Electricity storage device

Abstract

The invention relates to a power storage device. In the electricity storage device, a smoke exhaust hole is formed in a bottom plate of a lower case, and the smoke exhaust hole is arranged at a position overlapped with a safety valve of an electricity storage unit. The support unit has a panel connection portion connected to the common panel. The panel connection portion is disposed below the power storage unit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrical storage device. BACKGROUND

[0002] A power battery pack mounted on an electric vehicle is disclosed in Japanese Laid-Open Patent Publication No. 2022-525014. The power battery pack includes a plurality of battery cells. An explosion-proof valve that discharges smoke or gas inside is provided on each of the plurality of battery cells.

[0003] Although not described in the above-mentioned Japanese Laid-Open Patent Publication No. 2022-525014, sometimes the explosion-proof valve (safety valve) is provided on the lower surface of the battery cell, and smoke or gas is discharged from the lower surface of the battery cell (electrical storage unit). In this structure, a smoke discharge space (smoke discharge path) is formed below the battery cell. In this case, when a load is input from below to the electrical storage device due to interference between the electrical storage device and the road surface or the like, there is a concern that the member that forms the smoke discharge space is damaged. SUMMARY

[0004] The present disclosure was achieved in order to solve the above-described problems, and aims to provide an electrical storage device capable of improving the rigidity of a member that forms a space formed below an electrical storage unit.

[0005] An electrical storage device of one embodiment of the present disclosure includes at least one electrical storage unit and a frame. The at least one electrical storage unit includes a lower surface on which a safety valve is provided. The frame includes a lower case that supports the at least one electrical storage unit from below, a common panel that is provided below the lower case and forms a space between the common panel and a bottom surface of the lower case, and a lower case support plate that is provided between the lower case and the common panel and supports the lower case. A through-hole is formed in the bottom surface of the lower case, and the through-hole is provided at a position overlapping with the safety valve of the at least one electrical storage unit. The lower case support plate includes a panel connection portion that is connected to the common panel. The panel connection portion is provided below the at least one electrical storage unit.

[0006] In the electrical storage device of one embodiment of the present disclosure, as described above, the panel connection portion is provided below the at least one electrical storage unit. Thus, since the common panel is pressed from above by the lower case support portion via the panel connection portion, the common panel can be prevented from being deformed in a manner that is concave upward or vibrated in the up-down direction, for example, in response to a load input from below. Thus, the rigidity of the common panel with respect to a load input from below can be improved. Thus, the rigidity of the common panel that forms a space (smoke discharge space) formed below the electrical storage unit can be improved.

[0007] Also, the power storage device can include a surrounding member disposed in a space between the common panel and a bottom surface of the lower case and surrounding a region of the bottom surface of the lower case in which the through-hole is provided. Also, the lower case support plate can include a blast catching portion located outside the surrounding member. According to such a structure, it is possible to catch the blast that is scattered outside the surrounding member of the through-hole with the blast catching portion.

[0008] Also, the blast catching portion can include a first portion extending upward from the panel connecting portion and a second portion protruding from an upper portion of the first portion toward the surrounding member. According to such a structure, since the first portion extends upward from the panel connecting portion, it is possible to suppress the blast from exceeding the first portion and being scattered. Also, since the second portion protrudes from the upper portion of the first portion toward the surrounding member, it is possible to suppress the blast from being scattered from the upper side with the second portion. As a result, it is possible to further suppress the blast from exceeding the first portion and being scattered.

[0009] Also, the power storage device can further include a support member disposed in a gap between a portion of the lower case support plate other than the panel connecting portion and the common panel and supporting the lower case support plate from below. According to such a structure, it is possible to more stably support the lower case than in a case where the support member is not provided.

[0010] Also, the support member can be disposed on a side opposite the through-hole with respect to the panel connecting portion. According to such a structure, since a gap is not formed between the lower case support plate and the common panel at a position where the panel connecting portion is provided, it is possible to suppress the blast from the through-hole from being scattered to the support member.

[0011] Also, the panel connecting portion can include a first connecting portion and a second connecting portion. According to such a structure, it is possible to further improve the rigidity of the common panel compared to a case where only one panel connecting portion is provided.

[0012] Also, at least one of the power storage units can be formed in a long strip in a connecting portion arrangement direction in which the first connecting portion and the second connecting portion are arranged. According to such a structure, it is possible to press a portion of the common panel that extends in the long side direction of the power storage unit with the first connecting portion and the second connecting portion. As a result, it is possible to press a relatively long portion of the common panel that extends in the long side direction of the power storage unit with both the first connecting portion and the second connecting portion. Thus, it is possible to effectively improve the rigidity of the common panel.

[0013] It can also be that the at least one electricity storage unit includes a plurality of electricity storage units arranged in the unit arrangement direction in such a manner that the safety valve is arranged in multiple in the unit arrangement direction. The panel connecting portion includes a unit arrangement direction extension portion extending in the unit arrangement direction along the plurality of electricity storage units. According to such a structure, since the panel connecting portion (unit arrangement direction extension portion) that improves the rigidity of the common panel extends in the unit arrangement direction, it is possible to further improve the rigidity of the common panel.

[0014] The above and other objects, features, ways and advantages of the present application will become more apparent from the following detailed description of the application taken in conjunction with the accompanying drawings, which should be understood to be exemplary only and not limiting in any way. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a view schematically showing a vehicle equipped with an electricity storage device of an embodiment.

[0016] Figure 2 is a perspective view showing an electricity storage device and a vehicle body of an embodiment.

[0017] Figure 3 is a sectional view along the III-III line of Figure 2 .

[0018] Figure 4 is a perspective view showing a structure of an electricity storage unit.

[0019] Figure 5 is a perspective view showing a structure of a lower case of an electricity storage device.

[0020] Figure 6 is a perspective view showing a structure of a lower case in which a bracket unit is installed.

[0021] Figure 7 is an exploded perspective view showing a structure of a lower case and a cooler.

[0022] Figure 8 is an exploded perspective view showing a structure of a lower case and an inner side path defining portion.

[0023] Figure 9 is an exploded perspective view showing a structure of a lower case, a support unit, and a common panel.

[0024] Figure 10 is a plan view of the lower case viewed from below.

[0025] Figure 11 is a sectional view along the XI-XI line of Figure 10 .

[0026] Figure 12is a plan view showing the structure of the spacer.

[0027] Figure 13 is Figure 11 a partial enlarged view of the vicinity of the panel connecting portion of

[0028] Figure 14 is Figure 11 a partial enlarged view of the vicinity of the protruding portion of

[0029] Figure 15 is Figure 11 a partial enlarged view of the vicinity of the beam member of DETAILED DESCRIPTION

[0030] Embodiments of the present disclosure will be explained with reference to the drawings. In addition, in the drawings referred to below, the same or equivalent components are denoted by the same reference numerals.

[0031] Referring to Figures 1 to 15 , the power storage device 100 in one embodiment of the present disclosure will be explained. Figure 1 is a side view schematically showing a vehicle 900 equipped with the power storage device 100 of the present embodiment. In addition, the X direction, the Y direction, and the Z direction of the present specification are directions orthogonal to each other. For example, the X direction and the Y direction are the front-rear direction and the vehicle width direction of the vehicle 900 in the case where the power storage device 100 is mounted on the vehicle 900, respectively. The X1 direction and the X2 direction are the vehicle front direction and the vehicle rear direction, respectively. The Y1 direction and the Y2 direction are the vehicle left side and the vehicle right side, respectively. In addition, the Z direction is the up-down (plumb) direction. Furthermore, the X direction and the Y direction are examples of the "unit arrangement direction" and the "connecting portion arrangement direction" of the present disclosure, respectively.

[0032] As shown in Figure 1 , the vehicle 900 is equipped with a vehicle main body 910 and a device unit 930 in addition to the power storage device 100. As the vehicle 900, for example, a hybrid electric vehicle, a plug-in hybrid electric vehicle, a battery electric vehicle can be cited. The vehicle main body 910 includes a frame member 920. The frame member 920 is disposed at the bottom of the vehicle main body 910.

[0033] As shown in Figure 2 , the frame member 920 has a pair of first frames 921, a pair of second frames 922, a first beam frame 923, and a second beam frame 924.

[0034] The pair of first frames 921 faces each other in the X direction. Each first frame 921 has a shape extending along the Y direction.

[0035] A pair of second frames 922 face each other in the Y direction. Each second frame 922 has a shape that extends along the X direction. The ends of each second frame 922 in the X direction are connected to the first frame 921. The pair of second frames 922 together with the pair of first frames 921 form a generally square cylindrical frame that surrounds the energy storage device 100.

[0036] The first crossbeam frame 923 is disposed between a pair of first frames 921 and connects a pair of second frames 922 to each other.

[0037] The second crossbeam frame 924 is disposed between a pair of first frames 921 and connects a pair of second frames 922 to each other. The second crossbeam frame 924 is separate from the first crossbeam frame 923 in the X direction. The first crossbeam frame 923 and the second crossbeam frame 924, for example, constitute seat crossbeams.

[0038] The energy storage device 100 is mounted on the frame member 920. The energy storage device 100 is positioned below the first crossbeam frame 923 and the second crossbeam frame 924. The energy storage device 100 has four energy storage stacks 101 to 104. However, the number of energy storage stacks is not limited to four.

[0039] In this embodiment, each energy storage stack 101-104 is formed as a cuboid shape that is longer in the X direction. For example... Figure 2 As shown, the four energy storage stacks 101-104 are arranged in a manner that runs along the Y direction.

[0040] Figure 3 It is along Figure 2 A cross-sectional view along line III-III. (See example...) Figure 3 As shown, the energy storage device 100 includes an energy storage unit 10, a cooler 20, a frame 30, and a reinforcing member 40. At least one energy storage unit 10 is included in each energy storage stack 101-104. Figure 2 In this embodiment, in each energy storage stack 101-104, a plurality of (e.g., 50) energy storage cells 10 are arranged along the X direction. Furthermore, in... Figure 3 In the diagram, the direction of gas discharge from safety valve SV (described later) is indicated by a dashed arrow.

[0041] Each energy storage unit 10 includes an electrode body 11. The electrode body 11 can be formed by winding a positive electrode plate and a negative electrode plate with a separator in between, or by stacking a positive electrode plate and a negative electrode plate with a separator in between. The electrode body 11 is formed to be longer in the Y direction.

[0042] The cooler 20 cools the plurality of power storage units 10. In the present embodiment, the cooler 20 cools each power storage stack 101 to 104 (101 to 104) Figure 2 A cooling medium (oil or the like) flows in the cooler 20.

[0043] The frame 30 includes a lower case 31, an upper cover 32, and a common panel 33.

[0044] The upper cover 32 houses the plurality of power storage units 10 together with the lower case 31. In the present embodiment, the upper cover 32 houses the four power storage stacks 101 to 104 (101 to 104) Figure 2 ) together with the lower case 31 in a sealed state. The upper cover 32 is configured to cover each power storage stack 101 to 104 from above. The lower case 31 is configured to support each power storage stack 101 to 104 from below. The peripheral portion of the upper cover 32 is connected to the peripheral portion of the lower case 31 via a sealing member and by a bolt or the like.

[0045] The common panel 33 is provided below the lower case 31. The common panel 33 has a function of protecting the lower case 31. The common panel 33 can also be formed in a flat plate shape.

[0046] The bottom plate 31c of the lower case 31 and the common panel 33 are located below the plurality of power storage units 10. In addition, a smoke discharge space S is formed between the bottom plate 31c and the common panel 33. The smoke discharge space S constitutes a smoke discharge path for the gas from the power storage units 10 to flow. Further, the smoke discharge space S and the bottom plate 31c are each an example of the "space" and the "bottom surface" of the present disclosure.

[0047] A pair of end plates 51 that sandwich the plurality of power storage units 10 from both sides in the X direction is provided on both sides of the plurality of power storage units 10 in the X direction. A monitoring unit (Smart Battery Management) 52 is arranged outside each end plate 51 in the X direction.

[0048] The device unit 930 is arranged, for example, at the end in the X direction. In the present embodiment, the device unit 930 is arranged on the rear portion of the upper cover 32 in the front-rear direction of the vehicle 900. The device unit 930 has a junction box 931, an electricity supply unit 932, an electronic control unit 933, a first cooler 934, a second cooler 935, and a device cover 936.

[0049] The junction box 931 is arranged above the upper cover 32. The junction box 931 houses relays, fuses, and the like. The junction box 931 is cooled by the first cooler 934 arranged between the junction box 931 and the upper cover 32.

[0050] The power supply unit 932 is disposed above the junction box 931. The power supply unit 932 is cooled by a second cooler 935 disposed on the power supply unit 932. The electronic control unit 933 is disposed above the junction box 931.

[0051] The device cover 936 houses the junction box 931, the power supply unit 932, the electronic control unit 933, and the second cooler 935.

[0052] The reinforcement member 40 is disposed on the upper cover 32. The reinforcement member 40 has a function of dispersing a load applied to the electrical storage device 100 from above by an occupant of the vehicle 900.

[0053] In a case where gas is discharged from any of the electrical storage units 10, the gas is discharged to the outside of the frame 30 through the smoke discharging space S.

[0054] Figure 4 is a perspective view showing the structure of the electrical storage unit 10. As shown in Figure 4 each electrical storage unit 10 has a unit case 12, a pair of external terminals 13, and a safety valve SV. The unit case 12 houses an electrode body 11 Figure 3 ).

[0055] The unit case 12 is formed in a rectangular parallelepiped shape. The unit case 12 is composed of a metal such as aluminum. The electrical storage unit 10 is formed in a long strip in the Y direction. Specifically, the width W1 of the electrical storage unit 10 in the Y direction is larger than the width W2 of the electrical storage unit 10 in the X direction. Further, the height H of the electrical storage unit 10 is smaller than the width W1 and larger than the width W2.

[0056] The electrical storage unit 10 (the unit case 12) has a short side 1, a short side 2, a long side 3, a long side 4, an upper surface 5, and a lower surface 6.

[0057] The short side 1 and the short side 2 are arranged in the Y direction. Specifically, the short side 1 and the short side 2 are one end surface and the other end surface in the Y direction in the electrical storage unit 10, respectively.

[0058] The long side 3 and the long side 4 are arranged in the X direction. Specifically, the long side 3 and the long side 4 are one end surface and the other end surface in the X direction in the electrical storage unit 10, respectively.

[0059] The upper surface 5 and the lower surface 6 are arranged in the Z direction. Specifically, the upper surface 5 and the lower surface 6 are an end surface on the Z1 side and an end surface on the Z2 side in the electrical storage unit 10, respectively.

[0060] A pair of external terminals 13 are respectively disposed on short side 1 and short side 2. A safety valve SV is disposed on the lower surface 6. The safety valve SV opens when the pressure of smoke or gas inside the unit housing 12 reaches a certain value. That is, the lower surface 6 where the safety valve SV is disposed constitutes the pressure relief surface of the unit housing 12.

[0061] Figure 5 This is a perspective view showing the structure of the lower housing 31. The lower housing 31 includes a receiving portion 31a and a plate portion 31b. The receiving portion 31a includes a base plate 31c and a peripheral wall 31d. The base plate 31c is plate-shaped, and a plurality of smoke vents 31e are formed on the base plate 31c. The plurality of smoke vents 31e are arranged along the longitudinal direction (X direction) of the vehicle 900. In addition, the columns of the plurality of smoke vents 31e arranged along the X direction are arranged in a plurality of columns in the Y direction (in... Figure 5 (There are four in total). In addition, the smoke exhaust port 31e is an example of a "through hole" of this disclosure.

[0062] The peripheral wall 31d extends upward from the outer periphery of the base plate 31c. The peripheral wall 31d is annular. The peripheral wall 31d includes: a front wall 31f disposed in front (X1 side); a rear wall 31g disposed rearward (X2 side); a left side wall 31h disposed on the left side (Y1 side); and a right side wall 31i disposed on the right side (Y2 side). An upward-facing opening is formed in the receiving portion 31a. The plate portion 31b extends horizontally from the opening edge of the receiving portion 31a.

[0063] Here, a plurality of energy storage units 10 are arranged in the housing section 31a. The safety valve SV of the energy storage unit 10... Figure 4 The smoke exhaust port 31e and the smoke exhaust port 31e are arranged along the Z direction, and the safety valve SV is connected to the smoke exhaust port 31e.

[0064] like Figure 6 As shown, the energy storage device 100 includes a bracket unit 60 disposed on the outer peripheral surface of the housing 31a. The bracket unit 60 is disposed on the outer surface of the peripheral wall 31d of the lower housing 31. The bracket unit 60 includes a front bracket 61, a rear bracket 62, a rear bracket 63, a side bracket 64, and a side bracket 65.

[0065] The front bracket 61 is fixed to the outer surface of the front wall 31f of the lower housing 31. The rear brackets 62 and 63 are respectively disposed on the outer surface of the rear wall 31g. The rear brackets 62 and 63 are spaced apart in the Y direction. A gap 66 is formed between the rear brackets 62 and 63. The gap 66 is located at the center of the rear wall 31g in the Y direction.

[0066] Side bracket 64 is provided on the outer surface of the left side wall 31h. Side bracket 65 is provided on the outer surface of the right side wall 31i.

[0067] The bracket unit 60 is formed in a substantially ring shape, and a gap 66 is formed on the rear side (X2 side) in the X direction.

[0068] Figure 7 is a perspective view showing the lower case 31, the bracket unit 60, and the cooler 20. The cooler 20 includes a cooling portion 21, a connection portion 22, and a connection portion 23.

[0069] The cooling portion 21 is formed so as to extend in the X direction. The connection portion 22 is provided at a front end portion (end portion on the XI side) of the cooling portion 21, and the connection portion 23 is provided at a rear end portion (end portion on the X2 side) of the cooling portion 21.

[0070] A supply pipe and a discharge pipe, which are not shown, are connected to the connection portion 22. Further, a coolant is supplied from the supply pipe. The coolant passes through the inside of the cooling portion 21 and the connection portion 22, and returns to the connection portion 22. The coolant that has returned to the connection portion 22 is discharged from the discharge pipe.

[0071] The stack of the power storage 101 to 104 is disposed above the cooling portion 21 so as to sandwich the bottom plate 31c of the lower case 31 therebetween. Figure 2 The cooling portion 21 includes a first cooling portion 24, a second cooling portion 25, a third cooling portion 26, and a fourth cooling portion 27. The first cooling portion 24, the second cooling portion 25, the third cooling portion 26, and the fourth cooling portion 27 are arranged in this order from the Y2 side (in the Y direction).

[0072] The first cooling portion 24 has a flow-through portion 24A, a flow-through portion 24B, and a connection plate 24C. The second cooling portion 25 has a flow-through portion 25A, a flow-through portion 25B, and a connection plate 25C. The third cooling portion 26 has a flow-through portion 26A, a flow-through portion 26B, and a connection plate 26C. The fourth cooling portion 27 has a flow-through portion 27A, a flow-through portion 27B, and a connection plate 27C. Since the first cooling portion 24, the second cooling portion 25, the third cooling portion 26, and the fourth cooling portion 27 have the same structure as each other, only the first cooling portion 24 will be described in detail.

[0073] The flow-through portion 24A and the flow-through portion 24B are disposed at intervals in the Y direction. The flow-through portion 24A and the flow-through portion 24B are each formed so as to extend in the X direction.

[0074] The connection plate 24C is disposed between the flow-through portion 24A and the flow-through portion 24B, and is provided so as to connect the flow-through portion 24A and the flow-through portion 24B.

[0075] A plurality of holes 28 are formed in the connection plate 24C. The plurality of holes 28 are provided at intervals in the X direction.

[0076] Each hole 28 corresponds to each smoke exhaust hole 31e formed in the bottom plate 31c. In a state where the cooler 20 is fixed to the lower case 31, the holes 28 and the smoke exhaust holes 31e are aligned in the Z direction.

[0077] Further, instead of the plurality of holes 28 aligned in the X direction, an opening portion formed in a long strip in the X direction can be formed. In the opening portion as described above, in a state where the cooler 20 is fixed to the lower case 31, the smoke exhaust hole 31e formed in the lower case 31 communicates with the opening portion. By forming such an opening portion, it becomes easy to align the opening portion with the smoke exhaust hole 31e.

[0078] The cooler 20 is fixed to the bottom plate 31c of the lower case 31. Specifically, the cooler 20 is fixed to the bottom plate 31c by a thermally conductive adhesive not shown in FIG. 7. Figure 7

[0079] As shown in FIG. 8, the battery pack 100 is provided with an inner path regulation portion 70. The inner path regulation portion 70 is disposed on the lower surface of the cooler 20. Further, the inner path regulation portion 70 is an example of the "enclosure member" of the present disclosure. Figure 8

[0080] The inner path regulation portion 70 is disposed in the smoke exhaust space S between the common panel 33 and the bottom plate 31c of the lower case 31 (FIG. 7), and is formed in a ring shape. Figure 3

[0081] The inner path regulation portion 70 includes a front edge portion 71, a rear edge portion 72, a left edge portion 73, and a right edge portion 74. The front edge portion 71 and the rear edge portion 72 are disposed apart from each other in the X direction. The front edge portion 71 and the rear edge portion 72 extend in the Y direction, respectively. The left edge portion 73 and the right edge portion 74 are disposed apart from each other in the Y direction. The left edge portion 73 and the right edge portion 74 extend in the X direction, respectively.

[0082] An open portion 75 is formed between the front edge portion 71 and the left edge portion 73. An open portion 76 is formed between the front edge portion 71 and the right edge portion 74. An open portion 77 is formed between the rear edge portion 72 and the left edge portion 73. An open portion 78 is formed between the rear edge portion 72 and the right edge portion 74.

[0083] The front edge portion 71 is located on the front side (X1 side) in the inner path regulation portion 70. The front edge portion 71 is disposed on the lower surface of the connection portion 22 of the cooler 20.

[0084] The rear edge portion 72 is located on the rear side (X2 side) in the inner path regulation portion 70. The rear edge portion 72 is disposed on the lower surface of the connection portion 23 of the cooler 20.

[0085] ​​​The left side portion 73 is arranged between the end portion on the left side of the front portion 71 (the end portion on the Y1 side) and the end portion on the left side of the rear portion 72 (the end portion on the Y2 side). The left side portion 73 is arranged in the flow passage portion 27B.

[0086] The right side portion 74 is arranged between the end portion on the right side of the front portion 71 (the end portion on the Y2 side) and the end portion on the right side of the rear portion 72 (the end portion on the Y2 side). The right side portion 74 is arranged in the flow passage portion 24A.

[0087] As shown in FIG. 1, the power storage device 100 includes a lower case 31, a front bracket 61, a rear bracket 62, a rear bracket 63, a side portion bracket 64, a side portion bracket 65, a front portion 71, a rear portion 72, a left side portion 73, a right side portion 74, a flow passage portion 24A, a flow passage portion 27B, and a support unit 80. Figure 9

[0088] The support unit 80 includes a frame portion 81 and support plates 82 to 84. The frame portion 81 includes support plates 81a to 81d. The frame portion 81 is formed of a single metal plate or the like. That is, the support plates 81a to 81d are integrally formed. Further, the support plates 81a to 81d and the support plates 82 to 84 are each an example of the "lower case support plate" of the present disclosure.

[0089] The support plate 81a is arranged so as to extend in the Y direction along the front bracket 61 and the front portion 71. The support plate 81a is fixed to the front bracket 61. The support plate 81b is arranged so as to extend in the Y direction along the rear bracket 62, the rear bracket 63, and the rear portion 72, respectively. The support plate 81b is fixed to the rear brackets 62 and 63.

[0090] The support plate 81c is arranged so as to extend in the X direction along the side portion bracket 64 and the left side portion 73. The support plate 81c is fixed to the side portion bracket 64. The support plate 81d is arranged so as to extend in the X direction along the side portion bracket 65 and the right side portion 74. The support plate 81d is fixed to the side portion bracket 65.

[0091] The support plates 82 to 84 are arranged in the Y direction at intervals from each other in a space surrounded by the frame portion 81 (the support plates 81a to 81d). The support plates 82 to 84 are each arranged so as to extend in the X direction. The support plate 81c, the support plate 81d, and the support plates 82 to 84 each extend in the direction (the X direction) in which the plurality of power storage units 10 (the smoke exhaust holes 31e (FIG. 1) of the lower case 31, the flow passage portions 24A and 27B, and the support unit 80 are arranged. Figure 7

[0092] The end portion on the Y1 side of the support plate 81a is connected to the end portion on the X1 side of the support plate 81c. The end portion on the Y2 side of the support plate 81a is connected to the end portion on the X1 side of the support plate 81d. The end portion on the Y1 side of the support plate 81b is connected to the end portion on the X2 side of the support plate 81c. The end portion on the Y2 side of the support plate 81b is connected to the end portion on the X2 side of the support plate 81d.

[0093] ​​The frame portion 81 (support plates 81a to 81d) is fixed to the cradle unit 60 in a ring shape together with the common panel 33 by a plurality of bolts 86. In this way, the common panel 33 is fixed to the cradle unit 60 in a ring shape.

[0094] Further, the support plates 81a to 81d each have a panel connecting portion 81f described later. In addition, the support plates 82 to 84 each have a panel connecting portion 87 described later. Details of the panel connecting portions 81f and 87 are described later.

[0095] Figure 10 is a bottom view showing the cooler 20, the cradle unit 60, and the inner path defining portion 70. Further, in Figure 10 , the frame portion 81 and the support plates 82 to 84 are indicated by broken lines. In Figure 10 , the region R1 shows a region in the bottom plate 31c of the lower case 31 in which the smoke exhaust hole 31e (hole 28) is formed. The contact region R2 shows a region in which the support unit 80 (frame portion 81) contacts the cradle unit 60. Further, in Figure 10 , hatching is applied in order to make the contact region R2 clear. The contact region R2 is located outward of the inner path defining portion 70. The contact region R2 is formed so as to surround the inner path defining portion 70.

[0096] The outer path defining portion 90 is formed by contacting the support unit 80 (frame portion 81) with the cradle unit 60 in the contact region R2. That is, the outer path defining portion 90 is located outward of the inner path defining portion 70 (71 to 74) and is formed so as to surround the inner path defining portion 70. Further, the outer path defining portion 90 is a sealed portion formed by fastening the support unit 80 and the cradle unit 60. Thus, it is possible to prevent gas or the like from the power storage unit 10 from leaking to the outside of the power storage device 100 through the outer path defining portion 90.

[0097] The outer path defining portion 90 includes a front edge portion 91, a rear edge portion 92, a rear edge portion 93, a side edge portion 94, and a side edge portion 95.

[0098] The front edge portion 91 is located at the front cradle 61. The rear edge portion 92 and the rear edge portion 93 are located at the rear cradle 62 and the rear cradle 63, respectively. Similarly, the side edge portion 94 and the side edge portion 95 are located at the side cradle 64 and the side cradle 65, respectively.

[0099] An opening portion 96 is formed in the outer path defining portion 90. The opening portion 96 is formed between the rear edge portion 92 and the rear edge portion 93. The opening portion 96 is provided at a position corresponding to the gap 66 of the cradle unit 60.

[0100] The exhaust passage 110 is formed between the support unit 80 (the frame portion 81) and the lower case 31 using the inner path defining portion 70 and the outer path defining portion 90 configured as described above.

[0101] The exhaust passage 110 includes a front passage 111, a rear passage 112, a rear passage 113, a side passage 114, and a side passage 115.

[0102] The front passage 111 is located between the front edge portion 71 and the front edge portion 91. The rear passage 112 is located between the rear edge portion 72 and the rear edge portion 92. The rear passage 113 is located between the rear edge portion 72 and the rear edge portion 93. The side passage 114 is located between the left edge portion 73 and the side edge portion 94. The side passage 115 is located between the right edge portion 74 and the side edge portion 95.

[0103] In a state where the common panel 33 is installed to the lower case 31, an exhaust smoke space S surrounded by the inner path defining portion 70 is formed between the common panel 33 and the lower case 31. Further, as shown in Figure 10 , when the lower case 31 or the like is viewed from below, the region R1 overlaps the exhaust smoke space S.

[0104] The exhaust passage 110 communicates with the exhaust smoke space S through the openings 75, 76, 77, and 78. The exhaust passage 110 communicates with the outside through the opening 96.

[0105] Figure 11 A cross-sectional view along the XI-XI line of Figure 10 is shown. In the cross-section shown in Figure 11 , the support plate 81d and the support plate 84 in the support unit 80 are presented. Further, since the support plates 81a to 81c have the same structure as the support plate 81d, detailed description is omitted. In addition, since the support plates 82 and 83 have the same structure as the support plate 84, detailed description is omitted.

[0106] Here, in the related art electrical storage device, since the exhaust smoke space of the gas discharged from the safety valve provided at the lower surface of the electrical storage unit is formed below the electrical storage unit, when the load is input from below to the electrical storage device due to interference or the like between the electrical storage device and the road surface, there is a concern that the member forming the exhaust smoke space is damaged.

[0107] Therefore, in the present embodiment, the support plate 81d and the support plate 84 each have a panel connecting portion 81f and a panel connecting portion 87 that are connected to the common panel 33. The panel connecting portion 81f and the panel connecting portion 87 are each disposed below the power storage unit 10. Thereby, the length L in the Y direction of the beam portion 33a, which is a portion of the common panel 33 corresponding to between the panel connecting portion 81f and the panel connecting portion 87, can be made relatively small. As a result, the rigidity of the common panel 33 can be improved. Further, the beam portion 33a is disposed below the power storage unit 10.

[0108] Specifically, the panel connecting portion 81f and the panel connecting portion 87 are each connected to the common panel 33 by welding (spot welding). Thereby, no gap is formed between the panel connecting portion 81f (panel connecting portion 87) and the common panel 33, and thus it is possible to prevent the ejection of a material and gas and the like from the power storage unit 10 from passing below the panel connecting portion 81f (panel connecting portion 87). Further, each of the panel connecting portion 81f and the panel connecting portion 87 can be connected to the common panel 33 using an adhesive or the like, or can be brought into contact with the common panel 33 without being joined thereto. In addition, the panel connecting portion 81f and the panel connecting portion 87 are each formed in a flat surface shape along the common panel 33.

[0109] Referring back to Figure 9 , the panel connecting portion 81f is formed in a frame shape along the shape of the frame portion 81. Specifically, the panel connecting portion 81f of each of the support plate 81c and the support plate 81d extends in the direction in which the plurality of power storage units 10 are arranged (X direction). In addition, the panel connecting portion 81f of each of the support plate 81a and the support plate 81b extends in the Y direction. The panel connecting portion 87 extends in the X direction. Further, the panel connecting portion 81f of each of the support plate 81c and the support plate 81d and the panel connecting portion 87 of each of the support plate 82 to 84 are examples of the "unit arrangement direction extending portion" of the present disclosure.

[0110] In addition, each of the support plate 82 to 84 has a pair of panel connecting portions 87. One of the pair of panel connecting portions 87 is disposed at an end portion on the Y1 side of each of the support plate 82 to 84. The other of the pair of panel connecting portions 87 is disposed at an end portion on the Y2 side of each of the support plate 82 to 84.

[0111] Hereinafter, the panel connecting portion 81f and the panel connecting portion 87 that are disposed below the same power storage unit 10 will be described. Further, the panel connecting portion 81f and the panel connecting portion 87 that are disposed below the same power storage unit 10 are each an example of the "first connecting portion" and the "second connecting portion" of the present disclosure.

[0112] In addition, as shown in Figure 11 , the panel connecting portion 81f and the panel connecting portion 87 that are disposed below the same power storage unit 10 are each disposed in a position corresponding to the beam portion 33a of the common panel 33.Figure 2 ) Each of the lower sides is provided with a panel connecting portion 81f and a panel connecting portion 87. On the other hand, the power storage stack 102 and the power storage stack 103 (the power storage stack 102 and the power storage stack 103) are arranged in the Y direction with the panel connecting portion 81f and the panel connecting portion 87 interposed therebetween. Figure 2 ) Each of the lower sides is provided with two panel connecting portions 87.

[0113] Referring again to Figure 11 , the panel connecting portion 81f and the panel connecting portion 87 are arranged separately in the Y direction. The exhaust hole 31e of the lower case 31 is arranged in the Y direction between the panel connecting portion 81f and the panel connecting portion 87 (the center).

[0114] The power storage unit 10 is formed in a long strip in the Y direction in which the panel connecting portion 81f and the panel connecting portion 87 are arranged. In other words, the panel connecting portion 81f and the panel connecting portion 87 are arranged in the long side direction of the power storage unit 10.

[0115] The panel connecting portion 81f is provided at a position adjacent to the right edge portion 74 of the inner path defining portion 70 in the Y direction. The panel connecting portion 81f is provided on the Y2 side of the right edge portion 74. The panel connecting portion 81f extends along the inner path defining portion 70.

[0116] The support plate 81d has a panel separating portion 81g and a connecting portion 81h in addition to the panel connecting portion 81f. The panel separating portion 81g is arranged separately from the common panel 33 above the common panel 33. The side edge portion 95 of the outer path defining portion 90 is formed by bringing the panel separating portion 81g into contact (fastening connection) with the side portion bracket 65. The panel separating portion 81g is formed by a flat surface extending in parallel with the common panel 33. The panel separating portion 81g is provided at a position on the Y2 side (a direction away from the exhaust hole 31e) from the panel connecting portion 81f. Further, the panel separating portion 81g is an example of the "portion other than the panel connecting portion" of the present disclosure.

[0117] The connecting portion 81h connects the panel connecting portion 81f and the panel separating portion 81g. Specifically, the connecting portion 81h connects the end portion on the Y2 side of the panel connecting portion 81f and the end portion on the Y1 side of the panel separating portion 81g. The connecting portion 81h is inclined with respect to the common panel 33. Further, the panel separating portion 81g and the connecting portion 81h each extend along the panel connecting portion 81f.

[0118] The support plate 84 has a panel separating portion 88 and a pair of connecting portions 89 in addition to the pair of panel connecting portions 87. The panel separating portion 88 is arranged separately from the common panel 33 above the common panel 33. The panel separating portion 88 is formed by a flat surface extending in parallel with the common panel 33. The panel separating portion 88 is provided at a position in the Z direction from the adjacent power storage stack (the power storage stack 102 and the power storage stack 103) interposed between the pair of panel connecting portions 87. Figure 11The panel separation portion 88 is provided at a position where the space between the power storage stack 101 and the power storage stack 102 overlaps with each other. The panel separation portion 88 is provided at a position apart from the panel connection portion 87 in a direction in which the exhaust hole 31e is separated. Further, the panel separation portion 88 is an example of the "portion other than the panel connection portion" of the present disclosure.

[0119] The pair of connection portions 89 respectively connect the panel connection portion 87 and the panel separation portion 88. Specifically, one of the pair of connection portions 89 connects one of the pair of panel connection portions 87 and the panel separation portion 88. The other of the pair of connection portions 89 connects the other of the pair of panel connection portions 87 and the panel separation portion 88. The pair of connection portions 89 are respectively inclined with respect to the common panel 33. Further, the panel separation portion 88 and the pair of connection portions 89 respectively extend in the X direction along the panel connection portion 87.

[0120] The power storage device 100 includes the spacer 120 and the spacer 121. The spacer 120 is disposed in a gap formed between the panel separation portion 81g and the common panel 33. The spacer 120 supports the support plate 81d (the frame portion 81) from below. The spacer 120 is disposed on the Y2 side (the side opposite the exhaust hole 31e) with respect to the panel connection portion 81f. The spacer 120 has a shape (a frame shape) along the frame portion 81 (see FIG. 6). Figure 12 Further, the spacer 120 can also be formed in a frame shape by combining a plurality of members extending in a straight line. In addition, the spacer 120 and the spacer 121 are each an example of the "supporting member" of the present disclosure.

[0121] The spacer 121 is disposed in a gap formed between the panel separation portion 88 and the common panel 33. The spacer 121 supports the support plate 84 (and the support plates 82 and 83) from below. The spacer 121 is disposed below each of the support plates 82 to 84. The spacer 121 respectively extends in the X direction along the support plates 82 to 84 (see FIG. 8). Figure 12 The spacer 121 is disposed on the side opposite the exhaust hole 31e with respect to the panel connection portion 87.

[0122] The spacer 120 is adhered to each of the panel separation portion 81g and the common panel 33 with an unillustrated adhesive member (for example, an adhesive tape) disposed on the upper surface and the lower surface of the spacer 120. The spacer 121 is adhered to each of the panel separation portion 88 and the common panel 33 with an unillustrated adhesive member (for example, an adhesive tape) disposed on the upper surface and the lower surface of the spacer 121.

[0123] The spacer 120 and the spacer 121 are each formed of, for example, a foamed resin.

[0124] The gap between the common panel 33 and the support unit 80 (panel separation portions 81g, 88) is filled by the spacers 120 and 121, respectively. Moreover, the common panel 33 and the support unit 80 (panel separation portions 81g, 88) are connected. Thus, since the integrity of the common panel 33 and the support unit 80 can be improved, the rigidity of the entire support unit 80 and common panel 33 (the rigidity of the integrity) can be improved.

[0125] Referring again to Figure 11 , the inner path defining portion 70 (the right portion 74 shown in Figure 11 ) has a main portion 70a and an adhesive portion 70b. The main portion 70a is formed of, for example, silicone resin. The main portion 70a is disposed on the common panel 33.

[0126] The adhesive portion 70b is disposed on the upper surface of the main portion 70a. The adhesive portion 70b is in contact with the cooler 20 (the flow passage 24A in Figure 11 ). The adhesive portion 70b can be an adhesive tape having an adhesive layer on both surfaces, and is adhered to the cooler 20 and the main portion 70a, respectively. Thus, the inner path defining portion 70 can be stably fixed to the common panel 33, and the passage of the spatter and gas and the like from the power storage unit 10 above and below the inner path defining portion 70 can be suppressed. In addition, the portions of the inner path defining portion 70 other than the right portion 74 also have the same structure as the right portion 74.

[0127] The bottom plate 31c of the lower case 31 includes the bottom main body 31j in which the power storage unit 10 is disposed, and the protruding portions 31k. In addition, the protruding portions 31k are formed at intervals in the Y direction. Each of the protruding portions 31k is formed so as to extend in the X direction. The protruding portions 31k are formed so as to protrude downward from the bottom main body 31j. The lower end portions of the protruding portions 31k are positioned in the holes 28 formed in the cooler 20. The smoke discharge holes 31e are formed in the lower end portions of the protruding portions 31k.

[0128] A thermally conductive adhesive 130 is disposed between the bottom main body 31j and the cooler 20. The thermally conductive adhesive 130 adheres the bottom main body 31j and the cooler 20. In addition, a thermally conductive adhesive 131 is disposed between the bottom main body 31j and the lower surface 6 of the power storage unit 10. The thermally conductive adhesive 131 adheres the bottom main body 31j and the power storage unit 10. The thermally conductive adhesives 130 and 131 extend in the X direction, respectively.

[0129] The electricity storage device 100 is provided with a heat insulating plate 140 and a heat insulating plate 141. The heat insulating plate 140 is arranged between the hole 28 of the cooler 20 and the safety valve SV of the electricity storage unit 10. Specifically, the heat insulating plate 140 is provided in the space between the protruding portion 31k and the lower surface 6 of the electricity storage unit 10, and is arranged at the lower end portion of the protruding portion 31k. The heat insulating plate 140 is composed of, for example, mica which is solidified by heat pressing a natural inorganic mineral. The heat insulating plate 140 is arranged so as to cover the plurality of smoke discharging holes 31e arranged in the X direction from above.

[0130] The heat insulating plate 141 is provided on the portion of the common panel 33 which faces the safety valve SV. The heat insulating plate 141 is formed of mica or the like. The heat insulating plate 141 is formed so as to extend in the X direction. The heat insulating plate 141 is located below the plurality of smoke discharging holes 31e arranged in the X direction.

[0131] The electricity storage device 100 is provided with a cross member 150. The cross member 150 is connected at the portion between a pair of electricity storage stacks adjacent to each other in the bottom plate 31c of the lower case 31. The cross member 150 is supported from below by the panel separation portion 88 of the support plate 84 (and the support plates 82, 83). The cross member 150 extends in the X direction. The cross member 150 is connected with the peripheral wall 31d. The cross member 150 can also be connected with a pair of first frames 921 (not shown) via brackets. Figure 2 ).

[0132] Figure 13 is an enlarged view of the vicinity of the panel connecting portion 81f. The support plate 81d (and the support plates 81a to 81c) includes a spatter catching portion 81i. The spatter catching portion 81i catches spatter discharged from the smoke discharging hole 31e. The spatter catching portion 81i is provided outside the inner side path defining portion 70. In the position shown in Figure 13 , the spatter catching portion 81i is provided on the Y2 side (the side opposite to the smoke discharging hole 31e) of the right side portion 74.

[0133] The spatter catching portion 81i is connected with the end portion on the Y1 side of the panel connecting portion 81f. The spatter catching portion 81i has a standing portion 81j and a flange portion 81k. The standing portion 81j extends from the end portion on the Y1 side of the panel connecting portion 81f to the Z1 side. The flange portion 81k protrudes from the upper end portion 81l of the standing portion 81j to the inner side path defining portion 70 side (the Y1 side). The spatter catching portion 81i has an L-letter shape. Furthermore, the shape of the spatter catching portion 81i is not limited to the above example. In addition, the standing portion 81j and the flange portion 81k are each an example of the "first portion" and the "second portion" of the present disclosure. In addition, the upper end portion 81l is an example of the "upper portion" of the present disclosure.

[0134] Furthermore, in Figure 13In the present embodiment, the flange portion 81k is separated from the inner path defining portion 70 (the right side portion 74), but the flange portion 81k can also be in contact with the inner path defining portion 70 (the right side portion 74). In addition, in the present embodiment, the upper end of the ejecta trapping portion 81i (the flange portion 81k) is positioned lower than the cooler 20, but the ejecta trapping portion 81i can also reach the height of the lower end of the cooler 20. Figure 13 In the present embodiment, the flange portion 81k is separated from the inner path defining portion 70 (the right side portion 74), but the flange portion 81k can also be in contact with the inner path defining portion 70 (the right side portion 74). In addition, in the present embodiment, the upper end of the ejecta trapping portion 81i (the flange portion 81k) is positioned lower than the cooler 20, but the ejecta trapping portion 81i can also reach the height of the lower end of the cooler 20.

[0135] Figure 14 is a partial enlarged view showing the structure in the vicinity of the protruding portion 31k. The protruding portion 31k includes a bottom plate 31l and side walls 31m, 31n. The side walls 31m and 31n are formed so as to connect the bottom plate 31l and the bottom main body 31j. The smoke exhaust hole 31e is formed in the bottom plate 31l.

[0136] The electricity storage device 100 is provided with waterproof adhesives 160, 161 and a waterproof sheet 170. The waterproof adhesives 160 and 161 are disposed on the upper surface of the bottom plate 31l and are formed so as to extend in the X direction. The waterproof adhesives 160 and 161 are disposed at intervals in the Y direction. The smoke exhaust hole 31e is disposed between the waterproof adhesives 160 and 161 when viewed from above.

[0137] The heat insulating plate 140 has a support portion 140a, a support portion 140b, and a blocking plate 140c. The support portion 140a is disposed on the upper surface of the waterproof adhesive 160. The support portion 140b is disposed on the upper surface of the waterproof adhesive 161. The blocking plate 140c is disposed so as to cover the support portion 140a and the support portion 140b.

[0138] The waterproof adhesives 160, 161 and the heat insulating plate 140 block the smoke exhaust hole 31e on the upper surface side of the protruding portion 31k. Furthermore, the waterproof adhesives 160, 161 and the heat insulating plate 140 are formed so as to extend in the X direction and block a plurality of smoke exhaust holes 31e arranged in the X direction.

[0139] The waterproof sheet 170 is disposed on the lower surface of the protruding portion 31k and blocks the smoke exhaust hole 31e. Furthermore, the waterproof sheet 170 is formed so as to extend in the X direction and block a plurality of smoke exhaust holes 31e arranged in the X direction.

[0140] Figure 15 is a partial enlarged view showing the structure in the vicinity of the beam member 150. The bottom main body 31j includes a support portion 31o that supports the beam member 150 from below. The support portion 31o is provided so as to extend in the X direction along the beam member 150. In addition, as shown in Figure 15 , the support portion 31o is formed so as to extend in the Y direction.

[0141] The support portion 310 is provided above the panel separation portion 88. A spacer 180, an adhesive 181, and an adhesive 182 are provided between the support portion 310 and the panel separation portion 88. The spacer 180, the adhesive 181, and the adhesive 182 are arranged in the Y direction. The spacer 180 is provided between the adhesive 181 and the adhesive 182. The spacer 180 is in contact with a central portion of the support portion 310 in the Y direction. The adhesive 181 and the adhesive 182 are in contact with end portions of the support portion 310 on the Y1 side and the Y2 side, respectively. The spacer 180, the adhesive 181, and the adhesive 182 are each provided so as to extend in the X direction. Further, the spacer 180 is formed of, for example, a foamed resin.

[0142] In the power storage device 100 described above, the support unit 80 has the panel connecting portions (81f, 87) connected to the common panel 33, and the panel connecting portions (81f, 87) are arranged below the power storage unit 10. Thus, the portion (beam portion 33a) of the common panel 33 below the power storage unit 10 is stably held by the panel connecting portion 81f and the panel connecting portion 87. Therefore, since the rigidity of the common panel 33 can be improved, it is possible to suppress breakage of the common panel 33 due to input of load from below. In addition, by providing the panel connecting portions (81f, 87) below the power storage unit 10, it is possible to suppress transmission of input of load from below to the power storage unit 10.

[0143] [Modified Example]

[0144] In the above embodiment, an example in which the support unit 80 includes the frame portion 81 and the support plates (82 to 84) is shown, but the present disclosure is not limited thereto. Only either one of the frame portion 81 and the support plates (82 to 84) can be provided.

[0145] In the above embodiment, an example in which the ejecta catching portion 81i is provided only in the frame portion 81 is shown, but the present disclosure is not limited thereto. It can also be that the ejecta catching portion 81i is provided in the support plates (82 to 84).

[0146] In the above embodiment, an example in which the spacers (120, 121) are provided in the gap formed between the support unit 80 and the common panel 33 is shown, but the present disclosure is not limited thereto. For example, a gap can not be formed between the support unit 80 and the common panel 33.

[0147] In the above embodiment, an example in which the panel connecting portion 81f and the panel connecting portion 87 are arranged in the long side direction of the power storage unit 10 is shown, but the present disclosure is not limited thereto. The panel connecting portion 81f and the panel connecting portion 87 can also be arranged in the short side direction of the power storage unit 10.

[0148] In the above-described embodiment, an example in which the flange portion 81k of the spray capturing portion 81i is connected to the upper end portion 81l of the standing portion 81j is shown, but the present disclosure is not limited thereto. The flange portion 81k can also be connected to a portion of the upper portion of the standing portion 81j that is lower than the upper end portion 81l.

[0149] Embodiments of the present application have been described, but it should be considered that the disclosed embodiments are illustrative in all respects, and are not restrictive. The scope of the present application is shown by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

Claims

1. An energy storage device, wherein, The energy storage device includes at least one energy storage unit and a frame. The at least one energy storage unit includes a lower surface on which a safety valve is disposed. The frame includes: A lower housing that supports the at least one energy storage unit from below; A common panel is disposed below the lower housing, forming a space between the common panel and the bottom surface of the lower housing; as well as A lower housing support plate is disposed between the lower housing and the common panel to support the lower housing. A through hole is formed on the bottom surface of the lower housing, and the through hole is located at a position overlapping with the safety valve of the at least one energy storage unit. The lower housing support plate has a panel connecting portion, which is connected to the common panel. The panel connection portion is disposed below the at least one energy storage unit.

2. The energy storage device according to claim 1, wherein, The energy storage device further includes an enclosure member disposed in the space between the common panel and the bottom surface of the lower housing, and enclosing the area on the bottom surface of the lower housing where the through hole is provided. The lower housing support plate includes a jet collection section located outside the surrounding member.

3. The energy storage device according to claim 2, wherein, The projectile collection unit has: The first part extends upward from the panel connection portion; as well as The second part protrudes from the upper part of the first part toward the side of the surrounding member.

4. The energy storage device according to any one of claims 1 to 3, wherein, The energy storage device also includes a support member disposed in the gap between the portion of the lower housing support plate that is different from the panel connection portion and the common panel, and supports the lower housing support plate from below.

5. The energy storage device according to claim 4, wherein, The support member is positioned on the side opposite to the through hole relative to the panel connection portion.

6. The energy storage device according to any one of claims 1 to 3, wherein, The panel connection portion includes a first connection portion and a second connection portion.

7. The energy storage device according to claim 6, wherein, The at least one energy storage unit is formed as a strip in the direction of the connection arrangement of the first connection and the second connection.

8. The energy storage device according to any one of claims 1 to 3, wherein, The at least one energy storage unit comprises a plurality of energy storage units, which are arranged such that the safety valves are arranged in a plurality of manner along the unit arrangement direction. The panel connection portion includes a unit arrangement direction extension portion, which extends along the plurality of energy storage units in the unit arrangement direction.

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