WO2023171759A1 - Solid state battery module - Google Patents

Abstract

An embodiment of the present invention provides a solid state battery module comprising: a solid state battery that has a positive electrode layer, a negative electrode layer, and a solid state electrolyte layer provided between the positive electrode layer and the negative electrode layer; a conductor unit; a heating unit; and a substrate. The solid state battery is disposed on the substrate, and the heating unit and the solid state battery can be thermally coupled to each other via the conductor unit.

Description

solid state battery module

The present invention relates to a solid state battery module. More specifically, the present invention relates to a solid state battery that is modularized so that it can be mounted on a board.

Secondary batteries that can be repeatedly charged and discharged have been used for a variety of purposes. For example, secondary batteries are used as power sources for electronic devices such as smartphones and notebook computers. In secondary batteries, a liquid electrolyte is generally used as a medium for ion movement that contributes to charging and discharging. In other words, so-called electrolytes are used in secondary batteries. However, in such secondary batteries, safety is generally required in terms of preventing electrolyte leakage. Furthermore, since the organic solvent used in the electrolyte is a flammable substance, safety is also required in this respect.

Therefore, research is progressing on solid-state batteries that use solid electrolytes instead of electrolytes. A solid-state battery has a battery element including a positive electrode layer, a negative electrode layer, and a solid electrolyte interposed between the positive electrode layer and the negative electrode layer.

JP2009-87814A

It has long been known to heat the solid battery to increase the ionic conductivity of the solid electrolyte in order to improve the charging characteristics of the solid battery. Conventionally, a method has been adopted in which the electrode layer side is heated via an insulating layer positioned between the heating section and the electrode layer of the solid-state battery, specifically the current collector (see Patent Document 1). ). However, in this embodiment, since the heating section and the electrode layer are separated by the thickness of the intervening insulating layer, it is difficult to say that the solid battery is suitably heated by the heating section as a whole.

The present invention has been made in view of such problems. That is, an object of the present invention is to provide a solid state battery module that can suitably heat a solid state battery.

In order to achieve the above purpose,
A solid battery including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer, a conductor part, a heating part, and a substrate,
the solid state battery is disposed on the substrate,
A solid-state battery module is provided, in which the heating section and the solid-state battery can be thermally coupled via the conductor section.

According to the solid state battery module according to an embodiment of the present invention, the solid state battery that is a component of the module can be suitably heated.

FIG. 1 is a cross-sectional view schematically showing the configuration of a modular solid-state battery according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the minimum distance between the opposing surface of the conductor portion facing the solid battery and the solid battery. FIG. 3 is a plan view schematically showing the relationship in plane size between a modular solid-state battery and battery elements according to an embodiment of the present invention. FIG. 4 is a cross-sectional view schematically showing a modular solid-state battery according to another embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a modularized solid-state battery according to another embodiment of the present invention. FIG. 6 is a cross-sectional view schematically showing a modular solid-state battery according to another embodiment of the present invention. FIG. 7 is a cross-sectional view schematically showing a modularized solid state battery according to another embodiment of the present invention. FIG. 8 is a cross-sectional view schematically showing a modularized solid state battery according to another embodiment of the present invention. FIG. 9 is a cross-sectional view schematically showing a modular solid-state battery according to another embodiment of the present invention. FIG. 10 is a cross-sectional view schematically showing a modular solid-state battery according to another embodiment of the present invention. FIG. 11 is a plan view schematically showing an arrangement of conductor parts according to an embodiment of the present invention. FIG. 12 is a cross-sectional view schematically showing a modularized solid-state battery according to another embodiment of the present invention. FIG. 13A is a process cross-sectional view schematically showing a manufacturing process of a solid state battery module according to an embodiment of the present invention. FIG. 13B is a process cross-sectional view schematically showing a manufacturing process of a solid state battery module according to an embodiment of the present invention. FIG. 13C is a process cross-sectional view schematically showing a manufacturing process of a solid state battery module according to an embodiment of the present invention. FIG. 13D is a process cross-sectional view schematically showing a manufacturing process of a solid state battery module according to an embodiment of the present invention.

Hereinafter, a solid state battery module according to an embodiment of the present invention will be specifically described. Although the explanation will be made with reference to the drawings as necessary, the contents shown in the drawings are merely shown schematically and exemplarily for understanding the present invention, and the appearance, dimensional ratio, etc. may differ from the actual thing.

In a broad sense, the term "solid battery module" used herein refers to a solid state battery device that is configured to protect a solid battery from the external environment, and in a narrow sense, it refers to a solid battery device configured to protect a solid battery from the external environment. It refers to a protected, mountable solid-state battery device. A solid state battery module may also be referred to as a solid state battery package.

In this specification, "cross-sectional view" refers to the shape viewed from a direction substantially perpendicular to the stacking direction in the stacked structure of a solid-state battery (simply put, the cross-sectional view when cut along a plane parallel to the thickness direction of the layers) form). In addition, "planar view" or "planar view shape" as used in this specification is based on a sketch when the object is viewed from above or below along the thickness direction of such layers (i.e., the above-mentioned lamination direction). ing.

The "up-down direction" and "left-right direction" used directly or indirectly in this specification correspond to the up-down direction and the left-right direction in the drawings, respectively. Unless otherwise specified, the same reference numerals or symbols indicate the same members/parts or the same meanings. In a preferred embodiment, the vertically downward direction (that is, the direction in which gravity acts) corresponds to the "downward direction"/"bottom side", and the opposite direction corresponds to the "upward direction"/"top side". I can do it.

In the present invention, the term "solid battery" refers to a battery whose constituent elements are made of solid matter, and in a narrow sense, it refers to an all-solid-state battery whose constituent elements are made of solid matter. In a preferred embodiment, the solid-state battery of the present invention is a stacked solid-state battery configured such that the layers constituting the battery constituent units are stacked on each other, and preferably each layer is made of a fired body. A "solid battery" includes not only a so-called "secondary battery" that can be repeatedly charged and discharged, but also a "primary battery" that can only be discharged. According to a preferred embodiment of the present invention, the "solid battery" is a secondary battery. The term "secondary battery" is not excessively limited by its name, and may include, for example, power storage devices. Note that, in the present invention, the solid-state battery included in the module can also be referred to as a "solid-state battery element."

FIG. 1 is a cross-sectional view schematically showing the configuration of a modular solid-state battery according to an embodiment of the present invention. As shown in FIG. 1, a solid state battery module 1000 according to an embodiment of the present invention includes a solid state battery 100 provided on a substrate 200. Specifically, the solid state battery module 1000 includes a board 200 that contributes to mounting, and a solid state battery 100 provided on the board 200 and protected from the external environment.

[Basic configuration of solid-state battery]
Below, first, the basic configuration of the solid state battery 100 will be explained. The configuration of the solid-state battery described here is merely an example for understanding the invention, and does not limit the invention. The solid battery 100 includes at least positive and negative electrode layers and a solid electrolyte. Specifically, the solid battery 100 has a battery element that includes a battery structural unit consisting of a positive electrode layer, a negative electrode layer, and at least a solid electrolyte interposed between them.

In the solid state battery 100, each of its constituent layers may be formed by firing, and the positive electrode layer, negative electrode layer, solid electrolyte, etc. may form the fired layers. Preferably, the positive electrode layer, the negative electrode layer, and the solid electrolyte are integrally fired with each other, and therefore, it is preferable that the battery element forms an integrally fired body.

The positive electrode layer is an electrode layer containing at least a positive electrode active material. The positive electrode layer may further contain a solid electrolyte. In a preferred embodiment, the positive electrode layer may be composed of a fired body containing at least positive electrode active material particles and a solid electrolyte. On the other hand, the negative electrode layer is an electrode layer containing at least a negative electrode active material. The negative electrode layer may further contain a solid electrolyte. In a preferred embodiment, the negative electrode layer may be composed of a sintered body containing at least negative electrode active material particles and a solid electrolyte.

A positive electrode active material and a negative electrode active material are substances that participate in the transfer of electrons in a solid battery. Ions move (conduct) between the positive electrode layer and the negative electrode layer via the solid electrolyte, and electrons are exchanged to perform charging and discharging. It is particularly preferable that each electrode layer of the positive electrode layer and the negative electrode layer is a layer capable of intercalating and deintercalating lithium ions or sodium ions. That is, the solid battery is preferably an all-solid-state secondary battery in which lithium ions or sodium ions move between a positive electrode layer and a negative electrode layer via a solid electrolyte to charge and discharge the battery.

(Cathode active material)
Examples of the positive electrode active material contained in the positive electrode layer 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, and a lithium-containing phosphoric acid compound having a spinel-type structure. At least one selected from the group consisting of oxides and the like can be mentioned. An example of a lithium-containing phosphoric acid compound having a Nasicon type structure includes Li ₃ V ₂ (PO ₄ ) ₃ and the like. Examples of lithium-containing phosphate compounds having an olivine structure include Li ₃ Fe ₂ (PO ₄ ) ₃ , LiFePO ₄ , and/or LiMnPO ₄ . Examples of lithium-containing layered oxides include LiCoO ₂ and/or LiCo _1/3 Ni _1/3 Mn _1/3 O ₂ . Examples of lithium-containing oxides having a spinel structure include LiMn ₂ O ₄ and/or LiNi _0.5 Mn _1.5 O ₄ .

In addition, as positive electrode active materials capable of intercalating and releasing sodium ions, sodium-containing phosphoric acid compounds having a Nasicon-type structure, sodium-containing phosphoric acid compounds having an olivine-type structure, sodium-containing layered oxides, and spinel-type structures are used. At least one selected from the group consisting of sodium-containing oxides and the like can be mentioned.

(Negative electrode active material)
Examples of the negative electrode active material contained in the negative electrode layer include oxides containing at least one element selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, and Mo, carbon materials such as graphite, and graphite-lithium. At least one selected from the group consisting of compounds, lithium alloys, lithium-containing phosphoric acid compounds having a Nasicon-type structure, lithium-containing phosphoric acid compounds having an olivine-type structure, lithium-containing oxides having a spinel-type structure, etc. It will be done. An example of a lithium alloy is Li-Al. Examples of lithium-containing phosphoric acid compounds having a Nasicon type structure include Li ₃ V ₂ (PO ₄ ) ₃ and/or LiTi ₂ (PO ₄ ) ₃ . Examples of the lithium-containing phosphoric acid compound having an olivine structure include Li ₃ Fe ₂ (PO ₄ ) ₃ and/or LiCuPO ₄ . An example of a lithium-containing oxide having a spinel structure is Li ₄ Ti ₅ O ₁₂ and the like.

In addition, negative electrode active materials capable of intercalating and releasing sodium ions include sodium-containing phosphoric acid compounds having a Nasicon-type structure, sodium-containing phosphoric acid compounds having an olivine-type structure, and sodium-containing oxides having a spinel-type structure. At least one selected from the group consisting of:

Note that in the solid battery, the positive electrode layer and the negative electrode layer may be made of the same material.

The positive electrode layer and/or the negative electrode layer may contain a conductive material. Examples of the conductive material contained in the positive electrode layer and the negative electrode layer include at least one metal material such as silver, palladium, gold, platinum, aluminum, copper, and nickel, and carbon.

Furthermore, the positive electrode layer and/or the negative electrode layer may contain a sintering aid. Examples of the sintering aid include at least one selected from the group consisting of lithium oxide, sodium oxide, potassium oxide, boron oxide, silicon oxide, bismuth oxide, and phosphorus oxide.

The thickness of the positive electrode layer and the negative electrode layer is not particularly limited, but may be, for example, independently 2 μm or more and 50 μm or less, particularly 5 μm or more and 30 μm or less.

(Positive electrode current collecting layer/Negative electrode current collecting layer)
Although not essential elements of the electrode layer, the positive electrode layer and the negative electrode layer may each include a positive electrode current collecting layer and a negative electrode current collecting layer. Each of the positive electrode current collecting layer and the negative electrode current collecting layer may be in the form of a foil. However, if more emphasis is placed on improving electronic conductivity through integral firing, reducing manufacturing costs of solid-state batteries, and/or reducing internal resistance of solid-state batteries, then the positive electrode current collecting layer and the negative electrode current collecting layer should each form a fired body. It may have. As the positive electrode current collecting layer and the negative electrode current collecting layer, it is preferable to use a material with high electrical conductivity, and for example, silver, palladium, gold, platinum, aluminum, copper, and/or nickel may be used. The positive electrode current collecting layer and the negative electrode current collecting layer may each have an electrical connection part for electrically connecting with the outside, and may be configured to be electrically connectable to the end surface electrode. Note that when the positive electrode current collecting layer and the negative electrode current collecting layer are fired bodies, they may be composed of fired bodies containing a conductive material and a sintering aid. The conductive material contained in the positive electrode current collection layer and the negative electrode current collection layer is selected from, for example, the same materials as the conductive materials contained in the positive electrode layer and the negative electrode layer. The sintering aid contained in the positive electrode current collecting layer and the negative electrode current collecting layer is selected, for example, from the same materials as the sintering aid contained in the positive electrode layer and the negative electrode layer. As described above, a positive electrode current collecting layer and a negative electrode current collecting layer are not necessarily required in a solid battery, and a solid battery that is not provided with a positive electrode current collecting layer and a negative electrode current collecting layer is also conceivable. That is, the solid state battery included in the module of the present invention may be a solid state battery without a current collecting layer.

(solid electrolyte)
A solid electrolyte is a material that can conduct lithium ions or sodium ions. In particular, a solid electrolyte that forms a battery constituent unit in a solid battery is a layer that can conduct lithium ions between a positive electrode layer and a negative electrode layer. Specific solid electrolytes include, for example, lithium-containing phosphate compounds having a Nasicon structure, oxides having a perovskite structure, oxides having a garnet-type or garnet-like structure, oxide glass ceramic-based lithium ion conductors, and sulfide. Examples include glass ceramics-based lithium ion conductors, oxide-based glass materials, and sulfide-based glass materials. As an example of an oxide having an amorphous structure, an oxide having a composition containing a glassy substance made of Li, B, Si, and O and a halogen such as Cl or Br as an additive can be used.

The lithium-containing phosphoric acid compound having the above Nasicon structure includes Li _{x My} (PO ₄ ) ₃ (1≦x≦2, 1≦y≦2, M is composed of Ti, Ge, Al, Ga, and Zr). at least one selected from the group). An example of a lithium-containing phosphoric acid compound having a Nasicon structure includes Li _1.2 Al _0.2 Ti _1.8 (PO ₄ ) ₃ and the like. Examples of oxides having a perovskite structure include La _0.55 Li _0.35 TiO ₃ and the like. An example of an oxide having a garnet type or garnet type similar structure includes Li ₇ La ₃ Zr ₂ O ₁₂ and the like. Examples of oxide glass-ceramic lithium ion conductors include phosphoric acid compounds containing lithium, aluminum and titanium as constituent elements (LATP), phosphoric acid compounds containing lithium, aluminum and germanium as constituent elements (LAGP), etc. It will be done. Further, examples of the sulfide glass ceramic lithium ion conductor include Li ₇ P ₃ S ₁₁ and Li _3.25 P _0.95 S ₄ .

Examples of the oxide glass material include 50Li ₄ SiO ₄ .50Li ₃ BO ₃ and the like. Sulfide glass materials include, for example _, 30Li ₂ S.26B ₂ S 3.44LiI, _{63Li 2} S.36SiS 2.1Li _{3 PO 4} , 57Li ₂ S.38SiS 2.5Li ₄ SiO ₄ and 70Li ₂ S. Examples include 30P ₂ S ₅ and 50Li 2 S.50GeS _{2 .}

If more emphasis is placed on excellent atmospheric stability and ease of integral sintering, the solid electrolyte is selected from the group consisting of oxides, oxide glass ceramics-based lithium ion conductors, and oxide-based glass materials. It may contain at least one kind.

Examples of the solid electrolyte that can conduct sodium ions include sodium-containing phosphoric acid compounds having a Nasicon structure, oxides having a perovskite structure, and oxides having a garnet type or garnet type similar structure. As a sodium-containing phosphate compound having a Nasicon structure, Na _{x My} (PO ₄ ) ₃ (1≦x≦2, 1≦y≦2, M is from the group consisting of Ti, Ge, Al, Ga and Zr) at least one selected type).

The solid electrolyte may contain a sintering aid. The sintering aid contained in the solid electrolyte is selected, for example, from the same materials as the sintering aid contained in the positive electrode layer and the negative electrode layer.

The thickness of the solid electrolyte is not particularly limited. The thickness of the solid electrolyte located between the positive electrode layer and the negative electrode layer may be, for example, 1 μm or more and 50 μm or less, particularly 10 μm or more and 40 μm or less.

(end face electrode)
Solid state batteries are generally provided with end electrodes 120. In particular, end electrodes 120 are provided on the side surfaces of the solid state battery. More specifically, an end surface electrode 120A on the positive electrode side connected to the positive electrode layer and an end surface electrode 120B on the negative electrode side connected to the negative electrode layer are provided (see FIG. 1). Preferably, such end electrodes include a material with high electrical conductivity. Specific materials for the end electrodes are not particularly limited, but may include at least one selected from the group consisting of silver, gold, platinum, aluminum, copper, tin, and nickel. Note that antimony, bismuth, indium, zinc, aluminum, etc., which form an alloy with tin, may be included.

[Basic configuration of solid battery module]
Below, the basic configuration of the solid state battery module will be explained. As described above, the solid state battery module 1000 according to one embodiment of the present invention includes the substrate 200 and the solid state battery 100 provided on the substrate 200 (see FIG. 1). Therefore, by interposing the substrate 200 between the solid-state battery 100 and an external substrate, it is possible to suppress the entry of water vapor into the solid-state battery 100.

Further, as shown in FIG. 1, the substrate 200 has a main surface larger than, for example, a solid state battery. As the substrate 200, a printed circuit board can be used. The type thereof is not particularly limited, and may be a resin substrate or a ceramic substrate. Furthermore, a rigid substrate or a flexible substrate may be used. Note that examples of the ceramic substrate include an alumina substrate, an LTCC substrate, or an HTCC substrate. The resin substrate may be made of a material in which a base material is impregnated with resin. Examples of the base material include paper, glass fiber cloth, and resin film. The resin may be a thermoplastic resin and/or a thermosetting resin. For example, paper phenolic substrates made by impregnating a paper base material with phenolic resin, paper epoxy substrates made by impregnating a paper base material with epoxy resin, glass epoxy substrates made by impregnating glass fiber cloth with epoxy resin, polyimide and PET (polyethylene terephthalate), etc. Examples include flexible substrates using talate resin.

The substrate is preferably a member for electrically connecting the modular solid-state battery to the outside. In other words, it can be said that the substrate serves as a terminal substrate for the external terminals of the solid-state battery. In a solid state battery module equipped with such a substrate, the solid state battery can be mounted on another secondary substrate such as a printed wiring board with the substrate interposed therebetween. For example, it can be surface mounted using solder or conductive paste. For this reason, the solid state battery module of the present invention is preferably an SMD (Surface Mount Device) type battery module.

Furthermore, it is preferable that not only the substrate 200 but also the solid state battery module 1000 itself be configured to prevent water vapor permeation as a whole. For example, in the solid state battery module 1000 according to one embodiment of the present invention, the solid state battery 100 provided on the substrate 200 can be covered with the covering part 500 so as to be completely surrounded. Specifically, the solid battery 100 on the substrate 200 is modularized so that the main surface 100A and the side surface 100B are surrounded by the covering part 500.

[Characteristics of the present invention]
Hereinafter, the characteristic parts of the present invention will be explained.

The inventor of the present application has diligently studied solutions for suitably heating the solid state battery 100 (specifically, the battery element 110) in the solid state battery module 1000, and as a result, has published a book having the following technical idea. He came up with an invention.

Specifically, the technical idea of the present invention is to "thermally couple the heating section 300 as a heat source and the solid battery 100 via the conductor section 400" (see FIG. 1). As used herein, "thermal coupling" refers to a state in which one component (heating section) and another component (solid-state battery) are thermally coupled, that is, thermally connected and/or heat transfer Refers to a possible state. Furthermore, the term "conductor section" as used herein refers to a component having thermal conductivity.

According to this technical idea, the heat of the heating section 300 can be suitably transferred to the solid battery 100 via the conductor section 400. Thereby, the solid state battery 100, ie, the battery element 110 of the solid state battery 100, can be suitably heated. As a result, it becomes possible to increase the ionic conductivity of the solid electrolyte, and it becomes possible to improve the charging and discharging characteristics of the solid battery 100 as a whole.

In one embodiment, as shown in FIG. 1, the conductor section 400 and the heating section 300 may be provided between the solid state battery 100 and the substrate 200. That is, the conductor part 400 and the heating part 300 can be arranged below the solid state battery 100, specifically, the battery element 110. According to this arrangement, the overall size of the solid state battery module 1000 can be reduced. Further, the heating unit 300 may be arranged on the main surface 210 (hereinafter also referred to as the first main surface) of the substrate 200 on the side facing the solid battery 100.

Note that the heating unit 300 does not necessarily need to be disposed between the solid battery 100 and the substrate 200, but may be placed anywhere on the first main surface 210 of the substrate 200 (between the solid battery 100 and the substrate 200). (including locations where there is no such thing).

Further, the conductor section 400 may be provided between the heating section 300 and the solid battery 100. For example, the conductor section 400 may be placed adjacent to and/or in direct contact with the heating section 300. When the conductor section 400 is adjacent to the heating section 300, the wiring 220 provided on the first main surface 210 of the substrate 200, specifically, so that both the heating section 300 and the conductor section 400 are adjacent to each other in cross-sectional view share metal wiring.

By sharing such wiring, heat from the heating section 300 can be suitably transferred to the conductor section 400 via the wiring having heat conductive properties. The wiring 220 may be made of, for example, Cu plated with Au (Cu-Au), or Cu plated with Ni and Au (Cu-Ni-Au). Although not particularly limited, the thickness of the wiring 220 can be 2 to 50 μm, for example 30 μm.

On the other hand, when the conductor part is in direct contact with the heating part 300, the conductor part 400D is provided on the heating part 300 so that the conductor part and the heating part 300 form a row in cross-sectional view (see FIG. 7). With such a row-like arrangement, heat from the heating section 300 can be suitably transferred to the conductor section 400D without using wiring having heat conductive properties.

Furthermore, since the conductor section 400D and the heating section 300 can form a row, the thermal conductivity of the group consisting of the conductor section 400D and the heating section 300 is improved compared to the case where the conductor section 400 and the heating section 300 are arranged adjacently. The number of partial aggregates can be increased. Thereby, the heat of the heating section 300 can be more suitably transferred to the solid battery 100 side, specifically, to the battery element 110 side via the conductor section 400D.

The conductor part 400 can be a metal conductor part. The metal conductor portion may be made of at least one material selected from the group consisting of Cu, Al, and Au. The metal conductor portion may be a pillar-shaped metal conductor portion. Note that the term "pillar-shaped metal conductor section" as used herein mainly refers to a column-shaped metal conductor section that extends in a predetermined direction, but it also refers to a column-shaped metal conductor section that has a bent or curved portion at a predetermined location. Also includes the department. As an example of the conductor portion 400, a metal pin, for example, a Cu pin can be used. As the heating section 300, a PTC heater or the like can be used.

As shown in FIG. 1, when the conductor part 400 and the heating part 300 are provided between the solid battery 100 and the substrate 200, and the conductor part 400 is provided between the heating part 300 and the solid battery 100, in cross-sectional view, The minimum distance D1 between the solid battery 100 and the opposing surface 410 of the conductor portion 400 facing the solid battery 100 is smaller than the minimum distance D2 between the solid battery 100 and the substrate 200. Specifically, the minimum distance D1 between the facing surface 410 of the conductor section 400 that faces the battery element 110 and the battery element 110 is smaller than the minimum distance D2 between the battery element 110 and the substrate 200. For example, the minimum distance D1 between the opposing surface 410 of the conductor section 400 that faces the solid battery 100 and the solid battery 100 is between 0% and 50% of the minimum distance L2 between the solid battery 100 and the substrate 200. obtain.

Note that if the minimum distance D1 between the facing surface 410 of the conductor section 400 and the solid state battery 100 falls within a predetermined range, the conductor section 400 does not necessarily need to be disposed between the solid state battery 100 and the substrate 200. Instead, the conductor portion 400 may extend from the substrate 200 side so as to be able to face the side surface of the battery element 110 or the like.

Further, as shown in the plan view of FIG. 3, the planar size of the solid-state battery module 1000 may be 110% or more and 250% or less, preferably 150% or more and 200% or less, of the planar size of the battery element 110 of the solid-state battery 100. In this case, the heating section 300 and the conductor section 400 are not only arranged so as to overlap the battery element 110, but also at least a part thereof is arranged within the covering section 500 that covers the side and top surfaces of the battery element 110 of the solid-state battery. It's good that it has been done.

The present invention preferably adopts the following embodiments.

In one embodiment, the heating section 300 may further include a low thermal conductivity section 600 having a relatively lower thermal conductivity than that of the conductor section 400, and the heating section 300 may be provided between the low thermal conduction section 600 and the conductor section 400. Preferred (see Figure 4).

In the embodiment (basic form) of the present invention described above, the heat of the heating section 300 can be suitably transferred to the solid battery 100 side via the conductor section 400. In this basic form, in order to enable electrical control, the wiring 220 of the substrate 200 is connected from the first main surface 210 side through the interior of the substrate 200 to the opposite side of the first main surface 210. It continues to the second main surface 230 side (mounting side). Therefore, the heat of the heating section 300 arranged on the wiring 220 on the first main surface 210 of the substrate 200 may go out not only through the conductor section 400 side but also through the second main surface 230 side of the substrate 200. There is.

In view of this point, in this embodiment, a heating section 300 is provided between the low thermal conductivity section 600 and the conductor section 400 (see FIG. 4). That is, the heating section 300 can be sandwiched between the low thermal conductivity section 600 and the conductor section 400. Note that as the low thermal conductivity portion 600, a ceramic jumper resistor, a ceramic chip fuse, or the like having electrical short-circuit characteristics can be used. As the material of the low thermal conductivity portion 600, for example, a material containing an inorganic insulator such as alumina can be used.

According to this configuration, since the low thermal conductivity section 600 has a relatively lower thermal conductivity than that of the conductor section 400, the heat generated from the heating section 300 is transferred from the first principal surface 210 side of the substrate 200 to the second principal surface 210 side of the substrate 200. Movement toward the main surface 230 can be suppressed. By such suppression, the power consumed by the heating section 300 to generate heat can also be suppressed.

In one embodiment, it is preferable that a conductive adhesive layer 700 is further provided between the conductor portion 400 and the solid battery 100 in a cross-sectional view (see FIG. 5).

According to this aspect, the conductive adhesive layer 700 can be positioned between the conductor portion 400 and the solid battery 100, specifically the battery element 110. The conductive adhesive layer 700 is a layer that has conductive and adhesive properties. Due to this property, one side 710 of the conductive adhesive layer 700 can be in contact with the conductor section 400 and the other side 720 can be in contact with the battery element 110. That is, the conductive adhesive layer 700 can be in contact with the conductor portion 400 and the solid battery 100. Thereby, the electrical connection between the solid battery 100 and the conductor portion 400 can be ensured by the conductive adhesive layer 700, and the physical connection strength between the two can be improved. Note that, from the viewpoint of preventing short circuits, it is preferable that the conductive adhesive layer 700 is separated from the end electrode 120.

Furthermore, it is more preferable that the width of the conductive adhesive layer 700 is larger than the width of the facing surface 410 of the conductor portion 400. According to this configuration, in addition to the electrical connection and physical connection strength between the solid-state battery 100 and the conductor part 400, the heat of the heating part is transmitted from the conductor part 400 to the inside of the solid-state battery 100. be able to. That is, more suitable heat transfer to the inside of the solid state battery 100 becomes possible.

In addition to this, in one embodiment, it is more preferable that a conductive adhesive layer 800 is further provided to be wrapped around the outer periphery of the battery element 110 of the solid battery 100 (see FIGS. 6 and 7). Alternatively, from a similar viewpoint, in one embodiment, the battery element 110 is further provided with a second conductor portion 850 that partially surrounds the battery element 110, and the second conductor portion 850 is provided to face the conductor portion 400 in a cross-sectional view. It is more preferable to do so (see FIG. 8). As an example, the second conductor portion 850 may be a housing-like metal conductor. Note that as the conductive adhesive layers 700 and 800, for example, metal foil, solder, etc. can be used. As the second conductor portion 850, for example, metal foil, solder, conductive paste, etc. can be used. The conductive paste may be at least one material selected from the group consisting of Cu, Al, Au, and Ni. As the second conductor section 850, for example, one made of Cu foil can also be used. Note that the solder is not particularly limited, but at least one type selected from the group consisting of SnAgCu type, SnAg type, SnSb type, AuSn type, and AlZn type can be used.

According to this configuration, in addition to the electrical connection and physical connection strength between the solid state battery 100 and the conductor section 400, the heat of the heating section 300 is further spread from the conductor section 400 into the inside of the solid state battery 100. can be conveyed to. That is, even more suitable heat transfer to the inside of the battery element 110 is possible. Note that as the conductive adhesive layers 700 and 800, for example, an Ag conductive adhesive layer can be used.

In one aspect, it is preferable that the covering portion 500 includes at least a covering insulating layer 510 (see FIGS. 6 to 8). Covering insulating layer 510 is a layer provided so as to cover main surface 100A and side surface 100B of solid battery 100. The entire solid state battery 100 on the substrate 200 is largely covered by such a covering insulating layer.

The covering insulating layer 510 may be made of any material as long as it exhibits insulating properties. For example, the covering insulating layer may contain a resin, and the resin may be either a thermosetting resin or a thermoplastic resin. The covering insulating layer may contain an inorganic filler. Although this is just one example, the covering insulating layer may be made of an epoxy resin containing an inorganic filler such as SiC, SiO ₂ , SiN, or the like.

According to this configuration, since the insulating cover layer 510 has a relatively lower thermal conductivity than the conductor part 400, the heat of the heating part 300 transmitted to the solid battery 100 side is radiated to the outside via the cover part 500. It is possible to suppress the Further, all the surfaces forming the solid state battery 100 are not exposed to the outside, and water vapor permeation can be suitably prevented.

More preferably, the covering portion 500 may include a covering insulating layer 510 and a covering inorganic layer 520. The solid state battery 100 may be covered with a covering insulating layer 510 and a covering inorganic layer 520 of the covering portion 500 (see FIGS. 6 to 8).

The covering inorganic layer 520 is provided to cover the covering insulating layer. Since the covering inorganic layer is positioned on the covering insulating layer, it has a form that largely envelops the solid battery 100 on the substrate 200 together with the covering insulating layer. This coated inorganic layer may have a film form, for example. Furthermore, the covering inorganic layer can also cover the side surfaces of the substrate 200. The insulating coating layer together with the inorganic coating layer forms a suitable water vapor barrier, and the inorganic coating layer also forms a suitable water vapor barrier together with the insulating coating layer.

The term "barrier" as used herein means having a property of preventing water vapor permeation to such an extent that water vapor in the external environment does not pass through the substrate and cause deterioration of characteristics that are disadvantageous to the solid-state battery. In a narrow sense, this means that the water vapor permeability is less than 5×10 ⁻³ g/(m ² ·Day). To put it simply, the water vapor barrier layer preferably has a water vapor permeability of 0 or more and less than 5×10 ⁻³ g/(m ² ·Day).

The material of the covering inorganic layer 520 is not particularly limited, and may be metal, glass, oxide ceramics, or a mixture thereof. The covering inorganic layer may correspond to an inorganic layer in the form of a thin film, and in this case it is preferably a metal film, for example. By way of example only, the inorganic coating layer may be composed of a plated Cu-based and/or Ni-based material having a thickness of 2 to 50 μm.

Note that as a method for suppressing heat radiation to the outside through the covering part 500, not only the material properties of the covering part 500 but also providing a gap 530 in the covering part 500F (covering insulating layer 510F) as shown in FIG. This allows discontinuous heat transfer to the outside. Thereby, it is possible to maintain an improved state of the ionic conductivity of the solid electrolyte, and as a result, it becomes possible to maintain an improved state of the charging and discharging characteristics of the solid battery 100.

In one aspect, it is preferable that the device further includes a temperature detection device 900 capable of detecting the temperature of the solid battery 100, and that the temperature detection device 900 is provided between the solid battery 100 and the substrate 200 (see FIG. 10). As the temperature detection device 900, an NTC thermistor can be used. With such a temperature sensing device 900, the temperature inside the solid-state battery 100, specifically, the temperature inside the battery element 110, can be measured in a timely manner. As a result, heating control of the heating section 300 can be performed stably by checking the temperature situation inside the battery element 110. Further, since it is possible to control the heating unit 300 so that it is not driven except when necessary, abnormal heating of the heating unit 300 and excessive current consumption of the heating unit 300 can be suppressed.

Note that the temperature sensing device 900 is arranged adjacent to a joining member 950 (that is, equivalent to a metal pin for an electrode) that is responsible for electrically connecting the end surface electrode of the solid battery 100 (for example, the negative end surface electrode 122) and the substrate 200. It is more preferable that According to such an adjacent arrangement, the temperature sensing device 900 and the bonding member 950 can share the wiring 220 arranged on the first main surface 210 of the substrate 200. Therefore, one electrode (eg, negative electrode) side of the battery and the temperature sensing device 900 can be interconnected not only electrically but also thermally via the wiring 220.

Note that the distance between the conductor section 400 and the heating section 300 adjacent thereto and the temperature detection device 900 is longer than the distance between the temperature detection device 900 and the electrode joining member (i.e., equivalent to the metal pin for the electrode). It is preferable to make it long. As a result, the temperature sensing device 900 unnecessarily detects not only the temperature inside the battery element 100 but also the heating temperature of the heating section 300 and/or the heat transfer temperature of the conductor section 400, and It is possible to avoid stopping heating and/or causing the heating unit 300 to become inactive.

From this point of view, in one embodiment, it is preferable that the conductor portion 400 is provided at least in the central region 111 of the solid-state battery 100 in plan view (see FIGS. 10 and 11). Note that, from the viewpoint of suitable heat transfer of the heat of the heating unit 300 to the solid-state battery 100 via the conductor part 400, the conductor part 400 is located in the central region 111 and the central region of the solid-state battery 100 in a plan view of the solid-state battery 100. It is preferable that a total of 2 or more and 10 or less, for example, 5, are provided in the peripheral area 112 located around 111 (see FIGS. 10 and 11).

In one aspect, it is preferable that the conductor portion 400X has an inverted tapered shape in cross-sectional view (see FIG. 12). According to this shape, the size of the opposing surface 41X of the conductor portion 400X that faces the solid battery 100 can be made larger than in the case where the conductor portion 400X does not have an inverted tapered shape. This allows suitable heat transfer of the heat of the heating section 300 to the solid battery 100 via the conductor section 400X.

[Method for manufacturing solid battery module]
Hereinafter, a method for manufacturing a solid state battery module, which is an object of the present invention, will be explained. The solid-state battery module that is the object of the present invention is a process of preparing a solid-state battery including battery constituent units having a positive electrode layer, a negative electrode layer, and a solid electrolyte between these electrodes, and then modularizing the solid-state battery. It can be obtained by going through.

The production of the solid-state battery of the present invention can be broadly divided into the production of the solid-state battery itself (hereinafter also referred to as "pre-module battery"), which corresponds to the preliminary stage of modularization, preparation of the substrate, and modularization. .

≪Production method of module front battery≫
The pre-module battery can be manufactured by a printing method such as a screen printing method, a green sheet method using a green sheet, or a combination thereof. In other words, the pre-module battery itself may be manufactured according to a conventional manufacturing method for solid-state batteries (therefore, the solid electrolyte, organic binder, solvent, optional additives, positive electrode active material, negative electrode active material, etc. described below), etc. The raw materials used in the production of known solid-state batteries may be used).

In the following, one manufacturing method will be illustrated and explained for a better understanding of the present invention, but the present invention is not limited to this method. Further, the following chronological matters such as the order of description are merely for convenience of explanation, and are not necessarily restricted thereto.

(Laminated block formation)
- Prepare a slurry by mixing the solid electrolyte, organic binder, solvent, and optional additives. Next, a sheet containing a solid electrolyte is formed from the prepared slurry by firing.
-Create a positive electrode paste by mixing the positive electrode active material, solid electrolyte, conductive material, organic binder, solvent, and optional additives. Similarly, a negative electrode paste is prepared by mixing the negative electrode active material, solid electrolyte, conductive material, organic binder, solvent, and optional additives.
- Print a positive electrode paste on the sheet, and also print a current collecting layer and/or a negative layer as necessary. Similarly, a negative electrode paste is printed on the sheet, and if necessary, a current collecting layer and/or a negative layer are printed.
- Obtain a laminate by alternately stacking sheets printed with positive electrode paste and sheets printed with negative electrode paste. Note that the outermost layer (the uppermost layer and/or the lowermost layer) of the laminate may be an electrolyte layer, an insulating layer, or an electrode layer.

(Battery firing body formation)
After the laminate is crimped and integrated, it is cut into a predetermined size. The obtained cut laminate is subjected to degreasing and firing. Thereby, a fired laminate is obtained. Note that the laminate may be degreased and fired before cutting, and then the laminate may be cut.

(End face electrode formation)
The end electrode on the positive electrode side can be formed by applying a conductive paste to the exposed side surface of the positive electrode in the fired laminate. Similarly, the end electrode on the negative electrode side can be formed by applying a conductive paste to the exposed side surface of the negative electrode in the fired laminate. The end face electrodes on the positive electrode side and the negative electrode side may be provided so as to extend to the main surface of the fired laminate. The component of the end electrode may be selected from at least one selected from silver, gold, platinum, aluminum, copper, tin, and nickel. Note that antimony, bismuth, indium, zinc, aluminum, etc., which form an alloy with tin, may be included.

Note that the end electrodes on the positive electrode side and the negative electrode side are not limited to being formed after firing the laminate, but may be formed before firing and subjected to simultaneous firing.

By going through the above steps, a desired pre-module battery (corresponding to the solid battery 100) can be obtained.

≪Preparation of substrate≫
In this step, the substrate is prepared.

Although not particularly limited, when a resin substrate is used as the substrate, it may be prepared by laminating a plurality of layers and subjecting them to heating and pressure treatment. For example, a substrate precursor is formed using a resin sheet made by impregnating a fiber cloth serving as a base material with a resin raw material. After forming the substrate precursor, the substrate precursor is heated and pressurized using a press. On the other hand, when a ceramic substrate is used as a substrate, its preparation is, for example, by thermocompression bonding a plurality of green sheets to form a green sheet laminate, and by subjecting the green sheet laminate to firing to obtain a ceramic substrate. I can do it. The ceramic substrate can be prepared, for example, in accordance with the preparation of an LTCC substrate. A semirac substrate may have vias and/or lands. In such cases, for example, holes may be formed in the green sheet using a punch press or carbon dioxide laser, and the holes may be filled with conductive paste material, or a printing method using conductive paste material or solder may be used. Precursors of conductive parts such as vias and lands may be formed by this method. Note that the lands and the like can also be formed after the green sheet laminate is fired.

Thereafter, a plurality of wiring lines 220 are formed at predetermined intervals on the first main surface 210 of the substrate 200 for electrical connection (see FIG. 13A). Through the above steps, a desired substrate 200 can be obtained.

≪Placement of electronic parts, etc.≫
Next, at least electronic components such as the conductor section 400, the heating section 300, and the joining member 950 (that is, equivalent to a metal pin for an electrode) are placed on the wiring 220 located at a predetermined location. In addition, it is preferable to place the low thermal conductivity section 600 so that the heating section 300 is sandwiched between the low thermal conductivity section 600 and the conductor section 400 (see FIG. 13B). Regarding the bonding member 950, solder or conductive paste (for example, Ag conductive paste) is applied to the wiring 220 of the substrate, and a precursor 950' of the bonding member responsible for the electrical connection between the solid battery 100 and the substrate 200 is formed. It may be set in advance. In addition to solder and Ag conductive paste, it can be provided by printing a conductive paste that does not require cleaning with flux or the like after formation, such as nanopaste, alloy paste, brazing material, etc. After disposing the solid battery 100 on the substrate so that the end electrode of the solid battery and the precursor 950' of the bonding member are in contact with each other, heat treatment is performed to form a gap between the solid battery 100 and the substrate 200 from the precursor 950'. A joining member 950 that contributes to electrical connection is formed.

≪Modularization≫
Next, modularization is performed using the battery, substrate, etc. obtained above (see FIG. 13C).

First, the pre-module battery 100 is placed on the substrate 200 on which electronic components are placed on the first main surface 210. That is, a "non-modular solid-state battery" is placed on the substrate (hereinafter, the battery used for modularization is also simply referred to as a "solid-state battery").

Specifically, the solid state battery 100 is connected so that the wiring 220 and the end electrode 120 of the solid state battery are electrically connected to each other, and the heating part 300 and the solid state battery 100 can be thermally coupled via the conductor part 400. is placed on the substrate 200. For example, the solid battery 100 can be placed on the substrate 200 so that the battery element 110 and the conductor part 400/heating part 300, etc., face each other. At this time, for example, a conductive paste (for example, Ag conductive paste), solder, or the like may be applied to the upper surface of the conductor portion 400 and the like before placing the solid battery.

Also, at this time, a covering portion 500 is formed. The covering portion 500 preferably includes at least an insulating covering layer and further includes an inorganic covering layer (see FIG. 13D).

First, a covering insulating layer is formed so as to cover the solid state battery 100 on the substrate 200. Therefore, the raw material for the covering insulating layer is provided so that the solid state battery on the substrate is completely covered. When the insulating cover layer is made of a resin material, the insulating cover layer is formed by providing a resin precursor on the substrate and subjecting it to curing. In a preferred embodiment, the covering insulating layer may be formed by applying pressure with a mold. By way of example only, the overlying insulating layer encapsulating the solid state battery on the substrate may be formed through compression molding. As long as the resin material is generally used in molds, the raw material for the insulating coating layer may be in the form of granules, and may be thermoplastic. Note that such molding is not limited to mold molding, and may be performed through polishing, laser processing, and/or chemical treatment.

Note that for the covering portion 500, a part of the covering portion 500 may be formed first by applying and curing a resin to cover the electronic component-attached substrate before placing the solid battery 100 thereon. Thereafter, the top surface (corresponding to the above-mentioned opposing surface) of the conductor section 400 may be located. In this case, after indexing, the hardened resin and the upper surface of the conductor section 400 may be covered with a conductive paste or solder. Thereafter, after the solid state battery 100 is placed, the remaining portion of the insulating cover layer may be formed so as to cover the solid state battery 100.

Note that preferably, after the formation of the covering insulating layer, the covering inorganic layer is formed. Specifically, a covering inorganic layer is formed on "a covering precursor in which each solid-state battery 100 is covered with a covering insulating layer on a substrate 200". For example, dry plating may be performed to form a dry plating film as the covering inorganic layer. More specifically, dry plating is performed to form a coating inorganic layer on exposed surfaces other than the bottom surface of the coating precursor (that is, other than the bottom surface of the supporting substrate).

By going through the steps described above, it is possible to obtain a module product in which the solid-state battery on the substrate is covered with the covering part. In other words, the "solid battery module" according to the present invention can finally be obtained.

Although the embodiments of the present invention have been described above, these are merely typical examples. Those skilled in the art will readily understand that the present invention is not limited thereto, and that various embodiments can be considered without changing the gist of the present invention.

Note that the present invention may include the following aspects.
<1>
A solid battery including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer, a conductor part, a heating part, and a substrate,
the solid state battery is disposed on the substrate,
A solid-state battery module, wherein the heating section and the solid-state battery can be thermally coupled via the conductor section.
<2>
The solid-state battery module according to <1>, wherein the conductor part and the heating part are provided between the solid-state battery and the substrate.
<3>
The solid state battery module according to <1> or <2>, wherein the conductor part is provided between the heating part and the solid state battery.
<4>
The solid battery module according to any one of <1> to <3>, wherein the conductor portion is adjacent to and/or directly in contact with the heating portion.
<5>
Any one of <1> to <4>, wherein the minimum distance between the opposing surface of the conductor portion facing the solid battery and the solid battery is smaller than the minimum distance between the solid battery and the substrate. The solid state battery module described in .
<6>
The minimum distance between the opposing surface of the conductor portion facing the solid battery and the solid battery is 0% or more and 50% or less of the minimum distance between the solid battery and the substrate, <1> to The solid battery module according to any one of <5>.
<7>
<1> to <6, further including a low thermal conductivity part having a thermal conductivity relatively lower than that of the conductor part, and the heating part is provided between the low thermal conductivity part and the conductor part. ＞The solid battery module according to any one of ＞.
<8>
The solid-state battery module according to any one of <1> to <7>, which has a conductive adhesive layer between the conductor portion and the solid-state battery.
<9>
The solid-state battery module according to <8>, wherein the conductive adhesive layer is in contact with the conductor portion and the solid-state battery.
<10>
The solid battery module according to <8> or <9>, wherein the width of the conductive adhesive layer is larger than the width of the opposing surface of the conductor part.
<11>
The device according to any one of <1> to <10>, further including a second conductor portion that partially surrounds the solid battery, and the second conductor portion is provided so as to face the conductor portion in cross-sectional view. solid state battery module.
<12>
The solid-state battery module according to any one of <1> to <11>, wherein the conductor portion is provided at least in a central region of the solid-state battery in plan view.
<13>
The solid-state battery module according to <12>, wherein two or more conductor parts are provided in a central region of the solid-state battery and a peripheral region located around the central region in a plan view.
<14>
The solid battery module according to any one of <1> to <13>, wherein the conductor portion has an inverted tapered shape when viewed in cross section.
<15>
The solid battery module according to any one of <1> to <14>, wherein the heating section is a PTC heater.
<16>
The solid battery module according to any one of <1> to <15>, wherein the conductor portion is a metal pin.
<17>
The solid battery module according to any one of <8> to <16> that is subordinate to <7>, wherein the low thermal conductivity part is a chip fuse.
<18>
further comprising a temperature detection device capable of detecting the temperature of the solid-state battery,
The solid-state battery module according to any one of <1> to <17>, wherein the temperature sensing device is provided between the solid-state battery and the substrate.
<19>
The solid state battery module according to <18>, wherein the temperature sensing device is disposed adjacent to a joining member responsible for electrical connection between the end electrode of the solid state battery and the substrate.
<20>
The solid-state battery module according to any one of <1> to <19>, further comprising a covering part surrounding the solid-state battery, and the covering part includes a covering insulating layer.
<21>
The solid battery module according to any one of <1> to <20>, wherein the substrate is a resin substrate.

The solid state battery module according to one embodiment of the present invention can be used in various fields where battery use or power storage is expected. Although this is just an example, the solid state battery module of the present invention can be used in the electrical, information, and communication fields where mobile devices are used (e.g., mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, electronic paper, RFID tags, card-type electronic money, small electronic devices such as smart watches, electrical/electronic equipment field or mobile equipment field), home/small industrial applications (e.g., power tools, golf carts, household/electronic equipment field), nursing care/industrial robots), large industrial applications (e.g. forklifts, elevators, harbor cranes), transportation systems (e.g. hybrid cars, electric cars, buses, trains, electrically assisted bicycles, electric motorcycles, etc.) ), power system applications (e.g., various power generation, road conditioners, smart grids, home-installed electricity storage systems, etc.), medical applications (medical equipment such as earphones and hearing aids), and pharmaceutical applications (medication management systems, etc.) ), as well as the IoT field, space and deep sea applications (for example, in the fields of space probes, underwater research vessels, etc.).

Cross-reference of related applications

This application claims priority under the Paris Convention based on Japanese Patent Application No. 2022-038379 (filing date: March 11, 2022, title of invention: "Solid Battery Module"). All content disclosed in that application is hereby incorporated by reference.

DESCRIPTION OF SYMBOLS 100 Solid-state battery 100A Main surface of solid-state battery 100B Side surface of solid-state battery 110 Battery element 111 Central region of solid-state battery 112 Surrounding region located around the central region of solid-state battery 120 End surface electrode 121 Positive electrode end surface electrode 122 Negative electrode end surface 200 Substrate 210 First main surface of the board 220 Wiring 230 Second main surface of the board opposite to the first main surface 300 Heating section 400, 400D, 400X Conductor section 410, 410X Opposing surface of the conductor section facing the solid battery 500 , 500F Covering portion 510, 510F Covering insulating layer 520 Covering inorganic layer 600 Low thermal conductivity portion 700 Conductive adhesive layer 710 One side of the conductive adhesive layer 720 Other side of the conductive adhesive layer 800 Conductive adhesive layer 850 Second conductor Part 900 Temperature sensing device 950 Bonding member 950' Precursor of bonding member 1000, 1000A to 1000H Solid state battery module D1 Minimum distance between the facing surface of the conductor part and the solid battery D2 Minimum distance between the solid battery and the substrate

Claims (21)

1. A solid battery including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer, a conductor part, a heating part, and a substrate,
   the solid state battery is disposed on the substrate,
   A solid-state battery module, wherein the heating section and the solid-state battery can be thermally coupled via the conductor section.
2. The solid state battery module according to claim 1, wherein the conductor part and the heating part are provided between the solid state battery and the substrate.
3. The solid state battery module according to claim 1 or 2, wherein the conductor part is provided between the heating part and the solid state battery.
4. The solid state battery module according to any one of claims 1 to 3, wherein the conductor portion is adjacent to and/or in direct contact with the heating portion.
5. According to any one of claims 1 to 4, the minimum distance between the opposing surface of the conductor section facing the solid battery and the solid battery is smaller than the minimum distance between the solid battery and the substrate. solid state battery module.
6. The minimum distance between the opposing surface of the conductor portion facing the solid battery and the solid battery is 0% or more and 50% or less of the minimum distance between the solid battery and the substrate. 5. The solid battery module according to any one of 5.
7. Claims 1 to 6, further comprising a low thermal conductivity part having a thermal conductivity relatively lower than that of the conductor part, and the heating part is provided between the low thermal conductivity part and the conductor part. The solid battery module according to any one of the above.
8. The solid state battery module according to any one of claims 1 to 7, further comprising a conductive adhesive layer between the conductor portion and the solid state battery.
9. The solid state battery module according to claim 8, wherein the conductive adhesive layer is in contact with the conductor portion and the solid state battery.
10. The solid state battery module according to claim 8 or 9, wherein the width of the conductive adhesive layer is larger than the width of the opposing surface of the conductor portion.
11. The solid state according to any one of claims 1 to 10, further comprising a second conductor part that partially surrounds the solid state battery, and the second conductor part is provided so as to face the conductor part in a cross-sectional view. battery module.
12. The solid state battery module according to any one of claims 1 to 11, wherein the conductor portion is provided at least in a central region of the solid state battery in plan view.
13. The solid state battery module according to claim 12, wherein, in plan view, two or more conductor parts are provided in a central region of the solid state battery and a peripheral region located around the central region.
14. The solid state battery module according to any one of claims 1 to 13, wherein the conductor portion has an inverted tapered shape when viewed in cross section.
15. The solid state battery module according to any one of claims 1 to 14, wherein the heating section is a PTC heater.
16. The solid state battery module according to any one of claims 1 to 15, wherein the conductor portion is a metal pin.
17. The solid state battery module according to any one of claims 8 to 16 depending on claim 7, wherein the low thermal conductivity part is a chip fuse.
18. further comprising a temperature detection device capable of detecting the temperature of the solid-state battery,
    The solid state battery module according to any one of claims 1 to 17, wherein the temperature sensing device is provided between the solid state battery and the substrate.
19. The solid state battery module according to claim 18, wherein the temperature sensing device is arranged adjacent to a joining member that is responsible for electrically connecting the end electrode of the solid state battery and the substrate.
20. The solid state battery module according to any one of claims 1 to 19, further comprising a covering part surrounding the solid state battery, and the covering part includes an insulating covering layer.
21. The solid state battery module according to any one of claims 1 to 20, wherein the substrate is a resin substrate.

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