Solid-state battery processing method

Abstract

The invention relates to the technical field of solid-state batteries, and discloses a solid-state battery processing method. The solid-state battery comprises a negative electrode plate and a positive electrode plate, a solid-state electrolyte layer is arranged between the negative electrode plate and the positive electrode plate, at least one side of the negative electrode plate in the circumferential direction extends out of the edge of the positive electrode plate by a first preset width to form a to-be-processed area, and the processing method of the solid-state battery comprises the following steps: placing a printing inner frame and a printing outer frame on the solid-state electrolyte layer, the outer edge of the printing inner frame is located in the to-be-processed area, a gluing area is formed between the outer edge of the printing inner frame and the inner edge of the printing outer frame, the gluing area is set to be of a second preset width, and the second preset width is smaller than the first preset width; and glue is injected into the gluing area, so that a supporting piece is formed after the glue is cured, and the supporting piece can be arranged between the adjacent solid electrolyte layers. According to the solid-state battery processing method, the possibility of short circuit in the to-be-processed area is effectively reduced, and the safety and reliability of the solid-state battery are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state batteries, and in particular to a solid-state battery processing method. Background Art

[0002] All-solid-state batteries are batteries that use solid electrolytes, and all-solid-state batteries usually use traditional pole pieces with large negative poles and small positive poles. However, under the pressure of the solid-state battery assembly process, the shear force generated between the pole pieces where the negative pole is larger than the positive pole can easily cause the solid electrolyte layer to rupture, thus causing a short circuit problem.

[0003] Therefore, a solid-state battery processing method is urgently needed to solve the above problems. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a solid-state battery processing method, which effectively reduces the possibility of short circuit in the area to be processed and improves the safety and reliability of the solid-state battery.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A solid-state battery processing method, wherein the solid-state battery comprises a negative electrode sheet and a positive electrode sheet, wherein a solid electrolyte layer is disposed between the negative electrode sheet and the positive electrode sheet, and at least one side of the circumference of the negative electrode sheet extends beyond a first preset width of an edge of the positive electrode sheet to form an area to be processed, wherein the solid-state battery processing method comprises:

[0007] Placing a printed inner frame and a printed outer frame on the solid electrolyte layer, wherein the outer edge of the printed inner frame is located in the area to be processed, and a glue coating area is formed between the outer edge of the printed inner frame and the inner edge of the printed outer frame, and the glue coating area is set to a second preset width, and the second preset width is smaller than the first preset width;

[0008] Glue is injected into the glue-coated area so that the glue forms a support member after curing, and the support member can be placed between adjacent solid electrolyte layers.

[0009] The beneficial effects of the present invention are:

[0010] The solid-state battery of the present invention includes a negative electrode sheet and a positive electrode sheet, a solid electrolyte layer is arranged between the negative electrode sheet and the positive electrode sheet, and the negative electrode sheet extends at least one side of the circumference of the positive electrode sheet by a first preset width to form an area to be processed. When processing the above-mentioned solid-state battery, firstly, a printed inner frame and a printed outer frame are placed on the solid electrolyte layer, and a glue coating area is formed between the outer edge of the printed inner frame and the inner edge of the printed outer frame. By injecting glue into the glue coating area, the glue is solidified to form a support member that can be placed between adjacent solid electrolyte layers, and when the solid-state battery is finally pressed to form, the support member can play a certain supporting role for the solid electrolyte layer, so as to avoid the solid electrolyte layer exceeding the positive electrode sheet from rupturing during pressing and causing a short circuit. Specifically, the second preset width is set smaller than the first preset width, so that after removing the printed inner frame and the printed outer frame, the glue flows to the inner and outer sides by its own fluidity, and the size of the support member formed after flowing and solidifying can reliably support the solid electrolyte layer in the area to be processed. Furthermore, the outer edge of the printed inner frame is located in the area to be processed, that is, the outer edge of the printed inner frame is spaced apart from the outer edge of the positive electrode sheet, so that the cured support member will not affect the position of the positive electrode sheet relative to the solid electrolyte layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0012] Figure 1 It is a schematic diagram of the relationship between the negative electrode sheet, positive electrode sheet, solid electrolyte layer and the area to be processed of the solid-state battery;

[0013] Figure 2 It is a diagram of a printed inner frame and a printed outer frame of a solid-state battery processing method provided in a specific embodiment of the present invention;

[0014] Figure 3 It is a schematic diagram of the negative electrode sheet and the positive electrode sheet after the printed inner frame and the printed outer frame are removed and cured in the solid-state battery processing method provided by the specific embodiment of the present invention;

[0015] Figure 4 It is a flow chart of a solid-state battery processing method provided in a specific embodiment of the present invention.

[0016] In the figure:

[0017] 101, area to be processed; 110, negative electrode sheet; 120, positive electrode sheet; 130, solid electrolyte layer; 150, support member;

[0018] 201, glue coating area; 210, printing inner frame; 220, printing outer frame. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0021] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] like Figure 1-Figure 4As shown, this embodiment provides a solid-state battery processing method, the solid-state battery includes a negative electrode sheet 110 and a positive electrode sheet 120, a solid electrolyte layer 130 is arranged between the negative electrode sheet 110 and the positive electrode sheet 120, and the negative electrode sheet 110 extends a first preset width of the edge of the positive electrode sheet 120 on at least one side of the circumference to form a to-be-processed area 101. The solid-state battery processing method includes: placing a printed inner frame 210 and a printed outer frame 220 on the solid electrolyte layer 130, the outer edge of the printed inner frame 210 is located in the to-be-processed area 101, and a glue coating area 201 is formed between the outer edge of the printed inner frame 210 and the inner edge of the printed outer frame 220, and the glue coating area 201 is set to a second preset width, which is smaller than the first preset width; and injecting glue into the glue coating area 201 so that a support member 150 is formed after the glue is cured, and the support member 150 can be located between adjacent solid electrolyte layers 130.

[0025] When processing the above-mentioned solid-state battery, firstly, the printed inner frame 210 and the printed outer frame 220 are placed on the solid electrolyte layer 130, and a glue coating area 201 is formed between the outer edge of the printed inner frame 210 and the inner edge of the printed outer frame 220. By injecting glue into the glue coating area 201, the glue is solidified to form a support member 150 that can be placed between adjacent solid electrolyte layers 130, and when the solid-state battery is finally pressed, the support member 150 can play a certain supporting role for the solid electrolyte layer 130, so as to prevent the solid electrolyte layer 130 from breaking and short-circuiting when the part that exceeds the positive electrode sheet 120 is pressed. Specifically, the second preset width is set smaller than the first preset width, so that after removing the printed inner frame 210 and the printed outer frame 220, the glue flows to the inner and outer sides by its own fluidity, and the size of the support member 150 formed after flowing and solidification can reliably support the solid electrolyte layer 130 of the processing area 101. Furthermore, the outer edge of the printed inner frame 210 is located in the area to be processed 101, that is, the outer edge of the printed inner frame 210 is spaced apart from the outer edge of the positive electrode sheet 120, so that the cured support member 150 will not affect the position of the positive electrode sheet 120 relative to the solid electrolyte layer 130.

[0026] Specifically, the positive electrode sheet 120 includes a positive electrode current collector and a positive electrode active material layer, and the negative electrode sheet 110 includes a negative electrode current collector and a negative electrode active material layer. There is no particular limitation on the positive electrode current collector, as long as it has conductivity and does not cause adverse chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel that has been surface-treated with one of carbon, nickel, titanium, silver, etc. can be used; the negative electrode current collector can be made of copper, stainless steel, nickel, titanium, etc. In a specific embodiment, aluminum can be used for the positive electrode, and copper can be used for the negative electrode. The positive electrode active material layer includes positive electrode active materials, and the positive electrode active materials include nickel-cobalt-manganese ternary materials, lithium iron phosphate materials, lithium iron manganese phosphate materials, etc.; the negative electrode active material layer includes negative electrode active materials, and the negative electrode active materials include artificial graphite, natural graphite, silicon-based materials, etc. The solid electrolyte includes sulfides, oxides, and polymer solid electrolytes; specifically, the sulfide in the solid electrolyte can be Li 7 P 3 S 11 , Li 3 PS 4 or 80Li 2 S-20P 2 S 5 ; Polymer solid electrolytes can include polyethylene oxide PEO, polyacrylonitrile PAN, polyvinylidene fluoride PVDF, polymethyl methacrylate PMMA, polypropylene oxide PPO, polyvinylidene chloride PVDC, etc.; oxide solid electrolytes include lithium oxide, zirconium oxide, lanthanum oxide, etc.

[0027] Further, the first preset width is set to 0.6mm-5mm, and specifically can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc. The ratio of the second preset width to the first preset width is set to 0.1-0.9. If it is too small, the width of the support member 150 formed along the direction of the negative electrode sheet 110 extending out of the positive electrode sheet 120 is too narrow, and it cannot play a good supporting effect. If it is too large, the support member 150 formed is too wide, and even extends out of the edge of the negative electrode sheet 110, causing interference with subsequent assembly. Specifically, it can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0028] Preferably, in order to ensure the supporting effect of the support member 150 on the solid electrolyte layer 130, the ratio of the thickness of the support member 150 in the direction perpendicular to the solid electrolyte layer 130 to the thickness of the positive electrode sheet 120 is set to 0.7-1. If it is too small, it cannot play a good supporting role, and if it is too large, the solid electrolyte layer 130 will be crushed. Specifically, it can be 0.8, 0.9, etc. Exemplarily, the thickness of the positive electrode sheet 120 is set to 70μm-500μm.

[0029] In this embodiment, the inner edge of the printed outer frame 220 is located in the area to be processed 101 to prevent the support member 150 from protruding from the negative electrode sheet 110 after the glue is cured. Optionally, the distance between the inner edge of the printed outer frame 220 and the outer edge of the area to be processed 101 is 0-3mm to prevent the support member 150 from extending beyond the edge of the negative electrode collector 140 and occupying additional space. If the support member 150 is folded to the back side of the negative electrode sheet 110, it will also cause the negative electrode sheet 110 and the adjacent positive electrode sheet 120 to have poor contact, thereby affecting the normal use of the solid-state battery.

[0030] Specifically, after applying glue to the glue application area 201, the following steps are also performed: removing the inner printing frame 210 and the outer printing frame 220; and curing the glue to form the support member 150. It is understandable that after removing the inner printing frame 210 and the outer printing frame 220, the glue will flow to both sides after being freed from the constraints of the inner printing frame 210 and the outer printing frame 220 due to its certain fluidity. Curing is performed after removing the inner printing frame 210 and the outer printing frame 220. On the one hand, the connection between the cured glue and the inner printing frame 210 and the outer printing frame 220 can be reduced, which affects the subsequent removal of the inner printing frame 210 and the outer printing frame 220; on the other hand, the glue can also flow into the shape of the required support member 150, thereby ensuring that the preset support effect can be achieved after curing.

[0031] Therefore, the viscosity of the glue is not less than the preset viscosity to ensure that the glue has a certain fluidity and flows into a state where it can be solidified into the shape of the preset support member 150 after removing the inner printing frame 210 and the outer printing frame 220. Exemplarily, the viscosity of the glue is set to 3000 Pa.s-50000 mPa.s, and specifically can be 5000 Pa.s, 15000 Pa.s, 20000 Pa.s, 25000 Pa.s, 30000 Pa.s, 35000 Pa.s, 40000 Pa.s, 45000 Pa.s, etc.

[0032] It is worth noting that in the above-mentioned glue coating method, the glue can be a light-curing glue, the viscosity can meet the above-mentioned restrictions, and the curing time is short, only a few seconds of ultraviolet light irradiation is required, and the processing efficiency is higher. Exemplarily, the light-curing glue can include unsaturated polyester resin system, polyacid acrylate, epoxy acrylate, polyurethane acrylate, polythiol-polyene system, cationic curing base resin, etc.

[0033] In this embodiment, the negative electrode sheet 110 is arranged circumferentially beyond the positive electrode sheet 120, so the support member 150 after curing is annular. After curing, the positive electrode sheet 120 is placed inside the support member 150 to form a battery cell. In other embodiments, the positive electrode sheet 120 can also be placed on the solid electrolyte layer 130, and then the printed inner frame 210 and the printed outer frame 220 are placed, and the battery cell can also be formed.

[0034] Next, multiple battery cells are stacked in sequence to form a battery cell unit, and the battery cell unit is pressed at a preset pressure to form a solid-state battery. Optionally, the preset pressure is set to 400Mpa-800Mpa to ensure that the contact between the positive electrode sheet 120 and the negative electrode sheet 110 can meet the normal discharge of the solid-state battery. The number of stacked battery cells can be set by those skilled in the art according to actual needs, and is not specifically limited here.

[0035] It is worth noting that, under a preset pressure, the shrinkage rate of the plurality of support members 150 is greater than or equal to the shrinkage rate of the battery cell unit, so as to prevent damage to the solid electrolyte layer 130 caused by insufficient shrinkage of the support members 150 during the pressing process.

[0036] In this embodiment, after placing the printed inner frame 210 and the printed outer frame 220 on the solid electrolyte layer 130, it also includes: taking photos of the solid electrolyte layer 130, the printed inner frame 210 and the printed outer frame 220, and determining the relative positions of the printed inner frame 210 and the printed outer frame 220 by taking photos, and whether the positions of the two relative to the solid electrolyte layer 130 meet the limitations of the above-mentioned solid-state battery processing method, thereby ensuring the accuracy of subsequent glue injection. Exemplarily, a CCD camera is used to take photos, and an image processing program and a judgment program are set accordingly. The above program can be set with reference to the prior art and will not be repeated here.

[0037] Preferably, before placing the printed inner frame 210 and the printed outer frame 220 on the solid electrolyte layer 130, the process further includes: heating the printed inner frame 210 and the printed outer frame 220 to a preset temperature. By heating the printed inner frame 210 and the printed outer frame 220 before injecting the glue, it is used to ensure that the printed inner frame 210 and the printed outer frame 220 have a certain temperature, which is conducive to ensuring the fluidity of the glue and avoiding the glue being pre-cooled and solidified during the injection process, and being unable to flow to the desired state after removing the printed inner frame 210 and the printed outer frame 220. The preset temperature can be set to 40°C-200°C.

[0038] Further preferably, an insulating layer is provided on one side of the printed inner frame 210 and the printed outer frame 220 close to the solid electrolyte layer 130. By providing the insulating layer, the problem of contact short circuit between the printed inner frame 210 and the printed outer frame 220 and the negative electrode ear of the negative electrode sheet 110 is avoided, thereby improving the reliability of the processing process.

[0039] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A solid-state battery processing method, characterized in that: A solid-state battery comprises a negative electrode sheet (110) and a positive electrode sheet (120), a solid electrolyte layer (130) is arranged between the negative electrode sheet (110) and the positive electrode sheet (120), at least one side of the circumference of the negative electrode sheet (110) extends beyond a first preset width of an edge of the positive electrode sheet (120) to form a region to be processed (101), and the solid-state battery processing method comprises: A printed inner frame (210) and a printed outer frame (220) are placed on the solid electrolyte layer (130), the outer edge of the printed inner frame (210) is located in the area to be processed (101), and a glue coating area (201) is formed between the outer edge of the printed inner frame (210) and the inner edge of the printed outer frame (220), and the glue coating area (201) is set to a second preset width, and the second preset width is smaller than the first preset width; Glue is injected into the glue coating area (201) so that the glue forms a support member (150) after solidification, and the support member (150) can be placed between adjacent solid electrolyte layers (130).

2. The solid-state battery processing method according to claim 1, characterized in that: The ratio of the second preset width to the first preset width is set to 0.1-0.

9.

3. The solid-state battery processing method according to claim 1, characterized in that: After applying glue to the glue application area (201), the method further comprises: Removing the printing inner frame (210) and the printing outer frame (220); The glue is cured to form a support member (150).

4. The solid-state battery processing method according to claim 3, characterized in that: After curing, it also includes: The positive electrode sheet (120) is placed inside the support member (150) to form a battery cell.

5. The solid-state battery processing method according to claim 1, characterized in that: The negative electrode sheet (110), the solid electrolyte layer (130), the positive electrode sheet (120) and the support member (150) form a battery cell, and a plurality of the battery cell cells are stacked in sequence to form a battery cell unit, and the battery cell unit is pressed at a preset pressure to form the solid-state battery.

6. The solid-state battery processing method according to claim 5, characterized in that: Under the preset pressure, the shrinkage rate of the plurality of support members (150) is greater than or equal to the shrinkage rate of the battery cell unit.

7. The solid-state battery processing method according to claim 1, characterized in that: After placing a printed inner frame (210) and a printed outer frame (220) on the solid electrolyte layer (130), the method further includes: The solid electrolyte layer (130), the printed inner frame (210) and the printed outer frame (220) are photographed to detect the positions of the printed inner frame (210) and the printed outer frame (220) on the solid electrolyte layer (130).

8. The solid-state battery processing method according to claim 1, characterized in that: The viscosity of the glue is not less than a preset viscosity.

9. The solid-state battery processing method according to claim 1, characterized in that: Before placing the printed inner frame (210) and the printed outer frame (220) on the solid electrolyte layer (130), the method further includes: heating the printed inner frame (210) and the printed outer frame (220) to a preset temperature.

10. The solid-state battery processing method according to claim 1, characterized in that: The inner edge of the printing outer frame (220) is located in the area to be processed (101).

11. The solid-state battery processing method according to claim 10, characterized in that: The distance between the inner edge of the printing outer frame (220) and the outer edge of the area to be processed (101) is 0-3 mm.

12. The solid-state battery processing method according to claim 1, characterized in that: An insulating layer is provided on one side of the printed inner frame (210) and the printed outer frame (220) close to the solid electrolyte layer (130).

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