All-solid-state batteries

Abstract

To provide an all-solid-state battery that can be manufactured easily while effectively utilizing the internal space of a concave container to increase its capacity. [Solution] The all-solid-state battery has a case having a concave container 11 having a bottom portion 111 and a side wall portion 112, and a lid material covering the opening of the concave container 11, an electrode body 20 containing an electrode layer 21, an electrode layer 22, and an isolation layer 23, and housed in the internal space of the case 11, and a connection terminal 41. A notch 112b is formed on the inner circumferential surface of the side wall portion 112 between the corner portion 112a of the side wall portion 112 and the electrode body 20. The connection terminal 41 that electrically connects the electrode layer 21 and the conductor portion 113 is housed in the notch 112b.

Description

Technical Field

[0001] The present disclosure relates to an all-solid-state battery in which an electrode body is sealed in a case.

Background Art

[0002] Conventionally, various batteries have been disclosed in which an electrode body is housed in an internal space formed by a concave container and a lid material covering the opening of the concave container.

[0003] International Publication No. 2024 / 070787 (Patent Document 1) discloses a battery package that is difficult to discharge to the outside. The battery package includes an insulating substrate having a recess opening upward, a first external electrode and a second external electrode located on the lower surface of the insulating substrate, a first electrode located at the bottom of the recess and electrically connected to the first external electrode, a second electrode located on the insulating substrate and electrically connected to the second external electrode, a conductive elastic member located on the first electrode, and a conductive member that abuts against the upper surface electrode of the battery housed in the recess and electrically connects the upper surface electrode and the second electrode. The elastic member is connected to the first external electrode via a first connection wiring formed inside the side wall of the insulating substrate. The conductive member is connected to the second external electrode via a second connection wiring formed inside the side wall of the insulating substrate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the battery package of Patent Document 1, the first connection wiring and the second connection wiring formed inside the side wall of the insulating substrate are formed in a side wall portion located between a corner portion of the insulating substrate having a rectangular shape in plan view and a recess having a circular shape in plan view. This is because a relatively large horizontal thickness of the side wall can be ensured in the vicinity of the corner portion of the insulating substrate.

[0006] An insulating substrate for a battery package, such as that described in Patent Document 1, is manufactured by firing a laminate of multiple ceramic green sheets at a high temperature. In this case, the first and second connecting wires formed inside the side walls of the insulating substrate are generally formed by metal paste printed and coated onto each ceramic green sheet.

[0007] Thus, the battery package described in Patent Document 1 required the first and second connection wirings to be provided inside the side wall of the insulating substrate.

[0008] The objective of this disclosure is to provide an all-solid-state battery that can be manufactured easily and has a high capacity by effectively utilizing the internal space of a concave container. [Means for solving the problem]

[0009] To solve the above problems, this disclosure is configured as follows. That is, the all-solid-state battery according to this disclosure is an all-solid-state battery comprising a case including a concave container and a first electrode body housed in the internal space of the concave container. The concave container includes a bottom and a side wall portion having corners on its outer surface. The first electrode body includes a first electrode layer disposed on the opening side of the concave container, a second electrode layer disposed on the bottom side, and a first isolation layer disposed between the first electrode layer and the second electrode layer. The side wall portion of the concave container has a first notch formed on the inner circumferential surface of the side wall portion between the first electrode body and the corner of the side wall portion. The first electrode layer is electrically connected to the outside of the concave container via a first connection terminal. The first connection terminal is housed in the first notch. [Effects of the Invention]

[0010] The all-solid-state battery described herein allows for increased battery capacity by effectively utilizing the internal space of a concave container, and can also be easily manufactured. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 is an external perspective view showing the structure of an all-solid-state battery according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the all-solid-state battery shown in Figure 1 (excluding the lid and insulating cushion). [Figure 3] Figure 3 is a plan view of the all-solid-state battery (excluding the lid and insulating cushion) shown in Figure 1. [Figure 4] Figure 4 is a cross-sectional view showing the structure of an all-solid-state battery according to the second embodiment. [Figure 5] Figure 5 is a cross-sectional view showing the structure of an all-solid-state battery according to the third embodiment. [Figure 6] Figure 6 is a cross-sectional view showing the structure of an all-solid-state battery according to the fourth embodiment. [Figure 7] Figure 7 is a cross-sectional view showing the structure of an all-solid-state battery according to the fifth embodiment. [Figure 8] Figure 8 is a plan view showing the structure of an all-solid-state battery according to the sixth embodiment. [Modes for carrying out the invention]

[0012] (Composition 1) An all-solid-state battery according to the embodiment of this disclosure is an all-solid-state battery comprising a case including a concave container and a first electrode body housed in the internal space of the concave container. The concave container includes a bottom and a side wall portion having corners on its outer surface. The first electrode body includes a first electrode layer disposed on the opening side of the concave container, a second electrode layer disposed on the bottom side, and a first isolation layer disposed between the first electrode layer and the second electrode layer. The side wall portion of the concave container has a first notch formed on the inner circumferential surface of the side wall portion between the first electrode body and the corner of the side wall portion. The first electrode layer is electrically connected to the outside of the concave container via a first connection terminal. The first connection terminal is housed in the first notch.

[0013] Thus, by providing the first cut portion on the inner peripheral surface of the side wall portion to accommodate the first connection terminal, the internal space of the concave container can be effectively utilized to increase the capacity of the battery, and the first connection terminal may be arranged in the first cut portion without being embedded in the side wall portion, so that the all-solid-state battery can be easily manufactured.

[0014] (Configuration 2) In the all-solid-state battery of Configuration 1, the first cut portion may extend from the upper end of the side wall portion to the inner surface of the bottom. Thereby, it is possible to facilitate accommodating the first connection terminal in the first cut portion.

[0015] (Configuration 3) In the all-solid-state battery of Configuration 1 or 2, the bottom may have a first conductor portion formed from the inner surface in contact with the first cut portion to the outer surface of the bottom. The first electrode layer may be electrically connected to the outside of the concave container via the first connection terminal and the first conductor portion. Thereby, the first connection terminal accommodated in the first cut portion can be smoothly connected to the first conductor portion.

[0016] (Configuration 4) In any one of the all-solid-state batteries of Configurations 1 to 3, the inner peripheral surface of the side wall portion may have a circular shape in plan view. Thereby, the horizontal thickness at the corner portion of the side wall portion can be increased, and it is easy to secure a space for forming the first cut portion.

[0017] (Configuration 5) In any one of the all-solid-state batteries of Configurations 1 to 4, further, a second electrode body accommodated in the internal space of the concave container may be provided. The second electrode body is disposed between the bottom of the concave container and the first electrode body and may be connected in series with the first electrode body. Thus, even when a plurality of electrode bodies (the first electrode and the second electrode) are connected in series, by providing the first cut portion on the inner peripheral surface of the side wall portion to accommodate the first connection terminal, the internal space of the concave container can be effectively utilized to increase the capacity of the battery, and the first connection terminal may be arranged in the first cut portion without being embedded in the side wall portion, so that the all-solid-state battery can be easily manufactured.

[0018] (Configuration 6) In any one of the all-solid-state batteries of Configurations 1 to 4, a second electrode body housed in the internal space of the concave container may be further provided. The second electrode body may be disposed between the bottom of the concave container and the first electrode body and may be connected in parallel with the first electrode body. The second electrode body may include a third electrode layer disposed on the bottom side and having the same polarity as the first electrode layer, a fourth electrode layer disposed on the first electrode body side and having the same polarity as the second electrode layer, and a second isolation layer disposed between the third electrode layer and the fourth electrode layer. The side wall portion of the concave container may have another corner portion on the outer surface and may have a second cut portion formed on the inner peripheral surface of the side wall portion between the second electrode body and the other corner portion. The second electrode layer of the first electrode body and the fourth electrode layer of the second electrode body may be electrically connected to the outside of the concave container via a second connection terminal. The second connection terminal may be housed in the second cut portion.

[0019] Thus, even when the first electrode body and the second electrode body are connected in parallel, by housing the first connection terminal and the second connection terminal in the respective first cut portion and second cut portion, the internal space of the concave container can be effectively utilized to increase the capacity of the battery, and the first connection terminal and the second connection terminal may be disposed in the first cut portion and the second cut portion without being embedded in the side wall portion, and the all-solid-state battery can be easily manufactured.

[0020] (Configuration 7) In the all-solid-state battery of Configuration 6, the second cut portion may extend from at least the height corresponding to the lower end of the first electrode body of the side wall portion to the inner surface of the bottom. Thereby, the second connection terminal extending from the second electrode layer and the fourth electrode layer can be housed in the second cut portion. Note that the second cut portion may be formed to extend from the upper end of the side wall portion to the inner surface of the bottom. Thereby, it is possible to facilitate housing the second connection terminal in the second cut portion.

[0021] (Configuration 8) In the all-solid-state battery of configuration 6 or 7, the bottom portion may have a second conductive portion formed from the inner surface in contact with the second notch to the outer surface of the bottom portion. The second electrode layer of the first electrode body and the fourth electrode layer of the second electrode body may be electrically connected to the outside of the concave container via the second connecting terminal and the second conductive portion. This allows the second connecting terminal housed in the second notch to be smoothly connected to the second conductive portion.

[0022] (Composition 9) In any one of the all-solid-state batteries according to configurations 1 to 4, a second electrode body may be further provided, housed in the internal space of a concave container. The second electrode body may be housed side by side with the first electrode body, spaced apart in a plan view. The second electrode body may include a third electrode layer located on the opening side of the concave container, a fourth electrode layer located on the bottom side, and a second isolation layer located between the third and fourth electrode layers. The side wall of the concave container may have other corners on its outer surface and a second notch formed on the inner circumferential surface of the side wall between the second electrode body and the other corners of the side wall. The third electrode layer may be electrically connected to the outside of the concave container via a second connection terminal. The second connection terminal may be housed in the second notch.

[0023] Thus, even when multiple electrode bodies (first electrode body and second electrode body) are housed horizontally, by providing notches (first notch and second notch) at the corners of the side walls near each electrode body, the internal space of the concave container can be effectively utilized to increase the capacity of the battery. Furthermore, the first and second connection terminals do not need to be embedded in the side walls but can be placed in the first and second notches, making it easy to manufacture an all-solid-state battery.

[0024] The first to sixth embodiments of this disclosure will be described in detail below with reference to Figures 1 to 8. In the figures, identical and corresponding components are denoted by the same reference numerals, and the same explanation will not be repeated. Also, in order to make the explanation easier to understand, the components in the drawings referred to below are shown in a simplified or schematic form, and some components are omitted.

[0025] (First Embodiment) First, the all-solid-state battery 1 of the first embodiment will be described in detail using Figures 1 to 3.

[0026] As shown in Figures 1 to 3, the all-solid-state battery 1 comprises a case 10 and an electrode body 20 housed in the internal space of the case 10. The all-solid-state battery 1 also comprises an insulating cushion 30 housed in the case 10, connection terminals 41 and 42, and an insulating sheet 60.

[0027] Case 10 comprises a concave container 11 and a lid material 12. The concave container 11 is made of insulating ceramics. As shown in Figure 2, the concave container 11 includes a bottom portion 111 and a side wall portion 112 that is continuously formed from the outer circumference of the bottom portion 111. In a longitudinal cross-sectional view, the side wall portion 112 is provided so as to extend substantially perpendicular to the bottom portion 111.

[0028] The bottom portion 111 has conductive portions 113 and 114 formed inside.

[0029] The side wall portion 112 has a rectangular shape when viewed from above, i.e., from the top of the diagram. Therefore, the side wall portion 112 has corners 112a on its outer surface. The shape of the side wall portion 112 when viewed from above is not particularly limited as long as corners 112a can be formed on its outer surface, and may be a polygon such as a triangular or pentagonal shape. Alternatively, a curved surface may be included on a part of the outer surface of the side wall portion 112 as long as corners 112a can be formed. Furthermore, the corners 112a may be partially cut out or chamfered to prevent damage, as shown in Figure 3. In this embodiment, four corners 112a are formed because the shape of the side wall portion 112 when viewed from above is rectangular.

[0030] The inner circumferential surface of the side wall portion 112 has a cylindrical shape. That is, the inner circumferential surface of the side wall portion 112 may have a circular shape in plan view, as shown in Figure 3. This makes it possible to increase the horizontal thickness at the corner portion 112a of the side wall portion 112, making it easier to form the notched portion 112b described later. However, the plan view shape of the inner circumferential surface of the side wall portion 112 is not particularly limited, and it may be a polygonal or elliptical shape as long as it is possible to form the notched portion 112b.

[0031] The electrode body 20 is housed in the internal space enclosed by the upper surface of the bottom portion 111 and the inner circumferential surface of the side wall portion 112, that is, in the internal space of the concave container 11.

[0032] As shown in Figures 2 and 3, the side wall portion 112 has a notch 112b formed on its inner circumferential surface. The notch 112b is formed between the electrode body 20 housed in the concave container 11 and the corner portion 112a of the side wall portion 112. Therefore, the internal space of the concave container 11 that houses the electrode body 20 and the internal space of the notch 112b are in communication. In this embodiment, two notches 112b are formed. That is, a notch 112b formed between the left corner portion 112a and the electrode body 20, and a notch 112b formed between the right corner portion 112a and the electrode body 20.

[0033] More specifically, the notched portion 112b can be formed such that, in a plan view, it includes a virtual straight line L connecting the geometric center C of the electrode body 20 and the corner portion 112a, as shown in Figure 3. If the corner portion 112a is notched or chamfered as described above, the straight line L can be a straight line connecting the intersection point M of the upper edges on the outer surfaces of the side wall portions 112 located on both sides of the corner portion 112a and the geometric center C of the electrode body 20.

[0034] The notched portion 112b can be formed to extend from the upper end of the side wall portion 112 to the upper surface of the bottom portion 111. In this case, the conductive portion 113 and conductive portion 114 described above can be formed from the inner surface to the outer surface of the bottom portion 111 that is in contact with the notched portion 112b.

[0035] The lid material 12 is a thin plate that covers the opening of the concave container 11. The lid material 12 is, for example, made of metal. The shape and material of the lid material 12 are not particularly limited, as long as it can seal the internal space of the case 10. The lid material 12 may be joined to the concave container (seam welded) by a sealing ring 13 positioned between the lid material 12 and the upper end of the side wall portion 112 of the concave container 11.

[0036] Here, the manufacturing method for the concave container 11 will be described. First, a ceramic green sheet is formed. Next, multiple green sheets are stacked and fired. By stacking multiple green sheets of different shapes, a notch 112b is formed. In addition, a metal paste can be applied to the green sheet forming the bottom 111 to form conductive parts 113 and 114 inside.

[0037] As shown in Figures 2 and 3, the electrode body 20 has a shape that can be accommodated in the internal space of the concave container 11. In this embodiment, the electrode body 20 has a cylindrical shape.

[0038] The electrode body 20 has an electrode layer 21, an electrode layer 22, and an isolation layer 23.

[0039] The electrode layer 21 is positioned on the opening side of the internal space of the concave container 11, that is, on the side of the lid material 12. In this embodiment, the electrode layer 21 is the negative electrode layer.

[0040] The electrode layer 21 is, for example, a negative electrode pellet formed from a negative electrode mixture containing LTO (Li4Ti5O12, lithium titanate), a sulfide-based solid electrolyte, and graphene in a weight ratio of 50:40:10 as the negative electrode active material. The negative electrode active material of the electrode layer 22 is not particularly limited as long as it can function as the negative electrode layer of the electrode body 20, and may be, for example, metallic lithium, lithium alloy, carbon materials such as graphite and low-crystallinity carbon, or oxides such as SiO, or a mixture of these as appropriate. Other components and their proportions are also not particularly limited.

[0041] The electrode layer 22 is positioned on the bottom 111 side of the concave container 11. In this embodiment, the electrode layer 22 is a positive electrode layer.

[0042] The electrode layer 22 is a positive electrode pellet formed from a positive electrode mixture containing lithium cobalt oxide, a sulfide-based solid electrolyte, and graphene as a conductive additive in a mass ratio of 65:30:5 as the positive electrode active material. The positive electrode active material of the electrode layer 22 is not particularly limited as long as it can function as the positive electrode layer of the electrode body 20, and may be, for example, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt manganese composite oxide, olivine-type composite oxide, etc., or a mixture of these as appropriate. Other components and their proportions are also not particularly limited.

[0043] The isolation layer 23 is placed between the electrode layer 21 and the electrode layer 22. In this embodiment, the isolation layer 23 is a solid electrolyte layer.

[0044] The isolation layer 23 contains a sulfide-based solid electrolyte. While the solid electrolytes contained in the electrode layer 21, electrode layer 22, and isolation layer 23 are not particularly limited, a sulfide-based solid electrolyte, particularly an argyrodite-type sulfide-based solid electrolyte, is preferred from the viewpoint of ionic conductivity. When using a sulfide-based solid electrolyte, it is preferable to coat the surface of the positive electrode active material with a lithium-ion conductive material such as niobium oxide to prevent reaction with the positive electrode active material. Furthermore, the solid electrolytes contained in the isolation layer 23, electrode layer 21, and electrode layer 22 may be hydride-based solid electrolytes, oxide-based solid electrolytes, etc. The size and shape of the isolation layer 23 are not particularly limited.

[0045] As shown in Figure 1, the insulating cushion 30 is placed between the electrode body 20 and the lid material 12. With the insulating cushion 30 housed inside the case 10, it presses the electrode body 20 toward the bottom 111 of the concave container 11, thereby fixing the electrode body 20 in place.

[0046] As shown in Figure 2 (see also Figures 1 and 3), the connection terminal 41 connects the electrode layer 21 of the electrode body 20 to the conductor portion 113. One end of the connection terminal 41 contacts the electrode layer 21, and the other end contacts the conductor portion 113 by bending along the lower end of the notch 112b. The other end of the electrode layer 21 may be welded to the conductor portion 113. The connection terminal 41 is housed in the notch 112b on the left side of the figure. In this way, the electrode layer 21 is electrically connected to the outside (external terminal 51) via the connection terminal 41 and the conductor portion 113. In this embodiment, the external terminal 51 functions as the negative electrode terminal.

[0047] As shown in Figure 2, the connection terminal 42 connects the electrode layer 22 of the electrode body 20 to the conductor portion 114. The connection terminal 42 is housed at the lower end of the notch portion 112b on the right side of the figure. In this way, the electrode layer 22 is electrically connected to the outside (external terminal 52) via the connection terminal 42 and the conductor portion 114. In this embodiment, the external terminal 52 functions as the positive electrode terminal.

[0048] The insulating sheet 60 may be placed between the side surface of the electrode body 20 and the connection terminal 41. The insulating sheet 60 suppresses short circuits caused by contact between the electrode layer 22 of the electrode body 20 and the connection terminal 41.

[0049] By providing a notch 112b on the inner circumferential surface of the side wall portion 112 and arranging the connection terminals 41 and 42 therein, the internal space of the concave container 11 can be effectively utilized to increase the capacity of the battery. Furthermore, since only the connection terminals 41 or 42 need to be placed in the notch 112b, the all-solid-state battery 1 can be easily manufactured.

[0050] Furthermore, by forming the notch 112b to extend from the upper end of the side wall 112 to the inner surface of the bottom 111, it becomes easier to accommodate the connection terminal 41 or the connection terminal 42 in the notch 112b. That is, a part of the connection terminal 41 that extends from a height corresponding to the upper end of the electrode layer 21 to the inner surface of the bottom 111, and a part of the connection terminal 41 that is bent and extends along the inner surface of the bottom 111, as well as the connection terminal 42, become easier to accommodate in the notches 112b, 112b. In this disclosure, height refers to the vertical length shown in Figures 1, 2 and 4 to 7.

[0051] Furthermore, by forming the conductor portion 113 and the conductor portion 114 from the inner surface of the bottom portion 111 that is in contact with the respective notches 112b, 112b where the connection terminals 41 and 42 are housed, the connection terminals 41 and 42 housed in the notches 112b, 112b can be smoothly connected to the conductor portion 113 and the conductor portion 114.

[0052] Although not specifically shown in the diagram, current collectors can be provided on the upper surface of the electrode layer 21 on the side of the cover material 12 and on the lower surface of the electrode layer 22 on the side of the bottom 111.

[0053] (Second Embodiment) Next, the all-solid-state battery 1 of the second embodiment will be described in detail using Figure 4. Here, we will only describe the configuration that is fundamentally different from the all-solid-state battery 1 of the first embodiment.

[0054] The all-solid-state battery 1 of the second embodiment further comprises an electrode body 70.

[0055] The electrode body 70 is positioned between the electrode body 20 and the bottom 111 in the internal space of the concave container 11. The electrode body 70 includes an electrode layer 71 positioned between the electrode layer 22 of the electrode body 20 and the bottom 111, an electrode layer 72 positioned between the electrode layer 71 and the bottom 111, and an isolation layer 73 positioned between the electrode layer 71 and the electrode layer 72. The details of each of the electrode layer 71, electrode layer 72, and isolation layer 73 are the same as those of the electrode layer 21, electrode layer 22, and isolation layer 73, and therefore will not be described.

[0056] Electrode layer 71 is the negative electrode layer, electrode layer 72 is the positive electrode layer, and isolation layer 73 is the solid electrolyte layer. Therefore, electrode body 20 and electrode body 70 are connected in series. A current collector 80 may be placed between electrode body 20 and electrode body 70.

[0057] The connection terminal 41 contacts the electrode layer 21 of the electrode body 20, extends to the inner surface of the bottom portion 111, and contacts the conductor portion 113.

[0058] The connection terminal 42 is in contact with the electrode layer 72 of the electrode body 70 and is in contact with the conductor portion 114.

[0059] The insulating sheet 60 is placed between the electrode body 70 and the connection terminal 41, and between the current collector 80 and the connection terminal 41.

[0060] Thus, the present disclosure allows for the same effects as the all-solid-state battery 1 of the first embodiment to be obtained even in an all-solid-state battery 1 in which electrode bodies 20 and 70 are connected in series. In this embodiment, two electrode bodies, electrode body 20 and electrode body 70, are housed in the internal space of the concave container 11, but three or more electrode bodies may be housed in series.

[0061] (Third embodiment) Next, the all-solid-state battery 1 of the third embodiment will be described in detail using Figure 5. Here, we will only describe the configuration that is fundamentally different from the all-solid-state battery 1 of the second embodiment.

[0062] In the third embodiment, the all-solid-state battery 1 does not have a notch 112b for accommodating the connection terminal 42. That is, only a notch 112b for accommodating the connection terminal 41 is formed.

[0063] The connection terminal 42 is positioned between the electrode layer 72 and the bottom portion 111 of the electrode body 70 and is in contact with the conductor portion 114.

[0064] Thus, when connecting the connection terminal 42 to the electrode layer 72 facing the bottom portion 111, it is not necessary to provide a notch 112b to accommodate the connection terminal 42. This is also true for the connection terminal 42 in the first embodiment (see Figure 2).

[0065] (Fourth Embodiment) Next, the all-solid-state battery 1 of the fourth embodiment will be described in detail using Figure 6. Here, we will only describe the configuration that is fundamentally different from the all-solid-state battery 1 of the first embodiment.

[0066] The all-solid-state battery 1 of the fourth embodiment further comprises an electrode body 70.

[0067] The electrode body 70 is positioned between the electrode body 20 and the bottom 111 in the internal space of the concave container 11. The electrode body 70 includes an electrode layer 72 positioned between the electrode layer 22 of the electrode body 20 and the bottom 111, an electrode layer 71 positioned between the electrode layer 72 and the bottom 111, and an isolation layer 73 positioned between the electrode layer 72 and the electrode layer 71. The details of each of the electrode layer 71, electrode layer 72, and isolation layer 73 are the same as those of the electrode layer 21, electrode layer 22, and isolation layer 23, and therefore will not be described.

[0068] Electrode layer 71 is the negative electrode layer, electrode layer 72 is the positive electrode layer, and isolation layer 73 is the solid electrolyte layer. In the all-solid-state battery 1 of the fourth embodiment, the electrode body 70 is inverted, unlike the electrode body 70 of the second embodiment. That is, electrode layers 22 and 72, which have the same polarity (positive electrode), are arranged facing each other. Also, electrode layers 21 and 71, which have the same polarity (negative electrode), are located on the lid material 12 side of electrode body 20 and on the bottom 111 side of electrode body 70, respectively.

[0069] The connector terminal 41 is in contact with the electrode layer 21 and the electrode layer 71, and also in contact with the conductor portion 113. The connector terminal 41 is housed in the notch portion 112b on the left side of the figure.

[0070] The connecting terminal 42 is located between the electrode layer 22 and the electrode layer 72, in contact with the electrode layer 22 and the electrode layer 72, and also in contact with the conductor portion 114. The connecting terminal 42 is housed in the notch portion 112b on the right side of the figure. Therefore, the electrode body 20 and the electrode body 70 are connected in parallel.

[0071] The all-solid-state battery 1 of this disclosure can achieve the same effects as the first embodiment even when the electrode body 20 and electrode body 70 are connected in parallel. Furthermore, when the electrode body 20 and electrode body 70 are connected in parallel, it is necessary to house not only the connection terminal 41 but also the connection terminal 42 extending from between the electrode body 20 and electrode body 70 in the notch 112b. For this reason, the all-solid-state battery of this disclosure can be suitably used in particular when the electrode body 20 and electrode body 70 are connected in parallel. That is, by housing the connection terminal 41 and the connection terminal 42 in the notches 112b, 112b respectively, the internal space of the concave container 11 can be effectively utilized to increase the capacity of the battery. In addition, the all-solid-state battery 1 can be easily manufactured by simply arranging the connection terminal 41 and the connection terminal 42 in the notches 112b, 112b.

[0072] Furthermore, the notch 112b on the right side of the figure, which accommodates the connection terminal 42, does not need to be formed to extend from the upper end of the side wall 112 to the inner surface of the bottom 111 as shown in the figure. It may be formed to extend from a height corresponding to at least the lower end of the electrode body 20 to the inner surface of the bottom 111 in order to accommodate the connection terminal 42. Also, in the all-solid-state battery 1 of the first and second embodiments (see Figures 2 and 4), the height of the notch 112b that accommodates the connection terminal 42 from the inner surface of the bottom 111 can be set to a height that can accommodate the connection terminal 42. For example, the height of the notch 112b from the inner surface of the bottom 111 may be slightly greater than the height of the connection terminal 42.

[0073] (Fifth embodiment) Next, the all-solid-state battery 1 of the fifth embodiment will be described in detail using Figure 7. Here, we will only describe the configuration that is fundamentally different from the all-solid-state battery 1 of the fourth embodiment.

[0074] In the all-solid-state battery 1 of the fifth embodiment, the electrode body 20 and the electrode body 70 each include a porous metal layer 24 and a porous metal layer 74.

[0075] The porous metal layer 24 is located on one or both of the upper and lower end faces of the electrode body 20. That is, the porous metal layer 24 may be located on the side of the electrode layer 21 opposite to the isolation layer 23. The porous metal layer 24 may be located on the side of the electrode layer 22 opposite to the isolation layer 23.

[0076] The porous metal layer 74 is located on one or both of the upper and lower end faces of the electrode body 70. That is, the porous metal layer 74 may be located on the side of the electrode layer 71 opposite to the isolation layer 73. The porous metal layer 74 may be located on the side of the electrode layer 72 opposite to the isolation layer 73.

[0077] The porous metal layers 24 and 74 are porous metal substrates with a high porosity, similar to a foamed porous metal body, and have voids that penetrate from one surface to the other. They can be compressed by pressing and function as current collectors. The porous metal layers 24 and 74 cover the surfaces of the electrode layers 21, 22, 71, or 72. To reduce electrical resistance, it is preferable that the porous metal layers 24 and 74 not only contact the electrode layers 21, 22, 71, or 72, but also that a portion of them is embedded in the surface layer of the negative electrode mixture or positive electrode mixture of the electrode layers 21, 22, 71, or 72, thereby integrating them with the electrode layers 21, 22, 71, or 72.

[0078] The porosity of the porous metal layers 24 and 74 is preferably 80% or more, and more preferably 90% or more, in order to facilitate adjustment of variations in the thickness of the electrode body 20 or 70 due to compression. On the other hand, in order to ensure good conductivity, the porosity of the porous metal layers 24 and 74 is preferably 99% or less. The thickness of the porous metal layers 24 and 74 before assembling the all-solid-state battery 1 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and particularly preferably 0.5 mm or more, while it is preferably 3 mm or less, more preferably 2 mm or less, and particularly preferably 1.5 mm or less.

[0079] By providing the porous metal layers 24 and 74 in this manner, variations in the thickness of the electrode body 20 or electrode body 70 or the height of the case 10 can be sufficiently absorbed, and as a result, variations in the internal resistance value can be suppressed.

[0080] Furthermore, the porous metal layers 24 and 74 can also be applied to the electrode body 20 or electrode body 70 of the first to fourth embodiments and the sixth embodiment described later.

[0081] (Sixth Embodiment) Next, the all-solid-state battery 1 of the sixth embodiment will be described in detail using Figure 8. Here, we will only describe the configuration that is fundamentally different from the all-solid-state battery 1 of the first embodiment.

[0082] The all-solid-state battery 1 of the sixth embodiment further comprises an electrode body 70.

[0083] In a plan view, the electrode body 70 is housed in the internal space of the concave container 11, arranged so as to be spaced apart from the electrode body 20. Although not specifically shown in the figures, the electrode body 70, like the electrode body 20 of the first embodiment, includes an electrode layer 71 positioned on the lid material 12 side, an electrode layer 72 positioned on the bottom 111 side, and an isolation layer 73 positioned between the electrode layer 71 and the electrode layer 72.

[0084] In this embodiment, electrode layer 71 is a negative electrode layer, electrode layer 72 is a positive electrode layer, and isolation layer 73 is a solid electrolyte layer.

[0085] Similar to the all-solid-state battery 1 of the first embodiment (see Figure 2), the electrode layer 71 is electrically connected to the conductor portion 113 via connection terminals 41. The electrode layer 72 is electrically connected to the conductor portion 113 via connection terminals 42. The connection terminals 41 and 42 may each be housed in notches 112b, 112b formed near different corner portions 112a.

[0086] Thus, even in an all-solid-state battery 1 having electrode bodies 20 and 70 arranged horizontally, the same effects as the all-solid-state battery 1 of the first embodiment can be obtained. In addition, in each of the electrode bodies 20 and 70 of this embodiment, multiple electrode bodies can be connected in series or parallel, as in the all-solid-state batteries 1 of the second to fourth embodiments.

[0087] In the first to sixth embodiments described above, electrode layers 21 and 71 function as negative electrode layers and electrode layers 22 and 72 function as positive electrode layers. However, electrode layers 21 and 71 may function as positive electrode layers and electrode layers 22 and 72 may function as negative electrode layers. In this case, external terminal 52 functions as the negative electrode terminal and external terminal 51 functions as the positive electrode terminal.

[0088] Furthermore, according to the present invention, it is possible to contribute to Goal 7, "Ensure access to affordable, reliable, sustainable, and modern energy for all," and Goal 12, "Ensure sustainable consumption and production patterns," of the United Nations' Sustainable Development Goals (SDGs).

[0089] Although embodiments have been described above, this disclosure is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the disclosure. [Explanation of Symbols]

[0090] 1 All-solid-state battery, 10 Case, 11 Concave container, 12 Lid material, 13 Seal ring, 111 Bottom, 112 Side wall, 112a Corner, 112b Notch, 113 Conductor part, 114 Conductor part, 20 Electrode body, 70 Electrode body

Claims

1. A solid-state battery comprising a case including a concave container and a first electrode body housed in the internal space of the concave container, The aforementioned concave container includes a bottom and a side wall portion having corners on its outer surface. The first electrode body includes a first electrode layer disposed on the opening side of the concave container, a second electrode layer disposed on the bottom side, and a first isolation layer disposed between the first electrode layer and the second electrode layer. The side wall portion of the concave container has a first notch formed on the inner circumferential surface of the side wall portion between the first electrode body and the corner portion of the side wall portion, The first electrode layer is electrically connected to the outside of the concave container via the first connection terminal. The first connection terminal is housed in the first notch, and is a solid-state battery.

2. The all-solid-state battery according to claim 1, The first notch extends from the upper end of the side wall to the inner surface of the bottom, in this all-solid-state battery.

3. The all-solid-state battery according to claim 2, The bottom portion has a first conductive portion formed from the inner surface in contact with the first notch to the outer surface of the bottom portion, A solid-state battery in which the first electrode layer is electrically connected to the outside of the concave container via the first connection terminal and the first conductor portion.

4. The all-solid-state battery according to claim 1, The inner circumferential surface of the side wall portion has a circular shape in plan view, in this all-solid-state battery.

5. The all-solid-state battery according to claim 1, Furthermore, the device comprises a second electrode body housed in the internal space of the concave container, A solid-state battery in which the second electrode body is positioned between the bottom of the concave container and the first electrode body and connected in series with the first electrode body.

6. The all-solid-state battery according to claim 1, Furthermore, the device comprises a second electrode body housed in the internal space of the concave container, The second electrode body is disposed between the bottom of the concave container and the first electrode body and connected in parallel with the first electrode body, and includes a third electrode layer disposed on the bottom side and having the same polarity as the first electrode layer, a fourth electrode layer disposed on the first electrode body side and having the same polarity as the second electrode layer, and a second isolation layer disposed between the third electrode layer and the fourth electrode layer. The side wall portion of the concave container has another corner on its outer surface, and has a second notch formed on the inner circumferential surface of the side wall portion between the second electrode body and the other corner. The second electrode layer of the first electrode body and the fourth electrode layer of the second electrode body are electrically connected to the outside of the concave container via a second connection terminal. The second connection terminal is housed in the second notch, and the battery is solid-state.

7. The all-solid-state battery according to claim 6, The all-solid-state battery wherein the second notch extends from a height corresponding to at least the lower end of the first electrode body in the side wall to the inner surface of the bottom.

8. The all-solid-state battery according to claim 7, The bottom portion has a second conductive portion formed from the inner surface in contact with the second notch to the outer surface of the bottom portion, A solid-state battery in which the second electrode layer of the first electrode body and the fourth electrode layer of the second electrode body are electrically connected to the outside of the concave container via the second connection terminal and the second conductor portion.

9. The all-solid-state battery according to claim 1, Furthermore, the device comprises a second electrode body housed in the internal space of the concave container, The second electrode body is housed in a plan view, spaced apart from the first electrode body, and includes a third electrode layer positioned on the opening side of the concave container, a fourth electrode layer positioned on the bottom side, and a second isolation layer positioned between the third electrode layer and the fourth electrode layer. The side wall portion of the concave container has other corners on its outer surface, and has a second notch formed on the inner circumferential surface of the side wall portion between the second electrode body and the other corners of the side wall portion. The third electrode layer is electrically connected to the outside of the concave container via the second connection terminal. The second connection terminal is housed in the second notch, and the battery is solid-state.

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