Cell stack device and electrochemical device

Abstract

This cell stack device comprises a cell stack in which a plurality of electrochemical cell units are stacked, a base, and a top plate member. The electrochemical cell units each comprise: an electrochemical cell including an adsorbent that adsorbs carbon dioxide; and a pair of pressing members that press the electrochemical cell in the thickness direction. The base fixes the cell stack. The top plate member is positioned on the opposite side from the base with the cell stack therebetween, and the cell stack is sandwiched between the top plate member and the base. The base has a first energized section. The top plate member has a second energized section.

Description

Cell stack device and electrochemical device

[0001] The present disclosure relates to a cell stack device and an electrochemical device.

[0002] 2. Description of the Related Art There is known a device that contains an electrochemical cell that absorbs carbon dioxide in a housing and recovers carbon dioxide from a gas.

[0003] JP 2024-10906 A

[0004] A cell stack device according to one aspect of the embodiment includes a cell stack in which multiple electrochemical cell units are stacked, a base, and a top plate member. The electrochemical cell unit includes an electrochemical cell having an adsorbent that adsorbs carbon dioxide, and a pair of pressing members that press the electrochemical cell in the thickness direction. The base secures the cell stack. The top plate member is located on the opposite side of the base across the cell stack, and sandwiches the cell stack between the base and the top plate member. The base has a first current-carrying portion. The top plate member has a second current-carrying portion.

[0005] FIG. 1 is a perspective view showing an example of a cell stack device according to the first embodiment. FIG. 2 is a cross-sectional view showing an example of an electrochemical cell unit included in the cell stack device according to the first embodiment. FIG. 3 is a cross-sectional view showing another example of an electrochemical cell unit included in the cell stack device according to the first embodiment. FIG. 4 is a plan view showing an example of a cell stack device according to the first embodiment. FIG. 5 is a perspective view illustrating an example of a conductive portion included in the cell stack device according to the first embodiment. FIG. 6 is a partially enlarged perspective view of the cell stack device according to the first embodiment. FIG. 7 is a perspective view illustrating an example of a spacer included in the cell stack device according to the first embodiment. FIG. 8 is a partially enlarged perspective view of the cell stack device according to the first embodiment. FIG. 9 is a perspective view showing an example of an electrochemical device according to the first embodiment. FIG. 10 is a perspective view showing an example of a cell stack device according to a second embodiment. FIG. 11A is a diagram illustrating an example of a first conductive portion included in the cell stack according to the second embodiment. FIG. 11B is a diagram illustrating an example of a first conductive portion included in the cell stack according to the second embodiment. FIG. 11C is a diagram showing an example of a first conductive portion included in the cell stack according to the second embodiment. FIG. 11D is a diagram showing an example of a first conductive portion included in the cell stack according to the second embodiment. FIG. 12A is a diagram showing an example of a second conductive portion included in the cell stack according to the second embodiment. FIG. 12B is a diagram showing an example of a second conductive portion included in the cell stack according to the second embodiment. FIG. 12C is a diagram showing an example of a second conductive portion included in the cell stack according to the second embodiment. FIG. 12D is a diagram showing an example of a second conductive portion included in the cell stack according to the second embodiment. FIG. 13 is a perspective view showing an example of a cell stack device according to a third embodiment. FIG. 14A is a diagram showing an example of a second conductive portion included in the cell stack according to the third embodiment. FIG. 14B is a view of the second conductive portion shown in FIG. 14A from another direction. FIG. 15A is a cross-sectional view showing an example of an electrochemical device according to the third embodiment. FIG. 15B is a transverse cross-sectional view of the electrochemical device shown in FIG. 15A.

[0006] In the above-described system, there is room for improvement in the workability when assembling a cell stack in which electrochemical cells are stacked, for example.

[0007] Therefore, there is a need to provide a cell stack device and an electrochemical device that can improve workability.

[0008] Hereinafter, embodiments of the cell stack device and electrochemical device disclosed in the present application will be described in detail with reference to the accompanying drawings. However, the disclosure is not limited to the embodiments described below.

[0009] It should also be noted that the drawings are schematic and that the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may contain parts whose dimensional relationships and ratios differ from one another.

[0010] For ease of understanding, each drawing shows a three-dimensional Cartesian coordinate system including a Z axis, with the vertical upward direction being the positive direction and the vertical downward direction being the negative direction. Similar components in each drawing are given the same reference numerals, and their description will be omitted or simplified.

[0011] [First embodiment] <Configuration of electrochemical device> Fig. 1 is a perspective view showing an example of a cell stack device according to Embodiment 1. As shown in Fig. 1, the cell stack device 100 includes a cell stack 50, a base 60, and a top plate member 70.

[0012] The cell stack 50 includes cell units 10. The cell units 10 are electrochemical cell units having electrochemical cells that capture carbon dioxide in gas. The cell stack 50 is a structure in which a plurality of cell units 10 are stacked.

[0013] The base 60 fixes the cell stack 50. The top plate member 70 is located on the opposite side of the base 60 with the cell stack 50 in between, and holds the cell stack 50 between the base 60 and itself.

[0014] The base 60 may be conductive. That is, the base 60 may be a current-carrying portion. The base 60 may also be insulating or have low conductivity. When the base 60 is insulating or has low conductivity, the base 60 has a current-carrying portion that conducts electricity with the cell stack 50. In other words, the base 60 has a first current-carrying portion.

[0015] The top plate member 70 may be conductive. That is, the top plate member 70 may be a current-carrying portion. The top plate member 70 may also be insulating or have low conductivity. When the top plate member 70 is insulating or has low conductivity, the top plate member 70 has a current-carrying portion that conducts electricity with the cell stack 50. In other words, the top plate member 70 has a second current-carrying portion.

[0016] The top plate member 70 may have a protruding portion 71 that protrudes toward the cell stack 50. The protruding portion 71 may be conductive and may be electrically connected to the cell stack 50. This ensures electrical continuity between the top plate member 70 and the cell stack 50. Furthermore, gas containing carbon dioxide can easily flow through the space created between the top plate member 70 and the cell stack 50, which improves the efficiency of carbon dioxide capture by the cell stack 50. Note that if the top plate member 70 including the protruding portion 71 is insulating or has low conductivity, the top plate member 70 has an electrically conducting portion that conducts electricity with the cell stack 50. In other words, the top plate member 70 has a second electrically conducting portion.

[0017] In this way, since the base 60 and the top plate member 70 have conductive parts, voltage can be easily applied to the cell stack 50 by connecting these conductive parts to an external power supply (not shown). Therefore, the cell stack device 100 according to this embodiment improves workability. Furthermore, the cell stack device 100 according to this embodiment also facilitates connection, for example, when connecting multiple cell stack devices 100.

[0018] The base 60 may be electrically connected to one of the first electrode 11 and the second electrode 12, which will be described later. The top plate member 70 may be electrically connected to the other of the first electrode 11 and the second electrode 12. In this way, when the base 60 and the top plate member 70 are electrically connected to the first electrode 11 or the second electrode 12, respectively, electricity can be passed between the first electrode 11 and the second electrode 12 with a simple configuration.

[0019] <Configuration of Electrochemical Cell Unit> Figure 2 is a cross-sectional view showing an example of an electrochemical cell unit included in the cell stack device according to the first embodiment. As shown in Figure 2, the cell unit 10 includes a cell 1 and a pressing member 20. The cell 1 includes a first electrode 11, a second electrode 12, and an insulating layer 13. The first electrode 11 and the second electrode 12 face each other with the insulating layer 13 sandwiched therebetween.

[0020] The cell 1 is connected to a power supply (not shown) that applies a voltage between the first electrode 11 and the second electrode 12. The cell 1 is an electrochemical cell that can repeatedly adsorb and desorb carbon dioxide by switching the voltage applied between the first electrode 11 and the second electrode 12.

[0021] The first electrode 11 may be a negative electrode to which electrons are supplied from the second electrode 12 in the adsorption mode in which the cell 1 adsorbs carbon dioxide.

[0022] The first electrode 11 is made of a conductive material through which a gas containing carbon dioxide can pass. For example, a metal material obtained by processing a metal such as Al or Ni into a porous or mesh shape can be used as the first electrode 11.

[0023] The first electrode 11 has an absorbent material 110. The absorbent material 110 is a CO ２ The absorbent 110 is an absorbent material. The absorbent 110 can adsorb and desorb carbon dioxide using an oxidation-reduction reaction. The absorbent 110 combines with carbon dioxide in the gas in a reduced state and adsorbs the carbon dioxide. The absorbent 110 also desorbs and releases carbon dioxide in an oxidized state.

[0024] The absorber 110 may be made of, for example, quinones, imines, imides, or derivatives thereof. For example, polyanthraquinone may be used as the quinone, polydiazaphthalimide as the imide, or polybenzothiadiazole as the imine. The polyanthraquinone may be, for example, poly(1,4-anthraquinone), poly(1,5-anthraquinone), poly(1,8-anthraquinone), or poly(2,6-anthraquinone).

[0025] The absorber 110 may be located inside the first electrode 11 or on the surface of the first electrode 11 facing the insulating layer 13 .

[0026] The second electrode 12 may be a positive electrode that releases electrons to the first electrode 11 in the adsorption mode in which the cell 1 adsorbs carbon dioxide.

[0027] The second electrode 12 may be, for example, a plate-shaped metal member. For example, a metal plate made by processing a metal such as Al into a plate shape can be used as the second electrode 12.

[0028] The second electrode 12 may have an electron supply material 120. The electron supply material 120 can transfer electrons between the second electrode 12 and the first electrode 11 by utilizing an oxidation-reduction reaction. The electron supply material 120 releases electrons in an adsorption mode in which the cell 1 adsorbs carbon dioxide. The electron supply material 120 also attracts electrons in a desorption mode in which the cell 1 desorbs carbon dioxide.

[0029] As the material for the electron donor 120, for example, a metal complex, an organic compound, an inorganic compound, a carbon material, etc. can be used. For example, ferrocene, nickelocene, cobaltocene, etc. can be used as the metal complex. These metal complexes may be polymers or monomers. In addition, poly(3-(4-fluorophenyl)thiophene), phenothiazine, etc. can be used as the organic compound, and RuO can be used as the inorganic compound. ２ , MnO ２ , MoS ２As the carbon material, carbon black, activated carbon, etc. may be used. The electron donor material 120 can be positioned on the surface of the second electrode 12 facing the insulating layer 13.

[0030] The insulating layer 13 is located between the first electrode 11 and the second electrode 12. The insulating layer 13 is a separator that prevents a short circuit between the first electrode 11 and the second electrode 12. For example, a porous separator can be used as the insulating layer 13. The insulating layer 13 may be, for example, a porous body made of resin or ceramic.

[0031] An electrolyte 130 is located in the insulating layer 13. The electrolyte 130 is not particularly limited, but may be, for example, an ion-bonding salt, a solid electrolyte, or an ion-conducting polymer.

[0032] The pressing member 20 is located on the opposite side of the insulating layer 13 with the first electrode 11 sandwiched therebetween. By pressing the cell 1, the pressing member 20 can reduce the occurrence of peeling or lifting of the first electrode 11 or the second electrode 12 of the cell 1 due to temperature changes, application of voltage, etc. This improves the reliability of the cell unit 10 according to this embodiment.

[0033] The pressing member 20 is, for example, a metal member having a desired rigidity. For example, stainless steel (SUS) or the like can be used as the pressing member 20.

[0034] FIG. 3 is a cross-sectional view showing another example of an electrochemical cell unit included in the cell stack device according to the first embodiment.

[0035] 3, the first electrode 11 of the cell 1 may have a first member 11a and a second member 11b. The first member 11a and the second member 11b may be positioned to face each other with the second electrode 12 interposed therebetween.

[0036] The insulating layer 13 may have a first insulating layer 13a located between the first member 11a and the second electrode 12, and a second insulating layer 13b located between the second member 11b and the second electrode 12.

[0037] In addition, the pressing member 20 may have a first pressing member 20a located on the opposite side of the first insulating layer 13a across the first member 11a, and a second pressing member 20b located on the opposite side of the second insulating layer 13b across the second member 11b.

[0038] 3, the cell 1 included in the cell unit 10 may have an insulating layer 13 and a first electrode 11 located on both sides of the second electrode 12. The pair of pressing members 20 may be arranged to press the first electrodes 11 located on both sides of the second electrode 12, respectively.

[0039] In this way, having the first member 11a and the second member 11b on both sides of the second electrode 12 increases the absolute amount of carbon dioxide that can be captured by the cell 1. Therefore, the cell unit 10 according to this embodiment makes it possible to reduce the size of the cell stack device 100, for example.

[0040] Furthermore, the cell unit 10 according to this embodiment is pressed by pressing members 20 located on both sides of the cell 1. Therefore, the cell unit 10 according to this embodiment can further reduce the occurrence of peeling or lifting of the first electrode 11 or the second electrode 12 of the cell 1 due to temperature changes, application of voltage, etc., thereby further improving reliability.

[0041] 1 and the drawings described below, a cell unit 10 having the cell 1 shown in Fig. 3 is illustrated as an example. In addition, in these drawings, the insulating layer 13 located between the first electrode 11 and the second electrode 12 is not illustrated.

[0042] <External Shape of Cell Stack Device> Fig. 4 is a plan view showing an example of a cell stack device according to the first embodiment. As shown in Fig. 4, when the cell stack device 100 is viewed in plan, the external shape of the top plate member 70 may be located inside the external shape of the base 60. This makes it easier to obtain the desired performance without increasing the size of the cell stack device 100. Note that the external shape of the top plate member 70 may match the external shape of the base 60.

[0043] <Configuration of Conduction Section> Fig. 5 is a perspective view for explaining an example of a conduction section provided in the cell stack device according to the first embodiment. Fig. 6 is a partially enlarged perspective view of the cell stack device according to the first embodiment.

[0044] 5 and 6, the pair of pressing members 20 of the cell unit 10, i.e., the first pressing member 20a and the second pressing member 20b, may be fixed using a fixing member 32. This makes it less likely that the cells 1 in the cell unit 10 will become misaligned.

[0045] Furthermore, when the first direction in which the carbon dioxide-containing gas flows is the Y-axis direction, the pressing member 20 may have a first extension portion 21 extending in a second direction perpendicular to the first direction, i.e., the X-axis direction, as shown in Fig. 5. The first extension portion 21 may have extension portions 21a to 21d located at four corners of the pressing member 20. Furthermore, the fixing member 32 may fix a pair of pressing members 20 at each of the extension portions 21a to 21d. This configuration makes it less likely that the flow of the carbon dioxide-containing gas will be disturbed. Furthermore, this configuration makes it easier to fix using the fixing member 32.

[0046] Furthermore, the fixing member 32 may fix the first conductive portion 30 to the first pressing member 20a, which is one of the pair of pressing members 20. The first conductive portion 30 is an example of a conductive portion that is electrically connected to the first electrode 11 via the pressing member 20.

[0047] The fixing member 32 may be, for example, a screw member made of metal. The fixing member 32 may also be conductive, which allows a voltage to be applied to both of the pair of pressing members 20. The material of the first conductive portion 30 may be the same as or different from the material of the pressing members 20 and / or the fixing member 32.

[0048] Furthermore, the first conductive portion 30 connected to the cell unit 10A and the first conductive portion 30 connected to the cell unit 10B adjacent to the cell unit 10A may be electrically connected using a conductor (not shown). This electrically connects the first electrodes 11 of the multiple cell units 10 that make up the cell stack 50. Such a conductor may be, for example, a lead wire. Note that FIG. 6 illustrates a state in which one of the first conductive portions 30 is removed.

[0049] The first conductive part 30 may be connected to a second conductive part of the top plate member 70. This facilitates electrical connection between the first electrode 11 and the top plate member 70.

[0050] According to the cell stack 50 of this embodiment, the first conductive part 30 can be attached and detached after the cell unit 10 is assembled, improving workability.

[0051] <Spacer Configuration> Fig. 7 is a perspective view for explaining an example of a spacer provided in the cell stack device according to the first embodiment. Fig. 8 is an enlarged perspective view of a portion of the cell stack device according to the first embodiment.

[0052] 7 and 8 , the second electrode 12 of the cell unit 10 is fixed using the second conductive part 40. The first conductive part 30 and the second conductive part 40 may be aligned along the first direction in which the carbon dioxide-containing gas flows, i.e., the Y-axis direction.

[0053] 8, the second conductive portion 40 may have a spacer portion 41. As a result, the second conductive portion 40 is an example of a spacer that can appropriately maintain the distance between adjacent cell units 10. Note that FIGS. 7 and 8 show a state in which one of the second conductive portions 40 is removed.

[0054] 7, the second electrode 12 may have a second extension portion 12a extending in a second direction perpendicular to the first direction, i.e., in the X-axis direction perpendicular to the Y-axis direction. The second extension portion 12a may have extension portions 12aa to 12ad at four locations on the second electrode 12, and the second conduction portion 40 may fix adjacent second electrodes 12 to each other at each of the extension portions 12aa to 12ad. This configuration makes it less likely that the flow of the carbon dioxide-containing gas will be disturbed. Furthermore, this configuration makes it easier to fix the second electrodes 12 using the second conduction portion 40.

[0055] Furthermore, in the first direction, i.e., the Y-axis direction, the second conductive portion 40 may be located between two first conductive portions 30. Note that although the drawings show an example in which the second conductive portion 40 is located between two first conductive portions 30, the first conductive portion 30 may also be located between two second conductive portions 40.

[0056] Furthermore, the first conductive portion 30 may have a different shape from the second conductive portion 40. This makes it easier for the first conductive portion 30 to follow deformations of the cell stack 50, etc.

[0057] Furthermore, the second conductive part 40 may have an external thread part 42 and an internal thread part 43. The internal thread part 43 is configured to screw into the external thread part 42 of an adjacent second conductive part 40. This facilitates assembly of the cell unit 10. The material of the second conductive part 40 may be the same as or different from the material of the first conductive part 30.

[0058] The second conductive portion 40 may be conductive, and can electrically connect the second electrodes 12 of the cell units 10 to each other.

[0059] The second conductive part 40 may be connected to a first current-carrying part of the base 60. This facilitates electrical connection between the second electrode 12 and the base 60.

[0060] According to the cell stack 50 of this embodiment, the second conductive part 40 can be attached and detached after the cell unit 10 is assembled, improving workability.

[0061] <Configuration of Electrochemical Device> Fig. 9 is a perspective view showing an example of an electrochemical device according to Embodiment 1. Note that Fig. 9 schematically shows the outer shape of the electrochemical device including a cell stack device 100.

[0062] 9, the electrochemical device 200 includes the cell stack device 100 and a lid member 80. The lid member 80 is placed on a base 60 and covers the cell stack 50.

[0063] The lid member 80 may have a cover portion 81 and a flange portion 82. The cover portion 81 is a portion that covers the cell stack device 100 including the cell stack 50. The cover portion 81 may have a first portion 81a, a second portion 81b, and a third portion 81c.

[0064] The first portion 81a and the second portion 81b are located on opposite sides of the cell stack device 100. The third portion 81c is located on the positive Z-axis side of the cell stack device 100, and connects the first portion 81a and the second portion 81b.

[0065] The third portion 81c is located on the opposite side of the base 60 with the cell stack 50 in between. The third portion 81c may be in close contact with the top plate member 70. The third portion 81c may also have an opening 83 that overlaps with the top plate member 70 in a plan view. The opening 83 is a through-hole that penetrates the third portion 81c in the thickness direction, i.e., in the Z-axis direction. The opening 83 in the cover member 80 facilitates electrical conduction between an external power source (not shown) and the top plate member 70.

[0066] The flange portion 82 is a portion that extends outward from the cover portion 81. The flange portion 82 is located so as to face the base 60. The flange portion 82 may be integral with the cover portion 81. The flange portion 82 may also be configured as a separate member that is different from the cover portion 81.

[0067] Second Embodiment <Configuration of Cell Stack Device> Fig. 10 is a perspective view showing an example of a cell stack device according to a second embodiment. As shown in Fig. 10, the cell stack device 100 may have first conductive parts 30 and second conductive parts 40 with shapes different from those described above.

[0068] As shown in Figure 10, the cell stack device 100 includes a cell stack 50 having a plurality of cell units 10. The cell stack device 100 may also include a base 60 and a top plate member 70. The base 60 and the top plate member 70 may be positioned to sandwich the cell stack 50 from both sides in the thickness direction, i.e., the Z-axis direction. The cell stack device 100 may be configured to support and fix the cell stack 50 by applying a predetermined pressure between the lower surface 62 of the base 60 and the upper surface 72 of the top plate member 70.

[0069] The cell unit 10 includes a cell unit 10A, a cell unit 10B in contact with the cell unit 10A, a cell unit 10C in contact with the cell unit 10B, and a cell unit 10D in contact with the cell unit 10C.

[0070] Each cell unit 10 has a pressing member 20 electrically connected to the first electrode 11. The pressing member 20 has a first pressing member 20a and a second pressing member 20b.

[0071] The first pressing member 20a is electrically connected to the first member 11a. The first pressing member 20a has a first extending portion 21aa extending in the X-axis direction. The first extending portions 21aa of the cell unit 10A and the cell unit 10B are aligned along the thickness direction, i.e., the Z-axis direction. The first extending portions 21aa of each cell unit 10 may also be aligned along the thickness direction, i.e., the Z-axis direction.

[0072] The second pressing member 20b is electrically connected to the second member 11b. The second pressing member 20b has a first extending portion 21ba extending in the X-axis direction. The first extending portions 21ba of the cell unit 10A and the cell unit 10B are aligned along the thickness direction, i.e., the Z-axis direction. The first extending portions 21ba of each cell unit 10 may also be aligned along the thickness direction, i.e., the Z-axis direction.

[0073] The first conductive portion 30 has first conductive members 30a and 30b. The first conductive member 30a is bonded to the first extending portion 21aa that is adjacent to the cell unit 10A in the thickness direction, i.e., the Z-axis direction. For example, the first conductive member 30a is bonded to the first extending portion 21aa of the cell unit 10A and the first extending portion 21aa of the cell unit 10B. The first conductive member 30b is bonded to the first extending portion 21ba of the cell unit 10A and the first extending portion 21ba of the cell unit 10B. In other words, the first conductive portion 30 is bonded to the first extending portion 21aa or the first extending portion 21ba that is adjacent to the cell unit 10A in the thickness direction, i.e., the Z-axis direction.

[0074] The first conductive portion 30 and the first extending portion 21aa or the first extending portion 21ba may be joined by, for example, welding or by bonding using a conductive adhesive such as ceramic. The first conductive portion 30 and the first extending portion 21aa or the first extending portion 21ba may also be joined by a combination of the above-described methods. The specific shape of the first conductive portion 30 according to this embodiment will be described later.

[0075] The cell stack 50 may further include a connection portion 31 that electrically connects the first conductive members 30a, 30b. The connection portion 31 may include a connection portion 31a that connects the first extension portion 21aa and the first extension portion 21ba of the cell unit 10A. The connection portion 31 may include a connection portion 31b that connects the first extension portion 21aa and the first extension portion 21ba of the cell unit 10B. This further improves the reliability of the cell stack 50. The material of the connection portion 31 may be the same as or different from the material of the first conductive portion 30. The first conductive portion 30 and the connection portion 31 may be formed integrally.

[0076] The cell unit 10 has a second electrode 12 located between the first member 11a and the second member 11b. The second electrode 12 may have a second extension portion 12a extending in the X-axis direction.

[0077] The second conductive portion 40 has second conductive members 40a and 40b. The second conductive portions 40 are respectively joined to the second extending portions 12a of the second electrodes 12 that are adjacent in the thickness direction, i.e., the Z-axis direction. The second conductive members 40a are respectively joined to the second extending portions 12a of the cell unit 10B and the second extending portions 12a of the cell unit 10D, for example. The second conductive members 40b are respectively joined to the second extending portions 12a of the cell unit 10A and the second extending portions 12a of the cell unit 10C, for example.

[0078] The second conductive portion 40 and the second extending portion 12a may be joined by, for example, welding or by bonding using a conductive adhesive such as ceramic. The second conductive portion 40 and the second extending portion 12a may also be joined by a combination of the above-mentioned methods. The specific shape of the second conductive portion 40 according to this embodiment will be described later.

[0079] 11A to 11D are diagrams illustrating an example of a first conductive portion of a cell stack according to the second embodiment. As shown in FIG. 11A , the first conductive portion 30 may be an annular member surrounding adjacent first extension portions 21aa in the thickness direction, i.e., the Z-axis direction. The first conductive portion 30 may be bonded to a surface 201 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10A that is farther from the first member 11a, and a surface 202 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10B that is closer to the first member 11a. The first conductive portion 30 may be bonded to a side surface 203 of the first extension portion 21aa of the cell unit 10A and / or the cell unit 10B.

[0080] Also, as shown in Figure 11B, the first conductive portion 30 may be joined to the surface 201 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10A and the surface 201 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10B.

[0081] Also, as shown in Figure 11C, the first conductive portion 30 may have a U-shape that surrounds the surface 201 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10A, the surface 202 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10B, and the side surface 203 of the first extension portion 21aa of the first pressing members 20a of the cell unit 10A and the cell unit 10B, respectively.

[0082] Also, as shown in Figure 11D, the first conductive portion 30 may be a V-shaped leaf spring member joined to the surface 202 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10A and the surface 201 of the first extension portion 21aa of the first pressing member 20a of the cell unit 10B.

[0083] Note that the first conductive portion 30 is not limited to the shape shown in the drawings, and may be, for example, a plate-shaped, columnar, or rod-shaped member. Also, while Figures 11A to 11D have described the first conductive member 30a as an example of the first conductive portion 30, the same may be applied to the shape of the first conductive member 30b. The shapes of the first conductive member 30a and the first conductive member 30b may be the same or different.

[0084] 11A to 11D, the first conductive member 30a is located at the end on the negative side of the X-axis as the first conductive portion 30, but the first conductive portion 30 may be located at the end on the positive side of the X-axis. In other words, the first conductive members 30a and 30b may be located at both ends in the second direction.

[0085] The first conductive portions 30 adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other. Specifically, the first conductive members 30a adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other using a conductor (not shown). Furthermore, the first conductive members 30b adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other using a conductor (not shown). This electrically connects the first electrodes 11 of the multiple cell units 10 that make up the cell stack 50 to each other. Such a conductor may be, for example, a lead wire.

[0086] 12A to 12D are diagrams illustrating an example of a second conductive portion of a cell stack according to the second embodiment. As illustrated in FIG. 12A , the second conductive portion 40 may be an annular member surrounding adjacent second extension portions 12a in the thickness direction, i.e., the Z-axis direction. The second conductive portion 40 may be bonded to a surface 121 of the second extension portion 12a of the second electrode 12 of the cell unit 10A that is closer to the first member 11a, and a surface 122 of the second extension portion 12a of the second electrode 12 of the cell unit 10C that is closer to the second member 11b. The second conductive portion 40 may be bonded to a side surface 123 connecting the surface 121 and the surface 122 of the second extension portion 12a of the cell unit 10A and / or the cell unit 10C.

[0087] 12B, the second conductive portion 40 may be bonded to the surface 122 of the second extension portion 12a of the second electrode 12 of the cell unit 10A and the surface 121 of the second extension portion 12a of the second electrode 12 of the cell unit 10C. In this case, as shown in FIGS. 12C and 12D, the second conductive portion 40 may have a U-shape. The U-shaped second conductive portion 40 may be open in the Y-axis direction (see FIG. 12C). The U-shaped second conductive portion 40 may be open in the X-axis direction (see FIG. 12D).

[0088] The second conductive portion 40 is not limited to the shape shown in the drawings, and may be, for example, a plate-shaped, columnar, or rod-shaped member. Although the second conductive member 40b is used as an example of the second conductive portion 40 in FIGS. 12A to 12D, the second conductive portion 40 may have any shape other than the second conductive member 40a. The shape of the first conductive portion 30 shown in FIGS. 11A to 11D may be applied to the shape of the second conductive portion 40. The shape of the second conductive portion 40 shown in FIGS. 12A to 12D may be applied to the shape of the first conductive portion 30.

[0089] 12A to 12D, the second conductive member 40b located at the end on the negative side of the X-axis has been described as an example of the second conductive portion 40, but the second conductive portion 40 may be located at the end on the positive side of the X-axis. In other words, the second conductive members 40a and 40b may be located at both ends in the second direction.

[0090] The second conductive portions 40 adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other. Specifically, the second conductive members 40a adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other using a conductor (not shown). Furthermore, the second conductive members 40b adjacent to each other in the thickness direction, i.e., the Z-axis direction, may be electrically connected to each other using a conductor (not shown). This electrically connects the second electrodes 12 of the multiple cell units 10 that make up the cell stack 50 to each other. Such a conductor may be, for example, a lead wire.

[0091] Furthermore, the cell stack 50 according to this embodiment may not have the connection portion 31 that electrically connects the first conductive members 30 a and 30 b. In such a case, the first conductive members 30 a and 30 b may be disposed independently of each other (see, for example, FIGS. 11A to 11D).

[0092] 10 , the second conductive members 40a, 40b are located at both ends along the Y-axis direction, and the first conductive members 30a, 30b are located between the second conductive members 40a, 40b. However, the arrangement of the first conductive portion 30 and the second conductive portion 40 is not limited to this. For example, the first conductive members 30a, 30b may be located at both ends along the Y-axis direction, and the second conductive members 40a, 40b may be located between the first conductive members 30a, 30b. In such a case, the cell stack 50 may further include a connection portion that electrically connects the second conductive members 40a, 40b.

[0093] According to the cell stack 50 of this embodiment, the first conductive part 30 and the second conductive part 40 can be attached after the cell unit 10 is assembled, improving workability.

[0094] [Third embodiment] <Configuration of cell stack device> Fig. 13 is a perspective view showing an example of a cell stack device according to a third embodiment. The cell stack device 100 shown in Fig. 13 may have a first conductive part 30 and a second conductive part 40 that are different from those of the cell stack device 100 shown in Fig. 10.

[0095] <Configuration of First Conductive Section> The first conductive section 30 includes conductive members 30A and 30B. The conductive member 30A is bonded to each of the first extending portions 21aa aligned in the thickness direction, i.e., the Z-axis direction. For example, the conductive member 30A includes the first extending portion 21aa of the first pressing member 20a of the cell unit 10A and the first extending portion 21aa of the first pressing member 20a of the cell unit 10B, and is bonded to all of the first extending portions 21aa aligned in the thickness direction, i.e., the Z-axis direction. The conductive member 30B includes the first extending portion 21ba of the second pressing member 20b of the cell unit 10A and the first extending portion 21ba of the second pressing member 20b of the cell unit 10B, and is bonded to all of the first extending portions 21ba aligned in the thickness direction, i.e., the Z-axis direction. In other words, the first conductive portion 30 is joined to all of the first extending portions 21aa or all of the first extending portions 21ba that are aligned in the thickness direction, that is, in the Z-axis direction.

[0096] The first conductive portion 30 may be comb-shaped and include a back portion 301 and a plurality of teeth 302. The teeth 302 may be joined to the first extending portions 21aa arranged in the thickness direction, i.e., the Z-axis direction. The back portion 301 may extend in the thickness direction, i.e., along the Z-axis direction, and may be configured to connect the plurality of teeth 302 to each other.

[0097] The first conductive portion 30 and the first extending portion 21aa or the first extending portion 21ba may be joined by, for example, welding or by adhesion using a conductive adhesive such as ceramic. The first conductive portion 30 and the first extending portion 21aa or the first extending portion 21ba may also be joined by a combination of the above-described methods. The first conductive portion 30 may be in contact with the first electrode 11.

[0098] The conductive members 30A, 30B may be electrically connected using a conductor (not shown), thereby electrically connecting the first electrodes 11 of the multiple cell units 10 that make up the cell stack 50. Such a conductor may be, for example, a lead wire.

[0099] 13 illustrates the first conductive portion 30 as the conductive members 30A and 30B located at the end on the negative side of the X-axis, but the first conductive portion 30 may be located at the end on the positive side of the X-axis. In other words, the conductive members 30A and 30B may be located at both ends in the second direction.

[0100] <Configuration of Second Conductive Section> The second conductive section 40 includes conductive members 40A and 40B. The conductive member 40A is bonded to each of the second extending portions 12a aligned in the thickness direction, i.e., the Z-axis direction. For example, the conductive member 40A includes the second extending portion 12a of the second electrode 12 of the cell unit 10B and the second extending portion 12a of the second electrode 12 of the cell unit 10D, and is bonded to all of the second extending portions 12a aligned in the thickness direction, i.e., the Z-axis direction. The conductive member 40B includes the second extending portion 12a of the second electrode 12 of the cell unit 10A and the second extending portion 12a of the second electrode 12 of the cell unit 10B, and is bonded to all of the second extending portions 12a aligned in the thickness direction, i.e., the Z-axis direction. In other words, the second conductive portion 40 is bonded to each of all the second extending portions 12a arranged in the thickness direction, i.e., the Z-axis direction.

[0101] The second conductive portion 40 may be comb-shaped and include a spine 401 and multiple teeth 402. The teeth 402 are joined to the second extending portions 12a aligned in the thickness direction, i.e., the Z-axis direction. The spine 401 extends in the thickness direction, i.e., along the Z-axis direction, and connects the multiple teeth 402 to each other.

[0102] The second conductive portion 40 and the second extending portion 12a may be joined by, for example, welding or by adhesion using a conductive adhesive such as ceramic. The second conductive portion 40 and the second extending portion 12a may also be joined by a combination of the above-mentioned methods.

[0103] According to the cell stack 50 of this embodiment, the first conductive part 30 and the second conductive part 40 can be attached after the cell unit 10 is assembled, improving workability.

[0104] Fig. 14A is a diagram showing an example of a second conductive part included in a cell stack according to Embodiment 3. Fig. 14B is a diagram showing the second conductive part shown in Fig. 14A as viewed from another direction.

[0105] In the cell stack device 100 according to this embodiment, when a carbon dioxide-containing gas flows along the first direction from the negative Y-axis side to the positive Y-axis side, the conductive member 40B is located closest to the gas introduction side of the first conductive portion 30 and the second conductive portion 40. The conductive member 40B may be connected to the side surface 123 of the second extension portion 12a that is located on the gas introduction side. This makes it easier for the carbon dioxide-containing gas to be supplied to the interior of the cell stack 50.

[0106] The conductive members 40A, 40B may be electrically connected using a conductor (not shown), thereby electrically connecting the second electrodes 12 of the multiple cell units 10 that make up the cell stack 50. Such a conductor may be, for example, a lead wire.

[0107] 13 illustrates the conductive members 40A and 40B located at the end on the negative side of the X-axis as the second conductive portion 40, but the second conductive portion 40 may be located at the end on the positive side of the X-axis. In other words, the conductive members 40A and 40B may be located at both ends in the second direction.

[0108] <Configuration of Electrochemical Device> Fig. 15A is a cross-sectional view showing an example of an electrochemical device according to the third embodiment. As shown in Fig. 15A, in the cell stack device 100, the top plate member 70 and the base 60 may be fastened together by fastening members 90. The fastening members 90 may be insulating. This makes it possible to avoid a short circuit between the conductive top plate member 70 and the base 60 via the fastening members 90. The fastening members 90 may be, for example, a pair of an externally threaded bolt and an internally threaded nut. This makes it possible to apply an appropriate pressure to the cell stack 50, improving performance.

[0109] The electrochemical device 200 may also include a cover member 92. The cover member 92 may be located between the top plate member 70 and the base 60, and may be located so as to surround the cell stack device 100. This is expected to improve the carbon dioxide recovery efficiency in the cell stack device 100 housed inside the cover member 92. The cover member 92 may be located outside or inside the fastening member 90. The cover member 92 may also be fixed to the fastening member 90.

[0110] Fig. 15B is a cross-sectional view of the electrochemical device shown in Fig. 15A. Note that the fastening member 90 is not shown in Fig. 15B.

[0111] As shown in Figure 15B, the cover member 92 has a first inner surface 92a, a second inner surface 92b facing the first inner surface 92a across the cell stack 50, and a third inner surface 92c and a fourth inner surface 92d connecting the first inner surface 92a and the second inner surface 92b.

[0112] The first inner surface 92a has an inlet 93 that introduces gas containing carbon dioxide into the interior of the cover member 92. The second inner surface 92b has an outlet 94 that discharges gas discharged from the cell stack 50 to the outside of the cover member 92. The third inner surface 92c connects the end of the first inner surface 92a located on the positive side of the Y axis with the end of the second inner surface 92b. The fourth inner surface 92d connects the end of the first inner surface 92a located on the negative side of the Y axis with the end of the second inner surface 92b.

[0113] The distance between the third inner surface 92c and the cell stack 50 and the distance between the fourth inner surface 92d and the cell stack 50 may be smaller than the distance between the first inner surface 92a and the cell stack 50. This makes it easier for the gas containing carbon dioxide introduced into the inside of the cover member 92 from the inlet 93 to be supplied into the inside of the cell stack 50. Therefore, the electrochemical device 200 according to this embodiment improves the efficiency of capturing carbon dioxide.

[0114] The distance between the first inner surface 92a and the cell stack 50 and the distance between the second inner surface 92b and the cell stack 50 may be the same. Also, the distance between the third inner surface 92c and the cell stack 50 and the distance between the fourth inner surface 92d and the cell stack 50 may be the same. This makes it easier to apply an appropriate pressure to the cell stack 50, improving performance.

[0115] The cell stack device 100 of the electrochemical device 200 of this embodiment may be replaced with the cell stack device 100 of the second embodiment. Also, the cell stack 50 of the electrochemical device 200 of this embodiment may be replaced with the cell stack 50 of the first embodiment.

[0116] The present disclosure has been described in detail above, but the present disclosure is not limited to the above-described embodiments, and various modifications, improvements, etc. are possible within the scope that does not deviate from the gist of the present disclosure.

[0117] In one embodiment, (1) a cell stack device includes: a cell stack in which electrochemical cell units each including an electrochemical cell having an adsorbent that adsorbs carbon dioxide and a pair of pressing members that press the electrochemical cell in the thickness direction are stacked; a base that fixes the cell stack; and a top plate member that is located on the opposite side of the base with the cell stack in between and that sandwiches the cell stack between the base and the top plate member, wherein the base has a first current-carrying portion, and the top plate member has a second current-carrying portion.

[0118] Furthermore, (2) in the cell stack device of (1) above, when viewed from above, the outer shape of the top plate member may be the same as the outer shape of the base, or may be located inside the outer shape of the base.

[0119] Also, (3) in the cell stack device of (1) or (2) above, the electrochemical cell may have: a first electrode having the adsorbent; a second electrode; and an insulating layer that electrically insulates the first electrode from the second electrode; the base may be electrically connected to one of the first electrode and the second electrode; and the top plate member may be electrically connected to the other of the first electrode and the second electrode.

[0120] Also, (4) in the cell stack device of (3) above, the electrochemical cell may have the insulating layer and the first electrode located on both sides of the second electrode, and the top plate member may be electrically connected to the first electrode via the pressing member.

[0121] Furthermore, (5) in the cell stack device of (4) above, the top plate member may have a protruding portion that protrudes toward the cell stack, and the protruding portion may be electrically connected to the cell stack.

[0122] Furthermore, (6) in the cell stack device of any one of (3) to (5) above, the second electrodes of the electrochemical cell units may be electrically connected to each other via a conductive spacer, and the spacer may be electrically connected to the first current-carrying portion.

[0123] Furthermore, (7) the cell stack device of (3) above may further include conductive parts connected to the second electrodes adjacent to each other in the thickness direction.

[0124] Furthermore, (8) in the cell stack device of (7) above, the conductive portion may be annular or U-shaped.

[0125] Furthermore, (9) in the cell stack device of (7) or (8) above, the electrochemical cell unit may have a plurality of conductive parts, and may further include a connection part that electrically connects the plurality of conductive parts of one electrochemical cell unit.

[0126] Furthermore, (10) in the cell stack device of (3) above, the top plate member and the base may be fastened together by an insulating fastening member.

[0127] In one embodiment, (11) an electrochemical device includes the cell stack device according to (10) above; and a cover member positioned between the top plate member and the base and covering the outer periphery of the cell stack device.

[0128] Furthermore, (12) in the electrochemical device of (11) above, the cover member includes: a first inner surface having an inlet portion for introducing the gas containing carbon dioxide into the cover member; a second inner surface facing the first inner surface across the cell stack and having an outlet portion for discharging the gas discharged from the cell stack to the outside of the cover member; a third inner surface connecting a first end of the first inner surface to a first end of the second inner surface; and a fourth inner surface facing the third inner surface across the cell stack and connecting a second end of the first inner surface to a second end of the second inner surface, and the distance between the third inner surface and the cell stack and the distance between the fourth inner surface and the cell stack may be smaller than the distance between the first inner surface and the cell stack.

[0129] In one embodiment, (13) an electrochemical device includes: a cell stack device according to any one of (1) to (9) above; and a lid member placed on the base and covering the cell stack.

[0130] The disclosed embodiments should be considered in all respects as illustrative and not restrictive. Indeed, the above-described embodiments may be embodied in various forms. Furthermore, the above-described embodiments may be omitted, substituted, or modified in various ways without departing from the scope and spirit of the appended claims.

[0131] REFERENCE SIGNS LIST 1 cell 10 cell unit 11 first electrode 12 second electrode 13 insulating layer 20 pressing member 30 first conductive portion 40 second conductive portion 50 cell stack 60 base 70 top plate member 80 cover member 100 cell stack device 200 electrochemical device

Claims

an electrochemical cell having an adsorbent that adsorbs carbon dioxide; a pair of pressing members that press the electrochemical cell in a thickness direction; a cell stack in which a plurality of electrochemical cell units each comprising the above-mentioned are stacked; a base for fixing the cell stack; a top plate member that is located on the opposite side of the base with the cell stack in between and that holds the cell stack between the base and the top plate member; Equipped with the base has a first current-carrying portion, The top plate member has a second conductive portion. Cell stack device. 　 When viewed from above, the outer shape of the top plate member is the same as the outer shape of the base or is located inside the outer shape of the base. The cell stack device according to claim 1 . 　 The electrochemical cell comprises: a first electrode having the adsorbent; A second electrode; an insulating layer that electrically insulates the first electrode from the second electrode; and the base is electrically connected to one of the first electrode and the second electrode; The top plate member is electrically connected to the other of the first electrode and the second electrode. The cell stack device according to claim 1 or 2. 　 the electrochemical cell has the insulating layer and the first electrode located on either side of the second electrode, The top plate member is electrically connected to the first electrode via the pressing member. The cell stack device according to claim 3 . 　 the top plate member has a protrusion that protrudes toward the cell stack, The protrusion is electrically connected to the cell stack. The cell stack device according to claim 4 . 　 the second electrodes of the electrochemical cell units are electrically connected to each other via a conductive spacer, The spacer is electrically connected to the first current-carrying portion. The cell stack device according to any one of claims 3 to 5. 　 Conductive portions are respectively joined to the second electrodes adjacent to each other in the thickness direction. The cell stack device according to claim 3 . 　 The conductive portion is annular or U-shaped. The cell stack device according to claim 7 . 　 the electrochemical cell unit has a plurality of conductive parts, The electrochemical cell unit further includes a connection portion that electrically connects the plurality of conductive portions of the electrochemical cell unit. The cell stack device according to claim 7 or 8. 　 The top plate member and the base are fastened together by an insulating fastening member. The cell stack device according to claim 3 . 　 The cell stack device according to claim 10; a cover member that is positioned between the top plate member and the base and covers the outer periphery of the cell stack device; An electrochemical device comprising: 　 The cover member is a first inner surface having an introduction portion for introducing the gas containing carbon dioxide into the inside of the cover member; a second inner surface facing the first inner surface across the cell stack and having an outlet portion that outlets gas discharged from the cell stack to the outside of the cover member; a third inner surface connecting a first end of the first inner surface and a first end of the second inner surface; a fourth inner surface that faces the third inner surface with the cell stack interposed therebetween and connects the second end of the first inner surface and the second end of the second inner surface; Including, The distance between the third inner surface and the cell stack and the distance between the fourth inner surface and the cell stack are smaller than the distance between the first inner surface and the cell stack.

12. The electrochemical device of claim 11. 　 The cell stack device according to any one of claims 1 to 9, a cover member placed on the base and covering the cell stack; An electrochemical device comprising:

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