JP2014130754A - Solid-state battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-state battery which facilitates manufacturing when a solid-state battery in which at least an insulating member is disposed at an end part is manufactured in a zigzag pattern.SOLUTION: The solid-state battery comprises: a first part 2a in which anode electrode layers 3, 3 are disposed on both faces, and anode active material layers 4, 4 are coated on the anode electrode layers 3, 3 on each of the faces; a second part 2b in which cathode electrode layers 6, 6 are disposed on both faces, and cathode active material layers 7, 7 are coated on the cathode electrode layers 4, 4 on each of the faces; and an insulating member 2 positioned between the first part 2a and the second part 2b and having a third part 2c inside of which is formed a hole. The first part 2a, the third part 2c, and the second part 2b are laminated in that order by folding the insulating member 2 in a zigzag pattern, and a solid-state electrolyte layer 5 is placed in the hole of the third part 2c while the first part 2a, the third part 2c, and the second part 2b in the laminated state. If the insulating layer 2 has a plurality of third parts 2c, it is preferable that the hole sizes of the plurality of third parts 2c are different.

Description

  The present invention relates to an all solid state battery.

  All-solid-state batteries are being developed as next-generation batteries capable of high capacity / high output. The all-solid-state battery uses a solid electrolyte instead of the liquid electrolyte used in the conventional secondary battery, can increase the energy density, and is excellent in safety. However, since all-solid-state batteries are not provided with separators like liquid batteries, there is a problem of short-circuiting due to defects (for example, cracking or chipping of the active material) or electrode burrs at the outer peripheral edge of the battery. . In particular, when the all-solid-state battery is used in a vibrating application such as a vehicle, there is a high possibility that these problems will occur. Therefore, some all solid state batteries are provided with an insulating film or the like at the outer peripheral end.

  In Patent Document 1, the edge portions of the negative electrode active material layer and the positive electrode active material layer and the peripheral portion of the end surface facing the solid electrolyte layer are each coated with an insulating material, and are coated with a negative electrode current collector and an insulating material. An all-solid battery manufactured by applying pressure in a state where a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer coated with an insulating material, and a positive electrode current collector are laminated is disclosed. In Patent Document 2, a first sheet in which a negative electrode mixture layer (negative electrode active material) is provided on both surfaces of a negative electrode current collector is formed, and a positive electrode mixture layer (positive electrode active material) is formed on a main surface of the positive electrode current collector. The second sheet is provided with a plurality of substances) via the uncoated part, and the uncoated part is formed on the main surface side of the second sheet. An insulating film is disposed so as to cover the end face on the coated part side and the end face on the mixture layer uncoated part side of the other positive electrode mixture layer, on the main surface of the second sheet or both surfaces of the first sheet Disclosed is an all-solid battery that is manufactured by disposing an electrolyte film, laminating a negative electrode mixture layer and a positive electrode mixture layer, and folding them at the mixture layer uncoated portion of the second sheet. Yes.

JP 2012-38425 A JP 2003-100350 A

  In the case of the all-solid-state battery disclosed in Patent Documents 1 and 2, the insulating member is disposed after the positive electrode and the negative electrode are produced. Since the insulating member such as an insulating film is a very thin member, it is very difficult to position and fix the insulating member on the end of the active material layer or the like. Furthermore, when manufacturing by zigzag folding like the all-solid-state battery disclosed in Patent Document 2, it is difficult to accurately bend the current collector and the insulating member having different hardness, thickness, frictional force, etc. at the same time. It is difficult to align with. Therefore, it is very difficult to manufacture an all-solid battery in which an insulating member is disposed at an end portion by spelling.

  Then, this invention makes it a subject to provide the all-solid-state battery which manufacture becomes easy when the all-solid-state battery by which an insulating member is arrange | positioned at an edge part is manufactured by zigzag folding.

  The all solid state battery according to the present invention has a negative electrode layer disposed on both sides, a first part in which a negative electrode active material layer is coated on the negative electrode layer on each side, and a positive electrode layer on both sides. And a second part in which a positive electrode active material layer is applied to the positive electrode layer on each side, and a third part located between the first part and the second part and having a hole formed inside. An insulating member is provided, and the first member, the third member, and the second member are stacked in this order by folding the insulating member in a zigzag manner, and the solid electrolyte layer is disposed in the hole of the third member in the stacked state. Features.

  This all-solid battery is a battery configured with a negative electrode layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode layer as one unit, and is laminated in a number as required. Furthermore, the all-solid-state battery has a structure in which an insulating member is disposed between each layer in order to prevent a short circuit due to a defect in the outer peripheral edge of the battery or an electrode burr. This structure is obtained by folding a series of insulating members. Therefore, the continuous insulating member has the first part to the third part, and according to the number of the first part to the third part stacked in the order of the first part, the third part, and the second part. Are arranged. In the first part, a negative electrode layer is disposed on both surfaces of the insulating member, and a negative electrode active material layer is coated on the negative electrode layer on each surface. In the second part, a positive electrode layer is disposed on both surfaces, and a positive electrode active material layer is coated on the positive electrode layer on each surface. The third part has a hole formed inside. The fixed electrolyte layer may be applied to the negative electrode active material layer on each side of the first part, may be applied to the positive electrode active material layer on each side of the second part, or the third part It may be coated on one side. The insulating member having the first part to the third part is folded between the first part and the third part, and the third part and the second part are sequentially folded, so that the first part and the third part are folded. And the second part. As a result, the negative electrode layer, the negative electrode active material layer, the solid electrolyte layer, the positive electrode active material layer, and the positive electrode layer are laminated in this order, and the insulating member is interposed between each electrode layer and between the positive electrode active material layer and the solid electrolyte layer. Is an all-solid-state battery in which is disposed. In particular, in the case of this all-solid battery, since there is a hole in the insulating member (third part) disposed between the positive electrode active material and the solid electrolyte, ions (electrons) move through the hole. it can. Further, since the portion of the insulating member (third part) where no hole is formed is interposed at the outer peripheral end between the positive electrode active material and the solid electrolyte, the outer peripheral end is protected, and the outer peripheral end defect or electrode Can prevent a short circuit due to burrs. Furthermore, since each electrode layer and each active material layer are disposed on both surfaces of the insulating member with reference to the continuous insulating member, the problem of positioning and fixing a very thin insulating member does not occur. Further, by adjusting the folding position between the first part and the third part and between the third part and the second part when zigzag folding, the negative electrode layer, the negative electrode active material layer, the solid electrolyte layer, the positive electrode The positioning of the active material layer, the positive electrode layer, and the third part hole (and consequently the insulating member at the outer peripheral end) can be made with high accuracy and ease. As described above, the all-solid-state battery has a structure in which each layer is arranged on the basis of a series of insulating members and then the insulating members are folded and manufactured, thereby facilitating positioning and easy manufacture.

  In the all solid state battery of the present invention, it is preferable that the insulating member has a plurality of third parts, and the sizes of the holes of the plurality of third parts are different.

  In the case of an all-solid battery in which a negative electrode layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode layer are stacked as a unit, the insulating member has a plurality of first to third parts. Become. In the third part, a hole is formed inside the insulating member, and a portion where the hole is not left remains as the insulating member. In the case where there are a plurality of third portions, when the layers are zigzag folded and stacked, the thickness of the insulating member is accumulated for the number of the third portions for the portions where no holes are formed. In particular, when the sizes of the holes of the plurality of third parts are all the same, the portions where the holes of the plurality of third parts are not open all have the same width, so the thickness of the insulating member is the same as the number of the third parts. Accumulated at each location to form one step. Since the all-solid battery is externally restrained in a folded state, a large shearing force acts when the step becomes large (when the number of the third part increases). Therefore, the sizes of the holes of the plurality of third parts are made different sizes, and the widths of the portions where the holes of the plurality of third parts are not vacant are changed. Thereby, the thickness of the insulating member in the portion where the plurality of third portion holes are not formed is not accumulated at the same place, and a plurality of steps are formed. Therefore, even if externally restrained in a zigzag folded state, a large shearing force does not act because of a plurality of small steps. Thus, this all-solid-state battery can suppress the shearing force due to the accumulation of the thickness of the insulating member by the plurality of third parts by making the sizes of the holes of the plurality of third parts different, thereby preventing shearing. it can.

  According to the present invention, positioning is facilitated and manufacturing is facilitated by adopting a structure in which each layer is arranged with reference to a series of insulating members and then the insulating members are folded and manufactured.

It is a side view of the all-solid-state battery (state without an exterior film etc.) which concerns on this Embodiment. It is a top view of the all-solid-state battery which concerns on this Embodiment, (a) is a state without an exterior film etc., (b) is a state with an exterior film etc. FIG. 2 is a plan view of the all solid state battery of FIG. 1 developed (before zigzag folding). It is the figure which expanded a part of the expanded state of FIG. 3, (a) is a top view, (b) is a side view. It is a sectional side view which shows the state of insulation film accumulation, (a) is a case where all the magnitude | sizes of the hole of the 3rd part of an insulation film are the same, (b) is the case of the hole of the 3rd part of an insulation film. This is a case where the size is gradually changed.

  Embodiments of an all-solid battery according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted. In addition, in FIG. 1 etc., in order to show the lamination structure of each layer and an insulating film in an easy-to-understand manner, it is drawn with an all-solid-state battery excluding the exterior film etc. (however, only the exterior film etc. in FIG. 2B). Each layer and insulating film are drawn with a thickness larger than the actual size of the plane. Moreover, in FIG. 1 etc., in order to make each layer and an insulating film easy to see, each layer and an insulating film are drawn in a different pattern, respectively.

  In this embodiment, the all solid state battery according to the present invention is applied to an all solid state battery of a lithium ion secondary battery. The all-solid-state battery according to the present embodiment is a battery configured with a negative electrode layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode layer as one unit. Multiple layers are stacked. The number to be stacked is determined according to the required voltage and the like depending on the application in which the all solid state battery is used. The all solid state battery according to the present embodiment is manufactured by a method in which such a laminated structure is zigzag folded. The all solid state battery according to the present embodiment is used for, for example, a battery of an automobile having a motor as a drive source such as an electric vehicle or a hybrid vehicle.

  With reference to FIGS. 1-4, the all-solid-state battery 1 which concerns on this Embodiment is demonstrated. FIG. 1 is a side view of an all solid state battery (with no exterior film or the like) according to the present embodiment. FIG. 2 is a plan view of the all solid state battery according to the present embodiment, in which (a) shows a state where there is no exterior film or the like, and (b) shows a state where there is an exterior film or the like. FIG. 3 is a plan view of the all solid state battery shown in FIG. 1 (before zigzag folding). 4 is an enlarged view of a part of the unfolded state of FIG. 3, in which (a) is a plan view and (b) is a side view.

  The all-solid-state battery 1 has a structure in which a continuous insulating film 2 is disposed between layers in a laminated structure in order to prevent short-circuiting due to defects at the outer peripheral edge of the battery or electrode burrs. The insulating film 2 has a first part 2a in which a negative electrode layer 3, a negative electrode active material layer 4 and a fixed electrolyte layer 5 are arranged on both sides, and a positive electrode layer 6 and a positive electrode active material layer 7 on both sides. It has the 2nd part 2b and the 3rd part 2c in which the hole 2d was formed inside between the 1st part 2a and the 2nd part 2b. In the continuous insulating film 2, the first part 2a to the third part 2c are repeatedly arranged according to the number of the first part 2a, the third part 2c, the second part 2b, and the third part 2c stacked in this order. The first film 2a, the third film 2c, the second film 2b, and the third film 2c are stacked in this order by bending the parts of the insulating film 2 in order.

  The insulating film 2 is an insulating member disposed between the negative electrode layers 3 and 3 (entire surface), between the positive electrode layers 6 and 6 (entire surface), and between the solid electrolyte layer 5 and the positive electrode active material layer 7 (only the outer peripheral edge). It is. The insulating film 2 is a continuous thin film and has a predetermined shape for constituting the first part 2a, the second part 2b, and the third part 2c. The shape in plan view of the insulating film 2 before zigzag folding has the same shape as the plan shape (before zigzag folding) in which the all solid state battery 1 shown in FIG. 3 is developed, and the first part 2a, the third part 2c, The second part 2b and the third part 2c are repeatedly arranged in this order. The number of repetitions depends on the number of layers in the all solid state battery 1. The material of the insulating film 2 is, for example, PET (polyethylene terephthalate).

  As shown in FIG. 4, the shape of the first portion 2 a of the insulating film 2 in a plan view has a rectangular shape (may be a square shape) and a convex shape on one side of the rectangular shape. A negative electrode member is bonded (evaporation, printing, thermocompression bonding, etc.) to both surfaces of the first portion 2a of the insulating film 2 to form the negative electrode layer 3, and the upper surface of the negative electrode layer 3 (only the rectangular portion) ) Is coated (coated) to form a negative electrode active material layer 4, and a solid electrolyte is coated on the upper surface of the negative electrode active material layer 4 to form a solid electrolyte layer 5.

  As shown in FIG. 4, the shape of the second part 2b portion of the insulating film 2 in plan view is a rectangular shape (may be a square shape) the same size as the first portion 2a portion, and the other side of the rectangular shape. The part has a convex shape. A positive electrode member is bonded to both surfaces of the second portion 2b of the insulating film 2 to form a positive electrode layer 6, and a positive electrode active material is applied to the upper surface (only the rectangular portion) of the positive electrode layer 6 Thus, the positive electrode active material layer 7 is formed.

  As shown in FIG. 4, the shape of the third part 2 c portion of the insulating film 2 in a plan view is a rectangular shape (or a square shape) larger in size than the first part 2 a and the second part 2 b portions. . The extent to which the size is increased depends on the thickness of the negative electrode layer 3, the negative electrode active material layer 4 and the solid electrolyte layer 5 in the first part 2a, and the positive electrode layer 6 and the positive electrode active material layer 7 in the second part 2b. It is appropriately set in consideration of the thickness and the like. In the portion of the third portion 2c of the insulating film 2, a hole 2d which is a rectangular space (portion where there is no insulating film) is formed. The size (A × B) of the hole 2d is smaller than the size of the rectangular part (active material coating part) of the first part 2a or the second part 2b. Therefore, in the third portion 2c of the insulating film 2, only the B-shaped end protection portion 2e having a predetermined width remains as the insulating film. The part connected to the first part 2a of the end protection part 2e in the third part 2c has a width longer than the thickness of the negative electrode layer 3, the negative electrode active material layer 4, and the solid electrolyte layer 5 in the first part 2a. doing. In addition, the portion of the third portion 2c that is connected to the second portion 2b of the end protection portion 2e has a width that is longer than the thickness of the positive electrode layer 6 and the positive electrode active material layer 7 in the second portion 2b. .

  The negative electrode layer 3 is a negative electrode layer disposed on both surfaces of the first part 2 a of the insulating film 2. The material of the negative electrode is a metal, for example, copper. The negative electrode layer 3 is produced in advance as a member having a predetermined thickness in the same planar shape (rectangular shape + convex shape) as the shape (rectangular shape + convex shape) of the first portion 2a of the insulating film 2 with this negative electrode material, and is folded. The negative electrode member is formed by bonding to the first portion 2a of the insulating film 2 before.

The negative electrode active material layer 4 is a negative electrode side active material layer disposed between the negative electrode layer 3 and the solid electrolyte layer 5. The material of the negative electrode active material can be appropriately selected according to the type and application of the all solid state battery 1, and examples thereof include lithium metal, lithium alloys such as Li—Al alloy and Li—In alloy, Li ₄ Ti ₅ O _{12 and the} like. Carbon materials such as lithium titanate, carbon fiber and graphite. The negative electrode active material layer 4 is formed by applying the negative electrode active material material to a rectangular portion (excluding a convex portion) on one surface of the negative electrode layer 3 before being folded. In addition, the part (convex-shaped part) where the negative electrode active material is not coated on one surface of the negative electrode layer 3 is a negative electrode uncoated part 8, and the negative electrode uncoated part 8 is a connection part to the outside. It becomes.

The solid electrolyte layer 5 is a solid electrolyte layer disposed between the negative electrode active material layer 4 and the positive electrode active material layer 7 (however, the end protection portion 2e of the insulating film 2 is interposed at the outer peripheral end). . The material of the solid electrolyte can be appropriately selected according to the type and application of the all-solid battery 1. For example, (Li ₃ PO ₄ ) x- (Li ₂ S) y- (SiS ₂ ) z glass, (Li ₂ S ) X- (SiS ₂ ) y glass, (Li ₂ S) x- (P ₂ S ₅ ) y glass, sulfide-based inorganic solid electrolytes such as crystallized glass obtained by partially crystallizing these glasses, LiTi ₂ (PO ₄ ) ₃ , NASICON type inorganic solid electrolytes such as LiZr ₂ (PO ₄ ) ₃ , LiGe ₂ (PO ₄ ) ₃ , and perovskite type oxides such as (La _{0.5 + x} Li _0.5-3x ) TiO ₃ It is a lithium ion conductive resin such as an inorganic solid electrolyte. The solid electrolyte layer 5 is formed by applying this solid electrolyte material to one surface of the negative electrode active material layer 4 before being folded.

  The positive electrode layer 6 is a positive electrode layer disposed on both surfaces of the second portion 2 b of the insulating film 2. The material of the positive electrode is a metal, for example, aluminum. The positive electrode layer 6 is produced in advance as a member having a predetermined thickness with the same planar shape (rectangular shape + convex shape) as the shape (rectangular shape + convex shape) of the second portion 2b of the insulating film 2 by using the positive electrode material, and is folded. The positive electrode member is formed by bonding to the portion of the second portion 2b of the insulating film 2 before.

  In addition, when the electrode member of a negative electrode or a positive electrode is produced in advance with the above shape by the electrode material of the negative electrode or the positive electrode, the produced electrode member may be burred. Due to the burrs of the electrode member, there is a possibility that the positive electrode side and the negative electrode side come into contact with each other and short-circuit when they are stacked. Therefore, this countermeasure against electrode flash is necessary.

The positive electrode active material layer 7 is an active material layer on the positive electrode side that is disposed between the positive electrode layer 6 and the solid electrolyte layer 5 (however, the outer peripheral end portion is interposed with the end protection portion 2e of the insulating film 2). is there. The material of the positive electrode active material can be appropriately selected according to the type and use of the all solid state battery 1. For example, transition metal chalcogenides such as titanium disulfide, molybdenum disulfide, and niobium selenide, lithium nickelate (LiNiO ₂ ), Transition metal oxides such as lithium manganate (LiMnO ₂ , LiMn ₂ O ₄ ) and lithium cobaltate (LiCoO ₂ ). The positive electrode active material layer 7 is formed by applying the positive electrode active material material to a rectangular portion (excluding a convex portion) on one surface of the positive electrode layer 6 before being folded. . In addition, the part (convex-shaped part) where the positive electrode active material is not coated on one surface of the positive electrode layer 6 is a positive electrode uncoated part 9, and the positive electrode uncoated part 9 is connected to the outside. It becomes.

  In addition, the conventionally well-known arbitrary methods are applicable to the coating (application | coating) of the active material layers 4 and 7 and the solid electrolyte layer 5 of a negative electrode or a positive electrode. The active material layers 4 and 7 may be formed only from the active material material, or may be formed by mixing a material such as a conductive material, a fixed electrolyte, and a binder as required in the active material material. . If the all-solid battery 1 can operate appropriately, the mixing ratio of these substances can be set as appropriate according to the type, application, and the like of the all-solid battery 1. Further, the solid electrolyte layer 5 may be formed only from the solid electrolyte material, or may be formed by mixing a material such as a binder with the solid electrolyte material as necessary. If the all-solid battery 1 can operate appropriately, the mixing ratio of these substances can be set as appropriate according to the type, application, etc. of the all-solid battery 1.

  The first part 2a, the third part 2c, the second part 2b, the third part 2c,..., The insulating film 2 (see FIG. 3) repeatedly arranged in this order, the first part 2a and the first part 2a. The three parts 2c, the third part 2c and the second part 2b, the second part 2b and the third part 2c,... Then, as shown in FIG. 1, the first part 2a, the third part 2c, the second part 2b, the third part 2c,... Are repeatedly stacked in this order, and the negative electrode layer 3, the negative electrode active material layer 4, the solid The electrolyte layer 5, the end protection part 2 e (third part 2 c) of the insulating film 2, the positive electrode active material layer 7, and the positive electrode layer 6 are used as one unit, and the all-solid battery 1 (no exterior film or the like) is laminated. State). The insulating film 2 is also disposed between the negative electrode layers 3 and 3 and between the positive electrode layers 6 and 6. In FIG. 1, the all-solid battery 1 includes an uppermost negative electrode layer 3, a negative electrode active material layer 4, a solid electrolyte layer 5 and a lowermost negative electrode layer 3, a negative electrode active material layer 4, and a solid electrolyte layer 5. There is no need.

  In this all solid state battery 1, the insulating film 2 is disposed between the solid electrolyte layer 5 and the positive electrode active material layer 7, but since the hole 2 d is vacant, the solid electrolyte layer 5 and the positive electrode active material layer 7. Lithium ions can move between the two. Further, in the all solid state battery 1, the insulating film 2 is disposed on the entire surface between the negative electrode layers 3 and 3 and between the positive electrode layers 6 and 6, and between the solid electrolyte layer 5 and the positive electrode active material layer 7. An end protection portion 2e of the insulating film 2 is disposed at the outer peripheral end. The insulating film 2 can protect the outer peripheral end of the all solid state battery 1 (particularly, the outer peripheral end of the active material layers 4 and 7) and can prevent a short circuit due to an electrode burr of the negative electrode or the positive electrode.

  Moreover, since only the insulating film 2 which is a single member is folded when zigzag folding, it is easy to bend correctly. Furthermore, the portion between the first portion 2a and the portion between the second portion 2b in the third portion 2c of the insulating film 2 is a play portion when being bent. Therefore, it is possible to bend accurately and easily by putting a bending slit or the like in each portion. Further, by adjusting the position of the slit or the like, the first part 2a (negative electrode layer 3, negative electrode active material layer 4, solid electrolyte layer 5), third part 2c (hole 2d, end protection part 2e), Positioning when the second part 2b (the positive electrode active material layer 7 and the positive electrode layer 6) is laminated can be accurately and easily performed.

  As shown in FIG. 2 (b), the all solid state battery 1 has all the negative electrode uncoated portions 8 joined by welding or the like and connected to the negative terminal 10, and all the positive electrode uncoated portions 9 are connected. Are coupled by welding or the like and connected to the positive electrode terminal 11. Furthermore, the all-solid-state battery 1 is packaged with an exterior film 12 such as a laminate film with only the negative electrode terminal 10 and the positive electrode terminal 11 coming out.

  A manufacturing process in the case of manufacturing the all solid state battery 1 having the above structure will be described. The insulating film 2 having the shape described above is prepared in advance using PET or the like. Moreover, the negative electrode member having the shape described above is prepared in advance using the negative electrode material. Moreover, the positive electrode member having the shape described above is prepared in advance using the positive electrode material.

  Next, for each first part 2a of the insulating film 2, a negative electrode member prepared in advance is bonded to both surfaces to form the negative electrode layer 3, and one surface of the negative electrode layer 3 (however, the negative electrode is not coated) The negative electrode active material is applied to a portion of the negative electrode active material layer 4 except for the part 8), and a solid electrolyte is applied to one surface of the negative electrode active material layer 4 to form the solid electrolyte layer 5.

  Further, for each second portion 2b of the insulating film 2, a positive electrode member is joined to both surfaces to form a positive electrode layer 6, and one surface of the positive electrode layer 6 (however, the positive electrode uncoated portion 9 portion is The positive electrode active material layer 7 is formed by coating the positive electrode active material.

  Next, between the first part 2a and the third part 2c of the insulating film 2, between the third part 2c and the second part 2b, between the second part 2b and the third part 2c, and so on. Bend sequentially and fold. Before this zigzag folding, slits for bending are provided between the first part 2a and the third part 2c, between the third part 2c and the second part 2b, and between the second part 2b and the third part 2c. Put in. All the negative electrode uncoated portions 8 are coupled and connected to the negative terminal 10, and all the positive electrode uncoated portions 9 are coupled and connected to the positive terminal 11. Finally, pressure is applied from the top and bottom and the exterior film 12 is used for exterior packaging.

  According to the all-solid battery 1, the first part 2 a (the negative electrode layer 3, the negative electrode active material layer 4, the solid electrolyte layer 5), the third part 2 c (the hole 2 d, the end protection part 2 e) are formed on the continuous insulating film 2. ), After forming the second part 2b (the positive electrode layer 6, the positive electrode active material layer 7), the structure can be manufactured by folding the continuous insulating film 2 in a zigzag manner. Easy to. In particular, the negative electrode layer 3, the negative electrode active material layer 4, and the solid electrolyte layer 5 of the first part 2a are laminated with the insulating film 2 as a reference, and the positive electrode layer 6 and the positive electrode active material layer 7 of the second part 2b are laminated. Therefore, the problem of positioning and fixing a very thin insulating film does not occur. Moreover, since it can be set as a laminated structure by folding the insulating film 2 spellingly, manufacture is easier and manufacturing speed is quicker than manufacturing by laminating | stacking all the layers. Moreover, each part (play part) between the 1st part 2a and the 3rd part 2c of the insulating film 2, between the 3rd part 2c and the 2nd part 2b, and between the 2nd part 2b and the 3rd part 2c. ), It is possible to align each layer with high accuracy and ease.

  Moreover, according to the all-solid-state battery 1, since the insulating film 2 is arrange | positioned between the solid electrolyte layer 5 and the positive electrode active material layer 7, between the negative electrode layers 3 and 3, and between the positive electrode layers 6 and 6, respectively. The insulation film 2 can prevent a short circuit due to an outer peripheral edge defect or an electrode burr of the all solid state battery 1. Moreover, according to the all-solid-state battery 1, since the insulating film 2 arrange | positioned between the solid electrolyte layer 5 and the positive electrode active material layer 7 has the hole 2d inside, the movement of lithium ions is possible. At the same time, the outer edge can be protected by the outer edge protection portion 2e.

  With reference to FIG. 5, a more preferable form in the all-solid-state battery 1 of the said structure is demonstrated. FIG. 5 is a side sectional view showing a state of accumulation of the insulating film, where (a) is a case where the sizes of the holes of the third part of the insulating film are all the same, and (b) is a third of the insulating film. This is a case where the size of the hole of the part is gradually changed.

  In the all-solid-state battery 1, a hole 2d is formed in the third portion 2c of the insulating film 2, and an end protection portion 2e having a predetermined width exists. When the insulating film 2 has a plurality of third portions 2c and the sizes of the holes 2d (A × B) of the plurality of third portions 2c are all the same, the widths of the end protection portions 2e of the plurality of third portions 2c are all Be the same. When the insulating film 2 is folded and stacked, the thickness of the insulating film 2 is accumulated by the number of the third portions 2c for the portions where the end protection portions 2e of the plurality of third portions 2c are stacked. Become. When all the sizes of the holes 2d are the same and all the end protection portions 2e have the same width W, as shown in FIG. 5A, the thickness of the insulating film 2 corresponding to the number of the third portions 2c is accumulated at the same location. It becomes one step. Since the all-solid-state battery 1 is externally restrained in a zigzag folded state, when the step becomes large (when the number of the third portions 2c increases), a large shearing force acts.

In the case of the example of FIG. 5A, a step for one film is made at the end protection portion 2e ₁ , and a step for two films is made when the end protection portion 2e ₂ is accumulated. When the protective portion 2e ₃ are accumulated can three steps of the film component can four steps of the film component when the edge protectant portion 2e ₄ are accumulated. When external restraint (pressure) is applied in a state where there is a large step, a large shearing force is generated and there is a possibility of shearing. In the case of the example shown in FIG. 5A, the portion indicated by the symbol P is sheared and the step is large, so that the negative electrode active material layer 4 and the positive electrode active material layer 7 are in contact with each other and are in a short circuit state. Note that there is a case where a short circuit does not occur even when shearing. Further, even if a large shear force is generated, the shear may not occur.

Therefore, the sizes (A × B) of the holes 2d of the plurality of third portions 2c are different from each other, and the width W of each end protection portion 2e is different. For example, the size of each hole 2d, A1>A2>A3> A4 and B1>B2>B3> If you B4, as shown in FIG. 5 (b), the width W1 <end of the edge protectant portion 2e ₁ the width W3 <width W4 of the edge protectant portion 2e ₄ width W2 <edge protectant portion 2e ₃ parts protective portion 2e _2. Thereby, the thickness of the film by the several edge part protection part 2e is not accumulated in the same location, but becomes a several small level | step difference.

In the case of the example of FIG. 5 (b), a step for one film can be made at the end protection part 2e ₁ , and when the end protection part 2e ₂ is accumulated, two steps for one film can be made, When the edge protectant portion 2e ₃ are accumulated can one step of the film component is three, it can be one of the step of film worth four when the edge protectant portion 2e ₄ are accumulated. Therefore, even if externally constrained, a large shearing force does not act because of a plurality of small steps.

  Note that how the sizes of the respective holes 2d of the plurality of third portions 2c (and consequently the widths of the end protection portions 2e) are made different can be set as appropriate. For example, the size of each hole 2d may be A1 <A2 <A3... And B1 <B2 <B3..., Or may be randomly increased rather than gradually increased or decreased. You may change it. Further, instead of changing the sizes of all the holes 2d, there may be holes 2d of the same size if there are a small number.

  As described above, the all-solid-state battery 1 is formed by changing the sizes of the holes 2d of the plurality of third portions 2c of the insulating film 2 to different sizes, so that the end protection portions 2e of the plurality of third portions 2c The shearing force due to the accumulated thickness can be suppressed and shearing can be prevented. As a result, a short circuit due to shearing can also be prevented.

  As mentioned above, although embodiment which concerns on this invention was described, this invention is implemented in various forms, without being limited to the said embodiment.

  For example, in the present embodiment, an all solid state battery is applied to a lithium ion secondary battery, but an all solid state battery may be applied to another battery. In the present embodiment, an automobile battery is used as an example of an all-solid-state battery, but it can be used in various other applications.

  Further, in the present embodiment, the fixed electrolyte layer is applied to the negative electrode active material layers on both sides of the first part, but if the fixed electrolyte layer is arranged in the hole of the third part after zigzag folding, It may be applied to two parts of the positive electrode active material layer on both sides, or may be applied to one side of the third part.

  DESCRIPTION OF SYMBOLS 1 ... All-solid-state battery, 2 ... Insulating film, 2a ... 1st part, 2b ... 2nd part, 2c ... 3rd part, 2d ... Hole, 2e ... End part protection part, 3 ... Negative electrode layer, 4 ... Negative electrode active Material layer, 5 ... Solid electrolyte layer, 6 ... Positive electrode layer, 7 ... Positive electrode active material layer, 8 ... Negative electrode uncoated part, 9 ... Positive electrode uncoated part, 10 ... Negative electrode terminal, 11 ... Positive electrode terminal, 12 ... Exterior film.

Claims (2)

A negative electrode layer is provided on both sides, a first part in which a negative electrode active material layer is applied to the negative electrode layer on each side, and a positive electrode layer is provided on both sides. An insulating member having a second part coated with a positive electrode active material layer, and a third part located between the first part and the second part and having a hole formed inside;
The first part, the third part, and the second part are laminated in order by folding the insulating member in a zigzag manner, and a solid electrolyte layer is disposed in the hole of the third part in the laminated state. All-solid battery featuring. The insulating member has a plurality of the third parts,
The all-solid-state battery according to claim 1, wherein the plurality of third portions have different hole sizes.

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