Power storage device

Abstract

To provide a power storage device that can easily exhaust smoke generated in a power storage cell to the outside of a case.SOLUTION: A 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 that bonds the plurality of power storage cells 10 to the case 200, and a smoke exhaust valve 250 provided in the case 200. A smoke exhaust passage 310 extending toward the smoke exhaust valve 250 is formed in the adhesive layer 300.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Japanese Patent Application Laid-Open Publication No. 2021-111520 (Patent Document 1) discloses a battery pack including a plurality of battery cells and a battery pack case. The plurality of battery cells are adhered to the floor surface of the battery pack case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-111520 Summary of the Invention [Problem to be solved by the invention]

[0004] In the battery pack described in Patent Document 1, the adhesive that bonds the battery cells to the battery pack case may prevent smoke generated in the battery cells (electricity storage cells) from being discharged to the outside of the case.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an electricity storage device that can easily exhaust smoke generated in an electricity storage cell to the outside of the case. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an energy storage device including: an energy storage module including a plurality of energy storage cells; a case for accommodating the energy storage module; an adhesive member for adhering the plurality of energy storage cells to the case; and a smoke exhaust valve provided in the case. The adhesive member has a smoke exhaust passage formed therein and extending toward the smoke exhaust valve.

[0007] In the energy storage device according to one aspect of the present disclosure, as described above, the adhesive member has a smoke exhaust passage extending toward the smoke exhaust valve. This allows smoke generated in the energy storage cells to easily move to the smoke exhaust valve via the smoke exhaust passage. As a result, smoke generated in the energy storage cells can be easily discharged outside the case.

[0008] The case may include a covering portion that covers the plurality of storage cells from one side in the first direction and is bonded to the plurality of storage cells with an adhesive member; a peripheral wall portion that surrounds the plurality of storage cells as viewed from the one side and is provided with a smoke exhaust valve; and a partition portion that divides the space inside the case in which the plurality of storage cells are housed into multiple sections as viewed from the one side. The smoke exhaust passage may extend from the partition portion toward the smoke exhaust valve of the peripheral wall as viewed from the one side. Here, smoke from the storage cells tends to accumulate in the partition portion provided between the storage cells. Therefore, extending the smoke exhaust passage from the partition portion toward the smoke exhaust valve is particularly effective in discharging smoke to the outside of the case.

[0009] Each of the plurality of storage cells may be formed elongated in the second direction when viewed from the one side. An exhaust portion may be formed at one end of each of the plurality of storage cells in the second direction. The plurality of storage cells may be arranged in a third direction intersecting the second direction when viewed from the one side. The partition portion may include a first partition wall extending in the third direction. The plurality of storage cells may be arranged such that the plurality of exhaust portions are arranged in the third direction along the first partition wall. With this configuration, smoke discharged from the plurality of exhaust portions arranged along the first partition wall can be easily flowed into the smoke exhaust passage extending from the first partition wall toward the smoke exhaust valve.

[0010] The peripheral wall portion may include a first side wall extending in the third direction. The smoke exhaust valve may be provided on the first side wall. The smoke exhaust passage may be formed to extend in the second direction between the first partition wall and the first side wall. With this configuration, the length of the smoke exhaust passage can be made shorter than when the smoke exhaust passage extends so as to bend between the first partition wall and the first side wall. As a result, smoke can be quickly exhausted through the smoke exhaust passage.

[0011] The partition wall portion may include a second partition wall extending in the second direction. The adhesive member may have a crossing smoke exhaust passage extending from the second partition wall toward the peripheral wall portion and intersecting with the smoke exhaust passage. With this configuration, smoke generated in the energy storage cells can be discharged to the outside of the case through the crossing smoke exhaust passage. As a result, smoke inside the case can be more efficiently discharged to the outside of the case. [Effects of the Invention]

[0012] According to the present disclosure, smoke generated in the electricity storage cell can be easily discharged to the outside of the case. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a configuration of a vehicle equipped with a power storage device according to an embodiment; [Figure 2] 1 is an exploded perspective view showing a configuration of an electricity storage device and a vehicle frame according to an embodiment; [Figure 3] FIG. 2 is an exploded perspective view showing a detailed configuration of the electricity storage device according to the embodiment. [Figure 4] FIG. 1 is a perspective view illustrating a configuration of a storage cell according to an embodiment. [Figure 5] 1 is a plan view illustrating a configuration of an electricity storage device according to an embodiment. [Figure 6] 1 is a first cross-sectional view showing the configuration of an electricity storage device according to an embodiment. [Figure 7] 1 is a partially enlarged plan view showing a configuration of an electricity storage device according to an embodiment. [Figure 8]FIG. 2 is a second cross-sectional view showing the configuration of the electricity storage device according to the embodiment. [Figure 9] FIG. 10 is a plan view showing the configuration of a power storage device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments and modifications according to the present disclosure will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. Note that the embodiments and modifications described below may be selectively combined as appropriate.

[0015] The power storage device according to this embodiment will be described with reference to FIGS. 1 to 8. FIG. 1 is a side view schematically showing a vehicle 900 including the power storage device 1 according to this embodiment. In this specification, the X direction, Y direction, and Z direction are directions that are perpendicular to one another. For example, the X direction and the Y direction are the front-rear direction and the width direction of the vehicle 900 when the power storage device 1 is mounted on the vehicle 900, respectively. The Z direction is the up-down (vertical) direction. The X direction and the Y direction are examples of the "second direction" and the "third direction," respectively, in the present disclosure. The Z direction is the "first direction" in the present disclosure. The Z1 side is an example of "one side of the first direction" in the present disclosure.

[0016] 1, the power storage device 1 is disposed below a floor panel 913 (FIG. 2) of a vehicle 900. Examples of the vehicle 900 include a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, and an electric vehicle. The vehicle 900 includes the power storage device 1 and a vehicle frame 910.

[0017] 2 is an exploded perspective view schematically showing the power storage device 1 and a vehicle frame 910. Referring to FIG.

[0018] 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 at an interval in the width direction (Y direction) of the vehicle 900. Furthermore, each of the left frame 911 and the right frame 912 is disposed so as to extend in the front-rear direction (X direction) of the vehicle 900.

[0019] 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 fixed to the left frame 911 and the right frame 912.

[0020] Fig. 3 is a perspective view schematically illustrating the energy storage device 1. Referring to Fig. 3, the energy storage device 1 includes an energy storage module 100 including a plurality of energy storage cells 10, a case 200 that houses the energy storage module 100, an adhesive layer 300 (Fig. 5), and a smoke exhaust valve 250. For simplification, the adhesive layer 300 is not shown in Fig. 3. The adhesive layer 300 is an example of the "adhesive member" of the present disclosure.

[0021] The storage cell 10 is a secondary battery, typically a lithium-ion secondary battery. A lithium-ion secondary battery is a battery that uses lithium as a charge carrier, and may include not only lithium-ion secondary batteries that use a liquid electrolyte, but also all-solid-state batteries that use a solid electrolyte. Note that the storage cell 10 is not limited to a lithium-ion secondary battery, and may be composed of a nickel-metal hydride secondary battery or other secondary batteries.

[0022] Each of the plurality of energy storage cells 10 is arranged to extend in the front-rear direction (X direction) of the vehicle 900 (see FIG. 1). The plurality of energy storage cells 10 are also arranged in the width direction (Y direction) of the vehicle 900.

[0023] Case 200 includes an upper cover 210 and a lower case 220. Fig. 3 shows power storage device 1 with upper cover 210 removed. Note that upper cover 210 is an example of the "covering portion" of the present disclosure.

[0024] The upper cover 210 is provided so as to cover the plurality of energy storage cells 10 (energy storage module 100) from the Z1 side.

[0025] Lower case 220 includes a bottom plate 221, a peripheral wall portion 222, and a plurality of partition walls 223, 224, 225, 226, and 227. Partition walls 223, 224, 225, 226, and 227 divide the space inside case 200 into a plurality of sections. Partition walls 223, 224, 225, 226, and 227 are provided on bottom plate 221.

[0026] The bottom plate 221 is formed in a flat plate shape and is provided so as to support the plurality of energy storage cells 10 (energy storage modules 100) from the Z2 side.

[0027] The peripheral wall portion 222 is formed to extend from the outer peripheral edge portion 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 energy storage cells 10 (energy storage modules 100). Note that "when viewed from the Z1 side" means "when viewed from a point P that is spaced apart on the Z1 side from the energy storage modules 100 and the peripheral wall portion 222."

[0028] 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 on the Y1 side of the power storage module 100 and extends in the X direction. The side wall 222b is provided on the Y2 side of the power storage module 100 and extends in the X direction. The side wall 222c is provided on the X1 side of the power storage module 100 and extends in the Y direction. The side wall 222d is provided on the X2 side of the power storage module 100 and extends in the Y direction. Each of the side wall 222c and the side wall 222d is an example of a "first side wall" in the present disclosure.

[0029] When viewed from the Z1 side, the partition walls 223, 226, and 227 divide the space inside the case 200 into a plurality of sections in which the plurality of storage cells 10 are housed. In other words, when viewed from the Z1 side, the partition walls 223, 226, and 227 are provided so as to separate the spaces (S1 to S4 described below) in which the plurality of storage cells 10 are housed from each other.

[0030] 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 walls 223 and 226 are each an example of a "second partition wall" and a "partition wall portion" in the present disclosure.

[0031] The partition wall 227 is disposed in the center of the lower case 220 in the X direction. The partition walls 223 and 226 are each disposed in the center of the lower case 220 in the Y direction. The partition wall 223 is disposed on the X1 side of the partition wall 227. The partition wall 226 is disposed on the X2 side of the partition wall 227. The partition wall 224 is provided to extend in the X direction on the Y1 side of the multiple storage cells 10. The partition wall 225 is provided to extend in the X direction on the Y2 side of the multiple storage cells 10.

[0032] The lower case 220 is formed with a hole 220a, a hole 220b, a hole 220c, a hole 220d, a hole 220e, and a hole 220f.

[0033] Hole 220a, hole 220b, and hole 220c are each formed to extend in the X direction between side wall 222a and partition wall 224. Hole 220a is provided on the X1 side of hole 220b. Hole 220c is provided on the X2 side of hole 220b.

[0034] 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. Note that holes 220a to 220f do not necessarily have to be formed in the lower case.

[0035] The lower case 220 includes a partition wall 220g, a partition wall 220h, a partition wall 220i, and a partition wall 220j.

[0036] Partition wall 220g extends in the Y direction between hole 220a and hole 220b to connect partition wall 224 and side wall 222a. Partition wall 220h extends in the Y direction between hole 220b and hole 220c to connect partition wall 224 and side wall 222a.

[0037] Partition wall 220i extends in the Y direction between hole 220d and hole 220e to connect partition wall 225 and side wall 222b. Partition wall 220j extends in the Y direction between hole 220e and hole 220f to connect partition wall 225 and side wall 222b.

[0038] It should be noted that partition wall 223, partition wall 224, partition wall 225, partition wall 226, partition wall 227, partition wall 220g, partition wall 220h, partition wall 220i, and partition wall 220j are not bonded to upper cover 210. Furthermore, upper cover 210 is formed to be relatively easy to deform compared to, for example, lower case 220, etc.

[0039] As a result, when internal pressure due to smoke increases near the partition walls, upper cover 210 expands toward Z1 at that position. As a result, gaps are formed between the partition walls and upper cover 210. In this case, smoke passes through the gaps and circulates inside lower case 220.

[0040] The plurality of energy storage cells 10 are arranged in spaces S1 to S4 within the lower case 220. Space S1 is a space surrounded by partition walls 223, 224, 227, and side wall 222c. Space S2 is a space surrounded by partition walls 226, 224, 227, and side wall 222d. Between side wall 222c and the energy storage module 100, there is provided an area E in which devices (not shown) are arranged.

[0041] Space S3 is a space surrounded by partition wall 225, partition wall 223, partition wall 227, and side wall 222c. Space S4 is a space surrounded by partition wall 225, partition wall 226, partition wall 227, and side wall 222d.

[0042] Lower case 220 further includes a plurality of support portions 228 and a plurality of support portions 229. Each of support portions 228 and support portions 229 is fixed to vehicle frame 910 (FIG. 2). For example, each of support portions 228 and support portions 229 is formed with a hole into which a bolt is fitted. By fitting the bolt into the hole, each of the plurality of support portions 228 is fixed to left frame 911 (FIG. 2), and each of the plurality of support portions 229 is fixed to right frame 912 (FIG. 2).

[0043] The smoke vent valve 250 is provided in the lower case 220. Specifically, the smoke vent valve 250 is provided in each of the side walls 222c and 222d. Two smoke vent valves 250 are provided in each of the side walls 222c and 222d. In each of the side walls 222c and 222d, the smoke vent valves 250 are provided at positions on the Y1 side and the Y2 side of the partition wall 223 (partition wall 226).

[0044] Fig. 4 shows an example of a storage cell 10. Referring to Fig. 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. The short side surface 13 is an example of "one end" in the present disclosure.

[0045] The upper surface 11 and the lower surface 12 are each a surface of the energy storage cell 10 facing in the Z direction. Specifically, the upper surface 11 is an end surface on the Z1 side of the energy storage cell 10. The lower surface 12 is an end surface on the Z2 side of the energy storage cell 10, and is a surface provided on the opposite side of the upper surface 11 in the Z direction.

[0046] Each of the short side surfaces 13 and 14 is a surface of the energy storage cell 10 facing in the X direction. Specifically, the short side surfaces 13 and 14 are one end surface of the energy storage cell 10 facing in the X direction and the other end surface of the energy storage cell 10 facing in the X direction, respectively.

[0047] Each of the long side surfaces 15 and 16 is a surface of the energy storage cell 10 facing in the Y direction. Specifically, the long side surfaces 15 and 16 are one end surface of the energy storage cell 10 facing in the Y direction and the other end surface of the energy storage cell 10 facing in the Y direction, respectively.

[0048] The energy storage cell 10 is formed to be elongated in the X direction. Specifically, the width W1 of the energy storage cell 10 in the X direction is larger than the width W2 of the energy storage cell 10 in the Y direction. The width W1 is also larger than the height H of the energy storage cell 10 in the Z direction. The height H is also larger than the width W2.

[0049] The energy 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. The negative electrode terminal 18 is provided on the short side surface 13.

[0050] The energy storage cell 10 further includes a cell smoke vent valve 19 that exhausts gas inside the energy storage cell 10. The cell smoke vent valve 19 is configured to exhaust gas (smoke) inside the energy storage cell 10 to the outside of the energy storage cell 10 when the internal pressure of the energy storage cell 10 increases. The cell smoke vent valve 19 is provided on a side surface of the energy storage cell 10. In the example shown in FIG. 4, the cell smoke vent valve 19 is provided on the short side surface 13 on which the negative electrode terminal 18 is provided. The cell smoke vent valve 19 may also be provided on the short side surface 14, the long side surface 15, or the long side surface 16. The cell smoke vent valve 19 is an example of an "exhaust section" in the present disclosure.

[0051] 5 is a plan view showing the energy storage device 1 with the upper cover 210 removed. The adhesive layer 300 is disposed on the energy storage module 100. Specifically, the adhesive layer 300 is disposed (applied) on the upper surface 11 of each of the plurality of energy storage cells 10. In this way, the adhesive layer 300 bonds the plurality of energy storage cells 10 and the upper cover 210 together.

[0052] Specifically, an adhesive layer 300 is provided for each of the spaces S1 to S4. The adhesive layer 300 is disposed (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 adhesive material to the upper surface 11 of each of the plurality of storage cells 10. 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 in the spaces S1 to S4 are separated from one another. The adhesive layer 300 is formed of, for example, a resin adhesive material.

[0053] Here, in conventional electricity storage devices, it is thought that the adhesive that bonds the electricity storage cells to the case may prevent smoke generated in the electricity storage cells from being discharged to the outside of the case.

[0054] 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) below the upper cover 210.

[0055] A smoke exhaust passage 310 is provided in each of the spaces S1 to S4. In each of the spaces S1 to S4, the smoke exhaust passage 310 is 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.

[0056] 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.

[0057] 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.

[0058] Each smoke exhaust passage 310 is disposed at a position in the Y direction that overlaps with the position (range) of the smoke exhaust valve 250. Furthermore, the smoke exhaust passage 310 is disposed in the center of each of the spaces S1 to S4 in the Y direction.

[0059] The above phrase "the smoke exhaust passage 310 extends from the partition wall 227" also includes the 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. Similar expressions used hereinafter will also be defined in the same manner.

[0060] In each of the spaces S1 to S4, the smoke exhaust passage 310 extends from the end of the adhesive layer 300 on the X1 side to the end on the X2 side.

[0061] The adhesive layer 300 in each of the spaces S1 to S4 has a smoke exhaust passage 320 formed therein that intersects with the smoke exhaust passage 310. The smoke exhaust passage 320 is formed by providing a cavity (a space not filled with adhesive) below the upper cover 210. Each smoke exhaust passage 320 is formed to extend in the Y direction. In each of the spaces S1 to S4, the smoke exhaust passage 310 and the smoke exhaust passage 320 are perpendicular to each other. The smoke exhaust passage 320 is an example of a "crossing smoke exhaust passage" in the present disclosure.

[0062] 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, smoke may move between the smoke exhaust passage 310 and the smoke exhaust passage 320.

[0063] The smoke exhaust passage 320 in the space S1 extends from the partition wall 223 toward the side wall 222a. Specifically, the smoke exhaust passage 320 in the space S1 extends from the partition wall 223 to the partition wall 224. The smoke exhaust passage 320 in the space S2 extends from the partition wall 226 toward the side wall 222a. Specifically, the smoke exhaust passage 320 in the space S2 extends from the partition wall 226 to the partition wall 224.

[0064] The smoke exhaust passage 320 in the space S3 extends from the partition wall 223 toward the side wall 222b. Specifically, the smoke exhaust passage 320 in the space S3 extends from the partition wall 223 to the partition wall 225. The smoke exhaust passage 320 in the space S4 extends from the partition wall 226 toward the side wall 222b. Specifically, the smoke exhaust passage 320 in the space S4 extends from the partition wall 226 to the partition wall 225.

[0065] This allows smoke accumulated near partition wall 223 and partition wall 226 to move toward side wall 222a or side wall 222b through smoke exhaust passage 320. In addition, smoke that has moved from smoke exhaust passage 320 to smoke exhaust passage 310 can be discharged outside case 200 through smoke exhaust valve 250.

[0066] Furthermore, the smoke exhaust passage 320 is provided in the center of each of the spaces S1 to S4 in the X direction. In each of the spaces S1 to S4, the smoke exhaust passage 320 extends from the Y1-side end of the adhesive layer 300 to the Y2-side end. Therefore, in each of the spaces S1 to S4, the adhesive layer 300 is divided into four by the smoke exhaust passages 310 and 320.

[0067] Fig. 6 is a cross-sectional view that schematically shows the floor panel 913 and the energy storage device 1. Fig. 6 shows the adhesive layer 300 and the plurality of energy storage cells 10 in the space S1 as viewed from the X2 side. Note that Fig. 6 shows the configuration corresponding to the space S1 as a representative, but the configurations corresponding to the spaces S2 to S4 are similar.

[0068] Referring to FIG. 6, in the energy storage device 1, energy storage cells 10 arranged with their short sides 13 facing the X2 side and energy storage cells 10 arranged with their short sides 14 facing the X2 side are arranged alternately along the Y direction.

[0069] As a result, the cell smoke exhaust valves 19 formed on the short side surfaces 13 are arranged in the Y direction. In addition, the positive electrode terminals 17 and negative electrode terminals 18 of the energy storage cells 10 adjacent to each other in the Y direction are arranged adjacent to each other.

[0070] 6, the upper surface 11 of the energy 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. Note that 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.

[0071] The smoke exhaust passage 310 has a width W11 in the Y direction. The width W11 is smaller than, for example, the width W2 (FIG. 4) of the energy storage cell 10 in the Y direction. The smoke exhaust passage 310 is formed so that the width W11 is constant at each position in the X direction. Note that the width W11 may be equal to or greater than the width W2.

[0072] The smoke exhaust passage 310 has a rectangular shape when viewed along the X direction. Note that 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.

[0073] The energy storage device 1 further includes a cooler 400 that cools the energy storage cells 10. The cooler 400 has a cooling surface 410 on which a plurality of energy storage cells 10 are arranged. The cooling surface 410 is an end surface of the cooler 400 on the Z1 side. The cooler 400 (cooling surface 410) is provided along the lower surface 12 of the energy storage cell 10. Note that while FIG. 6 shows an example in which no adhesive material (adhesive layer) is provided between the cooling surface 410 and the lower surface 12 of the energy storage cell 10, an adhesive material (adhesive layer) may be provided at this position.

[0074] 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.

[0075] The energy storage device 1 includes a plurality of inter-cell bus bars 600. The inter-cell bus bars 600 connect a positive electrode terminal 17 provided on one of two energy storage cells 10 adjacent to each other in the Y direction to a negative electrode terminal 18 provided on the other of the two energy storage cells 10.

[0076] Fig. 7 is a plan view of a plurality of energy storage cells 10 in space S1 as viewed from the Z1 side. For simplicity, the adhesive layer 300 is not shown in Fig. 7. Although Fig. 7 shows the configuration corresponding to space S1 as a representative, the configurations corresponding to spaces S2 to S4 are similar.

[0077] As shown in Fig. 7, the multiple energy storage cells 10 are arranged such that the multiple cell smoke vent valves 19 are arranged in the Y direction along the partition wall 227. Specifically, the cell smoke vent valves 19 of the multiple energy storage cells 10 whose short sides 13 face toward the partition wall 227 are arranged in the Y direction. This causes smoke to be exhausted toward the partition wall 227 from the multiple cell smoke vent valves 19 arranged along 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 is exhausted from the smoke vent valve 250 (Fig. 5).

[0078] Furthermore, the multiple cell smoke vent valves 19 are arranged in the Y direction along the side wall 222c opposite the partition wall 227. Specifically, the cell smoke vent valves 19 of the multiple energy storage cells 10 whose short sides 13 face the side wall 222c are arranged in the Y direction. This causes smoke to be exhausted toward the side wall 222c from the multiple cell smoke vent valves 19 arranged along the side wall 222c. At least a portion of the smoke exhausted toward the side wall 222c is exhausted from the smoke vent valve 250 (FIG. 5) provided on the side wall 222c.

[0079] Fig. 8 is a cross-sectional view that schematically shows the floor panel 913 and the energy storage device 1. Fig. 8 shows the adhesive layer 300 and the energy storage cell 10 in the space S1 as seen from the Y1 side. Note that Fig. 8 shows the configuration corresponding to the space S1 as a representative, but the configurations corresponding to the spaces S2 to S4 are similar.

[0080] 8, the upper surface 11 of the energy storage cell 10 is exposed at a position corresponding to the smoke exhaust passage 320. In other words, no adhesive layer is provided on the Z2 side of the smoke exhaust passage 320. Note that 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 320.

[0081] 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 is constant at each position in the Y direction. Note that the width W12 may be equal to the width W11 (FIG. 6) of the smoke exhaust passage 310, for example.

[0082] The smoke exhaust passage 320 has a rectangular shape when viewed along the Y direction. Note that 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.

[0083] 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 energy storage cells 10 to move to the smoke exhaust valve 250 through the smoke exhaust passage 310. As a result, it is possible to prevent the adhesive layer 300 from interfering with the flow of smoke within the case 200. This allows smoke within the case 200 to be easily exhausted.

[0084] In the above embodiment, an example was shown in which the smoke exhaust passage 310 and the smoke exhaust passage 320 were formed in the adhesive layer 300, but the present disclosure is not limited to this. The adhesive layer 300 may have smoke exhaust passages other than the smoke exhaust passage 310 and the smoke exhaust passage 320 formed therein.

[0085] 9, in addition to the smoke exhaust passage 310 and the smoke exhaust passage 320, the adhesive layer 300 is also formed with the smoke exhaust passage 330 and the smoke exhaust passage 340. The smoke exhaust passage 330 and the smoke exhaust passage 340 are provided in each of the spaces S1 to S4. The smoke exhaust passage 330 is provided on the Y1 side of the smoke exhaust passage 310. The smoke exhaust passage 340 is provided on the Y2 side of the smoke exhaust passage 310.

[0086] Each of the smoke exhaust passage 330 and the smoke exhaust passage 340 extends from the partition wall 227 to the smoke exhaust passage 310. Each of the smoke exhaust passage 330 and the smoke exhaust passage 340 intersects with (is connected to) the smoke exhaust passage 310. The intersection of each of the smoke exhaust passage 330 and the smoke exhaust passage 340 with the smoke exhaust passage 310 is located closer to the partition wall 227 than the smoke exhaust passage 320.

[0087] In the embodiment, an example has been shown in which the adhesive layer 300 is formed with the smoke exhaust passage 310 and the smoke exhaust passage 320, but the present disclosure is not limited to this. The adhesive layer 300 may be formed with only the smoke exhaust passage 310, without the smoke exhaust passage 320 being formed therein.

[0088] In the above embodiment, an example has been shown in which the smoke exhaust passage 310 extends from the partition wall 227 toward the smoke vent valve 250, but the present disclosure is not limited to this. The smoke exhaust passage may extend toward the smoke vent valve 250 from a position other than the partition wall 227 (for example, from the partition walls 224, 225, etc.). Furthermore, the smoke exhaust passage 310 does not have to extend to the end of the adhesive layer 300 on the partition wall 227 side. Furthermore, the smoke exhaust passage 310 does not have to extend to the end of the adhesive layer 300 on the smoke vent valve 250 side.

[0089] In the above embodiment, an example has been described in which the smoke vent valve 250 is provided on each of the side walls 222c and 222d of the lower case 220, but the present disclosure is not limited to this. The smoke vent valve 250 may also be provided on the side walls 222a and 222b of the lower case 220.

[0090] In the above embodiment, the smoke exhaust passage 310 extends in the X direction, but the present disclosure is not limited to this. The smoke exhaust passage 310 may extend in a direction intersecting both the X direction and the Y direction toward the smoke exhaust valve 250 when viewed from the Z1 side. The smoke exhaust passage 320 may also extend in a direction intersecting both the X direction and the Y direction when viewed from the Z1 side.

[0091] In the above embodiment, an example has been shown in which each of the spaces S1 to S4 is provided with one smoke exhaust passage 310 and one smoke exhaust passage 320, but the present disclosure is not limited to this. Each of the spaces S1 to S4 may be provided with a plurality of at least one of the smoke exhaust passages 310 and the smoke exhaust passages 320.

[0092] 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 to this. 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).

[0093] In the above embodiment, an example has been described in which the cooler 400 is provided below the energy storage cells 10, but the present disclosure is not limited to this. The cooler may be provided above the energy storage cells. In this case, the adhesive material in which the smoke exhaust passage is formed may bond the lower surface 12 of the energy storage cells 10 and the lower case 220.

[0094] In the above embodiment, an example has been shown in which the plurality of energy storage cells 10 are arranged in the Y direction perpendicular to (intersecting with) the Z direction (vertical direction), but the present disclosure is not limited to this. For example, the plurality of energy storage cells 10 may be arranged (stacked) in the Z direction.

[0095] In the above embodiment, an example has been shown in which the spaces (S1 to S4) in which the plurality of storage cells 10 are arranged are partitioned from one another, but the present disclosure is not limited to this. For example, the spaces in which the storage cells 10 are arranged do not have to be partitioned. That is, only one space in which the plurality of storage cells 10 are arranged may be formed.

[0096] In the above embodiment, an example has been 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 may also be provided in an electrical device other than a vehicle (for example, a stationary power storage device).

[0097] In the above embodiment, an example has been shown in which the adhesive layer 300 is formed by applying a gel adhesive material to the energy storage cells 10, but the present disclosure is not limited to this. For example, the adhesive layer may be formed by arranging a sheet-like adhesive member so as to span the upper surfaces 11 of the plurality of energy storage cells 10.

[0098] In the above embodiment, the smoke exhaust passage 310 is formed so that the width W11 is constant at each position in the X direction, but 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).

[0099] In the above embodiment, the smoke exhaust passage 310 and the smoke exhaust passage 320 intersect (the smoke exhaust passages are connected to each other), but the present disclosure is not limited to this. For example, the position in the Z direction of the smoke exhaust passage extending in the X direction and the position in the Z direction of the smoke exhaust passage extending in the Y direction may be offset, so that the two smoke exhaust passages do not have to be connected to each other.

[0100] 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 above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0101] 1 Energy storage device, 10 Energy storage cell, 13 Short side surface (one end), 19 Cell exhaust valve (exhaust portion), 100 Energy storage module, 200 Case, 210 Upper cover (covering portion), 222 Peripheral wall portion, 222c, 222d Side wall (first side wall), 223 Partition wall (partition portion) (second partition wall), 226 Partition wall (partition portion) (second partition wall), 227 Partition wall (partition portion) (first partition wall), 250 Smoke exhaust valve, 300 Adhesive layer (adhesive member), 310 Smoke exhaust passage, 320 Smoke exhaust passage (cross smoke exhaust passage).

Claims

1. a power storage module including a plurality of power storage cells; a case that houses the power storage module; an adhesive member that adheres the plurality of storage cells to the case; a smoke exhaust valve provided in the case, The adhesive member has a smoke exhaust passage formed therein, the smoke exhaust passage extending toward the smoke exhaust valve.

2. The case is a covering portion provided to cover the plurality of storage cells from one side in a first direction and adhered to the plurality of storage cells by the adhesive member; a peripheral wall portion provided to surround the plurality of energy storage cells when viewed from the one side and on which the smoke exhaust valve is provided; a partition wall portion that divides a space within the case in which the plurality of storage cells are housed into a plurality of sections when viewed from the one side, The power storage device according to claim 1 , wherein 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. Each of the plurality of storage cells is formed to be elongated in a second direction when viewed from the one side, an exhaust portion is formed at one end in the second direction of each of the plurality of storage cells, the plurality of storage cells are arranged in a third direction intersecting the second direction when viewed from the one side, the partition wall portion includes a first partition wall extending in the third direction, The power storage device according to claim 2 , wherein the plurality of power storage cells are arranged such that the plurality of exhaust portions are aligned in the third direction along the first partition wall.

4. the peripheral wall portion includes a first side wall extending in the third direction, The smoke exhaust valve is provided on the first side wall, The power storage device according to claim 3 , wherein 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 partition wall portion includes a second partition wall extending in the second direction, The power storage device according to claim 3 , wherein the adhesive member has a crossing smoke exhaust passage formed therein, the crossing smoke exhaust passage extending from the second partition wall toward the peripheral wall portion and crossing the smoke exhaust passage.

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