Power storage device

Abstract

To provide a power storage device capable of preventing adjacent power storage modules from being short-circuited by debris discharged from the power storage modules.SOLUTION: Power storage device 3 includes a housing case 10 and at least one power storage module 120. Housing case 10 includes a lower case 12. The lower case 12 includes a bottom plate 13 and a wall 14. The wall portion 14 and the bottom plate 13 define housing portions 61 to 69 that individually house the power storage modules 120. The power storage module 120 is housed in the housing portions 61 to 69. The electric storage module 120 has a bottom surface 123. A smoke exhaust valve 126 is formed in the bottom surface 123. The bottom plate 13 has a main surface 13a facing the power storage module side, and the main surface 13a has a facing region 13b facing the bottom surface 123. The bottom plate 13 is deformed so as to be separated from the power storage module 120 by the exhaust gas ejected from the exhaust gas valve 126.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2022-165717 (Patent Document 1) discloses an electricity storage device including an electricity storage module and a lower case. The lower case includes a flat bottom plate and a wall portion extending upward from the bottom plate. The electricity storage module is disposed on the bottom plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-165717 Summary of the Invention [Problem to be solved by the invention]

[0004] The energy storage modules disclosed in Patent Document 1 are arranged on a flat bottom plate, which may cause adjacent energy storage modules to short-circuit due to the accumulation of debris discharged from the energy storage modules.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device that can prevent adjacent energy storage modules from short-circuiting due to debris emitted from the energy storage modules. [Means for solving the problem]

[0006] A first aspect of the present disclosure provides an energy storage device mounted on a vehicle, the energy storage device comprising: a storage case and at least one energy storage module; the storage case including an upper cover and a lower case; the lower case having a bottom plate and a wall portion formed to rise upward from the bottom plate; the wall portion and the bottom plate defining a storage section for individually accommodating the energy storage modules; the energy storage modules being accommodated in the storage section and having a bottom surface facing the bottom plate; a smoke exhaust valve formed on the bottom surface; the bottom plate having a main surface facing the energy storage module; the main surface having an opposing area facing the bottom surface; and the bottom plate being deformed so as to move away from the energy storage module due to the emission of smoke from the smoke exhaust valve.

[0007] 2. The energy storage device according to claim 1, wherein the bottom plate of the energy storage device according to the first aspect of the present disclosure has an extension portion formed in the opposing region, the extension portion being formed line-symmetrically with respect to a line passing through the center of the opposing region in the width direction of the vehicle and line-symmetrically with respect to a line passing through the center of the opposing region in the length direction of the vehicle, and having at least one rib wave shape formed in an annular shape.

[0008] A first aspect of the present disclosure provides an energy storage device mounted on a vehicle, the energy storage device including an accommodation case and at least one energy storage module, the accommodation case including an upper cover and a lower case, the lower case having a bottom plate and a wall portion formed to rise upward from the bottom plate, the wall portion and the bottom plate defining an accommodation section for individually accommodating the energy storage modules, the energy storage modules being accommodated in the accommodation section and having a bottom surface facing the bottom plate, a smoke exhaust valve being formed on the bottom surface, the bottom plate having a main surface facing the energy storage module, the main surface having an opposing area facing the bottom surface, and a recess formed in the opposing area of ​​the bottom plate so as to be spaced apart from the energy storage module.

[0009] The wall portion of the energy storage device mounted on a vehicle according to the first aspect of the present disclosure includes a first defining wall and a second defining wall spaced apart from the first defining wall, the accommodating case further has a reinforcing member formed to connect the first defining wall and the second defining wall, and the energy storage module is arranged on the reinforcing member.

[0010] The reinforcing member of the power storage device mounted on a vehicle according to the first aspect of the present disclosure is joined to the first limiting wall and the second limiting wall, and the bottom plate is fixed to the wall portion. [Effects of the Invention]

[0011] According to the power storage device according to the present disclosure, it is possible to prevent adjacent power storage modules from short-circuiting due to debris discharged from the power storage modules. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view showing a vehicle equipped with a power storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is an exploded perspective view of the power storage device according to the embodiment of the present disclosure. [Figure 3] 1 is a plan view of a power storage device according to an embodiment of the present disclosure; [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3. [Figure 5] 5 is a cross-sectional view of the bottom plate of the electricity storage device shown in FIG. 4 after deformation. FIG. [Figure 6] FIG. 10 is a plan view of the electricity storage device according to Modification 1 of the present embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6. [Figure 8] FIG. 10 is a plan view of a power storage device according to a second modification of the present embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0014] 1 is a side view that schematically shows a vehicle equipped with a power storage device according to this embodiment. The up-down direction H shown in FIG. 1 indicates the up-down direction of the vehicle 1. The width direction W indicates the width direction of the vehicle 1. The front-rear direction D indicates the front-rear direction of the vehicle 1.

[0015] The vehicle 1 includes a vehicle body 2 and a power storage device 3. The vehicle 1 includes, for example, a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or a fuel cell electric vehicle (FCEV). The power storage device 3 is mounted on a lower portion of the vehicle body 2.

[0016] FIG. 2 is an exploded perspective view of the power storage device according to the embodiment of the present disclosure.

[0017] The electricity storage device 3 includes a storage case 10 and an electricity storage assembly 100.

[0018] The housing case 10 includes an upper cover 11 and a lower case 12. The housing case 10 defines a housing space R defined by the upper cover 11 and the lower case 12.

[0019] The upper cover 11 is formed to cover a lower case 12 that is formed to open upward.

[0020] The lower case 12 includes a bottom plate 13 and a wall portion 14. The wall portion 14 is formed to rise upward from the bottom plate 13.

[0021] The power storage assembly 100 includes power storage units 101 to 109 and cooling devices 201 to 203. The power storage assembly 100 is accommodated in an accommodating space R.

[0022] The power storage units 101 to 103, the power storage units 104 to 106, and the power storage units 107 to 109 are arranged at intervals in the width direction W. The power storage units 101, 104, and 107, the power storage units 102, 105, and 108, and the power storage units 103, 106, and 109 are arranged at intervals in the front-rear direction D, respectively.

[0023] Each of the power storage units 101 to 109 is formed of a pair of power storage modules. Since the power storage units 101 to 109 have substantially the same configuration, the power storage unit 103 will be mainly described.

[0024] The power storage unit 103 has a power storage module 110 and a power storage module 120. The power storage module 110 and the power storage module 120 are arranged in the vertical direction H with a cooling device 201 sandwiched therebetween. Compared to the power storage device 110, the power storage module 120 is arranged closer to a bottom plate 13, which will be described later.

[0025] The energy storage module 110 has a module case 111, a positive terminal 114, and a negative terminal 115. The module case 111 houses energy storage cells 117 (see FIG. 4 ). The module case 111 has a first end face 112 and a second end face arranged in a front-rear direction D, and an upper face 113 and a lower face arranged in a vertical direction H. The positive terminal 114 and the negative terminal 115 are provided on the first end face 112. The positive terminal 114 and the negative terminal 115 are arranged at an interval in the width direction W. A smoke exhaust valve 116 is formed on the upper face 113. The smoke exhaust valve 116 is, for example, a check valve. Gas generated within the energy storage module 110 is exhausted from the smoke exhaust valve 116.

[0026] The energy storage module 120 has a module case 121, a positive electrode terminal 124, and a negative electrode terminal 125. The module case 121 houses the energy storage cells 118 (see FIG. 4 ). The module case 121 has a first end face 122 and a second end face arranged in the front-rear direction D, and a top face and a bottom face 123 arranged in the up-down direction H. The positive electrode terminal 124 and the negative electrode terminal 125 are provided on the first end face 122. The positive electrode terminal 124 and the negative electrode terminal 125 are arranged at an interval in the width direction W. The bottom face 123 is a face facing the bottom plate 13. A smoke exhaust valve 126 is formed on the bottom face 123. The smoke exhaust valve 126 is, for example, a check valve. Gas generated inside the energy storage module 120 is exhausted from the smoke exhaust valve 126.

[0027] The positive electrode terminal 124 of the power storage module 120 is arranged to be aligned with the negative electrode terminal 115 of the power storage module 110 in the vertical direction H. The negative electrode terminal 125 of the power storage module 120 is arranged to be aligned with the positive electrode terminal 114 of the power storage module 110 in the vertical direction H.

[0028] The cooling device 201 is formed to extend in the width direction W. In the power storage unit 103, the cooling device 201 is disposed between the power storage module 110 and the power storage module 120. The same is true for the power storage unit 102 and the power storage unit 103.

[0029] The cooling device 202 is formed to extend in the width direction W. In the power storage unit 104, the cooling device 202 is disposed between the power storage module 110 and the power storage module 120. The same is true for the power storage unit 105 and the power storage unit 106.

[0030] Cooling device 203 is formed to extend in width direction W. In power storage unit 107, cooling device 203 is disposed between power storage module 110 and power storage module 120. The same is true for power storage unit 108 and power storage unit 109.

[0031] The cooling device 201 is connected to the cooling device 203 with the cooling device 202 sandwiched therebetween in the front-rear direction D.

[0032] 3 is a plan view of the electricity storage device, in which the upper cover 11 and the electricity storage assembly 100 are omitted.

[0033] The wall portion 14 of the lower case 12 is fixed to the bottom plate 13. The wall portion 14 of the lower case 12 has a peripheral wall portion 20 and a partition wall 30.

[0034] The peripheral wall portion 20 has a first side wall 21, a second side wall 22, a first end wall 23, and a second end wall 24. The first side wall 21 and the second side wall 22 are arranged at an interval in the width direction W. The first end wall 23 and the second end wall 24 are each formed to extend in the front-rear direction D and connect the first side wall 21 and the second side wall 22. The first end wall 23 and the second end wall 24 are arranged at an interval in the front-rear direction D.

[0035] The partition wall 30 has a main wall 40 and a dependent wall 50. The main wall 40 is disposed between a first end wall 23 and a second end wall 24 arranged in the front-rear direction D. The main wall 40 has a first main wall 41, a second main wall 42, a third main wall 43, and a fourth main wall 44. The first main wall 41, the second main wall 42, the third main wall 43, and the fourth main wall 44 are arranged at intervals in the front-rear direction D and are formed to connect the first side wall 21 and the second side wall 22, respectively. The first main wall 41 is disposed closer to the first end wall 23 than the fourth main wall 44. The fourth main wall 44 is disposed closer to the second end wall 24 than the first main wall 41.

[0036] The dependent wall 50 is disposed between the first side wall 21 and the second side wall 22, which are arranged in the width direction W. The dependent wall 50 is disposed at a distance from the first side wall 21 and the second side wall 22. The dependent wall 50 includes a first dependent wall 51, a second dependent wall 52, a third dependent wall 53, a fourth dependent wall 54, a fifth dependent wall 55, and a sixth dependent wall 56.

[0037] The first minor wall 51 and the second minor wall 52 connect the first major wall 41 and the second major wall 42, respectively. The first minor wall 51 and the second minor wall 52 are arranged at an interval in the width direction W. The first minor wall 51 is disposed closer to the first side wall 21 than the second minor wall 52. The second minor wall 52 is disposed closer to the second side wall 22 than the first minor wall 51.

[0038] The third minor wall 53 and the fourth minor wall 54 connect the second major wall 42 and the third major wall 43, respectively. The third minor wall 53 and the fourth minor wall 54 are arranged at an interval in the width direction W. The third minor wall 53 is positioned closer to the first side wall 21 than the fourth minor wall 54. The fourth minor wall 54 is positioned closer to the second side wall 22 than the third minor wall 53.

[0039] The fifth minor wall 55 and the sixth minor wall 56 connect the third major wall 43 and the fourth major wall 44, respectively. The fifth minor wall 55 and the sixth minor wall 56 are arranged at an interval in the width direction W. The fifth minor wall 55 is disposed closer to the first side wall 21 than the sixth minor wall 56. The sixth minor wall 56 is disposed closer to the second side wall 22 than the fifth minor wall 55.

[0040] An accommodation space 60 is formed in the lower case 12. The accommodation space 60 includes accommodation sections 61 to 69 that individually accommodate the power storage modules 120 of the power storage units 101 to 109. Each of the accommodation sections 61 to 69 is defined by a wall section 14 and a bottom plate 13.

[0041] The accommodating section 61 is a space defined by the bottom plate 13, the first side wall 21, the first main wall 41, the second main wall 42, and the first minor wall 51. The accommodating section 61 accommodates the power storage module 120 of the power storage unit 101. The accommodating section 62 is a space defined by the bottom plate 13, the first main wall 41, the second main wall 42, the first minor wall 51, and the second minor wall 52. The accommodating section 62 accommodates the power storage module 120 of the power storage unit 102. The accommodating section 63 is a space defined by the bottom plate 13, the first main wall 41, the second main wall 42, the second minor wall 52, and the second side wall 22. The accommodating section 63 accommodates the power storage module 120 of the power storage unit 103. The accommodating section 64 is a space defined by the bottom plate 13, the first side wall 21, the second main wall 42, the third main wall 43, and the third minor wall 53. The accommodating section 64 accommodates the power storage module 120 of the power storage unit 104. The accommodating section 65 is a space defined by the bottom plate 13, the second main wall 42, the third main wall 43, the third minor wall 53, and the fourth minor wall 54. The accommodating section 65 accommodates the power storage module 120 of the power storage unit 105. The accommodating section 66 is a space defined by the bottom plate 13, the second main wall 42, the third main wall 43, the fourth minor wall 54, and the second side wall 22. The accommodating section 66 accommodates the power storage module 120 of the power storage unit 103. The accommodating section 67 is a space defined by the bottom plate 13, the first side wall 21, the third main wall 43, the fourth main wall 44, and the fifth minor wall 55. The accommodating section 67 accommodates the power storage module 120 of the power storage unit 107. The accommodating section 68 is a space defined by the bottom plate 13, the third main wall 43, the fourth main wall 44, the fifth minor wall 55, and the sixth minor wall 56. The accommodating section 68 accommodates the power storage module 120 of the power storage unit 105. The accommodating section 69 is a space defined by the bottom plate 13, the third main wall 43, the fourth main wall 44, the sixth minor wall 56, and the second side wall 22. The accommodating section 69 accommodates the power storage module 120 of the power storage unit 103.

[0042] An extension section 70 is formed in each of the storage sections 61 to 69 on the bottom plate 13. Details will be described below. Note that the storage sections 61 to 69 have substantially the same configuration, so the extension section 70 in the storage section 61 will mainly be described.

[0043] An extension portion 70 is formed on the bottom plate 13 that defines the housing portion 61 that houses the power storage module 120 of the power storage unit 101. More specifically, the bottom plate 13 has a main surface 13a. The main surface 13a is the surface of the bottom plate 13 that faces the power storage device 120. The main surface 13a has a facing region 13b. The facing region 13b is an area that faces a bottom surface 123 of the power storage module 120 housed in the housing portion 61, as shown in FIG. 4 . The extension portion 70 is formed in the facing region 13b of the bottom plate 13. The extension portion 70 has grooves 71 to 73. When the bottom plate 13 is viewed from a position away from the bottom plate 13 in the up-down direction H, the grooves 71 to 73 are each formed in a ring shape centered on a center O of the facing region 13b. Furthermore, the groove 71 is formed inside the groove 72, and the groove 72 is formed inside the groove 73.

[0044] Here, imaginary line P1 in FIG. 3 is a line extending in the width direction W that passes through the center O of the facing region 13b of the storage sections 61 to 63. Imaginary line P2 is a line extending in the width direction W that passes through the center O of the facing region 13b of the storage sections 64 to 66. Imaginary line P3 is a line extending in the width direction W that passes through the center O of the facing region 13b of the storage sections 67 to 69. Imaginary line P4 is a line extending in the front-rear direction D that passes through the center O of the facing region 13b of the storage sections 61, 64, and 67. Imaginary line P5 is a line extending in the front-rear direction D that passes through the center O of the facing region 13b of each of the storage sections 62, 65, and 68. Imaginary line P6 is a line extending in the front-rear direction D that passes through the center O of the facing region 13b of the storage sections 63, 66, and 69.

[0045] The grooves 71 to 73 of the extension portion 70 in the accommodation portion 61 are formed line-symmetrically with respect to the imaginary line P1, and are also formed line-symmetrically with respect to the imaginary line P4.

[0046] Similarly, the grooves 71-73 in the storage portion 62 are each formed symmetrically with respect to the imaginary line P1 and also formed symmetrically with respect to the imaginary line P5. The grooves 71-73 in the storage portion 63 are each formed symmetrically with respect to the imaginary line P1 and also formed symmetrically with respect to the imaginary line P6. The grooves 71-73 in the storage portion 64 are each formed symmetrically with respect to the imaginary line P2 and also formed symmetrically with respect to the imaginary line P4. The grooves 71-73 in the storage portion 65 are each formed symmetrically with respect to the imaginary line P2 and also formed symmetrically with respect to the imaginary line P5. The grooves 71-73 in the storage portion 66 are each formed symmetrically with respect to the imaginary line P3 and also formed symmetrically with respect to the imaginary line P6. The grooves 71-73 in the storage portion 67 are each formed symmetrically with respect to the imaginary line P3 and also formed symmetrically with respect to the imaginary line P4. The grooves 71 to 73 in the storage portion 68 are formed line-symmetrically with respect to the imaginary line P3 and are also formed line-symmetrically with respect to the imaginary line P5. The grooves 71 to 73 in the storage portion 69 are formed line-symmetrically with respect to the imaginary line P3 and are also formed line-symmetrically with respect to the imaginary line P6.

[0047] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

[0048] The power storage module 110 has a power storage cell 117. The power storage module 120 has a power storage cell 118. The power storage module 120 has a bottom surface 123. The bottom surface 123 is a surface facing the bottom plate 13. A smoke vent valve 126 is formed on the bottom surface 123 of the power storage module 120. The smoke vent valve 126 faces the facing region 13b.

[0049] An extension portion 70 is formed in the facing region 13b of the bottom plate 13. The extension portion 70 has grooves 71 to 73. When the cross section of the grooves 71 to 73 is viewed in plan from a position away from the IV-IV cross section in the front-rear direction D, the grooves 71 to 73 are each formed in a rib-like waveform that protrudes in the opposite direction from the energy storage module 120 in the up-down direction H with respect to the main surface 13a of the bottom plate 13.

[0050] The storage case 10 of the energy storage device 3 in the above embodiment houses energy storage units 101 to 109 formed by arranging energy storage modules 110, 120 in the up-down direction H. A smoke exhaust valve 126 is formed on the bottom surface 123 of the energy storage module 120. An extension portion 70 is formed on the bottom plate 13 in an opposing region 13b that faces the bottom surface 123. Grooves 71 to 73 that form the extension portion 70 are formed in a ribbed waveform.

[0051] FIG. 5 is a cross-sectional view of the bottom plate of the energy storage device shown in FIG. 4 after deformation. This configuration can encourage the bottom plate 13 to deform into the configuration shown in FIG. 5 when a downward load is applied to the facing region 13b. More specifically, when flue gas is ejected from the smoke vent valve 126, the total pressure of the flue gas, particularly the dynamic pressure, applies a load to the facing region 13b in the opposite direction to the energy storage module 120 relative to the bottom plate 13. As a result, the extension section 70 extends, and the bottom plate 13 in the facing region 13b deforms so as to move away from the energy storage module 120. That is, a gap g1 is generated between the bottom surface 123 of the energy storage module 120 and the bottom plate 13. The flue gas discharged from the smoke vent valve 126 contains debris and electrolyte. The debris and electrolyte contained in the flue gas discharged from the smoke vent valve 126 of the energy storage module 120 accumulate in the gap g1. This makes it possible to prevent a short circuit between the positive electrode terminal 124 of the power storage module 120 and the negative electrode terminal 115 of the power storage module 110, which are arranged in the up-down direction H, for example.

[0052] In the above embodiment, the grooves 71 to 73 of the extension section 70 are each formed in a rib-like waveform, but the present disclosure is not limited to this. For example, the extension section 70 may be formed in an integrated bellows shape. The bellows shape is preferably formed so as to protrude in the opposite direction from the energy storage module 120 in the up-down direction H with respect to the main surface 13a of the bottom plate 13. <Variation 1> In the above embodiment, an example has been shown in which the power storage module 120 is disposed on the bottom plate 13, but the present disclosure is not limited to this. The power storage module 120 may also be disposed on a reinforcing member 80, which will be described later.

[0053] Fig. 6 is a plan view of the power storage device according to Modification 1 of the present embodiment. Note that the upper cover 11 and the power storage assembly 100 are omitted in Fig. 6. Unless otherwise specified, the power storage device 3a has the same configuration as the power storage device 3 according to the embodiment of the present disclosure.

[0054] Compared to the power storage device 3, the power storage device 3a further includes a reinforcing member 80. The reinforcing member 80 is disposed in each of the accommodation sections 61 to 69. The reinforcing member 80 has a first reinforcing portion 81 and a second reinforcing portion 82. The first reinforcing portion 81 and the second reinforcing portion 82 are formed to extend in the width direction W and are disposed at an interval in the front-rear direction D.

[0055] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

[0056] The first minor wall 51 has a first leg portion 50a, a second leg portion 50b, a plate portion 50c, a first connecting portion 50d, and a second connecting portion 50e. The first leg portion 50a, the second leg portion 50b, and the plate portion 50c are formed to extend in the width direction W. The first leg portion 50a and the second leg portion 50b are arranged at an interval in the width direction W. The plate portion 50c is disposed between the first leg portion 50a and the second leg portion 50b in the width direction W. The plate portion 50c is disposed above the first leg portion 50a and the second leg portion 50b in the up-down direction H. The first connecting portion 50d is formed to extend in the up-down direction H and connects an end of the first leg portion 50a to one end of the plate portion 50c arranged in the width direction W. The second connection portion 50e is formed to extend in the up-down direction H, and connects the end of the second leg portion 50b to the other end arranged in the width direction W of the plate portion 50c.

[0057] The second minor wall 52, the third minor wall 53, the fourth minor wall 54, the fifth minor wall 55, and the sixth minor wall 56 have substantially the same configuration as the first minor wall 51. The first major wall 41, the second major wall 42, the third main wall 43, and the fourth main wall 44 have substantially the same configuration as the first minor wall 51.

[0058] The second reinforcing portion 82 is formed by a first standing wall 80a, a second standing wall 80b, and a plate-shaped member 80c.

[0059] The first upright wall 80a and the second upright wall 80b are formed to extend in the up-down direction H. The first upright wall 80a and the second upright wall 80b are arranged at an interval in the width direction W. The plate-like member 80c is formed to extend in the width direction W. The plate-like member 80c is formed to connect the upper end of the first upright wall 80a and the upper end of the second upright wall 80b. The first reinforcing portion 81 has substantially the same configuration as the second reinforcing portion 82.

[0060] The second reinforcing portion 82 arranged in the accommodation portion 61 is formed to connect the first side wall 21 and the first minor wall 51. The second reinforcing portion 82 arranged in the accommodation portion 61 is joined to the first side wall 21 and the first minor wall 51. More specifically, the first upright wall 80a of the second reinforcing portion 82 is joined to the first side wall 21. The second upright wall 80b of the second reinforcing portion 82 is joined to the first foot portion 50a of the first minor wall 51. The joining may be performed by spot welding, for example. The same applies to the first reinforcing portion 81 arranged in the accommodation portion 61. In the embodiment of the first modification, the first side wall 21 and the first minor wall 51 of the accommodation portion 61 are examples of the "first defining wall" and the "second defining wall," respectively, of the present disclosure.

[0061] The first reinforcing portion 81 and the second reinforcing portion 82 arranged in the housing portions 63, 64, 66, 67, and 69 have substantially the same configuration as the first reinforcing portion 81 and the second reinforcing portion 82 arranged in the housing portion 61.

[0062] The second reinforcing portion 82 disposed in the accommodation portion 62 is formed to connect the first minor wall 51 and the second minor wall 52. The second reinforcing portion 82 disposed in the accommodation portion 62 is joined to the first minor wall 51 and the second minor wall 52. More specifically, the first upright wall 80a of the second reinforcing portion 82 is joined to the second foot portion 50b of the first minor wall 51. The second upright wall 80b of the second reinforcing portion 82 is joined to the first foot portion 50a of the second minor wall 52. The joining may be performed by spot welding, for example. The same applies to the first reinforcing portion 81 disposed in the accommodation portion 62. In the embodiment of the first modification, the first minor wall 51 and the second minor wall 52 of the accommodation portion 62 are examples of the "first defining wall" and the "second defining wall," respectively, of the present disclosure.

[0063] Furthermore, the configurations of the first reinforcing portion 81 and the second reinforcing portion 82 arranged in the housing portions 65 and 68 are substantially the same as the configurations of the first reinforcing portion 81 and the second reinforcing portion 82 arranged in the housing portion 62.

[0064] In the above embodiment, the power storage module 120 is disposed on the reinforcing member 80. By adopting such a configuration, it is possible to prevent the power storage module 120 from being damaged by an external impact.

[0065] More specifically, because the extension portion 70 is formed on the bottom plate 13, the bottom plate 13 is more easily deformed by a load from the vertical direction H than if the extension portion 70 were not formed. As a result, if the reinforcing member 80 were not arranged, an external impact on the bottom plate 13 would be transmitted to the energy storage module 120 without being reduced by the bottom plate 13. On the other hand, by arranging the energy storage module 120 on the reinforcing member 80, a gap g2 (see FIG. 7 ) is formed between the bottom plate 13 and the energy storage module 120, and therefore it is possible to prevent an external impact on the bottom plate 13 from being transmitted to the energy storage module 120.

[0066] In the above embodiment, the reinforcing member 80 is joined to the wall portion 14. By adopting such a configuration, it is possible to avoid increasing the rigidity of the bottom plate 13. As a result, it is possible to maintain the function of the bottom plate 13 being deformed by the emission of smoke from the smoke vent valve 126.

[0067] In the above embodiment, the reinforcing member 80 is formed to extend in the width direction W, but the present disclosure is not limited to this. For example, the reinforcing member 80 may be formed to extend in the front-rear direction D. In this case, the first reinforcing portion 81 and the second reinforcing portion 82 of the reinforcing member 80 are arranged with an interval in the width direction W. <Variation 2> In the above embodiment, an example has been described in which the bottom plate 13 is deformed and a gap g1 is formed between the bottom plate 13 and the energy storage module 120, but the present disclosure is not limited to this. For example, a gap may be formed between the bottom plate 13 and the energy storage module 120 from the beginning.

[0068] Fig. 8 is a plan view of the power storage device according to Modification 2 of the present embodiment. Note that the upper cover 11 and the power storage assembly 100 are omitted in Fig. 8. Unless otherwise specified, the power storage device 3b has the same configuration as the power storage device 3 according to the embodiment of the present disclosure.

[0069] The energy storage device 3b has a bottom plate 200. The bottom plate 200 is fixed to the wall 14. The bottom plate 200 has a main surface 200a and a facing region 200b. The main surface 200a is a surface of the bottom plate 200 that faces the energy storage assembly 100. The facing region 200b is a region of the main surface 200a that faces the bottom surface 123 of the energy storage module 120 housed in the housing sections 61 to 69 shown in FIG. 9. A recess 210 is formed in each of the facing regions 200b of the bottom plate 200. When the recess 210 is viewed from a position spaced apart from the bottom plate 200 in the up-down direction H, the recess 210 is formed in a circular shape and extends to the edge of the wall 14.

[0070] FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG.

[0071] The recess 210 is formed so as to protrude away from the power storage module 120. A gap g3 is formed between the bottom plate 200 and the power storage module 120.

[0072] In the above embodiment, a gap g3 is formed. By adopting such a configuration, debris and electrolyte contained in the flue gas discharged from the smoke vent valve 116 of the power storage module 110 and the smoke vent valve 126 of the power storage module 120 can be deposited in the gap g3. This makes it possible to prevent adjacent power storage modules from being short-circuited by the debris and electrolyte. Furthermore, by adopting such a configuration, it is possible to prevent an impact applied to the bottom plate 13 from being transmitted to the power storage module 120.

[0073] In the above embodiment, the recess 210 is preferably formed in a shape such that the center O is the farthest from the power storage module 120 .

[0074] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0075] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 3 power storage device, 3a power storage device, 3b power storage device, 10 storage case, 11 upper cover, 12 lower case, 13 bottom plate, 13a main surface, 13b opposing area, 14 wall portion, 20 peripheral wall portion, 21 first side wall, 22 second side wall, 23 first end wall, 24 second end wall, 30 partition wall, 40 main wall, 41 first main wall, 42 second main wall, 43 third main wall, 44 fourth main wall, 50 dependent wall, 50a first foot portion, 50b second foot portion, 50c plate portion, 50d first connecting portion, 50e second connecting portion, 51 first dependent wall, 52 second dependent wall, 53 third dependent wall, 54 fourth dependent wall, 55 fifth dependent wall, 56 sixth dependent wall, 60 Storage space, 61-69: storage section, 70: extension section, 71-73: groove section, 80: reinforcing member, 80a: first upright wall, 80b: second upright wall, 80c: plate-shaped member, 81: first reinforcing member, 82: second reinforcing member, 100: power storage assembly, 101-109: power storage unit, 110, 120: power storage module, 111: module case, 112: first end surface, 113: upper surface, 114: positive terminal, 115: negative terminal, 116: smoke exhaust valve, 117: power storage cell, 118: power storage cell, 121: module case, 122: first end surface, 123: lower surface, 124: positive terminal, 125: negative terminal, 126: smoke exhaust valve, 200: bottom plate, 200a: main surface, 200b: facing region, 210 Recess, g gap, O center, P1~P6 imaginary lines, R accommodation space.

Claims

1. A power storage device mounted on a vehicle, The power storage device includes a housing case and at least one power storage module, The housing case includes an upper cover and a lower case, The lower case has a bottom plate and a wall portion formed to rise upward from the bottom plate, the wall portion and the bottom plate define housing portions that individually house the power storage modules; the energy storage module is accommodated in the accommodation portion and has a bottom surface facing the bottom plate, A smoke exhaust valve is formed on the bottom surface, the bottom plate has a main surface facing the power storage module, the main surface has an opposing region opposing the bottom surface, The bottom plate is deformed so as to move away from the power storage module when smoke is ejected from the smoke exhaust valve.

2. the bottom plate has an extension formed in the facing region; 2. The energy storage device according to claim 1, wherein the extension portion is formed in line symmetry with respect to a line passing through the center of the opposing region in the width direction of the vehicle, and in line symmetry with respect to a line passing through the center of the opposing region in the length direction of the vehicle, and has at least one rib wave shape formed in a ring shape.

3. A power storage device mounted on a vehicle, The power storage device includes a housing case and at least one power storage module, The housing case includes an upper cover and a lower case, The lower case has a bottom plate and a wall portion formed to rise upward from the bottom plate, the wall portion and the bottom plate define housing portions that individually house the power storage modules; the energy storage module is accommodated in the accommodation portion and has a bottom surface facing the bottom plate, A smoke exhaust valve is formed on the bottom surface, the bottom plate has a main surface facing the power storage module, the main surface has an opposing region opposing the bottom surface, The electric storage device further comprises a recess formed in the opposing region of the bottom plate so as to be spaced apart from the electric storage module.

4. The wall portion includes a first defining wall and a second defining wall disposed at a distance from the first defining wall, The housing case further includes a reinforcing member, the reinforcing member is formed to connect the first defining wall and the second defining wall, The power storage device according to claim 1 , wherein the power storage module is disposed on the reinforcing member.

5. The power storage device according to claim 4 , wherein the reinforcing member is joined to the first and second defining walls, and the bottom plate is fixed to the walls.

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