Laminate battery module

Abstract

To provide a laminated battery module capable of connecting laminated batteries to each other even when rigidity of a collector terminal and a bus bar is large.SOLUTION: A laminate battery module in which a plurality of laminate batteries are laminated each other, in which each laminate battery has an electrode laminate 130, a current collecting terminal 110 connected to a current collecting foil 131 of the electrode laminate 130, and a laminate film 140 sealing the electrode laminate 130 together with the current collecting terminal 110, and has a bus bar 120 electrically connected to the current collecting terminal 110. The bus bars 120 of the plurality of laminated batteries adjacent to each other are connected to each other by a fastening member 300, the electrode laminate 130 is restrained in a stacking direction of the electrode laminate 130, and the current collecting terminal 110 and each bus bar 120 move far and near with respect to the stacking direction of the electrode laminate 130.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a laminated battery module. [Background technology]

[0002] A laminated battery is a battery in which an electrode laminate having, for example, a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer is covered with a laminate film and sealed. Regarding a plurality of laminated batteries, the following assembled battery (laminated battery module) is known in which the current collector terminals of each laminated battery are connected to each other.

[0003] For example, Patent Document 1 discloses a battery assembly including a battery assembly in which a plurality of battery cells having electrode terminals (current collector terminals) on their side surfaces are stacked in the stacking direction, a holding member extending in the stacking direction of the battery cells, a plurality of voltage detection terminals held by the holding member and each electrically connected to the electrode terminals, and a plurality of voltage detection wires extending in the stacking direction along the holding member and held by the holding member, electrically connecting the voltage detection terminals to an external circuit that detects the voltage of each of the battery cells.The battery assembly in Patent Document 1 is said to be able to improve the ease of installing the voltage detection wires. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-087721 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, in the laminate battery module described above, when multiple laminate batteries are stacked and electrically connected, the collector terminals and bus bars must be thinned and made low rigid so that component tolerances can be absorbed by deformation of the collector terminals and bus bars. However, thinning the collector terminals and bus bars increases their electrical resistance, increasing the amount of heat generated when current is applied, resulting in energy loss.

[0006] Therefore, an object of the present disclosure is to provide a laminate battery module in which laminate batteries are electrically connected to each other even when the rigidity of the current collector terminals and bus bars is high. [Means for solving the problem]

[0007] The present disclosure achieves the above object by the following means.

[0008] <Aspect 1> A laminated battery module in which a plurality of laminated batteries are stacked on top of each other, the laminate battery includes an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal, and a bus bar electrically connected to the current collecting terminal; the bus bars of adjacent laminate batteries are connected to each other by fastening members, The electrode stack is constrained in the stacking direction of the electrode stack, and The current collecting terminal and the bus bar move toward and away from the electrode stack. Laminated battery module. <Aspect 2> A laminated battery module according to aspect 1, wherein the current collecting terminals and the bus bars have a thickness greater than the thickness of the current collecting foil and the laminate film. <Aspect 3> 3. The laminate battery module according to claim 1, wherein the current collector terminal and the bus bar each have a thickness of 0.5 mm or more. <Aspect 4> the bus bars each have a connection portion connected to the current collecting terminal, a fastening portion at which the bus bars are fastened to each other, and an intermediate portion connecting the connection portion and the fastening portion, The angle between the surface having the fastening portion and the surface having the intermediate portion is 10 to 40 degrees, and an angle between the surface having the fastening portion and the surface having the connection portion is approximately perpendicular; 4. The laminate battery module according to any one of the first to third embodiments. <Aspect 5> A method for manufacturing a laminate battery module, comprising: the laminate battery module has a plurality of laminate batteries stacked on top of each other; The laminate battery has an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal; The manufacturing method includes: electrically connecting a bus bar to the current collecting terminal; Restraining the electrode stack in a stacking direction of the electrode stack while allowing the current collecting terminal and the bus bar to move toward and away from the electrode stack; and connecting the bus bars of adjacent laminate batteries to each other with fastening members; Including, Manufacturing method for laminated battery modules. [Effects of the Invention]

[0009] According to the laminate battery module of the present disclosure, the laminate batteries are electrically connected to each other even when the collector terminals and bus bars have high rigidity. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram for explaining a laminate battery module of the present disclosure. [Figure 2]FIG. 2 is a schematic diagram for explaining the laminate battery module of the present disclosure. [Figure 3] FIG. 3 is a schematic diagram for explaining a bus bar in the present disclosure. [Figure 4] FIG. 4 is a schematic diagram for explaining the method for manufacturing a laminate battery module according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the present disclosure. In addition, in the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted.

[0012] Laminated battery module The laminate battery module of the present disclosure comprises: A laminated battery module in which a plurality of laminated batteries are stacked on top of each other, the laminate battery includes an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal, and a bus bar electrically connected to the current collecting terminal; the bus bars of adjacent laminate batteries are connected to each other by fastening members, The electrode stack is constrained in the stacking direction of the electrode stack, and The current collecting terminal and the bus bar move toward and away from the electrode stack.

[0013] According to the laminate battery module of the present disclosure, the laminate batteries are electrically connected to each other even when the collector terminals and bus bars have high rigidity.

[0014] Without being limited by theory, it is presumed that because the electrode laminate is constrained in the stacking direction of the electrode laminate and the current collecting terminals and bus bars move towards and away from the electrode laminate, specifically, for example, because the current collecting foil and laminate film have low rigidity, the current collecting terminals and bus bars move towards and away from the electrode laminate, the laminate battery has flexibility in a direction perpendicular to the stacking direction of the electrode laminate, and even if the current collecting terminals and bus bars have high rigidity, the flexibility of the laminate battery absorbs component tolerances, etc., and thereby laminate batteries are electrically connected to each other.

[0015] Furthermore, even when the current collecting terminals and bus bars are large in volume, for example, when the current collecting terminals and bus bars are thick and therefore highly rigid, the laminated batteries in the laminated battery module of the present disclosure are electrically connected to each other. This reduces electrical resistance and the amount of heat generated when current is applied, compared to laminated battery modules made with thinner current collecting terminals and bus bars that have low rigidity, and it is therefore presumed that this reduces energy loss.

[0016] 1 and 2 are schematic diagrams showing one embodiment of a laminate battery module of the present disclosure, but the present disclosure is not limited to this embodiment.

[0017] FIG. 1A shows one laminate battery 100 included in a laminate battery module 10. The laminate battery 100 shown in FIG. 1A has four current collector terminals 110, two on each side, one above the other. For example, if the current collector terminal 110 on one side is a positive electrode current collector terminal, the current collector terminal 110 on the other side is a negative electrode current collector terminal. FIG. 1B shows the laminate battery module 10. In the laminate battery module 10, multiple laminate batteries 100 are stacked on top of each other in the stacking direction of the electrode stack, and are restrained in the stacking direction of the electrode stack by restraint bands 200. The bus bars 120 of adjacent laminate batteries 100 are connected to each other with fastening members. In FIG. 1B, the laminated battery module 10 is arranged, for example, so that the polarities of the collector terminals of adjacent laminated batteries are different from each other, and adjacent laminated batteries are electrically connected to each other by bus bars 120, so that each laminated battery 100 is electrically connected in series.

[0018] FIG. 2 shows a cross section of adjacent laminated batteries near the busbars. FIG. 2A shows the laminated batteries not connected to each other with fastening members, while FIG. 2B shows the laminated batteries connected to each other with fastening members. In FIG. 2A, the laminated battery 100 includes an electrode laminate 130, a current collecting terminal 110 connected to a current collecting foil 131 of the electrode laminate 130, and a laminate film 140 that seals the electrode laminate 130 together with the current collecting terminal 110. The laminated battery 100 also includes a busbar 120 electrically connected to the current collecting terminal 110. Because the current collecting foil 131 and laminate film 140 have low rigidity, the current collecting terminal 110 and busbar 120 of the laminated battery 100 can move toward or away from the electrode laminate, even if the current collecting terminal 110 and busbar 120 have high rigidity.

[0019] As shown in FIG. 2B , in the present disclosure, in the laminated battery module, the electrode stack 130 is restrained by the restraint band 200 in the stacking direction of the electrode stack 130, and the current collecting terminal 110 and the bus bar 120 move toward and away from the stacking direction of the electrode stack 130. When the bus bars 120 of adjacent laminated batteries are connected to each other with fastening members 300, for example, by placing the bus bar 120 of one laminated battery on top of the bus bar 120 of the other laminated battery, the current collecting terminals 110 and bus bars 120 of each laminated battery can move toward or away from the electrode laminate 130, specifically in the direction of the arrows shown in FIG. 2B. This allows the laminated battery 100 to be flexible in a direction perpendicular to the stacking direction of the electrode laminate 130, and the flexibility of the laminated battery 100 can absorb component tolerances, etc., and as a result, the laminated batteries 100 can be electrically connected to each other even if the current collecting terminals 110 and bus bars 120 are highly rigid.

[0020] The structure of the fastening members is not particularly limited, but may be a fastening structure using bolts and nuts. For example, when a fastening structure using bolts and nuts is used as the fastening members, the volume of the bus bar is further increased, the heat capacity is improved, and the heat dissipation area is expanded, thereby suppressing heat generation from the battery.

[0021] In the laminate battery module of the present disclosure, The bus bars may have, but are not particularly limited to, connection portions that are connected to the current collecting terminals, fastening portions that fasten the bus bars together, and intermediate portions that connect the connection portions and fastening portions.

[0022] The angle between the surface having the fastening portion and the surface having the intermediate portion is not particularly limited, but is preferably 10 to 40°. The angle between the surface having the fastening portion and the surface having the intermediate portion may be 10° or more, 15° or more, or 20° or more, or may be 40° or less, 35° or less, or 30° or less.

[0023] The angle between the surface having the fastening portion and the surface having the connecting portion is not particularly limited, but is preferably approximately perpendicular. The angle between the surface having the fastening portion and the surface having the connecting portion may be 70° or more, 80° or more, 85° or more, 87° or more, or 89° or more, or may be 110° or less, 100° or less, 95° or less, 93° or less, or 91° or less.

[0024] FIG. 3 is a schematic diagram of one embodiment of a bus bar according to the present disclosure, but is not limited to this embodiment.

[0025] 3A, busbar 120 has connecting portion 120a connected to current collecting terminal 110, fastening portion 120b where busbars 120 are fastened to each other, and intermediate portion 120c connecting connecting portion 120a and fastening portion 120b. Angle 120d between the surface having fastening portion 120b and the surface having intermediate portion 120c is the angle formed by the surface having fastening portion 120b and the surface having intermediate portion 120c. This angle 120d is not particularly limited, but is preferably 10 to 40°. In FIG. 3B, angle 120e between the surface having fastening portion 120b and the surface having connecting portion 120a is the angle formed by the surface having fastening portion 120b and the surface having connecting portion 120a. This angle 120e is not particularly limited, but is preferably approximately perpendicular and is preferably 70 to 110°. 3, when the busbars 120 of adjacent laminated batteries are connected to each other with fastening members 300, as shown in FIG. 2, for example, with the busbar 120 of one laminated battery positioned above the busbar 120 of the other laminated battery, as the adjacent laminated batteries 100 approach each other, the surface of the busbar 120 with the fastening portion 120b of the busbar 120 of the lower laminated battery 100 moves along the surface of the busbar 120 with the middle portion 120c of the busbar 120 of the upper laminated battery 100, causing the current collecting terminal 110 and busbar 120 to move toward or away from the electrode laminate 130. In this way, unintended loads on the connections between laminated batteries 100 are reduced, thereby reducing the risk of damage to the current collecting foils 131 of the laminated batteries 100.

[0026] <<Laminated Battery Module Manufacturing Method>> The method for manufacturing a laminate battery module of the present disclosure includes: The laminated battery module has a plurality of laminated batteries stacked together. The laminate battery has an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal; The manufacturing method includes: electrically connecting a bus bar to the current collecting terminal; Restraining the electrode stack in the stacking direction of the electrode stack while allowing the current collecting terminal and the bus bar to move toward and away from the stacking direction of the electrode stack; and connecting the bus bars of adjacent laminate batteries to each other with fastening members; Includes.

[0027] According to the manufacturing method of the laminated battery module of the present disclosure, laminated batteries can be connected to each other even when the collector terminals and bus bars of the multiple laminated batteries have high rigidity.

[0028] FIG. 4 is a schematic diagram showing one embodiment of the method for producing a laminate battery module of the present disclosure, but the present disclosure is not limited to this embodiment.

[0029] FIG. 4 shows the vicinity of the current collector terminals and bus bars of adjacent laminated batteries stacked together. As shown in FIG. 4A, a laminated battery 100 includes an electrode laminate 130, a current collector terminal 110 connected to a current collector foil 131 of the electrode laminate 130, and a laminate film 140 that seals the electrode laminate 130 together with the current collector terminal 110. In the manufacturing method of a laminated battery module of the present disclosure, first, as shown in FIG. 4B, a bus bar 120 is electrically connected to the current collector terminal 110. The electrical connection method is not particularly limited, but any known method can be used. Next, as shown in FIG. 4C, the electrode laminate 130 is restrained by a restraint band 200 in the stacking direction of the electrode laminate while allowing the current collector terminal 110 and bus bar 120 to move toward and away from the electrode laminate 130. 4D, the bus bars of adjacent laminate batteries are connected to each other with fastening members 300. By restraining the electrode laminate 130 with restraint bands 200 in the stacking direction of the electrode laminate 130 while allowing the current collector terminals 110 and bus bars 120 to move toward and away from the electrode laminate 130, the laminate battery 100 is given flexibility in the direction perpendicular to the stacking direction of the electrode laminate 130. Even if the current collector terminals 110 and bus bars 120 are highly rigid, the flexibility of the laminate battery 100 can absorb component tolerances, etc., and thereby laminate batteries 100 can be electrically connected to each other.

[0030] <<Laminated Battery Module and Manufacturing Method Thereof; Each Configuration>> The following describes each component of the laminate battery module and its manufacturing method.

[0031] In the present disclosure, the laminate battery may be a liquid-based battery containing an electrolytic solution as the electrolyte layer, or a solid-state battery having a solid electrolyte layer as the electrolyte layer. In the present disclosure, the term "solid-state battery" refers to a battery that uses at least a solid electrolyte as the electrolyte, and therefore a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as the electrolyte. Furthermore, in the present disclosure, the laminate battery may be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as the electrolyte.

[0032] In the present disclosure, a "composite" refers to a composition that can constitute a positive electrode active material layer, etc., either as it is or by further containing other components. Also, in the present disclosure, a "composite slurry" refers to a slurry that contains a dispersion medium in addition to a "composite" and can be applied and dried to form a positive electrode active material layer, etc.

[0033] <Laminated battery> The laminate battery includes a current collecting terminal, a bus bar, an electrode laminate, and a laminate film.

[0034] The current collecting terminal is connected to the current collecting foil of the electrode laminate. The current collecting terminal may be electrically connected to the current collecting foil serving as the positive current collecting layer of the electrode laminate described below, or may be electrically connected to the current collecting foil serving as the negative current collecting layer of the electrode laminate. The material of the current collecting terminal is not particularly limited, but metals such as aluminum and stainless steel (SUS) can be used.

[0035] The thickness of the current collecting terminal is greater than the thickness of the current collecting foil and the laminate film, and may be, for example, 2 times or more, 4 times or more, 6 times or more, 8 times or more, 10 times or more, 15 times or more, 20 times or more, 25 times or more, 30 times or more, 35 times or more, 40 times or more, 45 times or more, or 50 times or more the thickness of the thicker of the current collecting foil or the laminate film, or may be 500 times or less, 400 times or less, 300 times or less, 200 times or less, or 100 times or less.

[0036] The thickness of the current collecting terminal may be 0.5 mm or more, 0.8 mm or more, 1.0 mm or more, 1.5 mm or more, or 2.0 mm or more, and may be 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, 7.0 mm or less, 6.0 mm or less, or 5.0 mm or less.

[0037] Busbar The bus bar is electrically connected to the current collecting terminal. The material of the bus bar is not particularly limited, but metal or the like can be used.

[0038] The thickness of the bus bar is greater than the thickness of the current collecting foil and the laminate film, and may be, for example, 2 times or more, 4 times or more, 6 times or more, 8 times or more, 10 times or more, 15 times or more, 20 times or more, 25 times or more, 30 times or more, 35 times or more, 40 times or more, 45 times or more, or 50 times or more the thickness of the thicker of the current collecting foil or the laminate film, or may be 500 times or less, 400 times or less, 300 times or less, 200 times or less, or 100 times or less.

[0039] The thickness of the bus bar may be 0.5 mm or more, 0.8 mm or more, 1.0 mm or more, 1.5 mm or more, or 2.0 mm or more, and may be 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, 7.0 mm or less, 6.0 mm or less, or 5.0 mm or less.

[0040] <Electrode laminate> The electrode stack is not particularly limited, but may have a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer in this order.

[0041] <Positive electrode current collector layer> The material used for the positive electrode current collector layer is not particularly limited, and any material commonly used for a battery positive electrode current collector can be appropriately adopted. Examples of materials used for the positive electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The positive electrode current collector layer may have a coating layer on its surface for purposes such as adjusting resistance. The positive electrode current collector layer may also be a metal foil or a substrate on which the above metals are plated or vapor-deposited.

[0042] The shape of the positive electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0043] The thickness of the positive electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0044] <Cathode active material layer> The positive electrode active material layer contains at least a positive electrode active material, and may further contain, optionally, a solid electrolyte, a conductive additive, a binder, etc. The positive electrode active material layer may also contain various other additives. The contents of the positive electrode active material, solid electrolyte, conductive additive, binder, etc. in the positive electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire positive electrode active material layer (total solid content) is taken as 100 mass%, the content of the positive electrode active material may be 40 mass% or more, 50 mass% or more, 60 mass% or more, or 100 mass% or less, or 90 mass% or less.

[0045] (Cathode active material) The material of the positive electrode active material is not particularly limited as long as it can absorb and release lithium ions. Examples of the positive electrode active material include lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganese oxide (LiMnO), and nickel-cobalt-manganese oxide (NCM:LiCO 1 / 3 Ni 1 / 3 Mn 1 / 3O2), lithium nickel-cobalt-aluminate (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y The material may be, but is not limited to, a different 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).

[0046] The positive electrode active material may have a coating layer, although it is not particularly limited. The coating layer is a layer containing a substance that has lithium ion conductivity, low reactivity with the positive electrode active material and the solid electrolyte, and can maintain the shape of the coating layer without flowing even when in contact with the active material and the solid electrolyte. Specific examples of materials that constitute the coating layer include LiNbO3 and Li4Ti5O 12 , Li3PO4, etc., but are not limited to these.

[0047] The shape of the positive electrode active material is not particularly limited as long as it is a general shape for a positive electrode active material of a battery. The positive electrode active material may be, for example, in the form of particles. The positive electrode active material may be in the form of primary particles or secondary particles formed by agglomeration of a plurality of primary particles. The average particle diameter D of the positive electrode active material 50 The average particle size D may be, for example, 1 nm or more, 5 nm or more, or 10 nm or more, and may be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. 50 is the particle size (median size) at 50% cumulative value in the volume-based particle size distribution determined by laser diffraction / scattering method.

[0048] (solid electrolyte) The material of the solid electrolyte is not particularly limited, and may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a polymer electrolyte.

[0049] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, and argyrodite-type solid electrolytes. Specific examples of sulfide solid electrolytes include Li2S-P2S5-based (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 ), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x PS 6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0050] An example of an oxide solid electrolyte is 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, or Li 3+x PO 4-x N x (LiPON), etc.; or combinations thereof.

[0051] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0052] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0053] (Conductive additive) The conductive additive is not particularly limited. The conductive additive may be, for example, vapor grown carbon fiber (VGCF), acetylene black (AB), ketjen black (KB), carbon nanotube (CNT), carbon nanofiber (CNF), etc., but is not limited thereto. The conductive additive may be, for example, particulate or fibrous, and its size is not particularly limited. The conductive additive is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0054] (binder) The binder is not particularly limited. The binder may be, for example, polyvinylidene fluoride (PVdF), butadiene rubber (BR), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), or other materials, but is not limited to these. The binder is not particularly limited, and one type may be used alone, or two or more types may be used in combination.

[0055] The shape of the positive electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like positive electrode active material layer. The thickness of the positive electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0056] The positive electrode active material layer can be produced by applying a known method. For example, the positive electrode active material layer can be easily formed by dry or wet molding a positive electrode composite containing the above-mentioned various components. The positive electrode active material layer may be formed together with the positive electrode current collector layer or may be formed separately from the positive electrode current collector layer.

[0057] <Electrolyte layer - solid electrolyte layer> The battery of the present disclosure can be a solid-state battery, i.e., have a solid electrolyte layer as an electrolyte layer. The solid electrolyte layer contains at least a solid electrolyte and may also contain a conductive additive, a binder, etc. as necessary.

[0058] For the solid electrolyte, the conductive additive, and the binder, reference can be made to the above description of "<Positive electrode active material layer>".

[0059] The thickness of the solid electrolyte layer is not particularly limited, but may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0060] The solid electrolyte layer can be easily formed, for example, by dry or wet molding a solid electrolyte mixture containing the above-mentioned solid electrolyte and a binder.

[0061] <Electrolyte layer-electrolyte> The battery of the present disclosure can be a liquid battery, i.e., have an electrolyte solution as the electrolyte layer, particularly an electrolyte solution held in a separator layer.

[0062] (electrolyte) The electrolyte is not particularly limited, but preferably contains a supporting salt and a solvent.

[0063] The supporting salt (lithium salt) of the electrolyte solution having lithium ion conductivity is not particularly limited, but examples thereof include inorganic lithium salts and organic lithium salts. Examples of inorganic lithium salts include, but are not limited to, LiPF, LiBF, LiClO, and LiAsF. Examples of organic lithium salts include, but are not limited to, LiCF, SO, LiN(CF, SO), LiN(CF, SO), LiN(FSO), LiC(CF, SO), and LiC(CF, SO).

[0064] The solvent used in the electrolyte solution is not particularly limited, but examples thereof include cyclic carbonates, chain carbonates, etc. Examples of cyclic carbonates include, but are not limited to, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), etc. Examples of chain carbonates include, but are not limited to, dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. The electrolyte solution is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0065] (separator) The separator is not particularly limited, and any separator commonly used for batteries can be appropriately used, such as a polyolefin-based, polyamide-based, or polyimide-based nonwoven fabric.

[0066] <Negative electrode active material layer> The negative electrode active material layer contains at least a negative electrode active material, and may further contain, optionally, a conductive additive, a binder, a solid electrolyte, and the like. The negative electrode active material layer may also contain various other additives. The contents of the negative electrode active material, solid electrolyte, conductive additive, binder, and the like in the negative electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire negative electrode active material layer (total solid content) is taken as 100 mass%, the content of the negative electrode active material may be 40 mass% or more, 50 mass% or more, or 60 mass% or more, or may be 100 mass% or less, or 90 mass% or less.

[0067] (Negative electrode active material) As the negative electrode active material, various substances can be used that have a potential (charge / discharge potential) for absorbing and releasing lithium ions that is lower than that of the positive electrode active material of the present disclosure. The material for the negative electrode active material is not particularly limited, and may be metallic lithium or a material capable of absorbing and releasing metal ions such as lithium ions. Examples of materials capable of absorbing and releasing metal ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, and lithium titanate (Li4Ti5O 12 ) and the like can be mentioned, but are not limited to these.

[0068] The alloy-based negative electrode active material is not particularly limited, 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, and solid solutions thereof. The Si alloy-based negative electrode active material may contain metal elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, and Ti. Examples of Sn alloy-based negative electrode active materials include tin, tin oxide, tin nitride, and solid solutions thereof. The Sn alloy-based negative electrode active material may contain metal elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, and Si.

[0069] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0070] The shape of the negative electrode active material is not particularly limited, and may be any shape commonly used for negative electrode active materials in batteries. The negative electrode active material may be, for example, in the form of particles or a sheet.

[0071] For the solid electrolyte, conductive additive, and binder that can be contained in the negative electrode active material layer, the description in the "<Positive electrode active material layer>" above can be referred to.

[0072] The shape of the negative electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like negative electrode active material layer. The thickness of the negative electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0073] The negative electrode active material layer can be produced by applying a known method. For example, the negative electrode active material layer can be easily formed by dry or wet molding a negative electrode composite containing the above-mentioned various components. The negative electrode active material layer may be formed together with the negative electrode current collector layer or may be formed separately from the negative electrode current collector layer.

[0074] <Negative electrode current collector layer> The material used for the negative electrode current collector layer is not particularly limited, and any material commonly used for a negative electrode current collector in a battery can be appropriately used. Examples of materials used for the negative electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and a carbon sheet. The negative electrode current collector layer may have a coating layer on its surface for the purpose of adjusting resistance, etc.

[0075] The shape of the negative electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0076] The thickness of the negative electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0077] <Laminating film> The laminate film has a fusion layer and a metal layer. The laminate film is not particularly limited, but may have a fusion layer, a metal layer, and a resin layer in this order.

[0078] (fusion layer) The material of the fusion layer is not particularly limited, but may be polyolefin resin, etc. Examples of polyolefin resins include, but are not limited to, polypropylene (PP) and polyethylene (PE). The thickness of the fusion layer is not particularly limited, but may be 30 μm or more, 40 μm or more, or 50 μm or more, or 110 μm or less, 100 μm or less, or 90 μm or less.

[0079] (metal layer) Examples of materials for the metal layer include, but are not limited to, aluminum, aluminum alloys, stainless steel, etc. The thickness of the metal layer is not particularly limited, but may be 20 μm or more, 30 μm or more, or 40 μm or more, or 70 μm or less, 60 μm or less, or 50 μm or less.

[0080] (resin layer) Examples of materials for the resin layer include, but are not limited to, polyethylene terephthalate, nylon, etc. The thickness of the resin layer is not particularly limited, but may be 70 μm or more, 80 μm or more, or 90 μm or more, or 270 μm or less, 250 μm or less, or 230 μm or less.

[0081] <Fastening members> The material of the fastening member is not particularly limited, but is preferably made of metal from the viewpoint of suppressing heat generation in the battery as described above.

[0082] <<Uses of laminated battery modules>> The laminate battery module of the present disclosure may be, for example, an on-board battery, or may be used as a power source for mobile objects other than vehicles (e.g., trains, ships, and aircraft), or may be used as a power source for electrical appliances such as information processing devices.

[0083] While embodiments of the disclosed laminated battery module and method of manufacturing a laminated battery module have been described, those skilled in the art will recognize that modifications are possible without departing from the scope of the claims. [Explanation of symbols]

[0084] 10 Laminated battery module 100 Laminated Batteries 110 Current collector terminal 120 Busbar 120a connection 120b Fastening section 120c middle part 120d Angle between the surface with the fastening part and the surface with the intermediate part 120e Angle between the surface with the fastening part and the surface with the connection part 130 Electrode laminate 131 Current collecting foil 140 Laminating Film 200 Restraint Band 300 Fastening members

Claims

1. A laminated battery module in which a plurality of laminated batteries are stacked on top of each other, the laminate battery comprises an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal, and a bus bar electrically connected to the current collecting terminal; The bus bars of adjacent laminate batteries are connected to each other by fastening members, The electrode stack is constrained in the stacking direction of the electrode stack, and The current collecting terminal and the bus bar move toward and away from the electrode stack. Laminated battery module.

2. The laminate battery module according to claim 1 , wherein the thickness of the current collector terminals and the bus bars is greater than the thickness of the current collector foil and the laminate film.

3. 2. The laminate battery module according to claim 1, wherein the current collector terminals and the bus bars each have a thickness of 0.5 mm or more.

4. the bus bars each have a connection portion connected to the current collecting terminal, a fastening portion at which the bus bars are fastened to each other, and an intermediate portion connecting the connection portion and the fastening portion, The angle between the surface having the fastening portion and the surface having the intermediate portion is 10 to 40 degrees; and The angle between the surface having the fastening portion and the surface having the connection portion is approximately perpendicular. The laminate battery module according to any one of claims 1 to 3.

5. A method for manufacturing a laminate battery module, comprising: the laminated battery module has a plurality of laminated batteries stacked on top of each other; The laminate battery has an electrode laminate, a current collecting terminal connected to a current collecting foil of the electrode laminate, and a laminate film sealing the electrode laminate together with the current collecting terminal; The manufacturing method comprises: electrically connecting a bus bar to the current collecting terminal; Restraining the electrode stack in the stacking direction of the electrode stack while allowing the current collecting terminal and the bus bar to move toward and away from the stacking direction of the electrode stack; and connecting the bus bars of adjacent laminate batteries to each other with fastening members; Including, Manufacturing method for laminated battery modules.

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