Power storage stack

Abstract

To provide a power storage stack capable of suppressing variation in a temperature.SOLUTION: A power storage stack 20 comprises: a plurality of power storage modules 21 that is arranged to a first direction; and a conductive member 28 that is arranged to between the adjacent power storage modules 21. The conductive member 28 includes: a first surface 28a; and a second surface 28b. The first surface 28a is fixed by a first conductive adhesive agent 71 to each power storage module 21 positioned to one side of the first direction. The second surface 28b is fixed by a second conductive adhesive agent 72 to each power storage module 21 positioned to the other side of the first direction. The first conductive adhesive agent 71 contains a plurality of first coating steps 711 that is arranged in parallel with an interval to a second direction. The second conductive adhesive agent contains a plurality of second coating parts 721 that is arranged in parallel with an interval to a second direction. In view of the first direction, the plurality of first coating parts 711 and the plurality of second coating parts 721 are arranged without being overlapped each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an energy storage stack.

Background Art

[0002] As a conventional energy storage stack, Japanese Unexamined Patent Application Publication No. 2021-86661 (Patent Document 1) discloses a configuration in which a unit in which a first current collector plate, a heat exchanger, and a second current collector plate are laminated in this order is disposed between a first energy storage module and a second energy storage module. The first current collector plate is fixed to the main surface of the heat exchanger located on one side in the stacking direction by a first adhesive, and the second current collector plate is fixed to the main surface of the heat exchanger located on the other side in the stacking direction by a second adhesive. The heat exchanger exchanges heat with the first energy storage module via the first current collector plate and exchanges heat with the second energy storage module via the second current collector plate. By positioning the heat exchanger, the first current collector plate, and the second current collector plate with the first adhesive and the second adhesive, it is possible to suppress the positions of the heat exchanger, the first current collector plate, and the second current collector plate from shifting relative to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an energy storage stack, when a conductive member is disposed between adjacent energy storage modules and the conductive member and the adjacent energy storage modules are partially fixed with a conductive adhesive, depending on the application position of the conductive adhesive, there is a concern that temperature variations may occur when the energy storage modules generate heat due to energization or the like.

[0005] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide an energy storage stack capable of suppressing temperature variations.

Means for Solving the Problems

[0006] The energy storage stack according to the present disclosure includes a plurality of energy storage modules arranged in a first direction and a conductive member disposed between each of the energy storage modules adjacent to each other in the first direction. The conductive member has a first surface located on one side in the first direction and a second surface located on the other side in the first direction. The first surface is fixed to the energy storage module located on one side in the first direction with respect to the conductive member by a first conductive adhesive. The second surface is fixed to the energy storage module located on the other side in the first direction with respect to the conductive member by a second conductive adhesive. The first conductive adhesive includes at least a part thereof a plurality of first coating portions arranged side by side at intervals in a second direction orthogonal to the first direction. The second conductive adhesive includes at least a part thereof a plurality of second coating portions arranged side by side at intervals in the second direction. When viewed from the first direction, the plurality of first coating portions and the plurality of second coating portions are arranged so as not to overlap each other.

[0007] In the energy storage stack according to the present disclosure, the first conductive adhesive may have a first connection portion that connects the first coating portions adjacent to each other in the second direction. The second conductive adhesive may have a second connection portion that connects the second coating portions adjacent to each other in the second direction. When viewed from the first direction, at least a part of the first connection portion and the second connection portion may overlap each other.

[0008] In the energy storage stack according to the present disclosure, in at least one of the plurality of first coating portions and the plurality of second coating portions, the electrical conductivity of the coating portions disposed on both end sides in the second direction may be greater than the electrical conductivity of the coating portions disposed on the central side in the second direction.

[0009] The power storage stack based on the present disclosure may further include a first current collector plate and a second current collector plate arranged so as to sandwich the plurality of power storage modules and the conductive members disposed between each of the power storage modules adjacent to each other in the first direction in the first direction. Each of the plurality of power storage modules has a first main surface located on one side in the first direction and a second main surface located on the other side in the first direction. In this case, the first main surface of the power storage module located on the outermost side in the first direction among the plurality of power storage modules may be fixed to the first current collector plate by a third conductive adhesive, and the second main surface of the power storage module located on the outermost side in the other direction in the first direction among the plurality of power storage modules may be fixed to the second current collector plate by a fourth conductive adhesive. Further, the third conductive adhesive may include, at least in part, a plurality of third coated portions arranged side by side at intervals in the second direction, and the fourth conductive adhesive may include, at least in part, a plurality of fourth coated portions arranged side by side at intervals in the second direction. In at least one of the plurality of third coated portions and the plurality of fourth coated portions, the electrical conductivity of the coated portions arranged on both end sides in the second direction may be greater than the electrical conductivity of the coated portions arranged on the central side in the second direction.

[0010] In the power storage stack based on the present disclosure, in at least one of the plurality of third coated portions and the plurality of fourth coated portions, the interval in the second direction of the coated portions arranged on both end sides in the second direction may be smaller than the interval in the second direction of the coated portions arranged in the central portion in the second direction.

[0011] In the power storage stack based on the present disclosure, in at least one of the plurality of third coated portions and the plurality of fourth coated portions, the content of the metal fine particles contained in the coated portions arranged on both end sides in the second direction may be greater than the content of the metal fine particles contained in the coated portions arranged in the central portion in the second direction.

Advantages of the Invention

[0012] According to the present disclosure, a power storage stack capable of suppressing temperature variations can be provided.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0015] (Embodiment 1) FIG. 1 is an exploded perspective view of a power storage device according to Embodiment 1. FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 1. With reference to FIGS. 1 and 2, the power storage device 100 according to Embodiment 1 will be described.

[0016] The power storage device 100 is mounted on a vehicle such as a hybrid vehicle capable of traveling using the power of at least one of a motor and an engine, or an electric vehicle traveling with a driving force obtained from electric energy.

[0017] The power storage device 100 includes a housing case 10, a power storage stack 20, and a plurality of stoppers 50, 60.

[0018] The power storage stack 20 includes a plurality of power storage modules 21, a first current collector plate 23 and a second current collector plate 24, insulating sheets 25 and 26, a plurality of conductive members 28, a first conductive adhesive 71, a second conductive adhesive 72, a third conductive adhesive 73, and a fourth conductive adhesive 74.

[0019] The plurality of power storage modules 21 are arranged in a first direction (DR1 direction). The first direction is parallel to the vertical direction of the vehicle in the mounted state where the power storage device 100 is mounted on the vehicle.

[0020] The plurality of power storage modules 21 are, for example, so-called bipolar batteries. More specifically, the power storage module 21 is a laminated aqueous battery, which is a secondary battery such as a lithium-ion battery. Note that the power storage module 21 is not limited to the above, and may be composed of an all-solid-state battery, a capacitor, or the like. Each of the plurality of power storage modules 21 has a first main surface 21a located on one side in the first direction and a second main surface 21b located on the other side in the first direction.

[0021] The plurality of conductive members 28 include a plurality of coolers 22 and a conductive plate 27. The plurality of coolers 22 are arranged between adjacent power storage modules 21. The plurality of coolers 22 are provided with refrigerant flow paths through which refrigerant can flow. The cooler 22 cools the power storage module 21.

[0022] The conductive plate 27 is arranged between adjacent power storage modules 21. Specifically, the conductive plate 27 is arranged between adjacent power storage modules 21 between two coolers 22 facing each other in the first direction.

[0023] The conductive member 28 has a first surface 28a located on one side in the first direction and a second surface 28b located on the other side in the first direction.

[0024] The first surface 28a is fixed to the power storage module 21 located on one side in the first direction with respect to the conductive member 28 by a first conductive adhesive 71. More specifically, the first surface 28a is fixed to the second main surface 21b of the power storage module 21.

[0025] The second surface 28b is fixed to the power storage module 21 located on the other side in the first direction with respect to the conductive member 28 by a second conductive adhesive 72. More specifically, the second surface 28b is fixed to the first main surface 21a of the power storage module 21.

[0026] The first current collector plate 23 is laminated on one side in the first direction of the power storage module 21 located on the outermost side in the first direction. The first current collector plate 23 is fixed to the first main surface 21a of the power storage module 21 located on the outermost side in the first direction by a third conductive adhesive 73. The first current collector plate 23 is, for example, a current collector plate for a positive electrode. The first current collector plate 23 is connected to a positive electrode terminal (not shown).

[0027] The second current collector plate 24 is laminated on the other side in the first direction of the power storage module 21 located on the outermost side in the first direction. The second current collector plate 24 is fixed to the second main surface 21b of the power storage module 21 located on the outermost side in the first direction by a fourth conductive adhesive 74. The second current collector plate 24 is, for example, a current collector plate for a negative electrode. The second current collector plate 24 is connected to a negative electrode terminal (not shown). Charging and discharging of the power storage stack 20 are performed using the negative electrode terminal and the above-described positive electrode terminal.

[0028] An insulating sheet 25 is disposed on one side in the first direction of the first current collector plate 23. An insulating sheet 26 is disposed on the other side in the first direction of the second current collector plate 24.

[0029] The housing case 10 houses the power storage stack 20 and a plurality of stoppers 50, 60 therein. The housing case 10 includes a restraint plate 11 constituting a ceiling portion and a lower case 12.

[0030] The restraint plate 11 has a plate-like shape. The restraint plate 11 may be composed of a metal member such as SUS, for example. The restraint plate 11 is fastened and fixed to the side wall portion of the lower case 12 using a fastening member such as a bolt.

[0031] The restraint plate 11 has an outer main surface 11a located on the side opposite to the side where the power storage stack 20 is located. A plurality of reinforcing portions 30 are provided on the outer main surface 11a.

[0032] Each of the plurality of reinforcing portions 30 is provided so as to extend along a second direction (DR2 direction) orthogonal to the first direction. The plurality of reinforcing portions 30 extend, for example, from one end of the restraint plate 11 in the second direction to the other end of the restraint plate 11 in the second direction.

[0033] The plurality of reinforcing portions 30 are arranged side by side in a third direction (DR3 direction) orthogonal to the first direction and the second direction. The plurality of reinforcing portions 30 may be welded to the restraint plate 11 by welding or the like, or may be fixed to the restraint plate 11 by a fastening member. The plurality of reinforcing portions 30 may be composed of a metal member such as SUS.

[0034] The lower case 12 has a substantially box-shaped shape that opens toward one side in the first direction. The lower case 12 may be composed of a metal member such as SUS, for example. The lower case 12 includes a restraint plate 13 as a bottom portion and a plurality of side wall portions 14 to 17.

[0035] The restraint plate 13 has a plate-like shape similar to the restraint plate 11. The restraint plate 13 faces the restraint plate 11 in the first direction. The power storage stack 20 is restrained by sandwiching the power storage stack 20 between the restraint plate 11 and the restraint plate 13.

[0036] The restraint plate 13 has an outer main surface 13a located on the side opposite to the side where the power storage stack 20 is located. A plurality of reinforcing portions 40 are provided on the outer main surface 13a.

[0037] Each of the plurality of reinforcing parts 40 is provided so as to extend along the second direction. The plurality of reinforcing parts 40 may be welded to the restraint plate 13 by welding or the like, or may be fixed to the restraint plate 11 by fastening members. The plurality of reinforcing parts 40 have substantially the same configuration as the plurality of reinforcing parts 30. The plurality of reinforcing parts 40 are provided at positions corresponding to the plurality of reinforcing parts 30. The plurality of reinforcing parts 40 are provided at positions facing the plurality of reinforcing parts 30 in the first direction.

[0038] The plurality of stoppers 50 and 60 are arranged on both outer sides of the power storage stack 20 in the second direction.

[0039] Specifically, the plurality of stoppers 60 are arranged between the power storage stack 20 and the side wall portion 14 on one side in the second direction. The plurality of stoppers 60 are arranged side by side at intervals in the third direction.

[0040] The plurality of stoppers 60 are arranged at positions overlapping the corresponding reinforcing parts 30 and 40 in the first direction on the first end portions 30c and 40c sides in the second direction of the corresponding reinforcing parts among the plurality of reinforcing parts 30 and 40. Each of the plurality of stoppers 60 is fixed to the corresponding reinforcing parts 30 and 40 by a fastening member 70, for example.

[0041] The plurality of stoppers 50 are arranged between the power storage stack 20 and the side wall portion 15 on the other side in the second direction. The plurality of stoppers 50 are arranged side by side at intervals in the third direction.

[0042] The plurality of stoppers 50 are arranged at positions overlapping the corresponding reinforcing parts 30 and 40 in the first direction on the second end portions 30d and 40d sides in the second direction of the corresponding reinforcing parts among the plurality of reinforcing parts 30 and 40. Each of the plurality of stoppers 50 is fixed to the corresponding reinforcing parts 30 and 40 by a fastening member 70, for example.

[0043] Each of the plurality of stoppers 50, 60 has inner surfaces 50c, 60c facing the power storage stack 20. Heat insulating members 51, 61 may be provided on the inner surfaces 50c, 60c. Thereby, even when the stoppers 50, 60 are cooled, it is possible to suppress the occurrence of condensation on the power storage stack 20 side.

[0044] Note that the fixing modes of the plurality of stoppers 50, 60 are not limited to fastening and fixing, and can be appropriately selected such as adhesive fixing and welding fixing.

[0045] FIG. 3 is a schematic plan view showing the shapes and positional relationships of the first conductive adhesive and the second conductive adhesive in the power storage device according to Embodiment 1. With reference to FIG. 3, details of the first conductive adhesive 71 and the second conductive adhesive 72 will be described.

[0046] The first conductive adhesive 71 and the second conductive adhesive 72 are obtained by mixing metal particles into a resin adhesive. For example, the first conductive adhesive 71 and the second conductive adhesive 72 are obtained by mixing metal fillers such as nickel into an epoxy resin. The above-described third conductive adhesive 73 and fourth conductive adhesive 74 are the same as the first conductive adhesive 71 and the second conductive adhesive 72.

[0047] The first conductive adhesive 71 includes a plurality of first coating portions 711 arranged side by side at intervals in the second direction. Similarly, the second conductive adhesive 72 includes a plurality of second coating portions 721 arranged side by side at intervals in the second direction.

[0048] By providing the first conductive adhesive 71 and the second conductive adhesive 72 in this way, the area of the adhesive can be reduced as compared with the case where the adhesive is applied to the entire first surface 28a and the second surface 28b of the conductive member 28. Thereby, the manufacturing cost can be reduced.

[0049] The ratio of the coating area of the first conductive adhesive 71 to the area of the first surface 28a is, for example, 5% or more and 20% or less, and more specifically, 7% or more and 12% or less. The ratio of the coating area of the first conductive adhesive 71 to the area of the first surface 28a may be, for example, about 10%.

[0050] Similarly, the ratio of the coating area of the second conductive adhesive 72 to the area of the second surface 28b is, for example, 5% or more and 20% or less, and more specifically, 7% or more and 12% or less. The ratio of the coating area of the second conductive adhesive 72 to the area of the second surface 28b may be, for example, about 10%.

[0051] In this embodiment, the electrical conductivities of the plurality of first coating portions 711 are substantially the same, and the electrical conductivities of the plurality of second coating portions 721 are substantially the same. Also, the electrical conductivities of the first coating portion 711 and the second coating portion 721 are substantially the same.

[0052] Generally, since the conductive adhesive has an electrical resistance, the temperature rises due to Joule heating during energization. When the plurality of first coating portions 711 and the plurality of second coating portions 721 are arranged so as to face each other on the first surface 28a side and the second surface 28b side of the conductive member 28, the temperature of the region where the first coating portion 711 and the second coating portion 721 face each other rises. For this reason, there is a concern that temperature variations may occur in the conductive member between the region where the first coating portion 711 and the second coating portion 721 are applied to face each other and the region where the first coating portion 711 and the second coating portion 721 are not applied. As a result, temperature variations may also occur in the power storage module.

[0053] Here, in the present embodiment, when viewed from the first direction, the plurality of first coating portions 711 and the plurality of second coating portions 721 are arranged so as not to overlap each other. More specifically, when viewed from the first direction, the first coating portion 711 and the second coating portion 721 are arranged to alternate in the second direction. In this way, by arranging the plurality of first coating portions 711 and the plurality of second coating portions 721, it is possible to suppress the occurrence of temperature variations in the conductive member 28. As a result, it is possible to suppress the temperature variations in the power storage module 21, and thus also suppress the temperature variations in the power storage stack 20. In particular, during high-load running or rapid charging, the temperature variations in the power storage stack 20 can be effectively suppressed.

[0054] As shown in FIG. 2 again, the third conductive adhesive 73 includes a plurality of third coating portions 731 arranged side by side at intervals in the second direction. Similarly, the fourth conductive adhesive 74 includes a plurality of fourth coating portions 741 arranged side by side at intervals in the second direction.

[0055] Also, in the relationship between the plurality of third coating portions 731 located on the first main surface 21a of the power storage module 21 located on one side in the first direction and the plurality of first coating portions 711 located on the second main surface 21b of the power storage module 21, when viewed from the first direction, the plurality of third coating portions 731 and the plurality of first coating portions 711 are arranged so as not to overlap each other. Also in this case, when viewed from the first direction, the plurality of third coating portions 731 and the plurality of first coating portions 711 are arranged to alternate in the second direction.

[0056] Also, in the relationship between the plurality of second coating portions 721 located on the first main surface 21a of the power storage module 21 located on the other side in the first direction and the plurality of fourth coating portions 741 located on the second main surface 21b of the power storage module 21, when viewed from the first direction, the plurality of second coating portions 721 and the plurality of fourth coating portions 741 are arranged so as not to overlap each other. Also in this case, when viewed from the first direction, the plurality of second coating portions 721 and the plurality of fourth coating portions 741 are arranged to alternate in the second direction.

[0057] By configuring in this way as well, the temperature variation of the power storage stack 20 can be reduced.

[0058] (Embodiment 2) FIG. 4 is a schematic cross-sectional view of a power storage device according to Embodiment 2. With reference to FIG. 4, the power storage device 100A according to Embodiment 2 will be described. Note that FIG. 4 is a cross-sectional view facing the schematic cross-sectional view along line II-II shown in FIG. 1.

[0059] As shown in FIG. 4, when the power storage device 100A according to Embodiment 2 is compared with the power storage device 100 according to Embodiment 1, the arrangements of the third conductive adhesive 73 and the fourth conductive adhesive 74 are different. For other configurations, they are substantially the same.

[0060] In the third conductive adhesive 73, the electrical conductivity of the third coating portions 731 arranged on both end sides in the second direction is greater than the electrical conductivity of the third coating portions 731 arranged on the central side in the second direction.

[0061] Specifically, for example, the interval in the second direction of the third coating portions 731 arranged on both end sides in the second direction is smaller than the interval in the second direction of the third coating portions 731 arranged in the central portion in the second direction.

[0062] Similarly, in the fourth conductive adhesive 74, the electrical conductivity of the fourth coating portions 741 arranged on both end sides in the second direction is greater than the electrical conductivity of the fourth coating portions 741 arranged on the central side in the second direction.

[0063] Specifically, for example, the interval in the second direction of the fourth coating portions 741 arranged on both end sides in the second direction is smaller than the interval in the second direction of the fourth coating portions 741 arranged in the central portion in the second direction.

[0064] Generally, in the power storage stack 20, the peripheral edge portions of the current collectors arranged on both end sides in the stacking direction (the first direction) tend to have a large heat dissipation to the accommodation space. Therefore, by increasing the electrical conductivity of the third coating portion 731 and the fourth coating portion 741 arranged in the region where the heat dissipation is large, it is possible to reduce the temperature variation caused by the heat dissipation.

[0065] In the above description, an example is given in which the electrical conductivity of the coating portions arranged on both end sides in the second direction is larger than the electrical conductivity of the coating portions arranged in the central portion in the second direction in both the third conductive adhesive 73 and the fourth conductive adhesive 74, but the present invention is not limited thereto. It is sufficient that the above relationship of the electrical conductivity is established in at least one of the third conductive adhesive 73 and the fourth conductive adhesive 74.

[0066] Also, in the above description, as an example of adjusting the electrical conductivity, the case of adjusting the interval between the coating portions is exemplified, but the present invention is not limited thereto. The content rate of the metal fine particles contained in the coating portions arranged on both end sides in the second direction may be larger than the content rate of the metal fine particles contained in the coating portions arranged in the central portion in the second direction. In this case, the intervals between the plurality of coating portions may be constant.

[0067] (Embodiment 3) FIG. 5 is a schematic plan view showing the shapes and positional relationships of the first conductive adhesive and the second conductive adhesive in the power storage device according to Embodiment 3. With reference to FIG. 5, the power storage device according to Embodiment 3 will be described.

[0068] As shown in FIG. 5, the power storage device according to Embodiment 3 has different shapes of the first conductive adhesive 71 and the second conductive adhesive 72 as compared with the power storage device 100 according to Embodiment 1. The other configurations are substantially the same.

[0069] The first conductive adhesive 71 includes a plurality of first coating portions 711 and a plurality of first connection portions 712. The plurality of first connection portions 712 connect the first coating portions 711 that are alternately adjacent to each other on one side and the other side in the third direction.

[0070] The second conductive adhesive 72 includes a plurality of second coating portions 721 and a plurality of second connection portions 722. The plurality of second connection portions 722 connect the second coating portions 721 that are alternately adjacent to each other on one side and the other side in the third direction.

[0071] Even in such a configuration, the power storage device according to Embodiment 3 can obtain substantially the same effects as the power storage device 100 according to Embodiment 1.

[0072] (Other Modifications) In the above-described Embodiment 1, each of the plurality of first coating portions 711 and the plurality of second coating portions 721 is exemplified as having substantially the same electrical conductivity, but it is not limited thereto. In at least one of the plurality of first coating portions 711 and the plurality of second coating portions 721, the electrical conductivity of the coating portions arranged on both end sides in the second direction may be greater than the electrical conductivity of the coating portions arranged on the central side in the second direction.

[0073] Generally, in the power storage module 21, the current density tends to be smaller in the direction of the end portion than in the central portion. By adjusting the electrical conductivity of the coating portion as described above, it is possible to reduce the temperature variation caused by the current density distribution.

[0074] Specifically, as the adjustment of the electrical conductivity, for example, the interval in the second direction of the coating portions arranged on both end sides in the second direction may be made smaller than the interval in the second direction of the coating portions arranged in the central portion in the second direction. Alternatively, the content rate of the metal fine particles contained in the coating portions arranged on both end sides in the second direction may be made larger than the content rate of the metal fine particles contained in the coating portions arranged in the central portion in the second direction.

[0075] The embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, and all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0076] 10 housing case, 11 restraint plate, 11a outer main surface, 12 lower case, 13 restraint plate, 13a outer main surface, 14, 15, 16, 17 side wall portions, 20 power storage stack, 21 power storage module, 21a first main surface, 21b second main surface, 22 cooler, 23 first current collector plate, 24 second current collector plate, 25, 26 insulating sheets, 27 conductive plate, 28 conductive member, 28a first surface, 28b second surface, 30, 40 reinforcing portions, 30c, 40c first end portions, 30d, 40d second end portions, 50, 60 stoppers, 50c, 60c inner surfaces, 51, 61 heat insulating members, 70 fastening member, 71 first conductive adhesive, 72 second conductive adhesive, 73 third conductive adhesive, 74 fourth conductive adhesive, 100, 100A power storage device, 711 first coating portion, 712 first connection portion, 721 second coating portion, 722 second connection portion, 731 third coating portion, 741 fourth coating portion.

Claims

1. A plurality of power storage modules arranged in a first direction, and a conductive member disposed between each of the power storage modules adjacent to each other in the first direction, wherein the conductive member has a first surface located on one side in the first direction and a second surface located on the other side in the first direction, the first surface is fixed to a power storage module located on one side in the first direction with respect to the conductive member by a first conductive adhesive, the second surface is fixed to a power storage module located on the other side in the first direction with respect to the conductive member by a second conductive adhesive, the first conductive adhesive includes at least a part thereof a plurality of first coating portions arranged side by side at intervals in a second direction orthogonal to the first direction, the second conductive adhesive includes at least a part thereof a plurality of second coating portions arranged side by side at intervals in the second direction, a power storage stack, wherein when viewed from the first direction, the plurality of first coating portions and the plurality of second coating portions are arranged so as not to overlap each other.

2. the first conductive adhesive has a first connecting portion connecting the first coating portions adjacent to each other in the second direction, the second conductive adhesive has a second connecting portion connecting the second coating portions adjacent to each other in the second direction, the power storage stack according to claim 1, wherein at least a part of the first connecting portion and the second connecting portion overlap when viewed from the first direction.

3. In at least one of the plurality of first coating portions and the plurality of second coating portions, the electrical conductivity of the coating portions arranged at both ends in the second direction is greater than the electrical conductivity of the coating portions arranged at the center in the second direction, the power storage stack according to claim 1.

4. further comprising a first current collector plate and a second current collector plate arranged so as to sandwich the plurality of power storage modules and the conductive member disposed between each of the power storage modules adjacent to each other in the first direction in the first direction, each of the plurality of power storage modules has a first main surface located on one side in the first direction and a second main surface located on the other side in the first direction, the first main surface of the power storage module located on the outermost side in the first direction among the plurality of power storage modules is fixed to the first current collector plate by a third conductive adhesive, Of the plurality of power storage modules, the second main surface of the power storage module located on the other side in the first direction is fixed to the second current collector plate by a fourth conductive adhesive. The third conductive adhesive includes, at least in part, a plurality of third coating portions arranged side by side with a space therebetween in the second direction. The fourth conductive adhesive includes, at least in part, a plurality of fourth coating portions arranged side by side with a space therebetween in the second direction. In at least one of the plurality of third coating portions and the plurality of fourth coating portions, the electrical conductivity of the coating portions arranged on both end sides in the second direction is greater than the electrical conductivity of the coating portions arranged on the central side in the second direction. The power storage stack according to any one of claims 1 to 3.

5. In at least one of the plurality of third coating portions and the plurality of fourth coating portions, the interval in the second direction of the coating portions arranged on both end sides in the second direction is smaller than the interval in the second direction of the coating portions arranged in the central portion in the second direction. The power storage stack according to claim 4.

6. In at least one of the plurality of third coating portions and the plurality of fourth coating portions, the content of the metal fine particles contained in the coating portions arranged on both end sides in the second direction is greater than the content of the metal fine particles contained in the coating portions arranged in the central portion in the second direction. The power storage stack according to claim 4.

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