Preparation device of positive pole piece of all-solid-state battery

Abstract

The invention discloses a preparation device of a positive pole piece of an all-solid-state battery, and relates to the technical field of battery production, the preparation device comprises a box body, one end of the box body is provided with a first L-shaped plate, and the top of the first L-shaped plate is provided with a pole piece unwinding mechanism; a second L-shaped plate is mounted at the other end of the first L-shaped plate, and a pole piece winding mechanism is mounted at the top of the second L-shaped plate; limiting conveying rollers are installed at the bottom end in the box body at equal intervals. According to the invention, the thin film is wound on the outer wall of the pressing roller, when the pole piece passes through the pressing roller, the infiltrated pole piece can adhere the thin film to the surface of the pole piece, and the arranged thin film can limit a solution adhered to the outer surface of the pole piece, so that the condition that some solutions drop in the transportation process of the pole piece is avoided; and in the process that the film is transported along with the pole piece, the thickness of the film wound on the outer walls of the pressing rollers is gradually reduced, at the moment, the two pressing rollers are close to each other through the arranged springs and can always keep in contact with the surface of the pole piece, and the situation that the film cannot be adhered to the pole piece is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a device for preparing a positive electrode sheet of an all-solid-state battery. Background Art

[0002] Solid-state batteries are a new technology in current battery technology. They use solid electrodes and solid electrolytes, which are different from traditional lithium-ion batteries and lithium-ion polymer batteries. As a part of the battery, the positive electrode is responsible for carrying the reduction reaction of active substances during discharge, so it has an important potential.

[0003] In all-solid-state batteries, in order to improve the conductivity of the positive electrode, a solid electrolyte is usually attached to its surface. In the prior art, some solutions, such as the electrode structure of lithium solid-state batteries disclosed in CN212365998U, attempt to increase the active material loading on the current collector surface, improve the adhesion of the solid electrolyte, and enhance the ion transfer capacity of the electrolyte. However, the existing lithium solid-state battery electrode structure still has the following problems: 1. Problems of uniform distribution and difficulty in adhesion of solid electrolytes: In the prior art, solid electrolytes are often present in the form of micron-sized granular powders, which makes it difficult to evenly distribute them on the surface of the positive electrode sheet, which is not conducive to improving the conductivity of the positive electrode sheet. At the same time, due to the properties of the solid electrolyte powder, its adhesion on the surface of the electrode sheet is poor, which limits the ion transfer capacity and affects the charging and discharging efficiency and energy density of the solid-state battery.

[0004] 2. Solution dripping and material utilization efficiency problems during transportation: In the prior art, solution dripping is very likely to occur during the transportation of the electrode, which may lead to battery performance loss or product waste. There is also the problem of material waste, that is, some solutions cannot be fully absorbed and utilized by the positive electrode, resulting in reduced material utilization efficiency. Summary of the invention

[0005] The present invention provides a positive electrode plate of an all-solid-state battery and a preparation device thereof, which limits the solid electrolyte on the surface of the plate by thin film adhesion, thereby solving the problems of difficulty in uniform distribution and insufficient adhesion of the solid electrolyte in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a device for preparing a positive electrode sheet of an all-solid-state battery, It comprises a box body, one end of which is mounted with a first L-shaped plate, the top of which is mounted with a pole piece unwinding mechanism; the other end of which is mounted with a second L-shaped plate, the top of which is mounted with a pole piece rewinding mechanism; and the bottom end of which is equidistantly mounted with limited transport rollers; The electrode sheet winding mechanism includes a winding roller installed at one end of the top of the second L-shaped plate, a second transport roller is installed at one end of the top of the box body close to the second L-shaped plate, fixed plates are installed at the front and rear ends of the other end of the top of the second L-shaped plate, a connecting seat is installed at the opposite end of the fixed plate, L-shaped rods are telescopically installed at the upper and lower ends of the connecting seat, a clamping roller is installed at the opposite end of the L-shaped rod, and a film is wrapped around the outer wall of the clamping roller. In the process of the electrode sheet passing through the clamping roller, the wetted positive electrode sheet adheres the film to the surface of the electrode sheet, and the solution adhered to the outer surface of the positive electrode sheet is limited by the set film.

[0007] Preferably, grooves are provided at both upper and lower ends of the connecting seat, a spring is installed inside the groove, and the other end of the spring is connected to the vertical end of the L-shaped rod.

[0008] Preferably, a drying box is installed at the top center of the second L-shaped plate through a support seat, so that the pole piece enters the drying box 14 through a pressing roller for drying and is then stored by a winding roller.

[0009] Preferably, the pole piece unwinding mechanism comprises an unwinding roller installed at one end of the top of the first L-shaped plate, a first transport roller is installed at one end of the top of the box body close to the first L-shaped plate, and a tensioning roller is installed at the top center of the first L-shaped plate.

[0010] Preferably, the height of the tensioning roller is lower than that of the unwinding roller, so that the leading end of the electrode piece comes out from the top of the unwinding roller and passes through the bottom of the tensioning roller, enters the interior of the box and contacts the solution stored inside the box through the limiting transport roller.

[0011] Preferably, the positive electrode plate of the all-solid-state battery includes a positive electrode plate body, the positive electrode plate body includes a positive electrode collector layer arranged at the center, conductive connection layers are arranged at the upper and lower ends of the positive electrode collector layer, a positive electrode active material layer is arranged on the side of the conductive connection layer away from the positive electrode collector layer, and a solid electrolyte layer is arranged on the side of the positive electrode active material layer away from the conductive connection layer.

[0012] Preferably, the positive electrode current collector layer is made of aluminum foil, the conductive connection layer is made of epoxy conductive silver paste, and the positive electrode active material layer is made of lithium iron phosphate. The positive electrode current collector layer is made of aluminum foil and has good conductivity and mechanical strength. The conductive connection layer is made of epoxy conductive silver paste, which not only makes the positive electrode current collector layer and the positive electrode active material layer more closely connected, but also the epoxy conductive silver paste has good conductivity.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Uniform distribution of solid electrolyte and improvement of electrolyte adhesion: The present invention limits the solid electrolyte on the surface of the electrode piece by means of thin film adhesion. By wrapping a thin film on the outer wall of the pressing roller, the wetted electrode piece will adhere the thin film to the surface of the electrode piece when the electrode piece passes through the pressing roller. The set thin film will limit the solution adhered to the outer surface of the electrode piece, so that the solid electrolyte is more evenly distributed on the surface of the positive electrode piece, and it helps to enhance the adhesion of the solid electrolyte on the surface of the electrode piece, improve the adhesion effect, improve the conductivity of the positive electrode piece and the stability of the solid electrolyte, and thus improve the charging and discharging efficiency and energy density of the solid-state battery.

[0014] 2. Avoid solution dripping and improve material utilization efficiency: The present invention uses a film to limit the position during the transportation of the electrode, which effectively avoids the situation that the solution drips during transportation, thereby reducing product loss and waste and improving battery production efficiency. At the same time, during transportation, the thickness of the film wrapped around the outer wall of the pressing roller gradually decreases, and the two pressing rollers are kept close to the surface of the electrode by the set spring to avoid the situation that the film cannot adhere to the electrode; and the film limiting method is adopted, so that the film can fully lock the solid electrolyte solution on the outer surface of the electrode. In the process of drying and volatilization, the solid electrolyte can be fully attached to the surface of the positive electrode to improve the conductivity of the positive electrode. The solution is infiltrated on the outer surface of the electrode, and after drying and volatilization, the solid electrolyte is evenly distributed on the surface of the positive electrode, ensuring that the solution is fully absorbed and utilized, reducing the waste of solution, effectively improving the material utilization efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of a device for preparing a positive electrode sheet of an all-solid-state battery of the present invention; Figure 2 It is a side view connection diagram of the clamping roller and the connecting seat.

[0016] Figure 3 It is a structural schematic diagram of the positive electrode plate body; Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0017] In the figure: 1. Positive electrode sheet body; 2. Positive electrode current collector layer; 3. Conductive connection layer; 4. Positive electrode active material layer; 5. Solid electrolyte layer; 6. Box body; 7. First L-shaped plate; 8. Pole sheet unwinding mechanism; 801. Unwinding roller; 802. First transport roller; 803. Tensioning roller; 9. Second L-shaped plate; 10. Pole sheet winding mechanism; 1001. Winding roller; 1002. Second transport roller; 1003. Fixed plate; 1004. Connecting seat; 1005. L-shaped rod; 1006. Pressing roller; 11. Positioning transport roller; 12. Groove; 13. Spring; 14. Drying box. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0020] See also Figure 1-2 A device for preparing a positive electrode sheet of an all-solid-state battery includes a box body 6, a first L-shaped plate 7 is installed at one end of the box body 6, a pole sheet unwinding mechanism 8 is installed on the top of the first L-shaped plate 7, a second L-shaped plate 9 is installed at the other end of the box body 6, a pole sheet winding mechanism 10 is installed on the top of the second L-shaped plate 9, and limited transport rollers 11 are equidistantly installed at the bottom end of the box body 6.

[0021] like Figure 1-2As shown, the electrode unwinding mechanism 8 includes an unwinding roller 801 installed at one end of the top of the first L-shaped plate 7, a first transport roller 802 is installed at one end of the top of the box 6 close to the first L-shaped plate 7, a tensioning roller 803 is installed at the top center of the first L-shaped plate 7, and the height of the tensioning roller 803 is lower than the unwinding roller 801, and the electrode supported by the prior art is rolled up on the outer wall of the unwinding roller 801, and then the head end of the electrode first comes out from the top of the unwinding roller 801, and then passes through the bottom of the tensioning roller 803, and enters the inside of the box 6 after being wound on the top of the first transport roller 802, and then passes through the equidistantly arranged limiting transport rollers 11 to fully contact and infiltrate with the solution stored in the inside of the box 6.

[0022] like Figure 1-2 As shown, the pole piece winding mechanism 10 includes a winding roller 1001 installed at one end of the top of the second L-shaped plate 9, a second transport roller 1002 is installed at one end of the top of the box body 6 close to the second L-shaped plate 9, and fixed plates 1003 are installed at the front and rear ends of the other end of the top of the second L-shaped plate 9, and a connecting seat 1004 is installed at the opposite end of the fixed plate 1003. L-shaped rods 1005 are telescopically installed at the upper and lower ends of the connecting seat 1004, and a clamping roller 1006 is installed at the opposite end of the L-shaped rod 1005. The pole piece passing through the limiting transport roller 11 will pass around the top of the second transport roller 1002, and then pass through the center of the two clamping rollers 1006, and finally be wound up by the winding roller 1001.

[0023] like Figure 1-2 As shown, grooves 12 are provided at both upper and lower ends of the connecting seat 1004, and a spring 13 is installed inside the groove 12. The other end of the spring 13 is connected to the vertical end of the L-shaped rod 1005. A film is wrapped around the outer wall of the clamping roller 1006. When the electrode passes through the clamping roller 1006, the wetted electrode will adhere the film to the surface of the electrode. The film will limit the solution adhered to the outer surface of the electrode to avoid dripping of some solutions during the transportation of the electrode. Moreover, in the process of transporting the film along with the electrode, the thickness of the film wrapped around the outer wall of the clamping roller 1006 gradually decreases. At this time, the spring 13 is set to keep the two clamping rollers 1006 close to the surface that can always contact the electrode to avoid the situation where the film cannot adhere to the electrode.

[0024] like Figure 1-2 As shown, a drying box 14 is installed at the top center of the second L-shaped plate 9 through a support seat. The pole piece passes through the clamping roller 1006 and enters the drying box 14 for drying, and is finally rolled up and stored by the winding roller 1001.

[0025] See also Figure 3-4A positive electrode plate of an all-solid-state battery includes a positive electrode plate body 1, the positive electrode plate body 1 includes a positive electrode collector layer 2 arranged at the center, conductive connecting layers 3 are arranged at the upper and lower ends of the positive electrode collector layer 2, a positive electrode active material layer 4 is arranged on the side of the conductive connecting layer 3 away from the positive electrode collector layer 2, and a solid electrolyte layer 5 is arranged on the side of the positive electrode active material layer 4 away from the conductive connecting layer 3.

[0026] like Figure 3-4 As shown, the positive electrode current collector layer 2 is made of aluminum foil, the conductive connection layer 3 is made of epoxy conductive silver paste, and the positive electrode active material layer 4 is made of lithium iron phosphate. The positive electrode current collector layer 2 is made of aluminum foil and has good conductivity and mechanical strength. The conductive connection layer 3 is made of epoxy conductive silver paste, which not only makes the positive electrode current collector layer 2 and the positive electrode active material layer 4 more closely connected, but also the epoxy conductive silver paste has good conductivity.

[0027] Working principle: When in use, the positive electrode sheet is rolled up on the outer wall of the unwinding roller 801 of the electrode sheet unwinding mechanism 8, and then the head end of the electrode sheet first comes out from the top of the unwinding roller 801, and then passes through the bottom of the tensioning roller 803, and enters the box body 6 after being wound on the top of the first transport roller 802, and then passes through the equally spaced limiting transport rollers 11 to fully contact and soak with the solution stored in the box body 6. The electrode sheet passing through the limiting transport roller 11 will be wound around the top of the second transport roller 1002 of the electrode sheet winding mechanism 10, and then pass through the center of the two clamping rollers 1006, and finally be wound up by the winding roller 1001. By wrapping a film around the outer wall of the clamping roller 1006, When the electrode piece passes through the clamping roller 1006, the wetted electrode piece will adhere the film to the surface of the electrode piece. The set film will limit the solution adhering to the outer surface of the electrode piece to avoid dripping of some solutions during the transportation of the electrode piece. Moreover, when the film is transported along with the electrode piece, the thickness of the film wrapped around the outer wall of the clamping roller 1006 gradually decreases. At this time, the set spring 13 makes the two clamping rollers 1006 close to the surface that can always contact the electrode piece to avoid the situation that the film cannot adhere to the electrode piece. The electrode piece passing through the clamping roller 1006 enters the drying box 14 for drying, and is finally rolled up and stored by the winding roller 1001.

[0028] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for preparing a positive electrode sheet of an all-solid-state battery, It comprises a box body (6), characterized in that: A first L-shaped plate (7) is mounted on one end thereof, and a pole piece unwinding mechanism (8) is mounted on the top of the first L-shaped plate (7); a second L-shaped plate (9) is mounted on the other end thereof, and a pole piece rewinding mechanism (10) is mounted on the top of the second L-shaped plate (9); limited transport rollers (11) are mounted equidistantly at the bottom end thereof; the pole piece rewinding mechanism (10) comprises a rewinding roller (1001) mounted on one end of the top of the second L-shaped plate (9), a second transport roller (1002) is mounted on one end of the top of the box body (6) close to the second L-shaped plate (9), and two front and rear rollers (1003) are mounted on the other end of the top of the second L-shaped plate (9). A fixing plate (1003) is installed at one end, a connecting seat (1004) is installed at the opposite end of the fixing plate (1003), L-shaped rods (1005) are telescopically installed at both upper and lower ends of the connecting seat (1004), a pressing roller (1006) is installed at the opposite end of the L-shaped rod (1005), and a film (1007) is wrapped around the outer wall of the pressing roller (1006). When the electrode piece passes through the pressing roller (1006), the soaked positive electrode piece adheres the film (1007) to the surface of the electrode piece, and the solution adhered to the outer surface of the positive electrode piece is limited by the set film (1007).

2. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 1, characterized in that: The upper and lower ends of the connection seat (1004) are both provided with grooves (12), a spring (13) is installed inside the groove (12), and the other end of the spring (13) is connected to the vertical end of the L-shaped rod (1005).

3. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 2, characterized in that: A drying box (14) is installed at the top center of the second L-shaped plate (9) via a support seat, so that the pole piece enters the drying box 14 through a pressing roller (1006) for drying and is then stored by a winding roller (1001).

4. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 3, characterized in that: The pole piece unwinding mechanism (8) comprises an unwinding roller (801) mounted on one end of the top of the first L-shaped plate (7), a first transport roller (802) mounted on one end of the top of the box body (6) close to the first L-shaped plate (7), and a tensioning roller (803) mounted at the top center of the first L-shaped plate (7).

5. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 4, characterized in that: The height of the tensioning roller (803) is lower than that of the unwinding roller (801), so that the leading end of the electrode piece comes out from the top of the unwinding roller (801) and passes through the bottom of the tensioning roller (803), enters the interior of the box (6), and contacts the solution stored in the interior of the box (6) through the limiting transport roller (11).

6. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 1, characterized in that: The positive electrode sheet of the all-solid-state battery comprises a positive electrode sheet body (1), wherein the positive electrode sheet body (1) comprises a positive electrode current collector layer (2) arranged at the center, conductive connection layers (3) are arranged at both the upper and lower ends of the positive electrode current collector layer (2), a positive electrode active material layer (4) is arranged on the side of the conductive connection layer (3) away from the positive electrode current collector layer (2), and a solid electrolyte layer (5) is arranged on the side of the positive electrode active material layer (4) away from the conductive connection layer (3).

7. The device for preparing the positive electrode sheet of the all-solid-state battery according to claim 5, characterized in that: The positive electrode current collector layer (2) is made of aluminum foil, the conductive connection layer (3) is made of epoxy conductive silver glue, and the positive electrode active material layer (4) is made of lithium iron phosphate.

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