Solid-state battery, method for manufacturing same, and battery module

Abstract

The invention relates to a solid-state battery, a method for manufacturing the same, and a battery module. Provided is a solid-state battery capable of effectively dissipating heat generated in an electrode laminate. An electrode laminate (110) of a solid-state battery (10) according to the present disclosure has a first current collector layer (111), a first electrode active material layer (112), a solid electrolyte layer (113), a second electrode active material layer (114), and a second current collector layer (115) in this order, an insulating member (120) is disposed on at least a portion of an end surface of the electrode laminate, and the second current collector layer is in contact with the insulating member. The method for manufacturing a solid-state battery according to the present disclosure comprises the steps of: forming a preliminary laminate; applying an insulating member to at least a portion of an end surface of the preliminary laminate; forming an electrode laminate by laminating a second current collector layer on the preliminary laminate after applying the insulating member; and bringing the second current collector layer into contact with the insulating member.

Description

Technical Field

[0001] The present disclosure relates to a solid battery, a method for manufacturing the same, and a battery module. Background Art

[0002] In the automotive industry, increasing awareness of environmental issues has led to the development of electric and hybrid vehicles, resulting in a growing demand for high-voltage secondary batteries. Meanwhile, in the field of portable electronic devices, as they become more prevalent and widespread, there is a growing demand for high-capacity secondary batteries that are compact, lightweight, and capable of long-term continuous operation.

[0003] As a high-voltage and high-capacity battery, for example, a battery including an electrode stack having a negative electrode current collector layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer in this order is known.

[0004] In such batteries, for example, when the current collector layer of one electrode extends from the electrode stack, it may come into contact with the current collector layer and / or active material layer of the other electrode, causing a short circuit. Furthermore, the portion of the current collector layer that extends from the electrode stack is also called a collector tab. This short circuit is particularly likely to occur when the area of ​​the current collector layer of one electrode is larger than that of the other electrode. Therefore, technologies are being developed to prevent such short circuits.

[0005] For example, Patent Document 1 discloses a method for manufacturing a stacked all-solid-state battery, which includes: preparing a first stack in which a solid electrolyte layer, a first active material layer (electrode active material layer), a first collector layer having a first collector sheet extending from the side of the stacked all-solid-state battery, a first active material layer and a solid electrolyte layer are stacked in sequence; applying an insulator coating liquid on the end of the first stack to form an insulating portion (insulating component); stacking the first stack forming the insulating portion, the second active material layer, and the second collector layer having a second collector sheet extending from the side of the stacked all-solid-state battery, preparing a battery structure (electrode stack) having a plurality of second stacks in which a second collector layer having a second collector sheet, a second active material layer, a solid electrolyte layer, a first active material layer, a first collector layer having a first collector sheet, a first active material layer, a solid electrolyte layer and a second active material layer are stacked in sequence; and joining a plurality of second collector sheets extending from the plurality of second collectors of the battery structure.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-049696 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In batteries including electrode stacks, the electrode stacks sometimes generate heat during charge and discharge, and in particular, the current collector layer in the electrode stacks tends to reach high temperatures. This heat can sometimes reduce battery performance, and therefore it is desirable to effectively dissipate the heat generated in the electrode stacks.

[0011] An object of the present disclosure is to provide a solid battery capable of efficiently dissipating heat generated in an electrode stack, a method for manufacturing the same, and a battery module including such a solid battery.

[0012] Means for solving problems

[0013] The inventors of the present application have discovered that the above-mentioned problems can be solved by the following means.

[0014] <Scheme 1>

[0015] A solid battery is a solid battery having an electrode stack, wherein the electrode stack has a first collector layer, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second collector layer in sequence, an insulating member is arranged on at least a portion of the end face of the electrode stack, the second collector layer extends from the end face of the electrode stack on which the insulating member is arranged, and the second collector layer contacts the insulating member.

[0016] Option 2

[0017] A solid battery according to Option 1, wherein the electrode stack has the first electrode active material layer, the solid electrolyte layer, the second electrode active material layer, and the second collector layer in sequence on both sides of the first collector layer, and one of the second collector layers is in contact with the insulating member.

[0018] <Scheme 3>

[0019] The solid battery according to Option 2, wherein the insulating member is arranged on the end surface of the electrode stack from one second electrode active material layer to another second electrode active material layer, and the second collector layer is in contact with the insulating member for more than 50% of the surface area of ​​the insulating member.

[0020] <Scheme 4>

[0021] The solid battery according to any one of aspects 1 to 3, wherein the insulating member comprises a thermoplastic resin.

[0022] <Scheme 5>

[0023] The solid battery according to any one of aspects 1 to 3, wherein the insulating member includes a mixture of a resin and an insulating filler, and the thermal conductivity of the insulating filler is greater than the thermal conductivity of the resin.

[0024] <Scheme 6>

[0025] The solid battery according to claim 5, wherein the insulating filler is a metal oxide.

[0026] <Scheme 7>

[0027] The solid battery according to any one of options 1 to 6, wherein the first current collector layer is a negative electrode current collector layer, the first electrode active material layer is a negative electrode active material layer, the second electrode active material layer is a positive electrode active material layer, and the second current collector layer is a positive electrode current collector layer.

[0028] <Scheme 8>

[0029] A battery module comprising the solid state battery according to any one of aspects 1 to 7.

[0030] <Scheme 9>

[0031] A method for manufacturing a solid battery according to any one of schemes 1 to 7, comprising the following steps: (a) stacking the first collector layer, the first electrode active material layer, the solid electrolyte layer, and the second electrode active material layer in sequence to form a preliminary stack; (b) applying the insulating component to at least a portion of the end surface of the preliminary stack; (c) after applying the insulating component, stacking the second collector layer on the second electrode active material layer in the preliminary stack to form the electrode stack; and (d) bringing the second collector layer into contact with the insulating component.

[0032] <Scheme 10>

[0033] The method according to claim 9, wherein the insulating member comprises a thermoplastic resin, and in the step (d), the insulating member is pressed and bonded while the second current collector layer is heated.

[0034] <Scheme 11>

[0035] A solid battery is a solid battery having an electrode stack, wherein the electrode stack has a first collector layer, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second collector layer in sequence, and an insulating member is arranged on at least a portion of the end surface of the electrode stack, the insulating member contains a mixture of a resin and an insulating filler, and the thermal conductivity of the insulating filler is greater than the thermal conductivity of the resin.

[0036] Effects of the Invention

[0037] According to the present disclosure, a solid battery capable of efficiently dissipating heat generated in an electrode stack, a method for manufacturing the same, and a battery module including the solid battery can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic plan view showing an example of the solid state battery of the present disclosure.

[0039] Figure 2 This is a schematic cross-sectional view showing an example of the arrangement of insulating members in the solid battery of the present disclosure.

[0040] Figure 3 This is a schematic cross-sectional view showing an example of an embodiment in which the insulating member includes a mixture of a resin and an insulating filler in the solid battery of the present disclosure.

[0041] Figure 4 This is a schematic perspective view showing an example of a battery module of the present disclosure.

[0042] Description of Reference Signs

[0043] 1 battery module

[0044] 10 Solid-state batteries

[0045] 110 electrode stack

[0046] 111 First current collector layer

[0047] 112 first electrode active material layer

[0048] 113 Solid Electrolyte Layer

[0049] 114 Second electrode active material layer

[0050] 115 Second current collector layer

[0051] 120 Insulation components

[0052] 130 Laminated Film

[0053] 140 collector terminal DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present disclosure in detail with reference to the accompanying drawings. Furthermore, the present disclosure is not limited to the following embodiments and can be implemented in various modifications within the scope of the disclosed subject matter. Furthermore, the dimensional relationships in the accompanying drawings do not reflect the actual dimensional relationships.

[0055] Solid-State Battery

[0056] like Figure 1As shown in FIG, the solid battery 10 of the present disclosure includes an electrode stack 110. Figure 2 As shown in the example, the electrode stack 110 includes a first current collector layer 111, a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second current collector layer 115 in this order. An insulating member 120 is disposed on at least a portion of the end face of the electrode stack 110. The second current collector layer 115 extends from the end face of the electrode stack 110 on which the insulating member 120 is disposed, and the second current collector layer 115 is in contact with the end face of the insulating member 120. Figure 2 This is a schematic cross-sectional view showing an enlarged portion of the insulating member 120 of the solid battery 10 of the present disclosure.

[0057] As described above, in batteries including an electrode stack, the electrode stack sometimes generates heat during charge and discharge, and the current collector layer in the electrode stack is particularly susceptible to high temperatures. The inventors of the present application have discovered that by contacting the second current collector layer extending from the end surface of the electrode stack with an insulating member, heat generated in the electrode stack can be dissipated more efficiently than in a case where the electrode stack and the second current collector layer extending from the end surface of the electrode stack are separated by, for example, air.

[0058] Furthermore, when an insulating member is formed on the end face of the electrode stack, the collector tabs separate from the electrode stack and join together in the area corresponding to the insulating member, resulting in a reduction in the volumetric efficiency of the battery. The inventors of this application have discovered that by bringing the second collector layer extending from the end face of the electrode stack into contact with the insulating member, the location where the collector tabs join together can be brought closer to the electrode stack, thereby improving the volumetric efficiency of the battery.

[0059] In the present disclosure, in particular, the second current collector layer can be bonded to the insulating member. This configuration facilitates close contact between the second current collector layer and the insulating member, thereby more effectively dissipating heat generated in the electrode stack. In the present disclosure, bonding includes bonding using an adhesive, bonding using tape and an adhesive material, and thermal welding.

[0060] like Figure 2As illustrated in FIG, in an electrode stack 110 having a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second current collector layer 115, in this order, on both sides of a first current collector layer 111, an insulating member 120 can be disposed on the end faces of the electrode stack 110, from one second electrode active material layer 114 to the other, and the second current collector layer 115 can be in contact with the insulating member 120 for at least 50% of the surface area of ​​the insulating member 120. This configuration effectively prevents short circuits caused by contact between the second current collector layer 115 and the first current collector layer 111 and the first electrode active material layer 112, and more efficiently dissipates heat generated in the electrode stack. Furthermore, the volumetric efficiency of the battery can be further improved. In this case, at least a portion of the contact between the second current collector layer 115 and the insulating member 120 can be bonded, and in particular, the entire contact between the second current collector layer 115 and the insulating member 120 can be bonded.

[0061] In the present disclosure, a "solid-state battery" refers to a battery that uses at least a solid electrolyte as its electrolyte. Thus, a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as its electrolyte. Furthermore, the solid-state battery of the present disclosure may be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as its electrolyte.

[0062] The solid battery of the present disclosure may be a lithium ion secondary battery. As the purpose of the battery, for example, a power source for vehicles such as hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), electric vehicles (BEV), gasoline vehicles, and diesel vehicles can be listed. It is particularly preferably used as a driving power source for hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), or electric vehicles (BEV). In addition, the battery in the present disclosure can be used as a power source for mobile bodies (such as railways, ships, and aircraft) other than vehicles, and can also be used as a power source for electrical products such as information processing devices.

[0063] The elements constituting the solid state battery of the present disclosure are described below.

[0064] <Electrode stack>

[0065] The solid battery 10 of the present disclosure includes an electrode stack 110. The electrode stack functions as a power generation element of the battery.

[0066] The electrode stack 110 includes a first current collector layer 111, a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second current collector layer 115 in this order. Figure 2As shown in the example, the electrode stack 110 may have a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second collector layer 115 on both sides of the first collector layer 111 in sequence, that is, the electrode stack 110 may have a second collector layer 115, a second electrode active material layer 114, a solid electrolyte layer 113, a first electrode active material layer 112, a first collector layer 111, a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second collector layer 115 in sequence, and one second collector layer 115 may be in contact with the end face of the insulating member 120. Furthermore, in Figure 2 In the embodiment, a scheme is illustrated in which two electrode stacks having a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second collector layer 115 are stacked in sequence on both sides of a first collector layer 111, but the number of electrode stacks in the solid battery disclosed in the present invention is not limited to this.

[0067] The first current collector layer may be a negative electrode current collector layer, the first electrode active material layer may be a negative electrode active material layer, the second electrode active material layer may be a positive electrode active material layer, and the second current collector layer may be a positive electrode current collector layer. That is, the electrode stack may include, in this order, a negative electrode current collector layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer.

[0068] The shape of the electrode stack is not particularly limited, and for example, it may have a top portion, a bottom portion opposite to the top portion, and four side portions connecting the top portion and the bottom portion. The shape of the top portion is not particularly limited, and for example, quadrilaterals such as squares, rectangles, rhombuses, trapezoids, and parallelograms can be listed. In addition, the shape of the top portion may be a polygon other than a quadrilateral, or a shape with a curve such as a circle. The shape of the bottom portion may be the same as that of the top portion. The shape of the side portions is not particularly limited, and for example, quadrilaterals such as squares, rectangles, rhombuses, trapezoids, and parallelograms can be listed.

[0069] The size of the electrode stack is not particularly limited and can be appropriately designed according to, for example, required battery characteristics and the like.

[0070] Hereinafter, each member that can constitute the electrode stack according to the present disclosure will be described.

[0071] To facilitate understanding of the present disclosure, each member related to an electrode stack of a solid lithium ion secondary battery is described as an example. However, the solid battery of the present disclosure is not limited to a lithium ion secondary battery.

[0072] (Positive electrode current collector layer)

[0073] The conductive material used for the positive electrode current collector layer is not particularly limited, and examples thereof include SUS, aluminum, copper, nickel, iron, titanium, and carbon.

[0074] The shape of the positive electrode current collector layer is not particularly limited, and examples thereof include foil, plate, and mesh. Among these, foil is preferred.

[0075] The positive electrode current collector layer may extend from the end surface of the electrode stack, and a plurality of positive electrode current collector layers may be joined at the extended portion.

[0076] (Positive Electrode Active Material Layer)

[0077] The positive electrode active material layer contains at least a positive electrode active material and preferably further contains a solid electrolyte described below. In addition, depending on the application and purpose of use, for example, an additive for the positive electrode active material layer of a solid battery, such as a conductive additive or a binder, may be contained.

[0078] There is no particular limitation on the material of the positive electrode active material. For example, the positive electrode active material may be lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganese oxide (LiMn2O4), Li 1.5 Co 1 / 3 Ni 1 / 3 Mn 1 / 3 O2、LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 O2, by Li 1+x Mn 2-x-y M y A heterogeneous element-substituted Li-Mn spinel having a composition represented by O4 (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni and Zn) or the like.

[0079] The conductive additive is not particularly limited, and may be, for example, a carbon material such as VGCF (Vapor Grown Carbon Fiber) or carbon nanofiber, or a metal material.

[0080] The binder is not particularly limited, and may be, for example, polyvinylidene fluoride (PVdF), carboxymethyl cellulose (CMC), butadiene rubber (BR), styrene butadiene rubber (SBR), or a combination thereof.

[0081] (Solid electrolyte layer)

[0082] The solid electrolyte layer contains at least a solid electrolyte. The solid electrolyte is not particularly limited, and any material that can be used as a solid electrolyte for solid batteries can be used. For example, the solid electrolyte can be a sulfide solid electrolyte, an oxide solid electrolyte, or a polymer electrolyte.

[0083] Examples of sulfide solid electrolytes include sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, and argyrodite-type solid electrolytes, but are not limited thereto. Specific examples of sulfide solid electrolytes include Li2S-P2S5 (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2 (Li 13 GeP3S 16 、Li 10 GeP2S 12 etc.), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x PS 6-x Cl x etc.; or combinations thereof, but not limited thereto.

[0084] Examples of oxide solid electrolytes include Li7La3Zr2O 12、 Li 7-x La3Zr 1-x Nb x O 12、 Li 7- 3x La3Zr2Al x O 12 、Li 3x La 2 / 3-x TiO3、Li 1+x Al x Ti 2-x (PO4)3、Li 1+x Al x Ge 2-x (PO4)3, Li3PO4, Li 3+x PO 4-x N x (LiPON), etc., but not limited to these.

[0085] Examples of the polymer electrolyte include polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof, but the polymer electrolyte is not limited thereto.

[0086] The solid electrolyte may be glass or crystallized glass (glass ceramic). In addition, the solid electrolyte layer may contain a conductive additive, a binder, etc. as needed in addition to the above-mentioned solid electrolyte. For the conductive additive and the binder, reference can be made to the description related to the positive electrode active material layer.

[0087] (Negative Electrode Active Material Layer)

[0088] The negative electrode active material layer contains at least a negative electrode active material and preferably further contains the above-mentioned solid electrolyte. In addition, depending on the application and purpose of use, for example, a conductive additive, a binder, and other additives used in the negative electrode active material layer of a solid battery may be contained.

[0089] The material of the negative electrode active material is not particularly limited, but is preferably capable of occluding and releasing metal ions such as lithium ions. For example, the negative electrode active material may be an oxide-based negative electrode active material, an alloy-based negative electrode active material, or a carbon material, but is not limited thereto.

[0090] The oxide-based negative electrode active material is not particularly limited, and examples thereof include lithium titanate (LTO) particles.

[0091] There are no particular limitations on the alloy-based negative electrode active material, and examples thereof include Si alloy-based negative electrode active materials and Sn alloy-based negative electrode active materials. Examples of Si alloy-based negative electrode active materials include silicon, silicon oxide, silicon carbide, silicon nitride, or solid solutions thereof. In addition, Si alloy-based negative electrode active materials may contain elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, Ti, etc. In addition, Sn alloy-based negative electrode active materials may contain elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, etc. In addition, Sn alloy-based negative electrode active materials may contain elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, etc.

[0092] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, and graphite.

[0093] For the solid electrolyte used in the negative electrode active material layer, reference can be made to the above description regarding the solid electrolyte layer. For the conductive additive and the binder, reference can be made to the above description regarding the positive electrode active material layer.

[0094] (Negative electrode current collector layer)

[0095] The conductive material used for the negative electrode current collector layer is not particularly limited, and examples thereof include SUS, aluminum, copper, nickel, iron, titanium, carbon, etc., but are not limited thereto.

[0096] The shape of the negative electrode current collector layer is not particularly limited, and examples thereof include foil, plate, and mesh. Among these, foil is preferred.

[0097] The negative electrode current collector layer may extend from the end surface of the electrode stack, and a plurality of negative electrode current collector layers may be joined at the extended portion.

[0098] <Insulation components>

[0099] In the solid battery 10 of the present disclosure, the insulating member 120 is disposed on at least a portion of the end surface of the electrode stack 110 .

[0100] The insulating member 120 may contain a thermoplastic resin or may be a thermoplastic resin. This configuration facilitates adhesion of the second current collector layer 115 to the insulating member 120. Specifically, as described later, the second current collector layer 115 can be pressed against the insulating member 120 while being heated, thereby achieving adhesion.

[0101] Thermoplastic resins are not particularly limited and may be either non-reactive or reactive. Non-reactive thermoplastic resins are not particularly limited and include, for example, ethylene vinyl acetate (EVA), synthetic rubber, olefin, polyamide, or polyester resins such as polyethylene terephthalate (PET). Reactive resins are not particularly limited and include, for example, urethane resins.

[0102] The insulating member 120 may contain a curable resin or may be a curable resin. The curable resin may have adhesive properties after curing. By using such a curable resin, the second current collector layer 115 can be easily bonded to the insulating member 120.

[0103] The curable resin is not particularly limited, and examples thereof include thermosetting resins and photocurable resins. Examples of these resins include acrylic and epoxy resins.

[0104] By using these resins as the insulating member 120 , it is easy to arrange the insulating member 120 on the end surface of the electrode stack 110 .

[0105] The insulating member 120 may be an insulating tape. The insulating tape may be a double-sided tape. By using such an insulating tape, the second current collector layer 115 can be easily bonded to the insulating member 120 .

[0106] By using an insulating tape as the insulating member 120 , the space occupied by the insulating member 120 is reduced, thereby further improving the volume efficiency of the battery.

[0107] like Figure 3 As shown in the example, the insulating member 120 may include a mixture of a resin 121 and an insulating filler 121, and the thermal conductivity of the insulating filler may be greater than that of the resin. 8Ω·cm or more. By including the insulating filler 121 in the insulating member 120, the heat generated in the electrode stack 110 can be dissipated more effectively to the outside of the battery. Figure 3 This is a schematic cross-sectional view of an enlarged portion of the insulating member 120 of the solid battery 10 of the present disclosure. Figure 3 In the embodiment, a scheme is illustrated in which two electrode stacks each having a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second collector layer 115 are stacked in sequence on both sides of a first collector layer 111, but the number of electrode stacks in the solid battery disclosed in the present invention is not limited to this.

[0108] As described above, the current collector layer in particular is susceptible to high temperatures in the electrode stack 110. Therefore, by disposing the insulating member 120 on the end surface of the electrode stack 110 so as to cover the first current collector layer 111, heat generated in the electrode stack 110 can be dissipated particularly effectively.

[0109] The insulating filler may be a metal oxide. The metal oxide is not particularly limited, and may be, for example, aluminum oxide.

[0110] The shape and size of the insulating member 120 are not particularly limited and can be appropriately designed taking into account the ease of contact with the second current collector layer and the volumetric efficiency of the battery. For example, the length of the insulating member 120 in the stacking direction of the electrode stack 110 can be smaller than the thickness of the electrode stack 110. This configuration prevents the insulating member 120 from hindering the stacking direction of the electrode stack 110 even when a battery module including the solid-state battery 10 of the present disclosure is formed as described later.

[0111] Laminated film

[0112] The solid-state battery 10 of the present disclosure may include a laminate film 130. The laminate film may house an electrode stack. Specifically, the laminate film may be wound around the electrode stack to house the electrode stack. Alternatively, the laminate film may be composed of a first and a second film. In this case, the first and second films may be used to sandwich the electrode stack from above and below in the stacking direction of the electrode stack to house the electrode stack.

[0113] The laminate film may have a sealant resin layer, a metal layer, and a protective resin layer in this order along the thickness direction. Examples of materials for the sealant resin layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of materials for the metal layer include aluminum, aluminum alloys, and stainless steel. Examples of materials for the protective resin layer include polyethylene terephthalate (PET) and nylon.

[0114] There are no particular limitations on the layers comprising the laminate film or the thickness of the laminate film. The thickness of the sealant resin layer is, for example, 40 μm to 100 μm. The thickness of the metal layer is, for example, 30 μm to 60 μm. The thickness of the protective resin layer is, for example, 20 μm to 60 μm. The thickness of the laminate film is, for example, 80 μm to 250 μm.

[0115] (Collector terminal)

[0116] The solid battery 10 of the present disclosure may further include a collector terminal 140. The collector terminal may be electrically connected to the collector portion of the electrode stack. The material of the collector terminal is not particularly limited as long as it has a collector function. Figure 1 As shown in the example, the positive electrode current collecting terminal and the negative electrode current collecting terminal may be arranged on a pair of opposing side surfaces of the electrode stack. The positive electrode current collecting terminal and the negative electrode current collecting terminal may be arranged separately from each other on one side surface of the electrode stack.

[0117] The shape, size, etc. of the current collecting terminal are not particularly limited.

[0118] In the case where the solid battery of the present disclosure has a current collector terminal, the laminate film can accommodate the electrode stack and the current collector terminal together. Specifically, the laminate film can wrap the electrode stack and the current collector terminal around each other to accommodate the electrode stack and the current collector terminal together. Alternatively, the laminate film can be composed of a first film and a second film. In this case, the first film and the second film can be used to sandwich the electrode stack and the current collector terminal from above and below in the stacking direction of the electrode stack, thereby accommodating the electrode stack and the current collector terminal together.

[0119] Manufacturing Methods of Solid-State Batteries

[0120] The method of the present disclosure for manufacturing a solid battery includes the following steps: (a) stacking a first collector layer 111, a first electrode active material layer 112, a solid electrolyte layer 113 and a second electrode active material layer 114 in sequence to form a preliminary stack; (b) applying an insulating member 120 to at least a portion of the end surface of the preliminary stack; (c) after applying the insulating member, stacking a second collector layer 115 on the second electrode active material layer in the preliminary stack to form an electrode stack; and (d) making the second collector layer contact the insulating member.

[0121] By adopting such a method, the solid state battery of the present disclosure with improved volume efficiency can be manufactured.

[0122] <Preliminary laminate formation step>

[0123] The method disclosed herein includes: (a) sequentially stacking a first current collector layer, a first electrode active material layer, a solid electrolyte layer, and a second electrode active material layer to form a preliminary stack.

[0124] It should be noted that in the present disclosure, the so-called "preliminary stack" refers to a stack that includes a first current collector layer, a first electrode active material layer, a solid electrolyte layer, and a second electrode active material layer in this order, and can form an electrode stack by stacking the second current collector layer.

[0125] There is no particular limitation on the method for stacking the layers, and examples thereof include dry forming such as powder pressing and wet forming using a slurry. For example, in the case of wet forming, first, a first electrode composite slurry capable of forming a first electrode active material layer is applied to one side of the first current collector layer and dried, thereby enabling the first electrode active material layer to be stacked on the first current collector layer. A solid electrolyte slurry is used to similarly stack the solid electrolyte layer on the first electrode active material layer. A second electrode composite slurry is used to similarly stack the second electrode active material layer on the solid electrolyte layer.

[0126] 〈Insulation component application process〉

[0127] The method of the present disclosure includes: (b) applying an insulating member to at least a portion of an end surface of the preliminary laminate.

[0128] There are no particular limitations on the method for applying the insulating member to at least a portion of the end face of the preliminary laminate. For example, when the insulating member is a thermoplastic resin, a method may include applying or impregnating molten thermoplastic resin onto at least a portion of the end face of the preliminary laminate, followed by curing. For example, when the insulating member is a curable resin, a method may include applying or impregnating curable resin onto at least a portion of the end face of the preliminary laminate, followed by curing. For example, when the insulating member is an insulating tape, a method may include applying the insulating tape onto at least a portion of the end face of the preliminary laminate.

[0129] <Electrode stack formation step>

[0130] The method disclosed herein includes: (c) after applying an insulating member, laminating a second current collector layer on the second electrode active material layer in the preliminary laminate to form an electrode laminate.

[0131] The method for laminating the second current collector layer on the second electrode active material layer in the preliminary stack to form the electrode stack is not particularly limited. For example, when the second current collector layer is a metal foil, a method of placing the metal foil on the second electrode active material layer in the preliminary stack and pressing the metal foil can be cited.

[0132] Contact process

[0133] The method of the present disclosure includes: (d) bringing the second current collector layer into contact with the insulating member.

[0134] When the insulating member is made of a thermoplastic resin, the second current collector layer can be pressed against the insulating member while being heated in step (d). This allows the second current collector layer to be bonded to the insulating member using a simple method.

[0135] When the insulating member contains a curable resin having adhesive properties after curing, or is an insulating tape having adhesive properties on both sides, the second current collector layer may be pressed against the insulating member to bond the insulating member in step (d).

[0136] In step (a) of the method disclosed herein, the first electrode active material layer, the solid electrolyte layer, and the second electrode active material layer may be sequentially stacked on both sides of the first current collector layer. In this case, in step (c), the second current collector layer may be stacked on both second electrode active material layers to form an electrode stack, and in step (d), one of the second current collector layers may be brought into contact with the insulating member.

[0137] Battery Module

[0138] like Figure 4 As illustrated in FIG, the battery module 1 of the present disclosure includes the solid-state battery 10 of the present disclosure. In particular, as described above, in the solid-state battery of the present disclosure, when the length of the insulating member in the stacking direction of the electrode stack is smaller than the thickness of the electrode stack, the battery module of the present disclosure can prevent the insulating member from becoming an obstacle to constraining the electrode stack in the stacking direction. For the solid-state battery 10 of the present disclosure, reference can be made to the above-mentioned description related to the solid-state battery of the present disclosure.

[0139] There is no particular limitation on the number of solid batteries of the present disclosure in the battery module of the present disclosure, and the number may be at least one. In the battery module of the present disclosure, all batteries may be solid batteries of the present disclosure. Figure 4 , a configuration in which two solid batteries are provided is illustrated, but the number of solid batteries in the battery module of the present disclosure is not limited thereto.

[0140] Solid-State Battery

[0141] like Figure 1 As shown in FIG, the solid battery 10 of the present disclosure includes an electrode stack 110. Figure 3 As shown in the example, the electrode stack 110 has a first collector layer 111, a first electrode active material layer 112, a solid electrolyte layer 113, a second electrode active material layer 114, and a second collector layer 115 in sequence, and an insulating component 120 is arranged on at least a portion of the end face of the electrode stack 110. The insulating component 120 includes a mixture of a resin 121 and an insulating filler 122, and the thermal conductivity of the insulating filler 122 is greater than the thermal conductivity of the resin 121.

[0142] As described above, in batteries including an electrode stack, the electrode stack sometimes generates heat during charge and discharge, and the current collector layer in the electrode stack, in particular, tends to reach high temperatures. The inventors of the present application have discovered that by including an insulating member disposed on an end face of the electrode stack comprising a mixture of a resin and an insulating filler having a higher thermal conductivity than the resin, heat generated in the electrode stack can be dissipated to the outside of the battery via the insulating member.

[0143] In the solid battery 10 of the present disclosure, the second current collector layer 115 may extend from the electrode stack 110. In this case, the second current collector layer 115 may be in contact with the insulating member 120, and in particular, the second current collector layer 115 may be in adhesive contact with the insulating member 120. With this configuration, heat generated in the electrode stack 110 can be dissipated to the outside of the battery via the insulating member 120 and the second current collector 115.

Claims

1. Solid state battery, which is a solid state battery with an electrode stack. The electrode stack comprises a first current collector layer, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second current collector layer in this order. An insulating member is disposed on at least a portion of an end surface of the electrode stack. The second current collector layer extends from an end surface of the electrode stack on which the insulating member is disposed, and The second current collector layer is in contact with the insulating member.

2. The solid state battery according to claim 1, wherein The electrode stack includes the first electrode active material layer, the solid electrolyte layer, the second electrode active material layer, and the second current collector layer in this order on both sides of the first current collector layer, and One of the second current collector layers is in contact with the insulating member.

3. The solid state battery according to claim 2, wherein The insulating member is disposed on the end surface of the electrode stack from one second electrode active material layer to another second electrode active material layer, and The second current collector layer is in contact with the insulating member over 50% or more of the surface area of ​​the insulating member.

4. The solid state battery according to claim 1, wherein The insulating member includes a thermoplastic resin.

5. The solid state battery according to claim 1, wherein The insulating member includes a mixture of a resin and an insulating filler, and the insulating filler has a thermal conductivity greater than that of the resin.

6. The solid state battery according to claim 5, wherein The insulating filler is a metal oxide.

7. The solid state battery according to any one of claims 1 to 6, wherein The first current collector layer is a negative electrode current collector layer, the first electrode active material layer is a negative electrode active material layer, the second electrode active material layer is a positive electrode active material layer, and the second current collector layer is a positive electrode current collector layer. A battery module comprising the solid state battery according to claim 7 .

9. The method for producing a solid battery according to any one of claims 1 to 6, comprising the following steps: (a) stacking the first current collector layer, the first electrode active material layer, the solid electrolyte layer, and the second electrode active material layer in this order to form a preliminary stack; (b) applying the insulating member to at least a portion of an end surface of the preliminary laminate; (c) after applying the insulating member, laminating the second electrode active material layer in the preliminary laminate with the second current collector layer to form the electrode laminate; and (d) The second current collector layer is brought into contact with the insulating member.

10. The method according to claim 9, wherein: The insulating member includes a thermoplastic resin, and in the step (d), the second current collector layer is pressed against the insulating member to be bonded while being heated.

11. Solid state battery, which is a solid state battery with an electrode stack. The electrode stack comprises a first current collector layer, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second current collector layer in this order. An insulating member is disposed on at least a portion of an end surface of the electrode stack. The insulating member comprises a mixture of resin and insulating filler, and The thermal conductivity of the insulating filler is greater than the thermal conductivity of the resin.

Images