Lamination electrode body and power storage module

Abstract

To provide a lamination electrode body in which the impregnation of an electrolyte solution is excellent and the decrease in volume energy density in a power storage module can be suppressed.SOLUTION: A lamination electrode body extends in a second direction that is perpendicular to a first direction that is a lamination direction of each electrode and each separator. First and second surfaces of a metal foil of each electrode includes an active material coating region extending in the second direction, and an active material non-coating region. The active material non-coating region on the second surface exists on a rear side of the active material non-coating region on the first surface. The active material non-coating region on the second surface includes a first resin arrangement region in which resin is arranged and which exists on the active material coating region side of the second surface. A first space is formed on the first resin arrangement region side between the separator and an end part, in a third direction perpendicular to the first and second directions, of the active material non-coating region on the second surface.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a stacked electrode assembly and an electricity storage module. [Background technology]

[0002] Electricity storage modules have been known for some time. JP 2022-65369 A (Patent Document 1) discloses an electricity storage device as such an electricity storage module, which aims to shorten the time required for electrolyte impregnation. The electricity storage device includes a cell stack in which a plurality of electricity storage cells are stacked in a stacking direction. Each electricity storage cell is provided with an injection tube that connects the inside and outside of the electricity storage cell. The injection tube has an injection port that penetrates the spacer, a first internal passage that extends along the short side as viewed from the stacking direction, and a second internal passage that extends from the short side of the positive electrode active material layer toward the short side as viewed from the stacking direction. Each of the first internal passage and the second internal passage is provided with an outlet hole that faces the positive electrode active material layer.

[0003] The spacer is disposed between the positive electrode current collector and the negative electrode current collector and is joined to the positive electrode current collector and the negative electrode current collector so as to surround the positive electrode active material layer and the negative electrode active material layer when viewed from the stacking direction. Specifically, the spacer forms a storage space surrounded by the spacer, the positive electrode current collector, and the negative electrode current collector. The storage space contains a separator, a positive electrode active material layer, and a negative electrode active material layer, each of which is impregnated with an electrolyte solution. The spacer also functions as a sealing part that seals the storage space between the positive electrode current collector and the negative electrode current collector, preventing the electrolyte solution contained in the storage space from leaking to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2022-65369 Summary of the Invention [Problem to be solved by the invention]

[0005] In the battery cell of Patent Document 1, the electrolyte injected through the inlet selectively passes through the first internal path and the second internal path and is then discharged into the storage space through each discharge hole. In this battery cell, the first internal path and the second internal path are formed within the storage space, so it is necessary to secure space within the storage space for installing the first internal path and the second internal path. Therefore, in the energy storage module of Patent Document 1 that includes multiple such battery cells, a decrease in volumetric energy density is unavoidable.

[0006] The present disclosure provides a stacked electrode body that has excellent electrolyte impregnation properties and can suppress a decrease in volumetric energy density in an electricity storage module, and an electricity storage module including the stacked electrode body. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, a laminated electrode body includes a plurality of electrodes and a plurality of separators. The electrodes and separators are alternately stacked in a first direction. The laminated electrode body extends in a second direction perpendicular to the first direction. Each electrode includes a metal foil having a first surface and a second surface opposite to the first surface. Each of the first surface and the second surface has an active material-coated region extending in the second direction and coated with an active material, and an active material-uncoated region that is continuous with the active material-coated region in the second direction and is not coated with an active material. The active material-uncoated region of the second surface is located on the back side of the active material-uncoated region of the first surface of the metal foil. The active material-uncoated region of the second surface has a resin disposed therein and has a first resin-disposed region located on the side of the active material-coated region of the second surface. A first space is formed on the first resin arrangement region side between the separator and an end portion of the active material uncoated region of the second surface in a third direction perpendicular to the first direction and the second direction.

[0008] With this configuration, it is possible to impregnate the interior of the stacked electrode body with the electrolyte solution through each first space. That is, each first space can be used as a supply path for the electrolyte solution. Therefore, it is not necessary to provide a conduit for guiding the electrolyte solution within the container that houses the stacked electrode body. Therefore, the stacked electrode body has excellent electrolyte solution impregnation properties and can suppress a decrease in volumetric energy density in an energy storage module that includes the stacked electrode body and the container.

[0009] Preferably, the resin is in contact with the separator. The length of the first resin-disposed region in the third direction is shorter than the length of the metal foil in the third direction.

[0010] With this configuration, each first space can be formed in the laminated electrode body.

[0011] Preferably, a spacer made of resin is disposed between the resin and the separator.

[0012] With this configuration, each first space can be formed in the laminated electrode body.

[0013] Preferably, the active material uncoated region of the first surface has a resin disposed therein and has a second resin-disposed region located on the active material coated region side of the first surface, and a second space is formed on the second resin-disposed region side between the separator and an end of the active material uncoated region of the first surface in the third direction.

[0014] This configuration allows the electrolyte to be impregnated into the inside of the laminated electrode body through the first spaces and the second spaces, resulting in better electrolyte impregnation than when only the first spaces are formed.

[0015] According to another aspect of the present disclosure, an electricity storage module includes the above-described stacked electrode body and a housing that houses the stacked electrode body.

[0016] According to this configuration, an electricity storage module can be constructed using a laminated electrode assembly that has excellent electrolyte impregnation properties, thereby making it possible to suppress a decrease in volumetric energy density. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to provide a stacked electrode body that has excellent electrolyte impregnation properties and can suppress a decrease in volumetric energy density in an electricity storage module, and an electricity storage module that includes the stacked electrode body. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the storage module. [Figure 2] FIG. 2 is a diagram showing a stacked electrode body included in an electricity storage module. [Figure 3] FIG. 2 is a view of the negative electrode viewed in a predetermined direction. [Figure 4] FIG. 4 is a view of the negative electrode viewed in the opposite direction to that of FIG. [Figure 5] FIG. 5 is a view of the negative electrode as seen in the direction of arrow V in FIGS. 3 and 4. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. [Figure 7] FIG. 2 is a diagram showing a laminated electrode body. [Figure 8] FIG. 2 is a view of the negative electrode viewed in a predetermined direction. [Figure 9] FIG. 9 is a view of the negative electrode viewed in the opposite direction to that of FIG. 8. [Figure 10] 10 is a view of the negative electrode as seen in the direction of arrow X in FIGS. 8 and 9. FIG. [Figure 11] FIG. 10 is a cross-sectional view taken along the line XI-XI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0020] FIG. 1 is a perspective view of an energy storage module according to the present embodiment. FIG. 2 is a diagram showing a laminated electrode body included in the energy storage module of FIG. 1. As shown in FIGS. 1 and 2, the energy storage module 1 has a blade shape. The energy storage module 1 includes a laminated electrode body 100 and a housing body 2 that houses the laminated electrode body 100. For ease of explanation, the energy storage module 1 will be described below using as an example a case in which the energy storage module 1 is oriented such that the D3 direction shown in FIGS. 1 and 2 is vertical (more specifically, the direction of D31, which will be described later, faces vertically upward) except during injection of an electrolyte solution, which will be described later.

[0021] In this example, the energy storage module 1 is a lithium iron phosphate (LFP) battery. However, the energy storage module 1 is not limited to this, and may be a ternary (NMC) battery. The energy storage module 1 is mounted, for example, on an electric vehicle that runs on driving force obtained from electric energy. More specifically, a battery pack including a plurality of energy storage modules 1 arranged in a predetermined direction is mounted on the electric vehicle. The battery pack is attached to the body of the electric vehicle. The battery pack forms part of the body. The battery pack serves as a structural component of the body.

[0022] As shown in FIG. 1 , the housing 2 has a substantially rectangular parallelepiped shape. In this example, the housing 2 is a metal housing. The housing 2 has first to sixth surfaces 21 to 26. The first surface 21, the second surface 22, the third surface 23, and the fourth surface 24 are continuous in this order. The first surface 21, the second surface 22, the third surface 23, and the fourth surface 24 form the outer peripheral surface of the housing 2.

[0023] The fifth surface 25 and the sixth surface 26 are end surfaces of the housing body 2. The first surface 21 is the top surface, the second surface 22 is the bottom surface, and the third surface 23 and the fourth surface 24 are side surfaces. A negative electrode side external connection terminal 27 is provided on the fifth surface 25. A positive electrode side external connection terminal (not shown) is provided on the sixth surface 26.

[0024] As shown in FIG. 2, the laminated electrode body 100 has multiple electrodes (negative electrodes 110, positive electrodes 120) and multiple separators 130. In the laminated electrode body 100, multiple electrodes are stacked in the D1 direction (stacking direction). Specifically, in the laminated electrode body 100, the negative electrodes 110 and the positive electrodes 120 are stacked alternately in the D1 direction with the separators 130 interposed between them. To prevent short-circuiting between the negative electrodes 110 and the positive electrodes 120, the length of the separators 130 in the D3 direction is longer than the lengths of the negative electrodes 110 and the positive electrodes 120 in the D3 direction. The D1 direction is the width direction of the energy storage module 1.

[0025] The laminated electrode body 100 further includes a tab 150 connected to the negative electrode side external connection terminal 27, and a tab 160 connected to the positive electrode side external connection terminal. The tab 150 is made of a copper foil. The tab 160 is made of an aluminum foil. The orientation of D11 in the D1 direction is the direction from the third surface 23 to the fourth surface 24 of the housing body 2 shown in FIG. 1. The orientation of D21 in the D1 direction is the direction from the fourth surface 24 to the third surface 23.

[0026] As shown in FIG. 1, the energy storage module 1 and the housing body 2 extend in the D2 direction. As shown in FIG. 2, the stacked electrode body 100 extends in the D2 direction. The D2 direction is perpendicular to the D1 direction. The D2 direction is the longitudinal direction of the energy storage module 1, the housing body 2, and the stacked electrode body 100. The D3 direction is perpendicular to the D1 and D2 directions. The D3 direction is the height direction of the energy storage module 1. Note that the direction of D21 in the D2 direction is the direction from the sixth surface 26 to the fifth surface 25 of the housing body 2 shown in FIG. 1. The direction of D22 in the D2 direction is the direction from the fifth surface 25 to the sixth surface 26.

[0027] The D1 direction is the short-side direction of each of the first surface 21, the second surface 22, the fifth surface 25, and the sixth surface 26. The D2 direction is the long-side direction of the first to fourth surfaces 21 to 24. The D3 direction is the short-side direction of the third and fourth surfaces 23 and 24, and the long-side direction of the fifth and sixth surfaces 25 and 26.

[0028] A liquid inlet 2h for injecting the electrolyte into the container 2 is formed on the fifth surface 25. The liquid inlet 2h is formed closer to the first surface 21 than the second surface 22 of the container 2. The liquid inlet 2h is formed closer to the first surface 21 than the external connection terminal 27. In the state shown in FIG. 1, the liquid inlet 2h is blocked because the electrolyte has already been injected into the container 2. The liquid inlet 2h may be temporarily blocked by inserting a removable plug into the liquid inlet 2h. Alternatively, the liquid inlet 2h may be blocked with resin or metal, so that the electrolyte cannot be reinjected unless a through-hole is opened.

[0029] When injecting the electrolyte solution through the injection hole 2h during manufacturing of the energy storage module 1, the attitude of the energy storage module 1 is maintained so that the D2 direction is approximately vertical and the fifth surface 25 is higher than the sixth surface 26. The weight of the electrolyte solution causes the electrolyte solution to flow from the fifth surface 25 side to the sixth surface 26 side. Note that the electrolyte solution has a certain degree of viscosity, and therefore falls within the container 2 at a relatively slow speed. This allows the stacked electrode body 100 to be impregnated with the electrolyte solution. Note that the method of injecting the electrolyte solution is not limited to this. The electrolyte solution may be injected into the energy storage module 1 while the pressure inside the energy storage module 1 is reduced (reduced pressure injection).

[0030] In this example, the liquid inlet 2h is formed closer to the first surface 21 than the external connection terminal 27, but is not limited to this. The liquid inlet 2h may be formed closer to the second surface 22 than the external connection terminal 27. The liquid inlet 2h may be formed closer to the third surface 23 than the external connection terminal 27. The liquid inlet 2h may be formed closer to the fourth surface 24 than the external connection terminal 27.

[0031] Furthermore, in this example, the configuration in which the liquid inlet 2h is formed on the fifth surface 25 has been described as an example, but the present invention is not limited to this. For example, the liquid inlet 2h may be formed on the sixth surface 26. The liquid inlet 2h may be formed on the first surface 21 or the second surface 22. When the liquid inlet 2h is formed on the first surface 21 or the second surface 22, from the viewpoint of liquid inlet performance, it is preferable that the liquid inlet 2h be formed closer to the end portion (the fifth surface 25 side or the sixth surface 26 side) than to the center in the longitudinal direction of the container 2. The liquid inlet 2h may be formed on the third surface 23 or the fourth surface 24. The position in which the liquid inlet 2h is formed is not particularly limited.

[0032] Fig. 3 is a view of the negative electrode 110 viewed in the direction D11 in Fig. 2. In Fig. 3, since the positive electrode 120 will also be described, for convenience of explanation, reference symbols indicating the respective parts and directions of the positive electrode 120 are shown in parentheses.

[0033] As shown in FIG. 3, the negative electrode 110 includes a metal foil 111. The metal foil 111 is a base member of the negative electrode 110. The metal foil 111 is typically a copper foil. The metal foil 111 extends in the D2 direction over the length of the negative electrode 110 in the D2 direction. Similarly, the metal foil 111 extends in the D3 direction over the length (width) of the negative electrode 110 in the D3 direction. The D1 direction is the thickness direction of the metal foil 111.

[0034] The metal foil 111 has a first main surface 1111. The first main surface 1111 extends in the D2 direction over the length of the negative electrode 110 in the D2 direction. Similarly, the first main surface 1111 extends in the D3 direction over the length (width) of the negative electrode 110 in the D3 direction. The normal direction of the first main surface 1111 is the D1 direction.

[0035] The first main surface 1111 extends in the D2 direction and has an active material-coated region P111 that is coated with an active material 112. The first main surface 1111 further has an active material-uncoated region Q111 that is continuous with the active material-coated region P111 in the D2 direction and that is not coated with the active material 112. The active material-uncoated region Q111 is positioned in the D21 direction relative to the active material-coated region P111.

[0036] The active material uncoated region Q111 has a resin 113 disposed therein and a partial region Q111a located on the active material coated region P111 side of the first main surface 1111. In this example, the partial region Q111a is continuous with the active material coated region P111. On the first main surface 1111, only the region of the active material uncoated region Q111 excluding the partial region Q111a is exposed. Specifically, in FIG. 3, the metal foil 111 is exposed at the right end portion of the metal foil 111. Note that the direction of D32 in the D3 direction is vertically downward.

[0037] For example, resin 113 can be formed by applying resin to partial region Q111a. Alternatively, resin 113 may be formed by thermally welding a resin film to partial region Q111a. The resin film may also be welded by laser irradiation or the like. Resin 113 is disposed in partial region Q111a by such a method. The same applies to resins 123, 115, 115A, 125, and 125A, which will be described later.

[0038] Next, the positive electrode 120 will be described. The positive electrode 120 includes a metal foil 121. The metal foil 121 is a base member of the positive electrode 120. The metal foil 121 is typically an aluminum foil. The metal foil 121 extends in the D2 direction over the length of the positive electrode 120 in the D2 direction. Similarly, the metal foil 121 extends in the D3 direction over the length (width) of the positive electrode 120 in the D3 direction. The D1 direction is the thickness direction of the metal foil 121.

[0039] The metal foil 121 has a first main surface 1211. The first main surface 1211 extends in the D2 direction over the length of the positive electrode 120 in the D2 direction. Similarly, the first main surface 1211 extends in the D3 direction over the length (width) of the positive electrode 120 in the D3 direction. The normal direction of the first main surface 1211 is the D1 direction. In this example, the first main surface 1111 of the negative electrode 110, the second main surface 1112 of the negative electrode 110, the first main surface 1211 of the positive electrode 120, and the second main surface 1212 of the positive electrode 120 are repeatedly positioned in this order in the D1 direction.

[0040] The first main surface 1211 extends in the D2 direction and has an active material-coated region P121 that is coated with an active material 122. The first main surface 1211 further has an active material-uncoated region Q121 that is continuous with the active material-coated region P121 in the D2 direction and that is not coated with the active material 122. The active material-uncoated region Q121 is positioned in the D22 direction relative to the active material-coated region P121.

[0041] The active material uncoated region Q121 has a resin 123 disposed therein and a partial region Q121a located on the active material coated region P121 side of the first main surface 1211. In this example, the partial region Q121a is continuous with the active material coated region P121. In the first main surface 1211, only the region of the active material uncoated region Q121 excluding the partial region Q121a is exposed. In FIG. 3, the metal foil 121 is exposed at the right end. In this example, the material of the resin 123 is the same as the material of the resin 113.

[0042] Fig. 4 is a view of the negative electrode 110 as viewed in the direction D12 in Fig. 2. In Fig. 4, in order to also explain the positive electrode 120, reference symbols indicating the respective parts and directions of the positive electrode 120 are shown in parentheses, as in Fig. 3.

[0043] As shown in Fig. 4, the metal foil 111 further has a second main surface 1112. The second main surface 1112 of the negative electrode 110 is the backside of the first main surface 1111 shown in Fig. 3. Like the first main surface 1111, the second main surface 1112 extends in the D2 direction over the length of the negative electrode 110 in the D2 direction. The second main surface 1112 extends in the D3 direction over the length (width) of the negative electrode 110 in the D3 direction. The normal direction of the second main surface 1112 is the same as the normal direction (D1 direction) of the first main surface 1111.

[0044] The second main surface 1112 extends in the D2 direction and has an active material-coated region P112 that is coated with an active material 114. The second main surface 1112 further has an active material-uncoated region Q112 that is continuous with the active material-coated region P112 in the D2 direction and that is not coated with the active material 114. The active material-uncoated region Q112 is positioned in the D21 direction relative to the active material-coated region P112.

[0045] The active material uncoated region Q112 has a partial region Q112a on which resin 115 is disposed and which is located on the active material coated region P112 side of the second main surface 1112. In this example, the partial region Q112a is continuous with the active material coated region P112. The material of the resin 115 is the same as the material of the resin 113.

[0046] The active material-uncoated region Q112 further has a first end E112a and a second end E112b. The second end E112b is located lower than the first end E112a. The partial region Q112a does not reach the first end E111a. Similarly, the partial region Q112a does not reach the second end E111b.

[0047] Therefore, the length in the D3 direction of the partial region Q112a is shorter than the length in the D3 direction of the metal foil 111. The length in the D3 direction of the partial region Q112a is shorter than the length in the D3 direction (width) of the second main surface 1112. The length in the D3 direction of the partial region Q112a is shorter than the length in the D3 direction of the active material uncoated region Q112. The length in the D3 direction of the partial region Q112a is shorter than the length in the D3 direction of the partial region Q111a shown in FIG. 3.

[0048] Only the active material uncoated region Q112, excluding the partial region Q112a, is exposed on the second main surface 1112. More specifically, only the U-shaped region of the active material uncoated region Q112, excluding the partial region Q112a, is exposed on the second main surface 1112. Specifically, in FIG. 4, the left end of the metal foil 111 and portions above and below the partial region Q112a are exposed.

[0049] Next, the positive electrode 120 will be described. The metal foil 121 of the positive electrode 120 further has a second main surface 1212. The second main surface 1212 is the backside of the first main surface 1211 shown in FIG. 3. Like the first main surface 1211, the second main surface 1212 extends in the D2 direction over the length of the positive electrode 120 in the D2 direction. The second main surface 1212 extends in the D3 direction over the length (width) of the positive electrode 120 in the D3 direction. The normal direction of the second main surface 1212 is the same as the normal direction (D1 direction) of the first main surface 1211.

[0050] The second main surface 1212 extends in the D2 direction and has an active material-coated region P122 that is coated with active material 124. The second main surface 1212 further has an active material-uncoated region Q122 that is continuous with the active material-coated region P122 in the D2 direction and is not coated with active material 124. The active material-uncoated region Q122 is positioned in the D22 direction relative to the active material-coated region P122.

[0051] The active material uncoated region Q122 has a partial region Q122a in which resin 125 is disposed and which is located on the active material coated region P122 side of the second main surface 1212. In this example, the partial region Q122a is continuous with the active material coated region P122. The material of the resin 125 is the same as the material of the resin 115.

[0052] The active material-uncoated region Q122 further has a first end E122a and a second end E122b. The second end E122b is located lower than the first end E122a. The partial region Q122a does not reach the first end E121a. Similarly, the partial region Q122a does not reach the second end E121b.

[0053] Therefore, the length in the D3 direction of the partial region Q122a is shorter than the length in the D3 direction of the metal foil 121. The length in the D3 direction of the partial region Q122a is shorter than the length in the D3 direction (width) of the second main surface 1212. The length in the D3 direction of the partial region Q122a is shorter than the length in the D3 direction of the active material uncoated region Q122. The length in the D3 direction of the partial region Q122a is shorter than the length in the D3 direction of the partial region Q121a shown in FIG. 3.

[0054] Only the active material uncoated region Q122, excluding partial region Q122a, is exposed on the second main surface 1212. More specifically, only the U-shaped region of the active material uncoated region Q122, excluding partial region Q122a, is exposed on the second main surface 1212. Specifically, in FIG. 4, the left end of the metal foil 121 and portions above and below partial region Q122a are exposed.

[0055] Fig. 5 is a view of the negative electrode 110 as viewed in the direction of arrow V in Fig. 3 and Fig. 4. In Fig. 5, in order to also explain the positive electrode 120, reference symbols indicating the respective parts and directions of the positive electrode 120 are shown in parentheses, as in Fig. 3 and the like.

[0056] As also shown in FIG. 5 , in the negative electrode 110, a resin 113 is disposed on a first main surface 1111 of a metal foil 111, and an active material 112 (not shown) is applied thereto. A resin 115 is disposed on a second main surface 1112 of the metal foil 111, and an active material 114 is applied thereto. As described above, the second main surface 1112 of the negative electrode 110 (more specifically, the active material uncoated region Q112) has a first end E112a and a second end E112b. The resin 115 is not disposed on the first end E112a or the second end E112b, and the active material 114 is not applied thereto. At least the first end E112a and the second end E112b are exposed.

[0057] In the positive electrode 120, a resin 123 is disposed on a first main surface 1211 of the metal foil 121, and the first main surface 1211 is coated with an active material 122 (not shown). A resin 125 is disposed on a second main surface 1212 of the metal foil 121, and the second main surface 1212 is coated with an active material 124. As described above, the second main surface 1212 of the positive electrode 120 (more specifically, the active material uncoated region Q122) has a first end E122a and a second end E122b. The resin 125 is not disposed on the first end E122a and the second end E122b, and the active material 124 is not coated on the first end E122a and the second end E122b. At least the first end E122a and the second end E122b are exposed.

[0058] Fig. 6 is a cross-sectional view taken along the line VI-VI in Fig. 2. As shown in Fig. 6, in the laminated electrode body 100, a negative electrode 110 and a positive electrode 120 are laminated in the direction D1 with a separator 130 interposed therebetween.

[0059] The resin 113 arranged in the partial region Q111a (FIG. 3) and the resin 115 arranged in the partial region Q112a (FIG. 4) are in contact with the separator 130. Specifically, in one negative electrode 110, the resin 115 is in contact with the separator 130 adjacent to the separator 130 with which the resin 113 is in contact. Specifically, the resin 115 is in contact with the separator 130 to the right of the separator 130 with which the resin 113 is in contact (the side facing D11).

[0060] A space S1 is formed on the partial region Q112a side between the separator 130 and first and second end portions E112a, E112b in the D3 direction of the active material-uncoated region Q112 (FIG. 4) of the second main surface 1112 of the negative electrode 110. Specifically, the space S1 is formed between the first end portion E112a and the separator 130 with which the resin 115 is in contact. The space S1 is formed between the second end portion E112b and the separator 130 with which the resin 115 is in contact. Two spaces S1 are formed between the metal foil 111 and the separator 130 with which the resin 115 is in contact. The two spaces S1 are spaced apart in the D3 direction. The spaces S1 are gaps.

[0061] The length of the partial region Q112a (FIG. 4) in the D3 direction is shorter than the length of the metal foil 111 in the D3 direction. Specifically, the length of the partial region Q112a in the D3 direction is shorter than the length of the active material uncoated region Q112 in the D3 direction. Therefore, a space S1 is formed between the metal foil 111 and the separator 130 with which the resin 115 is in contact. In this example, the partial region Q112a is formed in the center of the active material uncoated region Q112 in the D3 direction. Therefore, two spaces S1 are formed between the metal foil 111 and the separator 130 with which the resin 115 is in contact.

[0062] In this example, the length in the D3 direction of the partial region Q111a (FIG. 3) is the same as the length in the D3 direction of the metal foil 111. Specifically, the length in the D3 direction of the partial region Q111a is the same as the length in the D3 direction of the active material uncoated region Q111. Therefore, no space S1 is formed between the metal foil 111 and the separator 130 with which the resin 113 is in contact.

[0063] The space S1 formed between the negative electrode 110 and the separator 130 has been described above with reference to Fig. 6. In the laminated electrode body 100, as shown in Figs. 3, 4, and 5, the positive electrode 120 has a configuration similar to that of the negative electrode 110. Therefore, a space similar to the space S1 (hereinafter referred to as "space S2") is also formed between the positive electrode 120 and the separator 130. Note that the space S2 is hidden in the state of Fig. 6 and is therefore not shown.

[0064] Specifically, a space S2 is formed on the partial region Q122a side between the separator 130 and first and second end portions E122a, E122b in the D3 direction of the active material uncoated region Q122 (FIG. 4) of the second main surface 1212 of the positive electrode 120. More specifically, the space S2 is formed between the first end portion E122a and the separator 130 with which the resin 125 is in contact. The space S2 is formed between the second end portion E122b and the separator 130 with which the resin 125 is in contact. Two spaces S2 are formed between the metal foil 121 and the separator 130 with which the resin 125 is in contact.

[0065] The configuration of the positive electrode 120 side is not limited to the above. The resin 123 shown in Fig. 3 may be arranged on the second main surface 1212 side shown in Fig. 4, and the resin 125 shown in Fig. 4 may be arranged on the first main surface 1211 side shown in Fig. 3.

[0066] The first principal surfaces 1111, 1211 (FIG. 3) correspond to the "first surface" in this disclosure. The second principal surfaces 1112, 1212 (FIG. 4) correspond to the "second surface" in this disclosure. The active material-coated regions P111, P112, P121, P122 (FIGS. 3, 4) correspond to the "active material-coated regions" in this disclosure. The active material-uncoated regions Q111, Q112, Q121, Q122 (FIGS. 3, 4) correspond to the "active material-uncoated regions" in this disclosure.

[0067] Specifically, the active material uncoated regions Q111 and Q121 (FIG. 3) correspond to the "active material uncoated regions on the first surface" in this disclosure, and the active material uncoated regions Q112 and Q122 (FIG. 4) correspond to the "active material uncoated regions on the second surface" in this disclosure.

[0068] The partial regions Q111a and Q121a (FIG. 3) correspond to the "second resin arrangement region" of the present disclosure. The partial regions Q112a and Q122a (FIG. 4) correspond to the "first resin arrangement region" of the present disclosure. The first end portions E112a and 122a (FIG. 4) and the second end portions E112b and 122b (FIG. 4) correspond to the "end portions in the third direction" of the present disclosure. The spaces S1 and S2 correspond to the "first space" of the present disclosure.

[0069] In the above, the space S1 is formed by the resin 115 (FIGS. 4 and 6), and the space S2 is formed by the resin 125 (FIG. 4). Specifically, as shown in FIG. 6, the space S1 is formed between the metal foil 111 and the separator 130 on the right side (D11 side) of the metal foil 111. Similarly, the space S2 (not shown) is formed between the metal foil 121 and the separator 130 on the D12 side (see FIG. 5) of the metal foil 121.

[0070] On the other hand, since the length of the resin 113 (FIGS. 4 and 6) in the D3 direction is the same as the length of the metal foil 111 in the D3 direction, no space like the space S1 is formed between the metal foil 111 and the separator 130 on the left side (D12 side) of the metal foil 111, as shown in FIG. 6. Similarly, since the length of the resin 123 (FIG. 4) in the D3 direction is the same as the length of the metal foil 121 in the D3 direction, no space like the space S2 is formed between the metal foil 121 and the separator 130 on the D11 side of the metal foil 121.

[0071] However, this is not limiting. By making the shape and arrangement of resin 113 (FIG. 3) the same as those of resin 115 (FIG. 4), a space similar to space S1 (hereinafter referred to as "space S1'") may be formed between metal foil 111 and separator 130 on the D12 side (left side in FIG. 6) of metal foil 111. Similarly, by making the shape and arrangement of resin 123 (FIG. 3) the same as those of resin 125 (FIG. 4), a space similar to space S2 (hereinafter referred to as "space S2'") may be formed between metal foil 121 and separator 130 on the D11 side of metal foil 121.

[0072] More specifically, a space S1' may be formed between the separator 130 and both ends in the D3 direction of the active material-uncoated region Q111 of the first main surface 1111 of the negative electrode 110. Similarly, a space S2' may be formed between the separator 130 and both ends in the D3 direction of the active material-uncoated region Q121 of the first main surface 1211 of the positive electrode 120. In this manner, a space may be formed between the separator 130 and both ends in the D3 direction of the active material-uncoated regions Q111, Q121 of the first main surfaces 1111, 1211. Note that these spaces S1', S2' correspond to "second spaces."

[0073] <Summary> (1) As shown in Figures 1 and 2, the energy storage module 1 includes a laminated electrode body 100 and a housing 2 that has an inlet 2h for an electrolyte solution to be impregnated into the laminated electrode body 100 and houses the laminated electrode body 100. As shown in Figure 2, the laminated electrode body 100 has electrodes (negative electrodes 110, positive electrodes 120) and separators 130 alternately stacked in the direction D1 and extends in the direction D2 perpendicular to the direction D1.

[0074] 3, 4, and 5, each negative electrode 110 includes a metal foil 111 having a first major surface 1111 and a second major surface 1112 opposite to the first major surface 1111. Each positive electrode 120 includes a metal foil 121 having a first major surface 1211 and a second major surface 1212 opposite to the first major surface 1211.

[0075] 3, the first main surface 1111 of the negative electrode 110 has an active material-coated region P111 that extends in the D2 direction and is coated with the active material 112, and an active material-uncoated region Q111 that is continuous with the active material-coated region P111 in the D2 direction and is not coated with the active material 112. Similarly, the first main surface 1211 of the positive electrode 120 has an active material-coated region P121 that extends in the D2 direction and is coated with the active material 112, and an active material-uncoated region Q121 that is continuous with the active material-coated region P121 in the D2 direction and is not coated with the active material 122.

[0076] 4, the second main surface 1112 of the negative electrode 110 has an active material-coated region P112 that extends in the D2 direction and is coated with the active material 114, and an active material-uncoated region Q112 that is continuous with the active material-coated region P112 in the D2 direction and is not coated with the active material 114. Similarly, the second main surface 1212 of the positive electrode 120 has an active material-coated region P122 that extends in the D2 direction and is coated with the active material 114, and an active material-uncoated region Q122 that is continuous with the active material-coated region P122 in the D2 direction and is not coated with the active material 124.

[0077] 3 and 4, the active material uncoated region Q112 of the second main surface 1112 of the negative electrode 110 is located on the back side of the active material uncoated region Q111 of the first main surface 1111 of the metal foil 111. Similarly, the active material uncoated region Q122 of the second main surface 1212 of the positive electrode 120 is located on the back side of the active material uncoated region Q121 of the first main surface 1211 of the metal foil 121.

[0078] 3, the active material uncoated region Q111 of the first main surface 1111 of the negative electrode 110 has a partial region Q111a where the resin 113 is disposed and where the partial region Q111a is located on the active material coated region P111 side of the first main surface 1111. Similarly, the active material uncoated region Q121 of the first main surface 1211 of the positive electrode 120 has a partial region Q121a where the resin 123 is disposed and where the partial region Q121a is located on the active material coated region P121 side of the first main surface 1211.

[0079] 4, the active material uncoated region Q112 of the second main surface 1112 of the negative electrode 110 has a partial region Q112a where resin 115 is arranged and where the partial region Q112a is located on the active material coated region P112 side of the second main surface 1112. Similarly, the active material uncoated region Q122 of the second main surface 1212 of the positive electrode 120 has a partial region Q122a where resin 125 is arranged and where the partial region Q122a is located on the active material coated region P122 side of the second main surface 1212.

[0080] 6, a space S1 (first space) is formed on the partial region Q112a side between the separator 130 and first and second ends E112a, E112b in the D3 direction perpendicular to the D1 and D2 directions of the active material uncoated region Q112 of the second main surface 1112 of the negative electrode 110. Similarly, a space S2 (first space) is formed on the partial region Q122a side between the separator 130 and first and second ends E122a, E122b in the D3 direction of the active material uncoated region Q122 of the second main surface 1212 of the positive electrode 120.

[0081] With this configuration, the electrolyte solution injected through the injection hole 2h of the housing 2 can be impregnated into the interior of the stacked electrode body 100 via each space S1 and each space S2. That is, each space S1 and each space S2 can be used as a supply path for the electrolyte solution. Therefore, there is no need to provide a conduit for guiding the electrolyte solution inside the housing 2. Therefore, the stacked electrode body 100 has excellent electrolyte solution impregnation properties and can suppress a decrease in the volumetric energy density of the electricity storage module 1.

[0082] (2) As shown in FIG. 6, resin 115 arranged in partial region Q112a (FIG. 4) is in contact with the separator 130 adjacent to the separator 130 that resin 113 arranged in partial region Q111a (FIG. 3) is in contact with. Resin 125 arranged in partial region Q122a (FIG. 4) is in contact with the separator 130 adjacent to the separator 130 that resin 123 arranged in partial region Q121a (FIG. 3) is in contact with. As shown in FIGS. 4 and 6, the length of partial region Q112a in the D3 direction is shorter than the length of metal foil 111 in the D3 direction. The length of partial region Q122a in the D3 direction is shorter than the length of metal foil 121 in the D3 direction. This configuration makes it possible to form spaces S1 and S2 in the stacked electrode body 100.

[0083] (3) As described above, a space S1′ (second space) may be formed on the partial region Q111a side between the separator 130 and both ends in the D3 direction of the active material uncoated region Q111 of the first main surface 1111. Similarly, a space S2′ (second space) may be formed on the partial region Q121a side between the separator 130 and both ends in the D3 direction of the active material uncoated region Q121 of the first main surface 1211. With this configuration, in addition to the spaces S1 and S2, the spaces S1′ and S2′ can also be used as electrolyte supply paths. Therefore, a laminated electrode body 100 with this configuration has better electrolyte impregnation properties.

[0084] 4, the resin 115 allows the formation of a flow path for the electrolyte in the D2 direction (particularly, on the active material coating region P112 side) at both ends E112a, E112b in the D3 direction of the metal foil 111. Similarly, the resin 125 allows the formation of a flow path for the electrolyte in the D2 direction (particularly, on the active material coating region P122 side) at both ends E122a, E122b in the D3 direction of the metal foil 121.

[0085] Furthermore, since the resin 115 is provided on the active material coating region P112 side, a flow path for the electrolyte can be formed in the D3 direction at the end of the metal foil 111 on the D21 side. Similarly, since the resin 125 is provided on the active material coating region P122 side, a flow path for the electrolyte can be formed in the D3 direction at the end of the metal foil 121 on the D22 side.

[0086] <Modification> A laminated electrode body 100A, which is a modified example of the laminated electrode body 100, will be described.

[0087] Fig. 7 is a diagram showing a laminated electrode body 100A. As shown in Fig. 7, the laminated electrode body 100A has a plurality of negative electrodes 110A, a plurality of positive electrodes 120A, and a plurality of separators 130. In the laminated electrode body 100A, a plurality of electrodes (negative electrodes 110A, positive electrodes 120A) are alternately stacked in the D1 direction with the separators 130 interposed therebetween.

[0088] The laminated electrode body 100A further has a plurality of spacers 190 (FIGS. 8 to 11). Some of the plurality of spacers 190 are inserted between the negative electrode 110A and the separator 130. The remaining spacers 190 are inserted between the positive electrode 120A and the separator 130. One surface of each spacer 190 is in contact with the separator 130.

[0089] Thus, the laminated electrode body 100A differs from the laminated electrode body 100, which does not include spacers 190, in that it includes a plurality of spacers 190. The laminated electrode body 100A differs from the laminated electrode body 100 in that it has a negative electrode 110A instead of the negative electrode 110. The laminated electrode body 100A differs from the laminated electrode body 100 in that it has a positive electrode 120A instead of the positive electrode 120.

[0090] Fig. 8 is a view of negative electrode 110A viewed in the direction D11 in Fig. 7. In Fig. 8, since positive electrode 120A will also be described, for convenience of explanation, reference symbols indicating the respective parts and directions of positive electrode 120A are shown in parentheses.

[0091] As shown in FIG. 8, the negative electrode 110A includes a metal foil 111. As described above, the metal foil 111 has a first main surface 1111. The negative electrode 110A has a configuration similar to that of the negative electrode 110 on the first main surface 1111 side (FIG. 3). Similarly, the positive electrode 120A includes a metal foil 121. As described above, the metal foil 121 has a first main surface 1211. The positive electrode 120A has a configuration similar to that of the positive electrode 120 on the first main surface 1211 side (FIG. 3).

[0092] The length in the D3 direction of the partial region Q111a of the negative electrode 110A is equal to the length in the D3 direction of the metal foil 111. That is, as described above, the length in the D3 direction of the partial region Q111a is equal to the length in the D3 direction of the active material uncoated region Q111. Similarly, the length in the D3 direction of the partial region Q121a of the positive electrode 120A is equal to the length in the D3 direction of the metal foil 121. That is, as described above, the length in the D3 direction of the partial region Q121a is equal to the length in the D3 direction of the active material uncoated region Q121.

[0093] The active material uncoated region Q111 of the negative electrode 110A further has a first end E111a and a second end E111b. The second end E111b is located below the first end E111a. Similarly, the active material uncoated region Q121 of the positive electrode 120A further has a first end E121a and a second end E121b. The second end E121b is located below the first end E121a.

[0094] The resin 113 of the negative electrode 110A further has a first end E113a and a second end E113b. The second end E113b is located below the first end E113a. Similarly, the resin 123 of the positive electrode 120A further has a first end E123a and a second end E123b. The second end E123b is located below the first end E123a.

[0095] Some of the spacers 190 among the plurality of spacers 190 are attached to the resin 113. One surface of the spacer 190 is in contact with the resin 113, and the other surface is in contact with the separator 130. In this example, the length of the spacer 190 in the D3 direction is shorter than the length of the resin 113 in the D3 direction. The length of the spacer 190 in the D2 direction is shorter than the length of the resin 113 in the D2 direction. However, the length of the spacer 190 in the D2 direction may be the same as the length of the resin 113 in the D2 direction.

[0096] Fig. 9 is a view of negative electrode 110A viewed in the direction of D12 in Fig. 7. In Fig. 9, since positive electrode 120A will also be described, for convenience of explanation, reference symbols indicating the respective parts and directions of positive electrode 120A are shown in parentheses.

[0097] 9, as described above, the metal foil 111 has the second main surface 1112. As described above, the second main surface 1112 has an active material coated region P112 and an active material uncoated region Q112.

[0098] The active material uncoated region Q112 has a resin 115A disposed therein and a partial region Q112b located on the active material coated region P112 side of the second main surface 1112. In this example, the partial region Q111b is continuous with the active material coated region P112. Only the region of the active material uncoated region Q112 excluding the partial region Q112b is exposed on the second main surface 1112. Specifically, in FIG. 9, the metal foil 111 is exposed at the left end portion of the metal foil 111.

[0099] As described above, the active material uncoated region Q112 further has a first end E112a and a second end E112b. The resin 115A further has a first end E115a and a second end E115b. The second end E115b is located below the first end E115a. In this example, the material of the resin 115A and the material of the resin 115 are the same.

[0100] Some of the spacers 190 are attached to the resin 115A. One surface of the spacer 190 is in contact with the resin 115A, and the other surface is in contact with the separator 130. In this example, the length in the D3 direction of the spacer 190 attached to the resin 115A is shorter than the length of the resin 115A in the D3 direction. The length in the D2 direction of the spacer 190 is shorter than the length of the resin 113 in the D2 direction. However, the length in the D2 direction of the spacer 190 may be the same as the length of the resin 113 in the D2 direction.

[0101] Next, the positive electrode 120A will be described. As described above, the metal foil 121 has the second main surface 1212. As described above, the second main surface 1212 has an active material coated region P122 and an active material uncoated region Q122.

[0102] The active material uncoated region Q122 has a resin 125A disposed therein and includes a partial region Q122b located on the active material coated region P122 side of the second main surface 1212. In this example, the partial region Q122b is continuous with the active material coated region P122. On the second main surface 1212, only the region of the active material uncoated region Q122 excluding the partial region Q122b is exposed. In FIG. 9, the metal foil 121 is exposed at the left end.

[0103] As described above, the active material uncoated region Q122 further has a first end E122a and a second end E122b. The resin 125A further has a first end E125a and a second end E125b. The second end E125b is located below the first end E125a. In this example, the material of the resin 125A and the material of the resin 115 are the same.

[0104] Some of the spacers 190 among the plurality of spacers 190 are attached to the resin 123. One surface of each spacer 190 is in contact with the resin 123, and the other surface is in contact with the separator 130. Some of the spacers 190 among the plurality of spacers 190 are attached to the resin 125A. One surface of each spacer 190 is in contact with the resin 125A, and the other surface is in contact with the separator 130.

[0105] The length in the D3 direction of the partial region Q112b of the negative electrode 110A is equal to the length in the D3 direction of the metal foil 111. That is, the length in the D3 direction of the partial region Q112b is equal to the length in the D3 direction of the active material-uncoated region Q112. Similarly, the length in the D3 direction of the partial region Q122b of the positive electrode 120A is equal to the length in the D3 direction of the metal foil 121. That is, the length in the D3 direction of the partial region Q122b is equal to the length in the D3 direction of the active material-uncoated region Q122.

[0106] Fig. 10 is a view of negative electrode 110A viewed in the direction of arrow X in Fig. 8 and Fig. 9. Note that in Fig. 10, in order to also explain positive electrode 120A, reference symbols indicating the respective parts and directions of positive electrode 120A are shown in parentheses, as in Fig. 8 and the like.

[0107] 10, in the negative electrode 110A, a resin 113 is disposed on a first main surface 1111 of a metal foil 111, and an active material 112 (not shown) is applied thereto. A resin 115A and an active material 114 (not shown) are applied to a second main surface 1112 of the metal foil 111.

[0108] In the positive electrode 120A, a resin 123 is disposed on a first main surface 1211 of the metal foil 121, and an active material 122 (not shown) is applied thereto. A resin 125A is disposed on a second main surface 1212 of the metal foil 121, and an active material 124 (not shown) is applied thereto.

[0109] Fig. 11 is a cross-sectional view taken along the line XI-XI in Fig. 7. As shown in Fig. 11, in the laminated electrode body 100A, a negative electrode 110A and a positive electrode 120A are laminated in the D1 direction with a separator 130 interposed therebetween.

[0110] Furthermore, in the laminated electrode body 100A, as described above, spacers 190 are disposed between the negative electrode 110A and the separator 130. Specifically, in this example, the spacers 190 are disposed on the first main surface 1111 side of the negative electrode 110A (see FIG. 8) and on the second main surface 1112 side of the negative electrode 110A (see FIG. 9). Similarly, spacers 190 are disposed between the positive electrode 120A and the separator 130. Specifically, the spacers 190 are disposed on the first main surface 1211 side of the positive electrode 120A and on the second main surface 1212 side of the positive electrode 120A. Each spacer 190 is disposed in the center of the laminated electrode body 100A in the D3 direction.

[0111] The length of the spacer 190 in the D3 direction is shorter than the length of the negative electrode 110A in the D3 direction. The length of the spacer 190 in the D3 direction is shorter than the length of the positive electrode 120A in the D3 direction. The length of the spacer 190 in the D3 direction is shorter than the length of the metal foils 111 and 121 in the D3 direction. The length of the spacer 190 in the D3 direction is shorter than the length of each of the active material coated regions P111, P121, P112, and P122 in the D3 direction. The length of the spacer 190 in the D3 direction is shorter than the length of each of the active material uncoated regions Q111, Q121, Q112, and Q122 in the D3 direction.

[0112] Resin 113 arranged in partial region Q111a (FIG. 8) is in contact with separator 130. On the other hand, resin 115A arranged in partial region Q112b (FIG. 9) is not in contact with separator 130.

[0113] A space S3 is formed on the partial region Q112b side between the separator 130 and first and second ends E112a, E112b in the direction D3 of the active material-uncoated region Q112 (FIG. 9) of the second main surface 1112 of the negative electrode 110A. Specifically, a space S3 is formed between the first end E115a of the resin 115A and the separator 130 with which the spacer 190 is in contact. Similarly, a space S3 is formed on the partial region Q112b side between the second end E115b of the resin 115A and the separator 130 with which the spacer 190 is in contact. The two spaces S3 formed by one spacer 190 are spaced apart in the direction D3. The space S3 is a gap.

[0114] The length of the spacer 190 in the D3 direction is shorter than at least the length of the negative electrode 110A in the D3 direction, so a space S3 is formed. The spacer 190 is disposed in the center of the stacked electrode body 100A in the D3 direction, so one spacer 190 forms two spaces S3 in the D3 direction.

[0115] A space S4 is formed on the partial region Q111a side between the separator 130 and first and second ends E111a, E111b in the D3 direction of the active material-uncoated region Q111 (FIG. 8) of the first main surface 1111 of the negative electrode 110A. Specifically, the space S4 is formed between the first end E113a of the resin 113 and the separator 130 with which the spacer 190 is in contact. Similarly, a space S4 is formed on the partial region Q111a side between the second end E113b of the resin 113 and the separator 130 with which the spacer 190 is in contact. The two spaces S4 formed by one spacer 190 are spaced apart in the D3 direction, similar to the space S3. The space S4 is a gap.

[0116] The length of the spacer 190 in the D3 direction is shorter than at least the length of the negative electrode 110A in the D3 direction, so a space S4 is formed. The spacer 190 is disposed in the center of the stacked electrode body 100A in the D3 direction, so one spacer 190 forms two spaces S4 in the D3 direction.

[0117] In the laminated electrode body 100A, as shown in FIGS. 8, 9, and 10, the positive electrode 120A has a configuration similar to that of the negative electrode 110A. Furthermore, as described above, a spacer 190 is disposed between the positive electrode 120A and the separator 130. Therefore, a space similar to the spaces S3 and S4 is also formed between the positive electrode 120A and the separator 130. Note that this space is hidden in FIG. 11 and is therefore not shown.

[0118] Specifically, a space similar to space S3 (hereinafter, "space S3'") is formed on the partial region Q122b side between first and second ends E122a, E122b in the D3 direction of active material-uncoated region Q122 (FIG. 9) of second main surface 1212 of positive electrode 120A and separator 130. More specifically, space S3' is formed between first end E125a of resin 125A and separator 130 with which spacer 190 is in contact. Similarly, space S3' is formed between second end E125b of resin 125A and separator 130 with which spacer 190 is in contact.

[0119] A space similar to space S4 (hereinafter, "space S4'") is formed on the partial region Q121a side between first and second ends E121a, E121b in the D3 direction of active material-uncoated region Q121 (FIG. 8) of first main surface 1211 of positive electrode 120A and separator 130. More specifically, space S4' is formed between first end E123a of resin 123 and separator 130 with which spacer 190 is in contact. Similarly, space S4' is formed between second end E123b of resin 123 and separator 130 with which spacer 190 is in contact.

[0120] The first principal surfaces 1111, 1211 (FIG. 8) correspond to the "first surface" in this disclosure. The second principal surfaces 1112, 1212 (FIG. 9) correspond to the "second surface" in this disclosure. The active material-coated regions P111, P112, P121, P122 (FIGS. 8, 9) correspond to the "active material-coated regions" in this disclosure. The active material-uncoated regions Q111, Q112, Q121, Q122 (FIGS. 8, 9) correspond to the "active material-uncoated regions" in this disclosure.

[0121] Specifically, the active material uncoated regions Q111 and Q121 (FIG. 8) correspond to the "active material uncoated regions on the first surface" in this disclosure. The active material uncoated regions Q112 and Q122 (FIG. 9) correspond to the "active material uncoated regions on the second surface" in this disclosure.

[0122] The partial regions Q111a and Q121a (FIG. 8) correspond to the "second resin arrangement region" of the present disclosure. The partial regions Q112b and Q122b (FIG. 9) correspond to the "first resin arrangement region" of the present disclosure. The first end portions E112a and 122a (FIG. 9) and the second end portions E112b and 122b (FIG. 9) correspond to the "end portions in the third direction" of the present disclosure. The spaces S3 and S3' correspond to the "first space" of the present disclosure. The spaces S4 and S4' correspond to the "second space" of the present disclosure.

[0123] The laminated electrode body 100A can be summarized as follows.

[0124] (1) As shown in FIG. 7, in the laminated electrode body 100A, the electrodes (negative electrodes 110, positive electrodes 120) and separators 130 are alternately laminated in the direction D1 and extend in the direction D2 perpendicular to the direction D1.

[0125] 8, 9, and 10, each negative electrode 110A includes a metal foil 111 having a first main surface 1111 and a second main surface 1112 opposite to the first main surface 1111. Each positive electrode 120A includes a metal foil 121 having a first main surface 1211 and a second main surface 1212 opposite to the first main surface 1211.

[0126] 8, first main surface 1111 of negative electrode 110A has an active material-coated region P111 that extends in the D2 direction and is coated with active material 112, and an active material-uncoated region Q111 that is continuous with active material-coated region P111 in the D2 direction and is not coated with active material 112. Similarly, first main surface 1211 of positive electrode 120A has an active material-coated region P121 that extends in the D2 direction and is coated with active material 112, and an active material-uncoated region Q121 that is continuous with active material-coated region P121 in the D2 direction and is not coated with active material 112.

[0127] 9, the second main surface 1112 of the negative electrode 110A has an active material-coated region P112 that extends in the D2 direction and is coated with the active material 114, and an active material-uncoated region Q112 that is continuous with the active material-coated region P112 in the D2 direction and is not coated with the active material 114. Similarly, the second main surface 1212 of the positive electrode 120A has an active material-coated region P122 that extends in the D2 direction and is coated with the active material 114, and an active material-uncoated region Q122 that is continuous with the active material-coated region P122 in the D2 direction and is not coated with the active material 114.

[0128] 8 and 9, the active material-uncoated region Q112 of the second main surface 1112 of the negative electrode 110A is located on the back side of the active material-uncoated region Q111 of the first main surface 1111 of the metal foil 111. Similarly, the active material-uncoated region Q122 of the second main surface 1212 of the positive electrode 120A is located on the back side of the active material-uncoated region Q121 of the first main surface 1211 of the metal foil 121.

[0129] 8, the active material uncoated region Q111 of the first main surface 1111 of the negative electrode 110A has a partial region Q111a where the resin 113 is disposed and where the partial region Q111a is located on the active material coated region P111 side of the first main surface 1111. Similarly, the active material uncoated region Q121 of the first main surface 1211 of the positive electrode 120A has a partial region Q121a where the resin 123 is disposed and where the partial region Q121a is located on the active material coated region P121 side of the first main surface 1211.

[0130] 9, the active material uncoated region Q112 of the second main surface 1112 of the negative electrode 110A has a partial region Q112b where resin 115A is arranged and where it is located on the active material coated region P112 side of the second main surface 1112. Similarly, the active material uncoated region Q122 of the second main surface 1212 of the positive electrode 120A has a partial region Q122b where resin 125A is arranged and where it is located on the active material coated region P122 side of the second main surface 1212.

[0131] 11, a space S3 is formed between first and second ends E112a, E112b of active material-uncoated region Q112 of second main surface 1112 of negative electrode 110A in direction D3 perpendicular to directions D1 and D2, and separator 130. More specifically, a space S3 is formed between first and second ends E115a, E115b of resin 115A disposed in partial region Q112b of negative electrode 110A in direction D3 perpendicular to directions D1 and D2, and separator 130.

[0132] Similarly, a space S4 is formed between the separator 130 and first and second ends E122a, E122b in the D3 direction of the active material-uncoated region Q122 of the second main surface 1212 of the positive electrode 120A. More specifically, a space S4 is formed between the separator 130 and first and second ends E125a, E125b in the D3 direction of the resin 125A arranged in the partial region Q122b of the positive electrode 120A.

[0133] With this configuration, the electrolyte solution injected through the injection hole 2h of the housing 2 can be impregnated into the interior of the stacked electrode body 100A via each space S3 and each space S4. That is, each space S3 and each space S4 can be used as a supply path for the electrolyte solution. Therefore, in this modification, there is no need to provide a conduit for guiding the electrolyte solution inside the housing 2. Therefore, the stacked electrode body 100A has excellent electrolyte solution impregnation properties and can suppress a decrease in the volumetric energy density of the electricity storage module 1.

[0134] (2) A resin spacer 190 is further laminated between the resin 115A arranged in the partial region Q112b and the separator 130. This configuration makes it possible to form a space S3 in the laminated electrode body 100. Similarly, a resin spacer 190 is further laminated between the resin 125A arranged in the partial region Q122b and the separator 130. This configuration makes it possible to form a space S3' in the laminated electrode body 100.

[0135] A resin spacer 190 is further laminated between the resin 113 arranged in the partial region Q111a and the separator 130. With this configuration, a space S4 can be formed in the laminated electrode body 100. Similarly, a resin spacer 190 is further laminated between the resin 123 arranged in the partial region Q121a and the separator 130. With this configuration, a space S4' can be formed in the laminated electrode body 100.

[0136] In the above, as shown in FIG. 10, a configuration in which space S3 and space S4 are formed by providing spacers 190 on both sides of negative electrode 110A has been described as an example, but this is not limiting. Spacer 190 may be provided on only one side of negative electrode 110A. In this case, one of space S3 and space S4 is formed. Similarly, spacer 190 may be provided on only one side of positive electrode 120A. In this case, one of space S3' and space S4' is formed.

[0137] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present disclosure is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0138] 1 Energy storage module, 2 Container, 2h Inlet hole, 21 First surface, 22 Second surface, 23 Third surface, 24 Fourth surface, 25 Fifth surface, 26 Sixth surface, 27 External connection terminal, 100, 100A Laminated electrode body, 110, 110A Negative electrode, 111, 121 Metal foil, 112 Active material, 112b Second end, 113 Resin, 114 Active material, 115 Resin, 115A Resin, 120, 120A Positive electrode, 122 Active material, 123 Resin, 124 Active material, 125, 125A Resin, 130 Separator, 150 Tab, 160 Tab, 190 Spacer, 1111 First main surface, 1112 Second main surface, 1211 First main surface, 1212 Second principal surface, E111a first end, E111b second end, E112a first end, E112b second end, E113a first end, E113b second end, E115a first end, E115b second end, E121a first end, E121b second end, E122a first end, E122b second end, E123a first end, E123b second end, E125a first end, E125b second end, P111, P112, P121, P122 active material coated region, Q111, Q112, Q121, Q122 Active material uncoated area, Q111a, Q111b, Q112a, Q112b, Q121a, Q121b, Q122a, Q122b partial area, S1, S3, S4 space.

Claims

1. A laminated electrode body, A plurality of electrodes; a plurality of separators; the electrodes and the separators are alternately stacked in a first direction; the laminated electrode body extends in a second direction perpendicular to the first direction, Each of the electrodes includes a metal foil having a first surface and a second surface opposite to the first surface; each of the first surfaces and the second surfaces has an active material-coated region that extends in the second direction and is coated with an active material, and an active material-uncoated region that is continuous with the active material-coated region in the second direction and is not coated with the active material; The active material uncoated region of the second surface is the active material-uncoated region of the first surface of the metal foil is located on the back side of the active material-uncoated region of the first surface of the metal foil; a first resin-disposed region in which a resin is disposed and which is located on the active material-coated region side of the second surface; A laminated electrode body, wherein a first space is formed between the separator and an end portion of the active material uncoated region of the second surface in a third direction perpendicular to the first direction and the second direction, on the side of the first resin arrangement region.

2. the resin contacts the separator; The laminated electrode body according to claim 1 , wherein the length of the first resin distribution region in the third direction is shorter than the length of the metal foil in the third direction.

3. The laminated electrode assembly according to claim 1 , wherein a spacer made of resin is disposed between the resin and the separator.

4. the active material uncoated region of the first surface has a resin disposed therein and has a second resin disposed region located on the active material coated region side of the first surface; 2. The laminated electrode body according to claim 1, wherein a second space is formed between the separator and an end of the active material uncoated region of the first surface in the third direction on the side of the second resin arrangement region.

5. The laminated electrode body according to any one of claims 1 to 4, and a housing that houses the stacked electrode body.

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