All-solid-state battery and preparation method thereof

Abstract

The invention provides an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive plate, a negative plate and an electrolyte layer, wherein the electrolyte layer comprises an electrolyte membrane and an insulating frame arranged on the periphery of the electrolyte membrane, and a part of the insulating frame is embedded between the positive membrane of the positive plate and the negative membrane of the negative plate. According to the all-solid-state battery provided by the invention, the insulating frame is arranged on the periphery of the electrolyte membrane in the electrolyte layer, so that in the working process of the all-solid-state battery, the electrolyte layer can be effectively prevented from being broken due to the fact that the edge of a battery cell is pressed, battery cell short circuit caused by contact of a positive plate and a negative plate is avoided, and the effect of improving the safety of the all-solid-state battery is achieved; in addition, the preparation of the electrolyte layer provided by the invention does not need an additional production process, and high-efficiency continuous production can be realized.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an all-solid-state battery and a method for preparing the same. Background Art

[0002] Against the backdrop of global climate change and energy transition, green and low-carbon development will become a key development direction for the new battery industry. Thanks to the rapid development of electric vehicles, energy storage, and consumer electronics, market demand for new energy batteries continues to grow. As the next-generation battery technology, all-solid-state batteries, with their advantages of high energy density, high safety, and long life, are currently a research focus.

[0003] At present, the battery cells in all-solid-state batteries need to be subjected to great pressure during operation. Under the action of pressure, the edges of the battery cells are prone to deformation. In severe cases, cracks will appear in the electrolyte layer, and contact is likely to occur between the positive and negative pole pieces at the cracks, causing the battery cells to short-circuit.

[0004] In the prior art, insulating material is typically added to the sides of the stacked cells to achieve insulation. However, this method adds at least one additional production step, resulting in low production efficiency and unsuitable for large-scale production. Summary of the Invention

[0005] The present invention provides an all-solid-state battery and a preparation method thereof. The all-solid-state battery is used to avoid short circuits caused by compression and deformation of the battery cell edges, thereby improving the safety of the battery. In addition, the preparation of the electrolyte layer provided by the present invention does not require the addition of additional production steps, and high-efficiency continuous production can be achieved.

[0006] In a first aspect of the present invention, an all-solid-state battery is provided, comprising: a positive electrode sheet, a negative electrode sheet, and an electrolyte layer; the electrolyte layer comprises an electrolyte membrane and an insulating frame disposed around the electrolyte membrane;

[0007] The positive electrode sheet includes a positive electrode current collector and a positive electrode film coated on the surface of the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and a negative electrode film coated on the surface of the negative electrode current collector;

[0008] A partial area of ​​the insulating frame is embedded between the positive electrode membrane and the negative electrode membrane.

[0009] According to one embodiment of the present invention, the positive electrode sheet, the electrolyte layer, and the negative electrode sheet in the all-solid-state battery are stacked in sequence;

[0010] The edge of the positive electrode membrane is flush with the electrolyte layer; the edge of the negative electrode membrane overlaps the insulating frame.

[0011] According to one embodiment of the present invention, the material of the insulating frame is an insulating material; the insulating material includes at least one of oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating material.

[0012] According to one embodiment of the present invention, the distance between the edge of the electrolyte membrane and the insulating frame is -0.1 to 0.1 mm.

[0013] According to one embodiment of the present invention, the insulating frame and the electrolyte membrane have the same thickness.

[0014] According to one embodiment of the present invention, the width of the insulating frame in any direction is 1-3 mm.

[0015] According to one embodiment of the present invention, the raw material of the electrolyte membrane is electrolyte slurry; the electrolyte slurry includes a sulfide electrolyte, a binder, and a solvent.

[0016] According to one embodiment of the present invention, the molar ratio of the sulfide electrolyte to the binder is (99.9-85):(0.1-15).

[0017] According to one embodiment of the present invention, the sulfide electrolyte slurry has a solid content of 30-80% and a viscosity of 1000-10000 mPa·s.

[0018] According to one embodiment of the present invention, the sulfide electrolyte includes Li7P3S 11 、Li3PS4、Li 10 GeP2S 12 , Li6PS5Cl and At least one of , wherein 1≤x≤1.6;

[0019] and / or, the binder comprises at least one of hydrogenated styrene-butadiene block copolymer, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluororubber and ethylene-propylene rubber;

[0020] And / or, the solvent includes at least one of toluene, xylene, heptane, octane and isobutyl ether.

[0021] A second aspect of the present invention provides a method for preparing the above-mentioned all-solid-state battery, comprising:

[0022] Using a coating device to intermittently coat a pre-configured electrolyte slurry on a coating substrate to form an electrolyte membrane, and coating an insulating material around the electrolyte membrane to form an insulating frame;

[0023] Drying the electrolyte membrane and the insulating frame to obtain a pre-prepared electrolyte;

[0024] Compounding the pre-prepared electrolyte with the positive electrode sheet to obtain a composite electrode sheet of the positive electrode and the electrolyte;

[0025] The composite electrode sheet is die-cut, and the die-cut composite electrode sheet is stacked with the negative electrode sheet to obtain the all-solid-state battery, wherein a partial area of ​​the insulating frame in the all-solid-state battery is embedded between the positive electrode diaphragm in the positive electrode sheet and the negative electrode diaphragm of the negative electrode sheet.

[0026] According to one embodiment of the present invention, the method of intermittently coating a pre-configured electrolyte slurry on a coating substrate using a coating device to form an electrolyte membrane, and coating an insulating material around the electrolyte membrane to form an insulating frame, includes:

[0027] Using the first die head of the coating equipment to intermittently coat the pre-configured electrolyte slurry on the coating substrate to form an electrolyte membrane, and coating the insulating material on both sides of the coating substrate in the direction of movement;

[0028] The insulating material is applied to the gaps of the electrolyte membrane using a second die head of a coating device to form the insulating frame.

[0029] According to one embodiment of the present invention, the step of drying the electrolyte membrane and the insulating frame includes:

[0030] If the insulating frame is made of only solvent-based insulating material, a drying oven is used to dry the electrolyte membrane and the insulating frame simultaneously;

[0031] If the material of the insulating frame includes a thermosetting insulating material, a drying oven is used to dry the electrolyte membrane, and a thermosetting device is used to cure the insulating frame;

[0032] If the material of the insulating frame includes a light-curing insulating material, a drying oven is used to dry the electrolyte slurry, and a light-curing device is used to cure the insulating frame.

[0033] According to one embodiment of the present invention, the coating substrate is one of aluminum foil, copper foil, stainless steel foil, polyethylene terephthalate film, and polypropylene film.

[0034] According to an embodiment of the present invention, the insulating material includes at least one of oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating material.

[0035] According to one embodiment of the present invention, when the insulating material is coated on both sides along the moving direction of the coating substrate, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm;

[0036] and / or,

[0037] When the insulating material is applied at the gaps of the electrolyte membrane, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm.

[0038] According to one embodiment of the present invention, the insulating frame and the electrolyte membrane have the same thickness.

[0039] According to one embodiment of the present invention, the width of the insulating material coated on both sides along the direction of movement of the coated substrate is 1 to 3 mm;

[0040] and / or,

[0041] The width of the insulating material applied at the gaps of the electrolyte membrane is 2 to 8 mm.

[0042] A third aspect of the present invention provides an electrical device comprising an electrical device body and the above-mentioned all-solid-state battery.

[0043] The implementation of the present invention has at least the following beneficial effects:

[0044] In the electrolyte layer of the all-solid-state battery, an insulating frame is provided around the electrolyte membrane, so that during the operation of the all-solid-state battery, the electrolyte layer can be effectively prevented from being ruptured due to pressure on the edge of the battery cell, thereby avoiding the short circuit of the battery cell caused by contact between the positive and negative electrodes, thereby achieving the effect of improving the safety of the all-solid-state battery; in addition, the preparation of the electrolyte layer provided by the present invention does not require the addition of additional production processes, and can achieve high-efficiency continuous production, thereby ensuring the production efficiency of the all-solid-state battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0046] Figure 1 This is a schematic diagram of the assembly of the all-solid-state battery cell provided by the present invention;

[0047] Figure 2 A schematic flow chart of a method for preparing the above-mentioned all-solid-state battery is provided for the second embodiment of the present invention;

[0048] Figure 3 A schematic diagram of coating of the first die head provided by the present invention;

[0049] Figure 4This is a schematic diagram of coating of the second die head provided by the present invention.

[0050] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

[0051] Description of reference numerals:

[0052] 201: positive electrode current collector; 202: positive electrode membrane; 203: negative electrode current collector; 204: negative electrode membrane; 205: electrolyte membrane; 206: insulating frame; 301: coating substrate. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below. The specific embodiments listed below are only for describing the principles and features of the present invention. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts are within the scope of protection of the present invention.

[0054] Based on the introduction of the above background technology, a first embodiment of the present invention provides an all-solid-state battery, including: a positive electrode sheet, a negative electrode sheet and an electrolyte layer, wherein the electrolyte layer includes an electrolyte membrane and an insulating frame arranged around the electrolyte membrane.

[0055] Among them, the positive electrode sheet includes a positive electrode collector and a positive electrode membrane coated on the surface of the positive electrode collector; the negative electrode sheet includes a negative electrode collector and a negative electrode membrane coated on the surface of the negative electrode collector; part of the insulating frame is embedded between the positive electrode membrane and the negative electrode membrane.

[0056] According to the inventors' research, the rupture of the electrolyte membrane under pressure in an all-solid-state battery is usually caused by the shear force exerted on it by the smaller membrane (positive membrane or negative membrane) among the adjacent membranes. The inventors consider that by providing an insulating frame on all four sides of the electrolyte membrane in the electrolyte layer between the positive and negative electrodes, and embedding part of the insulating frame between the positive and negative electrodes, the point of force exerted on the electrolyte membrane by the smaller membrane is changed to the insulating frame. This can prevent the edge of the electrolyte layer in the battery cell from rupturing due to battery pressure, and can avoid the occurrence of safety accidents caused by short circuits between the positive and negative electrodes. At the same time, because the insulating frame can be applied simultaneously during the electrolyte membrane coating stage, there is no need to add additional production steps, and continuous production is possible. In terms of the technology of achieving the effect of producing batteries that avoid short circuits between the positive and negative electrodes, the production efficiency of the battery is guaranteed.

[0057] In some possible embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode film coated on the surface of the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and a negative electrode film coated on the surface of the negative electrode current collector; the positive electrode sheet, the electrolyte layer, and the negative electrode sheet in the all-solid-state battery are stacked in sequence;

[0058] The edge of the positive electrode membrane is flush with the electrolyte layer; the edge of the negative electrode membrane overlaps the insulating frame.

[0059] As an example, Figure 1 This is a schematic diagram of the assembly of the all-solid-state battery cell provided by the present invention, as shown in FIG. Figure 1 As shown, in an all-solid-state battery cell, a positive electrode film 202 is coated on both sides of the positive electrode current collector 201 of the positive electrode sheet, a negative electrode film 204 is coated on one side of the negative electrode current collector 203 of the negative electrode sheet, and an insulating frame 206 is provided around the electrolyte membrane 205 of the electrolyte layer. The edge of the positive electrode film 202 is flush with the electrolyte layer; the edge of the negative electrode film 204 overlaps the insulating frame.

[0060] It should be understood that since the edge of the positive electrode diaphragm needs to be flush with the electrolyte layer; the edge of the negative electrode diaphragm overlaps the insulating frame, therefore, the length of the electrolyte membrane is smaller than the length of the negative electrode diaphragm, and the length of the negative electrode diaphragm is smaller than the length of the positive electrode diaphragm, the width of the electrolyte membrane is smaller than the width of the negative electrode diaphragm, and the width of the negative electrode diaphragm is smaller than the width of the positive electrode diaphragm. At the same time, the length of the positive electrode diaphragm is the sum of the length of the electrolyte membrane and the width of the upper and lower borders of the electrolyte membrane, and the width of the positive electrode diaphragm is the sum of the width of the electrolyte membrane and the width of the left and lower borders of the insulating frame.

[0061] Such a setting can effectively avoid short circuit between the positive and negative electrodes, thereby improving the safety of the battery.

[0062] In a possible implementation, the insulating frame is made of insulating material.

[0063] Optionally, the insulating material includes at least one of an oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, ultraviolet (UV) curing monomer, UV curing resin, and a fiber-type insulating material.

[0064] Specifically, the insulating material can be any one of oxide-type insulating materials, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating materials, or it can be a combination of any multiple of the above substances. For example, it can be a combination of two, three or more substances. This is not specifically limited in the embodiments of the present invention.

[0065] Examples of oxide-type insulating materials include aluminum oxide, magnesium oxide, etc. Examples of fiber-type insulating materials include ceramic fiber, aramid fiber, and glass fiber.

[0066] In a possible implementation, the distance between the edge of the electrolyte membrane and the insulating frame is -0.1 to 0.1 mm.

[0067] Exemplarily, the distance between the edge of the electrolyte membrane and the insulating frame is -0.1mm, -0.08mm, -0.06mm, -0.04mm, -0.02mm, 0mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, or any two of the foregoing values ​​are selected to form a new range, and the value taken within the new range.

[0068] In a possible implementation manner, the thickness of the insulating frame is the same as that of the electrolyte membrane.

[0069] It should be understood that the same thickness of the insulating frame and the electrolyte membrane can ensure that the internal structure of the battery is flat and uniform, making the contact interface between the positive and negative electrodes and the electrolyte layer more uniform.

[0070] In a possible implementation manner, the width of the insulating frame in any direction is 1-3 mm.

[0071] Exemplarily, the width of the insulating frame in any direction is 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, or any two of the foregoing values ​​are selected to form a new range, and the value taken within the new range.

[0072] It should be understood that if the width of the insulating frame is too large, it will affect the overall energy density of the battery; if the width of the insulating frame is too small, it will be difficult to achieve the technical effect of preventing the positive and negative electrodes from shorting. Therefore, the appropriate width of the insulating frame is key to ensuring excellent battery performance.

[0073] In a possible embodiment, the raw material of the electrolyte membrane is electrolyte slurry; wherein the electrolyte slurry includes a sulfide electrolyte, a binder, and a solvent.

[0074] Optionally, the molar ratio of the sulfide electrolyte to the binder is (99.9~85):(0.1~15).

[0075] Exemplarily, the molar ratio of the sulfide electrolyte to the binder is 99.9:0.1, 98:2, 97:3, 96:4, 95:5, 94:6, 93:7, 92:8, 91:9, 90:10, 89:11, 88:12, 87:13, 86:4, 85:5, etc., which are values ​​within the range of (99.9~85):(0.1~15). The present invention does not limit the specific value of the molar ratio of the sulfide electrolyte to the binder.

[0076] It should be understood that the molar ratio range of the sulfide electrolyte and the binder provided by the present invention can take into account both the lithium ion conductivity and the mechanical strength of the sulfide electrolyte membrane.

[0077] Optionally, the sulfide electrolyte slurry has a solid content of 30% to 80% and a viscosity of 1,000 to 10,000 mPa·s. The solid content is determined by the solvent content in the sulfide electrolyte slurry, which refers to the ratio of the sulfide electrolyte to the binder in the sulfide electrolyte slurry.

[0078] For example, the solid content of the sulfide electrolyte slurry is, for example, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or any two of the foregoing values ​​are selected to form a new range, and the value taken within the new range; the viscosity is, for example, 1000 mPa·s, 2000 mPa·s, 3000 mPa·s, 4000 mPa·s, 5000 mPa·s, 6000 mPa·s, 7000 mPa·s, 8000 mPa·s, 9000 mPa·s, 10000 mPa·s, or any two of the foregoing values ​​are selected to form a new range, and the value taken within the new range.

[0079] It should be understood that the solid content and viscosity provided by the present invention can ensure better fluidity during coating and uniformity of the electrolyte membrane.

[0080] Optionally, sulfide electrolytes include Li7P3S 11 、Li3PS4、Li 10 GeP2S 12 , Li6PS5Cl and At least one of , wherein 1≤x≤1.6.

[0081] Optionally, the binder includes at least one of hydrogenated styrene-butadiene block copolymer, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluororubber and ethylene-propylene rubber.

[0082] Specifically, the binder can be any one of hydrogenated styrene-butadiene block copolymer, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluororubber and ethylene-propylene rubber, or it can be a combination of any multiple of the above substances. For example, it can be a combination of two, three or more substances. This embodiment of the present invention does not make specific limitations on this. Such an arrangement can effectively improve the versatility of the electrolyte membrane.

[0083] Optionally, the solvent includes at least one of toluene, xylene, heptane, octane and isobutyl ether.

[0084] Specifically, the solvent can be any one of toluene, xylene, heptane, octane and isobutyl ether, or it can be a combination of any multiple of the above substances. For example, it can be a combination of two, three or more substances. This embodiment of the present invention does not make specific limitations on this. Such a setting can effectively improve the versatility of the electrolyte membrane.

[0085] It should be understood that the solvent provided by the present invention has little side reaction with the electrolyte and can maintain the ionic conductivity of the electrolyte.

[0086] The present invention provides an insulating frame around the electrolyte membrane in the electrolyte layer of the all-solid-state battery, so that during the operation of the all-solid-state battery, the electrolyte layer can be effectively prevented from being ruptured due to pressure on the edge of the battery cell, thereby avoiding short circuit of the battery cell caused by contact between the positive and negative electrodes, thereby achieving the effect of improving the safety of the all-solid-state battery; in addition, the preparation of the electrolyte layer provided by the present invention does not require the addition of additional production processes, and high-efficiency continuous production can be achieved, which can ensure the production efficiency of the all-solid-state battery.

[0087] Figure 2 The second embodiment of the present invention provides a schematic flow chart of a method for preparing the above-mentioned all-solid-state battery, which is used to prepare the above-mentioned all-solid-state battery, such as Figure 2 As shown, the preparation method provided in this embodiment includes:

[0088] S101, using a coating device to intermittently coat a pre-configured electrolyte slurry on a coating substrate to form an electrolyte membrane, and coating an insulating material around the electrolyte membrane to form an insulating frame.

[0089] Optionally, the coating substrate may be one of aluminum foil, copper foil, stainless steel foil, polyethylene terephthalate (PET) film, and polypropylene (PP) film.

[0090] In this step, the electrolyte membrane and the insulating frame need to be coated on a coating machine substrate, wherein the insulating frame is coated around the electrolyte membrane.

[0091] In a possible implementation, step S101 may be implemented using the following steps:

[0092] Step 1011 : Use the first die head of the coating equipment to intermittently coat the pre-configured electrolyte slurry on the coating substrate to form an electrolyte membrane, and coat the insulating material on both sides of the coating substrate in the direction of movement.

[0093] Specifically, the coating device used in this implementation is provided with a first membrane head and a second membrane head. Figure 3 The coating schematic diagram of the first die head provided by the present invention is as follows: Figure 3 As shown, first, the first die head is used to intermittently coat the electrolyte membrane 205 on the coating substrate 301, and insulating material is coated on both sides along the moving direction of the coating substrate to form the upper and lower frames of the insulating frame 206.

[0094] Optionally, the insulating material includes at least one of oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating material.

[0095] Optionally, when the insulating material is coated on both sides along the moving direction of the coating substrate, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm.

[0096] Optionally, the width of the insulating material coated on both sides along the direction of movement of the coated substrate is 1-3 mm. For example, the width of the insulating material coated on both sides along the direction of movement of the coated substrate is, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, or 3 mm, or any two of the foregoing values ​​can be selected to form a new range, and the value taken within the new range can be selected.

[0097] Step 1012: Use the second die head of the coating equipment to coat the insulating material at the gaps of the electrolyte membrane to form an insulating frame.

[0098] Figure 4 The coating schematic diagram of the second die head provided by the present invention is as follows: Figure 4 As shown, in this step, a second film head is used to apply insulating material to the gaps of the electrolyte membrane 205 to form the left and right frames of the insulating frame 206 .

[0099] Optionally, the width of the insulating material applied at the gaps in the electrolyte membrane is 2 to 8 mm. For example, the width of the insulating material applied at the gaps in the electrolyte membrane is 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm, or any two of the aforementioned values ​​can be selected to form a new range, and the value taken within the new range can be selected.

[0100] Optionally, when the insulating material is coated at the gaps of the electrolyte membrane, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm.

[0101] The coating method provided by this implementation method realizes the coating of insulating material and electrolyte slurry through the cooperation of dual die heads, effectively ensuring the production efficiency of the electrolyte layer and providing a basis for large-scale production of batteries.

[0102] In a possible implementation, the raw material of the electrolyte membrane is electrolyte slurry; the electrolyte slurry includes a sulfide electrolyte, a binder, and a solvent.

[0103] Optionally, the molar ratio of the sulfide electrolyte to the binder is (99.9~85): (0.1~15).

[0104] Optionally, the sulfide electrolyte slurry has a solid content of 30-80% and a viscosity of 1000-10000 mPa·s.

[0105] Optionally, the sulfide electrolyte includes Li7P3S 11 、Li3PS4、Li 10 GeP2S 12 , Li6PS5Cl and At least one of , wherein 1≤x≤1.6;

[0106] Optionally, the binder includes at least one of hydrogenated styrene-butadiene block copolymer, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluororubber and ethylene-propylene rubber.

[0107] Optionally, the solvent includes at least one of toluene, xylene, heptane, octane and isobutyl ether.

[0108] S102: Drying the electrolyte membrane and the insulating frame to obtain a pre-prepared electrolyte.

[0109] After coating is completed, the electrolyte membrane and the insulating frame need to be dried to obtain the pre-prepared electrolyte.

[0110] In a possible implementation, step S102 may be implemented using the following method:

[0111] If the material of the insulating frame is only solvent-based insulating material, a drying oven is used to dry the electrolyte membrane and the insulating frame at the same time; if the material of the insulating frame includes thermosetting insulating material, a drying oven is used to dry the electrolyte membrane, and a thermosetting device is used to cure the insulating frame; if the material of the insulating frame includes photocuring insulating material, a drying oven is used to dry the electrolyte slurry, and a photocuring device is used to cure the insulating frame.

[0112] Examples of solvent-based insulating materials include polyethylene and polyvinyl chloride; examples of light-curing insulating materials include UV-curing monomers and UV-curing rubber; and examples of heat-curing insulating materials include heat-curing resins.

[0113] This implementation provides a corresponding drying process for different specific insulation materials. In a specific implementation, for insulation frames that require heat curing and / or light curing, continuous belt conveyor technology can be used to directly perform the curing process after the solvent is dried, achieving continuous production and ensuring high production efficiency.

[0114] S103 , compounding the pre-prepared electrolyte with the positive electrode sheet to obtain a composite electrode sheet of the positive electrode and the electrolyte.

[0115] In a specific implementation, the pre-prepared electrolyte can be coated on the surface of the positive electrode plate by roll-to-roll rolling to obtain a composite plate of the positive electrode and the electrolyte.

[0116] S104, die-cutting the composite electrode sheet, and laminating the die-cut composite electrode sheet with the negative electrode sheet to obtain an all-solid-state battery.

[0117] Among them, part of the insulating frame in the all-solid-state battery is embedded between the positive electrode membrane in the positive electrode sheet and the negative electrode membrane in the negative electrode sheet.

[0118] In this step, the composite electrode sheet is die-cut and the die-cut composite electrode sheet is stacked with the negative electrode sheet to obtain an all-solid-state battery.

[0119] It should be noted that when the pre-prepared electrolyte is combined with the positive electrode sheet to form a composite electrode sheet, and in the process of stacking the composite electrode sheet and the negative electrode sheet, part of the insulating frame should be embedded between the positive electrode membrane in the positive electrode sheet and the negative electrode membrane in the negative electrode sheet.

[0120] The preparation method of the all-solid-state battery provided in this embodiment is to first use a coating device to intermittently coat a pre-configured electrolyte slurry on a coating substrate to form an electrolyte membrane, and coat an insulating material around the electrolyte membrane to form an insulating frame, then dry the electrolyte membrane and the insulating frame to obtain a pre-prepared electrolyte, then compound the pre-prepared electrolyte with the positive electrode sheet to obtain a composite electrode sheet of the positive electrode and the electrolyte, finally die-cut the composite electrode sheet, and stack the die-cut composite electrode sheet with the negative electrode sheet to obtain the means of the all-solid-state battery, and simultaneously coat the insulating frame during the electrolyte membrane coating stage, without adding additional production processes, and can be produced continuously, thereby ensuring the production efficiency of the battery in terms of technology for achieving the effect of producing an all-solid-state battery that avoids short-circuiting of the positive and negative electrodes.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An all-solid-state battery, characterized in that: The all-solid-state battery comprises: a positive electrode sheet, a negative electrode sheet and an electrolyte layer; the electrolyte layer comprises an electrolyte membrane and an insulating frame arranged around the electrolyte membrane; The positive electrode sheet includes a positive electrode current collector and a positive electrode film coated on the surface of the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and a negative electrode film coated on the surface of the negative electrode current collector; A partial area of ​​the insulating frame is embedded between the positive electrode membrane and the negative electrode membrane.

2. The all-solid-state battery according to claim 1, characterized in that The positive electrode sheet, the electrolyte layer and the negative electrode sheet in the all-solid-state battery are stacked in sequence; The edge of the positive electrode membrane is flush with the electrolyte layer; the edge of the negative electrode membrane overlaps the insulating frame.

3. The all-solid-state battery according to claim 1 or 2, characterized in that: The insulating frame is made of insulating material; the insulating material includes at least one of oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating material.

4. The all-solid-state battery according to claim 1 or 2, characterized in that: The distance between the edge of the electrolyte membrane and the insulating frame is -0.1 to 0.1 mm.

5. The all-solid-state battery according to claim 1 or 2, characterized in that: The insulating frame has the same thickness as that of the electrolyte membrane.

6. The all-solid-state battery according to claim 1 or 2, characterized in that: The width of the insulating frame in any direction is 1-3 mm.

7. The all-solid-state battery according to claim 1 or 2, characterized in that: The raw material of the electrolyte membrane is electrolyte slurry; the electrolyte slurry includes sulfide electrolyte, binder and solvent.

8. The all-solid-state battery according to claim 7, characterized in that: The molar ratio of the sulfide electrolyte to the binder is (99.9-85): (0.1-15).

9. The all-solid-state battery according to claim 7, characterized in that: The sulfide electrolyte slurry has a solid content of 30-80% and a viscosity of 1000-10000 mPa·s.

10. The all-solid-state battery according to claim 7, characterized in that: The sulfide electrolyte includes Li7P3S 11 、Li3PS4、Li 10 GeP2S 12 , Li6PS5Cl and At least one of , wherein 1≤x≤1.6; and / or, the binder comprises at least one of hydrogenated styrene-butadiene block copolymer, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluororubber and ethylene-propylene rubber; And / or, the solvent includes at least one of toluene, xylene, heptane, octane and isobutyl ether.

11. A method for preparing an all-solid-state battery according to any one of claims 1 to 10, characterized in that: The method comprises: Using a coating device to intermittently coat a pre-configured electrolyte slurry on a coating substrate to form an electrolyte membrane, and coating an insulating material around the electrolyte membrane to form an insulating frame; Drying the electrolyte membrane and the insulating frame to obtain a pre-prepared electrolyte; Compounding the pre-prepared electrolyte with the positive electrode sheet to obtain a composite electrode sheet of the positive electrode and the electrolyte; The composite electrode sheet is die-cut, and the die-cut composite electrode sheet is stacked with the negative electrode sheet to obtain the all-solid-state battery, wherein a partial area of ​​the insulating frame in the all-solid-state battery is embedded between the positive electrode diaphragm in the positive electrode sheet and the negative electrode diaphragm of the negative electrode sheet.

12. The method according to claim 11, characterized in that The method comprises: intermittently coating a pre-configured electrolyte slurry on a coating substrate using a coating device to form an electrolyte membrane, and coating an insulating material around the electrolyte membrane to form an insulating frame, comprising: Using the first die head of the coating equipment to intermittently coat the pre-configured electrolyte slurry on the coating substrate to form an electrolyte membrane, and coating the insulating material on both sides of the coating substrate in the direction of movement; The insulating material is applied to the gaps of the electrolyte membrane using a second die head of a coating device to form the insulating frame.

13. The method according to claim 11 or 12, characterized in that The step of drying the electrolyte membrane and the insulating frame comprises: If the insulating frame is made of only solvent-based insulating material, a drying oven is used to dry the electrolyte membrane and the insulating frame simultaneously; If the material of the insulating frame includes a thermosetting insulating material, a drying oven is used to dry the electrolyte membrane, and a thermosetting device is used to cure the insulating frame; If the material of the insulating frame includes a light-curing insulating material, a drying oven is used to dry the electrolyte slurry, and a light-curing device is used to cure the insulating frame.

14. The method according to claim 11 or 12, characterized in that The coating substrate is one of aluminum foil, copper foil, stainless steel foil, polyethylene terephthalate film and polypropylene film.

15. The method according to claim 11 or 12, characterized in that The insulating material includes at least one of oxide-type insulating material, polyethylene, polyvinyl chloride, rubber, epoxy resin, thermosetting resin, UV-curing monomer, UV-curing resin, and fiber-type insulating material.

16. The method according to claim 12, characterized in that When the insulating material is coated on both sides of the coating substrate in the direction of movement, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm; and / or, When the insulating material is applied at the gaps of the electrolyte membrane, the distance between the edge of the electrolyte membrane and the insulating material is -0.1 to 0.1 mm.

17. The method according to claim 11 or 12, characterized in that The insulating frame has the same thickness as that of the electrolyte membrane.

18. The method according to claim 12, characterized in that The width of the insulating material coated on both sides along the direction of movement of the coated substrate is 1 to 3 mm; and / or, The width of the insulating material applied at the gaps of the electrolyte membrane is 2 to 8 mm.

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