Electrode component

Abstract

The present invention provides an electrode member capable of suppressing the occurrence of wrinkles and bending in uncoated areas where the active material layer is not applied. [Solution] The electrode member 11A comprises a base material 100A including a resin base material 110 and a conductive layer formed on the resin base material 110, and an active material layer formed on the conductive layer. The base material 100A has a coated region R1 on which the active material layer is coated and an uncoated region R2 on which the active material layer is not coated. The resin base material 110 is made of a crystalline polymer. The crystallinity of the crystalline polymer located in the coated region R1 is greater than the crystallinity of the crystalline polymer located in the uncoated region R2.

Description

【Technical Field】 【0001】 This disclosure relates to an electrode member. 【Background Art】 【0002】 As a conventional electrode body, in Japanese Patent Application Laid-Open No. 2019-096592 (Patent Document 1), an electrode member in which a conductive layer and an active material layer are laminated in this order on the surface of an insulating substrate is used for at least one of a sheet-like positive electrode member and a negative electrode member, and a separator is disposed between the positive electrode member and the negative electrode member and these are wound, and a structure is disclosed. The conductive layer includes a first portion coated with the active material layer and a second portion protruding from the first portion, and through holes penetrating in the thickness direction are provided in the second portion and a portion of the insulating substrate corresponding to the second portion. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-096592 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the manufacturing process of an electrode member, in order to fix an active material layer coated on a substrate, there is a pressing process in which the active material layer and the substrate are sandwiched between rollers and pressed. An uncoated area where the active material layer is not coated is formed on the substrate, and in the pressing process, the roller contacts the active material layer and does not contact the uncoated area. For this reason, in the substrate, the coated area coated with the active material layer extends due to pressing, but the uncoated area is difficult to extend, and a difference in extension may occur between the coated area and the uncoated area. When using a substrate including a resin member, due to the above-described difference in extension, there is concern that the uncoated area may be curved or wrinkles may occur in the uncoated area. 【0005】 This disclosure has been made in view of the above-mentioned problems, and the purpose of this disclosure is to provide an electrode member that can suppress the occurrence of wrinkles and bending in uncoated areas where the active material layer is not coated. [Means for solving the problem] 【0006】 An electrode member according to this disclosure comprises a substrate including a resin substrate and a conductive layer formed on the resin substrate, and an active material layer formed on the conductive layer. The substrate has a coated region to which the active material layer is applied and an uncoated region to which the active material layer is not applied. The resin substrate is composed of a crystalline polymer. The crystallinity of the crystalline polymer located in the coated region is greater than the crystallinity of the crystalline polymer located in the uncoated region. 【0007】 Generally, in the manufacturing of electrode components, there is a pressing process in which the active material layer and the substrate are sandwiched between a pair of rollers and pressed to fix the active material layer onto the substrate. In the pressing process, the coated area of ​​the substrate coated with the active material layer is easily stretched because it is sandwiched between the pair of rollers. On the other hand, the uncoated area of ​​the substrate where the active material layer has not been formed is not easily stretched because it is not sandwiched between the pair of rollers. 【0008】 In the above configuration, the high crystallinity of the resin substrate suppresses elongation in the easily stretchable coated area. Furthermore, in the pressing process, the low crystallinity of the resin substrate promotes elongation in the less stretchable uncoated area. As a result, the difference in elongation between the uncoated and coated areas can be reduced. Consequently, the occurrence of wrinkles and deformation into curved shapes in the less stretchable areas where the active material layer is not formed can be suppressed. 【0009】 In the electrode member based on the above disclosure, the crystalline polymer may be polypropylene. 【0010】 Because polypropylene is a less elongated material compared to polyethylene and other materials, using polypropylene as the resin substrate can further reduce the difference in elongation between the coated and uncoated areas of the resin substrate. [Effects of the Invention] 【0011】 According to this disclosure, it is possible to provide an electrode member that can suppress the occurrence of wrinkles and bending in uncoated areas where the active material layer is not applied. [Brief explanation of the drawing] 【0012】 [Figure 1] This is a perspective view of the battery according to Embodiment 1. [Figure 2] This is a disassembled perspective view of the battery according to Embodiment 1. [Figure 3] Figure 1 is a cross-sectional view of the battery as seen in the direction of the arrow III-III. [Figure 4] Figure 3 is a cross-sectional view of the electrode body as seen in the direction of the IV-IV line arrow. [Figure 5] This is a cross-sectional view of the first electrode member according to Embodiment 1 in an unfolded state. [Figure 6] This is a cross-sectional view of the second electrode member according to deformation example 1 in an unfolded state. [Modes for carrying out the invention] 【0013】 Embodiment 1 of this disclosure will be described in detail below with reference to the figures. In Embodiment 1 described below, the same or common parts are denoted by the same reference numerals in the figures, and their descriptions will not be repeated. 【0014】 (Embodiment 1) Figure 1 is a perspective view showing a battery according to Embodiment 1. As shown in Figure 1, the battery 1 according to this embodiment is a so-called prismatic battery. Battery 1 may be a rechargeable battery such as a lithium-ion battery or a nickel-metal hydride battery. Battery 1 can be used, for example, as a cell included in an energy storage module mounted on an electric vehicle. 【0015】 FIG. 2 is an exploded perspective view of the battery according to Embodiment 1. FIG. 3 is a cross-sectional view of the battery of FIG. 1 as viewed in the direction of the arrow III-III. As shown in FIGS. 1 to 3, the battery 1 according to Embodiment 1 includes an electrode body 10, a case 20, a first external terminal 30A, a second external terminal 30B, a first connection member 40A, a second connection member 40B, a first seal ring 50A, a second seal ring 50B, a first terminal support portion 60A, a second terminal support portion 60B, an insulating member 70, and a fuse protection portion 80. 【0016】 The case 20 has conductivity. The conductive portion of the case 20 is made of a metal such as aluminum. The case 20 houses the electrode body 10. The case 20 also houses an electrolyte (not shown). 【0017】 The case 20 includes a case body 21 and a lid 22. The case body 21 includes a bottom wall 21a and a peripheral wall 21b that stands up from the bottom wall 21a. 【0018】 The bottom wall 21a includes a bottom main body 21aa, a pressure release valve 21ab, an outer protective film 21ac, and an inner protective film 21ad. The peripheral wall 21b stands up from the bottom main body 21aa. The pressure release valve 21ab is provided in the bottom main body 21aa. The outer protective film 21ac covers the pressure release valve 21ab from the outside. The inner protective film covers the pressure release valve 21ab from the inside. The bottom main body 21aa and the pressure release valve 21ab are made of a metal such as aluminum. 【0019】 An opening is formed at the upper end of the peripheral wall 21b. The peripheral wall 21b has a substantially rectangular outer shape when viewed from the opening direction (the normal direction of the opening surface) of the opening. The opening and the bottom wall 21a are arranged in the first direction D1. The first direction D1 may be the height direction or the vertical direction of the battery 1. The peripheral wall 21b is made of a metal such as aluminum. 【0020】 The lid 22 includes a lid body 22a, a sealing plug 22b, a plug cover 22c, and an insulating cover 22d. 【0021】 The lid body 22a is joined to the peripheral wall 21b by welding or the like so as to close the opening of the peripheral wall 21b. The lid body 22a is formed with a first connection hole 22aa, a second connection hole 22ab, and a liquid injection hole 22ac. The liquid injection hole 22ac is a through hole for injecting an electrolytic solution into the case body 21 in the manufacturing process of the battery 1. 【0022】 The sealing plug 22b seals the liquid injection hole 22ac. The plug cover 22c covers the liquid injection hole 22ac and the sealing plug 22b. The insulating cover 22d covers the liquid injection hole 22ac, the sealing plug 22b, and the plug cover 22c. 【0023】 The first external terminal 30A and the second external terminal 30B are provided so as to be exposed to the outside in the battery 1. The first connection member 40A and the second connection member 40B have conductivity. At least a part of the first connection member 40A and the second connection member 40B is disposed inside the case 20. 【0024】 The first external terminal 30A or the first connection member 40A is inserted into the first connection hole 22aa. The first external terminal 30A and the first connection member 40A are joined to each other. The first connection member 40A is joined to the electrode body 10. Thereby, the first external terminal 30A is electrically connected to the electrode body 10. 【0025】 The second external terminal 30B or the second connection member 40B is inserted into the second connection hole 22ab. The second external terminal 30B and the second connection member 40B are joined to each other. The second connection member 40B is joined to the electrode body 10. Thereby, the second external terminal 30B is electrically connected to the electrode body 10. 【0026】 In this embodiment, the first external terminal 30A is a positive electrode terminal, and the second external terminal 30B is a negative electrode terminal. The first external terminal 30A and the second external terminal 30B are arranged side by side in the second direction D2. The second direction D2 is a direction orthogonal to the first direction D1. 【0027】 The first seal ring 50A is provided along the first connecting hole 22aa. The first seal ring 50A is provided in the gap between the lid body 22a and the first external terminal 30A, and seals this gap. The second seal ring 50B is provided along the second connecting hole 22ab. The second seal ring 50B is provided in the gap between the lid body 22a and the second external terminal 30B, and seals this gap. The first seal ring 50A and the second seal ring 50B have electrical insulating properties. 【0028】 The first terminal support portion 60A is locked to the lid body 22a. The first terminal support portion 60A supports the first external terminal 30A from the outer circumference of the first external terminal 30A. The first terminal support portion 60A includes a first locking ring 61A and a first covering ring 62A. The first locking ring 61A extends in an annular shape so as to surround the first connecting hole 22aa and is locked directly to the lid body 22a. The first covering ring 62A covers the first locking ring 61A. The first locking ring 61A supports the first external terminal 30A via the first covering ring 62A. The first covering ring 62A is made of a resin material that is electrically insulating or has relatively weak conductivity. 【0029】 The second terminal support portion 60B is locked to the lid body 22a. The second terminal support portion 60B supports the second external terminal 30B from the outer circumference of the second external terminal 30B. The second terminal support portion 60B includes a second locking ring 61B and a second covering ring 62B. The second locking ring 61B extends in an annular shape so as to surround the second connecting hole 22ab and is locked directly to the lid body 22a. The second covering ring 62B covers the second locking ring 61B. The second locking ring 61B supports the second external terminal 30B via the second covering ring 62B. The second covering ring 62B is made of an electrically insulating resin material. 【0030】 The insulating member 70 has electrical insulating properties. The insulating member 70 is placed between the plurality of electrode bodies 10 and the case 20. The insulating member 70 electrically insulates the plurality of electrode bodies 10 and the case 20 from each other. The insulating member 70 includes an insulating bracket 71, a circumferential insulating portion 72, and a bottom insulating portion 73. 【0031】 The insulating bracket 71 is positioned between the multiple electrode bodies 10 and the lid body 22a. The insulating bracket 71 is relatively rigid and is in contact with both the electrode bodies 10 and the lid body 22a. As a result, the electrode bodies 10 are fixed to the case 20 in the first direction D1. 【0032】 The circumferential insulating portion 72 is positioned between the multiple electrode bodies 10 and the circumferential wall 21b. The circumferential insulating portion 72 is made of a film-like material. 【0033】 The bottom insulating portion 73 is positioned between each electrode body 10 and the bottom wall 21a. The bottom insulating portion 73 is made of a film-like material. In this embodiment, the bottom insulating portion 73 is adhered to the electrode body 10. Furthermore, the bottom insulating portion 73 covers only a portion of the bottom surface of the electrode body 10. However, the bottom insulating portion 73 may cover the entire bottom surface. 【0034】 As shown in Figure 2, the battery 1 according to this embodiment comprises a plurality of electrode bodies 10. Typically, the battery 1 comprises two electrode bodies 10. These electrode bodies 10 are aligned in a third direction D3. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2. The circumferential insulating portion 72 may integrally cover the plurality of electrode bodies 10 so that these electrode bodies 10 are fixed to each other. 【0035】 The electrode body 10 is provided with a plurality of first tabs 150A and a plurality of second tabs 150B. One end of the plurality of first tabs 150A is connected to the first conductive layer 121 (see Figure 5) and the second conductive layer 122 (see Figure 5) of the first electrode member 11A (see Figure 4), which will be described later. The other end of the plurality of first tabs 150A is joined to the first connecting member 40A by ultrasonic welding or the like. 【0036】 One end of each of the multiple second tabs 150B is connected to the second base material 100B of the second electrode member 11B (see Figure 4), which will be described later. The other end of each of the multiple second tabs 150B is joined to the second connecting member 40B mentioned above by ultrasonic welding or the like. 【0037】 Figure 4 is a cross-sectional view of the electrode body of Figure 3, viewed in the direction of the IV-IV arrow. The electrode body 10 includes a first electrode member 11A, a second electrode member 11B, a separator 12, and a tape member 13. The electrode body 10 is wound so that the first electrode member 11A, the second electrode member 11B, and the separator 12 surround the winding axis Z. In this embodiment 1, the case where the electrode body 10 is a wound electrode body is described as an example, but it is not limited to this. The electrode body 10 may also be a laminated electrode body in which the first electrode member 11A, the second electrode member 11B, and the separator 12 are stacked in one direction (for example, a third direction D3). In Figure 4, the separator 12 is schematically shown by a dashed line. 【0038】 The first electrode member 11A and the second electrode member 11B have a sheet-like outer shape. The electrode body 10 is constructed by winding the first electrode member 11A and the second electrode member 11B around one or more separators 12. The first electrode member 11A is, for example, the positive electrode, and the second electrode member 11B is the negative electrode. 【0039】 The first electrode member 11A includes a first substrate 100A and a first active material layer 200A. The first active material layer 200A has the same polarity as the first electrode member 11A. The first active material layer 200A is, for example, a positive electrode active material layer. A known positive electrode active material layer can be used. 【0040】 The first active material layer 200A is provided on both the front and back surfaces of the first substrate 100A. The detailed structure of the first substrate 100A will be described later with reference to Figure 5. 【0041】 The second electrode member 11B includes a second substrate 100B and a second active material layer 200B. The second active material layer 200B has the same polarity as the second electrode member 11B. The second electrode member 11B is, for example, a negative electrode active material layer. Known materials can be used as the negative electrode active material layer. 【0042】 The second substrate 100B is made of a metal member containing copper, such as copper foil. The second active material layer 200B is provided on the front and back surfaces of the second substrate 100B. 【0043】 The separator 12 is provided between the first electrode member 11A and the second electrode member 11B. The separator 12 separates the first electrode member 11A and the second electrode member 11B while allowing ions to move between them. The ions are, for example, lithium ions. The separator 12 has electrical insulating properties. 【0044】 In the electrode body 10, a separator 12 is located at the innermost circumference. Also, a separator 12 is located at the outermost circumference of the electrode body 10. In the winding direction DR, the outer edge of the separator 12 is fixed by a tape member 13 placed on the outer surface of the separator 12. 【0045】 The separator 12 may contain, for example, a polyolefin resin. The separator 12 may be substantially made of a polyolefin resin. The polyolefin resin may contain, for example, at least one selected from the group consisting of polyethylene (PE) and polypropylene (PP). 【0046】 Figure 5 is a cross-sectional view of the first electrode member according to Embodiment 11 in an unfolded state. Figure 5 shows a cross-sectional view of the first electrode member 11A in a cross section perpendicular to the second direction. 【0047】 As shown in Figure 5, the first substrate 100A of the first electrode member 11A has a coated region R1 on which the first active material layer 200A is coated, and an uncoated region R2 on which the first active material layer 200A is not coated. In the first electrode member 11A, the first substrate 100A includes a first resin substrate 110 as a resin substrate, and a first conductive layer 121 and a second conductive layer 122 laminated on the first resin substrate 110. 【0048】 The first resin substrate 110 has a first surface 110a and a second surface 110b in the thickness direction. The thickness direction is parallel to the lamination direction in which the first substrate 100A and the first active material layer 200A are laminated. 【0049】 The first resin substrate 110 has a first portion 111 and a second portion 112 in the width direction perpendicular to the lamination direction. The width direction is parallel to the first direction D1 when wound. 【0050】 The first portion 111 is located in the center in the width direction. The first portion 111 overlaps with the first active material layer 200A in the lamination direction. The first portion 111 is located in the coating region R1. 【0051】 The second portion 112 is located on both outer sides of the first portion 111 in the width direction. The second portion 112 does not overlap with the first active material layer 200A in the stacking direction. The second portion 112 is located in the uncoated region R2. 【0052】 The first resin substrate 110 is composed of a crystalline polymer. Examples of crystalline polymers that can be used include polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), and polyphenylene sulfide (PPS). 【0053】 The crystallinity of the first resin substrate 110 (crystalline polymer) located in the coated region R1 is greater than that of the first resin substrate 110 (crystalline polymer) located in the uncoated region R2. This crystallinity can be measured using a differential scanning calorimeter (DSC). 【0054】 The first conductive layer 121 is formed on the first surface 110a. The first conductive layer 121 is formed in both the coated region R1 and the uncoated region R2. The second conductive layer 122 is formed on the second surface 110b. The second conductive layer 122 is formed in both the coated region R1 and the uncoated region R2. 【0055】 The first conductive layer 121 and the second conductive layer 122 are made of a metal member containing aluminum. The first conductive layer 121 and the second conductive layer 122 may be formed on the first surface 110a and the second surface 110b by vapor deposition or the like. Alternatively, the first conductive layer 121 and the second conductive layer 122 may be made of metal foil and bonded to the first surface 110a and the second surface 110b with an adhesive. 【0056】 The first active material layer 200A is formed on the first conductive layer 121 and the second conductive layer 122. Specifically, the first active material layer 200A is formed on the first conductive layer 121 and the second conductive layer 122 in the central part in the width direction. 【0057】 The first active material layer 200A has a first portion 210A and a second portion 220A. The first portion 210A is formed on the first conductive layer 121. The second portion 220A is formed on the second conductive layer 122. 【0058】 Generally, in the manufacturing of electrode components, there is a pressing process in which the first active material layer 200A and the first base material 100A are sandwiched between a pair of rollers and pressed in order to fix the first active material layer 200A onto the first base material 100A. In the pressing process, the coated area R1 of the first base material 100A, to which the first active material layer 200A has been applied, is easily stretched because it is sandwiched between the pair of rollers. On the other hand, the uncoated area R2 of the first base material 100A, to which the first active material layer 200A has not been formed, is not easily stretched because it is not sandwiched between the pair of rollers. 【0059】 In this embodiment, the elongation of the coated region R1 can be suppressed because the crystallinity of the first resin substrate 110 is higher in the easily stretchable coated region R1 than in the less stretchable uncoated region R2. Furthermore, in the pressing process, the elongation of the uncoated region R2 can be promoted because the crystallinity of the first resin substrate 110 is lower in the less stretchable uncoated region R2. As a result, the difference in elongation between the uncoated region R2 and the coated region R1 can be reduced. Consequently, the occurrence of wrinkles and deformation into a curved shape can be suppressed in the less stretchable region where the first active material layer 200A is not formed. 【0060】 Furthermore, when polypropylene is used as the crystalline polymer constituting the first resin substrate 110, since polypropylene is a less elongated material compared to polyethylene and the like, the difference in elongation between the coated region R1 and the uncoated region R2 of the first resin substrate 110 can be further reduced. 【0061】 (Variation Example 1) Figure 6 is a cross-sectional view of the second electrode member according to Modification Example 1 in an unfolded state. The second electrode member 11X according to Modification Example 1 will be described with reference to Figure 6. Note that the second electrode member 11X according to Modification Example 1 can be applied to the electrode body 10 according to Embodiment 1. 【0062】 As shown in Figure 6, the second electrode member 11X differs from the second electrode member 11B according to Embodiment 1 in the configuration of the second base material 100B. The other configurations are substantially the same. 【0063】 As shown in Figure 6, the second substrate 100B of the second electrode member 11X has a coated region R3 on which the second active material layer 200B is coated, and an uncoated region R4 on which the second active material layer 200B is not coated. In the second electrode member 11X, the second substrate 100B includes a second resin substrate 110X and a third conductive layer 121X and a fourth conductive layer 122X laminated on the second resin substrate 110X. 【0064】 The second resin substrate 110X has a first surface 110a1 and a second surface 110b1 in the thickness direction. The thickness direction is parallel to the lamination direction in which the second substrate 100X and the second active material layer 200B are laminated. The second resin substrate 110X has a first portion 111X and a second portion 112X in the width direction. 【0065】 The first portion 111X is located in the center in the width direction. The first portion 111X overlaps with the second active material layer 200B in the lamination direction. The first portion 111X is located in the coating area R3. 【0066】 The second portion 112X is located on both outer sides of the first portion 111X in the width direction. The second portion 112X does not overlap with the second active material layer 200B in the lamination direction. The second portion 112X is located in the uncoated region R4. 【0067】 The second resin substrate 110X is composed of a crystalline polymer. Examples of crystalline polymers that can be used include polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET), and polyphenylene sulfide (PPS). 【0068】 The crystallinity of the second resin substrate 110X (crystalline polymer) located in the coated region R3 is greater than that of the second resin substrate 110X (crystalline polymer) located in the uncoated region R4. 【0069】 The third conductive layer 121X is formed on the first surface 110a1. The third conductive layer 121X is formed in both the coated region R3 and the uncoated region R4. The fourth conductive layer 122X is formed on the second surface 110b1. The fourth conductive layer 122X is formed in both the coated region R3 and the uncoated region R4. 【0070】 The third conductive layer 121X and the fourth conductive layer 122X are composed of a metal member containing copper. The third conductive layer 121X and the fourth conductive layer 122X may be formed on the first surface 110a1 and the second surface 110b1 by vapor deposition or the like. Alternatively, the third conductive layer 121X and the fourth conductive layer 122X may be composed of metal foil and bonded to the first surface 110a1 and the second surface 110b1 with an adhesive. 【0071】 The second active material layer 200B is formed on the third conductive layer 121X and the fourth conductive layer 122X. Specifically, the second active material layer 200B is formed on the third conductive layer 121X and the fourth conductive layer 122X in the central part in the width direction. 【0072】 The second active material layer 200B has a first portion 210B and a second portion 220B. The first portion 210B is formed on the third conductive layer 121X. The second portion 220B is formed on the fourth conductive layer 122X. 【0073】 Even when configured as described above, the second electrode member 11B according to Modification 1 provides substantially the same effects as the first electrode member 11A according to Embodiment 1. 【0074】 Furthermore, in the battery equipped with the second electrode member 11B according to Modification 1, the crystallinity of the crystalline polymer located in the coated region of the first electrode member 11A and the second electrode member 11B is higher than that of the crystalline polymer located in the uncoated region. Therefore, the occurrence of wrinkles and bending in the uncoated region can be suppressed in both the first electrode member 11A and the second electrode member 11B. 【0075】 (Other variations) In the above-described embodiment 1, the case in which the first electrode member 11A is the positive electrode and the second electrode member 11B is the negative electrode is illustrated, but the invention is not limited to this. The first electrode member 11A may be the negative electrode and the second electrode member 11B may be the positive electrode. In this case, each component constituting the first electrode member 11A and the second electrode member 11B is selected to be suitable for the polarity of the substrate. 【0076】 The embodiments and modifications disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims and includes all modifications within the meaning and scope equivalent to the claims. [Explanation of Symbols] 【0077】 1 Battery, 10 Electrode body, 11A First electrode member, 11B, 11X Second electrode members, 12 Separator, 13 Tape member, 20 Case, 21 Case body, 21a Bottom wall, 21aa Bottom body, 21ab Pressure relief valve, 21ad Inner protective film, 21b Peripheral wall, 22 Lid, 22a Lid body, 22aa First connecting hole, 22ab Second connecting hole, 22b Sealing plug, 22c Plug cover, 22d Insulating cover, 30A First external terminal, 30B Second external terminal, 40A First connecting member, 40B Second connecting member, 50A First sealing ring, 50B Second sealing ring, 60A First terminal support part, 60B Second terminal support part, 61A First locking ring, 61B Second locking ring, 62A First covering ring, 62B Second covering ring, 70 Insulating member, 71 Insulating bracket, 72 Peripheral insulating part, 73 Bottom insulating part, 80 Fuse protection part, 100A First base material, 100B, 100X Second base material, 110 First resin base material, 110X Second resin base material, 110a, 110a1 First surface, 110b, 110b1 Second surface, 111, 111X First part, 112, 112X Second part, 121 First conductive layer, 121X Third conductive layer, 122 Second conductive layer, 122X Fourth conductive layer, 150A First tab, 150B Second tab, 200A First active material layer, 200B Second active material layer, 210A, 210B First part, 220A, 220B Second part, D1 First direction, D2 Second direction, D3 Third direction, DR Winding direction, R1 R1 is the coated area, R2 is the uncoated area, R3 is the coated area, R4 is the uncoated area, and Z is the winding axis.

Claims

[Claim 1] A substrate comprising a resin substrate and a conductive layer formed on the resin substrate, The conductive layer comprises an active material layer formed on the conductive layer, The substrate has a coated region to which the active material layer is applied and an uncoated region to which the active material layer is not applied. The aforementioned resin substrate is composed of a crystalline polymer. An electrode member wherein the crystallinity of the crystalline polymer located in the coated region is greater than the crystallinity of the crystalline polymer located in the uncoated region. [Claim 2] The electrode member according to claim 1, wherein the crystalline polymer is polypropylene.

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