Battery pack

Abstract

We provide battery packs that are compatible with batteries of different sizes. [Solution] The battery pack 10 comprises a case frame 30 positioned outside the case 12 and a battery frame 50 positioned inside the case 12. The case frame 30 extends along the bottom wall 20 of the case 12 in the vehicle longitudinal direction, is spaced apart in the vehicle width direction, and has a first flange portion 33 and a second flange portion 34 joined to the outer surface of the bottom wall 20. The battery frame 50 extends along the bottom wall 20 in the vehicle longitudinal direction and has a bottom portion 51 joined to the inner surface of the bottom wall 20. When viewed from above, the bottom portion 51 overlaps with either the first flange portion 33 or the second flange portion 34.

Description

Technical Field

[0001] The present invention relates to a battery pack mounted on a vehicle.

Background Art

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

[0003] In the battery pack support structure of the battery pack described in Patent Document 1, the front side and the rear side of a stack formed by laminating a plurality of battery modules are fixed to the bottom surface of the pack case via brackets and fixing fittings. A cross beam bent in a hat shape is joined to the bottom surface of the pack case and the inner surfaces of the left and right side walls by welding or the like, and the brackets and fixing fittings are welded to the top surface of the cross beam.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Depending on different vehicle models and even different grades of the same vehicle model, the number of battery cells constituting each battery module may be different, and the sizes of the battery module and the stack before and after may change. In the battery pack support structure described in Patent Document 1, the battery fixing portion in the pack case is reinforced by the cross beam, but this cross beam is provided inside the back case. When sharing the pack case for battery modules and stacks of different sizes, the cross beam is moved according to the sizes of the battery module and the stack.

[0006] One of the objectives of the present invention is to provide a battery pack that can accommodate batteries of different sizes. [Means for solving the problem]

[0007] A battery pack according to one aspect of the present invention is A battery pack installed in a vehicle, Battery and A case for housing the aforementioned battery, A case frame is positioned on the outside of the case and secures the case to the vehicle body, A battery frame is positioned inside the case and secures the battery to the case, Equipped with, The aforementioned case is, The bottom wall on which the battery is placed, Extending upward from the first edge of the bottom wall which extends in the first direction, and facing the battery in a second direction perpendicular to the first direction, It has, The aforementioned case frame is A first flange portion extending in the first direction along the bottom wall of the case and joined to the outer surface of the bottom wall, The second flange portion is positioned at a distance from the first flange portion in the second direction, extends in the first direction along the bottom wall of the case, and is joined to the outer surface of the bottom wall, A main body portion that connects the first flange portion and the second flange portion and forms a closed cross section together with the bottom wall of the case in a cross section perpendicular to the first direction, It has, The battery frame has a bottom portion that extends in the first direction along the bottom wall of the case and is joined to the inner surface of the bottom wall, Viewed from above, at least a portion of the bottom portion of the battery frame overlaps with either the first flange portion or the second flange portion of the case frame. [Effects of the Invention]

[0008] According to the present invention, a battery pack that can accommodate batteries of different sizes can be provided. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of an example vehicle for illustrating embodiments of the present invention. [Figure 2] Figure 1 is an exploded perspective view of the battery pack installed in the vehicle. [Figure 3] Figure 2 is a plan view of the battery pack, showing an example of the battery frame arrangement in the battery pack. [Figure 4] Figure 3 is a cross-sectional view of the battery pack. [Figure 5] Figure 2 is a plan view of the battery pack, showing another example of the battery frame arrangement in the battery pack. [Figure 6] Figure 5 is a cross-sectional view of the battery pack. [Figure 7] This is a schematic diagram illustrating the miniaturization of the battery pack shown in Figure 2. [Figure 8] Figure 2 is a perspective view of the mounting base and extension provided at the end of the battery frame. [Figure 9] This is a perspective view of the extension provided at the end of the case frame in Figure 2. [Modes for carrying out the invention]

[0010] An example of a vehicle for illustrating embodiments of the present invention will be described based on the attached drawings. The drawings should be viewed in the direction of the reference numerals. Furthermore, in this specification and elsewhere, for the sake of simplicity and clarity, the front, rear, left, right, and up directions are described according to the direction as seen from the driver of the vehicle, and in the drawings, the front of the vehicle 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.

[0011] The vehicle 1 shown in Fig. 1 is an electric vehicle such as, for example, a battery-powered electric vehicle, a hybrid vehicle (including a plug-in hybrid vehicle), a fuel cell vehicle, or the like. This vehicle 1 includes a vehicle body 2, a seat 3, and a battery pack 10. The vehicle body 2 constitutes the skeleton of the vehicle 1, and the battery pack 10 stores and discharges electric power to be supplied to a motor M or the like that serves as a drive source of the vehicle.

[0012] The vehicle body 2 includes a floor panel 4. The floor panel 4 constitutes a part of the skeleton at the lower part of the vehicle. Although not shown in the figure, the vehicle body 2 may also include, as members constituting the skeleton at the lower part of the vehicle, a pair of side sills extending in the longitudinal direction of the vehicle along both sides of the floor panel 4, a cross member spanned between the pair of side sills, and the like. The seat 3 is installed on the floor panel 4.

[0013] The battery pack 10 is also installed on the floor panel 4 and is located below the seat 3 in the example shown in Fig. 1. A recess 5 is formed in the floor panel 4, and the battery pack 10 is housed in the recess 5. By housing the battery pack 10 in the space under the seat, which would otherwise be dead space, the interior space of the vehicle 1 can be expanded.

[0014] As shown in Figs. 2 and 3, the battery pack 10 includes a battery 11 and a case 12 that houses the battery 11. The battery 11 includes a plurality of battery cells. The battery cells are, for example, lithium-ion batteries or nickel-metal hydride batteries using a liquid electrolyte, or all-solid-state batteries using a solid electrolyte. The battery 11 is typically modularized with a plurality of battery cells connected in series and / or in parallel.

[0015] The case 12 includes a case body 13 and a case cover 14. The case body 13 is formed in a tray shape capable of housing the battery 11. The case body 13 is made of a metal plate material such as, for example, an aluminum alloy or steel. The case cover 14 covers the case body 13 from above. The case cover 14 is formed of a steel plate.

[0016] Case 12 further houses electrical equipment such as a junction box 15 and busbars. The junction box 15 controls the connection between the vehicle's charging system and the battery pack 10, as well as the connection between the inverter that drives the motor M and the battery pack 10. The busbars connect the modularized batteries 11 to each other, and also connect the batteries 11 to the junction box.

[0017] The tray-shaped case body 13 has a bottom wall 20 on which the battery 11 and junction box 15 are placed, and side walls 21, 22, 23, and 24 extending upward from the front, rear, left, and right edges of the bottom wall 20. The side walls 21 and 22 are arranged facing each other in the vehicle's front-to-rear direction and each extends in the vehicle's width direction. The side walls 23 and 24 are arranged facing each other in the vehicle's width direction and each extends in the vehicle's front-to-rear direction.

[0018] The battery 11 and the junction box 15 are arranged side by side in the vehicle width direction. The battery 11 is positioned adjacent to the left side wall 23 in the vehicle width direction, and the junction box 15 is positioned adjacent to the right side wall 24 in the vehicle width direction.

[0019] The battery pack 10 further comprises a first case frame 30 and a second case frame 40, and a first battery frame 50 and a second battery frame 60. The first case frame 30 and the second case frame 40 are located on the outside of the case 12 and fix the case 12 to the vehicle body 2. The first battery frame 50 and the second battery frame 60 are located on the inside of the case 12 and fix the battery 11 to the case body 13. In the example shown in Figure 2, the second battery frame 60 is integrally provided with a fixing plate 61 for fixing the junction box 15 to the case body 13.

[0020] The first battery frame 50 and the second battery frame 60 are spaced apart in the vehicle width direction and extend in the vehicle longitudinal direction. The first battery frame 50 and the second battery frame 60 are joined to the inner surface of the bottom wall 20 of the case body 13 by appropriate methods such as welding, fastening with bolts or rivets. The first battery frame 50 supports the side of the battery 11 in the vehicle width direction that is closer to the side wall 23 of the case body 13, and the second battery frame 60 supports the side of the battery 11 that is closer to the junction box 15.

[0021] The first case frame 30 and the second case frame 40 extend in the longitudinal direction of the vehicle. The ends 31 and 32 on both sides of the first case frame 30 in the longitudinal direction of the vehicle protrude outward from the case body 13, and these ends 31 and 32 are fixed to the vehicle body 2. Similarly, the ends 41 and 42 on both sides of the second case frame 40 in the longitudinal direction of the vehicle protrude outward from the case body 13, and these ends 41 and 42 are fixed to the vehicle body 2.

[0022] The first case frame 30 is positioned to overlap with the first battery frame 50, with the bottom wall 20 of the case body 13 in between, and reinforces the joint area with the first battery frame 50 at the bottom wall 20. The second case frame 40 is positioned to overlap with the second battery frame 60, with the bottom wall 20 in between, and reinforces the joint area with the second battery frame 60 at the bottom wall 20.

[0023] Figures 3 to 6 show examples of the arrangement of the first battery frame 50 according to the size of the battery 11. In Figures 3 and 4, the dimensions of the battery 11 in the vehicle width direction are relatively large, while in Figures 5 and 6, the dimensions of the battery 11 in the vehicle width direction are relatively small. The arrangement of the second battery frame 60 is fixed regardless of the dimensions of the battery 11 in the vehicle width direction.

[0024] As shown in Figures 3 and 4, when the dimensions of the battery 11 in the vehicle width direction are relatively large, the first battery frame 50, which supports the side of the battery 11 in the vehicle width direction that is closer to the side wall 23 of the case body 13, is positioned at a first position P1 adjacent to the side wall 23. On the other hand, as shown in Figures 5 and 6, when the dimensions of the battery 11 in the vehicle width direction are relatively small, the first battery frame 50 is positioned at a second position P2 that is shifted from the first position P1 toward the center of the case body 13 in the vehicle width direction. The first battery frame 50 has a bottom portion 51 that extends in the vehicle longitudinal direction along the bottom wall 20 of the case body 13, and the bottom portion 51 is joined to the inner surface of the bottom wall 20.

[0025] The first case frame 30 has a first flange portion 33, a second flange portion 34, and a main body portion 35. The first flange portion 33 extends along the bottom wall 20 in the vehicle longitudinal direction and is joined to the outer surface of the bottom wall 20 by appropriate methods such as welding, fastening with bolts or rivets. The second flange portion 34 is positioned at a distance from the first flange portion 33 in the vehicle width direction, extends along the bottom wall 20 in the vehicle longitudinal direction, and is joined to the outer surface of the bottom wall 20. The main body portion 35 connects the first flange portion 33 and the second flange portion 34. The main body portion 35 is formed in a U-shape in a cross section perpendicular to the vehicle longitudinal direction, and together with the bottom wall 20 forms a closed cross section, reinforcing the bottom wall 20.

[0026] As shown in Figures 3 and 4, when the first battery frame 50 is positioned at the first position P1, at least a portion of the bottom portion 51 of the first battery frame 50 overlaps with the first flange portion 33 of the first case frame 30 when viewed from above. On the other hand, as shown in Figures 5 and 6, when the first battery frame 50 is positioned at the second position P2, at least a portion of the bottom portion 51 of the first battery frame 50 overlaps with the second flange portion 34 of the first case frame 30 when viewed from above.

[0027] Thus, because the first case frame 30, which reinforces the joint area between the case body 13 and the first battery frame 50 on the bottom wall 20, is positioned on the outside of the case 12, it is possible to accommodate batteries of different sizes by moving only the first battery frame 50, which fixes the battery 11 to the bottom wall 20, according to the size of the battery 11, while keeping the position of the first case frame 30 the same.

[0028] Preferably, the bottom portion 51 of the first battery frame 50, the bottom wall 20 of the case body 13, and either the first flange portion 33 or the second flange portion 34 of the first case frame 30 are integrally joined. This increases the overall rigidity of the first case frame 30, the first battery frame 50, and the case body 13. Here, when we say that the bottom portion 51, the bottom wall 20, and either the first flange portion 33 or the second flange portion 34 are integrally joined, it means that either the first flange portion 33 or the second flange portion 34 is further joined to the joint between the bottom portion 51 and the bottom wall 20.

[0029] The first battery frame 50 is not particularly limited as long as it has the bottom portion 51 described above, and may be formed in a rectangular or C-shape in a cross section perpendicular to the vehicle's longitudinal direction, but in this example it is formed in a crank shape in a cross section perpendicular to the vehicle's longitudinal direction. Specifically, the first battery frame 50 has a top portion 52 that extends in the vehicle's longitudinal direction, spaced upward from the bottom wall 20 of the case body 13, and a connecting portion 53 that connects the bottom portion 51 and the top portion 52. The connecting portion 53 extends upward from the edge of the bottom portion 51 on either side in the vehicle width direction that is closer to the side wall 23 of the case body 13, and the top portion 52 extends toward the side wall 23 from the upper end of the connecting portion 53. The top portion 52 is in a so-called cantilever state, where only the edge opposite to the side wall 23 is supported by the connecting portion 53.

[0030] As shown in Figure 7, this crank-shaped first battery frame 50 contributes to the miniaturization of the battery pack 10. As a reference example for comparison, a battery pack 10 having a hat-shaped battery frame 100 formed in a cross section perpendicular to the vehicle's longitudinal direction is used, and in the battery pack 10 equipped with the first battery frame 50, the side wall 23 of the case body 13 is shifted toward the center in the vehicle width direction. Conversely, compared to the first battery frame 50, the battery frame 100 has an additional L-shaped support wall 101 that supports the edge of the top portion 52 near the side wall 23, and in the reference example battery pack, the side wall 23 is pushed outward by the amount of the support wall 101.

[0031] Furthermore, in the battery pack 10 equipped with the first battery frame 50, the base end of the side wall 23 of the case body 13 extends below the top portion 52, thereby further miniaturizing the case body 13.

[0032] The battery 11 may be fitted between the first battery frame 50 and the second battery frame 60. In the example shown in Figure 7, an L-shaped bracket 70 is attached to the side of the battery 11 facing the side wall 23 of the case body 13, and the bracket 70 is fixed to the top portion 52 of the first battery frame 50. The battery 11 is positioned on the opposite side of the side wall 23 from the top portion 52, and by appropriately setting the height H of the bracket 70, the bottom of the battery 11 is positioned below the top portion 52. The area around the second battery frame 60 is configured similarly, although it is not shown in the figure. This makes it possible to reduce the height of the battery pack 10.

[0033] Fixing bases 54 are provided at both ends of the top portion 52 of the first battery frame 50 in the vehicle's longitudinal direction, to which brackets 70 are fixed. As shown in Figure 8, the fixing bases 54 protrude in the vehicle width direction away from the side wall 23 of the case body 13, more than the middle portion of the top portion 52 in the vehicle's longitudinal direction. The ends 55 on both sides of the connection portion 53 of the first battery frame 50, which are connected to the fixing bases 54, bulge out in the vehicle width direction away from the side wall 23, more than the middle portion of the connection portion 53 in the vehicle's longitudinal direction. The fixing bases 54 of the top portion 52 and the ends 55 of the connection portion 53 give the first battery frame 50 a three-dimensional shape, which can suppress bending of the cantilevered top portion 52.

[0034] From the viewpoint of increasing the rigidity of the first case frame 30 and the first battery frame 50, the first case frame 30 and the first battery frame 50 may extend along the side walls 21 and 22 of the case body 13 in the vehicle's longitudinal direction.

[0035] As shown in Figure 8, the first battery frame 50 has an extension portion 56 that extends from one end of the bottom portion 51, the top portion 52, and the connecting portion 53 near the side wall 21 in the vehicle's longitudinal direction. The extension portion 56 extends upward along the inner surface of the side wall 21 and is joined to the inner surface of the side wall 21. Although not shown in the figure, a similar extension portion is also provided at one end of the first battery frame 50 near the side wall 22 in the vehicle's longitudinal direction and is joined to the inner surface of the side wall 22. This gives the first battery frame 50 a three-dimensional shape, which helps to suppress the bending of the cantilevered top portion 52.

[0036] Furthermore, as shown in Figure 9, the first case frame 30 has an extension portion 36 extending from one end of the first flange portion 33 and the second flange portion 34, as well as the main body portion 35, near the side wall 21 in the vehicle's longitudinal direction. The extension portion 36 extends upward along the outer surface of the side wall 21 and is joined to the outer surface of the side wall 21. More specifically, the extension portion 36 includes a first flange extension portion 37 continuing from the first flange portion 33, a second flange extension portion 38 continuing from the second flange portion 34, and a main body extension portion 39 continuing from the main body portion 35, with the first flange extension portion 37 and the second flange extension portion 38 being joined to the outer surface of the side wall 21. Although not shown in the figure, a similar extension portion is also provided at one end of the first case frame 30 near the side wall 22 in the vehicle's longitudinal direction and is joined to the outer surface of the side wall 22. This further reinforces the joint area between the case body 13 and the first battery frame 50.

[0037] Preferably, the extended portion 36 of the first case frame 30, the extended portion 56 of the first battery frame 50, and the side wall 21 of the case body 13 are integrally joined. This increases the overall rigidity of the first case frame 30, the first battery frame 50, and the case body 13.

[0038] Preferably, the first flange extension 37 of the first case frame 30 has an expanded joint 37a that is wider in the vehicle width direction than the first flange portion 33, and the second flange extension 38 has an expanded joint 38a that is wider in the vehicle width direction than the second flange portion 34, and at least the expanded joints 37a and 38a are joined to the outer surface of the side wall 21 of the case body 13. The expanded joints 37a and 38a are each formed to be approximately the same width as the extension 56 of the first battery frame 50, and when the extension 36 of the first case frame 30, the extension 56 of the first battery frame 50, and the side wall 22 of the case body 13 are joined together, a sufficient joining area can be provided for the extension 36.

[0039] This specification contains at least the following:

[0040] (1) A battery pack (battery pack 10) installed in a vehicle, Battery (Battery 11), A case (case 12) for housing the aforementioned battery, A case frame (first case frame 30) is positioned on the outside of the case and secures the case to the vehicle body, A battery frame (first battery frame 50) is positioned inside the case and secures the battery to the case, Equipped with, The aforementioned case is, The bottom wall (bottom wall 20) on which the battery is placed, A first side wall (side wall 23) extends upward from the first edge of the bottom wall which extends in the first direction, and faces the battery in a second direction perpendicular to the first direction, It has, The aforementioned case frame is A first flange portion (first flange portion 33) extends in the first direction along the bottom wall of the case and is joined to the outer surface of the bottom wall, The second flange portion (second flange portion 34) is positioned at a distance from the first flange portion in the second direction, extends in the first direction along the bottom wall of the case, and is joined to the outer surface of the bottom wall, A main body portion (main body portion 35) connects the first flange portion and the second flange portion, and together with the bottom wall of the case in a cross section perpendicular to the first direction, It has, The battery frame has a bottom portion (bottom portion 51) that extends in the first direction along the bottom wall of the case and is joined to the inner surface of the bottom wall, Viewed from above, at least a portion of the bottom portion of the battery frame overlaps with either the first flange portion or the second flange portion of the case frame. Battery pack.

[0041] According to the battery pack described in (1) above, the case frame that reinforces the joint area with the battery frame on the bottom wall of the case is located on the outside of the case. This allows the battery frame that secures the battery to the bottom wall to be moved to a position that overlaps with the first flange portion or the second flange portion of the case frame, depending on the size of the battery, while keeping the position of the case frame the same, thereby accommodating batteries of different sizes.

[0042] (2) The battery pack described in (1) above, The bottom portion of the battery frame, the bottom wall of the case, and either the first flange portion or the second flange portion of the case frame are integrally joined. Battery pack.

[0043] According to the battery pack described in (2) above, the rigidity of the case frame, battery frame, and the case as a whole can be increased.

[0044] (3) The battery pack described in (1) or (2) above, The aforementioned battery frame is The top portion (top portion 52) of the case extends upward from the bottom wall and in the first direction, supporting the battery, The bottom portion and the top portion are connected by a connecting portion (connecting portion 53), It has, The connecting portion extends upward from the edge of the case closer to the first side wall among the edges of the bottom portion in the second direction, The top portion extends from the upper end of the connecting portion toward the first side wall of the case. Battery pack.

[0045] According to the battery pack described in (3) above, by making the top portion of the battery frame cantilevered, the first side wall of the case can be shifted toward the center in the first direction of the case, thereby enabling a miniaturization of the battery pack.

[0046] (4) The battery pack described in (3) above, The battery is positioned on the side of the case opposite to the first side wall with respect to the top portion of the battery frame. The bottom of the battery is located below the top portion of the battery frame. Battery pack.

[0047] According to the battery pack described in (4) above, the battery pack can be made lower in profile.

[0048] (5) The battery pack described in (3) above, At both ends of the top portion in the first direction, there are fixed bases (fixed bases 54) to which the battery is fixed. The fixing base protrudes in the second direction from the first side wall of the case, rather than from the intermediate portion of the top portion in the first direction. The ends (ends 55) of the connecting portion in the first direction, which are connected to the fixed base, bulge out in the second direction toward the side opposite to the first side wall of the case, compared to the middle portion of the connecting portion in the first direction. Battery pack.

[0049] According to the battery pack described in (5) above, the shape of the battery frame becomes three-dimensional, which can suppress the bending of the top part, which is in a cantilevered state.

[0050] (6) The battery pack described in (1) above, The case has a second side wall (side wall 21) that extends upward from the second edge of the bottom wall extending in the second direction and faces the battery in the first direction, The case frame has an extension portion (extension portion 36) extending from one end of the first flange portion and the second flange portion and the main body portion in the first direction, The extended portion of the case frame extends upward along the outer surface of the second side wall of the case and is joined to the outer surface of the second side wall. The battery frame has an extended portion (extended portion 56) that extends from one end of the battery frame in the first direction, The extended portion of the battery frame extends upward along the inner surface of the second side wall of the case and is joined to the inner surface of the second side wall. Battery pack.

[0051] According to the battery pack described in (6) above, the rigidity of the case frame and battery frame can be increased.

[0052] (7) The battery pack described in (6) above, The extended portion of the case frame, the extended portion of the battery frame, and the second side wall of the case are integrally joined together. Battery pack.

[0053] According to the battery pack described in (7) above, the rigidity of the case frame, battery frame, and the case as a whole can be increased.

[0054] (8) The battery pack of (6) or (7) above, The extension portion of the case frame is The first flange extension portion (first flange extension portion 37) continues from the first flange portion, The second flange extension portion (second flange extension portion 38) continues from the second flange portion, Includes, The first flange extension is wider in the second direction than the first flange portion and has an extended joint portion (extended joint portion 37a) that is joined to the outer surface of the second side wall of the case. The second flange extension is wider in the second direction than the second flange portion and has an expanded joint portion (expanded joint portion 38a) that is joined to the outer surface of the second side wall of the case. Battery pack.

[0055] According to the battery pack described in (8) above, when the extended portion of the case frame, the extended portion of the battery frame, and the second side wall of the case are joined together, a sufficient joining area can be provided to the extended portion. [Explanation of symbols]

[0056] 1 vehicle 2 car bodies 3 sheets 4 Floor Panels 10 Battery Packs 11 batteries 12 cases 13 Case body 14 Case Cover 15 Junction Box 20 Bottom wall 21,22,23,24 side wall 30. Case Frame 1 33 First flange section 34 Second flange section 35 Main body 36 Extension section 37. First flange extension section 37a Expanded joint 38. Second flange extension section 38a Expanded joint 39 Main body extension 40. Second case frame 50 First Battery Frame 51 Bottom section 52 Top section 53 Connection part 54 Fixed stand 56 Extension section 60. Second battery frame M Motor P1 1st position P2 2nd position

Claims

1. A battery pack installed in a vehicle, Battery and A case for housing the aforementioned battery, A case frame is positioned on the outside of the case and secures the case to the vehicle body, A battery frame is positioned inside the case and secures the battery to the case, Equipped with, The aforementioned case is, The bottom wall on which the battery is placed, A first side wall extends upward from the first edge of the bottom wall which extends in the first direction, and faces the battery in a second direction perpendicular to the first direction, It has, The aforementioned case frame is A first flange portion extending in the first direction along the bottom wall of the case and joined to the outer surface of the bottom wall, The second flange portion is positioned at a distance from the first flange portion in the second direction, extends in the first direction along the bottom wall of the case, and is joined to the outer surface of the bottom wall, A main body portion that connects the first flange portion and the second flange portion and forms a closed cross section together with the bottom wall of the case in a cross section perpendicular to the first direction, It has, The battery frame has a bottom portion that extends in the first direction along the bottom wall of the case and is joined to the inner surface of the bottom wall, Viewed from above, at least a portion of the bottom portion of the battery frame overlaps with either the first flange portion or the second flange portion of the case frame. Battery pack.

2. A battery pack according to claim 1, The bottom portion of the battery frame, the bottom wall of the case, and either the first flange portion or the second flange portion of the case frame are integrally joined together. Battery pack.

3. A battery pack according to claim 1 or 2, The aforementioned battery frame is The top portion extends upward from the bottom wall of the case in the first direction and supports the battery, A connecting portion that connects the bottom portion and the top portion, It has, The connecting portion extends upward from the edge of the case closer to the first side wall among the edges of the bottom portion in the second direction, The top portion extends from the upper end of the connecting portion toward the first side wall of the case. Battery pack.

4. A battery pack according to claim 3, The battery is positioned on the side of the case opposite to the first side wall with respect to the top portion of the battery frame. The bottom of the battery is located below the top portion of the battery frame. Battery pack.

5. A battery pack according to claim 3, At both ends of the top portion in the first direction, there are mounting bases for which the battery is fixed. The fixing base protrudes in the second direction from the first side wall of the case, beyond the intermediate portion of the top portion in the first direction, Both ends of the connecting portion in the first direction, which are connected to the fixed base, bulge out in the second direction toward the side opposite to the first side wall of the case, compared to the middle portion of the connecting portion in the first direction. Battery pack.

6. A battery pack according to claim 1, The case has a second side wall that extends upward from the second edge of the bottom wall that extends in the second direction and faces the battery in the first direction, The case frame has the first flange portion, the second flange portion, and an extended portion extending from one end of the main body portion in the first direction, The extended portion of the case frame extends upward along the outer surface of the second side wall of the case and is joined to the outer surface of the second side wall. The battery frame has an extended portion extending from one end of the battery frame in the first direction, The extended portion of the battery frame extends upward along the inner surface of the second side wall of the case and is joined to the inner surface of the second side wall. Battery pack.

7. A battery pack according to claim 6, The extended portion of the case frame, the extended portion of the battery frame, and the second side wall of the case are integrally joined together. Battery pack.

8. A battery pack according to claim 6 or 7, The extension portion of the case frame is The first flange extension portion continues from the first flange portion, The second flange extension portion, which continues from the second flange portion, Includes, The first flange extension is wider in the second direction than the first flange portion and has an extended joint that is joined to the outer surface of the second side wall of the case. The second flange extension is wider in the second direction than the second flange portion and has an extended joint that is joined to the outer surface of the second side wall of the case. Battery pack.

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