Etching-based solid-state battery cell manufacturing method and equipment

Abstract

The invention discloses an etching-based solid-state battery cell manufacturing method and a device for implementing the etching-based solid-state battery cell manufacturing method, and the etching-based solid-state battery cell manufacturing method comprises the following steps: taking a first pole piece as one of a positive pole piece and a negative pole piece, etching a groove which does not penetrate through the surface of the pole piece foil on the electrode layer of the first pole piece, and embedding the PI film into the groove; taking a second pole piece as the other one of the positive pole piece and the negative pole piece; and overlapping the first pole piece, the electrolyte layer and the second pole piece in a staggered manner to form the battery cell. According to the etching-based solid-state battery cell manufacturing method disclosed by the invention, an electrode material is difficult to cross a solid-state electrolyte layer to transfer to another adjacent pole piece after lithium separation of the pole piece, so that a short-circuit phenomenon of a solid-state battery caused by a lithium separation reaction is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state battery manufacturing, and in particular to a solid-state battery cell manufacturing method and equipment based on etching. Background Art

[0002] The traditional liquid lithium battery is also vividly called "rocking chair battery" by scientists. The two ends of the rocking chair are the positive and negative poles of the battery, and the electrolyte (liquid) is in the middle. The lithium ions are like excellent athletes, running back and forth between the two ends of the rocking chair. During the movement of lithium ions from the positive electrode to the negative electrode and then to the positive electrode, the battery's charging and discharging process is completed.

[0003] The principle of solid-state batteries is the same, except that their electrolyte is solid, and their density and structure allow more charged ions to gather at one end, conducting greater current and thereby increasing battery capacity.

[0004] However, the existing solid-state battery production process is immature. Due to lithium deposition on the pole piece, the electrode material is easily transferred across the solid electrolyte layer to the adjacent pole piece, resulting in contact short circuit. Summary of the invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a solid-state battery cell manufacturing method based on etching, which can prevent the electrode material from easily crossing the solid electrolyte layer to another adjacent pole piece after lithium is deposited on the pole piece, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium deposition reaction.

[0005] The present invention also proposes a device for implementing the above-mentioned etching-based solid-state battery cell manufacturing method.

[0006] A solid-state battery cell manufacturing method based on etching according to an embodiment of the first aspect of the present invention comprises the following steps: Take a first electrode sheet, used as one of a positive electrode sheet and a negative electrode sheet, etch a groove in the electrode layer of the first electrode sheet that does not penetrate to the surface of the electrode sheet foil, and embed the PI film into the groove; Taking a second electrode sheet, and using it as the other of the positive electrode sheet and the negative electrode sheet; The first pole piece, the electrolyte layer and the second pole piece are stacked alternately to form a battery cell.

[0007] A solid-state battery cell manufacturing method based on etching according to an embodiment of the present invention has at least the following beneficial effects: The present invention uses a first pole piece as one of a positive pole piece and a negative pole piece, etches a groove that does not penetrate the surface of the pole piece foil in the electrode layer of the first pole piece, and embeds a PI film into the groove, so that the PI film is embedded on the electrode layer of the first pole piece, and after lithium is precipitated from the first pole piece, it is not easy for the material to cross the PI film to the second pole piece on the other side of the electrolyte layer, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium precipitation reaction. Then, the second pole piece is taken, and the second pole piece is used as the other of the positive pole piece and the negative pole piece, so that the first pole piece and the second pole piece can respectively form the positive pole piece and the negative pole piece of the battery cell, and then, the first pole piece, the electrolyte layer and the second pole piece are staggered and overlapped to form a battery cell, so that the PI film can be embedded between the electrode layer and the electrolyte layer of the first pole piece, so that the PI film can prevent the material from passing after lithium is precipitated from the first pole piece, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium precipitation reaction.

[0008] According to some embodiments of the present invention, in the step of etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil, the groove is formed at an edge of the first pole piece.

[0009] Advantageously, the present invention forms a groove at the edge of the first pole piece so that the PI film is only embedded at the edge of the first pole piece, thereby preventing the electrochemical performance of the pole piece from being affected by a large amount of pole piece material being lost due to the setting of the PI film.

[0010] According to some embodiments of the present invention, in the step of alternately stacking the first pole piece, the electrolyte layer and the second pole piece to form a battery cell, a surface of the first pole piece on which the PI film is embedded is bonded to the electrolyte layer.

[0011] Advantageously, the present invention laminates the surface of the first pole piece on which the PI film is embedded with the electrolyte layer, thereby enabling the PI film to be embedded between the electrode layer and the electrolyte layer of the first pole piece, and further enabling the PI film to block the passage of material on the path where the material crosses to the pole piece on the other side of the electrolyte layer after lithium deposition from the first pole piece.

[0012] According to some embodiments of the present invention, the first pole piece is configured as a positive pole piece, the second pole piece is configured as a negative pole piece, the groove is formed on the surface of the positive electrode layer on one side of the positive pole piece, the PI film is embedded in the groove, the side of the positive pole piece embedded with the PI film is bonded to the electrolyte layer, and the other side of the electrolyte layer is bonded to the negative pole piece.

[0013] According to some embodiments of the present invention, the first pole piece is configured as a positive pole piece, and the second pole piece is configured as a negative pole piece, the positive pole piece includes a positive electrode foil layer and two positive electrode layers respectively arranged on both sides of the positive electrode foil layer, the surfaces of the two positive electrode layers are formed with the grooves, the PI film is embedded in the grooves, the two sides of the positive pole piece embedded with the PI film are respectively bonded to the two electrolyte layers, and the other sides of the two electrolyte layers are respectively bonded to the two negative pole pieces.

[0014] According to some embodiments of the present invention, the first pole piece is configured as a negative pole piece, the second pole piece is configured as a positive pole piece, the groove is formed on the surface of the negative electrode layer on one side of the negative pole piece, the PI film is embedded in the groove, the side of the negative pole piece embedded with the PI film is bonded to the electrolyte layer, and the other side of the electrolyte layer is bonded to the positive pole piece.

[0015] According to some embodiments of the present invention, the first electrode sheet is configured as a negative electrode sheet, and the second electrode sheet is configured as a positive electrode sheet. The negative electrode sheet includes a negative electrode foil layer and two negative electrode layers respectively arranged on both sides of the negative electrode foil layer, the surfaces of the two negative electrode layers are both formed with the grooves, the PI film is embedded in the grooves, the two sides of the negative electrode sheet embedded with the PI film are respectively bonded to the two electrolyte layers, and the other sides of the two electrolyte layers are respectively bonded to the two positive electrode sheets.

[0016] According to some embodiments of the present invention, in the step of etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil, a laser etching method is used to etch the groove in the electrode layer of the first pole piece.

[0017] Advantageously, the present invention etches a groove in the electrode layer of the first pole piece by using a laser etching method, thereby achieving high etching accuracy, high efficiency and high flexibility.

[0018] According to some embodiments of the present invention, etching a groove that does not penetrate the surface of the electrode foil in the electrode layer of the first electrode sheet, and embedding the PI film into the groove, comprises the following steps: Unwinding the first pole piece, and etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil; Transfer the PI film to the groove position so that the PI film is embedded in the groove; The first pole piece embedded with the PI film is cut into pieces to form a sheet-shaped first pole piece.

[0019] Advantageously, the present invention etches a groove in the first pole piece after the rolled first pole piece is unrolled, then embeds the PI film into the groove, and then cuts the first pole piece embedded with the PI film into pieces to form a sheet-like first pole piece, thereby enabling the cut sheet-like first pole piece to be directly stacked with the sheet-like second pole piece and the electrolyte layer to form a battery cell, which is beneficial to the stacking of the first pole piece, the second pole piece and the electrolyte layer.

[0020] According to some embodiments of the present invention, the step of transferring the PI film to the groove position so that the PI film is embedded in the groove comprises the following steps: A multi-axis robot with an adsorption actuator is used to transfer the PI film that has been cut into sheets into the groove.

[0021] Advantageously, the present invention transfers the PI film that has been pre-cut into sheets into the groove by using a multi-axis robot arm with an adsorption execution end, thereby making the transfer and installation of the PI film more flexible.

[0022] According to some embodiments of the present invention, the step of transferring the PI film to the groove position so that the PI film is embedded in the groove comprises the following steps: Unwind the roll PI film and laminate it into the groove.

[0023] Advantageously, the present invention unwinds the rolled PI film and laminates it into the groove, thereby enabling the rolled PI film to be laminated into the groove during the first electrode sheet conveying process, and the lamination efficiency is high.

[0024] According to some embodiments of the present invention, etching a groove that does not penetrate the surface of the electrode foil in the electrode layer of the first electrode sheet, and embedding the PI film into the groove, comprises the following steps: Unwinding the first pole piece, and cutting the unwinding first pole piece to form a sheet-shaped first pole piece; Etching a groove in the electrode layer of the sheet-shaped first electrode sheet that does not penetrate to the surface of the electrode sheet foil; A multi-axis robot with an adsorption actuator is used to transfer the PI film that has been cut into sheets into the groove.

[0025] Advantageously, the present invention unwinds and cuts the rolled first pole piece to form a sheet-like first pole piece, then etches a groove in the electrode layer of the sheet-like first pole piece that does not penetrate the surface of the pole piece foil, and then uses a multi-axis robotic arm with an adsorption execution end to transfer the PI film pre-cut into a sheet into the groove, thereby making the processing and stacking of each sheet-like first pole piece more flexible.

[0026] According to an embodiment of the second aspect of the present invention, an etching-based solid-state battery cell manufacturing device is used to implement an etching-based solid-state battery cell manufacturing method according to an embodiment of the first aspect of the present invention, and the etching-based solid-state battery cell manufacturing device includes: A pole piece forming device, used for etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil, and embedding the PI film into the groove; The lamination device is used to alternately stack the first pole sheet, the electrolyte layer and the second pole sheet to form a battery core.

[0027] A solid-state battery cell manufacturing device based on etching according to an embodiment of the present invention has at least the following beneficial effects: The present invention provides a pole piece forming device, which etches a groove that does not penetrate to the surface of the pole piece foil on the electrode layer of the first pole piece, and embeds the PI film into the groove, so that the PI film is embedded on the electrode layer of the first pole piece, and after lithium is precipitated from the first pole piece, it is not easy for the material to cross the PI film to the second pole piece on the other side of the electrolyte layer, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium precipitation reaction. Then, a stacking device is provided, which alternately stacks the first pole piece, the electrolyte layer and the second pole piece to form a battery core, thereby allowing the PI film to be embedded between the electrode layer and the electrolyte layer of the first pole piece, so that the PI film can block the passage of the material after lithium is precipitated from the first pole piece, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium precipitation reaction.

[0028] According to some embodiments of the present invention, the pole piece forming device includes a pole piece unwinding mechanism, an etching mechanism and a PI film embedding mechanism which are arranged in sequence along the first pole piece conveying path, the etching mechanism outputs a laser beam to etch a groove on the first pole piece, and the PI film embedding mechanism is used to embed the PI film into the groove.

[0029] What is beneficial is that: the present invention sequentially arranges a pole piece unwinding mechanism, an etching mechanism and a PI film embedding mechanism along the first pole piece conveying path in the pole piece forming device, the etching mechanism outputs a laser beam to etch a groove on the first pole piece, and the PI film embedding mechanism is used to embed the PI film into the groove, so that the pole piece forming device can etch a groove on the first pole piece and embed the PI film into the groove, thereby completing the embedding of the PI film.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0032] Figure 1A schematic flow chart of a solid-state battery cell manufacturing method based on etching according to an embodiment of the first aspect of the present invention; Figure 2 This is a flow chart of Example 1 of step S1000 of a method for manufacturing a solid-state battery cell based on etching according to an embodiment of the first aspect of the present invention; Figure 3 A schematic flow chart of a further implementation of Example 1 of step S1000 of a method for manufacturing a solid-state battery cell based on etching according to an embodiment of the first aspect of the present invention; Figure 4 This is a flow chart of Example 2 of step S1000 of a solid-state battery cell manufacturing method based on etching according to an embodiment of the first aspect of the present invention; Figure 5 A schematic flow chart of a further implementation of Example 2 of step S1000 of a method for manufacturing a solid-state battery cell based on etching according to an embodiment of the first aspect of the present invention; Figure 6 This is a flow chart of Example 3 of step S1000 of a solid-state battery cell manufacturing method based on etching according to an embodiment of the first aspect of the present invention; Figure 7 A schematic diagram of the structure of a solid-state battery cell provided according to an embodiment of the present invention; FIG8 is a schematic diagram of the structure of a solid-state battery cell when the first electrode sheet is set as a positive electrode sheet and the second electrode sheet is set as a negative electrode sheet according to an embodiment of the present invention; FIG8(a) is a schematic diagram of the structure of a solid-state battery cell in which a PI film is embedded on one side of the positive electrode sheet; FIG8(b) is a schematic diagram of the structure of a solid-state battery cell in which a PI film is embedded on both sides of the positive electrode sheet; FIG9 is a schematic diagram of the structure of a solid-state battery cell when the first electrode sheet is set as a negative electrode sheet and the second electrode sheet is set as a positive electrode sheet according to an embodiment of the present invention; FIG9 (a) is a schematic diagram of the structure of a solid-state battery cell in which a PI film is embedded on one side of the negative electrode sheet; FIG9 (b) is a schematic diagram of the structure of a solid-state battery cell in which a PI film is embedded on both sides of the negative electrode sheet; Fig.10 A schematic structural diagram of a solid-state battery cell manufacturing device based on etching according to an embodiment of the second aspect of the present invention; Fig.11 A schematic structural diagram of a solid-state battery cell manufacturing device based on etching according to another embodiment of the second aspect of the present invention; Fig.12 This is a schematic structural diagram of a solid-state battery cell manufacturing device based on etching according to another embodiment of the second aspect of the present invention.

[0033] Reference numerals: 100-first pole piece, 110-electrode layer, 120-pole piece foil, 130-groove, 140-PI film, 150-second pole piece, 160-electrolyte layer, 170-pole piece unwinding mechanism, 180-etching mechanism, 190-PI film embedding mechanism, 200-first tension swing arm, 210-positioning sensor, 220-correction system, 230-correction detection mechanism, 240-tension detector, 250-laser etching Machine, 260-etching platform, 270-second tension swing arm, 280-PI film unwinding assembly, 290-third tension swing arm, 300-laminating assembly, 310-cutting mechanism, 320-winding mechanism, 330-surface defect detection mechanism, 340-defective product marking mechanism, 350-positive electrode sheet, 360-positive electrode layer, 370-positive foil layer, 380-negative electrode sheet, 390-negative electrode layer, 400-negative foil layer. DETAILED DESCRIPTION

[0034] 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0036] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Combine the following Figures 1 to 12 A solid-state battery cell manufacturing method and device based on etching according to an embodiment of the present invention are described.

[0039] Reference Figure 1 In a first aspect, the present invention provides an embodiment of a solid-state battery cell manufacturing method based on etching.

[0040] In this embodiment, a solid-state battery cell manufacturing method based on etching includes the following steps: Step S1000: Take the first electrode sheet 100, which is used as one of the positive electrode sheet 350 and the negative electrode sheet 380, etch a groove 130 that does not penetrate the surface of the electrode sheet foil 120 in the electrode layer 110 of the first electrode sheet 100, and embed the PI film 140 into the groove 130; Step S2000: Take the second electrode sheet 150 and use it as the other of the positive electrode sheet 350 and the negative electrode sheet 380; Step S3000: Alternately stack the first electrode sheet 100, the electrolyte layer 160 and the second electrode sheet 150 to form a battery cell.

[0041] It can be understood that in this embodiment, the first electrode sheet 100 is used as one of the positive electrode sheet 350 and the negative electrode sheet 380, and a groove 130 that does not penetrate the surface of the electrode foil 120 is etched in the electrode layer 110 of the first electrode sheet 100, and the PI film 140 is embedded in the groove 130, so that the PI film 140 is embedded on the electrode layer 110 of the first electrode sheet 100. After lithium is precipitated from the first electrode sheet 100, it is not easy for the material to cross the PI film 140 to the second electrode sheet 150 on the other side of the electrolyte layer 160, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium precipitation reaction. Then, the second electrode sheet 150 is taken, and the first electrode sheet 150 is taken. The second electrode sheet 150 is used as the other of the positive electrode sheet 350 and the negative electrode sheet 380, so that the first electrode sheet 100 and the second electrode sheet 150 can respectively form the positive electrode sheet 350 and the negative electrode sheet 380 of the battery cell. Then, the first electrode sheet 100, the electrolyte layer 160 and the second electrode sheet 150 are alternately stacked to form a battery cell, so that the PI film 140 can be embedded between the electrode layer 110 and the electrolyte layer 160 of the first electrode sheet 100, so that the PI film 140 can block the passage of materials after lithium is deposited on the first electrode sheet 100, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium deposition reaction.

[0042] In some specific embodiments, in the step of etching the groove 130 which does not penetrate the surface of the electrode foil 120 in the electrode layer 110 of the first electrode piece 100 , the groove 130 is formed at the edge of the first electrode piece 100 .

[0043] In this embodiment, the groove 130 is formed at the edge of the first pole piece 100 so that the PI film 140 is only embedded at the edge of the first pole piece 100 . Therefore, the electrochemical performance of the pole piece will not be affected by the large amount of pole piece material missing due to the setting of the PI film 140 .

[0044] In some specific embodiments, the thickness of the PI film 140 is 7 μm.

[0045] In some specific embodiments, in the step of etching the groove 130 which does not penetrate the surface of the electrode foil 120 in the electrode layer 110 of the first pole piece 100, a laser etching method is used to etch the groove 130 in the electrode layer 110 of the first pole piece 100, thereby achieving high etching accuracy, high efficiency and high flexibility.

[0046] For step S1000, the present invention provides the following embodiments: Example 1 Reference Figure 2 and Figure 3 , etching a groove 130 that does not penetrate the surface of the electrode foil 120 in the electrode layer 110 of the first electrode 100, and embedding the PI film 140 into the groove 130, including the following steps: Step S1110: unwinding the first pole piece 100, and etching a groove 130 in the electrode layer 110 of the first pole piece 100 that does not penetrate to the surface of the pole piece foil 120; Step S1120: transferring the PI film 140 to the position of the groove 130 so that the PI film 140 is embedded in the groove 130; Step S1130 : cutting the first pole piece 100 embedded with the PI film 140 into pieces to form a sheet-shaped first pole piece 100 .

[0047] It can be understood that in this embodiment, after the rolled first pole sheet 100 is unrolled, the groove 130 is first etched in the first pole sheet 100, and the PI film 140 is embedded in the groove 130, and then the first pole sheet 100 embedded with the PI film 140 is cut into pieces to form a sheet-like first pole sheet 100, so that the cut sheet-like first pole sheet 100 can be directly stacked with the sheet-like second pole sheet 150 and the electrolyte layer 160 to form a battery cell, which is beneficial to the stacking of the first pole sheet 100, the second pole sheet 150 and the electrolyte layer 160.

[0048] Further, the PI film 140 is transferred to the position of the groove 130 so that the PI film 140 is embedded in the groove 130, including the following steps: Step S1121 : using a multi-axis robot arm with an adsorption execution end to transfer the PI film 140 cut into sheets in advance into the groove 130 .

[0049] It can be understood that in this embodiment, the PI film 140 that is pre-cut into sheets is transferred into the groove 130 by using a multi-axis robot arm with an adsorption execution end, thereby making the transfer and installation of the PI film 140 more flexible.

[0050] In some specific embodiments, the first pole piece 100 can be rolled up after the PI film 140 is embedded in the groove 130, so as to facilitate the turnover of the first pole piece 100 after the PI film 140 is embedded and then carry out subsequent processes, and then the first pole piece 100 after the PI film 140 is embedded can be unrolled and cut.

[0051] Example 2 Reference Figure 4 and Figure 5 , etching a groove 130 that does not penetrate the surface of the electrode foil 120 in the electrode layer 110 of the first electrode 100, and embedding the PI film 140 into the groove 130, including the following steps: Step S1110: unwinding the first pole piece 100, and etching a groove 130 in the electrode layer 110 of the first pole piece 100 that does not penetrate to the surface of the pole piece foil 120; Step S1120: transferring the PI film 140 to the position of the groove 130 so that the PI film 140 is embedded in the groove 130; Step S1130 : cutting the first pole piece 100 embedded with the PI film 140 into pieces to form a sheet-shaped first pole piece 100 .

[0052] It can be understood that in this embodiment, after the rolled first pole sheet 100 is unrolled, the groove 130 is first etched in the first pole sheet 100, and the PI film 140 is embedded in the groove 130, and then the first pole sheet 100 embedded with the PI film 140 is cut into pieces to form a sheet-like first pole sheet 100, so that the cut sheet-like first pole sheet 100 can be directly stacked with the sheet-like second pole sheet 150 and the electrolyte layer 160 to form a battery cell, which is beneficial to the stacking of the first pole sheet 100, the second pole sheet 150 and the electrolyte layer 160.

[0053] Further, the PI film 140 is transferred to the position of the groove 130 so that the PI film 140 is embedded in the groove 130, including the following steps: Step S1122 : unwinding the roll PI film 140 and laminating it into the groove 130 .

[0054] It can be understood that in this embodiment, the rolled PI film 140 is unrolled and laminated into the groove 130 , so that the rolled PI film 140 can be laminated into the groove 130 during the conveying process of the first pole piece 100 , and the lamination efficiency is high.

[0055] In some specific embodiments, the first pole piece 100 can be rolled up after the PI film 140 is embedded in the groove 130, so as to facilitate the turnover of the first pole piece 100 after the PI film 140 is embedded and then carry out subsequent processes, and then the first pole piece 100 after the PI film 140 is embedded can be unrolled and cut.

[0056] Example 3 Reference Figure 6 , etching a groove 130 that does not penetrate the surface of the electrode foil 120 in the electrode layer 110 of the first electrode 100, and embedding the PI film 140 into the groove 130, including the following steps: Step S1210: unwinding the first pole piece 100, and cutting the unwinding first pole piece 100 to form a sheet-shaped first pole piece 100; Step S1220: etching a groove 130 that does not penetrate to the surface of the electrode foil 120 in the electrode layer 110 of the sheet-shaped first electrode 100; Step S1230 : using a multi-axis robot arm with an adsorption execution end to transfer the PI film 140 that has been cut into sheets in advance into the groove 130 .

[0057] It can be understood that in this embodiment, the rolled first pole piece 100 is first unrolled and cut to form a sheet-like first pole piece 100, and then a groove 130 that does not penetrate the surface of the pole piece foil 120 is etched in the electrode layer 110 of the sheet-like first pole piece 100, and then a multi-axis robot arm with an adsorption execution end is used to transfer the PI film 140 pre-cut into a sheet into the groove 130, thereby making the processing and stacking of each sheet-like first pole piece 100 more flexible.

[0058] In step S3000 , the electrolyte layer 160 may be pre-laminated with the second electrode sheet 150 , or may be formed into a sheet structure and then overlapped with the sheet-like first electrode sheet 100 and the sheet-like second electrode sheet 150 .

[0059] In some specific embodiments, the surface of the first electrode 100 embedded with the PI film 140 is bonded to the electrolyte layer 160 .

[0060] In this embodiment, the side of the first pole piece 100 on which the PI film 140 is embedded is bonded to the electrolyte layer 160, so that the PI film 140 can be embedded between the electrode layer 110 and the electrolyte layer 160 of the first pole piece 100, and further, the PI film 140 can block the passage of materials on the path where the materials cross to the pole piece on the other side of the electrolyte layer 160 after lithium deposition from the first pole piece 100.

[0061] Reference Figure 7According to the structure of the solid-state battery cell provided by an embodiment of the present invention, the first pole piece 100, the electrolyte layer 160 and the second pole piece 150 are stacked in sequence, and the PI film 140 is embedded in the surface of the electrode layer 110 on the side of the first pole piece 100 close to the electrolyte layer 160.

[0062] Specifically, a solid-state battery cell manufactured by a solid-state battery cell manufacturing method based on etching according to an embodiment of the first aspect of the present invention can form at least the following structures: When the first electrode sheet 100 is set as the positive electrode sheet 350 and the second electrode sheet 150 is set as the negative electrode sheet 380, referring to Figure 8 (a), in some embodiments, the groove 130 is formed on the surface of the positive electrode layer 360 on one side of the positive electrode sheet 350, and the PI film 140 is embedded in the groove 130. The side of the positive electrode sheet 350 embedded with the PI film 140 is bonded to the electrolyte layer 160, and the other side of the electrolyte layer 160 is bonded to the negative electrode sheet 380.

[0063] 8( b ), in some other embodiments, the positive electrode sheet 350 includes a positive electrode foil layer 370 and two positive electrode layers 360 respectively arranged on both sides of the positive electrode foil layer 370 , grooves 130 are formed on the surfaces of the two positive electrode layers 360 , and the PI film 140 is embedded in the groove 130 , and the two sides of the positive electrode sheet 350 embedded with the PI film 140 are respectively bonded to the two electrolyte layers 160 , and the other sides of the two electrolyte layers 160 are respectively bonded to the two negative electrode sheets 380 .

[0064] When the first electrode sheet 100 is set as the negative electrode sheet 380 and the second electrode sheet 150 is set as the positive electrode sheet 350, referring to Figure 9 (a), in some embodiments, the groove 130 is formed on the surface of the negative electrode layer 390 on one side of the negative electrode sheet 380, and the PI film 140 is embedded in the groove 130. The side of the negative electrode sheet 380 embedded with the PI film 140 is bonded to the electrolyte layer 160, and the other side of the electrolyte layer 160 is bonded to the positive electrode sheet 350.

[0065] 9 (b), in some other embodiments, the negative electrode sheet 380 includes a negative electrode foil layer 400 and two negative electrode layers 390 respectively arranged on both sides of the negative electrode foil layer 400, grooves 130 are formed on the surfaces of the two negative electrode layers 390, and the PI film 140 is embedded in the groove 130. The two sides of the negative electrode sheet 380 embedded with the PI film 140 are respectively bonded to the two electrolyte layers 160, and the other sides of the two electrolyte layers 160 are respectively bonded to the two positive electrode sheets 350.

[0066] Reference Fig.10In the second aspect, the present invention provides an embodiment of an etching-based solid-state battery cell manufacturing device, which is used to implement an etching-based solid-state battery cell manufacturing method of the first aspect. Specifically, the etching-based solid-state battery cell manufacturing device includes a pole piece forming device and a stacking device.

[0067] The pole piece forming device is used to etch a groove 130 that does not penetrate the surface of the pole piece foil 120 in the electrode layer 110 of the first pole piece 100 , and embed the PI film 140 into the groove 130 .

[0068] In this embodiment, a pole piece forming device is provided. The pole piece forming device etches a groove 130 which does not penetrate to the surface of the pole piece foil 120 in the electrode layer 110 of the first pole piece 100, and embeds the PI film 140 into the groove 130. Thus, the PI film 140 is embedded on the electrode layer 110 of the first pole piece 100. After lithium is deposited from the first pole piece 100, it is not easy for the material to cross the PI film 140 to the second pole piece 150 on the other side of the electrolyte layer 160, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium deposition reaction.

[0069] Specifically, the pole piece forming device includes a pole piece unwinding mechanism 170, an etching mechanism 180 and a PI film embedding mechanism 190 which are arranged in sequence along the conveying path of the first pole piece 100. The etching mechanism 180 outputs a laser beam to etch a groove 130 on the first pole piece 100, and the PI film embedding mechanism 190 is used to embed the PI film 140 into the groove 130.

[0070] In this embodiment, a pole piece unwinding mechanism 170, an etching mechanism 180 and a PI film embedding mechanism 190 are sequentially arranged along the conveying path of the first pole piece 100 in the pole piece forming device. The etching mechanism 180 outputs a laser beam to etch a groove 130 on the first pole piece 100. The PI film embedding mechanism 190 is used to embed the PI film 140 into the groove 130. Thus, the pole piece forming device can etch the groove 130 on the first pole piece 100 and embed the PI film 140 into the groove 130, thereby completing the embedding of the PI film 140.

[0071] In some specific embodiments, a first tension swing arm 200 is arranged between the electrode unwinding mechanism 170 and the etching mechanism 180. The first tension swing arm 200 is used to tension the first electrode 100, so that the first electrode 100 is tensioned during transportation to avoid wrinkling of the first electrode 100 during transportation, which is beneficial to improve the accuracy of the etching position of the first electrode 100 by the etching mechanism 180.

[0072] In some specific embodiments, the first tension swing arm 200 and the etching mechanism 180 bracket are provided with a positioning sensor 210, a correction system 220 and a correction detection mechanism 230 in sequence along the conveying path of the first pole piece 100. The first positioning sensor 210 is used to detect the position of the first pole piece 100, the correction system 220 is used to correct the position of the first pole piece 100, and the correction detection mechanism 230 is used to detect the position of the first pole piece 100 after the position is corrected. Thus, it is convenient to detect and correct the position of the first pole piece 100 during the conveying process of the first pole piece 100, so that the subsequent etching position of the etching mechanism 180 on the first pole piece 100 is more accurate.

[0073] Furthermore, two deviation correction detection mechanisms 230 are provided, and a tension detector 240 and a positioning sensor 210 are provided between the two deviation correction detection mechanisms 230. The tension detector 240 is used to detect the tension of the first pole piece 100, thereby facilitating the monitoring of the tension of the first pole piece 100. At the same time, a positioning sensor 210 is provided between the two deviation correction detection mechanisms 230 to improve the accuracy of the position detection of the first pole piece 100.

[0074] In some specific embodiments, the etching mechanism 180 includes a laser etcher 250 and an etching platform 260 . The etching platform 260 is used to support and position the first pole piece 100 . The laser etcher 250 outputs a laser beam to the first pole piece 100 on the etching platform 260 to etch a groove 130 on the first pole piece 100 .

[0075] In some specific embodiments, a second tension swing arm 270 is arranged between the etching mechanism 180 and the PI film embedding mechanism 190. The second tension swing arm 270 is used to tension the first pole piece 100, so that the first pole piece 100 is tensioned during transportation to avoid wrinkling of the first pole piece 100 during transportation, which is beneficial to improve the accuracy of the PI film 140 embedding position of the first pole piece 100 by the PI film embedding mechanism 190.

[0076] In some specific embodiments, the PI film embedding mechanism 190 can be configured as a multi-axis robotic arm with an adsorption execution end, and the multi-axis robotic arm transfers the PI film 140 pre-cut into sheets into the groove 130, thereby making the transfer and installation of the PI film 140 more flexible.

[0077] Reference Fig.11In other embodiments, the PI film embedding mechanism 190 may also include a PI film unwinding assembly 280, a third tension swing arm 290 and a laminating assembly 300. The PI film unwinding assembly 280 is used to unwind the rolled PI film 140, the third tension swing arm 290 is used to tension the PI film 140, and the laminating assembly 300 is used to laminate the PI film 140 in the groove 130 of the first pole piece 100, so that the rolled PI film 140 can be laminated into the groove 130 during the conveying process of the first pole piece 100, and the laminating efficiency is high.

[0078] Reference Fig.12 In some specific embodiments, a cutting mechanism 310 may be provided after the PI film embedding mechanism 190 , and the cutting mechanism 310 is used to cut the first pole piece 100 into sheet-shaped first pole pieces 100 , so that subsequent lamination processing can be directly performed.

[0079] Refer again Fig.10 and Fig.11 In other embodiments, a winding mechanism 320 may be provided after the PI film embedding mechanism 190. The winding mechanism 320 is used to wind up the first pole piece 100 after the PI film 140 is embedded, so as to facilitate the turnover of the first pole piece 100 after the PI film 140 is embedded before carrying out subsequent processes. Then, the PI film 140 unwinding mechanism and the cutting mechanism 310 are sequentially provided after the winding mechanism 320 to unwind and cut the first pole piece 100 after the PI film 140 is embedded.

[0080] Furthermore, a surface defect detection mechanism 330 and a defective product marking mechanism 340 may be sequentially arranged between the PI film embedding mechanism 190 and the winding mechanism 320. The surface defect detection mechanism 330 detects surface defects on the front and back sides of the first electrode 100 by photographic imaging, and the defective product marking mechanism 340 is used to mark defective products with surface defects detected by the surface defect detection mechanism 330, thereby facilitating the subsequent selection of defective products with surface defects.

[0081] As for the lamination device, the lamination device is used to alternately stack the first pole sheet 100, the electrolyte layer 160 and the second pole sheet 150 to form a battery cell.

[0082] In this embodiment, a stacking device is provided, which alternately stacks the first pole piece 100, the electrolyte layer 160 and the second pole piece 150 to form a battery cell, so that the PI film 140 can be embedded between the electrode layer 110 and the electrolyte layer 160 of the first pole piece 100, so that the PI film 140 can block the passage of materials after lithium is deposited on the first pole piece 100, thereby avoiding the short circuit phenomenon of the solid-state battery caused by the lithium deposition reaction.

[0083] Specifically, the lamination device may use an existing lamination machine.

[0084] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] The terms "first, second, third, fourth", etc. (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that shown or described herein.

[0086] It should also be noted that in the description of this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0087] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may also include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0088] Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0089] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for manufacturing a solid-state battery cell based on etching, characterized in that: The steps include: Take a first electrode sheet, used as one of a positive electrode sheet and a negative electrode sheet, etch a groove in the electrode layer of the first electrode sheet that does not penetrate to the surface of the electrode sheet foil, and embed the PI film into the groove; Taking a second electrode sheet, and using it as the other of the positive electrode sheet and the negative electrode sheet; The first pole piece, the electrolyte layer and the second pole piece are stacked alternately to form a battery cell.

2. A solid-state battery cell manufacturing method based on etching according to claim 1, characterized in that: In the step of etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil, the groove is formed at an edge of the first pole piece.

3. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: In the step of alternately stacking the first pole piece, the electrolyte layer and the second pole piece to form a battery cell, the side of the first pole piece embedded with the PI film is bonded to the electrolyte layer.

4. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The first pole piece is configured as a positive pole piece, the second pole piece is configured as a negative pole piece, the groove is formed on the surface of the positive electrode layer on one side of the positive pole piece, the PI film is embedded in the groove, the side of the positive pole piece embedded with the PI film is bonded to the electrolyte layer, and the other side of the electrolyte layer is bonded to the negative pole piece.

5. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The first electrode sheet is configured as a positive electrode sheet, and the second electrode sheet is configured as a negative electrode sheet. The positive electrode sheet includes a positive electrode foil layer and two positive electrode layers respectively arranged on both sides of the positive electrode foil layer. The surfaces of the two positive electrode layers are both formed with the grooves, and the PI film is embedded in the grooves. The two sides of the positive electrode sheet embedded with the PI film are respectively bonded to the two electrolyte layers, and the other sides of the two electrolyte layers are respectively bonded to the two negative electrode sheets.

6. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The first pole piece is configured as a negative pole piece, the second pole piece is configured as a positive pole piece, the groove is formed on the surface of the negative electrode layer on one side of the negative pole piece, the PI film is embedded in the groove, the side of the negative pole piece embedded with the PI film is bonded to the electrolyte layer, and the other side of the electrolyte layer is bonded to the positive pole piece.

7. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The first electrode sheet is configured as a negative electrode sheet, and the second electrode sheet is configured as a positive electrode sheet. The negative electrode sheet includes a negative electrode foil layer and two negative electrode layers respectively arranged on both sides of the negative electrode foil layer. The surfaces of the two negative electrode layers are both formed with the grooves, and the PI film is embedded in the grooves. The two sides of the negative electrode sheet embedded with the PI film are respectively bonded to the two electrolyte layers, and the other sides of the two electrolyte layers are respectively bonded to the two positive electrode sheets.

8. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: In the step of etching a groove that does not penetrate the surface of the electrode foil in the electrode layer of the first electrode piece, a laser etching method is used to etch the groove in the electrode layer of the first electrode piece.

9. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The step of etching a groove that does not penetrate the surface of the electrode foil in the electrode layer of the first electrode sheet and embedding the PI film into the groove comprises the following steps: Unwinding the first pole piece, and etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil; Transfer the PI film to the groove position so that the PI film is embedded in the groove; The first pole piece embedded with the PI film is cut into pieces to form a sheet-shaped first pole piece.

10. The method for manufacturing a solid-state battery cell based on etching according to claim 9, characterized in that: The step of transferring the PI film to the groove position so that the PI film is embedded in the groove comprises the following steps: A multi-axis robot with an adsorption actuator is used to transfer the PI film that has been cut into sheets into the groove.

11. The method for manufacturing a solid-state battery cell based on etching according to claim 9, characterized in that: The step of transferring the PI film to the groove position so that the PI film is embedded in the groove comprises the following steps: Unwind the roll PI film and laminate it into the groove.

12. The method for manufacturing a solid-state battery cell based on etching according to claim 1, characterized in that: The step of etching a groove that does not penetrate the surface of the electrode foil in the electrode layer of the first electrode sheet and embedding the PI film into the groove comprises the following steps: Unwinding the first pole piece, and cutting the unwinding first pole piece to form a sheet-shaped first pole piece; Etching a groove in the electrode layer of the sheet-shaped first electrode sheet that does not penetrate to the surface of the electrode sheet foil; A multi-axis robot with an adsorption actuator is used to transfer the PI film that has been cut into sheets into the groove.

13. A solid-state battery cell manufacturing device based on etching, characterized in that: Used to implement a solid-state battery cell manufacturing method based on etching as claimed in claim 1, the solid-state battery cell manufacturing equipment based on etching comprises: A pole piece forming device, used for etching a groove in the electrode layer of the first pole piece that does not penetrate to the surface of the pole piece foil, and embedding the PI film into the groove; The lamination device is used to alternately stack the first pole sheet, the electrolyte layer and the second pole sheet to form a battery core.

14. The etching-based solid-state battery cell manufacturing equipment according to claim 13, characterized in that: The pole piece forming device includes a pole piece unwinding mechanism, an etching mechanism and a PI film embedding mechanism which are sequentially arranged along the first pole piece conveying path. The etching mechanism outputs a laser beam to etch a groove on the first pole piece, and the PI film embedding mechanism is used to embed the PI film into the groove.

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