Electricity storage device

Abstract

The electrical storage device comprises: an electrical storage module comprising a plurality of electrical storage cells; a case that accommodates the power storage module; an adhesive layer that adheres the plurality of storage cells to the case; and the smoke exhaust valve is arranged on the shell. A smoke discharge passage extending toward the smoke discharge valve is formed in the adhesive layer.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power storage device. BACKGROUND

[0002] A battery pack having a plurality of battery cells and a battery pack case is disclosed in Japanese Patent Application Publication No. 2021-111520. The plurality of battery cells are adhered to a floor surface of the battery pack case.

[0003] In the battery pack described in Japanese Patent Application Publication No. 2021-111520, it is considered that the adhering material that adheres the battery cells to the battery pack case hinders the smoke generated in the battery cells (power storage cells) from being discharged to the outside of the case. SUMMARY

[0004] The present disclosure was completed in order to solve the above problem, and has an object to provide a power storage device that can easily discharge smoke generated in power storage cells to the outside of a case.

[0005] The power storage device according to one aspect of the present disclosure includes: a power storage module including a plurality of power storage cells; a case accommodating the power storage module; an adhering member adhering the plurality of power storage cells to the case; and a smoke discharge valve provided to the case. The adhering member is formed with a smoke discharge passage extending toward the smoke discharge valve.

[0006] In the power storage device according to one aspect of the present disclosure, as described above, the adhering member is formed with the smoke discharge passage extending toward the smoke discharge valve. Thereby, the smoke generated in the power storage cells can be easily moved to the smoke discharge valve through the smoke discharge passage. As a result, the smoke generated in the power storage cells can be easily discharged to the outside of the case.

[0007] The case can include: a covering portion provided to cover the plurality of power storage cells from one side in a first direction and adhered to the plurality of power storage cells by the adhering member; a peripheral wall portion provided to surround the plurality of power storage cells as viewed from the one side and provided with the smoke discharge valve; and a partition wall portion dividing a plurality of spaces in the case accommodating the plurality of power storage cells as viewed from the one side. The smoke discharge passage can extend from the partition wall portion toward the smoke discharge valve of the peripheral wall portion as viewed from the one side. Here, in the partition wall portion provided between the power storage cells, the smoke from the power storage cells is easily stored. Therefore, the smoke discharge passage extending from the partition wall portion toward the smoke discharge valve is particularly effective for discharging the smoke to the outside of the case.

[0008] The plurality of power storage cells can also be formed longer in the second direction when viewed from the one side. An exhaust portion can be formed at one end of each of the plurality of power storage cells in the second direction. The plurality of power storage cells can also be arranged in a third direction intersecting the second direction when viewed from the one side. The partition wall portion can include a first partition wall extending in the third direction. The plurality of power storage cells can be configured such that the plurality of exhaust portions are arranged in the third direction along the first partition wall. With such a configuration, smoke discharged from the plurality of exhaust portions arranged along the first partition wall can easily flow into the smoke discharge passage extending from the first partition wall toward the smoke discharge valve.

[0009] The peripheral wall portion can include a first side wall extending in the third direction. The smoke discharge valve can be provided to the first side wall. The smoke discharge passage can be formed to extend in the second direction between the first partition wall and the first side wall. With such a configuration, the length of the smoke discharge passage can be reduced compared to a case where the smoke discharge passage extends in a bent manner between the first partition wall and the first side wall. As a result, smoke can be rapidly discharged through the smoke discharge passage.

[0010] The partition wall portion can include a second partition wall extending in the second direction. The adhesion member can be formed with a cross smoke discharge passage extending from the second partition wall toward the peripheral wall portion and intersecting the smoke discharge passage. With such a configuration, smoke generated in the power storage cell can be discharged outside the case through the cross smoke discharge passage. As a result, smoke inside the case can be more efficiently discharged outside the case.

[0011] According to the present disclosure, smoke generated in the power storage cell can be easily discharged outside the case.

[0012] Features, advantages, and technical and industrial significance of exemplary embodiments of the present application will be described below with reference to the accompanying drawings, wherein the same reference numerals in different drawings denote the same element. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a view showing the structure of a vehicle on which a power storage device according to one embodiment is mounted.

[0014] Figure 2 is an exploded perspective view showing the structure of a power storage device and a vehicle frame according to one embodiment.

[0015] Figure 3 is an exploded perspective view showing the detailed structure of a power storage device according to one embodiment.

[0016] Figure 4 is a perspective view showing the structure of a power storage cell according to one embodiment.

[0017] Figure 5is a plan view that schematically shows a structure of the power storage device according to one embodiment.

[0018] Figure 6 is a first cross-sectional view that schematically shows a structure of the power storage device according to one embodiment.

[0019] Figure 7 is an enlarged plan view that schematically shows a structure of the power storage device according to one embodiment.

[0020] Figure 8 is a second cross-sectional view that schematically shows a structure of the power storage device according to one embodiment.

[0021] Figure 9 is a plan view that schematically shows a structure of the power storage device according to a modification of one embodiment. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments and modifications according to the present disclosure will be described with reference to the accompanying drawings. In the following description, the same parts and constituent elements are denoted by the same reference numerals. The names and functions of these parts are also the same. Therefore, detailed description about the same parts and constituent elements will not be repeated. Furthermore, the embodiments and modifications described below can also be appropriately and selectively combined.

[0023] REFERENCE Figures 1-8 A power storage device according to the present embodiment will be described. Figure 1 is a side view that schematically shows a vehicle 900 equipped with the power storage device 1 according to the present embodiment. Furthermore, the X direction, the Y direction, and the Z direction of the present specification are mutually orthogonal directions. For example, the X direction and the Y direction are the front-rear direction and the width direction of the vehicle 900 in a case where the vehicle 900 is equipped with the power storage device 1. In addition, the Z direction is the up-down (plumb) direction of the vehicle 900. Furthermore, the X direction and the Y direction are examples of the "second direction" and the "third direction" of the present disclosure. In addition, the Z direction is the "first direction" of the present disclosure. In addition, the Z1 side is an example of "one side of the first direction" of the present disclosure.

[0024] REFERENCE Figure 1 The power storage device 1 is disposed below a floor panel 913( Figure 2 ) of the vehicle 900. As an example of the vehicle 900, a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, and an electric vehicle can be given. The vehicle 900 is equipped with the power storage device 1 and a vehicle frame 910.

[0025] Figure 2 is an exploded perspective view that schematically shows the power storage device 1 and the vehicle frame 910. Referring to Figure 2 The vehicle frame 910 includes a left frame 911 and a right frame 912.

[0026] The left frame 911 and the right frame 912 are disposed at the bottom of the vehicle frame 910. The left frame 911 and the right frame 912 are disposed apart from each other in the width direction (Y direction) of the vehicle 900. In addition, the left frame 911 and the right frame 912 are each disposed so as to extend in the front-rear direction (X direction) of the vehicle 900.

[0027] The floor panel 913 is provided between the left frame 911 and the right frame 912. The power storage device 1 is disposed below the floor panel 913 and is fixed to the left frame 911 and the right frame 912.

[0028] Figure 3 is a schematic perspective view of the power storage device 1. Referring to Figure 3 , the power storage device 1 includes a power storage module 100 including a plurality of power storage cells 10, a case 200 that houses the power storage module 100, an adhesive layer 300 Figure 5 , and a smoke evacuation valve 250. In Figure 3 , the illustration of the adhesive layer 300 is omitted for simplicity. In addition, the adhesive layer 300 is an example of the “adhesive member” of the present disclosure.

[0029] The power storage cell 10 is a secondary battery, and is typically a lithium-ion secondary battery. The lithium-ion secondary battery is a battery that uses lithium as a charge carrier, and can include an all-solid battery that uses a solid electrolyte in addition to a lithium-ion secondary battery in which the electrolyte is a liquid. In addition, the power storage cell 10 is not limited to a lithium-ion secondary battery, and can be constituted by a nickel-hydrogen secondary battery or another secondary battery.

[0030] The plurality of power storage cells 10 are each disposed so as to extend in the front-rear direction (X direction) of the vehicle 900 (see Figure 1 ). In addition, the plurality of power storage cells 10 are arranged in the width direction (Y direction) of the vehicle 900.

[0031] The case 200 includes an upper cover 210 and a lower case 220. In Figure 3 , the power storage device 1 is shown in a state in which the upper cover 210 has been removed. In addition, the upper cover 210 is an example of the “covering portion” of the present disclosure.

[0032] The upper cover 210 is disposed so as to cover the plurality of power storage cells 10 (power storage module 100) from the Z1 side.

[0033] The lower case 220 includes a bottom plate 221, a peripheral wall portion 222, and a plurality of partition walls 223, 224, 225, 226, 227. The plurality of partition walls 223, 224, 225, 226, 227 divide a plurality of spaces within the case 200. The partition walls 223, 224, 225, 226, 227 are provided to the bottom plate 221.

[0034] The bottom plate 221 is formed in a flat plate shape. The bottom plate 221 is provided to support the plurality of power storage cells 10 (power storage modules 100) from the Z2 side.

[0035] The peripheral wall portion 222 is formed to extend from the outer peripheral portion of the bottom plate 221 toward the upper side of the vehicle 900. The peripheral wall portion 222 is formed in a ring shape. The peripheral wall portion 222 is provided to surround the plurality of power storage cells 10 (power storage modules 100) as viewed from the Z1 side. Further, "as viewed from the Z1 side" means "as viewed from a point P at which the power storage modules 100 and the peripheral wall portion 222 are separated on the Z1 side".

[0036] The peripheral wall portion 222 includes a side wall 222a, a side wall 222b, a side wall 222c, and a side wall 222d. The side wall 222a is provided to extend in the X direction on the Y1 side of the power storage module 100. The side wall 222b is provided to extend in the X direction on the Y2 side of the power storage module 100. The side wall 222c is provided to extend in the Y direction on the X1 side of the power storage module 100. The side wall 222d is provided to extend in the Y direction on the X2 side of the power storage module 100. Further, the side wall 222c and the side wall 222d are each an example of the "first side wall" of the present disclosure.

[0037] The partition walls 223, 226, 227 divide a plurality of spaces in the housing 200 that accommodate the plurality of power storage cells 10 as viewed from the Z1 side. In other words, the partition walls 223, 226, 227 are provided to separate the spaces (S1 to S4 described later) that accommodate the plurality of power storage cells 10 from each other as viewed from the Z1 side.

[0038] The partition walls 223, 224, 225, 226 are formed to extend in the front-rear direction (X direction) of the vehicle 900. The partition wall 227 is formed to extend in the width direction (Y direction) of the vehicle 900. Further, the partition wall 227 is an example of the "first partition wall" and the "partition wall portion" of the present disclosure. In addition, the partition wall 223 and the partition wall 226 are each an example of the "second partition wall" and the "partition wall portion" of the present disclosure.

[0039] The partition wall 227 is disposed in the center of the lower housing 220 in the X direction. The partition wall 223 and the partition wall 226 are each disposed in the center of the lower housing 220 in the Y direction. The partition wall 223 is disposed at a position closer to the X1 side than the partition wall 227. The partition wall 226 is disposed at a position closer to the X2 side than the partition wall 227. The partition wall 224 is provided to extend in the X direction on the Y1 side of the plurality of power storage cells 10. The partition wall 225 is provided to extend in the X direction on the Y2 side of the plurality of power storage cells 10.

[0040] The lower housing 220 is formed with a hole portion 220a, a hole portion 220b, a hole portion 220c, a hole portion 220d, a hole portion 220e, and a hole portion 220f.

[0041] The hole portion 220a, the hole portion 220b, and the hole portion 220c are each formed so as to extend in the X direction between the side wall 222a and the partition wall 224. The hole portion 220a is provided on the XI side of the hole portion 220b. The hole portion 220c is provided on the X2 side of the hole portion 220b.

[0042] The hole portion 220d, the hole portion 220e, and the hole portion 220f are each formed so as to extend in the X direction between the side wall 222b and the partition wall 225. The hole portion 220d is provided on the XI side of the hole portion 220e. The hole portion 220f is provided on the X2 side of the hole portion 220e. Further, the hole portions 220a to 220f can not be formed in the lower case.

[0043] The lower case 220 includes a partition wall 220g, a partition wall 220h, a partition wall 220i, and a partition wall 220j.

[0044] The partition wall 220g extends in the Y direction between the hole portion 220a and the hole portion 220b so as to connect the partition wall 224 and the side wall 222a. The partition wall 220h extends in the Y direction between the hole portion 220b and the hole portion 220c so as to connect the partition wall 224 and the side wall 222a.

[0045] The partition wall 220i extends in the Y direction between the hole portion 220d and the hole portion 220e so as to connect the partition wall 225 and the side wall 222b. The partition wall 220j extends in the Y direction between the hole portion 220e and the hole portion 220f so as to connect the partition wall 225 and the side wall 222b.

[0046] Further, the partition wall 223, the partition wall 224, the partition wall 225, the partition wall 226, the partition wall 227, the partition wall 220g, the partition wall 220h, the partition wall 220i, and the partition wall 220j are each not bonded to the upper cover 210. In addition, the upper cover 210 is formed so as to be more easily deformed than the lower case 220 or the like.

[0047] Thus, when the internal pressure becomes high due to smoke in the vicinity of each of the above-described partition walls, the upper cover 210 expands to the Zl side at that position. As a result, a gap is generated between each of the above-described partition walls and the upper cover 210. In this case, the smoke passes through the above-described gap and circulates within the lower case 220.

[0048] A plurality of power storage cells 10 are arranged in the spaces S1 to S4 within the lower case 220. The space S1 is a space surrounded by the partition wall 223, the partition wall 224, the partition wall 227, and the side wall 222c. The space S2 is a space surrounded by the partition wall 226, the partition wall 224, the partition wall 227, and the side wall 222d. Further, between the side wall 222c and the power storage module 100, a region E in which an apparatus or the like not shown is arranged is provided.

[0049] The space S3 is a space surrounded by the partition wall 225, the partition wall 223, the partition wall 227, and the side wall 222c. The space S4 is a space surrounded by the partition wall 225, the partition wall 226, the partition wall 227, and the side wall 222d.

[0050] The lower case 220 further includes a plurality of support portions 228 and a plurality of support portions 229. The support portions 228 and the support portions 229 are fixed to the vehicle frame 910 ( Figure 2 ), respectively. For example, the support portions 228 and the support portions 229 are formed with holes into which bolts are inserted, respectively. By inserting the bolts into the holes, the plurality of support portions 228 are fixed to the left frame 911 ( Figure 2 ), respectively, and the plurality of support portions 229 are fixed to the right frame 912 ( Figure 2 ), respectively.

[0051] The smoke discharge valves 250 are provided to the lower case 220. Specifically, the smoke discharge valves 250 are provided to the side wall 222c and the side wall 222d, respectively. Two smoke discharge valves 250 are provided to each of the side wall 222c and the side wall 222d. In each of the side wall 222c and the side wall 222d, the smoke discharge valves 250 are provided to positions on the Y1 side and positions on the Y2 side with respect to the partition wall 223 (the partition wall 226), respectively.

[0052] Figure 4 An example of the power storage cell 10 is shown. Referring to Figure 4 , the power storage cell 10 includes an upper surface 11, a lower surface 12, a short side surface 13, a short side surface 14, a long side surface 15, and a long side surface 16. Further, the short side surface 13 is an example of “one end” of the present disclosure.

[0053] The upper surface 11 and the lower surface 12 are surfaces in the Z direction in the power storage cell 10, respectively. Specifically, the upper surface 11 is an end surface on the Z1 side in the power storage cell 10. The lower surface 12 is an end surface on the Z2 side in the power storage cell 10, and is a surface provided on the side opposite to the upper surface 11 in the Z direction.

[0054] The short side surface 13 and the short side surface 14 are surfaces in the X direction in the power storage cell 10, respectively. Specifically, the short side surface 13 and the short side surface 14 are an end surface on the X direction and another end surface on the X direction in the power storage cell 10, respectively.

[0055] The long side surface 15 and the long side surface 16 are surfaces in the Y direction in the power storage cell 10, respectively. Specifically, the long side surface 15 and the long side surface 16 are an end surface on the Y direction and another end surface on the Y direction in the power storage cell 10, respectively.

[0056] The power storage cell 10 is formed long in the X direction. Specifically, the width W1 of the power storage cell 10 in the X direction is larger than the width W2 of the power storage cell 10 in the Y direction. Also, the width W1 is larger than the height H of the power storage cell 10 in the Z direction. Further, the height H is larger than the width W2.

[0057] The power storage cell 10 also includes a positive electrode terminal 17 and a negative electrode terminal 18. The positive electrode terminal 17 is provided to the short side surface 14. The negative electrode terminal 18 is provided to the short side surface 13.

[0058] The power storage cell 10 also includes a cell smoke exhaust valve 19 that exhausts gas in the power storage cell 10. The cell smoke exhaust valve 19 is configured to exhaust gas (smoke) in the inside of the power storage cell 10 to the outside of the power storage cell 10 in the case where the internal pressure of the power storage cell 10 rises. The cell smoke exhaust valve 19 is provided to a side surface of the power storage cell 10. In the example shown in the figure, the cell smoke exhaust valve 19 is provided to the short side surface 13 in which the negative electrode terminal 18 is provided. Further, the cell smoke exhaust valve 19 can also be provided to the short side surface 14, the long side surface 15, or the long side surface 16. Also, the cell smoke exhaust valve 19 is an example of the "exhaust portion" of the present disclosure. Figure 4

[0059] Figure 5 is a plan view of the power storage device 1 in a state in which the upper cover 210 is removed. The adhesive layer 300 is disposed to the power storage module 100. Specifically, the adhesive layer 300 is disposed (applied) to the respective upper surfaces 11 of the plurality of power storage cells 10. Thereby, the adhesive layer 300 adheres the plurality of power storage cells 10 to the upper cover 210.

[0060] Specifically, the adhesive layer 300 is provided to each of the spaces S1 to S4. The adhesive layer 300 is disposed (stacked) to the plurality of power storage cells 10 of each of the spaces S1 to S4. Specifically, the adhesive layer 300 is formed by applying a gel-like adhesive material to the respective upper surfaces 11 of the plurality of power storage cells 10. Further, the upper surfaces of each of the partition walls (223, 224, 225, 225, 227) are not covered by the adhesive layer 300. Therefore, the respective adhesive layers 300 of the spaces S1 to S4 are separated from each other. Further, the adhesive layer 300 is formed of, for example, a resin-made adhesive material.

[0061] Here, in the conventional power storage device, it is considered that the adhesive material that adheres the power storage cell to the case hinders the exhaust of smoke generated in the power storage cell to the outside of the case.

[0062] Therefore, in the present embodiment, the smoke exhaust passage 310 that extends toward the smoke exhaust valve 250 is formed in the adhesive layer 300. The smoke exhaust passage 310 is formed by providing a cavity (a space that is not filled with the adhesive material) under the upper cover 210.

[0063] ​The smoke exhaust passages 310 are provided in the spaces S1 to S4, respectively. In each of the spaces S1 to S4, the smoke exhaust passage 310 is formed so as to extend in the Y direction. Each of the smoke exhaust passages 310 is formed in a straight line. Specifically, each of the smoke exhaust passages 310 extends in the X direction as a straight line without being bent.

[0064] The smoke exhaust passage 310 of the space S1 extends from the partition wall 227 toward the smoke exhaust valve 250 on the Y1 side in the side wall 222c. The smoke exhaust passage 310 of the space S2 extends from the partition wall 227 toward the smoke exhaust valve 250 on the Y1 side in the side wall 222d.

[0065] The smoke exhaust passage 310 of the space S3 extends from the partition wall 227 toward the smoke exhaust valve 250 on the Y2 side in the side wall 222c. The smoke exhaust passage 310 of the space S4 extends from the partition wall 227 toward the smoke exhaust valve 250 on the Y2 side in the side wall 222d.

[0066] Each of the smoke exhaust passages 310 is disposed in the Y direction at a position overlapping with a position (range) in which the smoke exhaust valve 250 is provided. In addition, the smoke exhaust passage 310 is provided in the Y direction at a center of each of the spaces S1 to S4.

[0067] Further, the above-described "the smoke exhaust passage 310 extends from the partition wall 227" also includes a case in which the smoke exhaust passage 310 extends from a vicinity of the partition wall 227, and a slight gap is formed between the smoke exhaust passage 310 and the partition wall 227. Hereinafter, in a case where the same expression is described, the same definition is applied.

[0068] In each of the spaces S1 to S4, the smoke exhaust passage 310 extends from an X1 side end portion of the adhesive layer 300 to an X2 side end portion.

[0069] In each of the spaces S1 to S4, the adhesive layer 300 is formed with a smoke exhaust passage 320 intersecting the smoke exhaust passage 310. The smoke exhaust passage 320 is formed by providing a cavity (a space not filled with an adhesive material) under the upper cover 210. Each of the smoke exhaust passages 320 is formed so as to extend in the Y direction. In each of the spaces S1 to S4, the smoke exhaust passage 310 is orthogonal to the smoke exhaust passage 320. Further, the smoke exhaust passage 320 is an example of the "intersecting smoke exhaust passage" of the present disclosure.

[0070] The smoke exhaust passage 310 and the smoke exhaust passage 320 are connected at an intersection of the smoke exhaust passage 310 and the smoke exhaust passage 320. That is, there is a case in which smoke moves between the smoke exhaust passage 310 and the smoke exhaust passage 320.

[0071] The smoke discharge passage 320 in the space S1 extends from the partition wall 223 toward the side wall 222a. Specifically, the smoke discharge passage 320 in the space S1 extends from the partition wall 223 to the partition wall 224. The smoke discharge passage 320 in the space S2 extends from the partition wall 226 toward the side wall 222a. Specifically, the smoke discharge passage 320 in the space S2 extends from the partition wall 226 to the partition wall 224.

[0072] The smoke discharge passage 320 in the space S3 extends from the partition wall 223 toward the side wall 222b. Specifically, the smoke discharge passage 320 in the space S3 extends from the partition wall 223 to the partition wall 225. The smoke discharge passage 320 in the space S4 extends from the partition wall 226 toward the side wall 222b. Specifically, the smoke discharge passage 320 in the space S4 extends from the partition wall 226 to the partition wall 225.

[0073] Thus, the smoke accumulated in the vicinity of each of the partition wall 223 and the partition wall 226 is moved to the side wall 222a or the side wall 222b side through the smoke discharge passage 320. In addition, the smoke moved to the smoke discharge passage 310 from the smoke discharge passage 320 can be discharged to the outside of the case 200 from the smoke discharge valve 250.

[0074] In addition, the smoke discharge passage 320 is provided in the respective center of the spaces S1 to S4 in the X direction. In each of the spaces S1 to S4, the smoke discharge passage 320 extends from the end portion on the Y1 side of the adhesive layer 300 to the end portion on the Y2 side. Thus, in each of the spaces S1 to S4, the adhesive layer 300 is divided into four portions by the smoke discharge passage 310 and the smoke discharge passage 320.

[0075] Figure 6 is a cross-sectional view schematically showing the floor panel 913 and the power storage device 1. In Figure 6 , the adhesive layer 300 and the plurality of power storage cells 10 in the space S1 viewed from the X2 side are shown. Further, in Figure 6 , the structure corresponding to the space S1 is schematically illustrated, but the structures corresponding to the spaces S2 to S4 are the same as this.

[0076] Referring to Figure 6 , in the power storage device 1, the power storage cell 10 configured with the short side surface 13 facing the X2 side and the power storage cell 10 configured with the short side surface 14 facing the X2 side are alternately arranged along the Y direction.

[0077] Thus, the cell smoke discharge valve 19 formed in the short side surface 13 is arranged in the Y direction. In addition, the power storage cells 10 adjacent to each other in the Y direction are disposed with the positive electrode terminal 17 and the negative electrode terminal 18 adjacent to each other.

[0078] As Figure 6As shown, the upper surface 11 of the electricity storage battery cell 10 is exposed at a position corresponding to the smoke exhaust passage 310. In other words, no adhesive layer is provided on the Z2 side of the smoke exhaust passage 310. Further, an adhesive layer having a smaller thickness (thickness in the Z direction) can be provided on the Z2 side of the smoke exhaust passage 310.

[0079] The smoke exhaust passage 310 has a width W11 in the Y direction. The width W11 is, for example, smaller than the width W2 of the electricity storage battery cell 10 in the Y direction. Figure 4 ) The width W11 of the smoke exhaust passage 310 is constant at each position in the X direction. Further, the width W11 can be equal to or greater than the width W2.

[0080] The smoke exhaust passage 310 has a rectangular shape when viewed in the X direction. Further, the shape of the smoke exhaust passage 310 when viewed in the X direction is not limited to the example described above. In addition, "viewing the smoke exhaust passage 310 in the X direction" means viewing the smoke exhaust passage 310 from a position opposite the smoke exhaust passage 310 in the X direction.

[0081] The electricity storage device 1 further includes a cooler 400 that cools the electricity storage battery cells 10. The cooler 400 has a cooling surface 410 on which a plurality of electricity storage battery cells 10 are arranged. The cooling surface 410 is an end surface on the Z1 side in the cooler 400. The cooler 400 (cooling surface 410) is arranged along the lower surfaces 12 of the electricity storage battery cells 10. Further, in the example shown in Figure 6 , an example in which no adhesive material (adhesive layer) is provided between the cooling surface 410 and the lower surfaces 12 of the electricity storage battery cells 10 is shown, but an adhesive material (adhesive layer) can be arranged at this position.

[0082] The electricity storage device 1 further includes an insulating plate 500. The insulating plate 500 is arranged along the bottom plate 221 between the cooler 400 and the bottom plate 221.

[0083] The electricity storage device 1 includes a plurality of inter-cell bus bars 600. The inter-cell bus bar 600 connects the positive electrode terminal 17 provided in one of two electricity storage battery cells 10 adjacent in the Y direction and the negative electrode terminal 18 provided in the other of the two electricity storage battery cells 10.

[0084] Figure 7 is a plan view of the plurality of electricity storage battery cells 10 in the space S1 viewed from the Z1 side. Further, in Figure 7 , the illustration of the adhesive layer 300 is omitted for simplicity. In addition, in Figure 7 , a structure corresponding to the space S1 is typically illustrated, but the structures corresponding to the spaces S2 to S4 are the same as this.

[0085] As shown in Figure 7As shown, the plurality of power storage cells 10 are configured so that the cell smoke exhaust valves 19 are arranged in the Y direction along the partition wall 227. Specifically, the cell smoke exhaust valves 19 of the plurality of power storage cells 10 whose short side faces 13 face the partition wall 227 side are arranged in the Y direction. Thereby, smoke is exhausted toward the partition wall 227 from the plurality of cell smoke exhaust valves 19 arranged along the partition wall 227. At least a part of the smoke exhausted toward the partition wall 227 is exhausted from the smoke exhaust valve 250( Figure 5 ) provided to the partition wall 227.

[0086] In addition, the plurality of cell smoke exhaust valves 19 are arranged in the Y direction along the side wall 222c on the side opposite to the partition wall 227. Specifically, the cell smoke exhaust valves 19 of the plurality of power storage cells 10 whose short side faces 13 face the side wall 222c side are arranged in the Y direction. Thereby, smoke is exhausted toward the side wall 222c from the plurality of cell smoke exhaust valves 19 arranged along the side wall 222c. At least a part of the smoke exhausted toward the side wall 222c is exhausted from the smoke exhaust valve 250( Figure 5 ) provided to the side wall 222c.

[0087] Figure 8 is a cross-sectional view schematically showing the floor panel 913 and the power storage device 1. In Figure 8 , the adhesive layer 300 and the power storage cell 10 in the space S1 viewed from the Y1 side are shown. Further, in Figure 8 , a structure corresponding to the space S1 is schematically shown, but the structures corresponding to the spaces S2 to S4 are the same as this.

[0088] As shown in Figure 8 , at a position corresponding to the smoke exhaust passage 320, the upper surface 11 of the power storage cell 10 is exposed. In other words, on the Z2 side of the smoke exhaust passage 320, the adhesive layer is not provided. Further, an adhesive layer having a smaller thickness (thickness in the Z direction) can also be provided on the Z2 side of the smoke exhaust passage 320.

[0089] The smoke exhaust passage 320 has a width W12 in the Y direction. The width W12 of the smoke exhaust passage 320 at each position in the Y direction is constant. Further, the width W12 can also be equal to the width W11( Figure 6 ) of the smoke exhaust passage 310, for example.

[0090] The smoke exhaust passage 320 has a rectangular shape when viewed in the Y direction. Further, the shape of the smoke exhaust passage 310 when viewed in the Y direction is not limited to the above-described example. In addition, "the smoke exhaust passage 320 is viewed in the Y direction" means that the smoke exhaust passage 320 is viewed from a position opposite to the smoke exhaust passage 320 in the Y direction.

[0091] As above, in the above-described embodiment, the smoke discharge passage 310 extending toward the smoke discharge valve 250 is formed in the adhesive layer 300. Thereby, the smoke generated from the electricity storage battery cell 10 can be moved to the smoke discharge valve 250 through the smoke discharge passage 310. As a result, the flow of the smoke in the case 200 can be inhibited from being hindered by the adhesive layer 300. Thereby, the smoke in the case 200 can be easily discharged.

[0092] In the above-described embodiment, the example in which the smoke discharge passage 310 and the smoke discharge passage 320 are formed in the adhesive layer 300 is shown, but the present disclosure is not limited to this. A smoke discharge passage other than the smoke discharge passage 310 and the smoke discharge passage 320 can also be formed in the adhesive layer 300.

[0093] For example, in Figure 9 In the example shown, in the adhesive layer 300, the smoke discharge passage 330 and the smoke discharge passage 340 are formed in addition to the smoke discharge passage 310 and the smoke discharge passage 320. The smoke discharge passage 330 and the smoke discharge passage 340 are respectively provided in each of the spaces S1 to S4. The smoke discharge passage 330 is provided at a position on the Y1 side than the smoke discharge passage 310. The smoke discharge passage 340 is provided at a position on the Y2 side than the smoke discharge passage 310.

[0094] The smoke discharge passage 330 and the smoke discharge passage 340 respectively extend from the partition wall 227 to the smoke discharge passage 310. The smoke discharge passage 330 and the smoke discharge passage 340 respectively cross (connect) with the smoke discharge passage 310. The intersection points of each of the smoke discharge passage 330 and the smoke discharge passage 340 with the smoke discharge passage 310 are located at positions on the partition wall 227 side than the smoke discharge passage 320.

[0095] In the above-described embodiment, the example in which the smoke discharge passage 310 and the smoke discharge passage 320 are formed in the adhesive layer 300 is shown, but the present disclosure is not limited to this. In the adhesive layer 300, the smoke discharge passage 320 can not be formed and only the smoke discharge passage 310 can be formed.

[0096] In the above-described embodiment, the example in which the smoke discharge passage 310 extends from the partition wall 227 toward the smoke discharge valve 250 is shown, but the present disclosure is not limited to this. The smoke discharge passage can also extend from a position different from the partition wall 227 (for example, the partition walls 224, 225, and the like) toward the smoke discharge valve 250. In addition, the smoke discharge passage 310 can not extend to the end portion on the partition wall 227 side in the adhesive layer 300. In addition, the smoke discharge passage 310 can not extend to the end portion on the smoke discharge valve 250 side in the adhesive layer 300.

[0097] In the above-described embodiment, the example in which the smoke discharge valves 250 are respectively provided in the side wall 222c and the side wall 222d of the lower case 220 is shown, but the present disclosure is not limited to this. The smoke discharge valves 250 can also be provided in the side walls 222a and 222b of the lower case 220.

[0098] In the above embodiment, an example is shown in which the smoke exhaust passage 310 extends in the X direction, but the present disclosure is not limited to this. The smoke exhaust passage 310 can also extend in a direction that intersects the X direction and the Y direction, respectively, as viewed from the Zl side. Further, the smoke exhaust passage 320 can also extend in a direction that intersects the X direction and the Y direction, respectively, as viewed from the Zl side.

[0099] In the above embodiment, an example is shown in which one smoke exhaust passage 310 and one smoke exhaust passage 320 are respectively provided in each of the spaces S1 to S4, but the present disclosure is not limited to this. In each of the spaces S1 to S4, at least one of a plurality of smoke exhaust passages 310 and a plurality of smoke exhaust passages 320 can also be provided.

[0100] In the above embodiment, an example is shown in which the positive electrode terminal 17 and the negative electrode terminal 18 are provided on different faces, but the present disclosure is not limited to this. The positive electrode terminal 17 and the negative electrode terminal 18 can also be provided on the same face (the short side face 13 or the short side face 14), respectively.

[0101] In the above embodiment, an example is shown in which the cooler 400 is provided below the power storage battery cell 10, but the present disclosure is not limited to this. The cooler can also be provided above the power storage battery cell. In this case, the adhesive material in which the smoke exhaust passage is formed can also adhere the lower face 12 of the power storage battery cell 10 to the lower case 220.

[0102] In the above embodiment, an example is shown in which the plurality of power storage battery cells 10 are arranged in the Y direction that is orthogonal (crosses) the Z direction (the up-down direction), but the present disclosure is not limited to this. For example, the plurality of power storage battery cells 10 can also be arranged (stacked) in the Z direction.

[0103] In the above embodiment, an example is shown in which the spaces (S1 to S4) in which the plurality of power storage battery cells 10 are arranged are divided from each other, but the present disclosure is not limited to this. For example, the spaces in which the power storage battery cells 10 are arranged can also not be divided. That is, only one space in which the plurality of power storage battery cells 10 are arranged can also be formed.

[0104] In the above embodiment, an example is shown in which the power storage device 1 is mounted on the vehicle 900, but the present disclosure is not limited to this. The power storage device 1 can also be provided in an electrical apparatus other than a vehicle (for example, a stationary power storage device).

[0105] In the above embodiment, an example is shown in which the adhesive layer 300 is formed by applying a gel-like adhesive material to the power storage battery cell 10, but the present disclosure is not limited to this. For example, the adhesive layer can also be formed by arranging a sheet-like adhesive member in a manner that spans the upper faces 11 of the plurality of power storage battery cells 10.

[0106] In the above-described embodiment, an example in which the smoke exhaust passage 310 is formed in a manner that the width W11 at each position in the X direction is constant is shown, but the present disclosure is not limited thereto. For example, the width W11 of the smoke exhaust passage 310 in the Y direction can also gradually decrease from the partition wall 227 toward the smoke exhaust valve 250. Likewise, the width W12 of the smoke exhaust passage 320 in the X direction can also gradually decrease from the partition wall 223 (226) toward the peripheral wall portion 222 (222a, 222b).

[0107] In the above-described embodiment, an example in which the smoke exhaust passage 310 intersects with the smoke exhaust passage 320 (the smoke exhaust passages are connected to each other) is shown, but the present disclosure is not limited thereto. For example, the above-described two smoke exhaust passages can also not be connected to each other by staggering the Z-directional positions of the smoke exhaust passages extending in the X direction and the Z-directional positions of the smoke exhaust passages extending in the Y direction.

[0108] The entire contents of the embodiments of the present disclosure should be considered as illustrative, and the present disclosure is not limited to the above-described embodiments. The scope of the present disclosure is not limited by the above-described description, but is indicated by the claims, and is intended to include the meanings equivalent to the claims and all modifications within the scope.

Claims

1. An electric storage device, wherein the electric storage device is provided with: an electric storage module including a plurality of electric storage cells; a case accommodating the electric storage module; an adhesive member adhering the plurality of electric storage cells to the case; and an exhaust valve provided to the case, an exhaust passage is formed in the adhesive member so as to extend toward the exhaust valve.

2. The electric storage device according to claim 1, wherein the case includes: a covering portion provided so as to cover the plurality of electric storage cells from one side in a first direction and adhere to the plurality of electric storage cells by the adhesive member; a peripheral wall portion provided so as to surround the plurality of electric storage cells as viewed from the one side and provided with the exhaust valve; and a partition wall portion dividing a plurality of spaces in the case accommodating the plurality of electric storage cells as viewed from the one side, the exhaust passage extends from the partition wall portion toward the exhaust valve of the peripheral wall portion as viewed from the one side.

3. The electric storage device according to claim 2, wherein the plurality of electric storage cells are respectively formed longer in a second direction as viewed from the one side, an exhaust portion is formed at one end in the second direction of each of the plurality of electric storage cells, the plurality of electric storage cells are arranged in a third direction intersecting the second direction as viewed from the one side, the partition wall portion includes a first partition wall extending in the third direction, the plurality of electric storage cells are arranged so that the plurality of exhaust portions are arranged in the third direction along the first partition wall.

4. The electric storage device according to claim 3, wherein the peripheral wall portion includes a first side wall extending in the third direction, the exhaust valve is provided to the first side wall, the exhaust passage is formed so as to extend in the second direction between the first partition wall and the first side wall.

5. The electric storage device according to claim 3 or 4, wherein the partition wall portion includes a second partition wall extending in the second direction, a cross exhaust passage extending from the second partition wall toward the peripheral wall portion and intersecting the exhaust passage is formed in the adhesive member.

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