Stacked battery and manufacturing method for the same

Abstract

To reduce the possibility of manufacturing defects occurring.SOLUTION: A stacked battery (1A) includes a plurality of current collectors (2) arranged along a predetermined direction, a plurality of electrode bodies (3) arranged between each pair of current collectors (2), and an insulating member (4) provided between the current collectors (2) and adjacent to the periphery of the electrode bodies (3). The insulating member (4) includes a first compressible material having material properties that are more compressible than those of the electrode body (3).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stacked battery and the like. [Background technology]

[0002] Stacked batteries in which current collectors and electrode assemblies are alternately stacked and vacuum-sealed are widely used. In such stacked batteries, as described in Patent Document 1, an insulating member may be provided around the electrode assemblies to prevent short circuits between adjacent current collectors and / or to position the electrode assemblies. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012-014730 Summary of the Invention [Problem to be solved by the invention]

[0004] When an insulating member is provided around the electrode assembly as in the technology described in Patent Document 1, the thickness of the insulating member needs to be equal to or less than that of the electrode assembly in order to allow contact between adjacent electrode assemblies and current collectors after vacuum sealing. However, if the thickness of the insulating member is reduced before vacuum sealing, and the electrode assembly is not flat enough, there is a risk that the electrode assembly will ride up onto the insulating member when positioned between the insulating members, causing stacking defects.

[0005] Furthermore, if the number of layers is large, the difference between the total thickness of the electrode body and the total thickness of the insulating members becomes large, which may prevent contact between the insulating members and the current collectors, making it impossible to fix adjacent current collectors with the insulating members, and may also result in the pressure applied to the ends of the electrode body when vacuum sealed, damaging the electrode body.

[0006] An object of one aspect of the present invention is to provide a stacked battery and a method for manufacturing the same that can reduce the possibility of manufacturing defects. [Means for solving the problem]

[0007] In order to solve the above problems, a stacked battery according to one embodiment of the present invention includes a plurality of current collectors arranged along a predetermined direction, a plurality of electrode bodies respectively arranged between the plurality of current collectors, and an insulating member provided between the current collectors and adjacent to the periphery of the electrode bodies, wherein the insulating member includes a first compressible material having material properties that make it more compressible than the electrode bodies.

[0008] In order to solve the above-mentioned problems, one embodiment of the present invention provides a method for manufacturing a stacked battery, which manufactures a stacked battery including a plurality of current collectors arranged along a predetermined direction, a plurality of electrode bodies respectively arranged between the plurality of current collectors, and insulating members provided adjacent to the periphery of the electrode bodies between the current collectors, the method including: a first structure fabrication step of fabricating a first structure in which the current collectors and the electrode bodies are stacked by performing at least twice a process including a first step of arranging the insulating member on a first current collector serving as the current collector, a second step of arranging the electrode body between the insulating members, and a third step of arranging a second current collector serving as the current collector on the side of the electrode body opposite the current collector side; and a vacuum sealing step of vacuum-sealing the first structure, wherein the insulating member includes a first compressible material having material properties that make it more compressible than the electrode bodies. [Effects of the Invention]

[0009] According to one aspect of the present invention, the possibility of manufacturing defects can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing the configuration of a stacked battery according to a first embodiment of the present invention. [Figure 2] 3 is a flowchart showing an example of a procedure for manufacturing the stacked battery. [Figure 3] 3A to 3C are schematic diagrams illustrating an example of a method for manufacturing the stacked battery. [Figure 4] 3A to 3C are schematic diagrams illustrating an example of a method for manufacturing the stacked battery. [Figure 5] FIG. 4 is a cross-sectional view showing the configuration of a stacked battery according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view showing the configuration of a stacked battery according to a third embodiment of the present invention. [Figure 7] 3 is a flowchart showing an example of a procedure for manufacturing the stacked battery. [Figure 8] FIG. 10 is a cross-sectional view showing the configuration of a stacked battery according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment 1] Hereinafter, one embodiment of the present invention will be described in detail.

[0012] (Configuration of stacked battery 1A) First, the configuration of the stacked battery 1A will be described. In this embodiment, the stacked battery 1A will be described as a lithium ion secondary battery.

[0013] 1 is a cross-sectional view showing the configuration of a stacked battery 1 A. As shown in FIG. 1, the stacked battery 1 A includes a current collector 2, an electrode assembly 3, an insulating member 4, and a laminate member 5.

[0014] The current collectors 2 collect electricity generated in the electrode assembly 3, which will be described later. A plurality of current collectors 2 are arranged in a predetermined direction (the vertical direction in FIG. 1). In the example shown in FIG. 1, four current collectors 2 are arranged in a stacked manner. Hereinafter, the direction in which the current collectors 2 are stacked will be referred to as the vertical direction or the first direction. To distinguish between the four current collectors 2, they may be referred to as current collector 2A (first current collector), current collector 2B (second current collector), current collector 2C (third current collector), and current collector 2D (fourth current collector) in order from bottom to top in FIG. 1. A tab (not shown) is connected to the current collector 2 to extract electricity from the current collector 2 to the outside.

[0015] The electrode body 3 includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer (not shown), and generates electricity. As shown in Fig. 1, the electrode body 3 is disposed between each of a plurality of current collectors 2. Hereinafter, to distinguish between the three electrode bodies 3, they may be referred to as electrode body 3A, electrode body 3B, and electrode body 3C in order from bottom to top in Fig. 1 in the first direction.

[0016] The positive electrode layer is not particularly limited, and any material that is used as a positive electrode active material for an all-solid-state battery can be used. The positive electrode active material may include, for example, a lithium-containing oxide containing cobalt, nickel, and / or manganese. More specifically, the positive electrode active material may be, for example, lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganate (spinel-type lithium manganate (LiMnO, etc.)), lithium nickel cobalt manganate (LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 The oxides may include oxides such as Li-rich composite oxides (Li2MnO3-LiMO2), as well as compounds other than oxides. In the above formula, M represents a transition metal. Examples of compounds other than oxides include olivine compounds (LiMPO4) and sulfur-containing compounds (Li2S, etc.).

[0017] The negative electrode layer is not particularly limited as long as it can insert and remove ions that serve as charge carriers, and any known negative electrode active material used in all-solid-state batteries can be used. More specifically, it may include carbonaceous materials such as graphite (natural graphite, artificial graphite, etc.), hard carbon, and amorphous carbon, as well as lithium metal or alloys that can alloy and dealloy lithium ions, and elemental silicon.

[0018] The solid electrolyte layer can be an ion-conductive inorganic solid electrolyte. The inorganic solid electrolyte contained in the solid electrolyte layer is preferably a sulfide (sulfide-based solid electrolyte) or a hydride (hydride-based solid electrolyte). The hydride generally includes a solid electrolyte called a complex hydride. The crystalline state of the solid electrolyte is not particularly limited and may be either crystalline or amorphous.

[0019] The insulating members 4 are provided adjacent to each of the multiple electrode bodies 3. More specifically, the insulating members 4 are provided adjacent to the periphery of the electrode body 3 between adjacent current collectors 2 in a direction perpendicular to the first direction, sandwiching both ends of the electrode body 3. The insulating members 4 are located on the current collectors 2. By providing the insulating members 4 in the stacked battery 1A, it is possible to prevent short-circuiting between the current collectors 2 and to facilitate positioning of the electrode body 3 when placing the electrode body 3 on the current collectors 2 during manufacturing of the stacked battery 1A. Hereinafter, to distinguish between the insulating members 4, they may be referred to as insulating member 4A, insulating member 4B, and insulating member 4C in order from bottom to top in FIG. 1 in the first direction. The insulating member 4 is made of a material (hereinafter referred to as a first compressible material) having material properties (e.g., rigidity) that make it more compressible than the electrode body 3. The first compressible material may be made of one or more materials selected from, for example, resin, resin sponge, rubber, ceramics, and adhesive. Examples of the resin that can be used include polyethylene terephthalate, polycarbonate, and polyether ether ketone. Examples of the resin sponge that can be used include polyurethane sponge, polyethylene sponge, silicone rubber sponge, and fluororubber sponge. Examples of the rubber that can be used include urethane rubber, nitrile rubber, silicone rubber, and fluororubber. The insulating member 4 may have an adhesive layer (in other words, a pressure-sensitive adhesive layer) at its upper end for adhering to the current collector 2.

[0020] The laminate member 5 is a film that vacuum-seals the current collector 2, the electrode body 3, and the insulating member 4. As the laminate member 5, for example, an aluminum laminate can be used.

[0021] (Manufacturing method of stacked battery 1A) Next, a method for manufacturing the stacked battery 1A will be described with reference to Figures 2 to 4. Figure 2 is a flowchart showing an example of the manufacturing procedure for the stacked battery 1A. Figures 3 and 4 are schematic views for explaining an example of the manufacturing method for the stacked battery 1A.

[0022] 2 and 3, in manufacturing the stacked battery 1A, first, two insulating members 4A are arranged on the current collector 2A (on the top surface of the current collector 2A in the example shown in FIG. 3) so as to sandwich the area where the electrode assembly 3A will be arranged in step S2 (step S1, first process). In step S1, the insulating members 4A are arranged so that the thickness of the insulating members 4A is greater than the thickness of the electrode assembly 3A arranged in step S2.

[0023] Next, the electrode body 3A is placed between the two insulating members 4A (step S2, second process). Here, as described above, the thickness of the insulating members 4A is greater than the thickness of the electrode body 3A. This reduces the possibility that the electrode body 3A will ride up onto the insulating members 4A when placing the electrode body 3A between the two insulating members 4A, making it easier to position the electrode body 3A. As a result, the possibility of stacking defects occurring can be reduced.

[0024] Next, the current collector 2B is placed on the upper surface of the insulating member 4A, in other words, on the side of the electrode body 3A opposite to the current collector 2A side (step S3, third step).

[0025] Next, two insulating members 4B are placed on the top surface of the current collector 2B so as to sandwich the region where the electrode body 3B will be placed in step S5 (step S4, first step). In step S4, the insulating members 4B are placed so that the thickness of the insulating members 4B is greater than the thickness of the electrode body 3B. Next, similar to steps S2 and S3, respectively, the electrode body 3B is placed between the two insulating members 4B (step S5, second step), and the current collector 2C is placed on the side of the electrode body 3B opposite the current collector 2B side (step S6, third step).

[0026] Next, two insulating members 4C are placed on the top surface of the current collector 2C so as to sandwich the region where the electrode body 3C will be placed in step S8 (step S7, first step). In step S7, the insulating members 4C are placed so that the thickness of the insulating members 4C is greater than the thickness of the electrode body 3C. Next, as in step S2, the electrode body 3C is placed between the two insulating members 4C (step S8, second step), and a current collector 2D is placed on the side of the electrode body 3C opposite the current collector 2C side (step S9, third step). Hereinafter, the structure fabricated by the first structure fabrication process of steps S1 to S9 will be referred to as a first structure 10 in the following description.

[0027] Next, the first structure 10 is laminated and sealed with the laminate member 5 (step S10). Next, the gas inside the laminate member 5 is evacuated to the outside of the laminate member 5, thereby creating a vacuum inside the laminate member 5 and vacuum-sealing the first structure 10 (step S11, vacuum sealing step). In step S11, by creating a vacuum inside the laminate member 5, atmospheric pressure is applied from the outside of the laminate member 5, and pressure is applied to the first structure 10 from above and below, thereby producing a stacked battery 1A.

[0028] As described above, the insulating members 4A to 4C are made of a first compressible material that has material properties that make them more compressible than the electrode assemblies 3A to 3C. Therefore, when pressure is applied from above or below the first structure 10, the insulating members 4A to 4C are compressed more than the electrode assemblies 3A to 3C. As a result, the thickness of the insulating members 4A to 4C can be easily made equal to or less than the thickness of the electrode assemblies 3A to 3C, which makes it easier to bring the insulating members 4A to 4C into contact with the current collectors 2A to 2D.

[0029] As described above, the stacked battery 1A in this embodiment includes a plurality of current collectors 2 arranged along a first direction, a plurality of electrode assemblies 3 arranged between the plurality of current collectors 2, and insulating members 4 adjacent to the plurality of electrode assemblies 3. The insulating members 4 are made of a first compressible material that has material properties that make them more compressible than the electrode assemblies 3. This allows the insulating members 4 to be compressed more than the electrode assemblies 3 during vacuum sealing. This allows the insulating members 4 to be thicker before vacuum sealing, making it easier to position the electrode assemblies 3 between the insulating members 4. As a result, the possibility of stacking defects can be reduced.

[0030] Furthermore, when the number of layers in the stacked battery 1A is increased, the difference between the total thickness of the electrode bodies 3 and the total thickness of the insulating members 4 can be reduced, which makes it easier for the insulating members 4 to come into contact with the current collectors 2, making it easier to fix adjacent current collectors 2 with the insulating members, and reducing the risk of pressure being applied to the ends of the electrode bodies 3 when vacuum-sealed.

[0031] In the stacked battery 1A of this embodiment, the insulating member 4 may be configured so that the thickness of the insulating member 4 during vacuum sealing is equal to or less than the thickness of the electrode assembly 3. This makes it possible to reduce the risk of the electrode assembly 3 coming into contact with the current collector 2 because the thickness of the insulating member 4 is equal to or less than the thickness of the electrode assembly 3 after vacuum sealing, in other words, the thickness of the electrode assembly 3 is equal to or greater than the thickness of the insulating member 4.

[0032] In the present embodiment, the stacked battery 1A has been described as a lithium-ion secondary battery, but the stacked battery 1A of the present disclosure is not limited to a lithium-ion secondary battery. The stacked battery 1A of the present disclosure may have any other configuration as long as it is a secondary battery including a plurality of current collectors, a plurality of electrode assemblies respectively disposed between the plurality of current collectors, and insulating members adjacent to the plurality of electrode assemblies.

[0033] In this embodiment, a configuration in which the stacked battery 1A includes four current collectors 2 and three electrode bodies 3 has been described, but the stacked battery of the present disclosure is not limited to this and may include five or more current collectors 2 and four or more electrode bodies 3.

[0034] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0035] 5 is a cross-sectional view showing the configuration of a stacked battery 1B according to this embodiment. As shown in FIG. 5, the stacked battery 1B includes an insulating member 6 instead of the insulating member 4 in the first embodiment.

[0036] The insulating member 6 includes a first layer 6A made of a first compressible material having material properties that make it more compressible than the electrode assembly 3, and a second layer 6B made of a second compressible material having material properties that make it less compressible than the first compressible material. The second compressible material may be made of one or more materials selected from the group consisting of resin, resin sponge, rubber, and adhesive. The upper surface of the first layer 6A contacts the current collector 2, and the lower surface of the second layer 6B contacts the current collector 2. The insulating member 6 is designed so that the thickness of the insulating member 6 and the thickness of the electrode assembly 3 are equal or nearly equal after vacuum sealing. This makes it easier for the insulating member 6 to come into contact with the current collector 2, making it easier to fix adjacent current collectors 2 with the insulating member 6.

[0037] Furthermore, in the stacked battery 1B of this embodiment, the second layer 6B, which is made of a second compression material having material properties that make it less compressible than the first compression material, is provided below the first layer 6A. In this case, in the manufacturing process, the insulating member 6 is arranged on the current collector 2 so that the first layer 6A is on top of the second layer 6B. Therefore, the second layer 6B, which is less compressible (in other words, less deformable), is arranged below the first layer 6A. This makes it easier to position the electrode body 3 when arranging it between the two insulating members 6. As a result, the possibility of stacking defects can be reduced.

[0038] [Embodiment 3] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0039] Fig. 6 is a cross-sectional view showing the configuration of a stacked battery 1C according to this embodiment. As shown in Fig. 6, the stacked battery 1C includes an exterior body 7 and a sealing part 8 that seals the opening of the exterior body 7, instead of the laminate member 5 in the first embodiment, and is a battery that is inserted into the exterior body 7 when in use.

[0040] In this embodiment, the insulating member 4 is configured so that the thickness of the insulating member 4 and the thickness of the electrode body 3 are equal or nearly equal to each other due to the pressure applied when the first structure 10 as a stacked battery is inserted into the outer casing 7.

[0041] Next, a method for manufacturing the stacked battery 1C will be described with reference to Fig. 7. Fig. 7 is a flowchart showing an example of the procedure for manufacturing the stacked battery 1C. As shown in Fig. 7, steps S1 to S9 for fabricating the first structure 10 are the same as those described in the first embodiment, and therefore description thereof will be omitted.

[0042] In manufacturing the stacked battery 1C, the first structure 10 manufactured in steps S1 to S9 is inserted into the exterior body 7 (step S21). In step S21, pressure is applied to the first structure 10 by the inner surface of the exterior body 7. This applies pressure to the first structure 10 from above and below. Next, the opening of the exterior body 7 is sealed with the sealing portion 8 (step S22). This completes the manufacturing of the stacked battery 1C.

[0043] As described above, the insulating member 4 is configured so that the thickness of the insulating member 4 becomes equal to or nearly equal to the thickness of the electrode assembly 3 due to the pressure applied when the first structure 10 is inserted into the exterior body 7. As a result, after the first structure 10 is inserted into the exterior body 7 in step S21, the thickness of the insulating member 4 becomes equal to or nearly equal to the thickness of the electrode assembly 3, which makes it easier for the insulating member 4 and the current collector 2 to come into contact with each other, making it easier to fix adjacent current collectors 2 to the insulating member 4.

[0044] [Embodiment 4] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0045] 8 is a cross-sectional view showing the configuration of a stacked battery 1D according to this embodiment. As shown in Fig. 8, the stacked battery 1D includes an insulating member 9 instead of the insulating member 4 in the third embodiment.

[0046] The insulating member 9 includes a first layer 9A made of a first compressible material having material properties that make it more compressible than the electrode assembly 3, and a second layer 9B made of a third compressible material having material properties different in compressibility from the first compressible material. The third compressible material may be made of one or more materials selected from, for example, resin, resin sponge, rubber, and adhesive. The upper surface of the first layer 9A contacts the current collector 2, and the lower surface of the second layer 9B contacts the current collector 2. The insulating member 9 is configured so that the thickness of the insulating member 9 and the thickness of the electrode assembly 3 become equal or nearly equal due to the pressure applied when the first structure as a stacked battery is inserted into the outer casing 7. As a result, the thicknesses of the insulating member 9 and the electrode assembly 3 become equal or nearly equal after insertion into the outer casing 7, which facilitates contact between the insulating member 9 and the current collector 2 and makes it easier for the insulating member 9 to fix adjacent current collectors 2.

[0047] Furthermore, in the stacked battery 1D of this embodiment, the third compression material may be less compressible than the first compression material. This allows the second layer 9B, which is less deformable than the first layer 9A, to be fabricated below the first layer 9A during manufacturing. This makes it easier to position the electrode body 3 when arranging it between the two insulating members 9. As a result, the possibility of stacking defects can be reduced.

[0048] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0049] 〔summary〕 A stacked battery according to a first aspect of the present disclosure includes a plurality of current collectors arranged along a predetermined direction, a plurality of electrode bodies respectively arranged between the plurality of current collectors, and an insulating member disposed between the current collectors and adjacent to the periphery of the electrode bodies, the insulating member including a first compressible material having material properties that make it more compressible than the electrode bodies.

[0050] A stacked battery according to aspect 2 of the present disclosure may be configured in the above-mentioned aspect 1 such that the insulating member has a thickness equal to or less than the thickness of the electrode body due to the pressure applied during vacuum sealing.

[0051] A stacked battery according to a third aspect of the present disclosure is the same as that of the first aspect, wherein the insulating member includes a first layer including the first compression material and a second layer including a second compression material having material properties different in compressibility from the first compression material, and the insulating member is configured such that the thickness of the insulating member and the thickness of the electrode body are equal or nearly equal to each other after vacuum sealing.

[0052] A stacked battery according to a fourth aspect of the present disclosure may be configured such that, in the first aspect described above, the stacked battery is used by being inserted into an outer casing, and the insulating member is configured such that the thickness of the insulating member and the thickness of the electrode body become equal or nearly equal to each other due to the pressure applied when the stacked battery is inserted into the outer casing.

[0053] A stacked battery according to a fifth aspect of the present disclosure is the stacked battery of the first aspect, wherein the stacked battery is used by being housed in an exterior body; The insulating member may include a first layer including the first compression material and a second layer including a third compression material having material properties different in compressibility from the first compression material, and the insulating member may be configured such that the thickness of the insulating member and the thickness of the electrode body become equal or nearly equal to each other due to the pressure applied when the stacked battery is inserted into the outer casing.

[0054] A stacked battery according to a sixth aspect of the present disclosure may be configured such that, in any one of the first to fifth aspects, the first compression material is composed of one or more materials selected from resin, resin sponge, rubber, and adhesive.

[0055] A manufacturing method for a stacked battery according to a seventh aspect of the present disclosure is a manufacturing method for a stacked battery including a plurality of current collectors arranged along a predetermined direction, a plurality of electrode bodies respectively arranged between the plurality of current collectors, and an insulating member arranged adjacent to the periphery of the electrode bodies between the current collectors, the manufacturing method for a stacked battery including a first structure manufacturing step of manufacturing a first structure in which the current collectors and the electrode bodies are stacked by performing at least twice a process including a first step of arranging the insulating member on a first current collector as the current collector, a second step of arranging the electrode body between the insulating members, and a third step of arranging a second current collector as the current collector on the opposite side of the electrode body from the current collector side, and a vacuum sealing step of vacuum sealing the first structure, wherein the insulating member includes a first compressible material having material properties that make it easier to compress than the electrode bodies.

[0056] A stacked battery according to an eighth aspect of the present disclosure may be configured such that, in the seventh aspect, the insulating member includes a first layer including the first compression material and a second layer including a third compression material having material properties that make it less compressible than the first compression material, and in the first step, the second layer is positioned closer to the current collector than the first layer. [Explanation of symbols]

[0057] 1A, 1B, 1C, 1D stacked battery 2, 2A, 2B, 2C, 2D Current collector 3, 3A, 3B, 3C electrode body 4, 4A, 4B, 4C, 6, 9 Insulating material 5 Laminated materials 6A, 9A 1st layer 6B, 9B 2nd layer 7. Exterior body 10 First structure

Claims

1. A plurality of current collectors arranged along a predetermined direction; a plurality of electrode bodies respectively disposed between the plurality of current collectors; an insulating member provided adjacent to the periphery of the electrode body between the current collectors, The insulating member includes a first compressible material having material properties that make it more compressible than the electrode assembly.

2. 2. The stacked battery according to claim 1, wherein the insulating member is configured so that the thickness of the insulating member is equal to or less than the thickness of the electrode assembly due to pressure applied during vacuum sealing.

3. the insulating member includes a first layer including the first compressible material and a second layer including a second compressible material having material properties different in compressibility from the first compressible material; 2. The stacked battery according to claim 1, wherein the insulating member is configured so that the thickness of the insulating member and the thickness of the electrode body are equal or approximately equal to each other after vacuum sealing.

4. The laminated battery is used by being housed in an exterior case, 2. The stacked battery according to claim 1, wherein the insulating member is configured so that a thickness of the insulating member and a thickness of the electrode body become equal or approximately equal to each other due to pressure applied when the stacked battery is inserted into the exterior body.

5. The laminated battery is used by being housed in an exterior case, the insulating member includes a first layer including the first compressible material and a second layer including a third compressible material having material properties different in compressibility from the first compressible material; 2. The stacked battery according to claim 1, wherein the insulating member is configured so that a thickness of the insulating member and a thickness of the electrode body become equal or approximately equal to each other due to pressure applied when the stacked battery is inserted into the exterior body.

6. 2. The stacked battery according to claim 1, wherein the first compressible material is made of one or more materials selected from the group consisting of resin, resin sponge, rubber, and adhesive.

7. A method for manufacturing a stacked battery, the method comprising: manufacturing a stacked battery including a plurality of current collectors arranged along a predetermined direction; a plurality of electrode bodies respectively arranged between the plurality of current collectors; and insulating members provided adjacent to and around the electrode bodies between the current collectors, a first structure fabrication step of fabricating a first structure in which the current collectors and the electrode bodies are stacked by performing at least twice a step including: a first step of arranging the insulating member on a first current collector serving as the current collector; a second step of arranging the electrode body between the insulating members; and a third step of arranging a second current collector serving as the current collector on the side of the electrode body opposite to the current collector side; a vacuum sealing step of vacuum-sealing the first structure, The insulating member includes a first compressible material having material properties that make it more compressible than the electrode assembly.

8. the insulating member includes a first layer including the first compressible material and a second layer including a third compressible material having material properties that make it less compressible than the first compressible material; The method for manufacturing a stacked battery according to claim 7 , wherein in the first step, the second layer is disposed closer to the current collector than the first layer.

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