Battery pack vehicle 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-mounted 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 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 a single battery pack in which multiple battery modules are housed in a battery case. For example, Patent Document 1 proposes a battery pack that includes 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, a waveguide is provided on the bottom surface so as to cross the central region of the pack case. Although the waveguide is fixedly coupled to the inner wall and can prevent deformation of the pack due to external impact, it 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-mounted battery pack structure 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 provides 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 arranged adjacent to each other in the front-to-rear direction of the vehicle; 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; disposed between the first battery pack and the second battery pack; The aforementioned a central frame extending in the 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; a bracket disposed between the first battery pack and the third battery pack and extending in the front-rear direction; A vehicle-mounted battery pack structure comprising: 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 center frame and the side frames are fixed to the vehicle. 、 the first battery pack and the third battery pack have protrusions on opposing surfaces thereof that protrude toward each other, the protrusion is provided below intermediate portions of the first battery pack and the third battery pack in a height direction, The bottom surface of the protrusion is fixed to the bracket. . The present invention also provides 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 arranged adjacent to each other in the front-to-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, 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 second communication holes communicating with each other; The first communication hole and the second communication hole are offset in the vehicle width direction. The present invention also provides 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 arranged adjacent to each other in the front-to-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; 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 second communication holes 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. [Effects 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 explanation of the drawings]

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

[0011] An embodiment of a battery pack of the present invention will be described below with reference to the accompanying drawings. For convenience, the following description will be made using a coordinate system consisting of mutually orthogonal longitudinal, lateral, and vertical directions. In the drawings, the front is indicated as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D. However, these directions are unrelated to the orientation of the battery pack when mounted in a device. For example, when the battery pack is mounted in a vehicle, the top and bottom of the battery pack may face the direction of travel of the vehicle or the width of the vehicle.

[0012] [Battery pack] As shown in FIGS. 1 and 2, the battery pack 10 includes two cell stacks 30 arranged side by side in the front-to-rear direction inside a box-shaped case 20. As shown in FIG. 3, the cell stack 30 includes a plurality of rectangular battery cells 40 stacked in the left-to-right direction and an end plate 31 arranged on one side in the left-to-right direction (the left side in this embodiment), which are temporarily fixed in place with a predetermined pressure 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 that surrounds the bottom surface of the cell stack 30, a rectangular upper restraint portion 52 that surrounds 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-to-rear direction, and the lower restraint portion 51 and the pair of side restraint portions 53 are integrally formed. It should be noted that another end plate, separator, etc. may be arranged on the other left-right side of the cell stack 30 (the right side in this embodiment) so that the battery cells 40 on the other side do not come into direct contact with the case 20. Furthermore, the cell stack 30 does not have to be configured so that the multiple battery cells 40 are restrained by the binder 50; that is, the multiple battery cells 40 may be configured so that they are directly stacked inside the case 20.

[0013] The battery cells 40 are, for example, secondary batteries such as lithium-ion batteries. A pair of terminals 42 and a safety valve 44 disposed between the pair of terminals 42 are provided on the upper surface of the battery cell 40. The pair of terminals 42 include a positive terminal and a negative terminal. For example, the positive terminal is connected to the negative terminal of an adjacent battery cell 40 via a bus bar (not shown), and the negative terminal is connected to the positive terminal of an 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-to-rear orientation is alternately reversed.

[0014] The safety valve 44 is a burst valve that prevents the outer can from bursting if the internal pressure of the battery cell 40 increases abnormally. If 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 in the center of the front-to-rear direction of the battery cell 40, multiple 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] 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 the left ends of the front wall portion 82 and the rear wall portion 84, a right wall portion 87 that connects the 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 forms a cell accommodating space 25 that accommodates the cell stack 30.

[0016] An opening 86a that connects the cell accommodating space 25 to the outside is provided in the left wall 86, and a pressure plate 28 is attached to it 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. When the pressure plate 28 presses the end plates 31 inward, the cell stack 30, which has been 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 by 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 the safety valves 44 of the battery cells 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 middle of the battery pack 10 in the height direction, for example, near the bottom, that 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 also 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] Furthermore, a bulge 22 is formed in front of and to the left of the front wall 82, protruding further forward from the front wall 82. A space is formed inside the bulge 22, with a first opening 91 provided on the front surface and a second opening 92 provided on the top surface. A terminal block 60 to which the output conductive member 70 is connected is provided in the internal space of the bulge 22, thereby constituting the output terminal accommodating space 27. The terminal block 60 electrically connects a terminal portion (output terminal) of the output conductive member 61 extending from the cell accommodating space 25 into the output terminal accommodating space 27 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, respectively, of the two cell stacks 30 electrically connected in series. The output conductive member 70 includes a positive bus bar 72 and a negative bus bar 73 that are connected to external positive and negative terminals, respectively.

[0020] 4, the first opening 91 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. 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 of the battery pack 10 in the left-right direction.

[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 of the battery pack 10 in the left-right direction. 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 portions of the output conductive member 61 and the output conductive member 70 are preferably fastened together 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 way, by connecting the output conductive member 70 through the first opening 91 of the output terminal accommodating space 27, the battery pack 10 can be mounted on various devices.

[0023] Thus, the case 20 is provided inside with a cell accommodating space 25 that accommodates 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 extraction 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, an area separating the cell accommodating space 25 and the output terminal accommodating space 27 (hereinafter, this portion will be referred to as a partition portion 85) is lower in height than other areas. 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, a case cover 23 is attached to the top surface of the case 20, excluding the partition wall portion 85, via a first sealant 11 (e.g., a rubber seal). The case cover 23 is fixed to the top surface of the case 20 by welding, for example, friction stir welding. A second sealant 12 (e.g., a foam sealant) 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 sealant 11 and the second sealant 12. Sealing the cell accommodating space 25 from the outside prevents foreign matter from entering the cell accommodating space 25, thereby suppressing deterioration of the battery cells 40. It is preferable that a sealant, such as a foam sealant, is also provided in the gap between the signal line and the through hole provided in the partition wall portion 85.

[0027] The battery pack 10 configured in this manner does not include auxiliary devices such as a junction box that houses contactors, fuses, etc., or an ECU. Therefore, when using a single battery pack 10, a junction box and / or an ECU may be connected to the battery pack 10. When using multiple battery packs 10, the battery packs 10 may be electrically connected to each other using a connection box, and the junction box and / or an ECU may be connected to the connection box. Alternatively, the junction box and / or an ECU may be built into the connection box, and multiple battery packs 10 may be connected to the junction box and / or 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. The two battery packs 10 described above are arranged side by side in the space in front of the central frame 120, and the two battery packs 10 described above are also arranged side by side in the space behind the central frame 120. Hereinafter, this structure will be 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 rotated 180° so that the bulging portions 22 face each other in the front-to-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 and 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, and each 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, and each 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 that fasten 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, bolting. As shown in Fig. 8, the central frame 120 has fastening portions 123 on the front surface 121 and the rear surface 122, 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-beam.

[0034] The output conductive member 70 enters the hollow region 125 of the central frame 120 through the first opening 91 from the output terminal accommodating space 27 formed in the bulging portion 22 of each battery pack 10. 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 battery packs are rotated 180 degrees so that the bulging portions 22 face each other in the front-rear direction across the central frame 120, 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, through which the first opening 91 of the front battery pack 10 communicates, and the rear communication hole 122a, through which the first opening 91 of the rear battery pack 10 communicates, are offset in the vehicle width direction. This ensures a fastening space for the output conductive member 70.

[0035] Similarly, the terminal blocks 60 of the battery packs are offset in the left-right direction with respect to the center line L, so 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 extracting conductive member 70 extending from the terminal block 60 of the front battery pack 10 to pass through the front communicating hole 121a and connected to the bus bar unit 140, and the extracting conductive member 70 extending from the terminal block 60 of the rear battery pack 10 to pass through the rear communicating hole 122a and connected to the bus bar unit 140, are offset in the vehicle width direction. Therefore, the extracting conductive member 70 extending from the front battery pack 10 and the extracting 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] As shown in Fig. 7, a busbar unit 140 is disposed in the hollow region 125 of the central frame 120. The busbar unit 140 includes, for example, a plurality of connecting busbars, and electrically connects four battery packs 10 in series as shown by the arrows in Fig. 9. The central frame 120 is an example of the connection box described above.

[0037] A bottom opening 124 is provided on the back surface of the central frame 120, and the bottom opening 124 is liquid-tightly closed by a bottom cover 126 via a sealing member 14 (see FIG. 9 ). Because 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 are liquid-tightly fastened to the first opening 91 of each battery pack 10, 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 extraction conductive member 70 extending from each battery pack 10 into 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 its inner lower end, which holds the battery pack 10. More specifically, as described above, protrusions 26 are provided on the left and right side surfaces of the battery pack 10 (case 20) in the front-rear direction, protruding in a direction away from the battery pack 10 below the middle of the battery pack 10 in the height direction, and the bottom surfaces of the protrusions 26 are 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 protrusions 26 is fixed to the pack holding portion 112 of the right side frame 110R. In this way, the bottom surface of each battery pack 10 is fixed to the left side frame 110L or the right side frame 110R.

[0039] The protrusions 26 of the left and right battery packs 10 abut against each other, and the bottom surfaces of the protrusions 26 are fixed to a plate-shaped bracket 130 that extends from below in the fore-and-aft direction of the vehicle. This secures the left and right battery packs 10 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 portions 26 provided below the middle of the battery packs 10 in the height direction, so that in the event of a side collision of the vehicle, the protruding portions 26 abut against each other and deform to become convex downward. This makes it possible to prevent the floor panel of the vehicle from deforming toward the passenger compartment.

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

[0042] The battery assembly 100 configured in this manner is fixed to frame members of the vehicle by a pair of central support portions 128 that are provided on the central frame 120 shown in Fig. 8 and protrude upward, and by side support portions 111 that are 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 portions 128 that are provided on the central frame 120 are fixed to the bottom of a floor frame that extends in the vehicle width direction, and the side support portions 111 that are provided on the left side frame 110L and the right side frame 110R are fixed to the bottom of a pair of side frames that extend in the front-to-rear direction of the vehicle.

[0043] As described above, the central frame 120 has the bus bar units 140 disposed in the internal hollow region 125, which electrically connect the four battery packs 10. In other words, in the battery assembly 100, the member in which the bus bar units 140, which electrically connect the battery packs 10 to each other, are disposed 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. This reduces the number of parts and saves space, while allowing multiple highly versatile battery packs 10 to be mounted in the vehicle.

[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 conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above-described embodiments may be combined in any manner without departing from the spirit 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 and rear and left and right sides, but this is not limited to this. The battery assembly 100 may be composed of two battery packs 10, one on each of the front and rear sides, or two or more battery packs 10 may be arranged on each of the front and rear sides and two or more on each of the left and right sides.

[0046] The battery pack 10 may also 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 the components in parentheses correspond to those in the above-described embodiment, but are 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 the vehicle width direction; a side frame (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 vehicle structure.

[0049] According to (1), the component on which the conductive member electrically connecting the first battery pack and the second battery pack is 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) on opposing surfaces thereof that protrude toward each other, the protrusion is provided below intermediate portions of the first battery pack and the third battery pack in a height direction, The bottom surface of the protrusion is fixed to the bracket. Battery pack vehicle structure.

[0051] According to (2), when the vehicle is involved in a side collision, the protruding portions come into contact with each other and deform downward to form a convex shape, 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 frames are fixed to bottom surfaces of the first battery pack and the second battery pack; Battery pack vehicle structure.

[0053] According to (3), it is possible to prevent the load input to the battery cell during a side collision of the vehicle.

[0054] (4) The vehicle mounting structure of the battery pack according to (2), the side frames are fixed to bottom surfaces of the protrusions of the first battery pack and the second battery pack; Battery pack vehicle structure.

[0055] According to (4), it is possible to prevent the load input to the battery cell during a side collision of the vehicle.

[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 first communication holes (first opening 91, front communication hole 121a) that communicate 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 vehicle structure.

[0057] According to (5), it is possible to secure fastening space for the extracting conductive member that extends from the terminal block of the first battery pack and is connected to the conductive member, and the extracting conductive member that extends from the terminal block of the second battery pack and is connected to the 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 vehicle structure.

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

[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 first communication holes (first opening 91, front communication hole 121a) that communicate 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 vehicle structure.

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

[0062] (8) The vehicle mounting structure of the 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 vehicle structure.

[0063] According to (8), by arranging battery packs of the same shape rotated 180 degrees so that they face each other in the front-rear direction, the positions of the terminal blocks 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 central 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 member)

Claims

1. a first battery pack and a second battery pack, each containing a cell stack in which a plurality of battery cells are stacked, and arranged adjacent to each other in the front-rear direction of the vehicle; 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 central frame disposed between the first battery pack and the second battery pack and extending in the 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; a bracket disposed between the first battery pack and the third battery pack 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, the first battery pack and the third battery pack have protrusions on opposing surfaces thereof that protrude toward each other, the protrusion is provided below intermediate portions of the first battery pack and the third battery pack in a height direction, The bottom surface of the protrusion is fixed to the bracket. Battery pack vehicle structure.

2. 2. The vehicle-mounted battery pack structure according to claim 1, the side frames are fixed to bottom surfaces of the first battery pack and the second battery pack; Battery pack vehicle structure.

3. 2. The vehicle-mounted battery pack structure according to claim 1, the first battery pack and the second battery pack have another protrusion that protrudes toward the side frame on a surface facing the side frame, the side frames are fixed to bottom surfaces of the other protrusions of the first battery pack and the second battery pack; Battery pack vehicle structure.

4. A first battery pack and a second battery pack that house a cell stack in which a plurality of battery cells are stacked and are arranged adjacent to each other in the fore-and-aft 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, 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 second communication holes communicating with each other; The first communication hole and the second communication hole are offset in the vehicle width direction. Battery pack vehicle structure.

5. 5. The vehicle-mounted battery pack structure according to claim 4, the central frame has a bottom opening on its bottom surface; The bottom opening is sealed with a lid member via a sealing member. Battery pack vehicle structure.

6. A first battery pack and a second battery pack that house a cell stack in which a plurality of battery cells are stacked and are arranged adjacent to each other in the fore-and-aft 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, 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 second communication holes 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 vehicle structure.

7. 7. The vehicle-mounted battery pack structure according to claim 6, 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 vehicle structure.

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