Electrode laminate

Abstract

The present application provides an electrode stack, comprising: a plurality of electrode sheets stacked along a first direction; and a long-size separator extending in a meandering manner between the plurality of electrode sheets. The plurality of electrode sheets each comprise a current collector foil and an electrode active material layer provided on one surface of the current collector foil. In at least one of the plurality of electrode sheets, at least one protective member extending along an outer edge of the electrode active material layer is provided on at least one of the electrode sheet and the separator. The outer edge of the electrode active material layer has a shape with at least one corner. The at least one protective member extends across two edges defining each of the at least one corner.

Description

Technical Field

[0001] The technology disclosed in this specification relates to electrode stacks. Background Technology

[0002] Japanese Patent Application Publication No. 2009-218105 describes an electrode laminate. The electrode laminate comprises multiple stacked electrode sheets and an elongated diaphragm extending in a zigzag manner between the multiple electrode sheets. Each of the multiple electrode sheets comprises a current-collecting foil and an electrode active material layer disposed on one surface of the current-collecting foil. Summary of the Invention

[0003] In the aforementioned electrode stack, the outer edge of the electrode active material layer sometimes has a shape with at least one corner (e.g., a rectangular shape). The electrode active material layer has relatively high rigidity, so the corner of the electrode active material layer may come into contact with other components such as the outer casing of the electrode stack or the diaphragm extending between the electrode sheets, and damage those other components.

[0004] In view of the actual situation described above, this specification provides a technique for suppressing damage to other components caused by the corners of the electrode active material layer.

[0005] The technology disclosed in this specification is specifically embodied in an electrode laminate. In a first embodiment of this electrode laminate, the electrode laminate includes a plurality of electrode sheets stacked along a first direction and an elongated diaphragm extending in a zigzag manner between the plurality of electrode sheets. Each of the plurality of electrode sheets includes a current-collecting foil and an electrode active material layer disposed on one surface of the current-collecting foil. In at least one of the plurality of electrode sheets, at least one protective member extending along the outer edge of the electrode active material layer is disposed on at least one of the electrode sheet and the diaphragm. The outer edge of the electrode active material layer has a shape having at least one corner. The at least one protective member extends across both sides defining the at least one corner.

[0006] In the aforementioned electrode stack, a protective member extends along both sides defining the corner of the electrode active material layer. With this structure, since the protective member is positioned between the corner of the electrode active material layer and other components, damage to other components by the electrode active material layer can be prevented.

[0007] In a second embodiment, as in the first embodiment, the outer edge of the electrode active material layer has a rectangular shape with four corners. In this case, the at least one protective member may comprise four protective members respectively disposed at the four corners. With this structure, at each of the four corners of the electrode active material layer, a protective member can be positioned between the corner of the electrode active material layer and other members.

[0008] In a third embodiment, as in the first or second embodiment, the at least one protective member comprises an annular protective member extending integrally along the outer edge of the electrode active material layer. With this structure, the protective member can extend throughout the entire outer edge of the electrode active material layer, positioning it between the electrode active material layer and other members.

[0009] In the fourth approach, or any of the approaches from the first to the third approach, the plurality of electrode sheets may include a first electrode sheet and a second electrode sheet. In this case, the first electrode sheet may have a first electrode active material layer as the electrode active material layer. The second electrode sheet may have a second electrode active material layer opposite to the first electrode active material layer across the separator as the electrode active material layer. Alternatively, at least one of the first electrode sheet and the separator may have at least one first protective member extending along the outer edge of the first electrode active material layer. Alternatively, at least one of the second electrode sheet and the separator may have at least one second protective member extending along the outer edge of the second electrode active material layer. Alternatively, when viewed along the first direction, the position of the outer edge of the first electrode active material layer may differ from the position of the outer edge of the second electrode active material layer, while the position of the at least one first protective member may coincide with the position of the at least one second protective member. With such a structure, accidental bending or wrinkling of the current collector foil and / or separator is suppressed.

[0010] In the fifth embodiment, or any of the first to fourth embodiments, the at least one protective member is disposed relative to the electrode active material layer of at least one end of the plurality of electrode sheets located in the first direction. It is considered that the electrode active material layer of the electrode sheet located at one end in the first direction is more likely to cause damage to other components compared to the electrode active material layer of the inner electrode sheets. Therefore, according to the above structure, the number of electrode active material layers for which the protective member is disposed can be suppressed, and damage to other components by the electrode active material layers can be suppressed.

[0011] In the sixth embodiment, or any of the first to fifth embodiments, the at least one protective member is provided for each of the plurality of electrode sheets. With this structure, damage to other components by the electrode active material layer can be more reliably suppressed.

[0012] In the seventh embodiment, or in any of the first to sixth embodiments, the at least one protective member may be constructed of a sheet member made of the same material as the diaphragm. According to this structure, for example, the protective member can be constructed using the aforementioned sheet member disposed on the diaphragm.

[0013] In the eighth embodiment, it is also possible that, in any of the first to sixth embodiments, the at least one protective member is composed of a member different from the diaphragm.

[0014] In the ninth embodiment, it is also possible that, in any of the first to eighth embodiments, the dimension of the at least one protective member in the first direction is less than or equal to the dimension in the first direction of the electrode active material layer disposed on at least one of the plurality of electrode sheets. With this structure, the generation of gaps between the electrode active material layer and the separator in the first direction is suppressed. Attached Figure Description

[0015] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein:

[0016] Figure 1 This is a diagram that roughly shows the structure of battery 100;

[0017] Figure 2 This is a diagram illustrating that an electrode stack 10 is housed within an outer component 102;

[0018] Figure 3 This is a schematic diagram showing the structure of the electrode stack 10 of the embodiment;

[0019] Figure 4A yes Figure 3 Enlarged view of section IV(A) in the image;

[0020] Figure 4B yes Figure 3 Enlarged view of part IV(B) in the image;

[0021] Figure 5 This is a schematic diagram of the electrode stack 10 viewed along the Z direction;

[0022] Figure 6 yes Figure 5 Cross-sectional view at line VI-VI;

[0023] Figure 7A This is a diagram showing the first upper protective member 50a of the embodiment viewed along the Z direction;

[0024] Figure 7BThis is a diagram of the first upper protective member 50a of several modified examples observed along the Z direction;

[0025] Figure 7C This is a diagram of the first upper protective member 50a of several modified examples observed along the Z direction;

[0026] Figure 7D This is a diagram showing the first upper protective member 50a of several modified examples viewed along the Z direction; and

[0027] Figure 8 It is a variation of the example and Figure 6 The corresponding cross-sectional view. Detailed Implementation

[0028] Referring to the accompanying drawings, the electrode stack 10 and the battery 100 using the same embodiment will be described. The battery 100 is, for example, a lithium-ion secondary battery. The battery 100 has a rectangular flat plate shape. Hereinafter, the thickness direction of the battery 100 will be referred to as the Z direction, the length direction of the battery 100 will be referred to as the X direction, and the direction orthogonal to the Z direction and the X direction will be referred to as the Y direction.

[0029] like Figure 1 , Figure 2 As shown, the battery 100 includes an outer casing 102. Within the outer casing 102, the electrode laminate 10 and the electrolyte (not shown) are sealed together. The outer casing 102 is made of a thin film. For example, the outer casing 102 is a laminated film on both surfaces of an aluminum foil, with resin-coated films disposed thereon.

[0030] like Figure 1 As shown, the battery 100 also includes a positive terminal 104 and a negative terminal 106. One end of the positive terminal 104 protrudes to the outside of the outer casing 102, and the other end of the positive terminal 104 is embedded within the outer casing 102 with the positive current collector foils 22 of the electrode laminate 10 (see reference). Figure 4A The negative terminal 106 is connected to the outer casing 102 at one end. The other end of the negative terminal 106 is connected to the negative current collector foils 32 of the electrode laminate 10 (see reference 102) inside the outer casing 102. Figure 4B The positive terminal 104 can be connected to each positive current collector foil 22 via a tab integrally formed with each positive current collector foil 22, or via a tab joined to each positive current collector foil 22 by welding or the like. Similarly, the negative terminal 106 can be connected to each negative current collector foil 32 via a tab integrally formed with each negative current collector foil 32, or via a tab joined to each negative current collector foil 32 by welding or the like.

[0031] like Figure 3As shown, the electrode stack 10 includes a plurality of electrode sheets 20, 30 and a separator 40. The plurality of electrode sheets 20, 30 are stacked along the Z direction. The outer edge of each electrode sheet 20, 30 has a rectangular shape with four corners when viewed along the Z direction. The plurality of electrode sheets 20, 30 includes a plurality of positive electrode sheets 20 and a plurality of negative electrode sheets 30. The separator 40 is an elongated sheet. The separator 40 extends in a zigzag manner between the plurality of positive electrode sheets 20 and the plurality of negative electrode sheets 30. That is, the separator 40 is folded alternately and repeatedly by mountain folds and valley folds at predetermined intervals. Between the separators 40, the positive electrode sheets 20 and the negative electrode sheets 30 are stacked alternately one by one. Furthermore, the number of electrode sheets 20, 30 included in the electrode stack 10 is not particularly limited.

[0032] like Figure 4A As shown, the plurality of positive electrode sheets 20 each have a positive electrode current collector foil 22 and two positive electrode active material layers 24a and 24b. When viewed along the Z direction, the outer edges of the positive electrode current collector foil 22 and the positive electrode active material layers 24a and 24b each have a rectangular shape with four corners. The positive electrode current collector foil 22 is, for example, an aluminum foil. The two positive electrode active material layers 24a and 24b include an upper positive electrode active material layer 24a and a lower positive electrode active material layer 24b. The upper positive electrode active material layer 24a is disposed on one surface of the positive electrode current collector foil 22 in the Z direction (here, the surface in the +Z direction). The lower positive electrode active material layer 24b is disposed on the other surface of the positive electrode current collector foil 22 in the Z direction (here, the surface in the -Z direction). Furthermore, the terms "upper" and "lower" in this specification are for ease of explanation and do not limit the orientation of the electrode stack 10 during use or manufacture.

[0033] Each positive electrode active material layer 24a and 24b contains a positive electrode active material. Examples of positive electrode active materials include lithium-nickel composite oxides, lithium-cobalt composite oxides, and lithium-manganese composite oxides. The positive electrode active material can be composed of a single type of material or multiple materials. Each positive electrode active material layer 24a and 24b may further contain binders, conductive additives, etc.

[0034] like Figure 4BAs shown, the plurality of negative electrode sheets 30 each have a negative electrode current collector foil 32 and two negative electrode active material layers 34a and 34b. When viewed along the Z direction, the outer edges of the negative electrode current collector foil 32 and the negative electrode active material layers 34a and 34b each have a rectangular shape with four corners. The negative electrode current collector foil 32 is, for example, a copper foil. The two negative electrode active material layers 34a and 34b include an upper negative electrode active material layer 34a and a lower negative electrode active material layer 34b. The upper negative electrode active material layer 34a is disposed on one surface of the negative electrode current collector foil 32 in the Z direction (here, the surface in the +Z direction). The lower negative electrode active material layer 34b is disposed on the other surface of the negative electrode current collector foil 32 in the Z direction (here, the surface in the -Z direction). In each of the plurality of negative electrode sheets 30, the upper negative electrode active material layer 34a is opposed to the lower positive electrode active material layer 24b of the positive electrode sheet 20 adjacent above it, separated by a separator 40. In addition, the lower negative electrode active material layer 34b is opposite to the upper positive electrode active material layer 24a of the adjacent positive electrode plate 20 through the separator 40.

[0035] Each negative electrode active material layer 34a and 34b contains a negative electrode active material. Examples of negative electrode active materials include carbon materials such as graphite, hard carbon, and soft carbon; materials that form alloys with lithium, such as silicon (Si); and lithium alloys. The negative electrode active material can be composed of a single type of material or multiple materials. Each negative electrode active material layer 34a and 34b may further contain a binder, etc.

[0036] The separator 40 is configured to allow charge carriers (in this case, lithium ions) to pass through. The separator 40 is made of insulating materials such as polypropylene or polyethylene. Examples of separators 40 include porous polyethylene membranes and porous polypropylene membranes.

[0037] like Figure 5 , Figure 6 As shown, the electrode stack 10 also includes a plurality of protective members 50a, 50b, 52a, and 52b. In this embodiment, the plurality of protective members 50a, 50b, 52a, and 52b are respectively disposed on the diaphragm 40. Furthermore, the plurality of protective members 50a, 50b, 52a, and 52b are each constituted by a sheet member made of the same material as the diaphragm 40. That is, each protective member 50a, 50b, 52a, and 52b is constituted by the aforementioned sheet member disposed on the diaphragm 40.

[0038] like Figure 6 As shown, the plurality of protective members 50a, 50b, 52a, and 52b include a first upper protective member 50a, a first lower protective member 50b, a second upper protective member 52a, and a second lower protective member 52b. The first upper protective member 50a is provided to protect other components such as the separator 40 from the influence of the upper negative electrode active material layer 34a of the negative electrode sheet 30. Figure 7A As shown, the first upper protective member 50a has an annular shape extending along the entire outer edges 38a, 38b of the upper negative electrode active material layer 34a. With this structure, the first upper protective member 50a is positioned between the upper negative electrode active material layer 34a and other members, extending along the entire outer edges 38a, 38b of the upper negative electrode active material layer 34a. This suppresses damage to other members caused by the outer edges 38a, 38b of the upper negative electrode active material layer 34a. Specifically, in each of the four corner portions 36 formed on the outer edges 38a, 38b, the first upper protective member 50a extends along the two sides 38a, 38b defining that corner portion 36. With this structure, damage to other members is suppressed by the four corner portions 36 of the upper negative electrode active material layer 34a.

[0039] However, the first upper protective member 50a does not necessarily have to be annular. For example, the first upper protective member 50a can also be L-shaped. In this case, such as Figure 7B As shown, alternatively, the four first upper protective members 50a may be respectively disposed at one of the corresponding corners 36 of the four corners of the upper negative electrode active material layer 34a. Alternatively, for example, as... Figure 7C As shown, alternatively, the two first upper protective members 50a can be disposed at two diagonally opposite corners of the four corners 36 of the upper negative electrode active material layer 34a. Additionally, for example, as... Figure 7D As shown, alternatively, a first upper protective member 50a may be disposed at one of the four corners 36 of the upper negative electrode active material layer 34a. In either case, the first upper protective member 50a extends across at least one corner 36 of the upper negative electrode active material layer 34a, covering the two sides 38a, 38b that define that corner 36. Thus, by positioning the first upper protective member 50a between at least one corner 36 of the upper negative electrode active material layer 34a and other members, the other members are protected from the influence of at least one corner 36 of the upper negative electrode active material layer 34a.

[0040] The first lower protective member 50b is provided to protect other components such as the separator 40 from the influence of the lower negative electrode active material layer 34b of the negative electrode sheet 30. The first lower protective member 50b can be configured in the same way as the first upper protective member 50a described above, or it can be configured differently from the first upper protective member 50a. As an example, the first lower protective member 50b has an annular shape that extends integrally along the outer edge of the lower positive electrode active material layer 24b. That is, the first lower protective member 50b has a shape similar to... Figure 7A The first upper protective member 50a shown has the same structure. Alternatively, the first lower protective member 50b may also have... Figure 7B , Figure 7C , Figure 7D Other structures as shown. In this case, the first lower protective member 50b can extend across at least one corner of the lower negative electrode active material layer 34b, covering both sides defining that corner. This prevents at least one corner of the lower negative electrode active material layer 34b from causing damage to other components.

[0041] The second upper protective member 52a is provided to protect other components such as the separator 40 from the influence of the upper positive electrode active material layer 24a of the positive electrode sheet 20. The second upper protective member 52a can be configured in the same way as the first upper protective member 50a described above, or it can be configured differently from the first upper protective member 50a. As an example, in this embodiment, the second upper protective member 52a has an annular shape that extends integrally along the outer edge of the upper positive electrode active material layer 24a. That is, the second upper protective member 52a has a shape similar to... Figure 7A The first upper protective member 50a shown has the same structure. As another embodiment, the second upper protective member 52a may also have the same structure. Figure 7B , Figure 7C , Figure 7D Other structures are shown. In this case, the second upper protective member 52a can extend across at least one corner of the upper positive electrode active material layer 24a, covering both sides defining that corner. This prevents at least one corner of the upper positive electrode active material layer 24a from causing damage to other components.

[0042] The second lower protective member 52b is provided to protect other components such as the separator 40 from the influence of the lower positive electrode active material layer 24b of the positive electrode sheet 20. The second lower protective member 52b can be configured in the same way as the first upper protective member 50a described above, or it can be configured differently from the first upper protective member 50a. As an example, in this embodiment, the second lower protective member 52b has an annular shape that extends integrally along the outer edge of the lower positive electrode active material layer 24b. That is, the second lower protective member 52b has a shape similar to... Figure 7A The first upper protective member 50a shown has the same structure. As another embodiment, the second lower protective member 52b may also have the same structure. Figure 7B , Figure 7C , Figure 7D Other structures are shown. In this case, the second lower protective member 52b can extend across at least one corner of the lower positive electrode active material layer 24b, covering both sides defining that corner. This prevents at least one corner of the lower positive electrode active material layer 24b from causing damage to other components.

[0043] like Figure 6As shown, the size of the positive electrode 20 is smaller than the size of the negative electrode 30. Therefore, when viewed along the Z-direction, the outer edge of the positive electrode 20 is located further inward than the outer edge of the negative electrode 30. Furthermore, the sizes of the positive electrode active material layers 24a and 24b disposed on the positive electrode 20 are also smaller than the sizes of the negative electrode active material layers 34a and 34b disposed on the negative electrode 30. Therefore, when viewed along the Z-direction, the outer edges of the positive electrode active material layers 24a and 24b are located further inward than the outer edges of the negative electrode active material layers 34a and 34b. On the other hand, all the protective members 50a, 50b, 52a, and 52b are formed with the same dimensions as each other. That is, when viewed along the Z-direction, the positions of all the protective members 50a, 50b, 52a, and 52b are consistent with each other. Moreover, in the positive electrode 20, the size of the upper positive electrode active material layer 24a can be the same as or different from the size of the lower positive electrode active material layer 24b. Similarly, in the negative electrode sheet 30, the size of the upper negative electrode active material layer 34a can be the same as or different from the size of the lower negative electrode active material layer 34b.

[0044] As described above, when viewed along the Z-direction, the outer edges of the two positive electrode active material layers 24a and 24b are positioned differently from the outer edges of the negative electrode active material layers 34a and 34b. On the other hand, when viewed along the Z-direction, the positions of the first upper protective member 50a, the first lower protective member 50b, the second upper protective member 52a, and the second lower protective member 52b are aligned. That is, all the protective members 50a, 50b, 52a, and 52b are arranged in an overlapping manner along the Z-direction. With this structure, undesirable bending and wrinkling are suppressed in the current collector foils 22 and 32 and / or the separator 40.

[0045] like Figure 6 As shown, the thickness of the first upper protective member 50a is designed to not exceed the thickness of the upper positive electrode active material layer 24a. That is, the dimension A1 in the Z direction of the first upper protective member 50a is less than or equal to the dimension B1 in the Z direction of the upper positive electrode active material layer 24a. With this structure, gaps between the upper positive electrode active material layer 24a and the separator 40 in the Z direction are suppressed. Similarly, the dimension A2 in the Z direction of the first lower protective member 50b is less than or equal to the dimension B2 in the Z direction of the lower positive electrode active material layer 24b. The dimension A3 in the Z direction of the second upper protective member 52a is less than or equal to the dimension C1 in the Z direction of the upper negative electrode active material layer 34a. The dimension A4 in the Z direction of the second lower protective member 52b is less than or equal to the dimension D2 in the Z direction of the lower negative electrode active material layer 34b.

[0046] In the above embodiments, each of the electrode sheets 20 and 30 is provided with two corresponding protective components 50a, 50b, 52a, and 52b. This structure more reliably suppresses damage to other components caused by the electrode active material layers 24a, 24b, 34a, and 34b. However, it is sufficient to provide at least one protective component for at least one electrode sheet.

[0047] For example, such as Figure 3 , Figure 6 As shown, among the multiple electrode sheets 20 and 30, the negative electrode sheet 30 located at the upper end in the Z direction does not have a positive electrode sheet 20 opposite to the upper negative electrode active material layer 34a. Therefore, the upper negative electrode active material layer 34a of the upper negative electrode sheet 30 is highly likely to cause damage to external components. Therefore, a first upper protective member 50a can be provided for the upper negative electrode active material layer 34a of at least the upper negative electrode sheet 30 among the multiple electrode sheets 20 and 30. Similarly, among the multiple electrode sheets 20 and 30, the negative electrode sheet 30 located at the lower end in the Z direction does not have a positive electrode sheet 20 opposite to the lower negative electrode active material layer 34b. Therefore, a second lower protective member 52b can be provided for the lower negative electrode active material layer 34b of at least the lower negative electrode sheet 30 among the multiple electrode sheets 20 and 30. Furthermore, the electrode sheets located at the upper and / or lower ends of the multiple electrode sheets 20 and 30 can also be positive electrode sheets 20.

[0048] In this embodiment, the plurality of electrode sheets 20 and 30 have electrode active material layers 24a, 24b, 34a, and 34b on both sides of each sheet. However, as another embodiment, at least one of the plurality of electrode sheets 20 and 30 may have a single electrode active material layer on only one side of each sheet.

[0049] In the above embodiments, the multiple protective members 50a, 50b, 52a, and 52b are constructed from sheet members made of the same material as the diaphragm 40. However, the structure of the protective members 50a, 50b, 52a, and 52b is not particularly limited. As another embodiment, the protective members 50a, 50b, 52a, and 52b may also be constructed from a different material than the diaphragm 40. For example, the protective members 50a, 50b, 52a, and 52b may be made of a metallic material or a resin material. As an example, insulating materials such as polypropylene and polyethylene can be cited as resin materials. The protective members 50a, 50b, 52a, and 52b can be rigid members or flexible members (e.g., elastomers, foams). Furthermore, the protective members 50a, 50b, 52a, and 52b may also have a more rounded outer edge at the corner 36 of the electrode active material layers 24a, 24b, 34a, and 34b than the corner 36 itself. Thus, the corners of the protective components 50a, 50b, 52a, 52b and the electrode active material layers 24a, 24b, 34a, 34b can be appropriately designed in terms of material and / or shape, as long as they do not easily damage other components.

[0050] In the above embodiment, multiple protective members 50a, 50b, 52a, and 52b are disposed on the diaphragm 40. However, in other embodiments, such as Figure 8 As shown, multiple protective components 50a, 50b, 52a, and 52b can also be disposed on the current-collecting foils 22 and 32 of the corresponding electrode sheets 20 and 30. With this structure, the protective components 50a, 50b, 52a, and 52b can also be positioned between the corners 36 of the electrode active material layers 24a, 24b, 34a, and 34b and other components.

[0051] In the above embodiment, the outer edges of each of the electrode active material layers 24a, 24b, 34a, and 34b have a rectangular shape with four corners 36 when viewed along the Z direction. However, the outer edges of each of the electrode active material layers 24a, 24b, 34a, and 34b only need to have a shape with at least one corner when viewed along the Z direction. In this case, at least one protective member can extend across the two sides defining the corner at at least one corner.

[0052] The above provides detailed examples, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes technologies obtained by various modifications and alterations to the above-described examples. The technical elements illustrated in this specification or drawings contribute to the technical usefulness of the technology, either individually or in combination.

Claims

1. An electrode laminate comprising: Multiple electrode sheets stacked along a first direction; and A long diaphragm extending in a tortuous manner between the plurality of electrode sheets, The plurality of electrode sheets each have a current-collecting foil and an electrode active material layer disposed on one surface of the current-collecting foil. In at least one of the plurality of electrode sheets, at least one protective member extending along the outer edge of the electrode active material layer is disposed on at least one of the electrode sheet and the diaphragm. The outer edge of the electrode active material layer has a shape having at least one corner. The at least one protective member extends across the two sides defining the corner in any one of the at least one corners.

2. The electrode laminate according to claim 1, wherein, The outer edge of the electrode active material layer has a rectangular shape with four corners. The at least one protective member includes four protective members respectively disposed at the four corners.

3. The electrode laminate according to claim 1, wherein, The at least one protective member includes an annular protective member that extends integrally along the outer edge of the electrode active material layer.

4. The electrode laminate according to claim 1, wherein, The plurality of electrode plates includes a first electrode plate and a second electrode plate. The first electrode sheet has a first electrode active material layer as the electrode active material layer. The second electrode sheet has a second electrode active material layer that is opposed to the first electrode active material layer through the diaphragm, serving as the electrode active material layer. At least one of the first electrode sheet and the diaphragm is provided with at least one first protective member extending along the outer edge of the active material layer of the first electrode. At least one of the second electrode sheet and the diaphragm is provided with at least one second protective member extending along the outer edge of the active material layer of the second electrode. When viewed along the first direction, the position of the outer edge of the first electrode active material layer is different from the position of the outer edge of the second electrode active material layer. On the other hand, the position of the at least one first protective member is consistent with the position of the at least one second protective member.

5. The electrode laminate according to claim 1, wherein, The at least one protective member is disposed relative to the electrode active material layer of the electrode sheet at least at one end in the first direction among the plurality of electrode sheets.

6. The electrode laminate according to claim 1, wherein, The at least one protective member is respectively disposed relative to the plurality of electrode plates.

7. The electrode laminate according to claim 1, wherein, The at least one protective member is constituted by a sheet member made of the same material as the diaphragm.

8. The electrode laminate according to claim 1, wherein, The at least one protective member is composed of a component different from the diaphragm.

9. The electrode laminate according to claim 1, wherein, The dimension of the at least one protective member in the first direction is less than or equal to the dimension of the electrode active material layer of at least one of the plurality of electrode sheets in the first direction.

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