Solid-state battery processing method

Abstract

The present application relates to the technical field of solid-state battery, and discloses a solid-state battery processing method. The solid-state battery comprises a negative electrode sheet and a positive electrode sheet, and a solid-state electrolyte layer is arranged between the negative electrode sheet and the positive electrode sheet. The circumferential side of the negative electrode sheet extends out of the edge of the positive electrode sheet by a first preset width to form a to-be-processed area. The solid-state battery processing method 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, and a glue coating area is formed between the outer edge of the printing inner frame and the inner edge of the printing outer frame, the glue coating area is set as a second preset width, and the second preset width is smaller than the first preset width; and glue is injected into the glue coating area, so that a support is formed after the glue is cured, and the support can be arranged between adjacent solid-state electrolyte layers. The solid-state battery processing method effectively reduces the possibility of short circuit in the to-be-processed area, and improves the safety and reliability of the solid-state battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid-state batteries, in particular to a solid-state battery processing method. BACKGROUND

[0002] A solid-state battery is a battery using a solid-state electrolyte, and the solid-state battery usually adopts a traditional electrode tab with a large negative electrode and a small positive electrode. However, under the pressing effect in the solid-state battery assembly process, the shear force generated between the electrode tab with the negative electrode larger than the positive electrode can easily cause the solid-state electrolyte layer to break, thereby causing a short circuit problem.

[0003] Therefore, there is an urgent need for a solid-state battery processing method to solve the above problems. SUMMARY

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

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] The solid-state battery processing method, the solid-state battery includes a negative electrode tab and a positive electrode tab, a solid-state electrolyte layer is arranged between the negative electrode tab and the positive electrode tab, and the circumferential side of the negative electrode tab extends out of the edge of the positive electrode tab by a first preset width to form a processing area. The solid-state battery processing method comprises:

[0007] Placing a printed inner frame and a printed outer frame on the solid-state electrolyte layer, the outer edge of the printed inner frame is located in the processing area, 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, the glue coating area is set as a second preset width, and the second preset width is smaller than the first preset width;

[0008] Glue is injected into the glue coating area to form a support after the glue is cured, and the support can be placed between adjacent solid-state electrolyte layers.

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

[0010] The solid-state battery of the present application comprises a negative electrode sheet and a positive electrode sheet, and a solid-state electrolyte layer is arranged between the negative electrode sheet and the positive electrode sheet. The edge of the negative electrode sheet extends beyond the edge of the positive electrode sheet by a first preset width in the circumferential direction to form a to-be-processed area. When processing the above-mentioned solid-state battery, first, a printing inner frame and a printing outer frame are placed on the solid-state electrolyte layer. A glue coating area is formed between the outer edge of the printing inner frame and the inner edge of the printing outer frame. By injecting glue into the glue coating area, the glue can form a support element after curing, which can be placed between adjacent solid-state electrolyte layers. When the solid-state battery is finally pressed, the support element can provide certain support to the solid-state electrolyte layer, thereby preventing the solid-state electrolyte layer from being broken and causing short circuit when the part of the solid-state electrolyte layer beyond the positive electrode sheet is pressed. Specifically, the second preset width is smaller than the first preset width, so that after the printing inner frame and the printing outer frame are removed, the glue flows to the inner and outer sides by its own flowability. After flowing and curing, the size of the support element can reliably support the solid-state electrolyte layer of the to-be-processed area. Further, the outer edge of the printing inner frame is located in the to-be-processed area, i.e., the outer edge of the printing inner frame is arranged at a distance from the outer edge of the positive electrode sheet, so that the cured support element does not affect the position of the positive electrode sheet relative to the solid-state electrolyte layer. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and these drawings.

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

[0013] Figure 2 is a diagram of the printing inner frame and the printing outer frame provided by the solid-state battery processing method of the specific embodiment of the present application;

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

[0015] Figure 4 is a flowchart of the solid-state battery processing method provided by the specific embodiment of the present application.

[0016] In the drawings:

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

[0018] 201, gluing area; 210, inner printed frame; 220, outer printed frame. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters in the drawings represent the same or like elements among which detailed descriptions are not repeatedly rendered. The embodiments described below are exemplary, and are intended to explain the present application, and are not intended to limit the present application.

[0020] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, 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 explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "over" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] The technical solutions of the present application are further illustrated below in conjunction with the drawings and through specific embodiments.

[0024] As Figures 1-4As shown, the 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-state electrolyte layer 130 is arranged between the negative electrode sheet 110 and the positive electrode sheet 120, and the negative electrode sheet 110 extends outward from the edge of the positive electrode sheet 120 by a first preset width in the circumferential direction to form a to-be-processed area 101. The solid-state battery processing method comprises the following steps: placing a printed inner frame 210 and a printed outer frame 220 on the solid-state electrolyte layer 130, the outer edge of the printed inner frame 210 is located in the to-be-processed area 101, and a glue applying area 201 is formed between the outer edge of the printed inner frame 210 and the inner edge of the printed outer frame 220, the glue applying area 201 is arranged to have a second preset width, and the second preset width is smaller than the first preset width; and injecting glue into the glue applying area 201 to form a support 150 after the glue is cured, and the support 150 can be located between adjacent solid-state electrolyte layers 130.

[0025] When processing the above-mentioned solid-state battery, first, the printed inner frame 210 and the printed outer frame 220 are placed on the solid-state electrolyte layer 130, the glue applying 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 support 150 which can be placed between adjacent solid-state electrolyte layers 130 is formed by injecting glue into the glue applying area 201 and allowing the glue to cure. When the solid-state battery is finally pressed, the support 150 can provide certain support to the solid-state electrolyte layer 130, thereby avoiding the situation that the part of the solid-state electrolyte layer 130 which exceeds the positive electrode sheet 120 is broken during pressing and causes short circuit. Specifically, the second preset width is smaller than the first preset width, so that after the printed inner frame 210 and the printed outer frame 220 are removed, the glue flows to the inner and outer sides by relying on its own flowability, and the size of the support 150 formed after flowing and curing can reliably support the solid-state electrolyte layer 130 of the to-be-processed area 101. Further, the outer edge of the printed inner frame 210 is located in the to-be-processed area 101, i.e., the outer edge of the printed inner frame 210 is arranged in a spaced manner with the outer edge of the positive electrode sheet 120, so that the cured support 150 does not affect the position of the positive electrode sheet 120 relative to the solid-state 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. The positive electrode current collector is not particularly limited as long as it has electrical conductivity without causing adverse chemical changes in the battery, and for example, stainless steel, aluminum, nickel, titanium, baked carbon, or aluminum or stainless steel 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 specific embodiments, the positive electrode can be made of aluminum, and the negative electrode can be made of copper. The positive electrode active material layer includes a positive electrode active material, and the positive electrode active material includes nickel-cobalt-manganese ternary material, lithium iron phosphate material, lithium manganese iron phosphate material, etc.; the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material includes artificial graphite, natural graphite, silicon-based material, etc. The solid-state electrolyte includes sulfide, oxide, and polymer solid-state electrolyte; specifically, the sulfide in the solid-state electrolyte can be Li7P3S 11 , Li3PS4, or 80Li2S-20P2S5; the polymer solid-state electrolyte can be polyethylene oxide PEO, polyacrylonitrile PAN, polyvinylidene fluoride PVDF, polymethyl methacrylate PMMA, polypropylene oxide PPO, polyvinylidene chloride PVDC, etc.; the oxide solid-state electrolyte includes 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, too small, the width of the support piece 150 extending out of the positive electrode sheet 120 along the negative electrode sheet 110 is too narrow, and cannot play a better supporting effect, too large, the support piece 150 formed is too wide, and even extends out of the edge of the negative electrode sheet 110, causing interference in subsequent assembly. Specifically, it can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0028] Preferably, to ensure the supporting effect of the support piece 150 on the solid-state electrolyte layer 130, the ratio of the thickness of the support piece 150 in the direction perpendicular to the solid-state electrolyte layer 130 to the thickness of the positive electrode sheet 120 is set to 0.7-1, too small, and cannot play a better supporting effect, too large, and will crush the solid-state electrolyte layer 130, and specifically can be 0.8, 0.9, etc. Illustratively, 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 to-be-processed area 101, avoiding the support 150 protruding from the negative plate 110 after the glue solidifies. Optionally, the distance between the inner edge of the printed outer frame 220 and the outer edge of the to-be-processed area 101 is 0-3 mm, avoiding the support 150 extending out of the edge of the negative current collector 140, occupying additional space, and if the support 150 is folded to the back side of the negative plate 110, it will also cause the negative plate 110 and the adjacent positive plate 120 to not contact well, thereby affecting the normal use of the solid-state battery.

[0030] Specifically, after the glue is applied to the gluing area 201, the printed inner frame 210 and the printed outer frame 220 are removed, and the glue is solidified to form the support 150. It can be understood that after the printed inner frame 210 and the printed outer frame 220 are removed, the glue flows to both sides due to its certain fluidity after being released from the constraint of the printed inner frame 210 and the printed outer frame 220. After the printed inner frame 210 and the printed outer frame 220 are removed, solidification is performed again, which can reduce the connection between the solidified glue and the printed inner frame 210 and the printed outer frame 220, affecting the subsequent removal of the printed inner frame 210 and the printed outer frame 220. On the other hand, it can also make the glue flow into the shape of the required support 150, thereby ensuring that the solidified glue can achieve the preset supporting effect.

[0031] Therefore, the viscosity of the glue is not less than a preset viscosity, so as to ensure that the glue has a certain fluidity and flows into a state that can be solidified into a preset support 150 shape after the printed inner frame 210 and the printed outer frame 220 are removed. For example, the viscosity of the glue is set to 3000 Pa.s-50000 mPa.s, and 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 gluing method, the glue can be a photocuring glue, and the viscosity can meet the above limitations, and the curing time is short, only a few seconds of ultraviolet light irradiation is required, and the processing efficiency is higher. For example, the photocuring glue can include an unsaturated polyester resin system, a polyacrylic acid ester, an epoxy acrylate, a polyurethane acrylate, a polythiol-polyene system, and a cationic curing base resin.

[0033] In this embodiment, the negative plate 110 circumferentially exceeds the positive plate 120, so the solidified support 150 is annular. After solidification, the positive plate 120 is placed on the inner side of the support 150 to form a single cell. In other embodiments, the positive plate 120 can also be placed on the solid-state electrolyte layer 130, and then the printed inner frame 210 and the printed outer frame 220 are placed, which can also form a single cell.

[0034] Next, a plurality of cell monomers are stacked in sequence to form a cell unit, and the cell unit is pressed at a preset pressure to form a solid-state battery. Optionally, the preset pressure is set to 400-800 Mpa to ensure that the contact between the positive plate 120 and the negative plate 110 can meet the normal discharge of the solid-state battery. The number of cell monomers stacked 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 the preset pressure, the shrinkage rate of the plurality of support members 150 is greater than or equal to the shrinkage rate of the cell unit, so as to ensure that the damage to the solid-state electrolyte layer 130 caused by the shrinkage of the support members 150 being too small during the pressing process.

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

[0037] Preferably, before placing the printed inner frame 210 and the printed outer frame 220 on the solid-state electrolyte layer 130, it 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 glue injection, it is used to ensure that the printed inner frame 210 and the printed outer frame 220 have a certain temperature, which is beneficial to ensure the fluidity of the glue, and avoid the pre-cooling solidification of the glue during the glue injection process, which cannot flow to the required state after the printed inner frame 210 and the printed outer frame 220 are removed. The preset temperature can be set to 40-200°C.

[0038] Further preferably, the printed inner frame 210 and the printed outer frame 220 are provided with an insulating layer on the side close to the solid-state electrolyte layer 130. By setting the insulating layer, the problem of contact short circuit between the printed inner frame 210 and the printed outer frame 220 and the negative tab of the negative plate 110 is avoided, and the reliability of the processing process is improved.

[0039] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of this specification should not be understood as a limitation of the present application.

Claims

1. A method of processing a solid-state battery, characterized by, The solid-state battery comprises a negative electrode sheet (110) and a positive electrode sheet (120), a solid-state electrolyte layer (130) is arranged between the negative electrode sheet (110) and the positive electrode sheet (120), and the negative electrode sheet (110) extends by a first preset width beyond the edge of the positive electrode sheet (120) in the circumferential direction to form a to-be-processed area (101). The solid-state battery processing method comprises the following steps: placing a printed inner frame (210) and a printed outer frame (220) on the solid-state electrolyte layer (130), the outer edge of the printed inner frame (210) is located in the to-be-processed area (101), the inner edge of the printed outer frame (220) is located in the to-be-processed area (101), and a glue applying area (201) is formed between the outer edge of the printed inner frame (210) and the inner edge of the printed outer frame (220), the glue applying area (201) is arranged to have a second preset width, and the second preset width is smaller than the first preset width; the ratio of the second preset width to the first preset width is 0.1-0.9; applying glue to the glue applying area (201), and removing the printed inner frame (210) and the printed outer frame (220), and after the glue is cured, a support (150) is formed, and the support (150) can be arranged between adjacent solid-state electrolyte layers (130).

2. The solid-state battery processing method of claim 1, wherein, After curing, the following steps are further included: placing the positive electrode sheet (120) on the inner side of the support (150) to form a single battery cell.

3. The solid-state battery processing method of claim 1, wherein, The negative electrode sheet (110), the solid-state electrolyte layer (130), the positive electrode sheet (120) and the support (150) form a single battery cell, a plurality of the single battery cells are stacked in sequence to form a battery cell unit, and the battery cell unit is pressed under a preset pressure to form the solid-state battery.

4. The solid-state battery processing method of claim 3, wherein, Under the preset pressure, the shrinkage rate of a plurality of the supports (150) is greater than or equal to the shrinkage rate of the battery cell unit.

5. The solid-state battery processing method of claim 1, wherein, After placing the printed inner frame (210) and the printed outer frame (220) on the solid-state electrolyte layer (130), the following steps are further included: taking a photo of the solid-state electrolyte layer (130), the printed inner frame (210) and the printed outer frame (220) to detect the positions of the printed inner frame (210) and the printed outer frame (220) on the solid-state electrolyte layer (130).

6. The solid-state battery processing method of claim 1, wherein, The viscosity of the glue is not less than a preset viscosity.

7. The solid-state battery processing method of claim 1, wherein, Before placing the printed inner frame (210) and the printed outer frame (220) on the solid-state electrolyte layer (130), the following step is further included:

8. The solid-state battery processing method of claim 1, wherein, heating the printed inner frame (210) and the printed outer frame (220) to a preset temperature.

9. The solid-state battery processing method of claim 1, wherein, The distance between the inner edge of the printed outer frame (220) and the outer edge of the to-be-processed area (101) is 0-3 mm. The printed inner frame (210) and the printed outer frame (220) are provided with an insulating layer on the side close to the solid-state electrolyte layer (130).

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