Vehicle-mounted structure of battery pack

Abstract

The invention provides a vehicle-mounted structure of a battery pack, which can reduce the number of components, save space and mount a plurality of battery packs with high versatility on a vehicle. A center frame (120) extending in the vehicle width direction is provided between battery packs (10) disposed adjacent to each other in the front-rear direction of the vehicle, and side frames (110L, 110R) extending in the front-rear direction are provided on at least one side in the vehicle width direction. The central frame (120) has a hollow shape, and a bus bar unit (140) electrically connecting the battery pack (10) is housed inside the central frame (120). The battery pack (10) is fixed to the center frame (120) and the side frames (110L, 110R), and the center frame (120) and the side frames (110L, 110R) are fixed to the vehicle.

Description

Technical Field

[0001] The present invention relates to an on-vehicle structure of a battery pack. Background Art

[0002] In recent years, in order to ensure that more people have access to affordable, reliable, and sustainable modern energy, research and development related to secondary batteries that contribute to energy efficiency improvement have been underway.

[0003] In conventional electric vehicles and hybrid vehicles, a battery pack in which a plurality of battery modules are housed in a battery case is generally mounted. For example, Patent Document 1 proposes a battery pack that includes a plurality of modules, a waveguide disposed between opposing modules, and a battery case that houses them.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-504158 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in this case, it is necessary to design a battery pack for each vehicle, so there is a problem that the battery packs do not have universality.

[0009] 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 battery pack case. Since the waveguide is fixedly coupled to the inner wall, deformation of the battery pack caused by an external impact can be prevented, but it does not contribute to fixing to the vehicle. Therefore, a structure for fixing the battery pack to the vehicle is separately required.

[0010] The present invention provides an on-vehicle structure of a battery pack that can reduce the number of components and save space, and can mount a plurality of battery packs with high universality on a vehicle. Furthermore, it contributes to improving energy efficiency.

[0011] Means for Solving the Problems

[0012] The present invention relates to an on-vehicle structure of a battery pack, comprising:

[0013] a first battery pack and a second battery pack that house a single battery stack formed by stacking a plurality of single batteries and are arranged adjacent to each other in the front-rear direction of the vehicle;

[0014] a center frame that is disposed between the first battery pack and the second battery pack and extends in the vehicle width direction; and

[0015] A side frame, which is disposed on at least one side in the vehicle width direction of the first battery pack and the second battery pack and extends in the front-rear direction, wherein,

[0016] The central frame has a hollow shape,

[0017] A conductive component for electrically connecting the first battery pack and the second battery pack is housed inside the central frame,

[0018] The first battery pack and the second battery pack are fixed to the central frame and the side frame,

[0019] The central frame and the side frame are fixed to the vehicle.

[0020] Advantages of the Invention

[0021] According to the present invention, the number of components can be reduced to save space, and multiple battery packs with high versatility can be mounted on a vehicle. Description of the Drawings

[0022] Figure 1 is an external perspective view of the battery pack 10.

[0023] Figure 2 is an exploded perspective view of the battery pack 10.

[0024] Figure 3 is an exploded perspective view of the single battery laminate 30.

[0025] Figure 4 is a top view of the battery pack 10.

[0026] Figure 5 is an external perspective view of the battery storage assembly 100.

[0027] Figure 6 is Figure 5 a cross-sectional view taken along line A-A of

[0028] Figure 7 is an external perspective view of the battery storage assembly 100 viewed from the bottom side with the bottom cover 126 disassembled.

[0029] Figure 8 is an external perspective view of the central frame 120.

[0030] Figure 9 is an external perspective view of the central frame 120 viewed from the bottom side with the bottom cover 126 disassembled.

[0031] Description of Reference Numerals

[0032] 10 Battery pack (first battery pack, second battery pack, third battery pack)

[0033] 14 Sealing member

[0034] 26 Protrusion

[0035] 30 Single - cell stack

[0036] 40 Single cell

[0037] 60 Terminal block

[0038] 91 First opening (first communication hole, second communication hole)

[0039] 120 Central frame

[0040] 121a Front communication hole (first communication hole)

[0041] 122a Rear communication hole (second communication hole)

[0042] 124 Bottom opening

[0043] 126 Bottom cover (cover member)

[0044] 130 Bracket

[0045] 140 Bus bar unit (conductive member). Detailed implementation mode

[0046] Hereinafter, an embodiment of the battery pack of the present invention will be described based on the drawings. In addition, in the following description, for convenience, a coordinate system composed of the front - rear direction, left - right direction, and up - down direction that are orthogonal to each other will be used for the description. In the drawings, the front is represented as Fr, the rear is represented as Rr, the left side is represented as L, the right side is represented as R, the upper side is represented as U, and the lower side is represented as D. However, these directions have nothing to do with the direction when 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 can be in the traveling direction of the vehicle when mounted, or can be in the vehicle width direction.

[0047] [Battery pack]

[0048] As Figure 1 and Figure 2 shown, in the battery pack 10, two single - cell stacks 30 are arranged side by side in the front - rear direction inside the box - shaped housing 20. As Figure 3As shown, the single-cell stack 30 includes a plurality of square single cells 40 stacked in the left-right direction, and an end plate 31 disposed on one side in the left-right direction (the left side in this embodiment). They are temporarily fixed with a prescribed pressure by using a plate clamp 50. Additionally, a partition (not shown) may be disposed between adjacent single cells 40. The plate clamp 50 includes a rectangular lower restraint portion 51 surrounding the bottom surface of the single-cell stack 30, a rectangular upper restraint portion 52 surrounding the upper surface of the single-cell stack 30, and a pair of side restraint portions 53 sandwiching the single-cell stack 30 in the front-rear direction. The lower restraint portion 51 and the pair of side restraint portions 53 are integrally formed. Additionally, it may be configured such that another end plate, partition, etc. are disposed on the other side in the left-right direction of the single-cell stack 30 (the right side in this embodiment) so that the single cells 40 do not directly contact the housing 20 on the other side. Additionally, the single-cell stack 30 may not be a structure in which a plurality of single cells 40 are restrained by the plate clamp 50, that is, it may be a structure in which a plurality of single cells 40 are directly stacked and disposed inside the housing 20.

[0049] The single 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 single cell 40. The pair of terminal portions 42 includes a positive terminal and a negative terminal. For example, the positive terminal is connected to the negative terminal of an adjacent single cell 40 via a bus bar (not shown), and the negative terminal is connected to the positive terminal of an adjacent single cell 40 via a bus bar (not shown), whereby a plurality of single cells 40 are electrically connected in series. For example, in order to shorten the length of the bus bar, a plurality of single cells 40 may be stacked in a manner of alternately flipping in the front-rear direction.

[0050] The safety valve 44 is a rupture-type valve for preventing the outer can from rupturing when the internal pressure of the single cell 40 abnormally rises. When the internal pressure of the single cell 40 abnormally rises, the safety valve 44 ruptures, and the gas inside the single cell 40 is released to the outside. By disposing the safety valve 44 at the central portion in the front-rear direction of the single cell 40, even when a plurality of single cells 40 are stacked in a manner of alternately flipping in the front-rear direction, they can be collected at the same position in the front-rear direction.

[0051] Return Figure 2 The housing 20 includes a housing main body 21 having an opening at the top and a housing cover 23 covering the opening portion of the housing main body 21. The housing main body 21 has: a front wall portion 82 and a rear wall portion 84 which are extended and provided in the left-right direction; a left wall portion 86 which connects the left end portions of the front wall portion 82 and the rear wall portion 84; a right wall portion 87 which connects the right end portions 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 single-cell accommodation space 25 for accommodating the single-cell stack 30.

[0052] An opening 86a that allows the single-cell accommodation space 25 to communicate with the outside is provided in the left wall portion 86, and a pressure plate 28 is installed with a seal 16 (such as a rubber seal) interposed therebetween. By fixing the pressure plate 28 to the left wall portion 86, the pressure plate 28 contacts the end plate 31 of each single-cell laminate 30 from the opening 86a. The pressure plate 28 presses the end plate 31 inward, whereby the single-cell laminate 30 temporarily fixed with a prescribed pressure by the plate clamp 50 is further pressurized in the stacking direction and held within the housing 20. The fixing of the pressure plate 28 to the left wall portion 86 can be a fixing based on welding such as friction stir welding, or can be a bolt fixing.

[0053] In addition, as Figure 1 shown, two pressure release valves 13 that communicate with the single-cell accommodation space 25 are provided on the pressure plate 28. When the internal pressure of the single-cell accommodation space 25 abnormally rises due to gas generated from the safety valve 44 of the single cell 40, the pressure release valve 13 opens to release the gas within the housing 20 to the outside.

[0054] On the outer surfaces of the left wall portion 86 and the right wall portion 87, a protruding portion 26 that protrudes in a direction away from the battery pack 10 is provided to extend in the front-rear direction below the middle portion in the height direction of the battery pack 10, for example, near the bottom surface. The bottom surface of the protruding portion 26 is one step higher than the bottom surface of the battery pack 10. In addition, in the present embodiment, the bottom surface of the protruding portion 26 is one step higher than the bottom surface of the battery pack 10, but it may also be the same height as the bottom surface of the battery pack 10 and constitute a part of the bottom surface of the battery pack 10.

[0055] In addition, in front of and to the left of the front wall portion 82, a bulging portion 22 is formed to protrude further forward from the front wall portion 82. A space is formed inside the bulging portion 22, 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 for connecting the extraction conductive member 70 is provided in the internal space of the bulging portion 22, constituting an output terminal accommodation space 27. On the terminal block 60, the terminal portion (output terminal) of the output conductive member 61 extending from the single-cell accommodation space 25 to the output terminal accommodation space 27 is electrically connected to the terminal portion of the extraction conductive member 70 that enters the output terminal accommodation 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, and the positive-side bus bar 62 and the negative-side bus bar 63 extend from the positive-side output terminal and the negative-side output terminal of two serially electrically connected single-cell laminates 30, respectively. The extraction conductive member 70 includes a positive-side bus bar 72 and a negative-side bus bar 73, and the positive-side bus bar 72 and the negative-side bus bar 73 are connected to external positive terminals and negative terminals, respectively.

[0056] As Figure 4As shown, the first opening portion 91 is provided to be displaced in the left - right direction with respect to the center line L in the left - right direction of the battery pack 10. That is, the center line L1 of the first opening portion 91 is provided to be displaced in the left - right direction with respect to the center line L in the left - right direction of the battery pack 10.

[0057] In addition, the terminal block 60 is also provided to be displaced in the left - right direction with respect to the center line L in the left - right direction of the battery pack 10. That is, the center line L2 of the terminal block 60 is provided to be displaced in the left - right direction with respect to the center line L in the left - right direction of the battery pack 10.

[0058] The fastening of the terminal portion of the output conductive member 61 and the terminal portion of the extraction conductive member 70 is preferably bolt fastening. By bolt fastening, the terminal portions of the output conductive member 61 and the extraction conductive member 70 can be circular (R - shaped) or front - opening (Y - shaped). In this way, by connecting the extraction conductive member 70 through the first opening portion 91 of the output terminal storage space 27, the battery pack 10 can be mounted on various devices.

[0059] In this way, inside the housing 20, there are provided: a single - cell storage space 25 that stores two single - cell stacked bodies 30; and an output terminal storage space 27 that is disposed in front of and to the left of the single - cell storage space 25 and is connected to the extraction conductive member 70. In addition, the number of the single - cell stacked bodies 30 stored in the single - cell storage space 25 can be one or three or more.

[0060] The height of the region (hereinafter, this portion is referred to as the partition portion 85) in the front wall portion 82 that separates the single - cell storage space 25 from the output terminal storage space 27 is lower than other regions. The positive - side bus bar 62 and the negative - side bus bar 63 extend from above the partition portion 85 to the output terminal storage space 27 and are fixed to the terminal block 60 provided in the output terminal storage space 27.

[0061] In addition, as Figure 1 shown, a signal - line connector 67 is provided in the output terminal storage space 27. The signal - line connector 67 is connected to the signal line via a through - hole provided in the partition portion 85 that communicates the single - cell storage space 25 with the output terminal storage space 27.

[0062] As Figure 2As shown, a case cover 23 is mounted on the upper surface of the case 20 except for the partition portion 85 with a first seal 11 (such as a rubber seal) interposed therebetween. The case cover 23 is fixed to the upper surface of the case 20 by welding such as friction stir welding. A second seal 12 (such as a foamed seal) is provided in the gap between the partition portion 85 and the case cover 23, and the single cell accommodation space 25 is sealed from the outside by the first seal 11 and the second seal 12. By sealing the single cell accommodation space 25 from the outside, entry of foreign matter into the single cell accommodation space 25 can be suppressed, and deterioration of the single cell 40 can be suppressed. In addition, it is preferable to provide a seal such as a foamed seal also in the gap between the through hole provided in the partition portion 85 and the signal line.

[0063] The battery pack 10 configured in this way does not include auxiliary devices such as a junction box for accommodating contactors, fuses, etc., and an ECU. Therefore, in the case of using the battery pack 10 alone, the junction box and / or the ECU can be connected to the battery pack 10. In addition, in the case of using a plurality of battery packs 10, the battery packs 10 can be electrically connected to each other through a distribution box, and the junction box and / or the ECU can be connected to the distribution box. In addition, the junction box and / or the ECU can be incorporated in the distribution box, and a plurality of battery packs 10 can be connected to the junction box and / or the ECU in the distribution box.

[0064] Next, with reference to Figures 5 to 9 , the mounting structure of the battery packs 10 with four battery packs 10 mounted under the floor of the vehicle will be described. In the following description, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined based on the vehicle.

[0065] In this mounting structure, as Figure 5 shown, a center frame 120 extending in the vehicle width direction is fixed between a left frame 110L and a right frame 110R extending in the front-rear direction of the vehicle. In addition, in the space in front of the center frame 120, the above-described two battery packs 10 are arranged side by side in the left-right direction, and in the space behind the center frame 120, the above-described two battery packs 10 are arranged side by side in the left-right direction. Hereinafter, this structure will be referred to as a battery pack assembly 100.

[0066] [Battery Pack Assembly]

[0067] The two battery packs 10 in the front are arranged such that the bulging portion 22 is located at the rear and to the right, and the two battery packs 10 in the rear are arranged such that the bulging portion 22 is located at the front and to the left. That is, the two battery packs 10 in the front and the two battery packs 10 in the rear are arranged in a state rotated by 180° so that the bulging portions 22 face each other in the front-rear direction with the center frame 120 interposed therebetween.

[0068] As Figure 8 and Figure 9As shown, the central frame 120 of the battery assembly 100 is a hollow body with a rectangular cross-section, and is fastened to the left frame 110L and the right frame 110R by flange portions 127 formed at the left and right ends and extending in the front-rear direction.

[0069] Two front communication holes 121a are formed on the front surface 121 of the central frame 120, and are respectively communicated with the first opening portions 91 of the bulging portions 22 of the battery packs 10 formed in the front. Similarly, two rear communication holes 122a are formed on the rear surface 122 of the central frame 120, and are respectively communicated with the first opening portions 91 of the bulging portions 22 of the battery packs 10 formed in the rear. The front communication holes 121a and the rear communication holes 122a are displaced in the vehicle width direction. That is, the center positions of the front communication holes 121a in the vehicle width direction and the center positions of the rear communication holes 122a in the vehicle width direction are displaced in the vehicle width direction.

[0070] Fastening portions 123 for liquid-tightly fastening the corresponding battery packs 10 are respectively provided around the front communication holes 121a and the rear communication holes 122a. For example, each battery pack 10 is fixed to the central frame 120 by bolt fastening. As Figure 8 shown, 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 it has a high-rigidity cross-sectional shape like an H-beam in the cross-section cut along the front-rear direction.

[0071] The extraction conductive member 70 enters the hollow region 125 of the central frame 120 from the output terminal accommodation space 27 formed in the bulging portion 22 of each battery pack 10 through the first opening portion 91. As described above, since the first opening portions 91 of the battery packs are displaced in the left-right direction with respect to the center line L, when the bulging portions 22 are arranged to rotate 180° in a manner of facing each other in the front-rear direction with the central frame 120 interposed therebetween, the first opening portions 91 of the front battery packs 10 and the first opening portions 91 of the rear battery packs 10 are displaced in the vehicle width direction. Thereby, the front communication holes 121a communicated with the first opening portions 91 of the front battery packs 10 and the rear communication holes 122a communicated with the first opening portions 91 of the rear battery packs 10 are displaced in the vehicle width direction. Therefore, a fastening space for the extraction conductive member 70 can be ensured.

[0072] Similarly, since the terminal block 60 of the battery pack is displaced 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 displaced in the left-right direction. As a result, the extraction conductive member 70 connected to the bus bar unit 140 through the front communication hole 121a from the terminal block 60 of the front battery pack 10 and the extraction conductive member 70 connected to the bus bar unit 140 through the rear communication hole 122a from the terminal block 60 of the rear battery pack 10 are displaced in the vehicle width direction. Therefore, the extraction conductive member 70 extending from the front battery pack 10 and the extraction conductive member 70 extending from the rear battery pack 10 do not interfere with each other in the hollow region 125 of the center frame 120.

[0073] As Figure 7 shown, a bus bar unit 140 is disposed in the hollow region 125 of the center frame 120. The bus bar unit 140 includes, for example, a plurality of connecting bus bars, and as Figure 9 indicated by the arrow, electrically connects the four battery packs 10 in series. The center frame 120 is an example of the above-mentioned distribution box.

[0074] A bottom surface opening 124 is provided on the back surface of the center frame 120, and the bottom surface opening 124 is liquid-tightly closed by a bottom surface cover 126 with a sealing member 14 interposed therebetween (see Figure 9 ). Since the bottom surface opening 124 of the center frame 120 is liquid-tightly closed by the bottom surface cover 126, and the communication holes 121a and 122a of the center frame 120 are liquid-tightly fastened to the first openings 91 of the respective battery packs 10, moisture entry from the outside into the output terminal accommodation space 27 of the battery pack 10 and the internal space of the center frame 120 is restricted. In a state where the bottom surface cover 126 is removed, the extraction conductive member 70 extending from each battery pack 10 to the hollow region 125 of the center frame 120 is fastened to the bus bar unit 140 from the bottom surface opening 124.

[0075] As Figure 6 shown, a battery pack holding portion 112 extending in the front-rear direction is provided at the inner lower end portion of the left frame 110L for holding the battery pack 10. More specifically, as described above, on the left and right side surfaces of the battery pack 10 (the housing 20), a protruding portion 26 protruding in a direction away from the battery pack 10 is provided at a position below the middle portion in the height direction of the battery pack 10 and extending in the front-rear direction, and the bottom surface of the protruding portion 26 is fixed to the battery pack holding portion 112 of the left frame 110L. In addition, the same applies to the right frame 110R, and the bottom surface of the protruding portion 26 is fixed to the battery pack holding portion 112 of the right frame 110R. In this way, the bottom surface of each battery pack 10 is fixed to the left frame 110L or the right frame 110R.

[0076] The protrusions 26 of the battery pack 10 on the left and the battery pack 10 on the right abut against each other, and the bottom surfaces of the protrusions 26 of each other are fixed to a plate-shaped bracket 130 extending in the front-rear direction of the vehicle from below. Thus, the left and right battery packs 10 are fixed to each other.

[0077] In this way, since the protrusions 26 provided on the battery pack 10 on the left and the battery pack 10 on the right, which are located below the middle part in the height direction of the battery pack 10, abut against each other, when a side collision of the vehicle occurs, the protrusions 26 are deformed in a manner of protruding downward while being in contact with each other. Thus, it is possible to suppress the deformation of the vehicle floor toward the passenger compartment side.

[0078] In addition, 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, the bottom surface of the battery pack 10 is preferably fixed to the left frame 110L or the right frame 110R. Additionally, the battery pack 10 on the left and the battery pack 10 on the right preferably abut against each other on the side, and the bottom surfaces of each other are fixed to a plate-shaped bracket 130 extending in the front-rear direction of the vehicle from below.

[0079] The battery assembly 100 configured in this way is fixed to the vehicle frame members by a pair of central support portions 128 protruding upward provided on the central frame 120 as shown in Figure 8 and side support portions 111 provided on the left frame 110L and the right frame 110R as shown in Figure 5 and is disposed under the vehicle floor. More specifically, a pair of central support portions 128 provided on the central frame 120 are fixed below a floor frame extending in the vehicle width direction, and the side support portions 111 provided on the left frame 110L and the right frame 110R are fixed below a pair of side frames extending in the front-rear direction of the vehicle.

[0080] As described above, a bus bar unit 140 for electrically connecting the four battery packs 10 is disposed in the internal hollow region 125 of the central frame 120. In other words, in the battery assembly 100, a component having the bus bar unit 140 for electrically connecting the battery packs 10 to each other 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, 110R. Thus, it is possible to reduce the number of components and save space, and it is possible to mount a plurality of battery packs 10 with high versatility on the vehicle.

[0081] As described above, various embodiments have been described with reference to the accompanying drawings, but the present invention is of course not limited to this example. Those skilled in the art should understand that various modification examples or correction examples can obviously be conceived within the scope described in the technical solution, and these modification examples or correction examples also of course belong to the technical scope of the present invention. In addition, within the scope not departing from the gist of the invention, the constituent elements in the above embodiments can be arbitrarily combined.

[0082] For example, in the above-described embodiment, the battery assembly 100 is composed of two battery packs 10 each in the front, rear, left, and right directions, for a total of four battery packs 10, but it is not limited thereto. It can also be composed of one battery pack 10 each in the front and rear, for a total of two battery packs 10, or two or more battery packs 10 in the front and rear and two or more battery packs 10 in the left and right can be arranged.

[0083] In addition, in the battery pack 10, a water jacket can be integrally or separately provided on the bottom wall portion 88.

[0084] At least the following matters are described in this specification. In addition, although the corresponding constituent elements, etc. in the above embodiments are shown in parentheses, the present invention is not limited thereto.

[0085] (1) A vehicle-mounted structure for a battery pack, comprising:

[0086] A first battery pack (battery pack 10) and a second battery pack (battery pack 10), which house a single battery laminate (single battery laminate 30) formed by laminating a plurality of single batteries (single batteries 40), and are arranged adjacent to each other in the front-rear direction of the vehicle;

[0087] A central frame (central frame 120), which is arranged between the first battery pack and the second battery pack and extends in the vehicle width direction; and

[0088] Side frames (left side frame 110L, right side frame 110R), which are arranged on at least one side in the vehicle width direction of the first battery pack and the second battery pack and extend in the front-rear direction, wherein,

[0089] The central frame has a hollow shape,

[0090] A conductive component (bus bar unit 140) for electrically connecting the first battery pack and the second battery pack is housed inside the central frame,

[0091] The first battery pack and the second battery pack are fixed to the central frame and the side frames,

[0092] The central frame and the side frames are fixed to the vehicle.

[0093] According to (1), a component configured with a conductive component that electrically connects the first battery pack and the second battery pack functions as a central frame component, and a plurality of battery packs are fixed to a vehicle via the central frame component and side frames. As a result, the number of components can be reduced to save space, and a plurality of battery packs with high versatility can be mounted on the vehicle.

[0094] (2) The vehicle-mounted structure of the battery pack according to (1), wherein,

[0095] The vehicle-mounted structure of the battery pack further includes:

[0096] A third battery pack (battery pack 10) that houses a single battery stack (single battery stack 30) formed by stacking a plurality of single batteries (single batteries 40), and is arranged adjacent to the first battery pack in the vehicle width direction; and

[0097] A bracket (bracket 130) that is arranged between the first battery pack and the third battery pack and extends in the front-rear direction,

[0098] The first battery pack and the third battery pack have protruding portions (protruding portions 26) that protrude in a mutually approaching manner on the opposing surfaces,

[0099] The protruding portions are provided at positions below the middle portions in the height direction of the first battery pack and the third battery pack,

[0100] The bottom surfaces of the protruding portions are fixed to the bracket.

[0101] According to (2), during a side collision of the vehicle, by deforming the protruding portions in a downwardly convex manner while in contact with each other, deformation of the floor toward the passenger compartment side can be suppressed.

[0102] (3) The vehicle-mounted structure of the battery pack according to (1) or (2), wherein,

[0103] The side frames are fixed to the bottom surfaces of the first battery pack and the second battery pack.

[0104] According to (3), the load input during a side collision of the vehicle can be suppressed from being input to the single battery.

[0105] (4) The vehicle-mounted structure of the battery pack according to (2), wherein,

[0106] The side frames are fixed to the bottom surfaces of the protruding portions of the first battery pack and the second battery pack.

[0107] According to (4), the load input during a side collision of the vehicle can be suppressed from being input to the single battery.

[0108] The vehicle-mounted structure of the battery pack according to any one of (1) to (4), wherein,

[0109] The central frame and the first battery pack have a first communication hole (first opening portion 91, front communication hole 121a) that communicates with each other,

[0110] The central frame and the second battery pack have a second communication hole (first opening portion 91, rear communication hole 122a) that communicates with each other,

[0111] The first communication hole and the second communication hole are displaced in the vehicle width direction.

[0112] According to (5), it is possible to ensure a fastening space for the extraction conductive member that extends from the terminal block of the first battery pack and is connected to the conductive member and the extraction conductive member that extends from the terminal block of the second battery pack and is connected to the conductive member.

[0113] The vehicle-mounted structure of the battery pack according to any one of (1) to (5), wherein,

[0114] The central frame has a bottom surface opening portion (bottom surface opening portion 124) on the bottom surface,

[0115] The bottom surface opening portion is sealed by a cover member (bottom surface cover 126) with a sealing member (sealing member 14) interposed therebetween.

[0116] According to (6), connection work can be performed from the bottom surface opening portion, and water intrusion into the central frame can be avoided.

[0117] The vehicle-mounted structure of the battery pack according to any one of (1) to (6), wherein,

[0118] The central frame and the first battery pack have a first communication hole (first opening portion 91, front communication hole 121a) that communicates with each other,

[0119] The central frame and the second battery pack have a second communication hole (first opening portion 91, rear communication hole 122a) that communicates with each other,

[0120] The terminal block (terminal block 60) of the first battery pack and the terminal block (terminal block 60) of the second battery pack are displaced in the vehicle width direction.

[0121] According to (7), it is possible to suppress interference between the extraction conductive member that extends from the terminal block of the first battery pack and is connected to the conductive member and the extraction conductive member that extends from the terminal block of the second battery pack and is connected to the conductive member.

[0122] The vehicle-mounted structure of the battery pack according to (7), wherein,

[0123] The first battery pack and the second battery pack have the same shape,

[0124] The terminal blocks of the first battery pack and the second battery pack are displaced in the vehicle width direction with respect to the center line in the vehicle width direction of the first battery pack and the second battery pack.

[0125] According to (8), by arranging battery packs having the same shape in a state where they are rotated 180° so as to face each other in the front-rear direction, the positions of the terminal blocks can be displaced.

Claims

1. A vehicle-mounted structure of a battery pack, comprising: A first battery pack and a second battery pack that accommodate a cell stack formed by stacking a plurality of cells and are arranged adjacent to each other in the 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; and a side frame, which is arranged on at least one side of the first battery pack and the second battery pack in the vehicle width direction and extends along the front-rear direction, wherein: The central frame has a hollow shape, A conductive member for electrically connecting the first battery pack and the second battery pack is accommodated inside the central frame. The first battery pack and the second battery pack are fixed to the central frame and the side frame, The center frame and the side frames are fixed to the vehicle.

2. The vehicle-mounted structure of the battery pack according to claim 1, wherein: The vehicle-mounted structure of the battery pack further comprises: a third battery pack that accommodates a cell stack formed by stacking a plurality of cell stacks and is disposed adjacent to the first battery pack in the vehicle width direction; and a bracket, which is disposed between the first battery pack and the third battery pack and extends along the front-to-back direction, The first battery pack and the third battery pack have protrusions on opposing surfaces that protrude in a manner close to each other. The protrusion is provided at a position lower than the middle portion in the height direction of the first battery pack and the third battery pack. The bottom surface of the protrusion is fixed to the bracket.

3. The vehicle-mounted structure of the battery pack according to claim 1 or 2, wherein: The side frame is fixed to the bottom surfaces of the first battery pack and the second battery pack.

4. The vehicle-mounted structure of the battery pack according to claim 2, wherein: The side frame is fixed to the bottom surfaces of the protruding portions of the first battery pack and the second battery pack.

5. The vehicle-mounted structure of a battery pack according to claim 1 or 2, wherein: The central frame and the first battery pack have a first communicating hole that communicates with each other. The central frame and the second battery pack have a second communicating hole that communicates with each other. The first communication hole and the second communication hole are offset in the vehicle width direction.

6. The vehicle-mounted structure of the battery pack according to claim 5, wherein: The central frame has a bottom opening on the bottom surface. The bottom opening is sealed by a cover member via a sealing member.

7. The vehicle-mounted structure of a battery pack according to claim 1 or 2, wherein: The central frame and the first battery pack have a first communicating hole that communicates with each other. The central frame and the second battery pack have a second communicating hole that communicates 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.

8. The vehicle-mounted structure of the battery pack according to claim 7, wherein: 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 a center line of the first battery pack and the second battery pack in the vehicle width direction.

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