Power storage stack

Abstract

The invention relates to a power storage stack. A power storage stack is provided with: a plurality of power storage modules arranged in a first direction; and a conductive member disposed between the power storage modules adjacent to each other. The conductive member has a first surface and a second surface. The first surface is fixed to the power storage module positioned on one side in the first direction by a first conductive adhesive, and the second surface is fixed to the power storage module positioned on the other side in the first direction by a second conductive adhesive. The first conductive adhesive includes a plurality of first coating portions arranged at intervals in the second direction, and the second conductive adhesive includes a plurality of second coating portions arranged at intervals in the second direction. The plurality of first coating portions and the plurality of second coating portions are disposed so as not to overlap each other when viewed from the first direction.

Description

Technical Field

[0001] The present disclosure relates to an electricity storage stack. Background Art

[0002] As a conventional electricity storage stack, the following configuration is disclosed in Japanese Unexamined Patent Application Publication No. 2021-86661: 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 electricity storage module and a second electricity storage module. The first current collector plate is fixed to the main surface of the heat exchanger 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 on the other side in the stacking direction by a second adhesive. The heat exchanger exchanges heat with the first electricity storage module via the first current collector plate and exchanges heat with the second electricity storage module via the second current collector plate. The heat exchanger, the first current collector plate, and the second current collector plate are positioned by the first adhesive and the second adhesive, whereby it is possible to suppress the displacement of the positions of the heat exchanger, the first current collector plate, and the second current collector plate relative to each other. Summary of the Invention

[0003] In an electricity storage stack, a conductive member is sometimes disposed between adjacent electricity storage modules, and the conductive member and the adjacent electricity storage modules are locally fixed by a conductive adhesive. In this case, depending on the coating position of the conductive adhesive, when the electricity storage module generates heat due to energization or the like, a temperature deviation (non-uniformity) may occur.

[0004] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide an electricity storage stack capable of suppressing temperature deviation.

[0005] The electricity storage stack according to the present disclosure includes:

[0006] a plurality of electricity storage modules arranged in a first direction; and

[0007] a conductive member disposed between the electricity storage modules adjacent to each other in the first direction.

[0008] The conductive member has a first surface on one side in the first direction and a second surface on the other side in the first direction.

[0009] The first surface is fixed to the electricity storage module on the side in the first direction with respect to the conductive member by a first conductive adhesive.

[0010] The second surface is fixed to the electricity storage module on the other side in the first direction with respect to the conductive member by a second conductive adhesive.

[0011] The first conductive adhesive includes at least a part thereof a plurality of first coating portions arranged at intervals in a second direction orthogonal to the first direction.

[0012] The above-described second conductive adhesive includes at least a part thereof a plurality of second coating portions arranged at intervals in the above-described second direction.

[0013] The above-described plurality of first coating portions and the above-described plurality of second coating portions are arranged so as not to overlap each other when viewed from the above-described first direction.

[0014] In the power storage stack based on the present disclosure,

[0015] The above-described first conductive adhesive may have a first connecting portion that connects the first coating portions adjacent to each other in the above-described second direction.

[0016] The above-described second conductive adhesive may have a second connecting portion that connects the second coating portions adjacent to each other in the above-described second direction.

[0017] When viewed from the above-described first direction, at least a part of the above-described first connecting portion and the above-described second connecting portion may overlap.

[0018] In the power storage stack based on the present disclosure,

[0019] In at least one of the above-described plurality of first coating portions and the above-described plurality of second coating portions, the conductivity of the coating portions arranged on both end sides in the above-described second direction may be greater than the conductivity of the coating portions arranged on the central side in the above-described second direction.

[0020] The power storage stack based on the present disclosure may further include a first current collector plate and a second current collector plate, and the first current collector plate and the second current collector plate are arranged such that the above-described plurality of power storage modules and the above-described conductive members disposed between the power storage modules adjacent to each other in the above-described first direction are sandwiched between the first current collector plate and the second current collector plate in the above-described first direction.

[0021] Each of the above-described plurality of power storage modules has a first main surface on one side in the above-described first direction and a second main surface on the other side in the above-described first direction.

[0022] In this case, the above-described first main surface of the power storage module located on the side closest to the above-described first direction among the above-described plurality of power storage modules may be fixed to the above-described first current collector plate by a third conductive adhesive,

[0023] The above-described second main surface of the power storage module located on the side closest to the other side in the above-described first direction among the above-described plurality of power storage modules may be fixed to the above-described second current collector plate by a fourth conductive adhesive.

[0024] Furthermore, at least a part of the above-described third conductive adhesive may include a plurality of third coating portions arranged at intervals in the above-described second direction.

[0025] At least a part of the above-described fourth conductive adhesive may include a plurality of fourth coating portions arranged at intervals in the above-described second direction.

[0026] In at least one of the above-described plurality of third coating portions and the above-described plurality of fourth coating portions, the conductivity of the coating portions disposed on both end sides in the above-described second direction may be greater than the conductivity of the coating portions disposed on the central side in the above-described second direction.

[0027] In the power storage stack based on the present disclosure, it may be that:

[0028] In at least one of the above-described plurality of third coating portions and the above-described plurality of fourth coating portions, the interval in the above-described second direction of the coating portions disposed on both end sides in the above-described second direction is smaller than the interval in the above-described second direction of the coating portions disposed on the central portion in the above-described second direction.

[0029] In the power storage stack based on the present disclosure, it may be that:

[0030] In at least one of the above-described plurality of third coating portions and the above-described plurality of fourth coating portions, the content ratio of the metal fine particles contained in the coating portions disposed on both end sides in the above-described second direction is greater than the content ratio of the metal fine particles contained in the coating portions disposed on the central portion in the above-described second direction.

[0031] According to the present disclosure, it is possible to provide a power storage stack capable of suppressing temperature deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Hereinafter, the features, advantages, and technical and industrial significance of the exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same elements, and:

[0033] Figure 1 is an exploded perspective view of the power storage device according to Embodiment 1;

[0034] Figure 2 is along Figure 1 a schematic cross-sectional view taken along line II-II shown;

[0035] Figure 3 is a schematic top view showing the shape and positional relationship of the first conductive adhesive and the second conductive adhesive in the power storage device according to Embodiment 1;

[0036] Figure 4 is a schematic cross-sectional view of the power storage device according to Embodiment 2;

[0037] Figure 5 This is a schematic top 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. Detailed Embodiment

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, in the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and their descriptions will not be repeated.

[0039] Embodiment 1

[0040] Figure 1 This is an exploded perspective view of the power storage device according to Embodiment 1. Figure 2 This is a schematic cross-sectional view taken along line II-II shown in Figure 1 . Referring to Figure 1 and Figure 2 , the power storage device 100 according to Embodiment 1 will be described.

[0041] The power storage device 100 is mounted on a vehicle such as a hybrid electric vehicle that can travel using the power of at least one of a motor and an engine, or an electrified vehicle that travels using the driving force obtained from electric energy.

[0042] The power storage device 100 includes a storage housing 10, a power storage stack 20, and a plurality of stoppers 50 and 60.

[0043] The power storage stack 20 includes a plurality of power storage modules 21, a first current collector plate 23, 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.

[0044] The plurality of power storage modules 21 are arranged in the first direction (DR1 direction). In addition, in the mounted state where the power storage device 100 is mounted on a vehicle, the first direction is parallel to the vertical direction of the vehicle.

[0045] 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. In addition, 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 on one side in the first direction and a second main surface 21b on the other side in the first direction.

[0046] The plurality of conductive members 28 include a plurality of coolers 22 and conductive plates 27. The plurality of coolers 22 are disposed between the power storage modules 21 adjacent to each other. A refrigerant flow path through which refrigerant can flow is provided in the plurality of coolers 22. The cooler 22 cools the power storage module 21.

[0047] The conductive plates 27 are disposed between the power storage modules 21 adjacent to each other. Specifically, the conductive plates 27 are disposed between the power storage modules 21 adjacent to each other between two coolers 22 opposed in the first direction.

[0048] The conductive member 28 has a first surface 28a on one side in the first direction and a second surface 28b on the other side in the first direction.

[0049] The first surface 28a is fixed to the power storage module 21 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.

[0050] The second surface 28b is fixed to the power storage module 21 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.

[0051] The first current collector plate 23 is laminated on one side in the first direction of the power storage module 21 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 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).

[0052] The second current collector plate 24 is laminated on the other side in the first direction of the power storage module 21 on the outermost side in the other direction of the first direction. The second current collector plate 24 is fixed to the second main surface 21b of the power storage module 21 on the outermost side in the other direction of 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.

[0053] 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.

[0054] The housing 10 houses the power storage stack 20 and a plurality of stoppers 50 and 60 therein. The housing 10 includes a restraint plate 11 forming a ceiling portion and a lower housing 12.

[0055] The restraint plate 11 has a plate-like shape. The restraint plate 11 can be constituted by a metal member such as SUS, for example. The restraint plate 11 is fixedly connected and fastened to the side wall portion of the lower housing 12 using fastening connection members such as bolts.

[0056] The restraint plate 11 has an outer main surface 11a 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.

[0057] Each of the plurality of reinforcing portions 30 is provided to extend along a second direction (DR2 direction) orthogonal to the first direction. The plurality of reinforcing portions 30 extend, for example, in a manner that reaches 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.

[0058] The plurality of reinforcing portions 30 are arranged and configured in a third direction (DR3 direction) orthogonal to the first direction and the second direction. The plurality of reinforcing portions 30 can be fixed to the restraint plate 11 either by welding or other fusing methods, or by fastening connection members. The plurality of reinforcing portions 30 can also be constituted by a metal member such as SUS.

[0059] The lower housing 12 has a substantially box-shaped shape with an opening on the side facing the first direction. The lower housing 12 can also be constituted by a metal member such as SUS, for example. The lower housing 12 includes a restraint plate 13 as the bottom and a plurality of side wall portions 14 to 17.

[0060] The restraint plate 13 has a plate-like shape similarly 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 being sandwiched between the restraint plate 11 and the restraint plate 13.

[0061] The restraint plate 13 has an outer main surface 13a 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.

[0062] Each of the plurality of reinforcing portions 40 is provided to extend along the second direction. The plurality of reinforcing portions 40 can be fixed to the restraint plate 13 either by welding or other fusing methods, or by fastening connection members to the restraint plate 11. The plurality of reinforcing portions 40 have substantially the same constitution as the plurality of reinforcing portions 30. The plurality of reinforcing portions 40 are provided at positions corresponding to the plurality of reinforcing portions 30. The plurality of reinforcing portions 40 are provided at positions facing the plurality of reinforcing portions 30 in the first direction.

[0063] A plurality of stoppers 50 and 60 are arranged on both outer sides of the power storage stack 20 in the second direction.

[0064] Specifically, a 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 and spaced apart in the third direction.

[0065] A plurality of stoppers 60 are arranged at positions overlapping with corresponding reinforcing portions 30, 40 in the first direction on the side of the first ends 30c, 40c in the second direction of the corresponding reinforcing portions among the plurality of reinforcing portions 30, 40. Each of the plurality of stoppers 60 is fixed to the corresponding reinforcing portion 30, 40 by a fastening connection member 70, for example.

[0066] A 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 at intervals in the third direction.

[0067] A plurality of stoppers 50 are arranged at positions overlapping with corresponding reinforcing portions 30, 40 in the first direction on the side of the second ends 30d, 40d in the second direction of the corresponding reinforcing portions among the plurality of reinforcing portions 30, 40. Each of the plurality of stoppers 50 is fixed to the corresponding reinforcing portion 30, 40 by a fastening connection member 70, for example.

[0068] Each of the plurality of stoppers 50, 60 has inner surfaces 50c, 60c facing the power storage stack 20 side. Heat insulating members 51, 61 may be provided on the inner surfaces 50c, 60c. Thereby, even when the stoppers 50, 60 are cooled, condensation on the power storage stack 20 side can be suppressed.

[0069] In addition, the fixing method of the plurality of stoppers 50, 60 is not limited to fastening connection fixing, and adhesive fixing, welding fixing, etc. can be appropriately selected.

[0070] Figure 3 It 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. Refer to Figure 3 , details of the first conductive adhesive 71 and the second conductive adhesive 72 will be described.

[0071] The first conductive adhesive 71 and the second conductive adhesive 72 are formed by mixing metal particles into a resin adhesive. For example, the first conductive adhesive 71 and the second conductive adhesive 72 are formed by mixing metal fillers such as nickel into an epoxy resin. The above-mentioned third conductive adhesive 73 and fourth conductive adhesive 74 are the same as the first conductive adhesive 71 and the second conductive adhesive 72.

[0072] The first conductive adhesive 71 includes a plurality of first coating portions 711 arranged at intervals in the second direction. Similarly, the second conductive adhesive 72 includes a plurality of second coating portions 721 arranged at intervals in the second direction.

[0073] By setting the first conductive adhesive 71 and the second conductive adhesive 72 in this way, the area of the adhesive can be reduced compared with the case where the adhesive is coated on the entire surfaces of the first surface 28a and the second surface 28b of the conductive member 28. Thereby, the manufacturing cost can be reduced.

[0074] 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 can be, for example, about 10%.

[0075] 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 can be, for example, about 10%.

[0076] In addition, in the present embodiment, the conductivity of the plurality of first coating portions 711 is substantially the same, and the conductivity of the plurality of second coating portions 721 is substantially the same. Further, the conductivity of the first coating portion 711 and the second coating portion 721 is substantially the same.

[0077] Generally, since the conductive adhesive has resistance, its temperature rises due to Joule heating when an electric current is applied. When the plurality of first coating portions 711 and the plurality of second coating portions 721 are arranged 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 faces the second coating portion 721 rises. Therefore, a temperature deviation may occur in the conductive member between the region coated with the first coating portion 711 and the second coating portion 721 facing each other and the region where the first coating portion 711 and the second coating portion 721 are not coated. Thereby, a temperature deviation also occurs in the power storage module.

[0078] Here, in the present embodiment, the plurality of first coating portions 711 and the plurality of second coating portions 721 are arranged so as not to overlap each other when viewed from the first direction. More specifically, the first coating portion 711 and the second coating portion 721 are arranged to be alternately arranged in the second direction when viewed from the first direction. In this way, by arranging the plurality of first coating portions 711 and the plurality of second coating portions 721, a temperature deviation in the conductive member 28 can be suppressed. As a result, a temperature deviation of the power storage module 21 can be suppressed, and further a temperature deviation of the power storage stack 20 can be suppressed. In particular, a temperature deviation of the power storage stack 20 can be effectively suppressed during high-load driving and rapid charging.

[0079] Again, as Figure 2As shown, the third conductive adhesive 73 includes a plurality of third coating portions 731 arranged at intervals in the second direction. Similarly, the fourth conductive adhesive 74 includes a plurality of fourth coating portions 741 arranged at intervals in the second direction.

[0080] The plurality of third coating portions 731 located on the first main surface 21a of the power storage module 21 on the side closest to the first direction and the plurality of first coating portions 711 located on the second main surface 21b of the power storage module 21 are configured not to overlap each other when viewed from the first direction. In this case, the plurality of third coating portions 731 and the plurality of first coating portions 711 are also configured to be alternately arranged in the second direction when viewed from the first direction.

[0081] The plurality of second coating portions 721 located on the first main surface 21a of the power storage module 21 on the other side closest to the first direction and the plurality of fourth coating portions 741 located on the second main surface 21b of the power storage module 21 are configured not to overlap each other when viewed from the first direction. In this case, the plurality of second coating portions 721 and the plurality of fourth coating portions 741 are also configured to be alternately arranged in the second direction when viewed from the first direction.

[0082] By configuring in this way, it is also possible to reduce the temperature deviation of the power storage stack 20.

[0083] Embodiment 2

[0084] Figure 4 is a schematic cross-sectional view of the power storage device according to Embodiment 2. Refer to Figure 4 , the power storage device 100A according to Embodiment 2 will be described. In addition, Figure 4 is a cross-sectional view opposite to the schematic cross-sectional view along the line II-II shown in Figure 1 .

[0085] As Figure 4 shown, in the case where 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. Other configurations are substantially the same.

[0086] In the third conductive adhesive 73, the conductivity of the third coating portions 731 arranged on both end sides in the second direction is greater than the conductivity of the third coating portions 731 arranged on the central side in the second direction.

[0087] 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.

[0088] Similarly, in the fourth conductive adhesive 74, the conductivity of the fourth coating portions 741 disposed on both end sides in the second direction is greater than the conductivity of the fourth coating portions 741 disposed on the central side in the second direction.

[0089] Specifically, for example, the intervals of the fourth coating portions 741 disposed on both end sides in the second direction in the second direction are smaller than the intervals of the fourth coating portions 741 disposed in the central portion in the second direction in the second direction.

[0090] Generally, in the power storage stack 20, the peripheral portion side of the current collector plate disposed on both end portions sides in the stacking direction (first direction) has a tendency to increase heat release to the storage space. Therefore, by increasing the conductivity of the third coating portion 731 and the fourth coating portion 741 disposed in the region where heat release increases, it is also possible to reduce the temperature deviation caused by heat release.

[0091] In addition, although the case where the conductivity of the coating portions disposed on both end sides in the second direction in both the third conductive adhesive 73 and the fourth conductive adhesive 74 is greater than the conductivity of the coating portions disposed in the central portion in the second direction is illustrated, it is not limited thereto. As long as the above-described conductivity relationship holds in at least one of the third conductive adhesive 73 and the fourth conductive adhesive 74.

[0092] In addition, in the above, as an example of adjusting the conductivity, the case of adjusting the interval of the coating portions is illustrated, but it is not limited thereto. It may also be that the content rate of the metal fine particles included in the coating portions disposed on both end sides in the second direction is greater than the content rate of the metal fine particles included in the coating portions disposed in the central portion in the second direction. In this case, the intervals of the plurality of coating portions may also be constant (fixed).

[0093] Embodiment 3

[0094] Figure 5 It is a schematic plan view showing the shape and positional relationship of the first conductive adhesive and the second conductive adhesive in the power storage device according to Embodiment 3. Refer to Figure 5 , and the power storage device according to Embodiment 3 will be described.

[0095] As Figure 5 shown, compared with the power storage device 100 according to Embodiment 1, the shapes of the first conductive adhesive 71 and the second conductive adhesive 72 are different in the power storage device according to Embodiment 3. Other configurations are substantially the same.

[0096] 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 adjacent to each other on one side and the other side in the third direction alternately.

[0097] 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 adjacent to each other on one side and the other side in the third direction alternately.

[0098] In such a configuration, the power storage device according to Embodiment 3 also achieves substantially the same effects as the power storage device 100 according to Embodiment 1.

[0099] Other modification examples

[0100] In the above-described Embodiment 1, an example is shown in which each of the plurality of first coating portions 711 and the plurality of second coating portions 721 has substantially the same 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 conductivity of the coating portions disposed on both end sides in the second direction may be greater than the conductivity of the coating portions disposed on the central side in the second direction.

[0101] Generally, in the power storage module 21, there is a tendency that the current density in the direction of the end portion is smaller than the current density in the central portion. By adjusting the conductivity of the coating portion as described above, the temperature deviation caused by the current density distribution can be reduced.

[0102] Specifically, as the adjustment of the conductivity, for example, the interval in the second direction of the coating portions disposed on both end sides in the second direction may be made smaller than the interval in the second direction of the coating portions disposed on the central side in the second direction. Alternatively, the content ratio of the metal fine particles contained in the coating portions disposed on both end sides in the second direction may be made greater than the content ratio of the metal fine particles contained in the coating portions disposed on the central side in the second direction.

[0103] The embodiments disclosed this time are illustrative in all aspects and not restrictive. The scope of the present invention is shown by the claims and includes all modifications within the meaning and scope equivalent to the claims.

Claims

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

2. The power storage stack according to claim 1, The first conductive adhesive has a first connecting portion that connects first applied portions adjacent to each other in the second direction. The second conductive adhesive has a second connecting portion that connects the second applied portions adjacent to each other in the second direction. When viewed from the first direction, the first connection portion and the second connection portion at least partially overlap.

3. The power storage stack according to claim 1, In at least one of the plurality of first coating portions and the plurality of second coating portions, the coating portions disposed at both end sides in the second direction have a higher electrical conductivity than the coating portion disposed at the center side in the second direction.

4. The power storage stack according to any one of claims 1 to 3, The power storage stack further includes a first current collecting plate and a second current collecting plate. The first collector plate and the second collector plate are arranged so that the conductive member between the plurality of power storage modules and the power storage modules adjacent to each other in the first direction is sandwiched between the first collector plate and the second collector plate 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 closest to the first 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. The second main surface of the power storage module located closest to the other side in the first direction among the plurality of power storage modules 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 application portions arranged at intervals in the second direction. The fourth conductive adhesive includes, at least in part, a plurality of fourth application portions arranged at intervals in the second direction. In at least one of the plurality of third coating portions and the plurality of fourth coating portions, the coating portions disposed at both end sides in the second direction have a higher electrical conductivity than the coating portion disposed at the center side in the second direction.

5. The power storage stack according to claim 4, In at least one of the plurality of third coating parts and the plurality of fourth coating parts, coating parts arranged at both ends in the second direction are spaced smaller in the second direction than coating parts arranged in the center in the second direction.

6. The power storage stack according to claim 4, In at least one of the plurality of third coating portions and the plurality of fourth coating portions, the coating portions arranged at both ends in the second direction contain a higher content of metal particles than the coating portion arranged in the center in the second direction.

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