JP2016001602A - Solid state battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid state battery capable of coping with various kinds of battery housing parts and being prevented from falling off from the battery housing part even as a battery pack.SOLUTION: Disclosed is a solid state battery 10 having a laminate 19 which is equipped with a first electrode layer 12, a solid electrolyte layer 13, and a second electrode layer 11. The solid state battery 10 is characterized in that a first electrode layer 12 and a second electrode layer 11 are drawn out in the direction opposite to each other and are connected to a first internal terminal 21 and a second internal terminal 23 of the side surfaces of a laminate 19, there are further provided with a first external terminal 22 formed on the first internal terminal 21 and connected so as to expose a part of the first internal terminal 21 and a second external terminal 24 formed on the second internal terminal 23 and connected so as to expose a part of the second internal terminal 23, and the second external terminal 24 extends to the upper surface of the laminate 19 while the first external terminal 22 extends to the lower surface of the laminate 19.

Description

  The present invention relates to a solid state battery.

In recent years, lithium ion secondary batteries have been widely used as power sources and power storage devices for consumer electronic devices such as information terminals and game machines such as mobile phones and smartphones.
An organic solvent is used as an electrolyte in a general non-aqueous lithium ion secondary battery. Therefore, there is a possibility that liquid leakage or the like may occur due to an unexpected impact, and a more reliable lithium ion secondary battery is desired.

As a more reliable lithium ion secondary battery, research and development of an all-solid secondary battery using a solid electrolyte made of an inorganic material instead of an organic solvent as an electrolyte has been actively conducted. For example, as described in Patent Document 1, by replacing the organic solvent with a solid electrolyte made of an inorganic material, there is no risk of liquid leakage, and a highly reliable lithium ion secondary battery can be obtained.

  In addition, since the all-solid-state secondary battery disclosed in Patent Document 1 can be manufactured in a small size of 1 cm square or less, it can be suitably used for small electronic devices such as mobile devices. However, in order to obtain a desired capacity for various small electronic devices, it is necessary to use a plurality of all-solid-state secondary batteries, and it must be possible to mount them in various battery storage units for each small electronic device. .

  Patent Document 2 proposes a shape design of a battery package that can connect a plurality of battery packages to produce a battery pack having an arbitrary shape.

Japanese Patent No. 2004-273436 JP 2010-232102 A

However, in the design of the battery package described in Patent Document 2, it is necessary to prepare a battery package having a complicated shape in addition to the battery, and the capacity per unit volume is reduced. In a solid battery, it is difficult to directly process and form a complex shape as disclosed, and even if it can be processed, the strength of the solid battery itself is significantly reduced.
Moreover, if it is made into the conventional simple structure like patent document 1, even if it mounts in the battery accommodating part of a small electronic device since it is not assembled, even if it comprises a some battery in series and parallel, it combines and combines. After that, it may fall off due to vibration or the like.

  Therefore, the present invention has an object to provide a solid battery that can be applied to various battery storage units and can prevent the assembled battery from dropping out of the battery storage unit.

  In order to solve the above problems, the solid battery of the present invention is a solid battery having a laminate including a first electrode layer, a solid electrolyte layer, and a second electrode layer, wherein the first electrode layer and the second electrode layer are provided. Are pulled out in opposite directions, respectively connected to the first internal terminal and the second internal terminal on the side surface of the laminate, and further formed on the first internal terminal to expose a part of the first internal terminal. A first external terminal to be connected; and a second external terminal formed on the second internal terminal and connected to expose a part of the second internal terminal, the second external terminal being the laminated layer The first external terminal extends to the lower surface of the laminated body, and extends to the upper surface of the body.

  According to such a configuration, since the terminal pulled out to the side surface of the laminated body exposes a part of the side surface and extends to the upper surface or the lower surface of the solid battery, a plurality of solid batteries are engaged and connected. As a result, it is possible to deal with a variety of battery storage parts, and even when mounted in the battery storage part, it can be prevented from falling off.

  The solid state battery according to the present invention is configured so that the second external terminal on the upper surface of the laminate and the first external terminal on the lower surface of the laminate of another solid battery adjacent to the solid battery can be directly connected. The terminal and the second external terminal are respectively extended on the upper surface and the lower surface, the length extended from the side surface of the second external terminal on the upper surface of the multilayer body, and the side surface of the first external terminal on the lower surface of the multilayer body It is preferable that the total length of each of the lengths extended from is not less than the distance between the side surfaces of the laminate.

  According to such a configuration, even if it is mounted on the battery storage unit, it can be prevented from falling off.

  Further, in the solid state battery according to the present invention, the second external terminal on the upper surface of the laminate includes a portion whose tip is thinner than the thickness of the second external terminal, and the first external terminal on the lower surface of the laminate. Is preferably provided with a portion whose tip is thinner than the thickness of the first external terminal.

  According to such a configuration, even when the battery is mounted in the battery storage unit, the engagement between the solid batteries is further improved, and the dropout can be further prevented.

  In addition, in the solid state battery according to the present invention, the second external terminal on the upper surface of the stacked body includes a portion whose tip is gradually thinner than the thickness of the second external terminal. It is preferable that the 1 external terminal is provided with the part which the front-end | tip part becomes gradually thinner than the thickness of the said 1st external terminal.

  According to such a configuration, even when the battery is mounted in the battery storage unit, the engagement between the solid batteries is further improved, and the dropout can be further prevented.

The solid state battery according to the present invention may be configured such that when another solid state battery is adjacent to the second side surface of the stacked body facing the direction perpendicular to the direction connecting the first internal terminal and the second internal terminal. It is preferable to have a recess capable of accommodating the terminal.
According to such a configuration, even when the battery storage unit is mounted in a 2-series / 2-parallel state, for example, the solid batteries can be easily meshed with each other, so that they can be prevented from falling off.

ADVANTAGE OF THE INVENTION According to this invention, the solid battery which can respond to various battery storage parts and can prevent the drop-off from a battery storage part also as an assembled battery can be provided.

It is sectional drawing of the solid battery of 1st Embodiment. It is a schematic diagram when the solid battery of 1st Embodiment is seen from the side surface side. It is a schematic diagram when the solid battery of 1st Embodiment is seen from the terminal side. It is a schematic diagram of the solid battery of 2nd Embodiment. It is a schematic diagram of the solid battery of 3rd Embodiment. It is a schematic diagram of the solid battery of 4th Embodiment. It is a schematic diagram of the assembled battery which connected three solid batteries in series. It is a schematic diagram of an assembled battery in which two solid batteries are connected in series.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

<First Embodiment>
(Solid battery)
1, 2 and 3 show a solid state battery 10 of the first embodiment. The solid battery 10 is a solid battery having a rectangular parallelepiped laminate 19 including a first electrode layer 12, a solid electrolyte layer 13, and a second electrode layer 11, wherein the first electrode layer and the second electrode layer are mutually connected. The first external terminals 22 are pulled out in the reverse direction and connected to the first internal terminal 21 and the second internal terminal 23 on the side surfaces of the laminate, respectively, and further cover the first internal terminal 21 and the second internal terminal 23, respectively. And the second external terminal 24 is connected to expose a part of the first internal terminal 21 and the second internal terminal 23, the second external terminal 24 extends to the top surface of the stacked body, and the first external terminal 24 The external terminal 22 extends to the lower surface of the laminate, and the first external terminal 22 and the second external terminal 24 extend to approximately half the distance between the opposing side surfaces. Yes.

(Laminate)
In the cross section of the laminate shown in FIG. 1, the first electrode 12 is a positive electrode layer, and the second electrode layer 11 is a negative electrode layer. The first electrode layer 12 and the second electrode layer 11 are alternately laminated via the solid electrolyte layer 13, and the first electrode layer 12 is a positive electrode current collector layer 16 and a positive electrode active material layer formed on both sides or one side thereof. The second electrode layer 11 includes a negative electrode current collector layer 14 and a negative electrode active material layer 15 formed on both sides or one side thereof. In FIG. 1, since the negative electrode layer 11 positioned at the uppermost layer has the positive electrode layer 12 opposite to the lower side, the negative electrode active material layer 15 is formed only on the lower surface. Similarly, the positive electrode layer 12 positioned at the lowermost layer has the positive electrode active material layer 17 formed only on one upper surface because the opposite negative electrode layer 11 is only on the upper side. The solid electrolyte layer 13 is made of a solid electrolyte, the positive electrode current collector layer 16 is made of a positive electrode current collector, the positive electrode active material layer 17 is made of a positive electrode active material, and the negative electrode current collector layer 14 is made of a negative electrode current collector. Thus, the negative electrode active material layer 15 is made of a negative electrode active material. A laminate 19 composed of the first electrode layer 12, the second electrode layer 11, and the solid electrolyte layer 13 is covered with a protective layer 29. The positive electrode current collector layer 16 and the negative electrode current collector layer 14 are drawn to the outside by a first terminal 20 and a second terminal 25, respectively. The first terminal 20 includes a first internal terminal 21 and a first external terminal 22, and the second terminal 25 includes a second internal terminal 23 and a second external terminal 24. The protective layer 29 described above covers portions other than the first external terminal 22 and the second external terminal 24.

FIG. 1 shows a cross-sectional view of a parallel-type solid battery 10 in which five power storage elements are stacked. However, the technology related to the solid state battery 10 of the first embodiment is not limited to the parallel type in which the five power storage elements shown in FIG. 1 are laminated, and a solid state battery in which any plural layers are laminated or a series type solid state. The present invention can be applied to a battery and can be widely changed according to the required capacity and current specifications of the solid battery 10.

(Solid electrolyte)
As the solid electrolyte constituting the solid electrolyte layer 13 of the solid battery 10 of the present embodiment, it is preferable to use a material having low electron conductivity and high lithium ion conductivity. For example, perovskite type compounds such as La _0.5 Li _0.5 TiO ₃ , silicon type compounds such as Li ₁₄ Zn (GeO ₄ ) ₄ , garnet type compounds such as Li ₇ La ₃ Zr ₂ O ₁₂ , Li _1. NASICON compounds such as ₃ Al _0.3 Ti _1.7 (PO ₄ ) ₃ and Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ , Li _3.25 Ge _0.25 P _0.75 Thiolicone type compounds such as S ₄ and Li ₃ PS ₄ , glass compounds such as Li ₂ S—P ₂ S ₅ and Li ₂ O—V ₂ O ₅ —SiO ₂ , Li ₃ PO ₄ and Li _3.5 Si _0. It is desirable that it is at least one selected from the group consisting of phosphoric acid compounds such as ₅ P _0.5 O ₄ and Li _2.9 PO _3.3 N _0.46 .

(Positive electrode active material and negative electrode active material)
As the positive electrode active material and the negative electrode active material constituting the positive electrode active material layer 17 and the negative electrode active material layer 15, it is preferable to use a material that can efficiently insert and desorb lithium ions. For example, it is preferable to use a transition metal oxide or a transition metal composite oxide. Specifically, the lithium manganese composite oxide _{Li 2 Mn x3 Ma 1-x3} O 3 (0.8 ≦ x3 ≦ 1, Ma = Co, Ni), lithium cobaltate (LiCoO _2), lithium nickelate (LiNiO ₂ ), Lithium manganese spinel (LiMn ₂ O ₄ ), and a general formula: LiNi _x4 Co _y4 Mn _z4 O ₂ (x4 + y4 + z4 = 1, 0 ≦ x4 ≦ 1, 0 ≦ y4 ≦ 1, 0 ≦ z4 ≦ 1) Composite metal oxide, lithium vanadium compound (LiV ₂ O ₅ ), olivine type LiMbPO ₄ (where Mb is one or more selected from Co, Ni, Mn, Fe, Mg, Nb, Ti, Al, Zr) Element), lithium vanadium phosphate (Li ₃ V ₂ (PO ₄ ) ₃ or LiVOPO ₄ ), Li-rich solid solution positive electrode Li ₂ MnO ₃ -L iMcO ₂ (Mc = Mn, Co, Ni), lithium titanate (Li ₄ Ti ₅ O ₁₂ ), Li _a Ni _x5 Co _y5 Al _z5 O ₂ (0.9 <a <1.3, 0.9 <x5 + y5 + z5) It is preferably any of the composite metal oxides represented by <1.1).

In particular, Li _{1 + x2} Al _x2 Ti _2-x2 (PO ₄ ) ₃ (0 ≦ x2 ≦ 0.6) is applied to the solid electrolyte layer 13, and LiVOPO ₄ and Li are applied to one or both of the positive electrode active material layer 17 and the negative electrode active material layer 15. _When one or both of ₃ V ₂ (PO ₄ ) ₃ is used, the bonding at the interface between one or both of the positive electrode active material layer 17 and the negative electrode active material layer 15 and the solid electrolyte 3 becomes strong, and at the same time, the contact area Is desirable because it can be widely used.

  Moreover, there is no clear distinction in the active material which comprises the positive electrode active material layer 17 or the negative electrode active material layer 15, Comparing the electric potential of two types of compounds, The compound which shows a more noble electric potential is used as a positive electrode active material. A compound exhibiting a lower potential can be used as the negative electrode active material.

(Positive electrode current collector and negative electrode current collector)
As the positive electrode current collector and the negative electrode current collector constituting the positive electrode current collector layer 16 and the negative electrode current collector layer 14 of the solid battery 10 of the present embodiment, it is preferable to use a material having high conductivity, for example, silver Palladium, gold, platinum, aluminum, copper, nickel, etc. are preferably used. In particular, copper is preferable because it hardly reacts with the positive electrode active material, the negative electrode active material, and the solid electrolyte, and is effective in reducing the internal resistance of the solid battery 10. The positive electrode current collector and the negative electrode current collector constituting the positive electrode current collector layer 16 and the negative electrode current collector layer 14 may be the same for the positive electrode and the negative electrode, or may be different.

  The positive electrode current collector layer 16 and the negative electrode current collector layer 14 preferably include a positive electrode active material and a negative electrode active material, respectively. The content ratio in that case is not particularly limited as long as it functions as a current collector, but the positive electrode current collector / positive electrode active material or the negative electrode current collector / negative electrode active material has a volume ratio of 90/10 to 70/30. A range is preferable.

  When the positive electrode current collector layer 16 and the negative electrode current collector layer 14 include a positive electrode active material and a negative electrode active material, respectively, the positive electrode current collector layer 16, the positive electrode active material layer 17, the negative electrode current collector layer 14, and the negative electrode active material This is desirable because adhesion to the layer 15 is improved.

(Protective layer)
The protective layer 29 of the solid battery 10 of the present embodiment is formed on the outermost layer of the solid battery, and is for electrical, physical and chemical protection. The protective layer 29 is not necessarily indispensable, and may be only the uppermost layer or only the lowermost layer, but is preferably formed in order to improve the reliability of the solid battery 10. The material constituting the protective layer 29 is preferably excellent in insulation, durability and moisture resistance and environmentally safe. For example, it is preferable to use glass, ceramics, thermosetting resin, or photocurable resin. Only one type of material for the protective layer may be used, or a plurality of materials may be used in combination. The protective layer may be a single layer, but it is preferable to provide a plurality of layers. Among these, an organic-inorganic hybrid in which a thermosetting resin and ceramic powder are mixed is particularly preferable.

(Terminal)
For the first terminal 20 and the second terminal 25 of the solid battery 10 of the present embodiment, it is preferable to use a material having high electrical conductivity, for example, silver, gold, platinum, aluminum, copper, tin, or nickel. The first terminal 20 includes a first internal terminal 21 and a first external terminal 22, and the second terminal 25 includes a second internal terminal and a second external terminal. The same material may be used for the internal terminal (first internal terminal and second internal terminal) and the external terminal (first external terminal and second external terminal), or different materials may be used. Furthermore, the first external terminal and the second external terminal may be formed of a single layer or a plurality of layers.

(Method for manufacturing solid battery)
In the solid battery 10 of this embodiment, the positive electrode current collector layer 16, the positive electrode active material layer 17, the solid electrolyte layer 13, the negative electrode active material layer 15, and the negative electrode current collector layer 14 are pasted, applied, and dried. A green sheet is produced, the green sheets are laminated, the produced laminated sheet is fired at the same time, and then the protective layer 29 is applied to produce the laminate 19.

  The method for forming the paste is not particularly limited, and for example, a paste can be obtained by mixing the powder of each of the above materials in a vehicle. Here, the vehicle is a general term for the medium in the liquid phase. The vehicle includes a solvent and a binder. By this method, the paste for the positive electrode current collector layer 16, the paste for the positive electrode active material layer 17, the paste for the solid electrolyte layer 13, the paste for the negative electrode active material layer 15, and the paste for the negative electrode current collector layer 14 Is made.

The prepared paste is applied in a desired order on a base material such as PET (polyethylene terephthalate) and dried as necessary, and then the base material is peeled to prepare a green sheet. The paste application method is not particularly limited, and a known method such as screen printing, application, transfer, doctor blade, or the like can be employed.

  The green sheets for the positive electrode current collector layer 16, the positive electrode active material layer 17, the solid electrolyte layer 13, the negative electrode active material layer 15, and the negative electrode current collector layer 14 that are produced are stacked in a desired order. Stacked by number, alignment, cutting, etc. are performed as necessary to produce a laminated sheet. In the case of manufacturing a parallel type or series-parallel type battery, it is preferable to align and stack the end surfaces of the positive electrode layer and the negative electrode layer so that they do not coincide with each other.

  In producing a laminated block, a positive electrode active material layer unit and a negative electrode active material layer unit described below may be prepared to produce a laminated block.

  First, a solid electrolyte layer 13 paste is formed into a sheet shape on a PET film by a doctor blade method to obtain a solid electrolyte layer 13 sheet, and then screen printed on the solid electrolyte layer 13 sheet. The positive electrode active material layer 17 paste is printed and dried. Next, a paste for the positive electrode current collector layer 16 is printed thereon by screen printing and dried. Further thereon, the paste for the positive electrode active material layer 17 is printed again by screen printing, dried, and then the PET film is peeled off to obtain a positive electrode active material layer unit. Thus, the positive electrode active material layer unit in which the positive electrode active material layer 17 paste, the positive electrode current collector layer 16 paste, and the positive electrode active material layer 17 paste are formed in this order on the solid electrolyte layer 13 sheet. obtain. A negative electrode active material layer unit is also produced in the same procedure, and the negative electrode active material layer 15 paste, the negative electrode current collector layer 14 paste, and the negative electrode active material layer 15 paste are arranged in this order on the solid electrolyte layer 13 sheet. A formed negative electrode active material layer unit is obtained.

  One positive electrode active material layer unit and one negative electrode active material layer unit are combined into a paste for positive electrode active material layer 17, a paste for positive electrode current collector layer 16, a paste for positive electrode active material layer 17, a sheet for solid electrolyte layer 13, a negative electrode The active material layer 15 paste, the negative electrode current collector layer 14 paste, the negative electrode active material layer 15 paste, and the solid electrolyte layer 13 sheet are stacked in this order. At this time, the paste for the positive electrode current collector layer 16 of the first positive electrode active material layer unit extends only to one end face, and the paste for the negative electrode current collector layer 14 of the second negative electrode active material layer unit is the other. Stagger each unit so that it extends only to the surface. The solid electrolyte layer 13 sheets having a predetermined thickness are further stacked on both surfaces of the stacked units to produce a stacked block.

  The produced laminated sheet is crimped together. The pressure bonding is performed while heating, and the heating temperature is, for example, 40 to 95 ° C.

  The laminated sheet thus pressure-bonded is heated and fired, for example, at 600 ° C. to 1000 ° C. in a nitrogen atmosphere. The firing time is, for example, 0.1 to 3 hours.

  The sintered laminate may be put into a cylindrical container together with an abrasive such as alumina and barrel-polished. Thereby, the corners of the laminate can be chamfered. As another method, polishing may be performed by sandblasting. This method is preferable because only a specific portion can be removed.

(Terminal formation)
A first internal terminal 21 and a second internal terminal 23 are attached to the sintered laminate 19. The first internal terminal and the second internal terminal are formed so as to be in electrical contact with the positive electrode current collector layer 16 and the negative electrode current collector layer 14, respectively. For example, the positive electrode current collector layer 16 and the negative electrode current collector layer 14 exposed from the side surface of the laminate 19 are preferably formed by a sputtering method or a dipping method.

Next, the first external terminal 22 and the second external terminal 24 are formed so as to be in electrical contact with the first internal terminal 21 and the second internal terminal 23, respectively. The first external terminal 22 and the second external terminal 24 are preferably formed by sputtering, dipping, or spray coating. At this time, desired portions of the first internal terminal 21 and the second internal terminal 23 are masked with, for example, tape, and then the first external terminal 22 and the second external terminal 24 are formed.

(Protective layer formation)
After the terminal formation described above, a known formation method may be used as the formation method of the protective layer 29. The protective layer 29 is preferably formed by sputtering, dipping, or spray coating. It is preferable that the first terminal and the second terminal are not completely covered with the protective layer 29. For example, it is desirable to mask with tape or to select a material that repels the terminal electrode as the material of the protective layer 29. In this way, the solid battery 10 is completed.

The protective layer is formed so that the thickness of the protective layer 16 on the upper surface and the lower surface of the laminate is thinner than the thickness of the first terminal and the second terminal, particularly on the upper surface and the lower surface, in order to improve the engagement of the solid battery. .

Second Embodiment
As a second embodiment, in the solid state battery shown in FIG. 4, the second external terminal on the top surface of the laminate extends from the end of the laminate, and the end of the second external terminal on the end side of the second external terminal. The first external terminal on the lower surface of the laminate is similarly extended from the end of the laminate, and the thickness of the end of the first external terminal is larger than the thickness of the first external terminal. Also has a thin part.
According to such a configuration, even when the battery is mounted in the battery storage unit, the engagement between the solid batteries is further improved, and the dropout can be further prevented.
The tip side does not mean a particularly narrow region, and is preferably less than half the length of the second external terminals formed on the top surface of the laminate.

<Third Embodiment>
Further, as a third embodiment, in the solid state battery shown in FIG. 5, the second external terminal on the upper surface of the stacked body extends from the end of the stacked body, and the end side of the second external terminal is on the tip side. The first external terminal on the lower surface of the laminate extends from the end of the laminate, and the end of the first external terminal on the tip side of the first external terminal. It has a portion that gradually becomes thinner than the thickness of the side.
According to such a configuration, even when the battery is mounted in the battery storage unit, the engagement between the solid batteries is further improved, and the dropout can be further prevented.
The tip side does not mean a particularly narrow region, and is preferably less than half the length of the second external terminals formed on the top surface of the laminate.

<Fourth embodiment>
Moreover, as a fourth embodiment, the solid state battery shown in FIG. 6 has another solid state battery adjacent to the second side surface facing the direction perpendicular to the direction connecting the first internal terminal and the second internal terminal. Sometimes it has a recess that can accommodate the terminal.
According to such a configuration, even if the battery storage unit is mounted in a two-series, two-parallel state as shown in FIG.

  In FIG. 6, the dent is also formed in a groove shape from the upper surface to the lower surface of the solid battery. However, it is not always necessary to reach the lower surface from the upper surface, and an external terminal of another adjacent solid battery may be accommodated. Therefore, a recess having the same width and / or the same length as the external terminal may be formed. It is preferable that the recesses have the same width and / or the same length because the engagement is further improved.

<Fifth Embodiment>
(Battery)
As a fifth embodiment, FIG. 7 shows a three-series assembled battery in which three solid batteries are arranged in series.
First, a box was made using the case 51 and the case internal terminal 52, and a battery pack case 50 as shown in FIG. An assembled battery was produced by mounting the above-mentioned three series assembled batteries in the case. The solid battery 10 is engaged with the terminals of the upper surface and the lower surface to prevent the solid battery from falling off the case.

  In this way, the second external terminal on the upper surface of the laminate and the first external terminal on the lower surface of the laminate of another solid battery adjacent to the solid battery are directly connected, so that the solid batteries are engaged with each other, and the case Even if it is mounted on the battery, it is possible to prevent the solid battery from falling off.

  Since the first external terminal on the upper surface of the multilayer body and the second external terminal on the lower surface of the multilayer body are for engaging the solid state batteries with each other, the first external terminal extends from the side surface of the second external terminal on the upper surface of the multilayer body. It is preferable that the total length of the length to be extended from the side surface of the first external terminal on the lower surface of the laminate is equal to or greater than the distance between the side surfaces of the laminate. For example, it may be extended 1 to 1 or may be extended 7 to 3.

<Sixth Embodiment>
(Battery)
Further, as a sixth embodiment, FIG. 8 shows a two-series and two-parallel assembled battery in which two solid batteries are arranged in series and in parallel.
A box for 2 series and 2 parallel shown in FIG. 8 was produced by the same production method as that for the assembled battery case 50 described above. An assembled battery was manufactured by mounting the above-described two series and two parallel assembled batteries in the case. In addition to the solid battery 10 engaging with the terminals on the upper surface and the lower surface, the terminals of the solid battery 10 connected in series are further provided with side surfaces other than the terminals of the adjacent solid battery 10 in series and the terminal housing formed on the side surface. Engaging with possible recesses, it is possible to prevent the battery from dropping out of the case even in an assembled battery equipped with a large number of solid batteries.

  Similarly to the fifth embodiment, the first external terminal on the upper surface of the multilayer body and the second external terminal on the lower surface of the multilayer body are for engaging solid batteries with each other. 2 The length extended from the side surface of the external terminal and the length extended from the side surface of the first external terminal on the lower surface of the laminate are such that the total length is equal to or greater than the distance between the side surfaces of the laminate. Preferably there is. For example, it may be extended 1 to 1 or may be extended 7 to 3. Moreover, the same variation as the fourth embodiment is preferable for the dent.

1 to 6, typical solid battery configurations have been described. The positive electrode and negative electrode active material layers are 1 to 10 μm, the positive electrode and negative electrode current collector layers are 1 to 10 μm, and the solid electrolyte layers are What is necessary is just to form 1-200 micrometers, 10-200 micrometers in a protective layer, and the thickness of an internal terminal or an external terminal in the range of 1-50 micrometers. By appropriately adjusting these, it is possible to produce a small solid battery in which the appearance size of the solid battery is, for example, 3.5 mm × 2 mm × 2 mm.

Claims (5)

In a solid battery having a laminate including a first electrode layer, a solid electrolyte layer, and a second electrode layer,
The first electrode layer and the second electrode layer are drawn out in opposite directions, and connected to the first internal terminal and the second internal terminal on the side surface of the laminate,
Further, a first external terminal formed on the first internal terminal and connected to expose a part of the first internal terminal, and a part of the second internal terminal formed on the second internal terminal are exposed. A second external terminal connected to
The solid state battery, wherein the second external terminal extends to an upper surface of the stacked body, and the first external terminal extends to a lower surface of the stacked body. The first external terminal and the second external terminal so that the second external terminal on the upper surface of the stacked body and the first external terminal on the lower surface of the stacked body of another solid battery adjacent to the solid battery can be directly connected. External terminals are respectively extended on the upper surface and the lower surface,
The length extended from the side surface of the second external terminal on the upper surface of the laminate and the length extended from the side surface of the first external terminal on the lower surface of the laminate are the sum of the respective lengths. The solid battery according to claim 1, wherein the distance is greater than or equal to a distance between side surfaces of the laminate. The second external terminal on the upper surface of the laminate includes a portion whose tip is thinner than the thickness of the second external terminal,
3. The solid state battery according to claim 1, wherein a tip end portion of the first external terminal on the lower surface of the stacked body includes a portion thinner than a thickness of the first external terminal. . The second external terminal on the upper surface of the laminate includes a portion whose tip is gradually thinner than the thickness of the second external terminal,
The said 1st external terminal in the lower surface of the said laminated body is provided with the part from which the front-end | tip part becomes gradually thinner than the thickness of the said 1st external terminal, The Claim 1 characterized by the above-mentioned. The solid battery described.   The second side surface of the stacked body facing the direction perpendicular to the direction connecting the first internal terminal and the second internal terminal has a recess capable of accommodating the terminal when another solid battery is adjacent to the second side surface. The solid battery according to any one of claims 1 to 4, wherein

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