Electricity storage device

Abstract

This electricity storage device is provided with: an electricity storage module comprising a plurality of electricity 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 Art

[0002] Japanese Patent Application Laid-Open No. 2021-111520 discloses a battery pack including a plurality of battery cells and a battery pack case. The plurality of battery cells are bonded to a floor surface of the battery pack case.

[0003] In the battery pack described in Japanese Patent Application Laid-Open No. 2021-111520, it is considered that the adhesive bonding the battery cells to the battery pack case prevents the smoke generated in the battery cells (storage cells) from being discharged to the outside of the case. Summary of the Invention

[0004] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a power storage device that can easily discharge smoke generated in a power storage cell to the outside of a casing.

[0005] One aspect of the present disclosure relates to an electric storage device comprising: an electric storage module including a plurality of electric storage cells; a housing accommodating the electric storage module; an adhesive member bonding the plurality of electric storage cells to the housing; and a smoke exhaust valve disposed in the housing. The adhesive member is formed with a smoke exhaust passage extending toward the smoke exhaust valve.

[0006] In the power storage device according to one aspect of the present disclosure, as described above, a smoke exhaust passage extending toward the smoke exhaust valve is formed in the adhesive member. This allows smoke generated by the power storage cells to be easily transferred to the smoke exhaust valve via the smoke exhaust passage. As a result, smoke generated by the power storage cells can be easily discharged outside the housing.

[0007] The shell may also include: a covering portion, which is configured to cover the multiple storage cells from one side in the first direction and is bonded to the multiple storage cells by an adhesive component; a peripheral wall portion, which is configured to surround the multiple storage cells when viewed from the above-mentioned side and is provided with a smoke exhaust valve; and a partition portion, which, when viewed from the above-mentioned side, divides the space within the shell that accommodates the multiple storage cells. When viewed from one side, the smoke exhaust passage may also extend from the partition portion toward the smoke exhaust valve of the peripheral wall portion. Here, smoke from the storage cells is easily accumulated in the partition portion provided between the storage cells. Therefore, the extension of the smoke exhaust passage from the partition portion toward the smoke exhaust valve is particularly effective in exhausting smoke outside the shell.

[0008] When viewed from the above-mentioned side, the plurality of storage cells may also be formed longer in the second direction. An exhaust portion may also be formed at one end of each of the plurality of storage cells in the second direction. When viewed from the above-mentioned side, the plurality of storage cells may also be arranged in a third direction intersecting the second direction. The partition portion may also include a first partition extending in the third direction. The plurality of storage cells may also be configured as a plurality of exhaust portions arranged in the third direction along the first partition. With such a structure, smoke exhausted from the plurality of exhaust portions arranged along the first partition can easily flow into the smoke exhaust passage extending from the first partition toward the smoke exhaust valve.

[0009] The peripheral wall portion may also include a first side wall extending in the third direction. The smoke exhaust valve may also be provided on the first side wall. The smoke exhaust passage may also be formed to extend in the second direction between the first partition wall and the first side wall. With such a structure, the length of the smoke exhaust passage can be reduced compared to a case where the smoke exhaust passage extends in a curved manner between the first partition wall and the first side wall. As a result, smoke can be quickly exhausted through the smoke exhaust passage.

[0010] The partition wall portion may also include a second partition wall extending in the second direction. A cross smoke exhaust passage may also be formed in the adhesive member, extending from the second partition wall toward the peripheral wall portion and intersecting the smoke exhaust passage. With this structure, smoke generated in the battery cell can be exhausted outside the housing through the cross smoke exhaust passage. As a result, smoke within the housing can be exhausted more efficiently.

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

[0012] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, wherein like reference numerals denote like elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a diagram showing the configuration of a vehicle equipped with a power storage device according to one embodiment.

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

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

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

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

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

[0019] Figure 7 It is a partially enlarged plan view showing the structure of a power storage device according to one embodiment.

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

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

[0022] Below, embodiments and modifications according to the present disclosure are described with reference to the accompanying drawings. In the following description, identical components and constituent elements are denoted by the same reference numerals. The names and functions of these components are also identical. Therefore, detailed descriptions of identical components and constituent elements will not be repeated. In addition, the embodiments and modifications described below may also be selectively combined as appropriate.

[0023] Reference Figures 1 to 8 , the power storage device involved in this embodiment is described. Figure 1 : is a side view schematically showing a vehicle 900 equipped with the power storage device 1 involved in the present embodiment. In addition, the X direction, Y direction and Z direction in this specification are directions that are orthogonal to each other. For example, the X direction and the Y direction are the front-to-back direction and the width direction of the vehicle 900, respectively, when the vehicle 900 is equipped with the power storage device 1. In addition, the Z direction is the up-down (vertical) direction of the vehicle 900. In addition, the X direction and the Y direction are examples of the "second direction" and the "third direction" of the present disclosure, respectively. 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 arranged on the floor panel 913 ( Figure 2 ). Examples of vehicle 900 include a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, and an electric vehicle. Vehicle 900 includes a power storage device 1 and a vehicle frame 910.

[0025] Figure 2 1 is an exploded perspective view schematically showing the power storage device 1 and the vehicle frame 910. 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 arranged at the bottom of the vehicle frame 910. The left frame 911 and the right frame 912 are arranged with a gap in the width direction (Y direction) of the vehicle 900. In addition, the left frame 911 and the right frame 912 are arranged to extend in the front-rear direction (X direction) of the vehicle 900.

[0027] A 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 1 is a perspective view schematically showing the power storage device 1. Figure 3 The power storage device 1 includes a power storage module 100 including a plurality of power storage cells 10, a housing 200 for accommodating the power storage module 100, and an adhesive layer 300 ( Figure 5 ) and exhaust valve 250. In addition, Figure 3 , the adhesive layer 300 is omitted for simplicity. The adhesive layer 300 is an example of the "adhesive member" in the present disclosure.

[0029] The storage cell 10 is a secondary battery, typically a lithium-ion secondary battery. A lithium-ion secondary battery uses lithium as a charge carrier. In addition to lithium-ion secondary batteries with liquid electrolytes, they also include all-solid-state batteries using solid electrolytes. Furthermore, the storage cell 10 is not limited to lithium-ion secondary batteries and may also be a nickel-metal hydride secondary battery or other secondary battery.

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

[0031] The housing 200 includes an upper cover 210 and a lower housing 220. Figure 3 , the power storage device 1 is shown with the upper cover 210 removed. The upper cover 210 is an example of a "covering portion" in the present disclosure.

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

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

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

[0035] The peripheral wall portion 222 is formed to extend upward from the outer periphery of the bottom plate 221 toward the top of the vehicle 900. The peripheral wall portion 222 is formed in an annular shape. When viewed from the Z1 side, the peripheral wall portion 222 is provided to surround the plurality of storage cells 10 (storage module 100). "Viewed from the Z1 side" means "viewed from a point P separated from the storage module 100 and the peripheral wall portion 222 on the Z1 side."

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

[0037] When viewed from the Z1 side, the partition walls 223, 226, and 227 define a plurality of spaces within the case 200 that accommodate the plurality of storage cells 10. In other words, when viewed from the Z1 side, the partition walls 223, 226, and 227 are provided to separate the spaces (S1 to S4 described later) that accommodate the plurality of storage cells 10 from each other.

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

[0039] Partition wall 227 is located at the center of lower case 220 in the X direction. Partition wall 223 and partition wall 226 are located at the center of lower case 220 in the Y direction. Partition wall 223 is located closer to the X1 side than partition wall 227. Partition wall 226 is located closer to the X2 side than partition wall 227. Partition wall 224 is provided so as to extend in the X direction on the Y1 side of the plurality of storage cells 10. Partition wall 225 is provided so as to extend in the X direction on the Y2 side of the plurality of storage cells 10.

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

[0041] The holes 220a, 220b, and 220c are formed to extend in the X direction between the side wall 222a and the partition wall 224. The hole 220a is provided on the X1 side of the hole 220b. The hole 220c is provided on the X2 side of the hole 220b.

[0042] Hole 220d, hole 220e, and hole 220f are each formed to extend in the X direction between side wall 222b and partition wall 225. Hole 220d is provided on the X1 side of hole 220e. Hole 220f is provided on the X2 side of hole 220e. Holes 220a to 220f do not need to 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 holes 220a and 220b to connect the partition wall 224 to the side wall 222a. The partition wall 220h extends in the Y direction between the holes 220b and 220c to connect the partition wall 224 to the side wall 222a.

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

[0046] The partition walls 223, 224, 225, 226, 227, 220g, 220h, 220i, and 220j are not bonded to the upper cover 210. The upper cover 210 is formed to be more easily deformed than the lower case 220, for example.

[0047] Therefore, when the internal pressure near the aforementioned partition walls increases due to smoke, the upper cover 210 expands toward the Z1 direction at that location. As a result, gaps are created between the aforementioned partition walls and the upper cover 210. In this case, smoke passes through these gaps and circulates within the lower housing 220.

[0048] Multiple storage cells 10 are arranged in spaces S1 to S4 within the lower case 220. Space S1 is surrounded by partition walls 223, 224, 227, and sidewall 222c. Space S2 is surrounded by partition walls 226, 224, 227, and sidewall 222d. An area E, where unillustrated equipment and other devices are located, is provided between sidewall 222c and the storage module 100.

[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 shell 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 For example, holes for inserting bolts are formed in the support portion 228 and the support portion 229. By inserting the bolts into the holes, the plurality of support portions 228 are fixed to the left frame 911 ( Figure 2 ), and fix the plurality of support parts 229 to the right frame 912 ( Figure 2 ).

[0051] The smoke exhaust valve 250 is provided in the lower housing 220. Specifically, the smoke exhaust valve 250 is provided on each of the side walls 222c and 222d. Two smoke exhaust valves 250 are provided on each of the side walls 222c and 222d. The smoke exhaust valve 250 is provided on each of the side walls 222c and 222d, respectively, at positions on the Y1 side and the Y2 side relative to the partition wall 223 (partition wall 226).

[0052] Figure 4 An example of the storage cell 10 is shown. Figure 4 The 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. In addition, the short side surface 13 is an example of "one end" in the present disclosure.

[0053] The upper surface 11 and the lower surface 12 are surfaces in the Z direction of the storage cell 10. Specifically, the upper surface 11 is the end surface on the Z1 side of the storage cell 10. The lower surface 12 is the end surface on the Z2 side of the storage cell 10 and is located on the opposite side of 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 of the storage cell 10. Specifically, the short side surface 13 and the short side surface 14 are one end surface and the other end surface in the X direction of the storage cell 10, respectively.

[0055] The long side surface 15 and the long side surface 16 are surfaces in the Y direction of the storage cell 10. Specifically, the long side surface 15 and the long side surface 16 are one end surface and the other end surface in the Y direction of the storage cell 10, respectively.

[0056] The storage cell 10 is formed to be elongated in the X direction. Specifically, the width W1 of the storage cell 10 in the X direction is greater than the width W2 of the storage cell 10 in the Y direction. Furthermore, the width W1 is greater than the height H of the storage cell 10 in the Z direction. Furthermore, the height H is greater than the width W2.

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

[0058] The battery cell 10 also includes a battery cell exhaust valve 19 for exhausting the gas inside the battery cell 10. The battery cell exhaust valve 19 is configured to exhaust the gas (smoke) inside the battery cell 10 to the outside of the battery cell 10 when the internal pressure of the battery cell 10 rises. The battery cell exhaust valve 19 is provided on the side of the battery cell 10. Figure 4 In the example shown, the cell smoke exhaust valve 19 is provided on the short side surface 13 where the negative terminal 18 is provided. Alternatively, the cell smoke exhaust valve 19 may be provided on the short side surface 14, the long side surface 15, or the long side surface 16. The cell smoke exhaust valve 19 is an example of an "exhaust portion" in the present disclosure.

[0059] Figure 5 This is a top view of the power storage device 1 with the upper cover 210 removed. The adhesive layer 300 is disposed on the power storage module 100. Specifically, the adhesive layer 300 is disposed (applied) on the upper surface 11 of each of the plurality of power storage cells 10. Thus, the adhesive layer 300 bonds the plurality of power storage cells 10 to the upper cover 210.

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

[0061] Here, in conventional power storage devices, it is considered that the adhesive material bonding the power storage cell and the case prevents the smoke generated in the power storage cell from being discharged outside the case.

[0062] Therefore, in this embodiment, a smoke exhaust passage 310 extending 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 not filled with adhesive material) below the upper cover 210.

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

[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 of 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 of 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 of 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 of the side wall 222d.

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

[0067] Furthermore, the phrase "the smoke exhaust passage 310 extends from the partition wall 227" also includes a case where the smoke exhaust passage 310 extends from the vicinity of the partition wall 227 and a small gap is formed between the smoke exhaust passage 310 and the partition wall 227. Hereinafter, when the same expression is used, it shall be defined in the same manner.

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

[0069] Adhesive layer 300 in each of spaces S1 to S4 forms a smoke exhaust passage 320 that intersects with smoke exhaust passage 310. Smoke exhaust passage 320 is formed by providing a cavity (a space not filled with adhesive material) below upper cover 210. Each smoke exhaust passage 320 is formed to extend in the Y direction. In each of spaces S1 to S4, smoke exhaust passage 310 and smoke exhaust passage 320 are orthogonal. Smoke exhaust passage 320 is an example of a "crossing smoke exhaust passage" in the present disclosure.

[0070] The smoke exhaust passage 310 and the smoke exhaust passage 320 are connected at the intersection of the smoke exhaust passage 310 and the smoke exhaust passage 320. That is, smoke may move between the smoke exhaust passage 310 and the smoke exhaust passage 320.

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

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

[0073] Thus, smoke accumulated near the partition wall 223 and the partition wall 226 can move toward the side wall 222a or the side wall 222b through the smoke exhaust passage 320. In addition, smoke moving from the smoke exhaust passage 320 to the smoke exhaust passage 310 can be discharged outside the housing 200 through the smoke exhaust valve 250.

[0074] Furthermore, smoke exhaust passage 320 is provided at the center of each of spaces S1 to S4 in the X direction. In each of spaces S1 to S4, smoke exhaust passage 320 extends from the end of adhesive layer 300 on the Y1 side to the end on the Y2 side. Therefore, in each of spaces S1 to S4, smoke exhaust passage 310 and smoke exhaust passage 320 divide adhesive layer 300 into four sections.

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

[0076] Reference Figure 6 In the power storage device 1 , the power storage cells 10 arranged with the short side surfaces 13 facing the X2 side and the power storage cells 10 arranged with the short side surfaces 14 facing the X2 side are alternately arranged along the Y direction.

[0077] Thus, the cell smoke exhaust valves 19 formed on the short side surfaces 13 are arranged in the Y direction. Furthermore, the storage cells 10 adjacent to each other in the Y direction are arranged so that the positive electrode terminals 17 and the negative electrode terminals 18 are adjacent to each other.

[0078] like Figure 6As shown, the upper surface 11 of the storage 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. Alternatively, an adhesive layer with a relatively small thickness (thickness in the Z direction) may 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 ( Figure 4 The smoke exhaust passage 310 is formed so that the width W11 is constant at each position in the X direction. In addition, the width W11 may be greater than the width W2.

[0080] When viewed along the X-direction, the smoke exhaust passage 310 has a rectangular shape. The shape of the smoke exhaust passage 310 when viewed along the X-direction is not limited to the above example. Furthermore, "viewing the smoke exhaust passage 310 along 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 power storage device 1 further includes a cooler 400 for cooling the power storage cells 10. The cooler 400 has a cooling surface 410 on which the plurality of power storage cells 10 are arranged. The cooling surface 410 is an end surface on the Z1 side of the cooler 400. The cooler 400 (cooling surface 410) is provided along the lower surface 12 of the power storage cells 10. Figure 6 , an example is shown in which no adhesive material (adhesive layer) is provided between the cooling surface 410 and the lower surface 12 of the storage cell 10 , but an adhesive material (adhesive layer) may be provided at this position.

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

[0083] The power 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 on one of two storage cells 10 adjacent to each other in the Y direction to the negative electrode terminal 18 provided on the other of the two storage cells 10.

[0084] Figure 7 This is a top view of the plurality of storage cells 10 in the space S1 as viewed from the Z1 side. Figure 7 In the figure, the adhesive layer 300 is omitted for simplicity. Figure 7 , the configuration corresponding to the space S1 is representatively shown in the figure, but the configuration corresponding to the spaces S2 to S4 is also the same.

[0085] like Figure 7As shown, the plurality of storage cells 10 are arranged such that the plurality of cell exhaust valves 19 are arranged in the Y direction along the partition wall 227. Specifically, the cell exhaust valves 19 of the plurality of storage cells 10 whose short side surfaces 13 face the partition wall 227 are arranged in the Y direction. Thus, smoke is exhausted from the plurality of cell exhaust valves 19 arranged along the partition wall 227 toward the partition wall 227. At least a portion of the smoke exhausted toward the partition wall 227 passes through the smoke exhaust passage 310 and exits the smoke exhaust valve 250 ( Figure 5 )discharge.

[0086] In addition, a 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 storage cells 10 with the short side 13 facing the side wall 222c are arranged in the Y direction. As a result, smoke is exhausted from the plurality of cell smoke exhaust valves 19 arranged along the side wall 222c toward the side wall 222c. At least a portion of the smoke exhausted toward the side wall 222c is discharged from the smoke exhaust valve 250 ( Figure 5 )discharge.

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

[0088] like Figure 8 As shown, the upper surface 11 of the storage cell 10 is exposed at the position corresponding to the exhaust passage 320. In other words, no adhesive layer is provided on the Z2 side of the exhaust passage 320. Alternatively, an adhesive layer with a relatively small thickness (thickness in the Z direction) may be provided on the Z2 side of the exhaust passage 320.

[0089] The smoke exhaust passage 320 has a width W12 in the Y direction. The smoke exhaust passage 320 is formed so that the width W12 at each position in the Y direction is constant. In addition, the width W12 may also be equal to the width W11 ( Figure 6 )equal.

[0090] When viewed along the Y direction, the smoke exhaust passage 320 has a rectangular shape. The shape of the smoke exhaust passage 310 when viewed along the Y direction is not limited to the above example. Furthermore, "viewing the smoke exhaust passage 320 along the Y direction" means viewing the smoke exhaust passage 320 from a position opposite the smoke exhaust passage 320 in the Y direction.

[0091] As described above, in the above embodiment, the adhesive layer 300 is formed with the smoke exhaust passage 310 extending toward the smoke exhaust valve 250. This allows smoke generated from the storage cells 10 to flow through the smoke exhaust passage 310 toward the smoke exhaust valve 250. As a result, the flow of smoke within the housing 200 can be prevented from being blocked by the adhesive layer 300. This facilitates the exhaust of smoke within the housing 200.

[0092] In the above embodiment, the smoke exhaust passage 310 and the smoke exhaust passage 320 are formed in the adhesive layer 300 , but the present disclosure is not limited thereto.

[0093] For example, in Figure 9 In the illustrated example, in addition to exhaust passages 310 and 320, exhaust passages 330 and 340 are formed in adhesive layer 300. Exhaust passages 330 and 340 are provided in each of spaces S1 to S4. Exhaust passage 330 is provided on the Y1 side relative to exhaust passage 310. Exhaust passage 340 is provided on the Y2 side relative to exhaust passage 310.

[0094] Smoke exhaust passage 330 and smoke exhaust passage 340 each extend from partition wall 227 to smoke exhaust passage 310. Smoke exhaust passage 330 and smoke exhaust passage 340 each intersect (connect) with smoke exhaust passage 310. The intersection of each of smoke exhaust passage 330 and smoke exhaust passage 340 with smoke exhaust passage 310 is located closer to partition wall 227 than smoke exhaust passage 320.

[0095] In the embodiment, the smoke exhaust passage 310 and the smoke exhaust passage 320 are formed on the adhesive layer 300 , but the present disclosure is not limited thereto. The adhesive layer 300 may have only the smoke exhaust passage 310 instead of the smoke exhaust passage 320 .

[0096] In the above embodiment, the smoke exhaust passage 310 is shown as extending from the partition wall 227 toward the smoke exhaust valve 250, but the present disclosure is not limited thereto. The smoke exhaust passage 310 may extend toward the smoke exhaust valve 250 from a position different from the partition wall 227 (e.g., the partition walls 224, 225, etc.). Furthermore, the smoke exhaust passage 310 may not extend to the end of the adhesive layer 300 on the side of the partition wall 227. Furthermore, the smoke exhaust passage 310 may not extend to the end of the adhesive layer 300 on the side of the smoke exhaust valve 250.

[0097] In the above embodiment, the smoke exhaust valve 250 is respectively provided on the sidewall 222c and the sidewall 222d of the lower housing 220, but the present disclosure is not limited thereto. The smoke exhaust valve 250 may also be provided on the sidewalls 222a and 222b of the lower housing 220.

[0098] In the above embodiment, the smoke exhaust passage 310 is shown as extending in the X direction, but the present disclosure is not limited to this. When viewed from the Z1 side, the smoke exhaust passage 310 may extend in directions intersecting the X direction and the Y direction toward the smoke exhaust valve 250. Furthermore, when viewed from the Z1 side, the smoke exhaust passage 320 may extend in directions intersecting the X direction and the Y direction.

[0099] In the above embodiment, each of the spaces S1 to S4 is provided with one exhaust passage 310 and one exhaust passage 320, but the present disclosure is not limited thereto. A plurality of exhaust passages 310 and a plurality of exhaust passages 320 may be provided in each of the spaces S1 to S4.

[0100] In the above embodiment, the positive electrode terminal 17 and the negative electrode terminal 18 are provided on different surfaces, but the present disclosure is not limited thereto. The positive electrode terminal 17 and the negative electrode terminal 18 may be provided on the same surface (short side surface 13 or short side surface 14).

[0101] In the above embodiment, the cooler 400 is shown as being located below the storage cell 10, but the present disclosure is not limited thereto. The cooler may also be located above the storage cell. In this case, the adhesive material forming the smoke exhaust passage may also bond the lower surface 12 of the storage cell 10 to the lower case 220.

[0102] In the above embodiment, the plurality of storage cells 10 are arranged in the Y direction perpendicular to (intersecting) the Z direction (vertical direction), but the present disclosure is not limited thereto. For example, the plurality of storage cells 10 may be arranged (stacked) in the Z direction.

[0103] In the above embodiment, the spaces (S1 to S4) for arranging multiple storage cells 10 are divided into sections, but the present disclosure is not limited to this. For example, the spaces for arranging the storage cells 10 may not be divided. In other words, only one space for arranging multiple storage cells 10 may be formed.

[0104] In the above embodiment, the power storage device 1 is mounted on the vehicle 900, but the present disclosure is not limited thereto. The power storage device 1 may be provided in an electrical device other than the vehicle (eg, a stationary power storage device).

[0105] In the above embodiment, the adhesive layer 300 is formed by applying a gel-like adhesive material to the storage cells 10. However, the present disclosure is not limited thereto. For example, the adhesive layer may be formed by placing a sheet-like adhesive member across the upper surfaces 11 of a plurality of storage cells 10.

[0106] In the above embodiment, the smoke exhaust passage 310 is formed so that its width W11 is constant at each position in the X direction. However, the present disclosure is not limited to this. For example, the width W11 of the smoke exhaust passage 310 in the Y direction may gradually decrease from the partition wall 227 toward the smoke exhaust valve 250. Similarly, the width W12 of the smoke exhaust passage 320 in the X direction may gradually decrease from the partition wall 223 (226) toward the peripheral wall portion 222 (222a, 222b).

[0107] In the above embodiment, an example is shown in which the exhaust passage 310 and the exhaust passage 320 intersect (the exhaust passages are connected to each other), but the present disclosure is not limited to this. For example, the position of the exhaust passage extending in the X direction in the Z direction may be offset from the position of the exhaust passage extending in the Y direction in the Z direction, thereby eliminating the need for connecting the two exhaust passages.

[0108] The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is not limited by the above description but is indicated by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.

Claims

1. A power storage device, wherein: The power storage device comprises: A storage module, comprising a plurality of storage cells; a housing for accommodating the battery module; a bonding member for bonding the plurality of storage cells to the casing; and A smoke exhaust valve is provided on the housing. The adhesive member has a smoke exhaust passage formed therein, the smoke exhaust passage extending toward the smoke exhaust valve.

2. The power storage device according to claim 1, wherein The housing comprises: a covering portion, arranged to cover the plurality of storage cells from one side in the first direction and bonded to the plurality of storage cells via the bonding member; a peripheral wall portion, arranged to surround the plurality of storage cells when viewed from the one side, and provided with the smoke exhaust valve; and The partition wall, viewed from the one side, divides the space in the housing into a plurality of spaces for accommodating the plurality of storage cells. The smoke exhaust passage extends from the partition wall portion toward the smoke exhaust valve of the peripheral wall portion when viewed from the one side.

3. The power storage device according to claim 2, wherein When viewed from the one side, the plurality of storage cells are each formed to be elongated in the second direction. A vent is formed at one end of each of the plurality of storage cells in the second direction. When viewed from the one side, the plurality of storage cells are arranged in a third direction intersecting the second direction. The partition wall portion includes a first partition wall extending in the third direction, The plurality of storage cells are arranged so that the plurality of exhaust portions are aligned in the third direction along the first partition wall.

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

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

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