JP7380860B2 - All-solid-state batteries and assembled batteries - Google Patents

Description

The present invention relates to an all-solid-state battery and a battery assembly in which a plurality of all-solid-state batteries are connected.

All-solid-state batteries are known that include a solid electrolyte instead of an electrolyte. Furthermore, assembled batteries configured by connecting a plurality of all-solid-state batteries are also known.

Patent Document 1 describes an all-solid-state battery having a configuration in which a positive terminal and a negative terminal functioning as external electrodes are provided on an upper surface and a lower surface, respectively. Specifically, a power generation element in which a positive electrode, a solid electrolyte, and a negative electrode are laminated is sandwiched between insulating substrates, contact holes and through holes are provided in the insulating substrate, and the positive electrode is electrically connected to the positive terminal. The negative electrode is electrically connected to the negative electrode terminal. According to this all-solid-state battery, it is described in Patent Document 1 that parallel connection is easily possible by simply stacking a plurality of batteries vertically.

Japanese Patent Application Publication No. 2003-168416

However, the all-solid-state battery described in Patent Document 1 requires an insulating substrate, and furthermore, it is necessary to provide contact holes and through holes in the insulating substrate, resulting in a complicated structure and high manufacturing costs. .

The present invention solves the above problems, and provides an all-solid-state battery that does not require contact holes or through-holes and can be easily connected to other all-solid-state batteries, and a system for connecting multiple such all-solid-state batteries. The purpose is to provide an assembled battery that

The all-solid-state battery of the present invention is
a positive electrode having a first main surface, a second main surface, a first side surface, a second side surface, a first end surface, and a second end surface and drawn out to the first end surface; a laminate including a negative electrode drawn out to a second end surface, and a solid electrolyte layer disposed between the positive electrode and the negative electrode;
formed on at least the first end surface of the laminate, and a first surface that is one of the first main surface and the first side surface, and electrically connected to the positive electrode. a first external electrode;
a second external electrode formed on at least the second end surface of the laminate and a second surface opposite to the first surface, and electrically connected to the negative electrode;
Equipped with
The dimension of the first external electrode formed on the first surface in the length direction where the first end surface and the second end surface face each other is the dimension of the laminate in the length direction. longer than 1/2 of
The dimension in the length direction of the second external electrode formed on the second surface is longer than 1/2 of the dimension in the length direction of the laminate;
A region of the first surface on the first end surface side where the first external electrode is formed, and a region of the second surface where the second external electrode is formed. At least one of the regions on the second end surface side is covered with an insulator.

According to the all-solid-state battery of the present invention, the all-solid-state battery is All-solid-state batteries can be easily connected in series by simply bringing them into contact with each other. The first external electrode is electrically connected to the positive electrode drawn out to the first end surface, and the second external electrode is electrically connected to the negative electrode drawn out to the second end surface. , there is no need to provide contact holes or through holes for connecting between electrodes.

(a) is a schematic top view when looking at the first main surface of the all-solid-state battery in the first embodiment, (b) is a schematic bottom view when looking at the second main surface, (c) is a schematic side view of the first side surface, (d) is a schematic side view of the second side surface, (e) is a schematic end view of the first end surface side, (f ) is a schematic end view of the second end surface side. FIG. 2 is a cross-sectional view of a laminate that constitutes an all-solid-state battery. FIG. 2 is a diagram schematically showing a side view of an assembled battery configured by stacking two all-solid-state batteries connected in series in the first embodiment. FIG. 2 is a diagram schematically showing a side view of an assembled battery configured by stacking three all-solid-state batteries and connecting them in series in the first embodiment. FIG. 2 is a diagram schematically showing a side view of an assembled battery configured by stacking four all-solid-state batteries connected in series in the first embodiment. (a) to (f) are diagrams for explaining a method of forming a first external electrode and a second external electrode on the surface of a laminate. (a) is a schematic top view when looking at the first main surface of the all-solid-state battery in the second embodiment, (b) is a schematic bottom view when looking at the second main surface, (c) is a schematic side view of the first side surface, (d) is a schematic side view of the second side surface, (e) is a schematic end view of the first end surface side, (f ) is a schematic end view of the second end surface side. (a) is a diagram schematically showing a side view of an assembled battery configured by connecting two all-solid-state batteries in series in the second embodiment, and (b) is a diagram schematically showing a side view of an assembled battery configured by connecting two all-solid-state batteries in series. It is a figure which shows typically the side surface of the assembled battery which is comprised, (c) is a figure which shows typically the side surface of the assembled battery which is constructed by connecting four in series. (a) is a schematic top view when looking at the first main surface of the all-solid-state battery in the third embodiment, (b) is a schematic bottom view when looking at the second main surface, (c) is a schematic side view of the first side surface, (d) is a schematic side view of the second side surface, (e) is a schematic end view of the first end surface side, (f ) is a schematic end view of the second end surface side. (a) is a top view schematically showing an assembled battery 200 configured by connecting two all-solid-state batteries in series in a third embodiment, and (b) is a top view schematically showing an assembled battery 200 configured by connecting three all-solid-state batteries in series. FIG. 2 is a top view schematically showing the assembled battery. (a) is a schematic top view when looking at the first main surface of the all-solid-state battery in the fourth embodiment, (b) is a schematic bottom view when looking at the second main surface, (c) is a schematic side view of the first side surface, (d) is a schematic side view of the second side surface, (e) is a schematic end view of the first end surface side, (f ) is a schematic end view of the second end surface side. (a) is a side view schematically showing an assembled battery configured by stacking two all-solid-state batteries in a fourth embodiment and connecting them in series, and (b) is a side view schematically showing an assembled battery configured by stacking three all-solid-state batteries. FIG. 2 is a side view schematically showing an assembled battery configured by being connected in series. (a) is a schematic top view when looking at the first main surface of the all-solid-state battery in the fifth embodiment, (b) is a schematic bottom view when looking at the second main surface, (c) is a schematic side view of the first side surface, (d) is a schematic side view of the second side surface, (e) is a schematic end view of the first end surface side, (f ) is a schematic end view of the second end surface side. (a) is a side view schematically showing an assembled battery constructed by stacking two all-solid-state batteries in a fifth embodiment and connecting them in series, and (b) is a side view schematically showing a battery assembly configured by stacking two all-solid-state batteries and connecting them in series. FIG. 2 is a side view schematically showing an assembled battery configured by being connected in series.

Embodiments of the present invention will be shown below, and features of the present invention will be specifically explained.

<First embodiment>
FIG. 1(a) is a schematic top view when looking at the first main surface of the all-solid-state battery 100 in the first embodiment, and FIG. 1(b) is a schematic top view when looking at the second main surface. A schematic bottom view, FIG. 1(c) is a schematic side view of the first side, FIG. 1(d) is a schematic side view of the second side, and FIG. 1(e) is a schematic side view of the first side. FIG. 1(f) is a schematic end view of the second end surface. Further, FIG. 2 is a cross-sectional view of the laminate 10 that constitutes the all-solid-state battery 100.

As shown in FIGS. 1 and 2, the all-solid-state battery 100 has a rectangular parallelepiped shape as a whole, and includes a laminate 10, a first external electrode 21, a second external electrode 22, and an insulator. 30. The rated voltage of an all-solid-state battery is, for example, 2V.

The laminate 10 has a first end face 15a and a second end face 15b facing each other, a first main face 16a and a second main face 16b facing each other, and a first side face 17a and a second side face 17a facing each other. side surface 17b. Here, the direction in which the first end surface 15a and the second end surface 15b face each other is referred to as the length direction L, the direction in which the first main surface 16a and the second main surface 16b oppose each other is referred to as the stacking direction T, and the first side surface The direction in which the first side surface 17a and the second side surface 17b face each other is defined as a width direction W. Any two directions among the length direction L, the stacking direction T, and the width direction W are directions orthogonal to each other.

As shown in FIG. 2, the laminate 10 includes a positive electrode 1, a negative electrode 2, and a solid electrolyte layer 3. More specifically, the laminate 10 has a structure in which a plurality of positive electrodes 1 and negative electrodes 2 are alternately stacked in the stacking direction T with solid electrolyte layers 3 interposed therebetween.

In this embodiment, the positive electrode 1 has a positive electrode active material layer containing a positive electrode active material and a positive electrode current collector. Examples of the positive electrode active material include a lithium-containing phosphoric acid compound having a Nasicon-type structure, a lithium-containing phosphoric acid compound having an olivine-type structure, a lithium-containing layered oxide, a lithium-containing oxide having a spinel-type structure, and the like. The positive electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.

The positive electrode 1 is drawn out to the first end surface 15a, but not drawn out to the second end surface 15b, the first side surface 17a, and the second side surface 17b.

In this embodiment, the negative electrode 2 has a negative electrode active material layer containing a negative electrode active material and a negative electrode current collector. As the negative electrode active material, for example, MO _x (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, and Mo, and x is 0.9≦x≦2. 0), graphite-lithium compounds, lithium alloys, lithium-containing phosphoric acid compounds with a Nasicon-type structure, lithium-containing phosphoric acid compounds with an olivine-type structure, lithium-containing oxides with a spinel-type structure Examples include things. The negative electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.

The negative electrode 2 is drawn out to the second end surface 15b, but not drawn out to the first end surface 15a, the first side surface 17a, and the second side surface 17b.

Examples of the solid electrolyte included in the solid electrolyte layer 3 include a lithium-containing phosphoric acid compound having a Nasicon structure, an oxide solid electrolyte having a perovskite structure, and an oxide solid electrolyte having a garnet type or garnet type similar structure. .

Note that the all-solid-state battery 100 according to the present invention is characterized by the shape and arrangement position of a first external electrode 21, a second external electrode 22, and an insulator 30, which will be described later. That is, the structure of the laminate 10 including the positive electrode 1, the negative electrode 2, and the solid electrolyte layer 3 is not limited to the above-described structure.

The first external electrode 21 is formed on at least the first end surface 15a of the laminate 10 and the first surface that is one of the first main surface 16a and the first side surface 17a. . In this embodiment, the first surface is the first main surface 16a, and the first external electrode 21 covers the entire first end surface 15a, a part of the first main surface 16a, and the first side surface. 17a and a portion of the second side surface 17b. Note that, as described later, a portion of the first external electrode 21 is covered with an insulator 30. That is, in FIG. 1, the visible region of the first external electrode 21 is hatched. Note that the portion of the first external electrode 21 that is formed across the surface is connected without interruption.

The first external electrode 21 is connected to the positive electrode 1 drawn out to the first end surface 15a at the first end surface 15a, so that the first external electrode 21 and the positive electrode 1 are electrically connected to each other. It is connected.

As shown in FIG. 1(a), the dimension in the length direction L of the first external electrode 21 formed on the first main surface 16a is 1/2 of the dimension in the length direction L of the laminate 10. longer. Note that in FIGS. 1(a) to 1(d), the dashed-dotted line is a line indicating the position of 1/2 of the dimension in the length direction L of the laminate 10.

The first external electrode 21 formed on the first side surface 17a and the second side surface 17b has a triangular shape.

The second external electrode 22 is formed at least on the second end surface 15b of the laminate 10 and on the second surface facing the first surface. In this embodiment, the second surface is the second main surface 16b, and the second external electrode 22 covers the entire second end surface 15b, a part of the second main surface 16b, and the first side surface. 17a and a portion of the second side surface 17b. In FIG. 1, the visible region of the second external electrode 22 is hatched. Note that the portion of the second external electrode 22 that is formed across the surface is connected without interruption.

The second external electrode 22 is connected to the negative electrode 2 drawn out to the second end surface 15b at the second end surface 15b, so that the second external electrode 22 and the negative electrode 2 are electrically connected to each other. It is connected.

Note that the first external electrode 21 and the second external electrode 22 may not be formed on the first side surface 17a and the second side surface 17b of the stacked body 10.

As shown in FIG. 1(b), the dimension in the length direction L of the second external electrode 22 formed on the second main surface 16b is 1/2 of the dimension in the length direction L of the laminate 10. longer.

The second external electrode 22 formed on the first side surface 17a and the second side surface 17b has a substantially triangular shape. As shown in FIG. 1(c) and FIG. 1(d), the first external electrode 21 and the second external electrode 22 formed on the first side surface 17a and the second side surface 17b are in contact with each other. It is designed so that it does not.

A region on the first end surface 15a side of the first main surface 16a, where the first external electrode 21 is formed, and a region on the first end surface 15a side, where the second external electrode 22 is formed. At least one region of the second main surface 16b, which is the second surface, on the second end surface 15b side is covered with the insulator 30. The insulator 30 may be made of any electrically insulating material, such as a polymeric material or a glass material. As the polymer material, for example, a fluorine-based material can be used. Further, as the glass material, for example, an epoxy material can be used.

In this embodiment, a region of the first main surface 16a on the first end surface 15a side is covered with the insulator 30. The dotted area in FIG. 1 is the area covered by the insulator 30. More specifically, as shown in FIGS. 1A to 1E, the entire first end surface 15a, a predetermined area on the first end surface 15a side of the first main surface 16a, and the second main surface 16b on the second end surface 15b side, a predetermined region on the first end surface 15a side of the first side surface 17a, and a predetermined region on the first end surface 15a side of the second side surface 17b. The area is covered by an insulator 30.

A predetermined area on the first end surface 15a side of the first main surface 16a is a part of the first outer surface when another all-solid-state battery to be connected in series is stacked on the first main surface 16a. The width is determined so that the electrode 21 and the first external electrode of another stacked all-solid-state battery do not come into contact with each other.

FIG. 3 is a diagram schematically showing a side view of a battery pack 200 configured by stacking two all-solid-state batteries 100a and 100b and connecting them in series. The configuration of the all-solid-state battery 100a is the same as the configuration of the all-solid-state battery 100 shown in FIG. On the other hand, the all-solid-state battery 100b differs from the all-solid-state battery 100 shown in FIG. 1 in the position where the insulator 30 is formed. That is, in the all-solid-state battery 100b, a region of the second main surface 16b on the second end surface 15b side is covered with the insulator 30. More specifically, the entire second end surface 15b, a predetermined region of the second main surface 16b on the second end surface 15b side, a predetermined region of the first main surface 16a on the second end surface 15b side, A predetermined region of the first side surface 17a on the second end surface 15b side and a predetermined region of the second side surface 17b on the second end surface 15b side are covered with the insulator 30. The two all-solid-state batteries 100a and 100b are stacked such that the first main surface 16a of the all-solid-state battery 100a and the second main surface 16b of the all-solid-state battery 100b face each other.

As described above, the dimension in the length direction L of the first external electrode 21 formed on the first main surface 16a, which is the first surface, is 1/1/2 of the dimension in the length direction L of the laminate 10. The dimension in the length direction L of the second external electrode 22 formed on the second main surface 16b, which is the second surface, is 1/2 of the dimension in the length direction L of the laminate 10. longer. Therefore, as shown in FIG. 3, the first external electrode 21 formed on the first main surface 16a of the all-solid-state battery 100a is formed on the second main surface 16b of the all-solid-state battery 100b. The second external electrode 22 is in contact with the second external electrode 22, thereby electrically connected to each other. The first external electrode 21 of the all-solid-state battery 100a is not in contact with the first external electrode 21 of the all-solid-state battery 100b, and is electrically insulated. Further, the second external electrode 22 of the all-solid-state battery 100a is not in contact with the second external electrode 22 of the all-solid-state battery 100b, and is electrically insulated.

In this way, the two all-solid-state batteries 100a and 100b can be easily connected in series by simply bringing them into contact with each other. Further, the first surface on which the first external electrode 21 is formed is the first main surface 16a, and the second surface on which the second external electrode 22 is formed is the second main surface 16b. As a result, the assembled battery 200 is constructed by stacking the two all-solid-state batteries 100a and 100b in the stacking direction T, so the mounting area of the assembled battery 200 is the same as that of one all-solid-state battery, resulting in space saving. can be realized.

Note that the two all-solid-state batteries 100a and 100b may be connected using a bonding material such as conductive paste or solder. By using the bonding material to connect, the all-solid-state battery 100a and the all-solid-state battery 100b can be more reliably connected.

FIG. 4 is a diagram schematically showing a side view of a battery pack 300 configured by stacking three all-solid-state batteries 100a, 100b, and 100c and connecting them in series. The configurations of all-solid-state batteries 100a and 100c are the same as the configuration of all-solid-state battery 100 shown in FIG. On the other hand, the configuration of the all-solid-state battery 100b is the same as that of the all-solid-state battery 100b shown in FIG.

The assembled battery 300 shown in FIG. 4 has a structure in which all-solid-state batteries 100c are further stacked in the stacking direction T with respect to the assembled battery 200 shown in FIG. Specifically, the all-solid-state batteries 100c are stacked such that the second main surface 16b of the all-solid-state battery 100c and the first main surface 16a of the all-solid-state battery 100b face each other. As shown in FIG. 4, the first external electrode 21 formed on the first main surface 16a of the all-solid-state battery 100b is the same as the first external electrode 21 formed on the second main surface 16b of the all-solid-state battery 100c. It is in contact with and electrically connected to the external electrode 22 of No. 2. The first external electrode 21 of the all-solid-state battery 100b is not in contact with the first external electrode 21 of the all-solid-state battery 100c, and is electrically insulated. Further, the second external electrode 22 of the all-solid-state battery 100b is not in contact with the second external electrode 22 of the all-solid-state battery 100c, and is electrically insulated.

In this way, by simply stacking the three all-solid-state batteries 100a, 100b, and 100c, it is possible to obtain the assembled battery 300 having a structure in which the three all-solid-state batteries 100a, 100b, and 100c are connected in series.

FIG. 5 is a diagram schematically showing a side view of a battery pack 400 configured by stacking four all-solid-state batteries 100a, 100b, 100c, and 100d and connecting them in series. The configurations of all-solid-state batteries 100a and 100c are the same as the configuration of all-solid-state battery 100 shown in FIG. On the other hand, the configurations of all-solid-state batteries 100b and 100d are the same as the configuration of all-solid-state battery 100b shown in FIG. 3.

The assembled battery 400 shown in FIG. 5 has a structure in which all-solid-state batteries 100d are further stacked in the stacking direction T with respect to the assembled battery 300 shown in FIG. Specifically, the all-solid-state batteries 100d are stacked such that the second main surface 16b of the all-solid-state battery 100d and the first main surface 16a of the all-solid-state battery 100c face each other. As shown in FIG. 5, the first external electrode 21 formed on the first main surface 16a of the all-solid-state battery 100c is the same as the first external electrode 21 formed on the second main surface 16b of the all-solid-state battery 100d. It is in contact with and electrically connected to the external electrode 22 of No. 2. The first external electrode 21 of the all-solid-state battery 100c is not in contact with the first external electrode 21 of the all-solid-state battery 100d, and is electrically insulated. Further, the second external electrode 22 of the all-solid-state battery 100c is not in contact with the second external electrode 22 of the all-solid-state battery 100d, and is electrically insulated.

In this way, by simply stacking the four all-solid-state batteries 100a, 100b, 100c, and 100d, it is possible to obtain the assembled battery 400 in which the four all-solid-state batteries 100a, 100b, 100c, and 100d are connected in series. . Similarly, by stacking five or more all-solid-state batteries 100, a battery assembly having a structure in which five or more all-solid-state batteries 100 are connected in series can be obtained.

(Method for manufacturing all-solid-state battery)
An example of a method for manufacturing the all-solid-state battery 100 will be described.

First, a first green sheet for forming the positive electrode 1 is produced by applying a paste containing active material particles onto a sheet and drying it. Similarly, a second green sheet for forming the negative electrode 2 is produced. Further, a third green sheet for forming the solid electrolyte layer 3 is produced by applying a paste containing a solid electrolyte onto the sheet and drying it.

Subsequently, the first green sheet, the second green sheet, and the third green sheet are appropriately laminated and pressed to obtain an unfired laminate. Thereafter, the unfired laminate is degreased and then fired to obtain the laminate 10.

Subsequently, the first external electrode 21 and the second external electrode 22 are formed on the surface of the laminate 10. FIG. 6 is a diagram for explaining a method of forming the first external electrode 21 and the second external electrode 22 on the surface of the laminate 10.

First, as shown in FIG. 6(a), the laminate 10 is immersed in an external electrode conductive paste 31 while being tilted at a desired angle. At this time, the dimension in the length direction L of the external electrode conductive paste applied to the first main surface 16a of the laminate 10 is set to be longer than 1/2 of the dimension in the length direction L of the laminate 10. Then, the laminate 10 is immersed so that the conductive paste for external electrodes is applied to the entire first end surface 15a.

Subsequently, it is dried at a predetermined temperature (see FIG. 6(b)).

Next, as shown in FIG. 6(c), in order to apply the conductive paste for external electrodes to the opposite surface of the laminate 10, the laminate 10 is tilted at a desired angle, and the conductive paste for external electrodes Dip into conductive paste 31. At this time, the dimension in the length direction L of the external electrode conductive paste applied to the second main surface 16b of the laminate 10 is set to be longer than 1/2 of the dimension in the length direction L of the laminate 10. Then, the laminate 10 is immersed so that the conductive paste for external electrodes is applied to the entire second end surface 15b.

Subsequently, it is dried at a predetermined temperature (see FIG. 6(d)).

Subsequently, as shown in FIG. 6E, the laminate 10 is immersed in the insulating paste 32 to a predetermined depth with the first end surface 15a of the laminate 10 facing vertically downward.

Thereafter, the laminate 10 coated with the conductive paste for external electrodes and the insulating paste is fired. The all-solid-state battery 100 is obtained through the steps described above.

<Second embodiment>
FIG. 7(a) is a schematic top view when looking at the first main surface 16a of the all-solid-state battery 100 in the second embodiment, and FIG. 7(b) is a schematic top view when looking at the second main surface 16b. FIG. 7(c) is a schematic bottom view of the first side surface 17a, and FIG. 7(d) is a schematic side view of the second side surface 17b, FIG. 7(e) 7(f) is a schematic end view of the first end surface 15a side, and FIG. 7(f) is a schematic end view of the second end surface 15b side.

The all-solid-state battery 100 in the second embodiment differs from the all-solid-state battery 100 in the first embodiment in the region where the insulator 30 is formed. In the all-solid-state battery 100 in the first embodiment, the insulator 30 is provided so as to cover the region on the first end surface 15a side of the first main surface 16a, which is the first surface. In the all-solid battery 100 in the second embodiment, the region of the first main surface 16a, which is the first surface, on the first end surface 15a side, and the region of the second main surface 16b, which is the second surface. An insulator 30 is provided so as to cover each region on the second end surface 15b side.

As shown in FIGS. 7(a) and 7(e), the insulator 30 is located in a region of the first main surface 16a of the laminate 10 on the first end surface 15a side and in a region of the first end surface 15a. It is provided so as to cover the area on the first main surface 16a side of the. In addition, as shown in FIGS. 7(b) and 7(f), the insulator 30 covers a region of the second main surface 16b of the laminate 10 on the second end surface 15b side and a region on the second end surface 15b side. It is provided so as to cover the area on the second main surface 16b side. Furthermore, as shown in FIGS. 7(c) and 7(d), the insulator 30 is provided so as to also cover a portion of the first side surface 17a and a portion of the second side surface 17b.

Note that, similarly to the all-solid-state battery 100 in the first embodiment, the first external electrode 21 and the second external electrode 22 are not formed on the first side surface 17a and the second side surface 17b of the stacked body 10. It may also be a configuration.

The all-solid-state battery 100 in the second embodiment can be manufactured by the same method as the all-solid-state battery 100 in the first embodiment. However, when the laminate 10 is immersed in the insulating paste 32 (see FIG. 6(e)), the first main surface 16a of the laminate 10 is turned downward from the state in which the first end surface 15a of the laminate 10 faces vertically downward. It is immersed in the insulating paste 32 in a slightly tilted state. Further, the laminate 10 is immersed in the insulating paste 32 with the second end face 15b facing vertically downward, but with the second main face 16b facing downward.

FIG. 8A is a diagram schematically showing a side view of an assembled battery 200 configured by stacking two all-solid-state batteries 100 in the second embodiment and connecting them in series. Similar to the assembled battery 200 shown in FIG. 3, the assembled battery 200 in which the two all-solid-state batteries 100 are connected in series is configured by stacking the two all-solid-state batteries 100 in the stacking direction T.

FIG. 8(b) is a diagram schematically showing a side view of an assembled battery 300 configured by stacking three all-solid-state batteries 100 in the second embodiment and connecting them in series. Similar to the assembled battery 300 shown in FIG. 4, the assembled battery 300 in which the three all-solid-state batteries 100 are connected in series is configured by stacking the three all-solid-state batteries 100 in the stacking direction T.

FIG. 8(c) is a diagram schematically showing a side view of an assembled battery 400 configured by connecting four all-solid-state batteries 100 in series in the second embodiment. Similar to the assembled battery 400 shown in FIG. 5, the assembled battery 400 in which the four all-solid-state batteries 100 are connected in series is configured by stacking the four all-solid-state batteries 100 in the stacking direction T. Similarly, by stacking five or more all-solid-state batteries 100, a battery assembly having a structure in which five or more all-solid-state batteries 100 are connected in series can be obtained.

Here, in the all-solid-state battery 100 according to the second embodiment, as shown in FIGS. 7(e) and 7(f), the first external electrode 21 is exposed on the first end surface 15a, and The second external electrode 22 is exposed. Therefore, it is possible to further connect to another all-solid-state battery 100 or an electronic component such as a multilayer ceramic capacitor using the first end surface 15a and the second end surface 15b as contact surfaces.

<Third embodiment>
FIG. 9(a) is a schematic top view when looking at the first main surface 16a of the all-solid-state battery 100 in the third embodiment, and FIG. 9(b) is a schematic top view when looking at the second main surface 16b. 9(c) is a schematic side view of the first side surface 17a, FIG. 9(d) is a schematic side view of the second side surface 17b, and FIG. 9(e) is a schematic bottom view of the case. 9(f) is a schematic end view of the first end surface 15a side, and FIG. 9(f) is a schematic end view of the second end surface 15b side.

The all-solid-state battery 100 in the third embodiment is different from the all-solid-state battery 100 in the first embodiment in that a first external electrode 21, a second external electrode 22, and an insulator 30 are formed. It is an area.

The first external electrode 21 is formed on at least the first end surface 15a of the laminate 10, and a first surface that is one of the first main surface 16a and the first side surface 17a. In this embodiment, the first surface is the first side surface 17a, and the first external electrode 21 covers the entire first end surface 15a, a part of the first side surface 17a, and the first main surface 16a. and a portion of the second main surface 16b (see FIG. 9).

As shown in FIG. 9C, the dimension in the length direction L of the first external electrode 21 formed on the first side surface 17a, which is the first surface, is the same as that in the length direction L of the laminate 10. It is longer than 1/2 of the dimension.

The second external electrode 22 is formed on at least the second end surface 15b of the laminate 10 and the second surface facing the first surface. In this embodiment, the second surface is the second side surface 17b, and the second external electrode 22 covers the entire second end surface 15b, a part of the second side surface 17b, and the first main surface 16a. and a portion of the second main surface 16b.

As shown in FIG. 9(d), the dimension in the length direction L of the second external electrode 22 formed on the second side surface 17b, which is the second surface, is the same as that in the length direction L of the laminate 10. It is longer than 1/2 of the dimension.

Also in the all-solid-state battery 100 in this embodiment, the region on the first end surface 15a side of the first side surface 17a, which is the first surface, and the region on the first end surface 15a side of the second side surface 17b, which is the second surface. At least one of the regions on the end surface 15b side of 2 is covered with an insulator 30. Here, a region on the first end surface 15a side of the first side surface 17a that is the first surface, and a region on the second end surface 15b side of the second side surface 17b that is the second surface. are each covered with an insulator 30. In this embodiment, as shown in FIGS. 9A to 9F, not only a part of the first side surface 17a and a part of the second side surface 17b, but also a part of the first main surface 16a, A portion of the second main surface 16b, a portion of the first end surface 15a, and a portion of the second end surface 15b are also covered by the insulator 30.

The all-solid-state batteries 100 in the first and second embodiments are connected in series by stacking the first main surface 16a and the second main surface 16b of another all-solid-state battery 100 in contact with each other. is configured to do so.

On the other hand, the all-solid-state battery 100 in the third embodiment has two all-solid-state batteries 100 in such a manner that the first side surface 17a and the second side surface 17b of another all-solid-state battery 100 are in contact with each other. By abutting them, they are connected in series.

FIG. 10A is a top view schematically showing a battery pack 200 configured by connecting two all-solid-state batteries 100 in series in the third embodiment. As described above, the two all-solid-state batteries 100 are connected so that the first side 17a of one of the two all-solid-state batteries 100 and the second side 17b of the other all-solid-state battery 100 are in contact with each other. The solid state battery 100 is brought into contact.

As described above, the dimension in the length direction L of the first external electrode 21 formed on the first side surface 17a, which is the first surface, is 1/2 of the dimension in the length direction L of the laminate 10. The dimension in the length direction L of the second external electrode 22 formed on the second side surface 17b, which is the second surface, is longer than 1/2 of the dimension in the length direction L of the laminate 10. . Therefore, as shown in FIG. 10(a), when two all-solid-state batteries 100 are in contact with each other, the first external electrode 21 of one all-solid-state battery 100 is connected to the second external electrode 21 of the other all-solid-state battery 100. are in contact with the external electrodes 22 of the electrodes, thereby electrically connected to each other. The first external electrode 21 of one all-solid-state battery 100 is not in contact with the first external electrode 21 of the other all-solid-state battery 100, and is electrically insulated. Further, the second external electrode 22 of one all-solid-state battery 100 is not in contact with the second external electrode 22 of the other all-solid-state battery 100, and is electrically insulated.

FIG. 10(b) is a top view schematically showing an assembled battery 300 configured by connecting three all-solid-state batteries 100 in series in the third embodiment. The method for connecting two adjacent all-solid-state batteries 100 is the same as the method for connecting two all-solid-state batteries 100 shown in FIG. 10(a). Although not shown, a battery assembly in which four or more all-solid-state batteries 100 are connected in series can be obtained by a similar method.

<Fourth embodiment>
FIG. 11(a) is a schematic top view when looking at the first main surface 16a of the all-solid-state battery 100 in the fourth embodiment, and FIG. 11(b) is a schematic top view when looking at the second main surface 16b. FIG. 11(c) is a schematic bottom view of the first side surface 17a, and FIG. 11(d) is a schematic side view of the second side surface 17b. 11(f) is a schematic end view of the first end surface 15a side, and FIG. 11(f) is a schematic end view of the second end surface 15b side. Although not shown in FIGS. 1(c), (d), FIGS. 3(c), (d), and FIGS. 4(c), (d), other In order to understand the connection relationship when connected to the all-solid-state battery 100, the first external electrode 21 and insulator 30 are formed on the first main surface 16a, and the first external electrode 21 and the insulator 30 are formed on the second main surface 16b. The second external electrode 22 and the insulator 30 are shown as thick regions.

The all-solid-state battery 100 in the fourth embodiment is different from the all-solid-state battery 100 in the first embodiment in that a first external electrode 21, a second external electrode 22, and an insulator 30 are formed. It is an area.

The first external electrode 21 is formed on at least the first end surface 15a of the laminate 10, and a first surface that is one of the first main surface 16a and the first side surface 17a. In this embodiment, the first surface is the first main surface 16a, and the first external electrode 21 covers the entire first end surface 15a, a part of the first main surface 16a, and the first side surface. 17a and a portion of the second side surface 17b (see FIG. 11). As shown in FIG. 11(a), the area of the first external electrode 21 formed on the first main surface 16a is the same as that of the first external electrode 21 formed on the first main surface 16a of the all-solid-state battery 100 in the first embodiment. The area of the first external electrode 21 (see FIG. 1(a)) is smaller than that of the first external electrode 21 (see FIG. 1(a)). Specifically, as shown in FIG. 11A, on the first main surface 16a, there is a region on the second side surface 17b side where the first external electrode 21 is not formed.

As shown in FIG. 11(a), the dimension in the length direction L of the first external electrode 21 formed on the first main surface 16a is 1/2 of the dimension in the length direction L of the laminate 10. longer. Further, the dimension in the width direction W of the first external electrode 21 formed on the first main surface 16a is longer than 1/2 of the dimension in the width direction W of the laminate 10, and the width of the laminate 10 It is shorter than the dimension in direction W.

The second external electrode 22 is formed on at least the second end surface 15b of the laminate 10 and the second surface facing the first surface. In this embodiment, the second surface is the second main surface 16b, and the second external electrode 22 covers the entire second end surface 15b, a part of the second main surface 16b, and the first side surface. 17a and a portion of the second side surface 17b. As shown in FIG. 11(b), the area of the second external electrode 22 formed on the second main surface 16b is the same as that of the second external electrode 22 formed on the second main surface 16b of the all-solid-state battery 100 in the first embodiment. The area of the second external electrode 22 (see FIG. 1(b)) is smaller than that of the second external electrode 22 (see FIG. 1(b)). Specifically, as shown in FIG. 11(b), on the second main surface 16b, there is a region on the first side surface 17a side where the second external electrode 22 is not formed.

As shown in FIG. 11(b), the dimension in the length direction L of the second external electrode 22 formed on the second main surface 16b is 1/2 of the dimension in the length direction L of the laminate 10. longer. Further, the dimension in the width direction W of the second external electrode 22 formed on the second main surface 16b is longer than 1/2 of the dimension in the width direction W of the laminate 10, and the width of the laminate 10 It is shorter than the dimension in direction W.

The first external electrode 21 on the first main surface 16a and the second external electrode 22 on the second main surface 16b are coated with ink containing a conductive paste for external electrodes by, for example, inkjet printing. After processing, it can be formed by firing.

Note that, similarly to the all-solid-state battery 100 in the first embodiment, the first external electrode 21 and the second external electrode 22 are not formed on the first side surface 17a and the second side surface 17b of the stacked body 10. It may also be a configuration.

The insulator 30 has a region on the first end surface 15a side of the first main surface 16a that is the first surface, and a second end surface of the second main surface 16b that is the second surface. They are formed so as to respectively cover the area on the side 15b. The insulator 30 can be formed, for example, by applying ink containing an insulating material by inkjet printing.

According to the all-solid-state battery 100 in the fourth embodiment, compared to the all-solid-state battery 100 in the first embodiment, the amount of conductive paste for external electrodes used can be reduced, reducing manufacturing costs. can do.

FIG. 12A is a side view schematically showing an assembled battery 200 configured by stacking two all-solid-state batteries 100 and connecting them in series in the fourth embodiment. The connection relationship between the two all-solid-state batteries 100 is the same as the connection relationship between the two all-solid-state batteries 100a and 100b shown in FIG. That is, the first external electrode 21 on the first main surface 16a of the lower all-solid-state battery 100 in the stacking direction T, and the second external electrode on the second main surface 16b of the upper all-solid-state battery 100. 22 are electrically connected to each other by contacting each other.

Note that, as described above, the dimension in the length direction L of the first external electrode 21 formed on the first main surface 16a is longer than 1/2 of the dimension in the length direction L of the laminate 10; The dimension in the length direction L of the second external electrode 22 formed on the second main surface 16b is longer than 1/2 of the dimension in the length direction L of the laminate 10. Further, the dimension in the width direction W of the first external electrode 21 formed on the first main surface 16a is longer than 1/2 of the dimension in the width direction W of the laminate 10, and The dimension of the formed second external electrode 22 in the width direction W is longer than 1/2 of the dimension of the laminate 10 in the width direction W. With such a structure, when two all-solid-state batteries 100 are stacked, the first external electrode 21 of one all-solid-state battery 100 and the second external electrode 22 of the other all-solid-state battery 100 are reliably connected. It can be brought into contact.

FIG. 12(b) is a side view schematically showing an assembled battery 300 configured by stacking three all-solid-state batteries 100 and connecting them in series in the fourth embodiment. The connection relationship between the three all-solid-state batteries 100 is the same as the connection relationship between the three all-solid-state batteries 100a, 100b, and 100c shown in FIG. Although not shown, a battery assembly in which four or more all-solid-state batteries 100 are connected in series can be obtained by a similar method.

In addition, in the all-solid-state battery 100 in the fourth embodiment, as shown in FIGS. Since the second external electrode 22 is exposed, it can be further connected to another all-solid-state battery 100 or an electronic component such as a multilayer ceramic capacitor using the first end surface 15a and the second end surface 15b as contact surfaces. becomes possible.

<Fifth embodiment>
FIG. 13(a) is a schematic top view when looking at the first main surface 16a of the all-solid-state battery 100 in the fifth embodiment, and FIG. 13(b) is a schematic top view when looking at the second main surface 16b. FIG. 13(c) is a schematic bottom view of the first side surface 17a, and FIG. 13(d) is a schematic side view of the second side surface 17b. 13(f) is a schematic end view of the first end surface 15a side, and FIG. 13(f) is a schematic end view of the second end surface 15b side.

The all-solid-state battery 100 in the fifth embodiment is different from the all-solid-state battery 100 in the first embodiment in that a first external electrode 21, a second external electrode 22, and an insulator 30 are formed. It is an area.

The first external electrode 21 is formed on at least the first end surface 15a of the laminate 10 and the first surface that is one of the first main surface 16a and the first side surface 17a. . In this embodiment, the first surface is the first main surface 16a, and the first external electrode 21 covers the entire first end surface 15a, a part of the first main surface 16a, and the first side surface. 17a and a portion of the second side surface 17b (see FIG. 13). As shown in FIG. 13(a), the first external electrode 21 formed on the first main surface 16a extends from the first end surface 15a side to the second end surface 15b side in the central part in the width direction W. It is formed in such a manner that it extends to. That is, the first external electrode 21 is formed only in the central region in the width direction W of the first main surface 16a.

As shown in FIG. 13(a), the dimension in the length direction L of the first external electrode 21 formed on the first main surface 16a is 1/2 of the dimension in the length direction L of the laminate 10. longer.

The second external electrode 22 is formed on at least the second end surface 15b of the laminate 10 and the second surface facing the first surface. In this embodiment, the second surface is the second main surface 16b, and the second external electrode 22 covers the entire second end surface 15b, a part of the second main surface 16b, and the first side surface. 17a and a portion of the second side surface 17b. As shown in FIG. 13(b), the second external electrode 22 formed on the second main surface 16b moves from the second end surface 15b side to the first end surface 15a side in the center part in the width direction W. It is formed in such a manner that it extends to. That is, the second external electrode 22 is formed only in the central region in the width direction W of the second main surface 16b.

As shown in FIG. 13(b), the dimension in the length direction L of the second external electrode 22 formed on the second main surface 16b is 1/2 of the dimension in the length direction L of the laminate 10. longer.

The first external electrode 21 formed on the first main surface 16a and the second external electrode 22 formed on the second main surface 16b are made of, for example, a conductive paste for external electrodes. It can be formed by applying the containing ink by inkjet printing and then firing.

Note that, similarly to the all-solid-state battery 100 in the first embodiment, the first external electrode 21 and the second external electrode 22 are not formed on the first side surface 17a and the second side surface 17b of the stacked body 10. It may also be a configuration.

The insulator 30 has a region on the first end surface 15a side of the first main surface 16a that is the first surface, and a second end surface of the second main surface 16b that is the second surface. They are formed so as to respectively cover the area on the side 15b. The insulator 30 can be formed, for example, by applying ink containing an insulating material by inkjet printing.

According to the all-solid-state battery 100 in the fifth embodiment, the amount of conductive paste for external electrodes used can be further reduced compared to the all-solid-state battery 100 in the fourth embodiment, so manufacturing costs can be reduced. It can be further reduced.

FIG. 14(a) is a side view schematically showing an assembled battery 200 configured by stacking two all-solid-state batteries 100 and connecting them in series in the fifth embodiment. The connection relationship between the two all-solid-state batteries 100 is the same as the connection relationship between the two all-solid-state batteries 100a and 100b shown in FIG. That is, the first external electrode 21 on the first main surface 16a of the lower all-solid-state battery 100 in the stacking direction T, and the second external electrode on the second main surface 16b of the upper all-solid-state battery 100. 22 are electrically connected to each other by contacting each other.

FIG. 14(b) is a side view schematically showing an assembled battery 300 configured by stacking three all-solid-state batteries 100 and connecting them in series in the fifth embodiment. The connection relationship between the three all-solid-state batteries 100 is the same as the connection relationship between the three all-solid-state batteries 100a, 100b, and 100c shown in FIG. Although not shown, a battery assembly in which four or more all-solid-state batteries 100 are connected in series can be obtained by a similar method.

In addition, in the all-solid-state battery 100 in the fifth embodiment, as shown in FIGS. 13(e) and 13(f), the first external electrode 21 is exposed on the first end surface 15a, and the first external electrode 21 is exposed on the second end surface 15b. Since the second external electrode 22 is exposed, it can be further connected to another all-solid-state battery 100 or an electronic component such as a multilayer ceramic capacitor using the first end surface 15a and the second end surface 15b as contact surfaces. becomes possible.

The present invention is not limited to the above embodiments, and various applications and modifications can be made within the scope of the present invention.

In the all-solid-state battery 100 in the first embodiment, only the region on the first end surface 15a side of the first main surface 16a, which is the first surface, on which the first external electrode 21 is formed is insulated. Although the structure is covered by the body 30, the region on the second end surface 15b side of the second main surface 16b, which is the second surface, where the second external electrode 22 is formed is also insulated. It may be covered by the body 30.

1 Positive electrode 2 Negative electrode 3 Solid electrolyte layer 10 Laminated body 21 First external electrode 22 Second external electrode 31 Conductive paste for external electrode 32 Insulating paste 100 All-solid battery 200, 300, 400 Assembled battery

Claims (9)

a positive electrode having a first main surface, a second main surface, a first side surface, a second side surface, a first end surface, and a second end surface and drawn out to the first end surface; a laminate including a negative electrode drawn out to a second end surface, and a solid electrolyte layer disposed between the positive electrode and the negative electrode;
a first external electrode formed on at least the first end surface of the laminate and a first surface that is the first main surface , and electrically connected to the positive electrode;
A second surface formed on at least the second end surface of the laminate and a second surface, which is the second main surface opposite to the first main surface, and electrically connected to the negative electrode. an external electrode;
Equipped with
The dimension of the first external electrode formed on the first surface in the length direction where the first end surface and the second end surface face each other is the dimension of the laminate in the length direction. longer than 1/2 of
The dimension in the length direction of the second external electrode formed on the second surface is longer than 1/2 of the dimension in the length direction of the laminate;
A region of the first surface on the first end surface side where the first external electrode is formed, and a region of the second surface where the second external electrode is formed. An all-solid-state battery, wherein at least one of the regions on the second end surface side is covered with an insulator. The first external electrode includes the entire first end surface and a portion of the first main surface of the laminate , as well as a portion of the first side surface and the second side surface. It is formed as a part of
The second external electrode includes the entire second end surface and a portion of the second main surface of the laminate , as well as a portion of the first side surface and the second side surface. The all-solid-state battery according to claim 1 , wherein the all-solid-state battery is formed as a part of the solid-state battery. The dimension of the first external electrode formed on a part of the first main surface in the width direction where the first side surface and the second side surface face each other is the width direction of the laminate. longer than 1/2 of the dimension in the width direction of the laminate, and shorter than the dimension in the width direction of the laminate;
The dimension in the width direction of the second external electrode formed on a part of the second main surface is longer than 1/2 of the dimension in the width direction of the laminate, and The all-solid-state battery according to claim 2 , wherein the all-solid-state battery is shorter than the dimension in the width direction. The first external electrode formed on a part of the first main surface is located on the first end surface side at a central portion in the width direction where the first side surface and the second side surface face each other. is formed in such a manner as to extend from the second end surface side to the second end surface side,
The second external electrode formed on a part of the second main surface is formed in a central portion in the width direction so as to extend from the second end surface side to the first end surface side. The all-solid-state battery according to claim 2 , characterized in that: The insulator includes a region on the first end surface side of the first surface where the first external electrode is formed, and a region on the first end surface side where the second external electrode is formed. 5. The all-solid-state battery according to claim 1 , wherein each of the two surfaces of the solid-state battery covers a region on the second end surface side. An assembled battery configured by a plurality of all-solid-state batteries according to any one of claims 1 to 5 brought into contact with each other,
The first external electrode is formed on the first main surface of one of the two all-solid-state batteries that overlap each other, and the second external electrode is formed on the second main surface of the other all-solid-state battery. The assembled battery is characterized in that the second external electrode is in contact with and electrically connected to the second external electrode. a positive electrode having a first main surface, a second main surface, a first side surface, a second side surface, a first end surface, and a second end surface and drawn out to the first end surface; a laminate including a negative electrode drawn out to a second end surface, and a solid electrolyte layer disposed between the positive electrode and the negative electrode;
a first external electrode formed on at least the first end surface and the first side surface of the laminate and electrically connected to the positive electrode;
a second external electrode formed on at least the second end surface of the laminate and a second surface that is the second side surface opposite to the first side surface and electrically connected to the negative electrode; and,
Equipped with
The dimension of the first external electrode formed on the first surface in the length direction where the first end surface and the second end surface face each other is the dimension of the laminate in the length direction. longer than 1/2 of
The dimension in the length direction of the second external electrode formed on the second surface is longer than 1/2 of the dimension in the length direction of the laminate;
A region of the first surface on the first end surface side where the first external electrode is formed, and a region of the second surface where the second external electrode is formed. An all-solid-state battery, wherein at least one of the regions on the second end surface side is covered with an insulator. The first external electrode includes the entire first end surface and a portion of the first side surface of the laminate, as well as a portion of the first main surface and the second main surface. It is formed as a part of
The second external electrode includes the entire second end surface and a portion of the second side surface of the laminate, as well as a portion of the first main surface and the second main surface. The all-solid-state battery according to claim 7 , wherein the all-solid-state battery is formed as a part of the solid- state battery. An assembled battery configured by bringing a plurality of all-solid-state batteries according to claim 7 or 8 into contact with each other,
The first external electrode is formed on the first side surface of one of the two all-solid-state batteries that are in contact with each other, and the first external electrode is formed on the second side surface of the other all-solid-state battery. The assembled battery is characterized in that the second external electrode is in contact with and electrically connected to the second external electrode.

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