Positive electrode structure of lithium-manganese button cell and preparation equipment

Abstract

The utility model discloses a positive electrode structure of a lithium-manganese button cell and preparation equipment. The positive electrode structure comprises a stainless steel wire mesh current collection bowl and a positive electrode cake, the stainless steel wire mesh current collection bowl comprises a circular bowl bottom and an annular body which are formed by integrally stamping stainless steel wire mesh sheets; the annular body extends towards one side of the positive electrode cake around the circumference of the circular bowl bottom and wraps the annular periphery of the positive electrode cake; the circular bowl bottom is stamped to form current collection and diversion structures which are distributed in concentric circles and alternately concave and convex; the current collection and diversion structure comprises a circular central groove, an annular outer edge groove and a plurality of annular bulges and annular grooves which are positioned between the central groove and the outer edge groove. The positive electrode has the advantages that the manufacturing method is simple, and the stability of the positive electrode structure and the discharge performance of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-manganese button batteries, in particular to a positive electrode structure of a lithium-manganese button battery and a preparation device thereof. Background Art

[0002] In the field of lithium-manganese button batteries, the design of the current collector or positive electrode inner ring plays a crucial role in improving battery performance, stability, and extending battery life. The following is a brief introduction to existing related technologies.

[0003] The patent document entitled "Button Battery and Positive Electrode Shell Thereof" (CN201590436U) discloses a prior art technique for manufacturing a positive electrode current collector made of a metal mesh and a cake-shaped positive electrode material, and a technique for manufacturing a positive electrode current collector by welding the metal mesh to the positive electrode shell. While the structural arrangement of the metal mesh can support the cake-shaped positive electrode material and make the structure more robust, the bottom of the metal mesh contacts the positive electrode shell, which expands and hinders the flow of electrolyte, affecting electrical performance. Furthermore, the side edges of the positive electrode cake are prone to chipping and collapse during processing and subsequent discharge, further affecting battery performance.

[0004] The patent document entitled "A current collecting cover for lithium manganese button batteries (CN212783514U)" discloses a current collecting cover that is cylindrical in shape as a whole, with an open upper end and four vertical plates extending upward from the periphery of the bottom of the cylinder to form the side walls of the cylinder. The number of vertical plates is 3 to 6 to provide more electrolyte storage space and to be in close contact with the positive electrode shell, thereby reducing contact impedance and lowering the internal resistance of the battery. However, although it provides more electrolyte storage space, the structure may be more complicated, increasing manufacturing costs and assembly difficulty. At the same time, the increase in the number of vertical plates may affect the overall mechanical stability of the battery.

[0005] The patent document entitled "A positive electrode sheet current collector for lithium-manganese button batteries (CN208889763U)" discloses a current collector comprising a metal edge ring and a cross-shaped metal connector, which contacts the bottom of the positive electrode sheet during operation to provide good conductivity. The gap between the cross-shaped metal connector and the metal edge ring is used to store electrolyte to compensate for volatilized electrolyte and maintain sufficient electrolyte. However, this structure still has the problem of inconvenient processing, and the design of the metal connector may lead to uneven distribution of electrolyte, affecting battery performance.

[0006] In the design of lithium-manganese button batteries, balancing cost and performance is a complex optimization problem, which requires finding a suitable solution between material selection, manufacturing process, design innovation and performance requirements. The above-mentioned existing technologies are difficult to take into account both cost and performance at the same time, so further optimization of the positive electrode of lithium-manganese button batteries is needed. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a positive electrode structure of a lithium manganese button battery with a simple manufacturing method, which can improve the positive electrode structure stability and battery discharge performance, and to provide a preparation device that can continuously produce the positive electrode structure.

[0008] The technical solution adopted by the utility model to solve the above technical problems is as follows: the positive electrode structure of the lithium manganese button battery includes a stainless steel wire mesh current collecting bowl and a positive electrode cake;

[0009] The stainless steel wire mesh collector bowl comprises a circular bowl bottom and an annular body integrally formed by stamping a stainless steel wire mesh sheet;

[0010] The annular body extends toward one side of the positive electrode cake around the circumference of the circular bowl bottom and surrounds the annular outer circumference of the positive electrode cake;

[0011] The circular bowl bottom is formed by stamping into a current collecting and conducting structure with concentric circles distributed and alternately concave and convex;

[0012] The current collecting and conducting structure comprises a circular central groove, an annular outer groove, and a plurality of annular protrusions and annular grooves located between the central groove and the outer groove.

[0013] The preferred technical solution adopted by the present invention to solve the above technical problems is: the stainless steel wire mesh collector bowl and the positive electrode cake are pressed together so that the positive electrode cake forms a downward point bulge in the mesh holes at the bottom of the circular bowl.

[0014] The preferred technical solution adopted by the present invention to solve the above technical problem is: an inward-buckling edging is provided on the upper edge of the annular body.

[0015] The preferred technical solution adopted by the present invention to solve the above technical problems is: the diameter range of the stainless steel wire mesh collector bowl is 15.7-15.9mm, the diameter range of the central groove is 5.5-5.7mm, and the width range of the outer groove is 1.1-1.3mm.

[0016] The preferred technical solution adopted by the present invention to solve the above technical problem is that the annular protrusions and the annular grooves are of equal width.

[0017] Another technical solution adopted by the present invention to solve the above technical problems is: a preparation device for the positive electrode structure of a lithium-manganese button battery, comprising a positive electrode powder feeding module, a strip stainless steel wire mesh feeding module and an integrated positive electrode pressing module integrated on a frame; the integrated positive electrode pressing module comprises a main module and an auxiliary module;

[0018] The main module includes a main forming turntable, an upper supporting turntable, a lower supporting turntable and a cake pressing mold assembly; the main forming turntable, the upper supporting turntable and the lower supporting turntable are integrated on the main rotating seat and rotate synchronously;

[0019] The cake pressing die assembly includes a plurality of cake pressing lower dies and cake pressing upper dies; each cake pressing upper die is integrated on the upper supporting turntable, and each cake pressing lower die is integrated on the lower supporting turntable;

[0020] The main forming turntable is evenly distributed with a plurality of main station through holes in an annular shape, and each cake pressing lower die and cake pressing upper die always correspond to the corresponding main station through hole up and down;

[0021] The upper supporting turntable is provided with an annular supporting rail which fluctuates up and down in the height direction, and the upper die for pressing the cake moves up and down along the fluctuation of the annular supporting rail;

[0022] The positive electrode powder feeding module is docked with the main module to form a pre-pressing position. In each forming cycle, a main station through hole of the main forming turntable and the corresponding pressing lower mold and pressing upper mold enter the pre-pressing position to realize pre-pressing.

[0023] The auxiliary module includes an auxiliary forming turntable, a punching die, a pre-pressing die and a forming die; the strip stainless steel wire mesh feeding module is connected to the position where the punching die is located;

[0024] The lower surface of the forming die has a circular shaping groove, and the bottom surface of the circular shaping groove has a concave-convex structure distributed in concentric circles and alternating with each other;

[0025] The auxiliary forming turntable is provided with a plurality of auxiliary station through holes, and one side of the auxiliary forming turntable extends between the main forming turntable and the upper supporting turntable;

[0026] The auxiliary forming turntable rotates on its own, and in each forming cycle, an auxiliary station through hole of the auxiliary forming turntable is opposite to a main station through hole of the main forming turntable to form a forming station, and the forming mold is opposite to the forming station;

[0027] The through hole of the auxiliary station preceding the forming station corresponds to the pre-pressing die, and the through hole of the auxiliary station following the forming station corresponds to the punching die.

[0028] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: the punching die cuts the strip-shaped stainless steel wire mesh in the corresponding auxiliary station through-hole to form a stainless steel wire mesh disc; the auxiliary station through-hole with the stainless steel wire mesh disc is transferred to the pre-pressing die as the auxiliary forming turntable rotates;

[0029] The pre-pressing die forms an expanded stainless steel wire mesh bowl with the outer edge of the stainless steel wire mesh disc in the through hole of the corresponding auxiliary station;

[0030] The auxiliary station through hole with the expanded stainless steel wire mesh bowl is transferred to the forming station as the auxiliary forming turntable rotates and passes through the corresponding auxiliary station through hole to be buckled onto the pre-pressed cake in the corresponding main station through hole;

[0031] The forming die is passed through the corresponding auxiliary station through-hole to perform shaping and stamping on the expanded stainless steel wire mesh bowl and the pre-pressed cake to form the positive electrode structure of the lithium manganese button battery.

[0032] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: the upper surface of the annular support rail is an undulating track surface; an upper rolling wheel is provided on the outer side of the upper cake pressing mold; the upper rolling wheel is placed on the track surface and moves up and down with the undulation of the track surface;

[0033] A lower rolling wheel is provided at the bottom of the lower cake pressing mold; the lower rolling wheel is placed on the lower supporting turntable and rotates; a push rod assembly is provided in the lower cake pressing mold, and the push rod assembly is driven to move upward to discharge the contents in the main station through hole.

[0034] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: a detection station is provided after the pre-pressing cake station, an impact detection module is provided on the upper side of the detection station and a cake discharge mechanism is provided on the side;

[0035] When the pre-pressed cake located in the main forming through hole moves with the main forming turntable to the lower side of the impact detection module and detects an abnormality, the ejection mechanism of the corresponding cake lower mold rises to eject the abnormal cake, and the cake discharge mechanism discharges the ejected abnormal cake out of the main module.

[0036] The preferred technical solution adopted by the present invention to solve the above technical problems is: the punching die, pre-pressing die and forming die are integrated on a lower pressing plate module, and the lower pressing plate module is driven by a cylinder to move downward so that the components in different workstations can complete corresponding operations.

[0037] Compared with the prior art, the advantages of the present invention are:

[0038] First, the concave-convex structure design provides expansion gap for the positive electrode cake, which is conducive to the stability of the battery structure and the optimization of electrical performance.

[0039] Second, the arrangement of the concentric grooves creates a gap between the outer bottom surface of the positive electrode structure and the inner surface of the positive electrode shell, which is conducive to storing more electrolyte and improving battery performance.

[0040] Third, the concave-convex structure of the concentric circles makes it easier for the spaced annular protrusions to contact the positive electrode shell uniformly and closely in the circumferential direction, avoiding the poor contact problem caused by poor flatness of a single plane and reducing the internal contact resistance; Fourth, the concave-convex structure distributed in concentric circles and alternating with each other increases the strength of the entire positive electrode structure, making it less likely for the positive electrode structure to be damaged during the battery molding process.

[0041] Fourth, an outer groove is set on the periphery of the stainless steel wire mesh collector bowl, which not only avoids the corners of the positive electrode shell that are difficult to control in precision and avoids the poor assembly problem caused by the corners of the two contacting each other, but also the outer groove is more conducive to the bottom introduction of the electrolyte.

[0042] Fifth, the annular body protects the outer periphery of the positive electrode cake, not only protecting the positive electrode cake during subsequent production and preventing edge damage, but also providing better positioning when the positive electrode cake undergoes radial expansion.

[0043] Sixth, the stainless steel wire mesh collector bowl is directly machined from stainless steel wire mesh. This not only utilizes the mesh's inherent pore structure to facilitate electrolyte interaction, but also allows for a closer bond between the positive electrode cake and the collector bowl, providing space for expansion. Furthermore, the stainless steel wire mesh offers increased flexibility, increasing the strength of the positive electrode structure while maintaining a certain degree of pliability, facilitating press-fitting with the positive electrode cake and the coordination between the positive electrode structure and the positive electrode shell.

[0044] Seventh, the equipment includes a cathode powder feeding module, a strip stainless steel wire mesh feeding module, and an integrated cathode pressing module. The integrated cathode pressing module includes a main module for cake making and an auxiliary module for bowl making. By integrating these modules, a single device can simultaneously complete the pre-pressing of powder and the cutting and pre-pressing of stainless steel wire mesh. Through the intersection of two rotating bodies, the prefabricated flared stainless steel wire mesh bowl is buckled onto the prefabricated cathode cake to form the body to be pressed. The final pressing is completed at the intersection of the modules, thereby achieving continuous production and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may contain exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0046] Figure 1 Schematic diagram of the preparation method of the positive electrode structure of the lithium manganese button battery;

[0047] Figure 2 This is a schematic diagram of the decomposition of the positive electrode structure of a lithium-manganese button battery;

[0048] Figure 3 Schematic diagram of the stainless steel wire mesh collector bowl in the positive electrode structure Figure 1 ;

[0049] Figure 4 Schematic diagram of the stainless steel wire mesh collector bowl in the positive electrode structure Figure 2;

[0050] Figure 5 A schematic diagram of a device for preparing a positive electrode structure of a lithium-manganese button battery;

[0051] Figure 6 This is the workstation layout diagram of the equipment for preparing the positive electrode structure of lithium-manganese button batteries. DETAILED DESCRIPTION

[0052] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0053] It should be noted that like reference numerals denote like items in the following drawings, and therefore, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.

[0054] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is usually placed when in use. They 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 direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0055] like Figure 1 As shown, the preparation method of the positive electrode structure 6 of the lithium manganese button battery includes the following steps:

[0056] Step A: Pressing the positive electrode powder 1 into a prefabricated positive electrode cake 2.

[0057] Step B: cutting the strip-shaped stainless steel wire mesh 30 to form a stainless steel wire mesh disc 3.

[0058] Step C: stamping the outer edge of the stainless steel wire mesh disc 3 to form a flared stainless steel wire mesh bowl 4, the depth of the flared stainless steel wire mesh bowl 4 being less than the height of the prefabricated positive electrode cake 2.

[0059] Step D: buckle the expanded stainless steel wire mesh bowl 4 onto the prefabricated positive electrode cake 2 to form a body to be pressed 5.

[0060] Step E: The object to be pressed 5 is placed on the lower mold with the flared stainless steel wire mesh bowl 4 on top and the prefabricated positive electrode cake 2 at the bottom. The upper mold having a concentric circle distribution and alternating concave and convex structure presses the object to be pressed 5 downward to form the positive electrode structure 6 of the lithium manganese button battery.

[0061] like Figure 1-2As shown, the positive electrode structure 6 of the lithium manganese button battery includes a stainless steel wire mesh collector bowl 61 formed by the expanded stainless steel wire mesh bowl 4 being compressed twice, and a positive electrode cake 62 formed by the expanded stainless steel wire mesh bowl 4 being compressed twice.

[0062] like Figure 2-3 As shown, the stainless steel wire mesh current collecting bowl 61 comprises a circular bowl base 611 and an annular body 612. The annular body 612 extends around the circumference of the circular bowl base 611 toward the positive electrode cake 62 and surrounds the annular outer periphery of the positive electrode cake 62. The circular bowl base 611 is stamped to form a current collecting and conducting structure with alternating concave and convex shapes arranged in concentric circles. The current collecting and conducting structure includes a circular central groove a, an annular outer groove b, and several annular protrusions c and annular grooves d located between the central groove a and the outer groove b.

[0063] The positive electrode cake 62 is pressure-formed through two stages: pre-pressing in step A and stamping in step E. This results in a more uniform interior, improved strength, and less prone to cake breakage. The annular body 612 protects the annular periphery of the positive electrode cake 62 during subsequent production, preventing edge damage. It also effectively limits radial expansion of the positive electrode cake 62.

[0064] It should be noted that after forming, the stainless steel wire mesh collector bowl 61 and the positive electrode cake 62 are pressed together, forming a downward protrusion on the positive electrode cake 62 within the mesh of the circular bowl bottom 611. This protrusion increases the specific surface area of ​​the positive electrode cake 62 and the contact area with the stainless steel wire mesh collector bowl 61, which is more beneficial to electrical performance. It also strengthens the bonding between the two and prevents separation.

[0065] In this embodiment, the stainless steel wire mesh collector bowl 61 is directly formed from stainless steel wire mesh. This not only utilizes the mesh's pore structure to facilitate electrolyte interaction, but also allows the positive electrode cake 62 to achieve a closer bond with the collector bowl through the pore structure, providing space for expansion. Furthermore, the stainless steel wire mesh offers enhanced flexibility, increasing the strength of the positive electrode structure 6 while maintaining a certain degree of pliability, further facilitating press-fitting with the positive electrode cake 62 and the fit between the positive electrode structure 6 and the positive electrode housing.

[0066] Compared with collector bowls made by fine processing of other conductive sheets, this preparation method has a simpler and more cost-effective molding process, does not require complicated fine processing and molding procedures, and can easily achieve synchronous and continuous production on a single production line.

[0067] The current collecting and conducting structure with concentric circle distribution and alternating concave and convex has the following advantages: First, the concave-convex structure design provides an expansion gap for the positive electrode cake 62, which is beneficial to the stability of the battery structure and the optimization of electrical performance; Second, the setting of the central groove a, the outer groove b and the annular groove d forms a gap between the outer bottom surface of the positive electrode structure 6 and the inner surface of the positive electrode shell, which is beneficial to the storage of more electrolyte, enhances the tightness and conductivity between the positive electrode structure 6 and the positive electrode shell, reduces the internal resistance, and is beneficial to improve the battery performance; Third, the concave-convex structure of the concentric circles makes it easier for the spaced annular protrusions c to be in close and uniform contact with the positive electrode shell in the circumferential direction, avoids the poor contact problem caused by the poor flatness of a single plane, and reduces the contact internal resistance; Fourth, the concentric circle distribution and alternating concave-convex structure increase the strength of the entire positive electrode structure 6, and it is not easy for the positive electrode structure 6 to be damaged during the battery molding process.

[0068] Preferably, an outer groove b is provided on the periphery of the stainless steel wire mesh collector bowl 61, which not only avoids the corners of the positive electrode shell that are difficult to control in precision and avoids the problem of poor assembly caused by the corners of the two abutting against each other, but also the outer groove b is more conducive to the bottom introduction of the electrolyte.

[0069] Preferably, if Figure 3 As shown, an inward-buckling edge e is provided on the upper edge of the annular body 612. The edge e protects the edge of the positive electrode cake 62 and prevents the corners of the positive electrode cake 62 from being damaged.

[0070] like Figure 4 As shown, the stainless steel wire mesh collector bowl 61 has a diameter ranging from 15.7 to 15.9 mm, a central groove a with a diameter ranging from 5.5 to 5.7 mm, and an outer groove b with a width ranging from 1.1 to 1.3 mm. The annular protrusions c and annular grooves d are of equal width. This dimensional design ensures more uniform strength across the structure, enhancing overall structural stability.

[0071] This embodiment also provides a device for preparing the positive electrode structure 6 of a lithium-manganese button battery, which is used to prepare the positive electrode structure 6 of the lithium-manganese button battery as described above.

[0072] like Figure 5-6 As shown, the preparation equipment includes a positive electrode powder feeding module 100, a strip stainless steel wire mesh feeding module 200 and an integrated positive electrode pressing module 300 integrated on a frame. The integrated positive electrode pressing module 300 includes a main module 301 and an auxiliary module 302.

[0073] The main module 301 includes a main forming turntable 31, an upper supporting turntable 32, a lower supporting turntable 33, and a press mold assembly. The main forming turntable 31, upper supporting turntable 32, and lower supporting turntable 33 are integrated on a main rotating base and rotate synchronously. The press mold assembly includes multiple lower press molds 34 and upper press molds 35. Each upper press mold 35 is integrated on the upper supporting turntable 32, and each lower press mold 34 is integrated on the lower supporting turntable 33.

[0074] The main forming turntable 31 is evenly distributed with multiple main station through-holes m. Each lower and upper die 34, 35, is aligned vertically with a corresponding main station through-hole m. The upper support turntable 32 is equipped with an annular support rail y that undulates vertically, along which the upper die 35 moves. The positive electrode powder feed module 100 docks with the main module 301, forming a pre-pressing position s. During each forming cycle, a main station through-hole m on the main forming turntable 31 and the corresponding lower and upper die 34, 35 enter the pre-pressing position s to achieve pre-pressing.

[0075] The auxiliary module 302 includes an auxiliary forming turntable 36, a punching die 37, a pre-pressing die 38 and a forming die 39. The strip stainless steel wire mesh feeding module 200 is connected to the position where the punching die 37 is located. The lower surface of the forming die 39 has a circular shaping groove, and the bottom surface of the circular shaping groove has a concave and convex structure distributed in concentric circles and alternating with each other. The auxiliary forming turntable 36 is provided with a plurality of auxiliary station through holes n, and one side of the auxiliary forming turntable 36 extends between the main forming turntable 31 and the upper support turntable 32. The auxiliary forming turntable 36 rotates on its own, and in each forming cycle, an auxiliary station through hole n of the auxiliary forming turntable 36 is opposite to a main station through hole m of the main forming turntable 31 to form a forming station k, and the forming die 39 is opposite to the forming station k. The auxiliary station through hole n preceding the forming station corresponds to the pre-pressing die 38, and the auxiliary station through hole n next preceding the forming station corresponds to the punching die 37.

[0076] The punching die 37 cuts the strip of stainless steel mesh in the corresponding auxiliary station through-hole n into a stainless steel mesh disc 3. The auxiliary station through-hole n with the stainless steel mesh disc 3 is transferred to the pre-pressing die 38 as the auxiliary forming turntable 36 rotates. The pre-pressing die 38 forms the outer edge of the stainless steel mesh disc 3 in the corresponding auxiliary station through-hole n into a flared stainless steel mesh bowl 4.

[0077] The auxiliary station through-hole n, containing the expanded stainless steel mesh bowl 4, rotates with the auxiliary forming turntable 36 and is transferred to the forming station. The through-hole n passes through the corresponding auxiliary station through-hole n and latches onto the pre-pressed cake within the corresponding main station through-hole m. A forming die 39 passes through the corresponding auxiliary station through-hole n, shaping and stamping the expanded stainless steel mesh bowl 4 and the pre-pressed cake to form the positive electrode structure 6 of the lithium-manganese button cell.

[0078] Through such an integrated device, the pre-pressing of powder and the cutting and pre-pressing of stainless steel wire mesh can be completed simultaneously on one device. Through the intersection of the two rotating bodies, the prefabricated flared stainless steel wire mesh bowl 4 is buckled on the prefabricated positive electrode cake 2 to form a body to be pressed 5, and the final pressing is completed at the junction of the modules, thereby realizing continuous production and improving production efficiency.

[0079] like Figure 5 As shown, the punching die 37, the pre-pressing die 38 and the forming die 39 are integrated on a lower pressing plate die set, and the lower pressing plate die set is driven by a cylinder to move downward so that the components in different stations can complete the corresponding operations.

[0080] In this embodiment, a blanking module 500 is also provided, and a push rod assembly is provided in the lower cake mold 34. The push rod assembly is driven upward to discharge the contents in the main workstation through hole m. When the main forming turntable 31 rotates to the blanking module 500, the ejection mechanism of the lower cake mold 34 rises to eject the positive electrode structure 6 and output it to the next process through the blanking module 500.

[0081] like Figure 5 As shown, the upper surface of the annular support rail y is an undulating track surface. An upper roller 41 is mounted on the outer side of the upper die 35. This roller 41 rests on the track surface and moves up and down with the undulations of the track surface. A lower roller 42 is mounted on the bottom of the lower die 34. This lower roller 42 rotates on the lower support turntable 33.

[0082] like Figure 5-6 As shown, the unloading module 500 is connected to the downwardly inclined cake unloading slide 43, which is provided with a plurality of powder leakage holes. A blocking member 44 is provided between the unloading station v and the pre-pressing cake position s to prevent the positive electrode structure from entering the pre-pressing cake position s.

[0083] like Figure 6 As shown, several subsequent stations of the pre-pressed cake station s are provided with a detection station p, and an impact detection module is provided on the upper side of the detection station p and a cake discharge mechanism is provided on the side.

[0084] When the pre-pressed cake located in the through hole m of the main work station moves with the main forming turntable 31 to the lower side of the impact detection module and detects an abnormality, the ejector rod assembly in the corresponding cake pressing lower mold 34 will eject the abnormal cake, and the cake discharge mechanism will discharge the ejected abnormal cake out of the main module 301.

[0085] This article introduces the positive electrode structure and manufacturing equipment for the lithium-manganese button cell provided by this utility model. Specific examples are used to illustrate the principles and implementation methods of this utility model. The above examples are intended only to facilitate understanding of this utility model and its core concept. It should be noted that those skilled in the art may make various improvements and modifications to this utility model without departing from the principles of this utility model, and such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. The positive electrode structure of the lithium manganese button battery is characterized by: Includes stainless steel wire mesh collector bowl and positive electrode cake; The stainless steel wire mesh collector bowl comprises a circular bowl bottom and an annular body integrally formed by stamping a stainless steel wire mesh sheet; The annular body extends toward one side of the positive electrode cake around the circumference of the circular bowl bottom and surrounds the annular outer circumference of the positive electrode cake; The circular bowl bottom is formed by stamping into a current collecting and conducting structure with concentric circles and alternating concave and convex shapes; The current collecting and conducting structure comprises a circular central groove, an annular outer groove, and a plurality of annular protrusions and annular grooves located between the central groove and the outer groove.

2. The positive electrode structure of the lithium manganese button battery according to claim 1, characterized in that: The stainless steel wire mesh current collecting bowl and the positive electrode cake are pressed together so that the positive electrode cake forms a downward point bulge in the mesh holes at the bottom of the circular bowl.

3. The positive electrode structure of the lithium-manganese button battery according to claim 1, characterized in that: The upper edge of the annular body is provided with an inward-buckling edging.

4. The positive electrode structure of the lithium-manganese button battery according to claim 1, characterized in that: The diameter of the stainless steel wire mesh collector bowl ranges from 15.7 to 15.9 mm, the diameter of the central groove ranges from 5.5 to 5.7 mm, and the width of the outer groove ranges from 1.1 to 1.3 mm.

5. The positive electrode structure of the lithium manganese button battery according to claim 1, characterized in that: The annular protrusions and annular grooves are of equal width.

6. A device for preparing a positive electrode structure for a lithium-manganese button battery, for preparing the positive electrode structure for a lithium-manganese button battery according to claim 1, characterized in that: It includes a positive electrode powder feeding module, a strip stainless steel wire mesh feeding module and an integrated positive electrode pressing module integrated on a frame; the integrated positive electrode pressing module includes a main module and an auxiliary module; The main module includes a main forming turntable, an upper supporting turntable, a lower supporting turntable and a cake pressing mold assembly; the main forming turntable, the upper supporting turntable and the lower supporting turntable are integrated on the main rotating seat and rotate synchronously; The cake pressing die assembly includes a plurality of cake pressing lower dies and cake pressing upper dies; each cake pressing upper die is integrated on the upper supporting turntable, and each cake pressing lower die is integrated on the lower supporting turntable; The main forming turntable is evenly distributed with a plurality of main station through holes in an annular shape, and each cake pressing lower die and cake pressing upper die always correspond to the corresponding main station through hole up and down; The upper supporting turntable is provided with an annular supporting rail which fluctuates up and down in the height direction, and the upper die for pressing the cake moves up and down along the fluctuation of the annular supporting rail; The positive electrode powder feeding module is docked with the main module to form a pre-pressing position. In each forming cycle, a main station through hole of the main forming turntable and the corresponding pressing lower mold and pressing upper mold enter the pre-pressing position to realize pre-pressing. The auxiliary module includes an auxiliary forming turntable, a punching die, a pre-pressing die and a forming die; the strip stainless steel wire mesh feeding module is connected to the position where the punching die is located; The lower surface of the forming die has a circular shaping groove, and the bottom surface of the circular shaping groove has a concave-convex structure distributed in concentric circles and alternating with each other; The auxiliary forming turntable is provided with a plurality of auxiliary station through holes, and one side of the auxiliary forming turntable extends between the main forming turntable and the upper supporting turntable; The auxiliary forming turntable rotates on its own, and in each forming cycle, an auxiliary station through hole of the auxiliary forming turntable is opposite to a main station through hole of the main forming turntable to form a forming station, and the forming mold is opposite to the forming station; The through hole of the auxiliary station preceding the forming station corresponds to the pre-pressing die, and the through hole of the auxiliary station following the forming station corresponds to the punching die.

7. The equipment for preparing the positive electrode structure of the lithium manganese button battery according to claim 6, characterized in that The punching die cuts the strip of stainless steel wire mesh in the corresponding auxiliary station through hole to form a stainless steel wire mesh disc; the auxiliary station through hole with the stainless steel wire mesh disc is transferred to the pre-pressing die as the auxiliary forming turntable rotates; The pre-pressing die forms an expanded stainless steel wire mesh bowl with the outer edge of the stainless steel wire mesh disc in the through hole of the corresponding auxiliary station; The auxiliary station through hole with the expanded stainless steel wire mesh bowl is transferred to the forming station as the auxiliary forming turntable rotates and passes through the corresponding auxiliary station through hole to be buckled onto the pre-pressed cake in the corresponding main station through hole; The forming die is passed through the corresponding auxiliary station through-hole to perform shaping and stamping on the expanded stainless steel wire mesh bowl and the pre-pressed cake to form the positive electrode structure of the lithium manganese button battery.

8. The equipment for preparing the positive electrode structure of the lithium-manganese button battery according to claim 6, characterized in that: The upper surface of the annular support rail is an undulating track surface; an upper rolling wheel is provided on the outer side of the upper die of the cake pressing; the upper rolling wheel is placed on the track surface and moves up and down with the undulation of the track surface; A lower rolling wheel is provided at the bottom of the lower cake pressing mold; the lower rolling wheel is placed on the lower supporting turntable and rotates; a push rod assembly is provided in the lower cake pressing mold, and the push rod assembly is driven to move upward to discharge the contents in the main station through hole.

9. The equipment for preparing the positive electrode structure of the lithium-manganese button battery according to claim 8, characterized in that: A detection station is provided after the pre-pressing cake station, and an impact detection module is provided on the upper side of the detection station and a cake discharge mechanism is provided on the side; When the pre-pressed cake located in the main forming through hole moves with the main forming turntable to the lower side of the impact detection module and detects an abnormality, the ejection mechanism of the corresponding cake lower mold rises to eject the abnormal cake, and the cake discharge mechanism discharges the ejected abnormal cake out of the main module.

10. The equipment for preparing the positive electrode structure of the lithium manganese button battery according to claim 7, characterized in that: The punching die, pre-pressing die and forming die are integrated on a lower pressing plate die set, and the lower pressing plate die set is driven by a cylinder to move downward so that the components in different workstations can complete corresponding operations.

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