Electrode member

Abstract

A first current collector (electrode member) is provided with an insulating substrate and a first conductive layer provided on the surface of the insulating substrate. A plurality of fillers for reducing the difference between the linear expansion coefficients of the insulating substrate and the first conductive layer are dispersed inside the insulating substrate. The difference between the linear expansion coefficient of the insulating substrate in which the plurality of fillers are dispersed and the linear expansion coefficient of the first conductive layer is within + / -20% of the linear expansion coefficient of the first conductive layer.

Description

Technical Field

[0001] This disclosure relates to electrode components. Background Technology

[0002] Japanese Patent Application Publication No. 2019-96592 discloses an electrode component having an insulating substrate and a conductive layer disposed on the surface of the insulating substrate. Summary of the Invention

[0003] Under temperature variations in such electrode components, the conductive layer can easily peel off from the insulating substrate.

[0004] One object of this disclosure is to suppress the stripping of the conductive layer in the electrode component.

[0005] One aspect of the electrode component disclosed herein includes an insulating substrate and a conductive layer disposed on the surface of the insulating substrate. A plurality of fillers are dispersed within the insulating substrate to mitigate the difference in linear expansion coefficients between the insulating substrate and the conductive layer. The difference between the linear expansion coefficient of the insulating substrate to which the plurality of fillers are dispersed and the linear expansion coefficient of the conductive layer is within ±20% of the linear expansion coefficient of the conductive layer.

[0006] Preferably, multiple fillers are made of glass fiber.

[0007] Preferably, the insulating matrix includes a main body for stacking active material layers and protruding tabs connected to the main body and projecting outward from the main body. Multiple fillers have an elongated shape. In the protruding tabs, the length direction of the multiple fillers is parallel to the protrusion direction of the protruding tabs.

[0008] Preferably, the insulating matrix includes a main body for stacking active material layers and protruding tabs connected to the main body and projecting outward from the main body. Multiple fillers have an elongated shape. In the protruding tabs, the length direction of the multiple fillers intersects the protruding direction of the protruding tabs.

[0009] Preferably, the insulating matrix includes a main body portion for stacking active material layers and protruding tabs connected to the main body portion and protruding outward from the main body portion. Multiple fillers have elongated shapes. In a wound body formed by winding the insulating matrix, the length direction of the multiple fillers disposed in the main body portion is along the winding direction of the insulating matrix.

[0010] According to this disclosure, it is possible to suppress the peeling of the conductive layer in the electrode component. Attached Figure Description

[0011] 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:

[0012] Figure 1 This is a perspective view showing a battery including the electrode components of this embodiment;

[0013] Figure 2 Observe from the direction of the arrow on line II-II Figure 1 A cross-sectional view obtained from the electrode body 10 shown;

[0014] Figure 3 Observe from the direction of the arrow on line III-III Figure 1 A cross-sectional view obtained from the electrode body 10 shown;

[0015] Figure 4 It is Figure 3 A magnified partial cross-sectional view of region IV of the first electrode;

[0016] Figure 5 yes Figure 4 The developed view of the insulating substrate 110 shown; and

[0017] Figure 6 This is a development diagram of the insulating substrate in the modified example. Detailed Implementation

[0018] Hereinafter, embodiments and variations of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, identical or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated.

[0019] Implementation

[0020] Figure 1 This is a perspective view showing a battery including the electrode components of this embodiment. Figure 1 As shown, the battery 1, which includes the electrode components in this embodiment, is a so-called prismatic battery. Battery 1 can be a lithium-ion battery, a nickel-metal hydride battery, or the like, configured as a rechargeable secondary battery. Battery 1 can, for example, be used as a single cell included in an energy storage module mounted in an electrified vehicle.

[0021] Battery 1 includes an electrode body 10, a housing 20, a first external terminal 30A, a second external terminal 30B, a first connecting member (not shown), a second connecting member (not shown), and an insulating member (not shown). First, the components of battery 1 other than the electrode body 10 will be described.

[0022] The housing 20 is conductive. The conductive parts of the housing 20 are made of a metal such as aluminum. The housing 20 houses the electrode body 10. The housing 20 also houses the electrolyte (not shown).

[0023] The housing 20 includes a housing body 21 and a cover 22. The housing body 21 includes a bottom wall 21a and a peripheral wall 21b rising from the bottom wall 21a.

[0024] A pressure relief valve (not shown) is provided on the bottom wall 21a. The bottom wall 21a and the pressure relief valve are made of metals such as aluminum.

[0025] An opening is formed at the upper end of the peripheral wall 21b. The peripheral wall 21b has a generally rectangular shape when viewed from the opening direction. The opening and the bottom wall 21a are aligned in a first direction D1. The first direction D1 can be the height direction of the battery 1 or the vertical direction. In this embodiment, the direction from the bottom wall 21a towards the cover 22 is referred to as "upper," and the direction from the cover 22 towards the bottom wall 21a is referred to as "lower." The peripheral wall 21b is made of a metal such as aluminum.

[0026] The cover 22 includes a cover body 22a and an insulating cover 22d. The cover body 22a is joined to the peripheral wall 21b by welding or the like to close the opening of the peripheral wall 21b. An injection hole (not shown) is formed in the cover body 22a. This injection hole is a through hole for injecting electrolyte into the casing body 21 during the manufacturing process of the battery 1. The injection hole is sealed by a sealing plug. The insulating cover 22d covers the injection hole and the sealing plug.

[0027] The cover 22 is provided with a first external terminal 30A and a second external terminal 30B. The first external terminal 30A and the second external terminal 30B are arranged in such a way that they are exposed to the outside in the battery 1.

[0028] The first external terminal 30A is electrically connected to the electrode body 10 via the first connecting member. More specifically, the first external terminal 30A and the first connecting member are engaged with each other. The first connecting member is engaged with a plurality of tabs 150A of the electrode body 10.

[0029] The second external terminal 30B is electrically connected to the electrode body 10 via the second connecting member. More specifically, the second external terminal 30B and the second connecting member are engaged with each other. The second connecting member is engaged with a plurality of tabs 150B of the electrode body 10.

[0030] In this embodiment, the first external terminal 30A is the positive terminal and the second external terminal 30B is the negative terminal. The first external terminal 30A and the second external terminal 30B are arranged in the second direction D2. The second direction D2 is orthogonal to the first direction D1.

[0031] The insulating component is electrically insulating. The insulating component is disposed between the electrode body 10 and the housing 20. The insulating component electrically insulates the electrode body 10 and the housing 20 from each other.

[0032] like Figure 1As shown, the battery 1 of this embodiment includes a plurality of electrode bodies 10. The battery 1 typically includes two electrode bodies 10. These electrode bodies 10 are arranged in a third direction D3. The third direction D3 is a direction orthogonal to both the first direction D1 and the second direction D2.

[0033] The following description focuses on one of the plurality of electrode bodies 10. It should be noted that each of the plurality of electrode bodies 10 may have the configuration shown below.

[0034] Figure 2 It is observed along the direction of the arrow on line II-II. Figure 1 The cross-sectional view obtained from the electrode body 10 shown. Figure 3 It is observed along the direction of the arrow on line III-III. Figure 1 A cross-sectional view obtained from the electrode body 10 shown. (Refer to...) Figure 2 and Figure 3 The electrode body 10 includes a first electrode 11A, a second electrode 11B, a separator 12, and a strip member 13. The electrode body 10 is wound such that the first electrode 11A, the second electrode 11B, and the separator 12 surround the winding axis Z. Thus, in this embodiment, the electrode body 10 is a so-called wound electrode body. However, the electrode body 10 may also be a stacked electrode body in which the first electrode 11A, the second electrode 11B, and the separator 12 are stacked in one direction (e.g., a third direction D3). It should be noted that in... Figure 2 and Figure 3 In the middle, the separator 12 is schematically represented by a dashed line.

[0035] The first electrode 11A and the second electrode 11B have a sheet-like shape. The electrode body 10 is composed of a group of electrode plates formed by winding the first electrode 11A and the second electrode 11B with one or more separators 12 sandwiched in between.

[0036] In this embodiment, the first electrode 11A is the positive electrode and the second electrode 11B is the negative electrode. However, it is also possible that the first electrode 11A is the negative electrode and the second electrode 11B is the positive electrode.

[0037] The first electrode 11A includes a first current collector 100A and a first active material layer 200A. The first current collector 100A is an example of an "electrode component" in this disclosure. The first active material layer 200A is an example of an "active material layer" in this disclosure. The first active material layer 200A includes an inner active material layer 210A and an outer active material layer 220A. The second electrode 11B includes a second current collector 100B and a second active material layer 200B. The first active material layer 200A is a positive active material layer, and the second active material layer 200B is a negative active material layer. However, it is also possible that the first active material layer 200A is a negative active material layer, and the second active material layer 200B is a positive active material layer.

[0038] A separator 12 is disposed between the first electrode 11A and the second electrode 11B. The separator 12 is stacked radially on the first active material layer 200A with the winding axis Z as the center. The separator 12 is also stacked radially on the inner active material layer 210A. The separator 12 is also stacked radially on the outer active material layer 220A.

[0039] The second electrode 11B is laminated to the first active material layer 200A in the aforementioned radial direction, with the spacer 12 sandwiched in the middle. More specifically, the second electrode 11B is laminated to the inner active material layer 210A with the spacer 12 sandwiched in the middle, and also to the outer active material layer 220A with the spacer 12 sandwiched in the middle.

[0040] The separator 12 allows ions to move between the first electrode 11A and the second electrode 11B, and separates the first electrode 11A and the second electrode 11B. The ions are, for example, lithium ions. The separator 12 is electrically insulating.

[0041] Of the first electrode 11A, the second electrode 11B, and the separator 12, the separator 12 is located on the innermost circumferential side centered on the winding axis Z. Conversely, of the first electrode 11A, the second electrode 11B, and the separator 12, the separator 12 is located on the outermost circumferential side centered on the winding axis Z. The outer circumferential edge of the separator 12 in the winding direction DR is fixed by a strip member 13 disposed on the outer circumferential surface of the separator 12.

[0042] The separator 12 may, for example, comprise a polyolefin resin. The separator 12 may, for example, be substantially composed of a polyolefin resin. The polyolefin resin may, for example, comprise at least one selected from polyethylene (PE) and polypropylene (PP).

[0043] Reference Figure 4 and Figure 5 The detailed structure of the first electrode 11A will be explained. Figure 4 It is an enlarged representation Figure 3 A partial cross-sectional view of region IV of the first electrode. The first electrode 11A includes a first current collector 100A, a first active material layer 200A, and a protective portion 300.

[0044] The first current collector 100A includes an insulating substrate 110, a first conductive layer 120, a second conductive layer 130, and a tab 150A. The first conductive layer 120 and the second conductive layer 130 are examples of "conductive layers" in this disclosure.

[0045] The insulating substrate 110 is composed of an electrically insulating resin composition. Therefore, the first current collector 100A is a composite current collector composed of conductive and electrically insulating components. Furthermore, the insulating substrate 110 is provided with a rigidity ratio separator 12 (see reference 12). Figure 2 The insulating substrate 110 is made of a high-strength material. For example, it is composed of a resin composition including polyamide resin, polyester resin (e.g., polyethylene terephthalate), polyolefin resin (e.g., polypropylene), polyethylene, PEEK, polycarbonate, or ABS. This allows for maintaining the electrical insulation properties of the insulating substrate 110 while improving the rigidity of the first current collector 100A. Furthermore, it enables the insulating substrate 110 to be relatively thin.

[0046] The thickness direction DT of the insulating substrate 110 is substantially parallel to the third direction D3. The orthogonal direction DO, which is orthogonal to the thickness direction DT of the insulating substrate 110, is substantially parallel to the first direction D1. The insulating substrate 110 extends substantially parallel to the first direction D1. The insulating substrate 110 includes a first surface 111 and a second surface 112 disposed at a distance from each other in the thickness direction DT. A first conductive layer 120 is provided on the first surface 111, and a second conductive layer 130 is provided on the second surface 112.

[0047] To reduce the overall thickness of the electrode body 10, the thickness of the insulating substrate 110 is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. The thickness of the insulating substrate 110 is not particularly limited as long as it possesses the desired rigidity. For example, a thickness of 2 μm or more is acceptable.

[0048] The insulating substrate 110 includes a main body portion 118 for stacking the first active material layer 200A and a protruding tab portion 119 connected to the main body portion 118 and protruding outward from the main body portion 118. The protrusion direction DP of the protruding tab portion 119 is along the orthogonal direction DO. The protruding tab portion 119 protrudes upward from the upper side of the main body portion 118 along the orthogonal direction DO. That is, the protruding tab portion 119 protrudes upward from the upper side of the main body portion 118 along the first direction D1.

[0049] Here, refer to Figure 5 Further details on the insulating substrate 110. Figure 5 yes Figure 4 The diagram shows the unfolded view of the insulating substrate 110. Figure 5 The image shows the state of the insulating substrate 110 before it is wound. The insulating substrate 110 has a sheet-like shape.

[0050] The insulating substrate 110 contains a lightening layer 120 (see reference). Figure 4The difference between the linear expansion coefficients of the insulating substrate 110, to which the multiple fillers 180 are dispersed, and the linear expansion coefficient of the first conductive layer 120 is within ±20% of the linear expansion coefficient of the first conductive layer 120. By ensuring that the difference between the linear expansion coefficient of the insulating substrate 110, to which the multiple fillers 180 are dispersed, and the linear expansion coefficient of the first conductive layer 120 is within ±20% of the linear expansion coefficient of the first conductive layer 120, the first current collector 100A (refer to...) can be suppressed. Figure 4 The first conductive layer 120 in the ) is stripped.

[0051] The difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the first conductive layer 120 is preferably within ±10% of the coefficient of linear expansion of the first conductive layer 120. Electrode body 10 (refer to...) Figure 1 The central portion in the first direction D1 of the electrode body 10 is more prone to high temperature than the end portion in the first direction D1 of the electrode body 10. By making the difference between the coefficient of linear expansion of the insulating substrate 110, in which a plurality of fillers 180 are dispersed, and the coefficient of linear expansion of the first conductive layer 120 within ±10% of the coefficient of linear expansion of the first conductive layer 120, peeling of the first conductive layer 120 can be suppressed in the central portion (i.e., the high-temperature portion) in the first direction D1 of the electrode body 10.

[0052] The difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the first conductive layer 120 is more preferably within ±5% of the coefficient of linear expansion of the first conductive layer 120. From the electrode body 10 (refer to...) Figure 2 When viewing the electrode body 10 from above, the electrode body 10 has arcuate portions E1 and E2 arranged at intervals in the second direction D2 (refer to...). Figure 2 ) and flat portions H1 and H2 arranged at intervals in the third direction D3 (refer to Figure 2 By ensuring that the difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the first conductive layer 120 is within ±5% of the coefficient of linear expansion of the first conductive layer 120, peeling of the first conductive layer 120 can be suppressed in the arc portions E1 and E2.

[0053] Multiple fillers 180 reduce the impact between the insulating substrate 110 and the second conductive layer 130 (see reference). Figure 4 The difference in the coefficients of linear expansion between the insulating substrate 110, to which multiple fillers 180 are dispersed, and the coefficient of linear expansion between the second conductive layer 130 and the first conductive layer 130 is within ±20% of the coefficient of linear expansion of the second conductive layer 130. By ensuring that the difference in the coefficient of linear expansion between the insulating substrate 110, to which multiple fillers 180 are dispersed, and the coefficient of linear expansion between the second conductive layer 130 is within ±20% of the coefficient of linear expansion of the second conductive layer 130, the first current collector 100A (refer to...) can be suppressed. Figure 4 The second conductive layer 130 in the ) is stripped.

[0054] The difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the second conductive layer 130 is preferably within ±10% of the coefficient of linear expansion of the second conductive layer 130. By ensuring that the difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the second conductive layer 130 is within ±10% of the coefficient of linear expansion of the second conductive layer 130, the electrode body 10 (refer to...) Figure 1 The central portion (i.e., the high-temperature portion) on the first direction D1 in the ) can suppress the peeling of the second conductive layer 130.

[0055] The difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the second conductive layer 130 is more preferably within ±5% of the coefficient of linear expansion of the second conductive layer 130. By ensuring that the difference between the coefficient of linear expansion of the insulating substrate 110, in which multiple fillers 180 are dispersed, and the coefficient of linear expansion of the second conductive layer 130 is within ±5% of the coefficient of linear expansion of the second conductive layer 130, the linear expansion of the arc portions E1 and E2 (refer to...) is more favorable. Figure 2 This can suppress the peeling of the second conductive layer 130.

[0056] In this embodiment, multiple fillers 180 reduce the difference in linear expansion coefficients between the insulating substrate 110 and the first conductive layer 120 and the second conductive layer 130. However, multiple fillers 180 can also reduce the difference in linear expansion coefficients between the insulating substrate 110 and at least one of the first conductive layer 120 and the second conductive layer 130.

[0057] The fillers 180 are, for example, glass fibers. By making the fillers 180 glass fibers, the coefficient of linear expansion of the insulating matrix 110 can be more appropriately controlled.

[0058] Furthermore, the multiple fillers 180 may also be conductive. When the insulating matrix 110 is composed of a resin composition containing polyethylene terephthalate, the multiple fillers 180 may, for example, be aluminum. When the multiple fillers 180 are conductive, the first current collector 100A (see reference) can be reduced. Figure 4 The resistance of ).

[0059] Multiple fillers 180 have an elongated shape. In the protruding tab 119, the length direction DQ of the multiple fillers 180 is parallel to the protrusion direction DP of the protruding tab 119. That is, the length direction DQ of the multiple fillers 180 is parallel to the orthogonal direction DO. In addition, the length direction DQ of the multiple fillers 180 is approximately parallel to the first direction D1. By making the length direction DQ of the multiple fillers 180 parallel to the protrusion direction DP of the protruding tab 119, breakage of the protruding tab 119 in a direction intersecting the protrusion direction DP (e.g., the winding direction DR of the insulating substrate 110) can be suppressed.

[0060] In the main body 118, the longitudinal direction DQ of the plurality of fillers 180 is also parallel to the protruding direction DP of the protruding sheet portion 119. Furthermore, in a wound body formed by winding the insulating substrate 110, the longitudinal direction DQ of the plurality of fillers 180 disposed in the main body 118 can also be along the winding direction DR of the insulating substrate 110. Generally, resin compositions are prone to shrinkage due to heat. However, by aligning the longitudinal direction DQ of the plurality of fillers 180 disposed in the main body 118 along the winding direction DR of the insulating substrate 110, the insulating substrate 110 is positioned relative to the first conductive layer 120 and the second conductive layer 130 (see reference 110). Figure 4 Each is difficult to shrink.

[0061] Refer again Figure 4 A first conductive layer 120 is stacked on the first surface 111 of the insulating substrate 110. The first conductive layer 120 is in contact with the insulating substrate 110 on one side in the thickness direction DT. In this embodiment, when viewed from the insulating substrate 110, the first conductive layer 120 is located at the winding axis Z (refer to...). Figure 3 The first conductive layer 120 is in contact with the insulating substrate 110 on one side of the thickness direction DT.

[0062] The second conductive layer 130 is stacked on the second surface 112 of the insulating substrate 110. The second conductive layer 130 is in contact with the insulating substrate 110 on the other side in the thickness direction DT. In this embodiment, when viewed from the insulating substrate 110, the second conductive layer 130 is located relative to the winding axis Z (refer to...). Figure 3 On the opposite side of the first conductive layer 130, the second conductive layer 130 is in contact with the insulating substrate 110 on the other side of the thickness direction DT.

[0063] The first conductive layer 120 and the second conductive layer 130 are each made of metal. In this embodiment, the first conductive layer 120 and the second conductive layer 130 are made of a metal containing aluminum. Therefore, the first current collector 100A can be suitable as a positive current collector. Alternatively, the first current collector 100A can also be a negative current collector, and the first conductive layer 120 and the second conductive layer 130 can also be made of a metal containing copper.

[0064] The thicknesses of the first conductive layer 120 and the second conductive layer 130 are each thinner than the thickness of the insulating substrate 110. This is to ensure that the electrode body 10 (refer to...) Figure 2 The overall thickness of the conductive layer 120 and the second conductive layer 130 is reduced, and the thickness of each of them is, for example, 5 μm or less, more preferably 2 μm or less, and even more preferably 1 μm or less. In order to suppress the resistance of each of the first conductive layer 120 and the second conductive layer 130 from becoming too high, the thickness of each of them is, for example, 0.1 μm or more.

[0065] The first conductive layer 120 and the second conductive layer 130 are provided, for example, by vapor deposition of an aluminum-containing metal onto the insulating substrate 110. The first conductive layer 120 and the second conductive layer 130 may also be film-like components bonded to the insulating substrate 110.

[0066] The tab 150A is bonded to the first conductive layer 120 and the second conductive layer 130, for example, by ultrasonic welding. The tab 150A extends from the insulating substrate 110 toward the battery 1 (see reference). Figure 1 The tab 150A extends upwards. The extension direction of the tab 150A is along the orthogonal direction DO.

[0067] The tab 150A is joined to the first connecting structure described above, for example, by ultrasonic welding. The tab 150A includes a first foil portion 151 and a second foil portion 152. Viewed from the first conductive layer 120, the first foil portion 151 is located on the side opposite to the insulating substrate 110. The first foil portion 151 is joined to the first conductive layer 120. The first foil portion 151 and the first conductive layer 120 are joined together, for example, by ultrasonic welding. Viewed from the second conductive layer 130, the second foil portion 152 is located on the side opposite to the insulating substrate 110. The second foil portion 152 is joined to the second conductive layer 130. The second foil portion 152 and the second conductive layer 130 are joined together, for example, by ultrasonic welding. Viewed from the protruding tab portion 119, on the side opposite to the main body portion 118, the second foil portion 152 is joined to the first foil portion 151. The first foil portion 151 and the second foil portion 152 are joined together, for example, by ultrasonic welding.

[0068] Furthermore, in this embodiment, the length of the first foil portion 151 in the orthogonal direction DO, which is orthogonal to the thickness direction DT, is longer than the length of the second foil portion 152 in the orthogonal direction DO. Also, the first foil portion 151 is engaged with the aforementioned first connecting member, while the second foil portion 152 is not engaged with the aforementioned first connecting member. However, the shape of the tab 150A is not limited to this. Either the first foil portion 151 or the second foil portion 152 may be engaged with the first connecting member. The length of the second foil portion 152 in the orthogonal direction DO may also be longer than the length of the first foil portion 151 in the orthogonal direction DO.

[0069] A first active material layer 200A is stacked on a first conductive layer 120. The first active material layer 200A is a positive electrode active material layer. In this embodiment, the first active material layer 200A is also stacked on a second conductive layer 130. The first active material layer 200A includes an inner active material layer 210A and an outer active material layer 220A. The inner active material layer 210A is stacked on the first conductive layer 120. The outer active material layer 220A is stacked on the second conductive layer 130.

[0070] The upper edge of the first active material layer 200A is isolated from the tab 150A. More specifically, the upper edge of the inner active material layer 210A is isolated from the first foil portion 151. The upper edge of the outer active material layer 220A is isolated from the second foil portion 152.

[0071] The protective portion 300 is electrically insulating, for example, made of ceramic. The protective portion 300 covers the upper part of the first active material layer 200A. The protective portion 300 further covers the first current collector 100A between the tab 150A and the first active material layer 200A.

[0072] The protective portion 300 includes an inner protective portion 310 and an outer protective portion 320. The inner protective portion 310 covers the upper part of the inner active material layer 210A. The inner protective portion 310 covers a first conductive layer 120 between the first foil portion 151 and the inner active material layer 210A. The outer protective portion 320 covers the upper part of the outer active material layer 220A. The outer protective portion 320 covers a second conductive layer 130 between the second foil portion 152 and the outer active material layer 220A.

[0073] Thus, the first current collector 100A (electrode member) in this embodiment includes an insulating substrate 110 and a conductive layer (e.g., a first conductive layer 120) disposed on the surface of the insulating substrate 110. A plurality of fillers 180 are dispersed within the insulating substrate 110 to reduce the difference in linear expansion coefficients between the insulating substrate 110 and the conductive layer. The difference between the linear expansion coefficient of the insulating substrate 110, to which the plurality of fillers 180 are dispersed, and the linear expansion coefficient of the conductive layer is within ±20% of the linear expansion coefficient of the conductive layer. Therefore, the difference in linear expansion coefficients between the insulating substrate 110 and the conductive layer is reduced. Thus, the first current collector 100A (electrode member) in this embodiment can suppress the peeling of the conductive layer in the electrode member.

[0074] Furthermore, in this embodiment, the plurality of fillers 180 are glass fibers. Therefore, the coefficient of linear expansion of the insulating matrix 110 can be more appropriately controlled by the first current collector 100A (electrode member) in this embodiment.

[0075] Furthermore, in this embodiment, in the protruding piece 119, the longitudinal direction DQ of the plurality of fillers 180 is parallel to the protruding direction DP of the protruding piece 119. Therefore, by means of the first current collector 100A (electrode member) in this embodiment, it is possible to suppress the protruding piece 119 from breaking in a direction that intersects with the protruding direction DP (e.g., the winding direction DR of the insulating substrate 110).

[0076] Variations

[0077] Reference Figure 6 The insulating substrate in the modified example will be explained. Figure 6 This is a development diagram of the insulating substrate in the modified example. Figure 6 The image shows the state of the insulating substrate 110A in a modified example before it is wound. The insulating substrate 110A is similar to the aforementioned insulating substrate 110 (see reference...). Figure 5 The difference lies in the orientation of the multiple packings at 180 degrees.

[0078] More specifically, in the protruding tab 119 of the insulating substrate 110A, the longitudinal direction DQ of the plurality of fillers 180 intersects the protruding direction DP of the protruding tab 119 of the insulating substrate 110A. In the main body 118 of the insulating substrate 110A, the longitudinal direction DQ of the plurality of fillers 180 also intersects the protruding direction DP of the protruding tab 119. More specifically, in the wound body formed by winding the insulating substrate 110A, the longitudinal direction DQ of the plurality of fillers 180 disposed in the main body 118 of the insulating substrate 110A is along the winding direction DR of the insulating substrate 110A. In other respects, the insulating substrate 110A is the same as the insulating substrate 110.

[0079] In the protruding piece 119, the longitudinal direction DQ of the plurality of fillers 180 intersects the protruding direction DP of the protruding piece 119, thereby suppressing the protruding piece 119 from breaking in the protruding direction DP. Additionally, in the first current collector 100A (refer to...) Figure 4 In the case where an insulating substrate 110A is used instead of an insulating substrate 110, the longitudinal direction DQ of the plurality of fillers 180 provided on the main body 118 is along the winding direction DR of the insulating substrate 110A. Therefore, the insulating substrate 110A is relative to the first conductive layer 120 and the second conductive layer 130 (see reference). Figure 4 Each is difficult to shrink.

[0080] Furthermore, in the main body 118 of the insulating substrate 110A, the longitudinal direction DQ of the plurality of fillers 180 may also be parallel to the protruding direction DP of the protruding sheet portion 119.

[0081] The embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of this disclosure is not shown by the foregoing description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. An electrode component comprising: Insulating substrate; and A conductive layer is disposed on the surface of the insulating substrate. Multiple fillers are dispersed within the insulating substrate to reduce the difference in the coefficients of linear expansion between the insulating substrate and the conductive layer. The difference between the coefficient of linear expansion of the insulating substrate in which the plurality of fillers are dispersed and the coefficient of linear expansion of the conductive layer is within ±20% of the coefficient of linear expansion of the conductive layer.

2. The electrode component according to claim 1, The multiple fillers are glass fibers.

3. The electrode component according to claim 1, The insulating substrate includes a main body portion for stacking active material layers and a protruding sheet portion connected to the main body portion and protruding outward from the main body portion. The plurality of packing materials have an elongated shape. In the protruding portion, the length direction of the plurality of fillers is parallel to the protruding direction of the protruding portion.

4. The electrode component according to claim 1, The insulating substrate includes a main body portion for stacking active material layers and a protruding sheet portion connected to the main body portion and protruding outward from the main body portion. The plurality of packing materials have an elongated shape. In the protruding portion, the length direction of the plurality of fillers intersects the protruding direction of the protruding portion.

5. The electrode component according to claim 1, The insulating substrate includes a main body portion for stacking active material layers and a protruding sheet portion connected to the main body portion and protruding outward from the main body portion. The plurality of packing materials have an elongated shape. In the wound body formed by winding the insulating substrate, the length direction of the plurality of fillers disposed in the main body is along the winding direction of the insulating substrate.

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