front wall portion 82 and the rear wall portion 84, a right wall portion 87 that connects right ends of the front wall portion 82 and the rear wall portion 84, and a bottom wall portion 88. The space surrounded by the front wall portion 82, the rear wall portion 84, the left wall portion 86, and the right wall portion 87 constitutes a cell accommodating space 25 that accommodates the cell stack 30.

[0016] The left wall 86 has an opening 86a that communicates the cell accommodating space 25 with the outside, and the pressure plate 28 is attached via a sealant 16 (e.g., a rubber seal). By fixing the pressure plate 28 to the left wall 86, the pressure plate 28 comes into contact with the end plates 31 of each cell stack 30 through the opening 86a. By the pressure plate 28 pressing the end plates 31 inward, the cell stack 30 temporarily fixed at a predetermined pressure by the binder 50 is further pressurized in the stacking direction and held within the case 20. The pressure plate 28 may be fixed to the left wall 86 by welding such as friction stir welding, or may be fixed with bolts.

[0017] 1, the pressure plate 28 is provided with two pressure release valves 13 that communicate with the cell accommodating space 25. The pressure release valves 13 open when gas generated from a safety valve 44 of a battery cell 40 causes an abnormal increase in the internal pressure of the cell accommodating space 25, and release the gas inside the case 20 to the outside.

[0018] The left wall 86 and the right wall 87 have protrusions 26 extending in the front-rear direction on their outer surfaces below the intermediate portion in the height direction of the battery pack 10, for example, near the bottom surface, which protrude in a direction away from the battery pack 10. The bottom surface of the protrusions 26 is one step higher than the bottom surface of the battery pack 10. In this embodiment, the bottom surface of the protrusions 26 is one step higher than the bottom surface of the battery pack 10, but it may be at the same height as the bottom surface of the battery pack 10 and form part of the bottom surface of the battery pack 10.

[0019] Further, in front of and to the left of the front wall 82, a bulging portion 22 is formed so as to protrude further forward from the front wall 82. A space is formed inside the bulging portion 22, and a first opening 91 is provided on the front surface, and a second opening 92 is also provided on the upper surface. A terminal block 60 to which the output conductive member 70 is connected is provided in the internal space of the bulging portion 22, forming the output terminal accommodating space 27. In the terminal block 60, a terminal portion (output terminal) of the output conductive member 61 extending from the cell accommodating space 25 to the output terminal accommodating space 27 is electrically connected to a terminal portion of the output conductive member 70 entering the output terminal accommodating space 27 from the first opening 91. The output conductive member 61 includes a positive side bus bar 62 and a negative side bus bar 63 extending from the positive side output terminal and the negative side output terminal of the two cell stacks 30 electrically connected in series, respectively. The output conductive member 70 includes a positive bus bar 72 and a negative bus bar 73 that are connected to an external positive terminal and a negative terminal, respectively.

[0020] 4, the first opening 91 is provided so as to be offset in the left-right direction with respect to a center line L in the left-right direction of the battery pack 10. That is, the center line L1 of the first opening 91 is provided so as to be offset in the left-right direction with respect to the center line L in the left-right direction of the battery pack 10.

[0021] The terminal block 60 is also provided so as to be oriented in the left-right direction with respect to the center line L in the left-right direction of the battery pack 10. In other words, the center line L2 of the terminal block 60 is provided so as to be offset in the left-right direction with respect to the center line L of the battery pack 10 in the left-right direction.

[0022] The terminal portion of the output conductive member 61 and the terminal portion of the output conductive member 70 are preferably fastened with bolts. By using bolts, the terminal portions of the output conductive member 61 and the output conductive member 70 may be round (R-shaped) or open-ended (Y-shaped). In this manner, by connecting the output conductive member 70 from the first opening 91 of the output terminal accommodating space 27, the battery pack 10 can be mounted on various devices.

[0023] Thus, the inside of the case 20 is provided with a cell accommodating space 25 that accommodates the two cell stacks 30, and an output terminal accommodating space 27 that is disposed in front of and to the left of the cell accommodating space 25 and to which the output conductive member 70 is connected. The number of cell stacks 30 accommodated in the cell accommodating space 25 may be one, or three or more.

[0024] In the front wall portion 82, a region separating the cell accommodating space 25 and the output terminal accommodating space 27 (hereinafter, this portion is referred to as a partition portion 85) is lower in height than other regions. The positive side bus bar 62 and the negative side bus bar 63 extend from above the partition portion 85 into the output terminal accommodating space 27, and are fixed to a terminal block 60 provided in the output terminal accommodating space 27.

[0025] 1, a signal line connector 67 is provided in the output terminal accommodating space 27. A signal line is connected to the signal line connector 67 via a through hole provided in the partition wall portion 85 that connects the cell accommodating space 25 and the output terminal accommodating space 27.

[0026] As shown in FIG. 2, the case cover 23 is attached to the upper surface of the case 20, excluding the partition wall portion 85, via a first seal material 11 (e.g., a rubber seal). The case cover 23 is fixed to the upper surface of the case 20 by welding, for example, friction stir welding or the like. A second seal material 12 (e.g., a foam seal) is provided in the gap between the partition wall portion 85 and the case cover 23, and the cell accommodating space 25 is sealed from the outside by the first seal material 11 and the second seal material 12. By sealing the cell accommodating space 25 from the outside, intrusion of foreign matter into the cell accommodating space 25 is suppressed, and deterioration of the battery cells 40 can be suppressed. Note that it is preferable that a seal material such as a foam seal is also provided in the gap between the through hole provided in the partition wall portion 85 and the signal line.

[0027] The battery pack 10 configured in this manner does not include auxiliary devices such as a junction box that houses a contactor, a fuse, etc., and an ECU. Therefore, when the battery pack 10 is used alone, a junction box and / or an ECU may be connected to the battery pack 10. When a plurality of battery packs 10 are used, the battery packs 10 may be electrically connected to each other through a connection box, and the junction box and / or an ECU may be connected to the connection box. Also, the junction box and / or an ECU may be built into the connection box, and the plurality of battery packs 10 may be connected to the junction box and / or the ECU within the connection box.

[0028] Next, a battery pack mounting structure in which four battery packs 10 are mounted under the floor of a vehicle will be described with reference to Figures 5 to 9. In the following description, the front-rear direction, left-right direction (vehicle width direction), and up-down direction are defined based on the vehicle.

[0029] In this mounting structure, as shown in Fig. 5, a central frame 120 extending in the vehicle width direction is fixed between a left side frame 110L and a right side frame 110R extending in the front-rear direction of the vehicle. In addition, the two battery packs 10 described above are arranged side by side on the left and right in the space in front of the central frame 120, and the two battery packs 10 described above are arranged side by side on the left and right in the space behind the central frame 120. Hereinafter, this structure is referred to as a battery assembly 100.

[0030] [Battery Assembly] The two front battery packs 10 are arranged so that the bulging portions 22 are located rearward and to the right, and the two rear battery packs 10 are arranged so that the bulging portions 22 are located forward and to the left. That is, the two front battery packs 10 and the two rear battery packs 10 are arranged in a state rotated 180° so that the bulging portions 22 face each other in the front-rear direction with the central frame 120 in between.

[0031] As shown in Figures 8 and 9, the central frame 120 of the battery assembly 100 is a hollow body with a rectangular cross-section, and is fastened to the left side frame 110L and the right side frame 110R by flange portions 127 extending in the front-to-rear direction formed on the left and right ends.

[0032] Two front communication holes 121a are formed in the front surface 121 of the central frame 120, each of which communicates with a first opening 91 formed in the bulging portion 22 of the front battery pack 10. Similarly, two rear communication holes 122a are formed in the rear surface 122 of the central frame 120, each of which communicates with a first opening 91 formed in the bulging portion 22 of the rear battery pack 10. The front communication holes 121a and the rear communication holes 122a are offset in the vehicle width direction. That is, the center position of the front communication hole 121a in the vehicle width direction and the center position of the rear communication hole 122a in the vehicle width direction are offset in the vehicle width direction.

[0033] Fastening portions 123 for fastening the corresponding battery packs 10 in a liquid-tight manner are provided around the front communication holes 121a and the rear communication holes 122a, and each battery pack 10 is fixed to the central frame 120 by, for example, bolt fastening. As shown in Fig. 8, the central frame 120 has fastening portions 123 on the front surface 121 and the rear surface 122, respectively, and the front surface 121 and the rear surface 122 protrude upward and downward, so that a cross section cut in the front-to-rear direction has a highly rigid cross-sectional shape like an H-shaped steel beam.

[0034] From the output terminal accommodating space 27 formed in the bulging portion 22 of each battery pack 10, the conductive member 70 enters the hollow region 125 of the central frame 120 through the first opening 91. As described above, the first opening 91 of the battery pack is offset in the left-right direction with respect to the center line L. Therefore, when the bulging portions 22 are rotated 180 degrees to face each other in the front-rear direction with the central frame 120 in between, the first opening 91 of the front battery pack 10 and the first opening 91 of the rear battery pack 10 are offset in the vehicle width direction. As a result, the front communication hole 121a with which the first opening 91 of the front battery pack 10 communicates and the rear communication hole 122a with which the first opening 91 of the rear battery pack 10 communicates are offset in the vehicle width direction. Therefore, a fastening space for the conductive member 70 can be secured.

[0035] Similarly, since the terminal block 60 of the battery pack is offset in the left-right direction with respect to the center line L, the terminal block 60 of the front battery pack 10 and the terminal block 60 of the rear battery pack 10 are offset in the left-right direction. As a result, the output conductive member 70 that passes from the terminal block 60 of the front battery pack 10 through the front communication hole 121a to be connected to the bus bar unit 140 and the output conductive member 70 that passes from the terminal block 60 of the rear battery pack 10 through the rear communication hole 122a to be connected to the bus bar unit 140 are offset in the vehicle width direction. Therefore, the output conductive member 70 extending from the front battery pack 10 and the output conductive member 70 extending from the rear battery pack 10 do not interfere with each other in the hollow region 125 of the central frame 120.

[0036] A busbar unit 140 is disposed in the hollow region 125 of the central frame 120 as shown in Fig. 7. The busbar unit 140 includes, for example, a plurality of connecting busbars, and electrically connects the four battery packs 10 in series as shown by the arrows in Fig. 9. The central frame 120 is an example of the above-mentioned connection box.

[0037] A bottom opening 124 is provided on the rear surface of the central frame 120, and the bottom opening 124 is liquid-tightly closed by a bottom cover 126 via a seal member 14 (see FIG. 9). Since the bottom opening 124 of the central frame 120 is liquid-tightly closed by the bottom cover 126 and the communication holes 121a, 122a of the central frame 120 and the first opening 91 of each battery pack 10 are liquid-tightly fastened to each other, intrusion of moisture from the outside into the output terminal accommodating space 27 of the battery pack 10 and the internal space of the central frame 120 is restricted. The output conductive member 70 extending from each battery pack 10 to the hollow region 125 of the central frame 120 is fastened to the bus bar unit 140 from the bottom opening 124 with the bottom cover 126 removed.

[0038] As shown in FIG. 6, the left side frame 110L has a pack holding portion 112 extending in the front-rear direction at the inner lower end thereof, and holds the battery pack 10. More specifically, as described above, on the left and right side surfaces of the battery pack 10 (case 20), protruding portions 26 are provided extending in the front-rear direction, protruding downward from the middle portion of the battery pack 10 in the height direction and in a direction away from the battery pack 10, and the bottom surface of the protruding portion 26 is fixed to the pack holding portion 112 of the left side frame 110L. The same is true for the right side frame 110R, and the bottom surface of the protruding portion 26 is fixed to the pack holding portion 112 of the right side frame 110R. In this manner, the bottom surface of each battery pack 10 is fixed to the left side frame 110L or the right side frame 110R.

[0039] The left battery pack 10 and the right battery pack 10 abut against each other at their protruding portions 26, and the bottom surfaces of the protruding portions 26 are fixed to a plate-shaped bracket 130 extending from below in the front-rear direction of the vehicle. This causes the left and right battery packs 10 to be fixed to each other.

[0040] In this way, the left battery pack 10 and the right battery pack 10 abut against each other at the protruding parts 26 provided below the middle part in the height direction of the battery packs 10, so that in the event of a side collision of the vehicle, the protruding parts 26 abut against each other and deform to become convex downward. This makes it possible to suppress deformation of the floor panel of the vehicle toward the passenger compartment.

[0041] When the height of the protrusion 26 is the same as the height of the bottom surface of the battery pack 10, or when the battery pack 10 is not provided with the protrusion 26, it is preferable that the bottom surface of the battery pack 10 is fixed to the left side frame 110L or the right side frame 110R. It is also preferable that the left battery pack 10 and the right battery pack 10 abut each other at their side surfaces, and that their bottom surfaces are fixed to a plate-shaped bracket 130 extending from below in the front-rear direction of the vehicle.

[0042] The battery assembly 100 thus configured is fixed to a frame member of the vehicle by a pair of central support parts 128 protruding upward and provided on the central frame 120 shown in Fig. 8, and side support parts 111 provided on the left side frame 110L and the right side frame 110R shown in Fig. 5, and is disposed under the floor of the vehicle. More specifically, the pair of central support parts 128 provided on the central frame 120 are fixed below a floor frame extending in the vehicle width direction, and the side support parts 111 provided on the left side frame 110L and the right side frame 110R are fixed below a pair of side frames extending in the front-rear direction of the vehicle.

[0043] As described above, the central frame 120 has the bus bar unit 140 arranged in the internal hollow area 125, which electrically connects the four battery packs 10. In other words, in the battery assembly 100, a member in which the bus bar unit 140 that electrically connects the battery packs 10 to each other is arranged functions as the central frame 120, and the battery assembly 100 is fixed to the vehicle via the central frame 120 and the side frames 110L and 110R. This allows a number of highly versatile battery packs 10 to be mounted on the vehicle while reducing the number of parts and saving space.

[0044] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0045] For example, in the above embodiment, the battery assembly 100 is composed of four battery packs 10, two on each of the front, rear, left and right sides, but this is not limited to this, and the battery assembly 100 may be composed of one on each of the front and rear sides, for a total of two battery packs 10, or two or more battery packs 10 may be arranged on the front and rear sides and two or more on the left and right sides.

[0046] Furthermore, the battery pack 10 may be provided with a water jacket either integrally with the bottom wall portion 88 or separately.

[0047] This specification describes at least the following items. Note that, in parentheses, components corresponding to those in the above-mentioned embodiment are shown, but the present invention is not limited to these.

[0048] (1) A first battery pack (battery pack 10) and a second battery pack (battery pack 10) that house a cell stack (cell stack 30) in which a plurality of battery cells (battery cells 40) are stacked, and that are arranged adjacent to each other in the front-rear direction of the vehicle; a central frame (central frame 120) disposed between the first battery pack and the second battery pack and extending in a vehicle width direction; A vehicle mounting structure for a battery pack, comprising: side frames (left side frame 110L, right side frame 110R) disposed on at least one side of the first battery pack and the second battery pack in the vehicle width direction and extending in the front-rear direction, The central frame has a hollow shape, A conductive member (bus bar unit 140) that electrically connects the first battery pack and the second battery pack is housed inside the central frame, the first battery pack and the second battery pack are fixed to the central frame and the side frames, The central frame and the side frames are fixed to the vehicle. Battery pack mounting structure for vehicle.

[0049] According to (1), a component on which conductive members electrically connecting the first battery pack and the second battery pack are arranged functions as a central frame component, and multiple battery packs are fixed to the vehicle via the central frame component and the side frames, thereby reducing the number of parts and saving space while enabling multiple highly versatile battery packs to be mounted on the vehicle.

[0050] (2) A vehicle mounting structure for a battery pack according to (1), a third battery pack (battery pack 10) that houses a cell stack (cell stack 30) in which a plurality of battery cells (battery cells 40) are stacked, and that is disposed adjacent to the first battery pack in the vehicle width direction; a bracket (bracket 130) disposed between the first battery pack and the third battery pack and extending in the front-rear direction; The first battery pack and the third battery pack have protrusions (protrusions 26) that protrude toward each other on opposing surfaces, the protruding portion is provided below a middle portion of the first battery pack and the third battery pack in a height direction, A bottom surface of the protrusion is fixed to the bracket. Battery pack mounting structure for vehicle.

[0051] According to (2), when a side collision of the vehicle occurs, the protruding portions come into contact with each other and deform to become convex downward, thereby preventing the floor panel from deforming toward the passenger compartment.

[0052] (3) A vehicle mounting structure for a battery pack according to (1) or (2), The side frame is fixed to a bottom surface of the first battery pack and the second battery pack. Battery pack mounting structure for vehicle.

[0053] According to (3), the load input during a side collision of the vehicle can be prevented from being input to the battery cell.

[0054] (4) A vehicle mounting structure for a battery pack according to (2), The side frame is fixed to bottom surfaces of the protruding portions of the first battery pack and the second battery pack. Battery pack mounting structure for vehicle.

[0055] According to (4), the load input during a side collision of the vehicle can be prevented from being input to the battery cell.

[0056] (5) A vehicle mounting structure for a battery pack according to any one of (1) to (4), the central frame and the first battery pack have a first communication hole (a first opening 91, a front communication hole 121a) that communicates with each other, the central frame and the second battery pack have second communication holes (first opening 91, rear communication hole 122a) that communicate with each other, The first communication hole and the second communication hole are offset in the vehicle width direction. Battery pack mounting structure for vehicle.

[0057] According to (5), a fastening space can be secured between an extracting conductive member extending from the terminal block of the first battery pack and connected to a conductive member, and an extracting conductive member extending from the terminal block of the second battery pack and connected to a conductive member.

[0058] (6) A vehicle mounting structure for a battery pack according to any one of (1) to (5), The central frame has a bottom opening (bottom opening 124) on the bottom surface, The bottom opening is sealed with a lid member (bottom cover 126) via a seal member (seal member 14). Battery pack mounting structure for vehicle.

[0059] According to (6), the connection work can be performed through the bottom opening and water infiltration into the central frame can be prevented.

[0060] (7) A vehicle mounting structure for a battery pack according to any one of (1) to (6), the central frame and the first battery pack have a first communication hole (a first opening 91, a front communication hole 121a) that communicates with each other, the central frame and the second battery pack have second communication holes (first opening 91, rear communication hole 122a) that communicate with each other, The terminal block (terminal block 60) of the first battery pack and the terminal block (terminal block 60) of the second battery pack are offset in the vehicle width direction. Battery pack mounting structure for vehicle.

[0061] According to (7), interference between an extracting conductive member extending from the terminal block of the first battery pack and connected to a conductive member and an extracting conductive member extending from the terminal block of the second battery pack and connected to a conductive member can be suppressed.

[0062] (8) A vehicle mounting structure for a battery pack according to (7), the first battery pack and the second battery pack have the same shape, the terminal blocks of the first battery pack and the second battery pack are offset in the vehicle width direction with respect to center lines of the first battery pack and the second battery pack in the vehicle width direction; Battery pack mounting structure for vehicle.

[0063] According to (8), by arranging battery packs of the same shape facing each other in the front-to-rear direction while rotating them 180 degrees, the position of the terminal block can be offset. [Explanation of symbols]

[0064] 10 Battery packs (1st battery pack, 2nd battery pack, 3rd battery pack) 14 Sealing material 26 Protrusion 30 Cell stack 40 Battery Cells 60 terminal block 91 1st opening (1st communication hole, 2nd communication hole) 120 Center Frame 121a Front communication hole (1st communication hole) 122a Rear communication hole (second communication hole) 124 Bottom opening 126 Bottom cover (lid member) 130 Bracket 140 Busbar unit (conductive material)

Claims

1. a first battery pack and a second battery pack, each of which accommodates a cell stack in which a plurality of battery cells are stacked, and which are disposed adjacent to each other in a front-rear direction of the vehicle; a central frame disposed between the first battery pack and the second battery pack and extending in a vehicle width direction; a side frame disposed on at least one side of the first battery pack and the second battery pack in the vehicle width direction and extending in the front-rear direction, The central frame has a hollow shape, a conductive member that electrically connects the first battery pack and the second battery pack is housed inside the central frame; the first battery pack and the second battery pack are fixed to the central frame and the side frames, The central frame and the side frames are fixed to the vehicle. Battery pack mounting structure for vehicle.

2. 2. The vehicle mounting structure of the battery pack according to claim 1, a third battery pack that houses a cell stack in which a plurality of battery cells are stacked and is disposed adjacent to the first battery pack in the vehicle width direction; a bracket disposed between the first battery pack and the third battery pack and extending in the front-rear direction; the first battery pack and the third battery pack have protruding portions on opposing surfaces thereof, the protruding portions protruding toward each other; the protruding portion is provided below intermediate portions of the first battery pack and the third battery pack in a height direction, A bottom surface of the protrusion is fixed to the bracket. Battery pack mounting structure for vehicle.

3. 3. The vehicle mounting structure of the battery pack according to claim 1, The side frame is fixed to a bottom surface of the first battery pack and the second battery pack. Battery pack mounting structure for vehicle.

4. 3. The vehicle mounting structure of the battery pack according to claim 2, The side frame is fixed to bottom surfaces of the protruding portions of the first battery pack and the second battery pack. Battery pack mounting structure for vehicle.

5. 3. The vehicle mounting structure of the battery pack according to claim 1, the central frame and the first battery pack have a first communication hole communicating with each other; the central frame and the second battery pack have a second communication hole communicating with each other; The first communication hole and the second communication hole are offset in the vehicle width direction. Battery pack mounting structure for vehicle.

6. 6. The vehicle mounting structure of a battery pack according to claim 5, The central frame has a bottom opening on a bottom surface thereof, The bottom opening is sealed with a lid member via a sealing member. Battery pack mounting structure for vehicle.

7. 3. The vehicle mounting structure of the battery pack according to claim 1, the central frame and the first battery pack have a first communication hole communicating with each other; the central frame and the second battery pack have a second communication hole communicating with each other; The terminal block of the first battery pack and the terminal block of the second battery pack are offset in the vehicle width direction. Battery pack mounting structure for vehicle.

8. The vehicle mounting structure of a battery pack according to claim 7, the first battery pack and the second battery pack have the same shape, the terminal blocks of the first battery pack and the second battery pack are offset in the vehicle width direction with respect to center lines of the first battery pack and the second battery pack in the vehicle width direction; Battery pack mounting structure for vehicle.

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