Battery

Abstract

To solve the problem in which: in a prior art, reduction in a possibility of coming off of an active material is demanded.SOLUTION: A battery comprises a first electrode layer, and a second electrode layer stacked on the first electrode layer. The first electrode layer includes a first collector and a first active material layer. The second electrode layer includes a second collector and a second active material layer. The first active material layer is in contact with the first collector and arranged in a range narrower than the first collector. A first solid electrolyte layer is arranged in contact with the first collector and the first active material layer. The first active material layer faces the second electrode layer with the first solid electrolyte layer therebetween. A shape of the first electrode layer is a polygonal shape having a plurality of corner parts. At least one of the plurality of corner parts is provided with a first round part. A shape of the first active material layer is a polygonal shape having a plurality of corner parts. A corner part adjacent to the first round part, of the corner parts of the first active material layer, is provided with a round part. In plan view, the battery has an area where the first and second collectors overlap each other, and an area where the collectors do not overlap each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] Patent Document 1 discloses a battery in which a current collector, a positive electrode, a solid electrolyte, and a negative electrode are all in the same circular thin plate shape.

[0003] Patent Document 2 discloses a coin-type battery in which the end of the positive electrode current collector and the end of the positive electrode active material layer are covered with a solid electrolyte layer.

[0004] Patent Document 3 discloses a battery in which the corners of the positive electrode, negative electrode, and electrolyte layer are rounded. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-056067 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-229315 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-149994 Summary of the Invention [Problem to be solved by the invention]

[0006] In the prior art, it is desirable to reduce the possibility of active material falling off. [Means for solving the problem]

[0007] A battery according to one embodiment of the present disclosure includes a first electrode layer and a second electrode layer stacked on the first electrode layer and serving as a counter electrode of the first electrode layer. The first electrode layer includes a first current collector, a first active material layer, and a first solid electrolyte layer. The first active material layer is in contact with the first current collector and is disposed over an area smaller than the first current collector. The first solid electrolyte layer is in contact with the first current collector and the first active material layer and is disposed over the same area as the first current collector. The first active material layer faces the second electrode layer with the first solid electrolyte layer interposed therebetween. The first electrode layer has a first rounded portion on its outer periphery. [Effects of the Invention]

[0008] According to the present disclosure, the possibility of the active material falling off can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a battery 1000 according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing a schematic configuration of the battery 1100 according to the first embodiment. [Figure 3] FIG. 3 is a diagram showing a schematic configuration of the battery 1200 according to the first embodiment. [Figure 4] FIG. 4 is a diagram showing a schematic configuration of the battery 1300 according to the first embodiment. [Figure 5] FIG. 5 is an xy diagram (top perspective view) showing another example of the shape of the first current collector 110 and the first active material layer 120. In FIG. [Figure 6] FIG. 6 is a diagram showing a schematic configuration of the battery 1400 according to the first embodiment. [Figure 7] FIG. 7 is a diagram showing a schematic configuration of a battery 1500 according to the first embodiment. [Figure 8] FIG. 8 is a diagram showing a schematic configuration of the battery 1600 according to the first embodiment. [Figure 9] FIG. 9 is a diagram showing a schematic configuration of a battery 1700 according to the first embodiment. [Figure 10]FIG. 10 is a diagram showing a schematic configuration of a battery 2000 according to the second embodiment. [Figure 11] FIG. 11 is a diagram showing a schematic configuration of a battery 2100 according to the second embodiment. [Figure 12] FIG. 12 is a diagram showing a schematic configuration of a battery 2200 according to the second embodiment. [Figure 13] FIG. 13 is a diagram showing a schematic configuration of a battery 2300 according to the second embodiment. [Figure 14] FIG. 14 is a diagram showing a schematic configuration of a battery 3000 according to the third embodiment. [Figure 15] FIG. 15 is a diagram showing a schematic configuration of a battery 3100 according to the third embodiment. [Figure 16] FIG. 16 is a diagram showing a schematic configuration of a battery 3200 according to the third embodiment. [Figure 17] FIG. 17 is a diagram showing a schematic configuration of a battery 4000 according to the fourth embodiment. [Figure 18] FIG. 18 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 4100 according to the fourth embodiment. [Figure 19] FIG. 19 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 4200 according to the fourth embodiment. [Figure 20] FIG. 20 is a diagram showing a schematic configuration of a battery 5000 according to the fifth embodiment. [Figure 21] FIG. 21 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 5100 according to the fifth embodiment. [Figure 22] FIG. 22 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 5200 according to the fifth embodiment. [Figure 23] FIG. 23 is a diagram showing a schematic configuration of a battery manufacturing apparatus 6000 according to the sixth embodiment. [Figure 24] FIG. 24 is a flowchart showing a battery manufacturing method according to the sixth embodiment. [Figure 25] FIG. 25 is a diagram showing an example of the first active material layer forming step S1110 and the first solid electrolyte layer forming step S1120. [Figure 26] FIG. 26 is a diagram showing an example of the second active material layer forming step S1210 and the second solid electrolyte layer forming step S1220. [Figure 27] FIG. 27 is a diagram showing an example of the laminating step S1310. [Figure 28] FIG. 28 is a flowchart showing a modification of the battery manufacturing method according to the sixth embodiment. [Figure 29] FIG. 29 is a diagram showing a schematic configuration of a battery manufacturing apparatus 6100 according to the sixth embodiment. [Figure 30] FIG. 30 is a flowchart showing a modification of the battery manufacturing method according to the sixth embodiment. [Figure 31] FIG. 31 is a diagram showing an example of the first solid electrolyte layer forming step S1121 and the first electrode side cutting step S1122. [Figure 32] FIG. 32 is a diagram showing an example of the second solid electrolyte layer forming step S1221 and the second electrode side cutting step S1222. [Figure 33] FIG. 33 is a diagram showing a schematic configuration of a battery manufacturing apparatus 7000 according to the seventh embodiment. [Figure 34] FIG. 34 is a flowchart showing a battery manufacturing method according to the seventh embodiment. [Figure 35] FIG. 35 is a diagram showing an example of the first active material layer forming step S2110 and the first solid electrolyte layer forming step S2120. [Figure 36] FIG. 36 is a diagram showing an example of the second active material layer forming step S2210 and the second solid electrolyte layer forming step S2220. [Figure 37] FIG. 37 is a diagram showing an example of the laminating step S2310. [Figure 38] FIG. 38 is a diagram showing an example of the cutting step S2510. [Figure 39] FIG. 39 is a flowchart showing a modification of the battery manufacturing method according to the seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] (Embodiment 1) FIG. 1 is a diagram showing a schematic configuration of a battery 1000 according to the first embodiment.

[0012] FIG. 1(a) is an xz view (cross-sectional view taken along line 1A) showing a schematic configuration of a battery 1000 according to the first embodiment.

[0013] FIG. 1(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1000 according to the first embodiment.

[0014] The battery 1000 in the first embodiment includes a first electrode layer 100 and a second electrode layer 200.

[0015] The second electrode layer 200 is stacked on the first electrode layer 100. The second electrode layer 200 is a layer that serves as a counter electrode to the first electrode layer 100.

[0016] The first electrode layer 100 includes a first current collector 110, a first active material layer 120, and a first solid electrolyte layer .

[0017] The first active material layer 120 is disposed in contact with the first current collector 110 and has an area smaller than that of the first current collector 110 .

[0018] The first solid electrolyte layer 130 is in contact with the first current collector 110 and the first active material layer 120 and is disposed in the same area as the first current collector 110 .

[0019] The first active material layer 120 faces the second electrode layer 200 with the first solid electrolyte layer 130 interposed therebetween.

[0020] A first rounded portion 140 is provided on the outer periphery of the first electrode layer 100.

[0021] The above configuration reduces the possibility of the active material falling off. Specifically, by using the first electrode layer 100 having an outer periphery where the first rounded portion 140 is provided, stress concentration can be reduced (e.g., impact force can be dispersed) at the outer periphery where the first rounded portion 140 is provided in the laminate of the first current collector 110 and the first solid electrolyte layer 130. This reduces the possibility of the first solid electrolyte layer 130 separating from the first current collector 110 (or the solid electrolyte collapsing from the first current collector 110) at the outer periphery where the first rounded portion 140 is provided. Therefore, the first active material layer 120 can be covered with the first solid electrolyte layer 130, which is less likely to peel off from the first current collector 110. This reduces damage to the first active material layer 120, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the first solid electrolyte layer 130 can reduce the possibility that the active material will fall off from the first active material layer 120. This can prevent short circuits inside the battery that may occur due to the active material that has fallen off from layer 120 moving inside the battery, thereby improving the reliability of the battery.

[0022] Furthermore, with the above configuration, the first active material layer 120 is covered with the first solid electrolyte layer 130, which is difficult to peel off from the first current collector 110, and therefore, even if the first active material layer 120 is disposed close to the outer periphery of the first current collector 110, the active material can be prevented from falling off from the first active material layer 120. Therefore, the first active material layer 120 can be disposed over as large an area as possible within an area narrower than the first current collector 110. This can increase the energy density of the battery.

[0023] In the present disclosure, "the solid electrolyte layer is disposed in the same area as the current collector" means "the solid electrolyte layer is disposed in substantially the same area as the current collector, excluding errors that inevitably occur in manufacturing" (for example, the solid electrolyte layer is disposed so as to have substantially the same shape as the current collector, excluding errors that inevitably occur in manufacturing).

[0024] As shown in FIG. 1, the second electrode layer 200 may include a second current collector 210, a second active material layer 220, and a second solid electrolyte layer 230.

[0025] The second active material layer 220 is a layer disposed in contact with the second current collector 210 .

[0026] The second solid electrolyte layer 230 is a layer disposed in contact with the second active material layer 220.

[0027] The second active material layer 220 faces the first active material layer 120 with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 interposed therebetween.

[0028] According to the above configuration, the possibility of contact between the first current collector 110 and the second current collector 210 can be reduced. That is, the facing portions of the first current collector 110 and the second current collector 210 can be fixed by the first solid electrolyte layer 130 and the second solid electrolyte layer 230. For example, even if the first current collector 110 and the second current collector 210 are configured as thin films, the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can maintain the distance between the first current collector 110 and the second current collector 210 at a certain distance or more (for example, at least the thickness of the first solid electrolyte layer 130 and the second solid electrolyte layer 230). Therefore, the first current collector 110 and the second current collector 210 can be prevented from coming close to each other. As a result, for example, even when a plurality of battery cells are stacked, deformation of the first current collector 110 and the second current collector 210 can be prevented. Therefore, for example, even when a plurality of battery cells are stacked, it is possible to prevent a short circuit between the first current collector 110 and the second current collector 210. Furthermore, for example, even in an all-solid-state battery that does not have a separator between the first electrode layer 100 and the second electrode layer 200, it is possible to reduce the risk of a short circuit caused by direct contact between the first current collector 110 and the second current collector 210.

[0029] Furthermore, the above configuration eliminates the need for a separate member (for example, an insulating spacer) to insulate the first electrode layer 100 and the second electrode layer 200. This makes it possible to further simplify the battery manufacturing process and reduce costs.

[0030] The first solid electrolyte layer 130 and the second solid electrolyte layer 230 may be bonded to each other.

[0031] According to the above configuration, by providing a solid electrolyte layer formed by bonding the first solid electrolyte layer 130 and the second solid electrolyte layer 230, it is possible to reduce the possibility of short circuits caused by pinholes that may occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230 during manufacturing, for example. More specifically, a bonding interface formed by bonding the first solid electrolyte layer 130 and the second solid electrolyte layer 230 to each other is provided in the region where the first active material layer 120 and the second active material layer 220 face each other. In this case, the positions of pinholes that occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230 are not the same as each other, because the first solid electrolyte layer 130 and the second solid electrolyte layer 230 are formed by different manufacturing processes. Therefore, pinholes that occur in the first solid electrolyte layer 130 are blocked by the second solid electrolyte layer 230 at the bonding interface. Furthermore, pinholes that occur in the second solid electrolyte layer 230 are blocked by the first solid electrolyte layer 130 at the bonding interface. This reduces the possibility of short circuits caused by pinholes that may occur in the solid electrolyte layers.

[0032] 1, a partial region of the main surface of the first solid electrolyte layer 130 (e.g., more than half of the main surface) and the entire main surface of the second solid electrolyte layer 230 may be bonded to each other. Alternatively, a partial region of the main surface of the first solid electrolyte layer 130 (e.g., more than half of the main surface) and the entire main surface of the second solid electrolyte layer 230 may be bonded to each other. Alternatively, the entire main surface of the first solid electrolyte layer 130 and the entire main surface of the second solid electrolyte layer 230 may be bonded to each other.

[0033] The first active material layer 120 is a layer containing an electrode material (for example, an active material).

[0034] The second active material layer 220 is a layer containing a counter electrode material (for example, an active material). The counter electrode material is a material that constitutes a counter electrode of the electrode material.

[0035] The first solid electrolyte layer 130 and the second solid electrolyte layer 230 are solid electrolyte layers containing a solid electrolyte.

[0036] The first active material layer 120 may be a negative electrode active material layer. In this case, the electrode material is a negative electrode active material. The first current collector 110 is a negative electrode current collector. The first solid electrolyte layer 130 is a negative electrode-side solid electrolyte layer. The second active material layer 220 is a positive electrode active material layer. The counter electrode material is a positive electrode active material. The second current collector 210 is a positive electrode current collector. The second solid electrolyte layer 230 is a positive electrode-side solid electrolyte layer.

[0037] Alternatively, the first active material layer 120 may be a positive electrode active material layer. In this case, the electrode material is a positive electrode active material. The first current collector 110 is a positive electrode current collector. The first solid electrolyte layer 130 is a positive electrode-side solid electrolyte layer. The second active material layer 220 is a negative electrode active material layer. The counter electrode material is a negative electrode active material. The second current collector 210 is a negative electrode current collector. The second solid electrolyte layer 230 is a negative electrode-side solid electrolyte layer.

[0038] A commonly known positive electrode current collector can be used as the positive electrode current collector. The positive electrode current collector may be, for example, a metal foil. Examples of materials that can be used for the positive electrode current collector include aluminum, copper, stainless steel, nickel, platinum, gold, and alloys containing these metals.

[0039] The positive electrode active material layer is a layer containing a positive electrode active material.

[0040] As the positive electrode active material, a generally known positive electrode active material can be used. When the battery 1000 of the first embodiment is configured as a lithium ion secondary battery (storage battery), the positive electrode active material may be a compound having the property of absorbing and releasing Li. For example, the positive electrode active material may be a compound containing lithium. For example, the positive electrode active material may be LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiMnPO4, LiFePO4, LiNiPO4, or a compound obtained by substituting one or two different elements for the transition metal of these compounds (for example, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, LiNi 0.8 Co 0.15 Al 0.05 O2, LiNi 0.5 Mn 1.5 O2, etc.), etc. may be used.

[0041] The positive electrode active material layer may be a positive electrode mixture layer containing a positive electrode active material and other materials. That is, the positive electrode active material layer may be a layer containing a mixture of a positive electrode active material and a solid electrolyte. Alternatively, the positive electrode active material layer may contain a conductive additive or a binder in addition to the positive electrode active material and the solid electrolyte.

[0042] The positive electrode active material layer may be composed of multiple layers. For example, the positive electrode active material layer may have a first layer on the side in contact with the positive electrode current collector. In this case, the positive electrode active material layer may have a second layer on the side in contact with the positive electrode solid electrolyte layer. In this case, the first layer and the second layer may have different configurations (shape, thickness, contained materials) from each other.

[0043] The positive electrode side solid electrolyte layer is a layer containing a positive electrode side solid electrolyte.

[0044] A generally known solid electrolyte can be used as the positive electrode solid electrolyte. When the battery 1000 of the first embodiment is configured as a lithium ion secondary battery (storage battery), the solid electrolyte may be a compound containing lithium. For example, the solid electrolyte may be Li3Zr2Si2PO 12, Li7La3Zr2O 12 , Li5La3Ta2O 12 , Li 1+x Al x Ti 2-x (PO4)3, Li 1.5 Ti 1.7 Al 0.8 P 2.8 Si 0.2 O 12 , La 2 / 3-x Li 3x TiO3, Li2S-SiS2-based glass and glass ceramics, Li2S-B2S3-based glass and glass ceramics, Li2S-P2S5-based glass and glass ceramics, Li 3.25 Ge 0.25 P 0.75 S4, Li 10 GeP2S 12 , etc. can be used. In addition to these, LiI, Li x MO y (M: P, Si, Ge, B, Al, Ga, or In; x, y: natural numbers) or the like may be added as an additive. As the solid electrolyte, an inorganic solid electrolyte (a sulfide-based solid electrolyte or an oxide-based solid electrolyte) or a polymer solid electrolyte (for example, a lithium salt dissolved in polyethylene oxide) may be used.

[0045] The positive electrode-side solid electrolyte layer may be made of a polymer electrolyte or a mixture of an inorganic solid electrolyte and a binder. The solid electrolyte material and binder material used in the positive electrode-side solid electrolyte layer and the positive electrode active material layer may be the same material.

[0046] A commonly known negative electrode current collector can be used as the negative electrode current collector. The negative electrode current collector may be, for example, a metal foil. Examples of the negative electrode current collector that can be used include aluminum, copper, stainless steel, nickel, platinum, gold, and alloys containing these metals.

[0047] The negative electrode active material layer is a layer containing a negative electrode active material.

[0048] As the negative electrode active material, a generally known negative electrode active material can be used. When the battery 1000 of the first embodiment is configured as a lithium ion secondary battery (storage battery), the negative electrode active material may be a compound having the property of absorbing and releasing Li. For example, the negative electrode active material may be a metal compound or a carbon material. For example, the negative electrode active material may be metallic indium, metallic lithium, a carbon material (e.g., graphite, hard carbon, etc.), Li4Ti5O 12 , Si, SiO, Sn, SnO, etc. can be used.

[0049] The negative electrode active material layer may be a negative electrode mixture layer containing a negative electrode active material and other materials. That is, the negative electrode active material layer may be a layer containing a mixture of a negative electrode active material and a solid electrolyte. Alternatively, the negative electrode active material layer may contain a conductive additive or a binder in addition to the negative electrode active material and the solid electrolyte. When the negative electrode active material layer is formed of a foil-shaped metal that can be alloyed with lithium, the solid electrolyte may not be mixed in.

[0050] The negative electrode solid electrolyte layer is a layer containing a negative electrode solid electrolyte.

[0051] The negative electrode active material layer may be composed of multiple layers. For example, the negative electrode active material layer may have a first layer on the side in contact with the negative electrode current collector. In this case, the negative electrode active material layer may have a second layer on the side in contact with the negative electrode solid electrolyte layer. In this case, the first layer and the second layer may have different configurations (shape, thickness, contained materials) from each other.

[0052] As the anode-side solid electrolyte, a generally known solid electrolyte can be used. As the anode-side solid electrolyte, the above-mentioned materials that can be used as the cathode-side solid electrolyte can be used.

[0053] The negative electrode solid electrolyte layer may be made of a polymer electrolyte or a mixture of an inorganic solid electrolyte and a binder. The solid electrolyte material and binder material used in the negative electrode solid electrolyte layer and the negative electrode active material layer may be the same material.

[0054] As the conductive additive, a carbon material (for example, acetylene black, ketjen black, carbon nanotubes, etc.), a metal powder, or the like can be used.

[0055] The binder may be a commonly known polymer compound, such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), rubber-based resin, or elastomer.

[0056] The positive electrode side solid electrolyte layer and the negative electrode side solid electrolyte layer may contain solid electrolytes of the same material or different materials.

[0057] The positive electrode solid electrolyte layer and the negative electrode solid electrolyte layer may contain the solid electrolyte at the same content (concentration) or at different contents (concentrations).

[0058] The thicknesses of the positive electrode side solid electrolyte layer and the negative electrode side solid electrolyte layer may be the same or different.

[0059] 1, the entire negative electrode current collector may be positioned parallel to the positive electrode current collector. That is, the distance between the positive electrode current collector and the negative electrode current collector may be constant throughout the entire film formation region. Alternatively, a portion of the negative electrode current collector may be positioned parallel to the positive electrode current collector.

[0060] As shown in FIG. 1, the shape of the first electrode layer 100 (that is, the shape of the first current collector 110 and the first solid electrolyte layer 130) may have corners.

[0061] In this case, a first rounded portion 140 may be provided at the corner portion of the first electrode layer 100.

[0062] The above configuration further reduces the possibility of the active material falling off. That is, stress concentration can be reduced (e.g., impact force can be dispersed) at the corners where the first rounded portions 140 are provided in the laminate of the first current collector 110 and the first solid electrolyte layer 130. This reduces the possibility of the first solid electrolyte layer 130 separating from the first current collector 110 (or the solid electrolyte collapsing from the first current collector 110) at the corners where the first rounded portions 140 are provided. Therefore, the first active material layer 120 can be covered with the first solid electrolyte layer 130, which is less likely to peel off from the first current collector 110. This reduces damage transmitted to the first active material layer 120, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the first solid electrolyte layer 130 reduces the possibility of the active material falling off from the first active material layer 120. Therefore, the active material that has fallen off from the first active material layer 120 moves inside the battery, and the internal This can prevent short circuits in the battery, thereby further improving the reliability of the battery.

[0063] Furthermore, with the above configuration, the first active material layer 120 is covered with the first solid electrolyte layer 130, which is less likely to peel off from the first current collector 110, so that even if the first active material layer 120 is disposed close to a corner of the first current collector 110, the active material can be prevented from falling off from the first active material layer 120. Therefore, the first active material layer 120 can be disposed over as large an area as possible within an area narrower than the first current collector 110. This can further increase the energy density of the battery.

[0064] In the present disclosure, the term "shape of a predetermined layer" encompasses the meaning of "shape of a predetermined layer in the direction of the principal surface (xy plane direction)."

[0065] FIG. 2 is a diagram showing a schematic configuration of the battery 1100 according to the first embodiment.

[0066] FIG. 2(a) is an xz diagram (cross-sectional view taken along line 2A) showing a schematic configuration of the battery 1100 according to the first embodiment.

[0067] FIG. 2(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1100 according to the first embodiment.

[0068] In the battery 1100 according to the first embodiment, the first rounded portion 140 is a portion formed by cutting a corner of the first electrode layer 100 in a straight line.

[0069] As described above, in the present disclosure, the term "rounded portion" (e.g., first rounded portion 140, second rounded portion 240, rounded portion of an active material layer) encompasses both the meaning of "a portion cut in a curved line" (i.e., a portion with a radius) as shown in FIG. 1 and the meaning of "a portion cut in a straight line" (i.e., a portion having an angle of 90 degrees or more) as shown in FIG. 2.

[0070] FIG. 3 is a diagram showing a schematic configuration of the battery 1200 according to the first embodiment.

[0071] FIG. 3(a) is an xz diagram (cross-sectional view taken along line 3A) showing a schematic configuration of the battery 1200 in the first embodiment.

[0072] FIG. 3(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1200 according to the first embodiment.

[0073] The battery 1200 according to the first embodiment further comprises the following components in addition to the components of the battery 1000 according to the first embodiment described above.

[0074] That is, in the battery 1200 according to the first embodiment, the shape of the first electrode layer 100 is a polygonal shape having a plurality of corners (for example, a triangular shape, a quadrangular shape, a rectangular shape, etc.).

[0075] At this time, first rounded portions 140 are provided at all of the multiple corner portions of the first electrode layer 100. For example, in the example shown in Fig. 3, first rounded portion 140a, first rounded portion 140b, first rounded portion 140c, and first rounded portion 140d are provided at all of the four corner portions of the rectangular first electrode layer 100.

[0076] According to the above-described configuration, the possibility of the active material falling off can be further reduced. That is, the concentration of stress at all corners of the laminate of the first current collector 110 and the first solid electrolyte layer 130 can be reduced. This can reduce the impact (e.g., disperse the impact force). This reduces the possibility of the first solid electrolyte layer 130 separating from the first current collector 110 (or the solid electrolyte collapsing from the first current collector 110) at all corners where the first rounded portions 140 are provided. Therefore, the first active material layer 120 can be covered with the first solid electrolyte layer 130, which is less likely to peel off from the first current collector 110. This reduces damage to the first active material layer 120, for example, even when a corner impact occurs during battery manufacturing or use. In other words, the first solid electrolyte layer 130 reduces the possibility of the active material falling off from the first active material layer 120. This prevents a short circuit within the battery, which can occur when the active material falling off from the first active material layer 120 moves inside the battery. This further improves the reliability of the battery.

[0077] Furthermore, with the above configuration, the first active material layer 120 is covered with the first solid electrolyte layer 130, which is not easily peeled off from the first current collector 110. This prevents the active material from falling off from the first active material layer 120 even when the first active material layer 120 is disposed close to all corners of the first current collector 110. This allows the first active material layer 120 to be disposed over as large an area as possible within an area narrower than the first current collector 110. This further increases the energy density of the battery.

[0078] Furthermore, according to the above configuration, by using the polygonal first electrode layer 100, when multiple batteries according to the first embodiment are arranged side by side, they can be arranged more densely. That is, compared to a configuration using a circular first electrode layer 100 (for example, a coin-type battery), a configuration using a polygonal first electrode layer 100 (for example, a prismatic battery) can reduce gaps when multiple batteries are arranged in a planar direction. This makes it possible to further increase the energy density of a battery module (or a battery pack) formed by arranging multiple batteries.

[0079] FIG. 4 is a diagram showing a schematic configuration of the battery 1300 according to the first embodiment.

[0080] FIG. 4(a) is an xz diagram (cross-sectional view taken along line 4A) showing a schematic configuration of the battery 1300 in the first embodiment.

[0081] FIG. 4(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1300 according to the first embodiment.

[0082] The battery 1300 according to the first embodiment further comprises the following components in addition to the components of the battery 1200 according to the first embodiment described above.

[0083] That is, in battery 1300 according to the first embodiment, rounded portions are provided at corners of first active material layer 120 that are adjacent to first rounded portion 140. For example, in the example shown in Fig. 4, rounded portions are provided at corners of first active material layer 120 that are adjacent to first rounded portion 140a, first rounded portion 140b, first rounded portion 140c, and first rounded portion 140d.

[0084] The above configuration can further reduce the possibility of the active material falling off. That is, it is possible to reduce stress concentration at the corners of the first active material layer 120 (for example, to disperse impact force). This reduces the possibility of the first active material layer 120 separating from the first current collector 110 (or the first active material layer 120 collapsing from the first current collector 110) at the corners where the first rounded portions 140 are provided.

[0085] As the shape of the rounded portion of the first active material layer 120, the shape shown as the first rounded portion 140 can be used.

[0086] FIG. 5 is an xy diagram (top perspective view) showing another example of the shape of the first current collector 110 and the first active material layer 120. In FIG.

[0087] 5(a), first rounded portions 140 may be provided at two diagonally opposite corners of the first current collector 110. In this case, the first active material layer 120 may have the same shape as the first current collector 110.

[0088] 5(b), first rounded portions 140 may be provided at two adjacent corners of the first current collector 110. In this case, the first active material layer 120 may have the same shape as the first current collector 110.

[0089] 5(c) to 5(e), all of the corners of the first current collector 110 may be cut in a straight line to provide four first rounded portions 140. In this case, as shown in FIG. 5(c), the first active material layer 120 may not have any rounded portions. Alternatively, as shown in FIG. 5(d), the first active material layer 120 may have the same shape as the first current collector 110. Alternatively, as shown in FIG. 5(e), all of the corners of the first active material layer 120 may be cut in a curved line to provide four rounded portions.

[0090] FIG. 6 is a diagram showing a schematic configuration of the battery 1400 according to the first embodiment.

[0091] FIG. 6(a) is an xz diagram (sectional view taken along line 6A) showing a schematic configuration of the battery 1400 according to the first embodiment.

[0092] FIG. 6(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1400 according to the first embodiment.

[0093] The battery 1400 according to the first embodiment further comprises the following components in addition to the components of the battery 1000 according to the first embodiment described above.

[0094] That is, in the battery 1400 according to the first embodiment, the second electrode layer 200 further includes a second current collector 210 , a second active material layer 220 , and a second solid electrolyte layer 230 .

[0095] The second active material layer 220 is a layer that is in contact with the second current collector 210 and is disposed in an area narrower than the second current collector 210 .

[0096] The second solid electrolyte layer 230 is a layer that is in contact with the second current collector 210 and the second active material layer 220 and is disposed in the same area as the second current collector 210 .

[0097] The second active material layer 220 faces the first active material layer 120 with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 interposed therebetween.

[0098] The first solid electrolyte layer 130 and the second solid electrolyte layer 230 are bonded to each other.

[0099] A second rounded portion 240 is provided on the outer periphery of the second electrode layer 200.

[0100] According to the above configuration, the possibility of the active material falling off can be further reduced. That is, by using the second electrode layer 200 having an outer peripheral portion provided with the second rounded portion 240, it is possible to reduce the concentration of stress (for example, to disperse impact force) at the outer peripheral portion provided with the second rounded portion 240 of the laminate of the second current collector 210 and the second solid electrolyte layer 230. This reduces the possibility of the second solid electrolyte layer 230 separating from the second current collector 210 (or the solid electrolyte collapsing from the second current collector 210) at the outer periphery where the rounded portion 240 is provided. Therefore, the second active material layer 220 can be covered with the second solid electrolyte layer 230, which is less likely to peel off from the second current collector 210. This reduces damage to the second active material layer 220, even when a shock from a corner is applied during battery manufacture or use, for example. In other words, the second solid electrolyte layer 230 reduces the possibility of the active material falling off from the second active material layer 220. This prevents a short circuit within the battery, which may occur due to the active material falling off from the second active material layer 220 moving inside the battery. This further improves the reliability of the battery.

[0101] Furthermore, with the above configuration, the second active material layer 220 is covered with the second solid electrolyte layer 230, which is not easily peeled off from the second current collector 210, and therefore, even if the second active material layer 220 is disposed close to the outer periphery of the second current collector 210, the active material can be prevented from falling off from the second active material layer 220. Therefore, the second active material layer 220 can be disposed over as large an area as possible within an area narrower than the second current collector 210. This makes it possible to further increase the energy density of the battery.

[0102] As shown in FIG. 6, the shape of the second electrode layer 200 (that is, the shape of the second current collector 210 and the second solid electrolyte layer 230) may have corners.

[0103] In this case, a second rounded portion 240 may be provided at the corner portion of the second electrode layer 200.

[0104] The above configuration further reduces the possibility of the active material falling off. That is, stress concentration can be reduced (e.g., impact force can be dispersed) at the corners where the second rounded portions 240 are provided in the laminate of the second current collector 210 and the second solid electrolyte layer 230. This reduces the possibility of the second solid electrolyte layer 230 separating from the second current collector 210 (or the solid electrolyte collapsing from the second current collector 210) at the corners where the second rounded portions 240 are provided. Therefore, the second active material layer 220 can be covered with the second solid electrolyte layer 230, which is less likely to peel off from the second current collector 210. This reduces damage transmitted to the second active material layer 220, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the second solid electrolyte layer 230 reduces the possibility of the active material falling off from the second active material layer 220. This prevents a short circuit inside the battery that can occur due to the active material that has fallen off from the second active material layer 220 moving inside the battery, thereby further improving the reliability of the battery.

[0105] Furthermore, with the above configuration, the second active material layer 220 is covered with the second solid electrolyte layer 230, which is not easily peeled off from the second current collector 210, and therefore, even if the second active material layer 220 is disposed close to a corner of the second current collector 210, the active material can be prevented from falling off from the second active material layer 220. Therefore, the second active material layer 220 can be disposed over as large an area as possible within an area narrower than the second current collector 210. This makes it possible to further increase the energy density of the battery.

[0106] The shape of the second rounded portion 240 may be the same as that shown for the first rounded portion 140.

[0107] FIG. 7 is a diagram showing a schematic configuration of a battery 1500 according to the first embodiment.

[0108] FIG. 7(a) is an xz diagram (7A cross-sectional view) showing a schematic configuration of the battery 1500 in the first embodiment.

[0109] FIG. 7(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1500 according to the first embodiment.

[0110] The battery 1500 according to the first embodiment further includes the following components in addition to the components of the battery 1200 according to the first embodiment described above.

[0111] That is, in the battery 1500 according to the first embodiment, the shape of the second electrode layer 200 is a polygonal shape having a plurality of corners (for example, a triangular shape, a quadrangular shape, a rectangular shape, etc.).

[0112] At this time, second rounded portions 240 are provided at all of the multiple corner portions of second electrode layer 200. For example, in the example shown in Fig. 7, second rounded portion 240a, second rounded portion 240b, second rounded portion 240c, and second rounded portion 240d are provided at all of the four corner portions of rectangular second electrode layer 200.

[0113] The above configuration further reduces the possibility of the active material falling off. That is, stress concentration can be reduced (e.g., impact force can be dispersed) at all corners of the laminate of the second current collector 210 and the second solid electrolyte layer 230. This reduces the possibility of the second solid electrolyte layer 230 separating from the second current collector 210 (or the solid electrolyte collapsing from the second current collector 210) at all corners where the second rounded portion 240 is provided. Therefore, the second active material layer 220 can be covered with the second solid electrolyte layer 230, which is less likely to peel off from the second current collector 210. This reduces damage transmitted to the second active material layer 220, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the second solid electrolyte layer 230 reduces the possibility of the active material falling off from the second active material layer 220. This prevents a short circuit inside the battery that can occur due to the active material that has fallen off from the second active material layer 220 moving inside the battery, thereby further improving the reliability of the battery.

[0114] Furthermore, with the above configuration, the second active material layer 220 is covered with the second solid electrolyte layer 230, which is not easily peeled off from the second current collector 210, and therefore, even if the second active material layer 220 is disposed close to all corners of the second current collector 210, it is possible to prevent the active material from falling off from the second active material layer 220. Therefore, the second active material layer 220 can be disposed over as large an area as possible within an area narrower than the second current collector 210. This makes it possible to further increase the energy density of the battery.

[0115] Furthermore, according to the above configuration, by using the polygonal second electrode layer 200, when arranging a plurality of batteries according to the first embodiment, the batteries can be arranged more densely. That is, compared to a configuration using a circular second electrode layer 200 (for example, a coin-type battery), a configuration using a polygonal second electrode layer 200 (for example, a prismatic battery) can reduce gaps when arranging a plurality of batteries in a planar direction. This can further increase the energy density of a battery module (or a battery pack) formed by arranging a plurality of batteries.

[0116] FIG. 8 is a diagram showing a schematic configuration of the battery 1600 according to the first embodiment.

[0117] FIG. 8(a) is an xz view (sectional view taken along line 8A) showing a schematic configuration of the battery 1600 according to the first embodiment.

[0118] FIG. 8(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1600 according to the first embodiment.

[0119] The battery 1600 according to the first embodiment further includes the following components in addition to the components of the battery 1500 according to the first embodiment described above.

[0120] That is, in battery 1600 according to the first embodiment, rounded portions are provided at corners of second active material layer 220 that are adjacent to second rounded portion 240. For example, in the example shown in Fig. 8, rounded portions are provided at corners of second active material layer 220 that are adjacent to second rounded portion 240a, second rounded portion 240b, second rounded portion 240c, and second rounded portion 240d.

[0121] The above configuration can further reduce the possibility of the active material falling off. That is, it is possible to reduce stress concentration at the corners of the second active material layer 220 (for example, to disperse impact force). This reduces the possibility of the second active material layer 220 separating from the second current collector 210 (or the second active material layer 220 collapsing from the second current collector 210) at the corners where the second rounded portions 240 are provided.

[0122] In battery 1600 according to the first embodiment, rounded portions may be provided at corners of first active material layer 120 that are adjacent to first rounded portion 140. For example, in the example shown in Fig. 8, rounded portions are provided at corners of first active material layer 120 that are adjacent to first rounded portion 140a, first rounded portion 140b, first rounded portion 140c, and first rounded portion 140d.

[0123] The shape of the rounded portion of the second active material layer 220 may be the shape shown as the first rounded portion 140.

[0124] As another example of the shape of the second current collector 210 and the second active material layer 220, the shape shown in FIG. 5 may be used as another example of the shape of the first current collector 110 and the first active material layer 120.

[0125] FIG. 9 is a diagram showing a schematic configuration of a battery 1700 according to the first embodiment.

[0126] FIG. 9(a) is an xz diagram (sectional view taken along line 9A) showing a schematic configuration of a battery 1700 according to the first embodiment.

[0127] FIG. 9(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1700 according to the first embodiment.

[0128] The battery 1700 according to the first embodiment further includes the following components in addition to the components of the battery 1600 according to the first embodiment described above.

[0129] That is, in battery 1700 according to the first embodiment, first electrode layer 100 has a circular shape (e.g., an ellipse, a perfect circle, a coin shape, etc.). In this case, first rounded portion 140 refers to the end portion (outer periphery) of circular first electrode layer 100.

[0130] The above configuration can further reduce the possibility of the active material falling off. That is, by using a circular first electrode layer 100, it is possible to reduce stress concentration (for example, to disperse impact force) at all outer periphery portions of the laminate of the first current collector 110 and the first solid electrolyte layer 130. This reduces the possibility of the first solid electrolyte layer 130 separating from the first current collector 110 (or the solid electrolyte collapsing from the first current collector 110) at all outer periphery portions. Therefore, the first active material layer 120 can be covered with the first solid electrolyte layer 130, which is difficult to peel off from the first current collector 110. As a result, even if a corner impact is applied during the manufacture or use of the battery, for example, the first solid electrolyte layer 130 can reduce damage transmitted to the first active material layer 120. In other words, the first solid electrolyte layer 130 This reduces the possibility that the active material will fall off from the first active material layer 120. This prevents a short circuit inside the battery that may occur due to the active material falling off from the first active material layer 120 moving inside the battery, thereby further improving the reliability of the battery.

[0131] Furthermore, with the above configuration, the first active material layer 120 is covered with the first solid electrolyte layer 130, which is difficult to peel off from the first current collector 110, and therefore, even if the first active material layer 120 is disposed close to the entire outer periphery of the first current collector 110, it is possible to prevent the active material from falling off from the first active material layer 120. Therefore, the first active material layer 120 can be disposed over as large an area as possible within an area narrower than the first current collector 110. This makes it possible to further increase the energy density of the battery.

[0132] In battery 1700 according to the first embodiment, second electrode layer 200 may have a circular shape (e.g., an ellipse, a circle, a coin, etc.). In this case, second rounded portion 240 refers to the end (outer periphery) of circular second electrode layer 200.

[0133] The above configuration further reduces the possibility of the active material falling off. That is, by using a circular second electrode layer 200, stress concentration can be reduced (e.g., impact force can be dispersed) at all outer peripheries of the laminate of the second current collector 210 and the second solid electrolyte layer 230. This reduces the possibility of the second solid electrolyte layer 230 separating from the second current collector 210 (or the solid electrolyte collapsing from the second current collector 210) at all outer peripheries. Therefore, the second active material layer 220 can be covered with the second solid electrolyte layer 230, which is less likely to peel off from the second current collector 210. This reduces damage transmitted to the second active material layer 220, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the second solid electrolyte layer 230 reduces the possibility of the active material falling off from the second active material layer 220. This prevents a short circuit inside the battery that can occur due to the active material that has fallen off from the second active material layer 220 moving inside the battery, thereby further improving the reliability of the battery.

[0134] Furthermore, with the above configuration, the second active material layer 220 is covered with the second solid electrolyte layer 230, which is difficult to peel off from the second current collector 210, and therefore, even if the second active material layer 220 is disposed close to the entire outer periphery of the second current collector 210, it is possible to prevent the active material from falling off from the second active material layer 220. Therefore, the second active material layer 220 can be disposed over as large an area as possible within an area narrower than the second current collector 210. This makes it possible to further increase the energy density of the battery.

[0135] As shown in FIG. 9, in the battery 1700 of embodiment 1, at least one (or both) of the shape of the first active material layer 120 and the shape of the second active material layer 220 may be circular (e.g., elliptical, circular, coin-shaped, etc.).

[0136] The above configuration can further reduce the possibility of active material falling off. That is, it is possible to reduce stress concentration (e.g., to disperse impact force) in all outer peripheral portions of the first active material layer 120 and the second active material layer 220. This reduces the possibility of the first active material layer 120 separating from the first current collector 110 (or the first active material layer 120 collapsing from the first current collector 110) and the second active material layer 220 separating from the second current collector 210 (or the second active material layer 220 collapsing from the second current collector 210) in all outer peripheral portions.

[0137] In the first embodiment, the first active material layer 120 may be disposed over a larger area than the second active material layer 220.

[0138] At this time, the second active material layer 220 may be disposed within the area where the first active material layer 120 is formed. good.

[0139] According to the above configuration, deposition of metal (e.g., lithium) in the first electrode layer 100 can be suppressed. Therefore, short-circuiting between the first electrode layer 100 and the second electrode layer 200 due to metal deposition can be prevented. For example, in the case of a lithium-ion battery using a carbon material or metallic lithium for the negative electrode, the potential on the negative electrode side drops to a level close to the potential at which lithium ions deposit as metal during charging. Therefore, for example, when charging in a low-temperature environment or rapid charging is performed, the negative electrode active material may not be able to absorb lithium ions quickly enough. In this case, lithium ions may deposit as metallic lithium. This metallic lithium deposition is particularly likely to occur at the end portions where current is concentrated. For this reason, when the main surfaces of the battery are seen through, the main surface of the first active material layer 120 is configured to be housed within the main surface of the second active material layer 220. This configuration can suppress metallic lithium deposition when the first active material layer 120 is a negative electrode active material layer.

[0140] (Embodiment 2) The following describes the second embodiment. Explanations that overlap with the first embodiment will be omitted where appropriate.

[0141] FIG. 10 is a diagram showing a schematic configuration of a battery 2000 according to the second embodiment.

[0142] FIG. 10(a) is an xz diagram (cross-sectional view taken along line 10A) showing a schematic configuration of a battery 2000 in the second embodiment.

[0143] FIG. 10(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2000 in the second embodiment.

[0144] The battery 2000 in the second embodiment further comprises the following components in addition to the components of the battery 1400 in the first embodiment described above.

[0145] That is, in battery 2000 according to the second embodiment, first rounded portion 140 and second rounded portion 240 have the same shape.

[0146] At this time, the first electrode layer 100 and the second electrode layer 200 are stacked on top of each other in a state in which the end of the first rounded portion 140 and the end of the second rounded portion 240 are aligned.

[0147] The above configuration can further strengthen the bond between the first solid electrolyte layer 130 and the second solid electrolyte layer 230. That is, by stacking the first electrode layer 100 and the second electrode layer 200 on top of each other with the end of the first rounded portion 140 and the end of the second rounded portion 240 aligned, it is possible to eliminate steps at the positions of the end of the first rounded portion 140 and the end of the second rounded portion 240. This reduces the possibility that the second solid electrolyte layer 230 will separate from the first solid electrolyte layer 130 at the positions of the end of the first rounded portion 140 and the end of the second rounded portion 240. This can further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the second solid electrolyte layer 230 from the first solid electrolyte layer 130.

[0148] In the present disclosure, the term "shape of the rounded portion" encompasses the meaning of "shape in the direction of the principal surface (xy plane direction) of a predetermined layer on which the rounded portion is provided."

[0149] In addition, in the present disclosure, "the shapes of the two rounded portions are the same" includes "the shapes in the principal surface direction (xy plane direction) of the two specified layers on which the two rounded portions are provided are the same."

[0150] In the present disclosure, as shown in FIG. 10, "a state in which the end of the first rounded portion 140 and the end of the second rounded portion 240 coincide" includes, for example, "a state in which the curved cut portion that forms the first rounded portion 140 and the curved cut portion that forms the second rounded portion 240 are overlapped with each other so that no step is created."

[0151] Furthermore, in the present disclosure, "a state in which the end of the first rounded portion 140 and the end of the second rounded portion 240 coincide" also includes, for example, the meaning of "a state in which the straight cut portion and the corner portion of 90 degrees or more that form the first rounded portion 140 and the straight cut portion and the corner portion of 90 degrees or more that form the second rounded portion 240 are overlapped with each other so as not to create a step."

[0152] Furthermore, in the present disclosure, "a state in which two predetermined ends coincide with each other" encompasses, for example, "a state in which two predetermined ends coincide with each other except for unavoidable misalignment due to manufacturing errors." In this case, "a state in which two predetermined ends are superimposed on each other without creating a step" encompasses "a state in which two predetermined ends are superimposed on each other without creating a step except for a step created by unavoidable misalignment due to manufacturing errors."

[0153] FIG. 11 is a diagram showing a schematic configuration of a battery 2100 according to the second embodiment.

[0154] FIG. 11(a) is an xz diagram (cross-sectional view 11A) showing a schematic configuration of a battery 2100 in the second embodiment.

[0155] FIG. 11(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2100 in the second embodiment.

[0156] The battery 2100 in the second embodiment further includes the following components in addition to the components of the battery 2000 in the second embodiment described above.

[0157] That is, in the battery 2100 according to the second embodiment, the first electrode layer 100 and the second electrode layer 200 have the same shape.

[0158] At this time, the first electrode layer 100 and the second electrode layer 200 are stacked on top of each other in a state where an end of the first electrode layer 100 and an end of the second electrode layer 200 are aligned with each other.

[0159] The above configuration can further strengthen the bond between the first solid electrolyte layer 130 and the second solid electrolyte layer 230. That is, by stacking the first electrode layer 100 and the second electrode layer 200 such that the end of the first electrode layer 100 and the end of the second electrode layer 200 coincide with each other, it is possible to eliminate steps at the positions of the end of the first electrode layer 100 and the end of the second electrode layer 200. This reduces the possibility that the second solid electrolyte layer 230 will separate from the first solid electrolyte layer 130 at the positions of the end of the first electrode layer 100 and the end of the second electrode layer 200. This can further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the second solid electrolyte layer 230 from the first solid electrolyte layer 130.

[0160] In the present disclosure, as shown in FIG. 11, "a state in which the end of the first electrode layer 100 and the end of the second electrode layer 200 coincide" encompasses, for example, the meaning of "a state in which the straight end, corners, and rounded portions of the first electrode layer 100 and the straight end, corners, and rounded portions of the second electrode layer 200 are superimposed on each other without creating any steps."

[0161] FIG. 12 is a diagram showing a schematic configuration of a battery 2200 according to the second embodiment.

[0162] FIG. 12(a) is an xz diagram (cross-sectional view taken along line 12A) showing a schematic configuration of a battery 2200 in the second embodiment.

[0163] FIG. 12(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2200 in the second embodiment.

[0164] In addition to the configuration of the battery 2100 in the second embodiment described above, the battery 2200 in the second embodiment further includes the following configuration.

[0165] That is, in the battery 2200 according to the second embodiment, first rounded portions 140 (140a, 140b, 140c, 140d) are provided at all of the corners of the first electrode layer 100.

[0166] Furthermore, second rounded portions 240 (240a, 240b, 240c, 240d) are provided at all of the multiple corner portions of the second electrode layer 200.

[0167] In the present disclosure, as shown in FIG. 12, "a state in which the end of the first electrode layer 100 and the end of the second electrode layer 200 coincide" encompasses, for example, "a state in which the linear end and all of the rounded portions of the first electrode layer 100 and the linear end and all of the rounded portions of the second electrode layer 200 are superimposed on each other without creating any steps."

[0168] FIG. 13 is a diagram showing a schematic configuration of a battery 2300 according to the second embodiment.

[0169] FIG. 13(a) is an xz diagram (cross-sectional view taken along line 13A) showing a schematic configuration of a battery 2300 in the second embodiment.

[0170] FIG. 13(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 2300 in the second embodiment.

[0171] The battery 2300 in the second embodiment further comprises the following components in addition to the components of the battery 2000 in the second embodiment described above.

[0172] That is, in the battery 2300 according to the second embodiment, the shape of the first electrode layer 100 is circular (for example, elliptical, circular, or coin-shaped).

[0173] Furthermore, the shape of the second electrode layer 200 is circular (for example, elliptical, circular, coin-shaped, etc.).

[0174] In the present disclosure, as shown in FIG. 13, "a state in which the end of the first electrode layer 100 and the end of the second electrode layer 200 coincide" encompasses, for example, "a state in which the curved end (outer peripheral portion) forming the first rounded portion 140 of the first electrode layer 100 and the curved end (outer peripheral portion) forming the second rounded portion 240 of the second electrode layer 200 are overlapped with each other so as not to create a step."

[0175] As shown in FIG. 13, in the battery 2300 of embodiment 2, at least one (or both) of the shape of the first active material layer 120 and the shape of the second active material layer 220 may be circular (e.g., elliptical, circular, coin-shaped, etc.).

[0176] According to the above configuration, the possibility of the active material falling off can be further reduced. This reduces stress concentration (e.g., disperses impact forces) at all outer peripheries of the first active material layer 120 and the second active material layer 220. This reduces the possibility of the first active material layer 120 separating from the first current collector 110 (or the first active material layer 120 collapsing from the first current collector 110) and the second active material layer 220 separating from the second current collector 210 (or the second active material layer 220 collapsing from the second current collector 210) at all outer peripheries.

[0177] (Embodiment 3) The following describes the third embodiment. Explanations that overlap with the first or second embodiment will be omitted as appropriate.

[0178] FIG. 14 is a diagram showing a schematic configuration of a battery 3000 according to the third embodiment.

[0179] FIG. 14(a) is an xz view (cross-sectional view taken along line 14A) showing a schematic configuration of a battery 3000 according to the third embodiment.

[0180] FIG. 14(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3000 according to the third embodiment.

[0181] The battery 3000 in the third embodiment further comprises the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0182] That is, in the battery 3000 in the third embodiment, the second electrode layer 200 includes a second current collector 210 and a second active material layer 220.

[0183] The second active material layer 220 is a layer that is in contact with the second current collector 210 and is disposed in an area narrower than the second current collector 210 .

[0184] The first solid electrolyte layer 130 is a layer that is in contact with the second current collector 210 and the second active material layer 220 and is disposed in the same area as the second current collector 210 .

[0185] The second active material layer 220 faces the first active material layer 120 with the first solid electrolyte layer 130 interposed therebetween.

[0186] A second rounded portion 240 is provided on the outer periphery of the second current collector 210.

[0187] The first rounded portion 140 and the second rounded portion 240 have the same shape.

[0188] The first electrode layer 100 and the second electrode layer 200 are stacked on top of each other in a state where the end of the first rounded portion 140 and the end of the second rounded portion 240 are aligned.

[0189] The above configuration can further strengthen the bond between the first solid electrolyte layer 130 and the second current collector 210. That is, by stacking the first electrode layer 100 and the second electrode layer 200 on top of each other with the end of the first rounded portion 140 and the end of the second rounded portion 240 aligned, it is possible to eliminate steps at the positions of the end of the first rounded portion 140 and the end of the second rounded portion 240. This reduces the possibility that the second current collector 210 will separate from the first solid electrolyte layer 130 at the positions of the end of the first rounded portion 140 and the end of the second rounded portion 240. This can further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the second current collector 210 from the first solid electrolyte layer 130.

[0190] FIG. 15 is a diagram showing a schematic configuration of a battery 3100 according to the third embodiment.

[0191] FIG. 15(a) is an xz diagram (cross-sectional view taken along line 15A) showing a schematic configuration of a battery 3100 according to the third embodiment.

[0192] FIG. 15(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3100 according to the third embodiment.

[0193] The battery 3100 in the third embodiment further includes the following components in addition to the components of the battery 3000 in the third embodiment described above.

[0194] That is, in the battery 3100 according to the third embodiment, the first electrode layer 100 and the second electrode layer 200 have the same shape.

[0195] The first electrode layer 100 and the second electrode layer 200 are stacked on top of each other in a state where an end of the first electrode layer 100 and an end of the second electrode layer 200 are aligned.

[0196] The above configuration can further strengthen the bond between the first solid electrolyte layer 130 and the second current collector 210. That is, by stacking the first electrode layer 100 and the second electrode layer 200 such that the end of the first electrode layer 100 and the end of the second electrode layer 200 coincide with each other, it is possible to eliminate any step at the positions of the end of the first electrode layer 100 and the end of the second electrode layer 200. This reduces the possibility that the second current collector 210 will separate from the first solid electrolyte layer 130 at the positions of the end of the first electrode layer 100 and the end of the second electrode layer 200. This can further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the second current collector 210 from the first solid electrolyte layer 130.

[0197] FIG. 16 is a diagram showing a schematic configuration of a battery 3200 according to the third embodiment.

[0198] FIG. 16(a) is an xz diagram (cross-sectional view taken along line 16A) showing a schematic configuration of a battery 3200 according to the third embodiment.

[0199] FIG. 16(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3200 according to the third embodiment.

[0200] The battery 3200 according to the third embodiment further includes the following components in addition to the components of the battery 3100 according to the third embodiment described above.

[0201] That is, in the battery 3200 according to the third embodiment, the first electrode layer 100 and the second electrode layer 200 are circular.

[0202] According to the above configuration, the bond between the first solid electrolyte layer 130 and the second current collector 210 can be strengthened. That is, by stacking the first electrode layer 100 and the second electrode layer 200 on top of each other in a state where the end of the circular first electrode layer 100 and the end of the circular second electrode layer 200 coincide with each other, it is possible to eliminate steps at all positions of the outer peripheries of the first electrode layer 100 and the second electrode layer 200. This reduces the possibility that the second current collector 210 will separate from the first solid electrolyte layer 130 at all positions of the outer peripheries of the first electrode layer 100 and the second electrode layer 200. Therefore, it is possible to further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the second current collector 210 from the first solid electrolyte layer 130.

[0203] As shown in FIG. 16, in the battery 3200 according to the third embodiment, at least one of the shape of the first active material layer 120 and the shape of the second active material layer 220 (or Both may be circular (e.g., elliptical, circular, coin-shaped, etc.).

[0204] The above configuration can further reduce the possibility of active material falling off. That is, it is possible to reduce stress concentration (e.g., to disperse impact force) in all outer peripheral portions of the first active material layer 120 and the second active material layer 220. This reduces the possibility of the first active material layer 120 separating from the first current collector 110 (or the first active material layer 120 collapsing from the first current collector 110) and the second active material layer 220 separating from the second current collector 210 (or the second active material layer 220 collapsing from the second current collector 210) in all outer peripheral portions.

[0205] (Fourth embodiment) The fourth embodiment will be described below. Descriptions that overlap with any of the first to third embodiments will be omitted as appropriate.

[0206] FIG. 17 is a diagram showing a schematic configuration of a battery 4000 according to the fourth embodiment.

[0207] FIG. 17(a) is an xz diagram (cross-sectional view taken along line 17A) showing a schematic configuration of a battery 4000 according to the fourth embodiment.

[0208] FIG. 17(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 4000 according to the fourth embodiment.

[0209] The battery 4000 in the fourth embodiment further comprises the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0210] That is, the battery 4000 in the fourth embodiment further includes a third electrode layer 300.

[0211] The third electrode layer 300 is stacked on the first electrode layer 100. The third electrode layer 300 is a layer that serves as a counter electrode to the first electrode layer 100.

[0212] The third electrode layer 300 includes a third current collector 310 , a third active material layer 320 , and a third solid electrolyte layer 330 .

[0213] The first current collector 110 and the third current collector 310 are electrically connected to each other.

[0214] The third active material layer 320 is disposed in contact with the third current collector 310 and has an area smaller than that of the third current collector 310 .

[0215] The third solid electrolyte layer 330 is in contact with the third current collector 310 and the third active material layer 320 , and is disposed in the same area as the third current collector 310 .

[0216] A third rounded portion 340 is provided on the outer periphery of the third electrode layer 300.

[0217] The first rounded portion 140 and the third rounded portion 340 have the same shape.

[0218] The first electrode layer 100 and the third electrode layer 300 are stacked on top of each other in a state where the end of the first rounded portion 140 and the end of the third rounded portion 340 are aligned.

[0219] According to the above-described configuration, the possibility of the active material falling off can be further reduced. That is, by using the third electrode layer 300 having the outer peripheral portion provided with the third rounded portion 340, the outer peripheral portion provided with the third rounded portion 340 of the laminate of the third current collector 310 and the third solid electrolyte layer 330 can be reduced. This reduces stress concentration (e.g., disperses impact force). This reduces the possibility of the third solid electrolyte layer 330 separating from the third current collector 310 (or the solid electrolyte collapsing from the third current collector 310) at the outer periphery where the third rounded portion 340 is provided. Therefore, the third active material layer 320 can be covered with the third solid electrolyte layer 330, which is less likely to peel off from the third current collector 310. This reduces damage to the third active material layer 320, for example, even when an impact from a corner is applied during battery manufacture or use. In other words, the third solid electrolyte layer 330 reduces the possibility of the active material falling off from the third active material layer 320. This prevents short circuits within the battery that can occur due to the active material falling off from the third active material layer 320 moving inside the battery. This further improves the reliability of the battery.

[0220] Furthermore, with the above configuration, the third active material layer 320 is covered with the third solid electrolyte layer 330, which is difficult to peel off from the third current collector 310, and therefore, even if the third active material layer 320 is disposed close to the outer periphery of the third current collector 310, the active material can be prevented from falling off from the third active material layer 320. Therefore, the third active material layer 320 can be disposed over as large an area as possible within an area narrower than the third current collector 310. This can further increase the energy density of the battery.

[0221] Furthermore, the above configuration can further strengthen the bond between the first electrode layer 100 and the third electrode layer 300. That is, by stacking the first electrode layer 100 and the third electrode layer 300 such that the ends of the first rounded portion 140 and the third rounded portion 340 are aligned, it is possible to eliminate steps at the positions of the ends of the first rounded portion 140 and the third rounded portion 340. This reduces the possibility that the third electrode layer 300 (e.g., the third current collector 310) will separate from the first electrode layer 100 (e.g., the first current collector 110) at the positions of the ends of the first rounded portion 140 and the third rounded portion 340. This further reduces the risk of battery components (e.g., active material) falling off due to separation of the third electrode layer 300 from the first electrode layer 100. Furthermore, current concentration and an increase in resistance caused by partial separation of the third electrode layer 300 from the first electrode layer 100 can be suppressed.

[0222] The third active material layer 320 is a layer containing a counter electrode material (for example, an active material).

[0223] The third solid electrolyte layer 330 is a solid electrolyte layer that includes a solid electrolyte.

[0224] The first active material layer 120 may be a negative electrode active material layer. In this case, the electrode material is a negative electrode active material. The first current collector 110 is a negative electrode current collector. The first solid electrolyte layer 130 is a negative electrode-side solid electrolyte layer. The third active material layer 320 is a positive electrode active material layer. The counter electrode material is a positive electrode active material. The third current collector 310 is a positive electrode current collector. The third solid electrolyte layer 330 is a positive electrode-side solid electrolyte layer.

[0225] Alternatively, the first active material layer 120 may be a positive electrode active material layer. In this case, the electrode material is a positive electrode active material. The first current collector 110 is a positive electrode current collector. The first solid electrolyte layer 130 is a positive electrode-side solid electrolyte layer. The third active material layer 320 is a negative electrode active material layer. The counter electrode material is a negative electrode active material. The third current collector 310 is a negative electrode current collector. The third solid electrolyte layer 330 is a negative electrode-side solid electrolyte layer.

[0226] As shown in FIG. 17, the third active material layer 320 and the third solid electrolyte layer 330 may be disposed on the main surface of the third current collector 310 on the side where the first current collector 110 is not disposed.

[0227] 17, the third current collector 310 may be disposed on one of the main surfaces of the first current collector 110 on the side where the first active material layer 120 is not disposed.

[0228] 17, the main surface of the first current collector 110 and the main surface of the third current collector 310 may be in direct contact with each other. Alternatively, another conductive member (for example, an adhesive layer containing an adhesive material) may be provided between the main surface of the first current collector 110 and the main surface of the third current collector 310.

[0229] As shown in FIG. 17, the first electrode layer 100 and the third electrode layer 300 may have the same shape.

[0230] In this case, the first electrode layer 100 and the third electrode layer 300 may be stacked on top of each other in a state where the end of the first electrode layer 100 and the end of the third electrode layer 300 are aligned.

[0231] The above configuration can further strengthen the bond between the first electrode layer 100 and the third electrode layer 300. That is, by stacking the first electrode layer 100 and the third electrode layer 300 such that the end of the first electrode layer 100 and the end of the third electrode layer 300 coincide with each other, it is possible to eliminate steps at the positions of the end of the first electrode layer 100 and the end of the third electrode layer 300. This reduces the possibility that the third electrode layer 300 (e.g., the third current collector 310) will separate from the first electrode layer 100 (e.g., the first current collector 110) at the positions of the end of the first electrode layer 100 and the end of the third electrode layer 300. This can further suppress detachment of battery components (e.g., detachment of active material) caused by detachment of the third electrode layer 300 from the first electrode layer 100. Furthermore, current concentration and an increase in resistance caused by partial separation of the third electrode layer 300 from the first electrode layer 100 can be further suppressed.

[0232] The shape of the third rounded portion 340 may be the same as that shown for the first rounded portion 140.

[0233] Furthermore, the shape of the third electrode layer 300 can be the same as that shown for the first electrode layer 100.

[0234] As another example of the shape of the third current collector 310 and the third active material layer 320, the shape shown in FIG. 5 may be used as another example of the shape of the first current collector 110 and the first active material layer 120.

[0235] FIG. 18 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 4100 according to the fourth embodiment.

[0236] The battery 4100 according to the fourth embodiment further includes the following components in addition to the components of the battery 4000 according to the fourth embodiment described above.

[0237] That is, the battery 4100 in the fourth embodiment further includes a second electrode layer 200 and a fourth electrode layer 400.

[0238] The fourth electrode layer 400 is a layer that has the same polarity as the first electrode layer 100. The fourth electrode layer 400 includes a fourth current collector 410 and a fourth active material layer 420. The fourth active material layer 420 is a layer that includes an electrode material (for example, an active material).

[0239] According to the above configuration, a stacked battery can be realized in which the possibility of the active material falling off is reduced. More specifically, a stacked battery can be realized in which a first power generating element (a power generating element composed of a first electrode layer 100 and a second electrode layer 200) and a second power generating element (a power generating element composed of a third electrode layer 300 and a fourth electrode layer 400) are connected in series. This reduces the possibility of the active material falling off. This allows for a high battery voltage to be achieved by connecting multiple power generating elements in series while reducing the power consumption.

[0240] FIG. 19 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 4200 according to the fourth embodiment.

[0241] In addition to the configuration of battery 4100 in the fourth embodiment described above, battery 4200 in the fourth embodiment further includes the following configuration.

[0242] That is, in battery 4200 according to the fourth embodiment, second electrode layer 200 includes second solid electrolyte layer 230. At this time, first solid electrolyte layer 130 and second solid electrolyte layer 230 are joined to each other.

[0243] Furthermore, the fourth electrode layer 400 includes a fourth solid electrolyte layer 430. The fourth solid electrolyte layer 430 is a solid electrolyte layer that includes a solid electrolyte.

[0244] At this time, the third solid electrolyte layer 330 and the fourth solid electrolyte layer 430 are bonded to each other.

[0245] The above configuration reduces the possibility of short circuits caused by pinholes that may occur in each solid electrolyte layer, thereby reducing the possibility of active material falling off and short circuits and achieving a high battery voltage by connecting multiple power generating elements in series.

[0246] The first electrode layer 100, the second electrode layer 200, the third electrode layer 300, and the fourth electrode layer 400 may have the same shape.

[0247] According to the above configuration, it is possible to further reduce the possibility of the active material falling off from each electrode layer and the possibility of separation between each electrode layer.

[0248] (Embodiment 5) The fifth embodiment will be described below. Descriptions that overlap with any of the first to fourth embodiments will be omitted as appropriate.

[0249] FIG. 20 is a diagram showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0250] FIG. 20(a) is an xz view (cross-sectional view taken along line 20A) showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0251] FIG. 20(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0252] The battery 5000 in the fifth embodiment further includes the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0253] That is, the battery 5000 in the fifth embodiment further includes a third electrode layer 300.

[0254] The third electrode layer 300 is stacked on the first electrode layer 100. The third electrode layer 300 is a layer that serves as a counter electrode to the first electrode layer 100.

[0255] The third electrode layer 300 includes a third active material layer 320 and a third solid electrolyte layer 330 .

[0256] The third active material layer 320 is disposed in contact with the first current collector 110 and has an area smaller than that of the first current collector 110 .

[0257] The third solid electrolyte layer 330 is in contact with the first current collector 110 and the third active material layer 320 and is disposed in the same area as the first current collector 110 .

[0258] A third rounded portion 340 is provided on the outer periphery of the third electrode layer 300.

[0259] The first rounded portion 140 and the third rounded portion 340 have the same shape.

[0260] The first electrode layer 100 and the third electrode layer 300 are stacked on top of each other in a state where the end of the first rounded portion 140 and the end of the third rounded portion 340 are aligned.

[0261] The above configuration further reduces the possibility of the active material falling off. Specifically, by using the third electrode layer 300 having an outer periphery where the third rounded portion 340 is provided, stress concentration can be reduced (e.g., impact force can be dispersed) at the outer periphery where the third rounded portion 340 is provided in the laminate of the first current collector 110 and the third solid electrolyte layer 330. This reduces the possibility of the third solid electrolyte layer 330 separating from the first current collector 110 (or the solid electrolyte collapsing from the first current collector 110) at the outer periphery where the third rounded portion 340 is provided. Therefore, the third active material layer 320 can be covered with the third solid electrolyte layer 330, which is less likely to peel off from the first current collector 110. This reduces damage to the third active material layer 320, for example, even when a corner impact is applied during battery manufacturing or use. In other words, the third solid electrolyte layer 330 can reduce the possibility that the active material will fall off from the third active material layer 320. This prevents a short circuit inside the battery that can occur due to the active material falling off from the third active material layer 320 moving inside the battery, thereby further improving the reliability of the battery.

[0262] Furthermore, with the above configuration, the third active material layer 320 is covered with the third solid electrolyte layer 330, which is difficult to peel off from the first current collector 110, and therefore, even if the third active material layer 320 is disposed close to the outer periphery of the first current collector 110, it is possible to prevent the active material from falling off from the third active material layer 320. Therefore, the third active material layer 320 can be disposed over as large an area as possible within an area narrower than the first current collector 110. This makes it possible to further increase the energy density of the battery.

[0263] 20 , the third active material layer 320 and the third solid electrolyte layer 330 may be disposed on one of the main surfaces of the first current collector 110 on which the first active material layer 120 is not disposed. This makes the first current collector 110 a bipolar current collector. The first current collector 110, the first active material layer 120, and the third active material layer 320 form a bipolar electrode.

[0264] FIG. 21 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 5100 according to the fifth embodiment.

[0265] Battery 5100 in the fifth embodiment further includes the following components in addition to the components of battery 5000 in the fifth embodiment described above.

[0266] That is, the battery 5100 in the fifth embodiment further includes a second electrode layer 200 and a fourth electrode layer 400.

[0267] The fourth electrode layer 400 is a layer that has the same polarity as the first electrode layer 100. The fourth electrode layer 400 includes a fourth current collector 410 and a fourth active material layer 420. The fourth active material layer 420 is made of an electrode material It is a layer containing a material (for example, an active material).

[0268] The above configuration makes it possible to realize a stacked battery with a reduced possibility of active material falling off. More specifically, it makes it possible to realize a stacked battery in which a first power generating element (a power generating element composed of a first electrode layer 100 and a second electrode layer 200) and a second power generating element (a power generating element composed of a third electrode layer 300 and a fourth electrode layer 400) are connected in series. This reduces the possibility of active material falling off, while achieving a high battery voltage due to the series connection of multiple power generating elements.

[0269] Furthermore, according to the above configuration, the first power generating element and the second power generating element can be joined more firmly by using a bipolar electrode composed of the first current collector 110, the first active material layer 120, and the third active material layer 320, compared to the case where a laminate of the first current collector 110 and the third current collector 310 is used, which is the configuration of the battery 4100 in the above-mentioned fourth embodiment.

[0270] FIG. 22 is an xz diagram (cross-sectional view) showing a schematic configuration of a battery 5200 according to the fifth embodiment.

[0271] Battery 5200 according to the fifth embodiment further includes the following components in addition to the components of battery 5100 according to the fifth embodiment described above.

[0272] That is, in battery 5200 according to the fifth embodiment, second electrode layer 200 includes second solid electrolyte layer 230. In this case, first solid electrolyte layer 130 and second solid electrolyte layer 230 are joined to each other.

[0273] Furthermore, the fourth electrode layer 400 includes a fourth solid electrolyte layer 430. The fourth solid electrolyte layer 430 is a solid electrolyte layer that includes a solid electrolyte.

[0274] At this time, the third solid electrolyte layer 330 and the fourth solid electrolyte layer 430 are bonded to each other.

[0275] The above configuration reduces the possibility of short circuits caused by pinholes that may occur in each solid electrolyte layer, thereby reducing the possibility of active material falling off and short circuits and achieving a high battery voltage by connecting multiple power generating elements in series.

[0276] The first electrode layer 100, the second electrode layer 200, the third electrode layer 300, and the fourth electrode layer 400 may have the same shape.

[0277] According to the above configuration, it is possible to further reduce the possibility of the active material falling off from each electrode layer and the possibility of separation between each electrode layer.

[0278] The batteries according to the first to fifth embodiments may be, for example, all-solid-state batteries (for example, all-solid-state lithium secondary batteries). The batteries according to the first to fifth embodiments can realize all-solid-state batteries that can prevent short-circuiting between the positive and negative electrodes during manufacturing and charging. Furthermore, even when a high voltage (for example, the voltage equivalent to two or more battery cells) is required, a stacked all-solid-state battery using a solid electrolyte can easily achieve a high voltage by directly connecting multiple power generating elements in series within one battery cell. The batteries according to the first to fifth embodiments can realize stacked all-solid-state batteries that do not short-circuit the positive and negative electrodes even when multiple cells are stacked.

[0279] The methods for manufacturing the batteries in the first to fifth embodiments will be described later as the sixth and seventh embodiments.

[0280] (Sixth embodiment) The sixth embodiment will be described below. Descriptions that overlap with any of the first to fifth embodiments will be omitted as appropriate.

[0281] FIG. 23 is a diagram showing a schematic configuration of a battery manufacturing apparatus 6000 according to the sixth embodiment.

[0282] The battery manufacturing apparatus 6000 in the sixth embodiment includes a first electrode layer forming section 610, a second electrode layer forming section 620, and a laminating section 630.

[0283] The first electrode layer forming section 610 forms the first electrode layer 100 .

[0284] The first electrode layer forming section 610 contacts the first current collector 110 and forms the first active material layer 120 in an area narrower than the first current collector 110 .

[0285] The first electrode layer forming portion 610 contacts the first current collector 110 and the first active material layer 120 and forms the first solid electrolyte layer 130 in the same area as the first current collector 110 .

[0286] The second electrode layer forming section 620 forms the second electrode layer 200 .

[0287] The second electrode layer forming section 620 contacts the second current collector 210 and forms the second active material layer 220 in an area narrower than the second current collector 210 .

[0288] The second electrode layer forming section 620 contacts the second current collector 210 and the second active material layer 220 and forms the second solid electrolyte layer 230 in the same area as the second current collector 210 .

[0289] The laminated section 630 laminates the first electrode layer 100 and the second electrode layer 200 together. As a result, the laminated section 630 causes the first active material layer 120 to face the second active material layer 220 with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 interposed therebetween.

[0290] FIG. 24 is a flowchart showing a battery manufacturing method according to the sixth embodiment.

[0291] The battery manufacturing method according to the sixth embodiment is a battery manufacturing method using the battery manufacturing apparatus 6000 according to the sixth embodiment. For example, the battery manufacturing method according to the sixth embodiment is a battery manufacturing method executed in the battery manufacturing apparatus 6000 according to the sixth embodiment.

[0292] The battery manufacturing method in embodiment 6 includes a first active material layer forming step S1110 (=step (a1)), a first solid electrolyte layer forming step S1120 (=step (a2)), a second active material layer forming step S1210 (=step (b1)), a second solid electrolyte layer forming step S1220 (=step (b2)), and a lamination step S1310 (=step (c)).

[0293] The first active material layer forming step S1110 is a step in which the first electrode layer forming section 610 forms the first active material layer 120 in contact with the first current collector 110 in an area smaller than the first current collector 110.

[0294] The first solid electrolyte layer forming step S1120 is a step in which the first electrode layer forming section 610 forms the first solid electrolyte layer 130 in contact with the first current collector 110 and the first active material layer 120, in the same area as the first current collector 110. The first solid electrolyte layer forming step S1120 is a step that is performed after the first active material layer forming step S1110.

[0295] In the second active material layer forming step S1210, the second electrode layer forming unit 620 forms a second current collector 21 This is a step of forming a second active material layer 220 in contact with the second current collector 210 and in an area narrower than the second current collector 210.

[0296] The second solid electrolyte layer forming step S1220 is a step in which the second electrode layer forming section 620 forms the second solid electrolyte layer 230 in contact with the second current collector 210 and the second active material layer 220, in the same area as the second current collector 210. The second solid electrolyte layer forming step S1220 is a step that is performed after the second active material layer forming step S1210.

[0297] The lamination step S1310 is a step in which the first electrode layer 100 and the second electrode layer 200 are laminated on each other by the lamination unit 630, so that the first active material layer 120 faces the second active material layer 220 via the first solid electrolyte layer 130 and the second solid electrolyte layer 230. The lamination step S1310 is a step that is performed after the first solid electrolyte layer formation step S1120 and the second solid electrolyte layer formation step S1220.

[0298] According to the above manufacturing apparatus or manufacturing method, first solid electrolyte layer 130 is formed in the same area as first current collector 110, and second solid electrolyte layer 230 is formed in the same area as second current collector 210, and then first electrode layer 100 and second electrode layer 200 are laminated together. This makes it possible to further increase the positional stability of first current collector 110 and second current collector 210 and further reduce the possibility of contact between first current collector 110 and second current collector 210 even during battery manufacturing.

[0299] Furthermore, the manufacturing apparatus or method described above can reduce the possibility of contact between the first current collector 110 and the second current collector 210. That is, the opposing portions of the first current collector 110 and the second current collector 210 can be fixed by the first solid electrolyte layer 130 and the second solid electrolyte layer 230. For example, even if the first current collector 110 and the second current collector 210 are configured as thin films, the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can maintain the distance between the first current collector 110 and the second current collector 210 at a certain distance or more (for example, at least the thickness of the first solid electrolyte layer 130 and the second solid electrolyte layer 230). Therefore, the first current collector 110 and the second current collector 210 can be prevented from coming close to each other. This can prevent deformation of the first current collector 110 and the second current collector 210, for example, even when multiple battery cells are stacked. Therefore, for example, even when a plurality of battery cells are stacked, it is possible to prevent a short circuit between the first current collector 110 and the second current collector 210. Furthermore, for example, even in an all-solid-state battery that does not have a separator between the first electrode layer 100 and the second electrode layer 200, it is possible to reduce the risk of a short circuit caused by direct contact between the first current collector 110 and the second current collector 210.

[0300] Furthermore, the above manufacturing apparatus or manufacturing method eliminates the need for a separate member (for example, an insulating spacer) for insulating the first electrode layer 100 and the second electrode layer 200. This makes it possible to further simplify the battery manufacturing process and reduce costs.

[0301] Furthermore, according to the above manufacturing apparatus or manufacturing method, by providing a solid electrolyte layer formed by joining the first solid electrolyte layer 130 and the second solid electrolyte layer 230, it is possible to reduce the possibility of short circuits due to pinholes that may occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230 during manufacturing, for example.

[0302] In the above manufacturing method, a current collector having a first rounded portion 140 provided on its outer periphery may be used as the first current collector 110. In this case, the shape of the first rounded portion 140 (or the shape of the first current collector 110) may be any of the shapes shown in any of the first to fifth embodiments. In this case, the first solid electrolyte layer 130 is formed in the same area as the first current collector 110, so that the first rounded portion 140 is provided on the outer periphery of the first current collector 110 and the first solid electrolyte layer 130. In other words, a first electrode layer 100 having the first rounded portion 140 can be produced.

[0303] Furthermore, in the above manufacturing method, a current collector having second rounded portions 240 provided on its outer periphery may be used as the second current collector 210. In this case, the shape of the second rounded portions 240 (or the shape of the second current collector 210) may be any of the shapes shown in any of the above-mentioned Embodiments 1 to 5. In this case, by forming the second solid electrolyte layer 230 in the same area as the second current collector 210, the second rounded portions 240 are provided on the outer periphery of the second current collector 210 and the second solid electrolyte layer 230. In other words, a second electrode layer 200 having the second rounded portions 240 can be produced.

[0304] The third electrode layer 300 having the third rounded portion 340 and the fourth electrode layer 400 having the fourth rounded portion 440 can also be fabricated by the same method as above.

[0305] Furthermore, by changing the size of the main surface of the current collector prepared in advance, the size of the main surface of each electrode layer can be changed. This allows the shape of the rounded portions of each electrode layer to be the same. Alternatively, the shape of each electrode layer can be the same.

[0306] In addition, in the stacking step, the positions of the electrode layers to be stacked may be adjusted. This allows the electrode layers to be stacked with the ends of the rounded portions of the electrode layers aligned with each other. Alternatively, the electrode layers can be stacked with the ends of the electrode layers aligned with each other.

[0307] In the active material forming step, the area in which each active material layer is formed may be adjusted, thereby providing rounded portions at the edges of each active material layer.

[0308] In the battery manufacturing apparatus 6000 of the sixth embodiment, the second electrode layer forming section 620 may form the first active material layer 120 in an area wider than the second active material layer 220. In this case, the laminating section 630 may arrange the second active material layer 220 within the area where the first active material layer 120 is formed.

[0309] In other words, in the battery manufacturing method of embodiment 6, in the second active material layer forming step S1210, the second active material layer 220 may be formed by the second electrode layer forming section 620 in an area narrower than the first active material layer 120.

[0310] At this time, in the laminating step S1310, the laminating unit 630 may arrange the first active material layer 120 outside the area where the second active material layer 220 is to be formed.

[0311] The above manufacturing apparatus or manufacturing method can suppress the deposition of metal (for example, lithium) in the first active material layer 120. This makes it possible to prevent a short circuit between the first electrode layer 100 and the second electrode layer 200 caused by the deposition of metal.

[0312] In the sixth embodiment, as shown in FIG. 24, the second active material layer-forming step S1210 and the second solid electrolyte layer-forming step S1220 may be performed after the first active material layer-forming step S1110 and the first solid electrolyte layer-forming step S1120.

[0313] Alternatively, the second active material layer forming step S1210 and the second solid electrolyte layer forming step S1220 may be performed before the first active material layer forming step S1110 and the first solid electrolyte layer forming step S1120.

[0314] Alternatively, the second active material layer forming step S1210 and the second solid electrolyte layer forming step S1220 may be performed simultaneously with the first active material layer forming step S1110 and the first solid electrolyte layer forming step S1120. It may be executed as follows.

[0315] A specific example of the battery manufacturing method according to the sixth embodiment will be described below.

[0316] FIG. 25 is a diagram showing an example of the first active material layer forming step S1110 and the first solid electrolyte layer forming step S1120.

[0317] The first active material layer 120 is formed on a first current collector 110 prepared in advance. For example, a paste-like paint prepared by kneading an active material (and other materials) with a predetermined solvent is applied onto the first current collector 110 using a coating device or the like (and may be dried). At this time, the first active material layer 120 is formed in contact with the first current collector 110 and in an area smaller than the first current collector 110 (first active material layer forming step S1110). As a result, the first active material layer 120 is formed on the first current collector 110 so that the first current collector 110 is exposed to the surroundings.

[0318] The first solid electrolyte layer 130 is formed on the first current collector 110 on which the first active material layer 120 is formed. For example, a paste-like paint prepared by kneading a solid electrolyte (and other materials) with a predetermined solvent is applied onto the first active material layer 120 and the first current collector 110 using a coating device or the like (and may be dried). At this time, the first solid electrolyte layer 130 is formed in the same area as the first current collector 110 (first solid electrolyte layer forming step S1120). As a result, the first solid electrolyte layer 130 is formed on the exposed first current collector 110 while covering the first active material layer 120. As a result, the first electrode layer 100 (e.g., an electrode plate) is produced.

[0319] FIG. 26 is a diagram showing an example of the second active material layer forming step S1210 and the second solid electrolyte layer forming step S1220.

[0320] The second active material layer 220 is formed on a second current collector 210 prepared in advance. For example, a paste-like paint prepared by kneading an active material (and other materials) with a predetermined solvent is applied onto the second current collector 210 using a coating device or the like (and may be dried). At this time, the second active material layer 220 is formed in contact with the second current collector 210 and over an area smaller than the second current collector 210 (second active material layer forming step S1210). As a result, the second active material layer 220 is formed on the second current collector 210 so that the second current collector 210 is exposed to the surroundings. Note that in the example shown in FIG. 26, the second active material layer 220 is formed over an area larger than the first active material layer 120 (i.e., over an area larger than the formation area of ​​the first active material layer 120).

[0321] The second solid electrolyte layer 230 is formed on the second current collector 210 on which the second active material layer 220 is formed. For example, a paste-like paint prepared by kneading a solid electrolyte (and other materials) with a predetermined solvent is applied onto the second active material layer 220 and the second current collector 210 using a coating device or the like (and may be dried). At this time, the second solid electrolyte layer 230 is formed in the same area as the second current collector 210 (second solid electrolyte layer forming step S1220). As a result, the second solid electrolyte layer 230 is formed on the exposed second current collector 210 while covering the second active material layer 220. As a result, the second electrode layer 200 (e.g., an electrode plate) is produced.

[0322] FIG. 27 is a diagram showing an example of the laminating step S1310.

[0323] The first electrode layer 100 and the second electrode layer 200 are positioned facing each other using a conveying device or the like. Then, they are brought into contact with each other to laminate the first electrode layer 100 and the second electrode layer 200. As a result, the first active material layer 120 faces the second active material layer 220 via the first solid electrolyte layer 130 and the second solid electrolyte layer 230 (lamination). Step S1310).

[0324] The contact portion between the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can be bonded by a drying process, a pressure welding process, or the like.

[0325] In the lamination step S1310, the entire area of ​​the main surface of the first solid electrolyte layer 130 and the entire area of ​​the main surface of the second solid electrolyte layer 230 may be brought into contact with each other (and may then be bonded together). Alternatively, a partial area of ​​the main surface of the first solid electrolyte layer 130 (e.g., more than half of the area of ​​the main surface) and a partial area of ​​the main surface of the second solid electrolyte layer 230 (e.g., more than half of the area of ​​the main surface) may be brought into contact with each other (and may then be bonded together).

[0326] FIG. 28 is a flowchart showing a modification of the battery manufacturing method according to the sixth embodiment.

[0327] In the sixth embodiment, as shown in FIG. 23, the battery manufacturing apparatus 6000 may further include a pressing unit 640.

[0328] The pressing section 640 presses the first electrode layer 100 and the second electrode layer 200 that are stacked on top of each other, thereby joining the first solid electrolyte layer 130 and the second solid electrolyte layer 230 together.

[0329] In other words, the battery manufacturing method according to the sixth embodiment may further include a pressing step S1410 (=step (d)) as shown in Fig. 28. The pressing step S1410 may be performed after the stacking step S1310.

[0330] The pressing step S1410 is a step of joining (press-welding) the first solid electrolyte layer 130 and the second solid electrolyte layer 230 by pressing the stacked first electrode layer 100 and second electrode layer 200 together using the press unit 640.

[0331] According to the above manufacturing apparatus or manufacturing method, the first solid electrolyte layer 130 and the second solid electrolyte layer 230 are pressed together, thereby making it possible to further strengthen the bond between the first solid electrolyte layer 130 and the second solid electrolyte layer 230. Furthermore, it is possible to further reduce the possibility of short circuits due to pinholes that may occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230.

[0332] FIG. 29 is a diagram showing a schematic configuration of a battery manufacturing apparatus 6100 according to the sixth embodiment.

[0333] In battery manufacturing apparatus 6100 in the sixth embodiment, first electrode layer forming section 610 includes first solid electrolyte layer forming section 611 and first electrode side cutting section 612.

[0334] The first solid electrolyte layer forming portion 611 contacts the first current collector 110 and the first active material layer 120 to form the first solid electrolyte layer 130.

[0335] First electrode-side cutting portion 612 cuts first current collector 110 together with first solid electrolyte layer 130 , so that the area where first solid electrolyte layer 130 is formed is the same as the area where first current collector 110 is formed.

[0336] In battery manufacturing apparatus 6100 in the sixth embodiment, second electrode layer forming section 620 includes second solid electrolyte layer forming section 621 and second electrode-side cutting section 622.

[0337] The second solid electrolyte layer forming portion 621 contacts the second current collector 210 and the second active material layer 220 to form the second solid electrolyte layer 230.

[0338] The second electrode-side cutting portion 622 cuts the second current collector 210 together with the second solid electrolyte layer 230 , so that the area where the second solid electrolyte layer 230 is formed is the same as the area where the second current collector 210 is formed.

[0339] FIG. 30 is a flowchart showing a modification of the battery manufacturing method according to the sixth embodiment.

[0340] The battery manufacturing method shown in Fig. 30 is a battery manufacturing method using battery manufacturing apparatus 6100 in accordance with Embodiment 6. For example, the battery manufacturing method shown in Fig. 30 is a battery manufacturing method performed in battery manufacturing apparatus 6100 in accordance with Embodiment 6.

[0341] In the battery manufacturing method shown in FIG. 30, the first solid electrolyte layer forming step S1120 (=step (a2)) includes a first solid electrolyte layer forming step S1121 (=step (a21)) and a first electrode side cutting step S1122 (=step (a22)).

[0342] The first solid electrolyte layer forming step S1121 is a step in which the first solid electrolyte layer forming unit 611 forms the first solid electrolyte layer 130 in contact with the first current collector 110 and the first active material layer 120.

[0343] The first electrode-side cutting step S1122 is a step in which the first current collector 110 is cut together with the first solid electrolyte layer 130 by the first electrode-side cutting part 612, so that the formation area of ​​the first solid electrolyte layer 130 is the same as the first current collector 110. The first electrode-side cutting step S1122 is a step that is performed after the first solid electrolyte layer formation step S1121.

[0344] According to the above manufacturing apparatus or manufacturing method, the first solid electrolyte layer 130 and the first current collector 110 can be formed in the same area through a simple cutting process, which makes the battery manufacturing process simpler and less expensive.

[0345] In battery manufacturing apparatus 6100 in Embodiment 6, first electrode layer forming section 610 may include a first active material layer forming section 613. First active material layer forming section 613 forms first active material layer 120. That is, in first active material layer forming step S1110, first active material layer 120 may be formed by first active material layer forming section 613.

[0346] In battery manufacturing apparatus 6100 in embodiment 6, second electrode layer forming section 620 may include second active material layer forming section 623. Second active material layer forming section 623 forms second active material layer 220. That is, in second active material layer forming step S1210, second active material layer 220 may be formed by second active material layer forming section 623.

[0347] FIG. 31 is a diagram showing an example of the first solid electrolyte layer forming step S1121 and the first electrode side cutting step S1122.

[0348] The first solid electrolyte layer 130 is formed on the first current collector 110 on which the first active material layer 120 is formed. For example, a paste-like paint prepared by kneading a solid electrolyte (and other materials) with a predetermined solvent is applied onto the first active material layer 120 and the first current collector 110 using a coating device or the like (and may be dried). At this time, the first solid electrolyte layer 130 is formed in an area narrower than the first current collector 110 (first solid electrolyte layer forming step S1121).

[0349] The first current collector 110 on which the first solid electrolyte layer 130 is formed is cut using a cutting device or the like. The first current collector 110 is cut together with the first solid electrolyte layer 130 (for example, cut at the positions of C11 and C12). As a result, the area where the first solid electrolyte layer 130 is formed becomes the same area as the first current collector 110 (first electrode side cutting step S1122). In this way, the first electrode layer 100 (for example, an electrode plate) is produced.

[0350] In the first electrode side cutting step S1122, cutting may be performed by simultaneously punching out the first current collector 110 and the first solid electrolyte layer 130. At this time, all four edges of the first current collector 110 and the first solid electrolyte layer 130 may be cut simultaneously.

[0351] In the first electrode side cutting step S1122, cutting may be performed so that the area and shape of the main surface of the first electrode layer 100 are the same as the area and shape of the main surface of the second electrode layer 200.

[0352] In addition, in the battery manufacturing method shown in FIG. 30, the second solid electrolyte layer forming step S1220 (=step (b2)) includes a second solid electrolyte layer forming step S1221 (=step (b21)) and a second electrode side cutting step S1222 (=step (b22)).

[0353] The second solid electrolyte layer forming step S1221 is a step in which the second solid electrolyte layer forming unit 621 forms the second solid electrolyte layer 230 in contact with the second current collector 210 and the second active material layer 220.

[0354] The second electrode-side cutting step S1222 is a step in which the second current collector 210 is cut together with the second solid electrolyte layer 230 by the second electrode-side cutting part 622, so that the formation area of ​​the second solid electrolyte layer 230 is the same as the area of ​​the second current collector 210. The second electrode-side cutting step S1222 is a step that is performed after the second solid electrolyte layer formation step S1221.

[0355] According to the above configuration, the second solid electrolyte layer 230 and the second current collector 210 can be formed in the same area through a simple cutting process, which makes it possible to further simplify the battery manufacturing process and reduce costs.

[0356] FIG. 32 is a diagram showing an example of the second solid electrolyte layer forming step S1221 and the second electrode side cutting step S1222.

[0357] The second solid electrolyte layer 230 is formed on the second current collector 210 on which the second active material layer 220 is formed. For example, a paste-like paint prepared by kneading a solid electrolyte (and other materials) with a predetermined solvent is applied onto the second active material layer 220 and the second current collector 210 using a coating device or the like (and may be dried). At this time, the second solid electrolyte layer 230 is formed in an area narrower than the second current collector 210 (second solid electrolyte layer forming step S1221).

[0358] The second current collector 210 on which the second solid electrolyte layer 230 is formed is cut using a cutting device or the like. The second current collector 210 is cut together with the second solid electrolyte layer 230 (for example, cut at the positions of C21 and C22). As a result, the formation area of ​​the second solid electrolyte layer 230 becomes the same area as the second current collector 210 (second electrode-side cutting step S1222). As a result, the second electrode layer 200 (for example, an electrode plate) is produced.

[0359] In the second electrode side cutting step S1222, cutting may be performed by simultaneously punching out second current collector 210 and second solid electrolyte layer 230. At this time, all four edges of second current collector 210 and second solid electrolyte layer 230 may be cut simultaneously.

[0360] In the second electrode side cutting step S1222, cutting may be performed so that the area and shape of the main surface of the second electrode layer 200 are the same as the area and shape of the main surface of the first electrode layer 100.

[0361] In the above manufacturing method, in the first electrode side cutting step S1122, cutting may be performed so that the shape of first rounded portion 140 (or the shape of first electrode layer 100) becomes the shape shown in any of the above-mentioned Embodiments 1 to 5. In this way, first electrode layer 100 having first rounded portion 140 can be manufactured.

[0362] In the above manufacturing method, in the second electrode side cutting step S1222, cutting may be performed so that the shape of second rounded portion 240 (or the shape of second electrode layer 200) becomes the shape shown in any of the above-mentioned Embodiments 1 to 5. In this way, second electrode layer 200 having second rounded portion 240 can be manufactured.

[0363] The third electrode layer 300 having the third rounded portion 340 and the fourth electrode layer 400 having the fourth rounded portion 440 can also be fabricated by the same cutting method as above.

[0364] Furthermore, by changing the cutting area of ​​each electrode layer, the size of the main surface of each electrode layer can be changed. This allows the shape of the rounded portions of each electrode layer to be the same. This allows, for example, the electrode layers to be stacked in a state where the ends of the rounded portions of each electrode layer are aligned. Alternatively, the shapes of each electrode layer can be made the same. This allows, for example, the electrode layers to be stacked in a state where the ends of each electrode layer are aligned.

[0365] In the sixth embodiment, first electrode layer forming section 610 (e.g., first solid electrolyte layer forming section 611 and first active material layer forming section 613) and second electrode layer forming section 620 (e.g., second solid electrolyte layer forming section 621 and second active material layer forming section 623) may each include, for example, a discharge mechanism (e.g., a discharge port) that discharges a coating agent (e.g., an active material or a solid electrolyte material), a supply mechanism (e.g., a tank and a supply pipe) that supplies the coating agent to the discharge mechanism, a moving mechanism (e.g., a roller) that moves the object to be coated, a pressing mechanism (e.g., a press table and a cylinder) that applies pressure, etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0366] In addition, in the sixth embodiment, first electrode side cutting unit 612 and second electrode side cutting unit 622 may each include, for example, a cutting mechanism (e.g., a die punch device) that cuts the object to be cut, a moving mechanism (e.g., a roller) that moves the object to be cut, etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0367] In addition, in the sixth embodiment, the lamination unit 630 may include a conveyance mechanism (for example, a roller) for conveying the first electrode layer 100 and the second electrode layer 200 to be laminated. Generally known devices and members can be used as appropriate for these mechanisms.

[0368] In the sixth embodiment, the pressing unit 640 may include a pressing mechanism (for example, a press table and a cylinder) that applies pressure to the laminate of the first electrode layer 100 and the second electrode layer 200, a moving mechanism (for example, a roller) that moves the first electrode layer 100 and the second electrode layer 200 that are to be pressed, etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0369] The battery manufacturing apparatus in Embodiment 6 may further include control unit 650. Control unit 650 controls the operations of first electrode layer forming unit 610 (e.g., first solid electrolyte layer forming unit 611 and first electrode-side cutting unit 612), second electrode layer forming unit 620 (e.g., second solid electrolyte layer forming unit 621 and second electrode-side cutting unit 622), stacking unit 630, and pressing unit 640.

[0370] Control unit 650 may be configured with, for example, a processor and a memory. The processor may be, for example, a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). In this case, the processor may execute the control method (battery manufacturing method) disclosed in the present disclosure by reading and executing a program stored in the memory.

[0371] (Embodiment 7) The seventh embodiment will be described below. Descriptions that overlap with any of the first to sixth embodiments will be omitted as appropriate.

[0372] FIG. 33 is a diagram showing a schematic configuration of a battery manufacturing apparatus 7000 according to the seventh embodiment.

[0373] The battery manufacturing apparatus 7000 in the seventh embodiment includes a first electrode layer forming section 710, a second electrode layer forming section 720, a stacking section 730, and a cutting section 760.

[0374] The first electrode layer forming section 710 forms the first electrode layer 100 .

[0375] The first electrode layer forming section 710 contacts the first current collector 110 and forms the first active material layer 120 in an area narrower than the first current collector 110 .

[0376] The first electrode layer forming portion 710 contacts the first current collector 110 and the first active material layer 120 to form the first solid electrolyte layer 130.

[0377] The second electrode layer forming section 720 forms the second electrode layer 200 .

[0378] The second electrode layer forming section 720 contacts the second current collector 210 and forms the second active material layer 220 in an area narrower than the second current collector 210 .

[0379] The second electrode layer forming portion 720 contacts the second current collector 210 and the second active material layer 220 to form the second solid electrolyte layer 230.

[0380] The laminated section 730 laminates the first electrode layer 100 and the second electrode layer 200 together. As a result, the laminated section 730 causes the first active material layer 120 to face the second active material layer 220 with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 interposed therebetween.

[0381] The cutting unit 760 cuts the first current collector 110 and the second current collector 210 as well as the first solid electrolyte layer 130 and the second solid electrolyte layer 230. As a result, the cutting unit 760 makes the area where the first solid electrolyte layer 130 is formed the same as the area where the first current collector 110 is formed, and makes the area where the second solid electrolyte layer 230 is formed the same as the area where the second current collector 210 is formed.

[0382] FIG. 34 is a flowchart showing a battery manufacturing method according to the seventh embodiment.

[0383] The battery manufacturing method according to the seventh embodiment is a battery manufacturing method using the battery manufacturing apparatus 7000 according to the seventh embodiment. For example, the battery manufacturing method according to the seventh embodiment is a battery manufacturing method executed in the battery manufacturing apparatus 7000 according to the seventh embodiment.

[0384] The battery manufacturing method in the seventh embodiment includes a first active material layer forming step S2110 (=step (e1)), a first solid electrolyte layer forming step S2120 (=step (e2)), a second active material layer forming step S2210 (=step (f1)), a second solid electrolyte layer forming step S2220 (=step (f2)), a laminating step S2310 (=step (g)), and a cutting step S2510 (=step ( h)) and includes.

[0385] The first active material layer forming step S2110 is a step in which the first electrode layer forming section 710 forms the first active material layer 120 in contact with the first current collector 110 in an area smaller than the first current collector 110.

[0386] The first solid electrolyte layer forming step S2120 is a step in which the first electrode layer forming section 710 forms the first solid electrolyte layer 130 in contact with the first current collector 110 and the first active material layer 120. The first solid electrolyte layer forming step S2120 is a step that is performed after the first active material layer forming step S2110.

[0387] The second active material layer forming step S2210 is a step in which the second electrode layer forming section 720 forms the second active material layer 220 in contact with the second current collector 210 and in an area narrower than the second current collector 210.

[0388] The second solid electrolyte layer forming step S2220 is a step in which the second electrode layer forming section 720 forms the second solid electrolyte layer 230 in contact with the second current collector 210 and the second active material layer 220. The second solid electrolyte layer forming step S2220 is a step that is performed after the second active material layer forming step S2210.

[0389] The lamination step S2310 is a step in which the first electrode layer 100 and the second electrode layer 200 are laminated on each other by the lamination unit 730, so that the first active material layer 120 faces the second active material layer 220 via the first solid electrolyte layer 130 and the second solid electrolyte layer 230. The lamination step S2310 is a step that is performed after the first solid electrolyte layer formation step S2120 and the second solid electrolyte layer formation step S2220.

[0390] The cutting step S2510 is a step in which the first current collector 110 and the second current collector 210 are cut together with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 by the cutting unit 760, so that the formation area of ​​the first solid electrolyte layer 130 is the same as the first current collector 110, and the formation area of ​​the second solid electrolyte layer 230 is the same as the second current collector 210. The cutting step S2510 is a step that is performed after the stacking step S2310.

[0391] According to the manufacturing apparatus or manufacturing method described above, by performing cutting after stacking the first electrode layer 100 and the second electrode layer 200, alignment of the first electrode layer 100 and the second electrode layer 200 becomes easier. Furthermore, for example, the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230 can be cut simultaneously. This allows the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230 to be formed in the same area. This further improves the positional stability of the first current collector 110 and the second current collector 210 and further reduces the possibility of contact between the first current collector 110 and the second current collector 210.

[0392] Furthermore, the manufacturing apparatus or method described above can reduce the possibility of contact between the first current collector 110 and the second current collector 210. That is, the opposing portions of the first current collector 110 and the second current collector 210 can be fixed by the first solid electrolyte layer 130 and the second solid electrolyte layer 230. For example, even if the first current collector 110 and the second current collector 210 are configured as thin films, the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can maintain the distance between the first current collector 110 and the second current collector 210 at a certain distance or more (for example, at least the thickness of the first solid electrolyte layer 130 and the second solid electrolyte layer 230). Therefore, the first current collector 110 and the second current collector 210 can be prevented from coming close to each other. This can prevent deformation of the first current collector 110 and the second current collector 210, for example, even when multiple battery cells are stacked. Therefore Therefore, even when a plurality of battery cells are stacked, for example, it is possible to prevent a short circuit between the first current collector 110 and the second current collector 210. Furthermore, even in an all-solid-state battery that does not have a separator between the first electrode layer 100 and the second electrode layer 200, for example, it is possible to reduce the risk of a short circuit caused by direct contact between the first current collector 110 and the second current collector 210.

[0393] Furthermore, the above manufacturing apparatus or manufacturing method eliminates the need for a separate member (for example, an insulating spacer) for insulating the first electrode layer 100 and the second electrode layer 200. This makes it possible to further simplify the battery manufacturing process and reduce costs.

[0394] Furthermore, according to the above manufacturing apparatus or manufacturing method, by providing a solid electrolyte layer formed by joining the first solid electrolyte layer 130 and the second solid electrolyte layer 230, it is possible to reduce the possibility of short circuits due to pinholes that may occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230 during manufacturing, for example.

[0395] Furthermore, with the above-described manufacturing apparatus or manufacturing method, the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230 can be formed in the same area through a simple cutting process, thereby further simplifying the battery manufacturing process and reducing costs.

[0396] In the above manufacturing method, in the cutting step S2510, cutting may be performed so that the shape of the rounded portion of each electrode layer (or the shape of each electrode layer) becomes the shape shown in any of the above-mentioned embodiments 1 to 5. This makes it possible to manufacture a stacked battery in which electrode layers having rounded portions are stacked.

[0397] The third electrode layer 300 having the third rounded portion 340 and the fourth electrode layer 400 having the fourth rounded portion 440 can also be fabricated by the same cutting method as above.

[0398] Furthermore, according to the cutting step S2510, the shapes of the rounded portions of the electrode layers can be made to be the same. As a result, for example, the electrode layers can be stacked with the ends of the rounded portions of the electrode layers aligned. Alternatively, according to the cutting step S2510, the shapes of the electrode layers can be made to be the same. As a result, for example, the electrode layers can be stacked with the ends of the electrode layers aligned.

[0399] In the battery manufacturing apparatus 7000 of the seventh embodiment, the second electrode layer forming section 720 may form the first active material layer 120 in an area wider than the second active material layer 220. In this case, the laminating section 730 may arrange the second active material layer 220 within the area where the first active material layer 120 is formed.

[0400] In other words, in the battery manufacturing method of embodiment 7, in the second active material layer forming step S2210, the second active material layer 220 may be formed by the second electrode layer forming section 720 in an area narrower than the first active material layer 120.

[0401] At this time, in the laminating step S2310, the laminating unit 730 may arrange the first active material layer 120 outside the area where the second active material layer 220 is to be formed.

[0402] The above configuration can suppress the deposition of metal (for example, lithium) in the first active material layer 120. This can prevent a short circuit between the first electrode layer 100 and the second electrode layer 200 caused by the deposition of metal.

[0403] In the seventh embodiment, as shown in FIG. 34, the second active material layer-forming step S2210 and the second solid electrolyte layer-forming step S2220 may be performed after the first active material layer-forming step S2110 and the first solid electrolyte layer-forming step S2120.

[0404] Alternatively, the second active material layer forming step S2210 and the second solid electrolyte layer forming step S2220 may be performed before the first active material layer forming step S2110 and the first solid electrolyte layer forming step S2120.

[0405] Alternatively, the second active material layer forming step S2210 and the second solid electrolyte layer forming step S2220 may be carried out simultaneously in parallel with the first active material layer forming step S2110 and the first solid electrolyte layer forming step S2120.

[0406] A specific example of the battery manufacturing method according to the seventh embodiment will be described below.

[0407] FIG. 35 is a diagram showing an example of the first active material layer forming step S2110 and the first solid electrolyte layer forming step S2120.

[0408] The first active material layer 120 is formed on a first current collector 110 prepared in advance. For example, a paste-like paint prepared by kneading an active material (and other materials) with a predetermined solvent is applied onto the first current collector 110 using a coating device or the like (and may be dried). At this time, the first active material layer 120 is formed in contact with the first current collector 110 and in an area smaller than the first current collector 110 (first active material layer forming step S2110). As a result, the first active material layer 120 is formed on the first current collector 110 so that the first current collector 110 is exposed to the surroundings.

[0409] The first solid electrolyte layer 130 is formed on the first current collector 110 on which the first active material layer 120 is formed. For example, a paste-like paint prepared by kneading a solid electrolyte (and other materials) with a predetermined solvent is applied onto the first active material layer 120 and the first current collector 110 using a coating device or the like (and may be dried). At this time, the first solid electrolyte layer 130 is formed in an area narrower than the first current collector 110 (first solid electrolyte layer forming step S2120). As a result, the first solid electrolyte layer 130 is formed on the exposed first current collector 110 while covering the first active material layer 120. As a result, the first electrode layer 100 (e.g., an electrode plate) is produced.

[0410] FIG. 36 is a diagram showing an example of the second active material layer forming step S2210 and the second solid electrolyte layer forming step S2220.

[0411] The second active material layer 220 is formed on a second current collector 210 prepared in advance. For example, a paste-like paint prepared by kneading an active material (and other materials) with a predetermined solvent is applied onto the second current collector 210 using a coating device or the like (and may be dried). At this time, the second active material layer 220 is formed in contact with the second current collector 210 and over an area smaller than the second current collector 210 (second active material layer forming step S2210). As a result, the second active material layer 220 is formed on the second current collector 210 so that the second current collector 210 is exposed to the surroundings. In the example shown in FIG. 36, the second active material layer 220 is formed over an area larger than the first active material layer 120 (i.e., over an area larger than the formation area of ​​the first active material layer 120).

[0412] The second solid electrolyte layer 230 is formed on the second current collector 210 on which the second active material layer 220 is formed. For example, a paste-like paint in which a solid electrolyte (and other materials) is kneaded with a predetermined solvent is applied onto the second active material layer 220 and the second current collector 210 using a coating device or the like (and may be dried). At this time, the second solid electrolyte layer 230 is formed in an area narrower than the second current collector 210 (second solid electrolyte layer forming step S2220). This As a result, the second solid electrolyte layer 230 is formed on the exposed second current collector 210 while covering the second active material layer 220. In this way, the second electrode layer 200 (for example, an electrode plate) is produced.

[0413] FIG. 37 is a diagram showing an example of the laminating step S2310.

[0414] The first electrode layer 100 and the second electrode layer 200 thus fabricated are positioned facing each other using a conveying device or the like. Then, the first electrode layer 100 and the second electrode layer 200 are laminated by contacting them. As a result, the first active material layer 120 faces the second active material layer 220 via the first solid electrolyte layer 130 and the second solid electrolyte layer 230 (lamination step S2310).

[0415] FIG. 38 is a diagram showing an example of the cutting step S2510.

[0416] The laminate of the first electrode layer 100 and the second electrode layer 200 is cut using a cutting device or the like. The first current collector 110 and the second current collector 210 are cut together with the first solid electrolyte layer 130 and the second solid electrolyte layer 230 (for example, cutting is performed at the positions C31 and C32). As a result, the formation area of ​​the first solid electrolyte layer 130 becomes the same area as the first current collector 110, and the formation area of ​​the second solid electrolyte layer 230 becomes the same area as the second current collector 210 (cutting step S2510).

[0417] The contact portion between the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can be bonded by a drying process, a pressure welding process, or the like.

[0418] In the cutting step S2510, the cutting may be performed by simultaneously punching out the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230. At this time, the four edges of the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230 may be cut simultaneously.

[0419] In the lamination step S2310, the entire area of ​​the main surface of the first solid electrolyte layer 130 and the entire area of ​​the main surface of the second solid electrolyte layer 230 may be brought into contact with each other (and may then be bonded together). Alternatively, a partial area of ​​the main surface of the first solid electrolyte layer 130 (e.g., more than half of the main surface) and a partial area of ​​the main surface of the second solid electrolyte layer 230 (e.g., more than half of the main surface) may be brought into contact with each other (and may then be bonded together).

[0420] FIG. 39 is a flowchart showing a modification of the battery manufacturing method according to the seventh embodiment.

[0421] In the seventh embodiment, as shown in FIG. 33, a battery manufacturing apparatus 7000 may further include a pressing unit 740.

[0422] The pressing section 740 presses the first electrode layer 100 and the second electrode layer 200 that are stacked on top of each other, thereby joining the first solid electrolyte layer 130 and the second solid electrolyte layer 230 together.

[0423] In other words, the battery manufacturing method according to the seventh embodiment may further include a pressing step S2410 (=step (p)) as shown in FIG.

[0424] The pressing step S2410 is a step of pressing the stacked first electrode layer 100 and second electrode layer 200 together using a press unit 740, thereby joining (press-welding) the first solid electrolyte layer 130 and the second solid electrolyte layer 230 together.

[0425] According to the above manufacturing apparatus or manufacturing method, the first solid electrolyte layer 130 and the second solid electrolyte layer 230 are pressed together, thereby making it possible to further strengthen the bond between the first solid electrolyte layer 130 and the second solid electrolyte layer 230. Furthermore, it is possible to further reduce the possibility of short circuits due to pinholes that may occur in the first solid electrolyte layer 130 and the second solid electrolyte layer 230.

[0426] In the battery manufacturing method according to the seventh embodiment, as shown in FIG. 39, the cutting step S2510 may be performed after the pressing step S2410.

[0427] According to the above configuration, even if the first solid electrolyte layer 130 and the second solid electrolyte layer 230 expand during the pressing process, the expansion (excess portions) of the first solid electrolyte layer 130 and the second solid electrolyte layer 230 can be removed by the subsequent cutting process. This allows the first current collector 110, the first solid electrolyte layer 130, the second current collector 210, and the second solid electrolyte layer 230 to be formed in the same area. This further improves the positional stability of the first current collector 110 and the second current collector 210, and further reduces the possibility of contact between the first current collector 110 and the second current collector 210.

[0428] In the seventh embodiment, the first electrode layer forming unit 710 and the second electrode layer forming unit 720 may each include, for example, a discharge mechanism (e.g., a discharge port) that discharges a coating agent (e.g., an active substance material or a solid electrolyte material), a supply mechanism (e.g., a tank and a supply pipe) that supplies the coating agent to the discharge mechanism, a moving mechanism (e.g., a roller) that moves the object to be coated, a pressing mechanism (e.g., a press table and a cylinder), etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0429] In addition, in the seventh embodiment, the stacking unit 730 may include a transport mechanism (for example, a roller) for transporting the first electrode layer 100 and the second electrode layer 200 to be stacked. Generally known devices and members can be used as appropriate for these mechanisms.

[0430] In addition, in the seventh embodiment, the pressing unit 740 may include a pressing mechanism (for example, a press table and a cylinder) that presses and compresses the laminate of the first electrode layer 100 and the second electrode layer 200, a moving mechanism (for example, a roller) that moves the first electrode layer 100 and the second electrode layer 200 that are to be pressed, etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0431] In the seventh embodiment, the cutting unit 760 may include, for example, a cutting mechanism (such as a die punch device) that cuts the object to be cut, a moving mechanism (such as a roller) that moves the object to be cut, etc. Generally known devices and members can be used as appropriate for these mechanisms.

[0432] Moreover, the battery manufacturing apparatus 7000 in the seventh embodiment may further include a control unit 750.

[0433] The control unit 750 controls the operations of the first electrode layer forming unit 710 , the second electrode layer forming unit 720 , the laminating unit 730 , the pressing unit 740 , and the cutting unit 760 .

[0434] The control unit 750 may be configured with, for example, a processor and a memory. The processor may be, for example, a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). In this case, the processor may execute the control method (battery manufacturing method) disclosed in the present disclosure by reading and executing a program stored in the memory.

[0435] In the sixth and seventh embodiments, the step of forming the first electrode layer 100 or the second electrode layer 200 may include a step of dissolving an active material in a solvent (or mixing a dispersed binder) to prepare a slurry. A solid electrolyte or a conductive additive may be mixed into the slurry. In this case, the step of forming the first electrode layer 100 or the second electrode layer 200 may use a known coating method such as a doctor blade method, a roll coater method, a bar coater method, a calendar printing method, or a screen printing method.

[0436] In the sixth and seventh embodiments, the step of forming the solid electrolyte layer may include a step of dissolving the solid electrolyte in a solvent (or mixing a dispersed binder) to prepare a slurry. In this case, the step of forming the solid electrolyte layer may be performed using a known coating method such as a doctor blade method, a roll coater method, a bar coater method, a calendar printing method, or a screen printing method.

[0437] In the sixth and seventh embodiments, the cutting step can be performed using a known cutting method such as a punching method (for example, a die punch).

[0438] In the sixth and seventh embodiments, the pressing step (e.g., pressure welding step) may be performed using a known pressing method such as uniaxial pressing, roll pressing, cold isostatic pressing (CIP), hot isostatic pressing, etc. When using uniaxial pressing or roll pressing, a heating step may be performed.

[0439] In addition, in the sixth and seventh embodiments, "the area where the solid electrolyte layer is formed is the same as that of the current collector" means "the area where the solid electrolyte layer is formed is substantially the same as that of the current collector, except for errors that inevitably occur in manufacturing" (for example, the shape of the solid electrolyte layer is substantially the same as that of the current collector, except for errors that inevitably occur in manufacturing).

[0440] In addition, in the sixth and seventh embodiments, it is not necessary to form a solid electrolyte layer on one of the electrode layers to be laminated, thereby making it possible to fabricate the battery in the third embodiment.

[0441] In addition, in the sixth and seventh embodiments, the lamination surfaces of the electrode layers to be laminated may be adjusted in the lamination step. For example, the battery 4000 in the fourth embodiment can be fabricated by laminating current collectors together. At this time, electrode layers can be further laminated on both sides to fabricate the stacked battery in the fourth embodiment.

[0442] In addition, in the sixth and seventh embodiments, a counter electrode layer may be formed on one main surface of a current collector having an active material layer and a solid electrolyte layer formed on the other main surface. This allows the battery 5000 of the fifth embodiment to be produced. In this case, by further stacking electrode layers on both sides, the stacked battery of the fifth embodiment can be produced.

[0443] In the present disclosure, the first rounded portion 140 may be "a portion having a smaller radius than the radius of the corner of the first active material layer 120 that is closest to the first rounded portion 140" (i.e., a portion having a larger curvature than the curvature of the corner of the first active material layer 120 that is closest to the first rounded portion 140).

[0444] 1, the corner of first active material layer 120 (e.g., an active material layer formed in a polygonal shape) that is closest to first rounded portion 140 may be a portion having an angle of 90 degrees or less (e.g., a right angle or an acute angle). In this case, first rounded portion 140 may be a portion that is cut in a curved shape.

[0445] 3, the corners of the first active material layer 120 (e.g., an active material layer formed in a polygonal shape) that are closest to each of the first rounded portions (140a, 140b, 140c, 140d) may be portions having an angle of 90 degrees or less (e.g., right angles or acute angles). In this case, each of the first rounded portions (140a, 140b, 140c, 140d) may be a portion that has been cut in a curved shape.

[0446] In the present disclosure, first rounded portion 140 may be "a portion having an angle greater than the angle of the corner of first active material layer 120 that is closest to first rounded portion 140."

[0447] 2, the corner of first active material layer 120 (e.g., an active material layer formed in a polygonal shape) that is closest to first rounded portion 140 may be a portion having an angle of 90 degrees or less (e.g., a right angle or an acute angle).In this case, first rounded portion 140 may be a portion that is cut in a straight line so as to have only angles greater than 90 degrees (e.g., obtuse angles).

[0448] 5(c), the corners of the first active material layer 120 (e.g., an active material layer formed in a polygonal shape) that are closest to each of the first rounded portions (140a, 140b, 140c, 140d) may be portions having angles of 90 degrees or less (e.g., right angles or acute angles). In this case, each of the first rounded portions (140a, 140b, 140c, 140d) may be portions that are cut linearly so as to have only angles greater than 90 degrees (e.g., obtuse angles).

[0449] As described above, by having first rounded portion 140 be "a portion having a smaller radius than the radius of the corner of first active material layer 120 closest to first rounded portion 140" or "a portion having a larger angle than the angle of the corner of first active material layer 120 closest to first rounded portion 140," first active material layer 120 can be arranged in as large an area as possible (for example, a polygonal area) within an area narrower than first current collector 110. This can further increase the energy density of the battery.

[0450] In the present disclosure, the second rounded portion 240 may be "a portion having a smaller radius than the radius of the corner portion of the second active material layer 220 closest to the second rounded portion 240" (i.e., a portion having a larger curvature than the curvature of the corner portion of the second active material layer 220 closest to the second rounded portion 240).

[0451] 6, the corner of second active material layer 220 (e.g., an active material layer formed in a polygonal shape) that is closest to second rounded portion 240 may be a portion having an angle of 90 degrees or less (e.g., a right angle or an acute angle). In this case, second rounded portion 240 may be a portion that is cut in a curved line.

[0452] 7, the corners of the second active material layer 220 (e.g., an active material layer formed in a polygonal shape) that are closest to each of the second rounded portions (240a, 240b, 240c, 240d) may be portions having an angle of 90 degrees or less (e.g., right angles or acute angles). In this case, each of the second rounded portions (240a, 240b, 240c, 240d) may be a portion that has been cut in a curved shape.

[0453] In the present disclosure, second rounded portion 240 may be "a portion having an angle greater than the angle of the corner of second active material layer 220 that is closest to second rounded portion 240."

[0454] That is, for example, the corner of second active material layer 220 (e.g., an active material layer formed in a polygonal shape) that is closest to second rounded portion 240 may be a portion having an angle of 90 degrees or less (e.g., a right angle or an acute angle).In this case, second rounded portion 240 may be a portion that is cut in a straight line so as to have only angles greater than 90 degrees (e.g., obtuse angles).

[0455] Furthermore, for example, the corners of the second active material layer 220 (e.g., an active material layer formed in a polygonal shape) that are closest to each of the second rounded portions (240a, 240b, 240c, 240d) may be portions having angles of 90 degrees or less (e.g., right angles or acute angles).In this case, each of the second rounded portions (240a, 240b, 240c, 240d) may be portions that are cut in a straight line so as to have only angles greater than 90 degrees (e.g., obtuse angles).

[0456] As described above, by having second rounded portion 240 be "a portion having a smaller radius than the radius of the corner of second active material layer 220 closest to second rounded portion 240" or "a portion having a larger angle than the angle of the corner of second active material layer 220 closest to second rounded portion 240," second active material layer 220 can be arranged in as large an area as possible (for example, a polygonal area) within an area narrower than second current collector 210. This can further increase the energy density of the battery. [Industrial Applicability]

[0457] The battery of the present disclosure can be used, for example, as an all-solid-state lithium secondary battery. [Explanation of symbols]

[0458] 100 1st electrode layer 110 First current collector 120 First active material layer 130 First solid electrolyte layer 140, 140a, 140b, 140c, 140d First rounded part 200 2nd electrode layer 210 Second current collector 220 Second active material layer 230 Second solid electrolyte layer 240, 240a, 240b, 240c, 240d Second rounded part 300 3rd electrode layer 310 Third current collector 320 Third active material layer 330 Third solid electrolyte layer 340 Third rounded part 400 4th electrode layer 410 4th current collector 420 4th active material layer 430 4th solid electrolyte layer 440 Fourth rounded part Batteries 610 First electrode layer forming part 611 First solid electrolyte layer forming section 612 1st electrode side cutting section 613 First active material layer forming section 620 Second electrode layer forming part 621 Second solid electrolyte layer forming section 622 2nd electrode side cutting part 623 Second active material layer forming part 630 Lamination section 640 Press Department 650 control section 6000,6100 Battery manufacturing equipment 710 First electrode layer forming part 720 Second electrode layer forming part 730 Laminated section 740 Press Department 750 control section 760 Cutting section 7000 Battery manufacturing equipment

Claims

1. a first electrode layer; a second electrode layer stacked on the first electrode layer and serving as a counter electrode of the first electrode layer; Equipped with the first electrode layer comprises a first current collector and a first active material layer, the second electrode layer comprises a second current collector and a second active material layer, the first active material layer is in contact with the first current collector and is disposed over an area narrower than the first current collector; a first solid electrolyte layer is disposed in contact with the first current collector and the first active material layer; the first active material layer faces the second electrode layer via the first solid electrolyte layer, the first electrode layer has a polygonal shape having a plurality of corners; At least one of the plurality of corner portions is provided with a first rounded portion, the first active material layer has a polygonal shape having a plurality of corners, a rounded portion is provided at a corner portion of the first active material layer that is adjacent to the first rounded portion, a region where the first current collector and the second current collector overlap in a plan view, and a region where the first current collector and the second current collector do not overlap, the angle of the first rounded portion is larger than the angle of the rounded portion of the first active material layer; battery.

2. the first rounded portion and the rounded portion of the first active material layer are curved rounded portions, The curvature of the first rounded portion is larger than the curvature of the rounded portion of the first active material layer. The battery of claim 1 .

3. the first rounded portion is provided at all of the plurality of corner portions of the first electrode layer; a corner portion of the first active material layer that is adjacent to all of the corner portions of the first electrode layer is provided with a rounded portion; The battery of claim 1 .

4. the second electrode layer includes a second current collector, a second active material layer, and a second solid electrolyte layer; the second active material layer is in contact with the second current collector and is disposed over an area narrower than the second current collector, the second solid electrolyte layer is in contact with the second current collector and the second active material layer and is disposed in the same area as the second current collector; the second active material layer faces the first active material layer with the first solid electrolyte layer and the second solid electrolyte layer interposed therebetween, the first solid electrolyte layer and the second solid electrolyte layer are bonded to each other, the second electrode layer has a polygonal shape having a plurality of corners; At least one of the plurality of corner portions is provided with a second rounded portion, the second active material layer has a polygonal shape having a plurality of corners; a rounded portion is provided at a corner portion of the second active material layer that is adjacent to the second rounded portion; The battery according to any one of claims 1 to 3.

5. the second rounded portion and the rounded portion of the second active material layer are curved rounded portions, The curvature of the second rounded portion is larger than the curvature of the rounded portion of the second active material layer. The battery of claim 4.

6. the angle of the second rounded portion is larger than the angle of the rounded portion of the second active material layer; The battery of claim 4.

7. the second rounded portion is provided at all of the plurality of corner portions of the second electrode layer; a corner portion of the second active material layer that is adjacent to all of the corner portions of the second electrode layer is provided with a rounded portion; The battery of claim 4.

8. the first rounded portion and the second rounded portion have the same shape, the first electrode layer and the second electrode layer are stacked on each other in a state where an end of the first rounded portion and an end of the second rounded portion coincide with each other; The battery according to any one of claims 4 to 7.

9. the first electrode layer and the second electrode layer have the same shape; The first electrode layer and the second electrode layer are stacked on each other in a state where an end of the first electrode layer and an end of the second electrode layer are aligned with each other. The battery of claim 8.

10. the second electrode layer comprises a second current collector and a second active material layer, the second active material layer is in contact with the second current collector and is disposed over an area narrower than the second current collector, the first solid electrolyte layer is in contact with the second current collector and the second active material layer and is disposed in the same area as the second current collector; the second active material layer faces the first active material layer with the first solid electrolyte layer interposed therebetween, the second electrode layer has a polygonal shape having a plurality of corners; At least one of the plurality of corner portions is provided with a second rounded portion, the second active material layer has a polygonal shape having a plurality of corners; a rounded portion is provided at a corner portion of the second active material layer that is adjacent to the second rounded portion, the first rounded portion and the second rounded portion have the same shape, the first electrode layer and the second electrode layer are stacked on each other in a state where an end of the first rounded portion and an end of the second rounded portion coincide with each other; The battery according to any one of claims 1 to 3.

11. the first electrode layer and the second electrode layer have the same shape; The first electrode layer and the second electrode layer are stacked on each other in a state where an end of the first electrode layer and an end of the second electrode layer are aligned with each other. The battery of claim 10.

12. the first electrode layer comprises the first solid electrolyte layer; The battery of claim 1 .

13. the first solid electrolyte layer is disposed in the same area as the first current collector; The battery of claim 1 .

14. the region where the first current collector and the second current collector do not overlap is provided over the entire length of at least one side of the first current collector or the second current collector; The battery of claim 1 .

15. the region where the first current collector and the second current collector do not overlap is provided on two adjacent sides of the first current collector or the second current collector, or on two sides where imaginary lines extending linearly intersect, The battery of claim 1 .

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