Pole piece hot pressing device and battery manufacturing equipment

Abstract

The utility model discloses a pole piece hot-pressing device and battery manufacturing equipment, the pole piece hot-pressing device comprises a hot-pressing mechanism and a rotating mechanism, the hot-pressing mechanism comprises an upper pressing plate and a lower pressing plate which are oppositely arranged, and the upper pressing plate and the lower pressing plate can oppositely move along a first direction. The rotating mechanism comprises a lower rotating shaft, a lower rotating plate and a lower elastic pressing pad. The lower rotating plate is arranged between the upper pressing plate and the lower pressing plate. The lower elastic pressing pad is arranged on the side, facing the upper pressing plate, of the lower rotating plate and can stretch out and draw back in the first direction. The lower rotating shaft is connected to one side of the lower rotating plate in the second direction, the lower rotating shaft rotates to drive the lower rotating plate to rotate around the lower rotating shaft, and the second direction is perpendicular to the first direction so that the lower elastic pressing pad can be moved out of the space between the upper pressing plate and the lower pressing plate. According to the pole piece hot-pressing device and the battery manufacturing equipment, the hot-pressing efficiency of the electrode pole piece can be improved, so that the operation efficiency and stability of the battery monomer are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a pole piece hot pressing device and battery manufacturing equipment. Background Art

[0002] During the manufacturing process of battery cells, the stacked pole pieces need to be laminated to increase the connection strength between the pole pieces, so as to improve the efficiency and stability of the battery cell operation process.

[0003] At present, how to improve the efficiency of hot pressing of pole pieces by laminating equipment is also one of the research issues in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a pole piece hot pressing device and a battery manufacturing equipment, which can improve the efficiency of hot pressing of electrode pole pieces, so as to improve the efficiency and stability of battery cell operation.

[0005] In the first aspect, the present application provides a pole piece hot pressing device, including a hot pressing mechanism and a rotating mechanism, wherein the hot pressing mechanism includes an upper pressing plate and a lower pressing plate that are arranged opposite to each other, and the upper pressing plate and the lower pressing plate can move toward each other along a first direction. The rotating mechanism includes a lower rotating shaft, a lower rotating plate and a lower elastic pad, and the lower rotating plate is arranged between the upper pressing plate and the lower pressing plate. The lower elastic pad is arranged on the side of the lower rotating plate facing the upper pressing plate, and the lower elastic pad can be extended and retracted along the first direction. The lower rotating shaft is connected to one side of the lower rotating plate along the second direction, and the rotation of the lower rotating shaft drives the lower rotating plate to rotate around the lower rotating shaft, and the second direction is perpendicular to the first direction, so as to move the lower elastic pad out of the space between the upper pressing plate and the lower pressing plate.

[0006] In the technical solution of the embodiment of the present application, a hot pressing mechanism is provided to perform hot pressing on the electrode plates, thereby improving the compaction between the electrode plates and improving the efficiency and stability of the battery cell operation. In the rotating mechanism, a lower spring pad is provided, and the lower spring pad can be deformed during the hot pressing process to balance the pressure at various locations of the electrode plates, thereby increasing the pressure on the thinning area of ​​the electrode plates and increasing the connection strength of the thinning area plates. In addition, by providing a lower rotating plate to support the lower spring pad, the lower rotating shaft drives the lower rotating plate to rotate, so that the lower spring pad can be easily removed from between the upper pressing plate and the lower pressing plate, which is convenient for the replacement and assembly of the lower spring pad, thereby improving the assembly efficiency of the lower spring pad and thus improving the efficiency of hot pressing of the electrode plates.

[0007] In some embodiments, the rotating mechanism further includes an upper rotating shaft, an upper rotating plate, and an upper spring pad, wherein the upper rotating plate is disposed between the upper pressure plate and the lower rotating plate, and the upper spring pad is disposed on the side of the upper rotating plate facing the lower rotating plate, and the upper rotating shaft rotates to drive the upper rotating plate to rotate around the second direction to move the upper spring pad out of the space between the upper pressure plate and the lower pressure plate. In the above structure, by providing the upper rotating shaft and the upper rotating plate, the compaction strength of the electrode sheet thinning area is further improved, and the efficiency and operating stability of the battery cell are improved.

[0008] In some embodiments, the upper spring pad includes any one of a silicone pad, an expansion pad, and a polyimide pad, and the lower spring pad includes any one of a silicone pad, an expansion pad, and a polyimide pad. In the above structure, the above pad can be adaptively filled into the thinning area by deformation to compensate for the pressure in the thinning area, thereby increasing the pressure in the thinning area and improving the compaction effect of the electrode plate.

[0009] In some embodiments, the thickness H1 of the upper spring pad is: 0.2mm≤H1≤5mm, and the thickness H2 of the lower spring pad is: 0.2mm≤H2≤5mm. The above thickness range can be deformed under the action of the hot pressing mechanism, and can effectively squeeze the thinning area of ​​the electrode sheet, thereby improving the overall compactness of the electrode sheet and reducing the risk of the sheet falling off in the thinning area.

[0010] In some embodiments, the lower spring pad is used to support the electrode pole piece, and the lower spring pad includes a main body and a first convex portion. The main body is provided on the surface of the lower rotating plate, and the main body is provided corresponding to the main part of the electrode pole piece. The first convex portion, the main body protrudes toward the surface of the upper pressure plate, and the first convex portion is provided corresponding to the thinning area of ​​the electrode pole piece. In the above structure, the large surface of the electrode pole piece is buffered by providing the main body, and the pressure is evenly buffered to the main surface of the entire electrode pole piece, thereby improving the flatness and density of the main surface. The first convex portion is provided to increase the extrusion force on the thinning area, compensate for the relative depression of the thinning area, and improve the connection strength of the thinning area of ​​the electrode pole piece, thereby improving the overall efficiency and operation stability of the battery cell.

[0011] In some embodiments, the rotating mechanism further includes a lifting device disposed between the lower rotating plate and the lower pressing plate, the lifting device being used to drive the lower rotating plate to move away from the lower pressing plate in a first direction. By providing the lifting device, the lower rotating plate is separated from the lower pressing plate, the efficiency of the movement of the lower rotating plate is improved, and the lower rotating plate is convenient to rotate to replace the lower spring pad.

[0012] In some embodiments, the rotating mechanism further comprises a driving motor connected to the lower rotating shaft, and the driving motor drives the lower rotating shaft to rotate. In the above structure, by setting the driving motor to drive the lower rotating shaft to rotate to drive the lower rotating plate to rotate, the efficiency of the lower rotating plate rotation is improved, and the speed of replacing the lower spring pad is improved.

[0013] In some embodiments, the pole piece hot pressing device further includes a hot pressing drive mechanism, the hot pressing drive mechanism includes a first hot pressing motor, the first hot pressing motor is connected to the upper pressing plate, and the first hot pressing motor can drive the upper pressing plate to move along the first direction toward the lower pressing plate. In the above structure, by setting the hot pressing drive mechanism, the upper pressing plate is driven to press downward to apply pressure to the electrode pole piece, thereby improving the efficiency of the downward pressing.

[0014] In some embodiments, the hot pressing drive mechanism further includes a second hot pressing motor, which is connected to the lower pressing plate, and the second hot pressing motor can drive the lower pressing plate to move toward the upper pressing plate along the first direction. In the above structure, by setting the second hot pressing motor, the lower pressing plate is driven to move toward the upper pressing plate, and cooperates with the first hot pressing motor to increase the pressing force and further improve the efficiency of hot pressing of the electrode plate.

[0015] In some embodiments, the number of hot pressing mechanisms is multiple, and the pole piece hot pressing device further includes a connecting shaft, and the multiple hot pressing mechanisms are sequentially connected to the connecting shaft at intervals along the first direction. In the above structure, by adding the number of hot pressing mechanisms, the number of hot pressed electrode pole pieces is increased, and the hot pressing efficiency is improved.

[0016] In some embodiments, multiple hot pressing mechanisms are slidably connected to the connecting shaft, a first hot pressing motor is connected to an upper pressing plate of a hot pressing mechanism at the top of the multiple hot pressing mechanisms along the first direction, and a second hot pressing motor is connected to a lower pressing plate of a hot pressing mechanism at the end of the multiple hot pressing mechanisms along the first direction. In the above structure, two hot pressing motors are used to simultaneously hot press the electrode sheets in the multiple hot pressing mechanisms, thereby improving the efficiency of hot pressing.

[0017] In a second aspect, the present application provides a battery manufacturing device, which includes the pole piece hot pressing device in the above-mentioned embodiment.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a pole piece hot pressing device according to some embodiments of the present application;

[0021] Figure 2 It is a schematic structural diagram of a pole piece hot pressing device of other embodiments of the present application;

[0022] Figure 3 It is a structural schematic diagram of a pole piece hot pressing device according to some other embodiments of the present application;

[0023] Figure 4 It is a schematic structural diagram of a pole piece hot pressing device of other embodiments of the present application;

[0024] Figure 5 A schematic diagram of the structure of a pole piece hot pressing device according to some other embodiments of the present application;

[0025] Figure 6 Schematic diagram of the structure of the pole piece hot pressing device of some other embodiments of the present application.

[0026] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0027] 1. Pole piece hot pressing device; X, first direction; Y, second direction; 101, hot pressing mechanism; 102, rotating mechanism; 103, upper pressing plate; 104, lower pressing plate; 105, lower rotating shaft; 106, lower rotating plate; 107, lower spring pad; 108, upper rotating shaft; 109, upper rotating plate; 110, upper spring pad; 111, driving motor; 112, first hot pressing motor; 113, second hot pressing motor; 114, connecting shaft. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0038] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0039] The term “plurality” used in this application refers to two or more (including two).

[0040] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0041] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0042] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0043] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0044] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector. As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0045] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0046] In some embodiments, the electrode assembly is a laminated structure. As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0047] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0048] During the production process of electrode assemblies, in order to press the electrode sheets and diaphragms together, eliminate the wrinkles and internal air of the diaphragm, and maximize the contact area between them, a hot pressing device is usually used to hot-press the stacked electrode sheets to tightly combine the positive electrode sheets, negative electrode sheets and diaphragms together to prevent leakage and short circuit of the wall electrolyte inside the battery.

[0049] However, the electrode sheets undergo a leveling process during the coating of active materials, and the coating thickness on both sides of the current collector is different from that at the center. Usually, the thickness is thinner on both sides to form a thinning area, and the thickness of the middle main part is thicker. Usually, there are dozens of layers of electrode sheets stacked in the electrode assembly, and the accumulation of thickness defects in the thinning area causes the thickness difference to increase. The hot pressing plate of the hot pressing device is a flat plate. During the pressing process, the electrode sheets in the thinning area cannot be compacted, and collisions during assembly can easily cause the edge electrode sheets to fall off. Therefore, elastic gaskets are usually set on the hot pressing plate to compensate for the above-mentioned thickness differences during the hot pressing process and improve the compaction of the thinning area. However, the elastic gasket needs to be replaced after several uses, and the replacement process is cumbersome, which reduces the efficiency of the hot pressing process.

[0050] Based on the above reasons, the present application provides a pole piece hot pressing device, which performs hot pressing on the electrode pole piece by setting a hot pressing mechanism, thereby improving the compaction between the electrode pole pieces and improving the efficiency and stability of the battery cell operation. In the rotating mechanism, a lower spring pressure pad is provided, and the lower spring pressure pad can be deformed during the hot pressing process, so as to balance the pressure at various locations of the electrode pole piece, increase the pressure on the thinning area of ​​the electrode pole piece, and improve the connection strength of the pole piece in the thinning area. In addition, by providing a lower rotating plate to support the lower spring pressure pad, the lower rotating shaft drives the lower rotating plate to rotate, so that the lower spring pressure pad can be easily removed from between the upper pressing plate and the lower pressing plate, which is convenient for the replacement and assembly of the lower spring pressure pad, and improves the assembly efficiency of the lower spring pressure pad, thereby improving the efficiency of hot pressing of the electrode pole piece.

[0051] Please refer to Figure 1 to Figure 2 , Figure 1 This is a schematic diagram of the structure of a pole piece hot pressing device according to some embodiments of the present application. Figure 2 Schematic diagram of the structure of the pole piece hot pressing device of other embodiments of the present application.

[0052] As shown in the figure, the pole piece hot pressing device 1 provided in the embodiment of the present application includes a hot pressing mechanism 101 and a rotating mechanism 102. The hot pressing mechanism 101 includes an upper pressing plate 103 and a lower pressing plate 104 arranged opposite to each other, and the upper pressing plate 103 and the lower pressing plate 104 can move toward each other along the first direction X. The rotating mechanism 102 includes a lower rotating shaft 105, a lower rotating plate 106 and a lower spring pad 107. The lower rotating plate 106 is arranged between the upper pressing plate 103 and the lower pressing plate 104. The lower spring pad 107 is arranged on the side of the lower rotating plate 106 facing the upper pressing plate 103, and the lower spring pad 107 can be extended and retracted along the first direction X. The lower rotating shaft 105 is connected to one side of the lower rotating plate 106 along the second direction Y. The rotation of the lower rotating shaft 105 drives the lower rotating plate 106 to rotate around the lower rotating shaft 105. The second direction Y is perpendicular to the first direction X to move the lower spring pad 107 out of the space between the upper pressing plate 103 and the lower pressing plate 104.

[0053] The upper pressing plate 103 is a part of the hot pressing mechanism 101, and is used to provide pressure to the stacked electrode plates during the hot pressing process. Optionally, the upper pressing plate 103 is connected to a heat source to provide the required temperature during the hot pressing process to improve the effect of the hot pressing. The upper pressing plate 103 is arranged above the lower pressing plate 104, and the two are opposite to each other. The upper pressing plate 103 can move downward along a first direction X and move toward the lower pressing plate 104 to clamp and compress the electrode plates between the two. Exemplarily, the first direction X can be a vertical direction perpendicular to the horizontal direction.

[0054] The lower pressing plate 104 cooperates with the upper pressing plate 103 to apply pressure to the pole piece. Exemplarily, the lower pressing plate 104 is also connected to a heat source to provide the required temperature. Or it only serves to support and transmit pressure. The lower pressing plate 104 is located below the upper pressing plate 103. Optionally, the lower pressing plate 104 can move upward along the first direction X and move toward the upper pressing plate 103 to compact the pole piece.

[0055] The lower rotating shaft 105 is used to drive the lower rotating plate 106 to rotate around it, so as to realize the removal and insertion of the lower spring pad 107. The lower rotating shaft 105 is usually made of a strong and durable material and will not break or deform during the rotation process. The lower rotating shaft 105 is connected to one side of the lower rotating plate 106 along the second direction Y, and realizes rotation through a bearing or a similar device. Exemplarily, the second direction Y is parallel to the horizontal direction.

[0056] The lower rotating plate 106 is mounted on the lower rotating shaft 105, and is used to carry the lower spring pad 107, and drive it to move out of the hot pressing mechanism 101 when needed. The lower rotating plate 106 is generally a flat plate structure with a flat surface to ensure that the lower spring pad 107 can be stably mounted thereon. As the lower rotating shaft 105 rotates, the lower rotating plate 106 rotates around the lower rotating shaft 105, thereby driving the lower spring pad 107 to move out of or into the hot pressing mechanism 101.

[0057] The lower spring pad 107 clamps the pole piece together with the upper pressing plate 103 during the hot pressing process to ensure that the pole piece remains stable during the hot pressing process. The lower spring pad 107 is usually made of an elastic material and has a certain degree of compressibility and resilience to adapt to pole pieces of different thicknesses. The lower spring pad 107 can be extended and retracted along the first direction X so that the lower spring pad 107 can be moved out of or into the hot pressing mechanism 101 when needed. When the lower rotating plate 106 rotates, the lower spring pad 107 will move accordingly, thereby moving out of or into the space between the upper pressing plate 103 and the lower pressing plate 104.

[0058] In the technical solution of the embodiment of the present application, a hot pressing mechanism 101 is provided to perform hot pressing on the electrode plates, thereby improving the compaction between the electrode plates and improving the efficiency and stability of the battery cell operation. In the rotating mechanism 102, a lower spring pad 107 is provided, and the lower spring pad 107 can be deformed during the hot pressing process to balance the pressure at various locations of the electrode plates, thereby increasing the pressure on the thinning area of ​​the electrode plates and increasing the connection strength of the thinning area plates. In addition, by providing a lower rotating plate 106 to support the lower spring pad 107, the lower rotating shaft 105 drives the lower rotating plate 106 to rotate, so that the lower spring pad 107 can be easily removed from between the upper pressing plate 103 and the lower pressing plate 104, thereby facilitating the replacement and assembly of the lower spring pad 107, thereby improving the assembly efficiency of the lower spring pad 107 and thus improving the efficiency of hot pressing of the electrode plates.

[0059] like Figure 3 as well as Figure 4 As shown, in some embodiments of the present application, the rotating mechanism 102 also includes an upper rotating shaft 108, an upper rotating plate 109 and an upper spring pressure pad 110. The upper rotating plate 109 is arranged between the upper pressure plate 103 and the lower rotating plate 106. The upper spring pressure pad 110 is arranged on the side of the upper rotating plate 109 facing the lower rotating plate 106. The rotation of the upper rotating shaft 108 drives the upper rotating plate 109 to rotate around the second direction Y to move the upper spring pressure pad 110 out of the space between the upper pressure plate 103 and the lower pressure plate 104.

[0060] The upper rotating shaft 108 serves as the rotation center of the upper rotating plate 109. The upper rotating plate 109 and the upper spring pad 110 can be driven to rotate around the second direction Y through its rotation. The upper rotating shaft 108 is also made of a strong and durable material to ensure that it will not break or deform during the rotation process. The upper rotating shaft 108 is connected to one side of the upper rotating plate 109 along the second direction Y, and a bearing and other devices are used to achieve stable rotation. Exemplarily, the upper rotating shaft 108 is coaxially arranged with the lower rotating shaft 105.

[0061] The upper rotating plate 109 is mounted on the upper rotating shaft 108, located between the upper pressing plate 103 and the lower rotating plate 106, and is used to carry the upper spring pad 110 and allow it to be moved out of the hot pressing mechanism 101 when needed. The upper rotating plate 109 also adopts a flat plate structure with a flat surface to ensure that the upper spring pad 110 can be stably mounted thereon. As the upper rotating shaft 108 rotates, the upper rotating plate 109 rotates around the upper rotating shaft 108, thereby driving the upper spring pad 110 to move out of or into the hot pressing mechanism 101.

[0062] The upper spring pad 110 corresponds to the lower spring pad 107, and together they clamp the pole piece during the hot pressing process to ensure the stability and uniformity of the pole piece during the hot pressing process. The upper spring pad 110 is also made of elastic material, and has a certain degree of compressibility and resilience to adapt to pole pieces of different thicknesses. The movement of the upper spring pad 110 is achieved by the rotation of the upper rotating plate 109. When the upper rotating plate 109 rotates, the upper spring pad 110 will move accordingly, thereby moving out of or into the space between the upper pressing plate 103 and the lower pressing plate 104.

[0063] In the above structure, by providing the upper rotating shaft 108, the upper rotating plate 109 and the upper spring pressure pad 110, synchronous compaction of the upper and lower sides can be achieved during the hot pressing process, thereby further improving the compaction strength of the electrode pole piece thinning area. The improvement in compaction strength helps to improve the contact performance between the pole piece and the current collector, reduce the internal resistance, and thus improve the efficiency and operating stability of the battery cell. The upper spring pressure pad 110 and the lower spring pressure pad 107 can both be quickly moved out and in through the rotating mechanism 102, which facilitates the replacement and maintenance of the pole piece and improves the flexibility of the equipment. Since the pole piece can be quickly replaced and the hot pressing parameters can be adjusted, the production cycle can be shortened and the production efficiency can be improved.

[0064] In some embodiments of the present application, the upper spring pad 110 includes: any one of a silicone pad, an expansion pad and a polyimide pad, and the lower spring pad 107 includes: any one of a silicone pad, an expansion pad and a polyimide pad.

[0065] The silicone pad has good elasticity, high temperature resistance and chemical corrosion resistance. When heated and pressed, the silicone pad can deform appropriately, so as to adaptively fill the thinning area of ​​the electrode plate. By deforming and filling the thinning area, the silicone pad can compensate for the pressure in the thinning area, ensuring that the entire electrode plate is subjected to uniform pressure during the hot pressing process, thereby improving the compaction effect.

[0066] The expansion pad expands when heated, increasing its volume and thickness. This property enables the expansion pad to better adapt to the shape and thickness changes of the electrode plate during the hot pressing process. The expansion property of the expansion pad ensures that even if there are thinned areas in the electrode plate during the hot pressing process, these areas can be filled by expansion, thereby providing uniform pressure distribution and improving the compaction effect.

[0067] The polyimide rubber pad has high strength, high modulus and good heat resistance. During the hot pressing process, it can maintain a stable shape and size, while having a certain elastic deformation ability. The strength and heat resistance of the polyimide rubber pad enable it to maintain stable performance under high temperature and high pressure environments. At the same time, its elastic deformation ability allows it to adaptively fill the thinning area during the hot pressing process, ensuring that the electrode plate is subjected to uniform pressure.

[0068] The above-mentioned rubber pad materials can adaptively fill into the thinning area of ​​the electrode pole piece through deformation, thereby compensating for the pressure in the thinning area. This adaptive filling capability ensures that the entire electrode pole piece is subjected to uniform pressure during the hot pressing process, avoiding poor compaction effect caused by uneven pressure. Through evenly distributed pressure, the above-mentioned rubber pad material can improve the compaction effect of the electrode pole piece, thereby improving the performance and stability of the battery. Since the above-mentioned rubber pad material has good high temperature and high pressure resistance, it can be hot pressed at higher temperatures and pressures, thereby shortening the production cycle and improving production efficiency. In some embodiments of the present application, the thickness H1 of the upper spring pressure pad 110 is: 0.2mm≤H1≤5mm, and the thickness H2 of the lower spring pressure pad 107 is: 0.2mm≤H2≤5mm.

[0069] During the battery manufacturing process, the compaction of the electrode sheet is crucial to the performance and stability of the battery. To achieve this goal, the thickness of the upper spring pad 110 and the lower spring pad 107 are precisely controlled within a certain range to ensure that they can be deformed under the action of the hot pressing mechanism 101 and effectively squeeze the thinned area of ​​the electrode sheet, thereby improving the overall compaction of the electrode sheet.

[0070] The deformation of the spring-press pad can effectively squeeze the main part of the electrode plate and the thinning area at the same time, thereby improving the compaction of the entire electrode plate. At the same time, the squeezing effect can also reduce the risk of the thinning area plate falling off, and improve the reliability and stability of the battery. Through the deformation and squeezing effect of the spring-press pad, the overall compaction of the electrode plate has been significantly improved. The improvement in compaction helps to improve the conductivity and ion transfer efficiency inside the battery, thereby increasing the battery capacity and power output.

[0071] In some embodiments of the present application, the lower spring pad 107 is used to support the electrode sheet, and the lower spring pad 107 includes a main body and a first convex portion. The main body is provided on the surface of the lower rotating plate 106, and the main body is provided corresponding to the main part of the electrode sheet. The first convex portion, the main body protrudes toward the surface of the upper pressing plate 103, and the first convex portion is provided corresponding to the thinning area of ​​the electrode sheet.

[0072] The electrode plate includes a main body and a thinning area. The main body refers to the area on the electrode plate with a larger area, a flat surface, and a relatively uniform thickness. The thinning area refers to the area arranged around the main body, which is slightly thinner and has a relatively small area.

[0073] The main body is arranged on the surface of the lower rotating plate 106, and its shape and size correspond to the main body of the electrode sheet. The main function of the main body is to support the main body of the electrode sheet and provide uniform buffer pressure during the hot pressing process to ensure the flatness and density of the main surface of the electrode sheet.

[0074] The first protrusion is the part of the main body that protrudes toward the surface of the upper pressing plate 103, and its position and shape correspond to the thinning area of ​​the electrode plate. The main function of the first protrusion is to perform additional compression on the thinning area during the hot pressing process to compensate for the relative depression of the thinning area and improve the connection strength of the thinning area.

[0075] In the above structure, the arrangement of the main body can ensure that the main part of the electrode plate is uniformly supported and buffered during the hot pressing process. This uniform pressure distribution helps to eliminate the unevenness and pores on the main surface of the electrode plate, thereby improving its flatness and density. The improvement of flatness and density helps to improve the conductivity and ion transfer efficiency inside the battery, thereby improving the capacity and power output of the battery. The thinning area is an area in the electrode plate that is prone to breakage and falling off. By providing a first convex portion, the thinning area can be additionally squeezed during the hot pressing process, thereby increasing the density and connection strength of the thinning area. This enhanced connection strength helps to reduce the risk of breakage and falling off in the thinning area during the battery cycle, and improves the overall efficiency and operating stability of the battery cell. In some embodiments of the present application, the rotating mechanism 102 also includes a lifting device arranged between the lower rotating plate 106 and the lower pressing plate 104, and the lifting device is used to drive the lower rotating plate 106 to move away from the lower pressing plate 104 along the first direction X.

[0076] Exemplarily, the lifting mechanism is a lifting cylinder. When the lower spring pad 107 needs to be replaced, the lifting device can lift the lower rotating plate 106 to a certain height so that the lower rotating plate 106 can rotate freely. This design is not only convenient for the operator to operate, but also reduces the difficulty and complexity of replacing the lower spring pad 107, and improves the maintainability of the equipment. During the hot pressing process, the lifting device can adjust the distance between the lower rotating plate 106 and the lower pressure plate 104 as needed, thereby optimizing the hot pressing parameters. This flexible adjustment capability helps to ensure that the electrode pole piece is subjected to uniform and appropriate pressure during the hot pressing process, thereby improving the compaction effect. The setting of the lifting device can also improve the safety of the equipment to a certain extent. In an emergency, the lifting device can quickly lift the lower rotating plate 106 to avoid dangerous situations such as collision or jamming with the lower pressure plate 104.

[0077] By providing a lifting device, the lower rotating plate 106 can be quickly separated from the lower pressing plate 104. This rapid separation operation not only improves production efficiency, but also reduces friction and wear caused by long-term contact, thereby extending the service life of the equipment.

[0078] In some embodiments of the present application, the rotating mechanism 102 further includes a driving motor 111 connected to the lower rotating shaft 105 , and the driving motor 111 drives the lower rotating shaft 105 to rotate.

[0079] The drive motor 111 is connected to the lower shaft 105 and drives the lower shaft 105 to rotate by transmitting torque. The drive motor 111 can be a DC motor, an AC motor, a stepper motor or a servo motor, etc. The specific selection depends on the working requirements, control accuracy and cost of the rotating mechanism 102.

[0080] By arranging a driving motor 111 to drive the lower rotating shaft 105 to rotate, the rotation of the lower rotating plate 106 can be quickly realized. This efficient rotation capability not only improves production efficiency, but also shortens the time required to replace the lower spring pad 107, thereby reducing production costs.

[0081] In some optional embodiments, the drive motor 111 is usually equipped with a feedback device such as an encoder or a sensor, which can monitor and accurately control the rotation angle in real time. This precise control capability helps to ensure that the lower rotating plate 106 can be accurately positioned at a predetermined position when replacing the lower spring pad 107, thereby improving the reliability and stability of the device.

[0082] like Figure 5 As shown, in some embodiments of the present application, the pole piece hot pressing device 1 also includes a hot pressing drive mechanism, which includes a first hot pressing motor 112, and the first hot pressing motor 112 is connected to the upper pressing plate 103, and the first hot pressing motor 112 can drive the upper pressing plate 103 to move along the first direction X toward the lower pressing plate 104.

[0083] The hot pressing drive mechanism is one of the core components of the electrode hot pressing device 1, which generally includes a first hot pressing motor 112 and a transmission mechanism connected to the upper pressing plate 103. The first hot pressing motor 112 serves as a power source, and transmits torque to the upper pressing plate 103 through the transmission mechanism, thereby driving the upper pressing plate 103 to move toward the lower pressing plate 104 along the first direction X. By setting up the hot pressing drive mechanism, the downward pressing action of the upper pressing plate 103 can be quickly realized. This efficient downward pressing capability not only improves production efficiency, but also ensures that the electrode plate is subjected to timely and uniform pressure during the hot pressing process, thereby improving the compaction effect.

[0084] Optionally, the hot pressing drive mechanism is usually equipped with a pressure sensor and a control system, which can monitor and accurately control the pressure applied by the upper pressing plate 103 to the electrode sheet in real time. This precise pressure control capability helps to avoid overpressure or underpressure, thereby ensuring the compaction quality of the electrode sheet and battery performance.

[0085] In some embodiments of the present application, the hot pressing driving mechanism further includes a second hot pressing motor 113 , which is connected to the lower pressing plate 104 , and can drive the lower pressing plate 104 to move along the first direction X toward the upper pressing plate 103 .

[0086] The second hot pressing motor 113 is connected to the lower pressing plate 104, and the second hot pressing motor 113 can directly drive the lower pressing plate 104 to move along a specific first direction X, thereby realizing the directional movement of the upper pressing plate 103. By working in conjunction with the first hot pressing motor 112, the second hot pressing motor 113 enhances the pressing force. On the basis that the first hot pressing motor 112 may have provided a certain degree of pressure, the second hot pressing motor 113 can further apply additional pressure to ensure that the electrode plate is subjected to sufficient and uniform pressure distribution during the hot pressing process. This dual drive mechanism not only improves the efficiency of hot pressing, but also helps to improve the physical properties of the plate, such as density, conductivity and structural stability.

[0087] In addition, the introduction of the second hot pressing motor 113 also helps to achieve more accurate pressure control. By adjusting the output of the two motors, it is easier to fine-tune the pressure, thereby meeting the specific requirements of different electrode plate materials and specifications for pressure conditions.

[0088] In summary, by providing the second hot pressing motor 113 and connecting it to the lower pressing plate 104, the hot pressing drive mechanism increases the pressing strength while also improving the efficiency and quality of hot pressing of the electrode sheet. This design innovation provides a more reliable and efficient solution for manufacturing the electrode sheet.

[0089] like Figure 6As shown, in some embodiments of the present application, there are multiple hot pressing mechanisms 101, and the pole piece hot pressing device 1 further includes a connecting shaft 114, and the multiple hot pressing mechanisms 101 are sequentially connected to the connecting shaft 114 at intervals along the first direction X.

[0090] The number of the hot pressing mechanisms 101 is increased to multiple, and these hot pressing mechanisms 101 are sequentially connected at intervals along the first direction X through the connecting shaft 114. First, by increasing the number of hot pressing mechanisms 101, the electrode hot pressing device 1 can process more electrode sheets at the same time. In the same time, more finished products can be produced, thereby directly improving production efficiency, shortening production cycle, and reducing unit product cost.

[0091] Multiple hot pressing mechanisms 101 are arranged in sequence along the connecting shaft 114, and each hot pressing mechanism 101 can work independently without interfering with each other. This design not only improves the flexibility of the equipment, but also enables each hot pressing mechanism 101 to adjust its working state, such as pressure, temperature and time, according to actual needs. This personalized setting helps to meet the specific requirements of hot pressing conditions for different electrode sheet materials and specifications, thereby improving product quality and consistency.

[0092] In addition, the use of the connecting shaft 114 also simplifies the installation and maintenance process of the hot pressing mechanism 101. Through standardized connection interfaces and fasteners, the hot pressing mechanism 101 can be easily added or removed to adapt to changes in production requirements. At the same time, the connecting shaft 114 also provides stable support and guidance, ensuring the stability and accuracy of the hot pressing mechanism 101 during operation.

[0093] In the above structure, by increasing the number of hot pressing mechanisms 101, the number of hot pressing electrode sheets is increased, thereby improving the hot pressing efficiency.

[0094] In some embodiments of the present application, multiple hot pressing mechanisms 101 are slidably connected to the connecting shaft 114, the first hot pressing motor 112 is connected to the upper pressing plate 103 of the hot pressing mechanism 101 at the top along the first direction X among the multiple hot pressing mechanisms 101, and the second hot pressing motor 113 is connected to the lower pressing plate 104 of the hot pressing mechanism 101 at the end along the first direction X among the multiple hot pressing mechanisms 101.

[0095] Two hot pressing motors are used to simultaneously hot press the electrode plates in multiple hot pressing mechanisms 101, thereby improving the efficiency of hot pressing. The first hot pressing motor 112 applies pressure downward from the top, while the second hot pressing motor 113 applies pressure upward from the bottom. This two-way pressure application method not only enables the electrode plates to be subjected to uniform pressure distribution, but also speeds up the hot pressing process, so that more electrode plates can achieve the desired hot pressing effect in a shorter time. Secondly, the design of the sliding connection enables multiple hot pressing mechanisms 101 to transmit pressure through the connecting shaft 114. This configuration also improves the flexibility and scalability of the equipment. Since each hot pressing mechanism 101 is independent and slidable, the number and position of the hot pressing mechanisms 101 can be easily adjusted according to production needs. For example, when it is necessary to process larger electrode plates or increase production volume, additional hot pressing mechanisms 101 can be simply added and connected to the connecting shaft 114 without major modifications to the entire device.

[0096] In summary, two hot pressing motors are used to simultaneously hot press the electrode plates in a plurality of hot pressing mechanisms 101 , thereby improving the efficiency of hot pressing.

[0097] As shown in FIG6 , in some optional embodiments, the pole piece hot pressing device 1 includes a hot pressing mechanism 101 and a rotating mechanism 102, wherein the hot pressing mechanism 101 includes an upper pressing plate 103 and a lower pressing plate 104 that are arranged opposite to each other, and the upper pressing plate 103 and the lower pressing plate 104 can move toward each other along a first direction X. The rotating mechanism 102 includes a lower rotating shaft 105, a lower rotating plate 106, and a lower spring pad 107, wherein the lower rotating plate 106 is arranged between the upper pressing plate 103 and the lower pressing plate 104. The lower spring pad 107 is arranged on the side of the lower rotating plate 106 facing the upper pressing plate 103, and the lower spring pad 107 can be extended and retracted along the first direction X. The lower rotating shaft 105 is connected to one side of the lower rotating plate 106 along the second direction Y. The lower rotating shaft 105 rotates to drive the lower rotating plate 106 to rotate around the lower rotating shaft 105. The second direction Y is perpendicular to the first direction X, so as to move the lower spring pad 107 out of the space between the upper pressing plate 103 and the lower pressing plate 104. The rotating mechanism 102 also includes an upper rotating shaft 108, an upper rotating plate 109 and an upper spring pad 110. The upper rotating plate 109 is disposed between the upper pressing plate 103 and the lower rotating plate 106. The upper spring pad 110 is disposed on one side of the upper rotating plate 109 facing the lower rotating plate 106. The upper rotating shaft 108 rotates to drive the upper rotating plate 109 to rotate around the second direction Y, so as to move the upper spring pad 110 out of the space between the upper pressing plate 103 and the lower pressing plate 104. The rotating mechanism 102 also includes a driving motor 111 connected to the lower rotating shaft 105. The driving motor 111 drives the lower rotating shaft 105 to rotate. The pole piece hot pressing device 1 also includes a hot pressing drive mechanism, which includes a first hot pressing motor 112, which is connected to the upper pressing plate 103, and the first hot pressing motor 112 can drive the upper pressing plate 103 to move toward the lower pressing plate 104 along the first direction X. The hot pressing drive mechanism also includes a second hot pressing motor 113, which is connected to the lower pressing plate 104, and the second hot pressing motor 113 can drive the lower pressing plate 104 to move toward the upper pressing plate 103 along the first direction X. There are multiple hot pressing mechanisms 101, and the pole piece hot pressing device 1 also includes a connecting shaft 114, and multiple hot pressing mechanisms 101 are sequentially connected to the connecting shaft 114 at intervals along the first direction X. Multiple hot pressing mechanisms 101 are slidably connected to the connecting shaft 114, the first hot pressing motor 112 is connected to the upper pressing plate 103 of the hot pressing mechanism 101 at the top along the first direction X among the multiple hot pressing mechanisms 101, and the second hot pressing motor 113 is connected to the lower pressing plate 104 of the hot pressing mechanism 101 at the end along the first direction X among the multiple hot pressing mechanisms 101.

[0098] The embodiment of the present application also provides a battery manufacturing device, which includes the pole piece hot pressing device 1 in the above embodiment. By setting up a hot pressing mechanism 101 to hot press the electrode pole piece, the compaction between the electrode pole pieces is improved, and the efficiency and stability of the battery cell operation are improved. In the rotating mechanism 102, a lower spring pad 107 is set, and the lower spring pad 107 can be deformed during the hot pressing process, and the pressure at various parts of the electrode pole piece is balanced, thereby increasing the pressure on the thinning area of ​​the electrode pole piece and increasing the connection strength of the pole piece in the thinning area. In addition, by setting up a lower rotating plate 106 to support the lower spring pad 107, the lower rotating shaft 105 drives the lower rotating plate 106 to rotate, which can facilitate the removal of the lower spring pad 107 from between the upper pressing plate 103 and the lower pressing plate 104, facilitate the replacement and assembly of the lower spring pad 107, and improve the assembly efficiency of the lower spring pad 107, thereby improving the efficiency of hot pressing of the electrode pole piece.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece hot pressing device, characterized in that: include: The hot pressing mechanism comprises an upper pressing plate and a lower pressing plate which are arranged opposite to each other, and the upper pressing plate and the lower pressing plate can move toward each other along a first direction; The rotating mechanism includes a lower rotating shaft, a lower rotating plate and a lower spring pad, the lower rotating plate is arranged between the upper pressure plate and the lower pressure plate, the lower spring pad is arranged on the side of the lower rotating plate facing the upper pressure plate, the lower spring pad can be extended and retracted along the first direction, the lower rotating shaft is connected to the side of the lower rotating plate along the second direction, the rotation of the lower rotating shaft drives the lower rotating plate to rotate around the lower rotating shaft, the second direction is perpendicular to the first direction, so as to move the lower spring pad out of the space between the upper pressure plate and the lower pressure plate.

2. The pole piece hot pressing device according to claim 1, characterized in that: The rotating mechanism also includes an upper rotating shaft, an upper rotating plate and an upper spring pressure pad. The upper rotating plate is arranged between the upper pressure plate and the lower rotating plate. The upper spring pressure pad is arranged on the side of the upper rotating plate facing the lower rotating plate. The rotation of the upper rotating shaft drives the upper rotating plate to rotate around a second direction to move the upper spring pressure pad out of the space between the upper pressure plate and the lower pressure plate.

3. The pole piece hot pressing device according to claim 2, characterized in that: The upper spring pad includes any one of a silicone pad, an expansion pad and a polyimide pad, and the lower spring pad includes any one of a silicone pad, an expansion pad and a polyimide pad.

4. The pole piece hot pressing device according to claim 3, characterized in that: The thickness H1 of the upper spring pressure pad is: 0.2mm≤H1≤5mm, and the thickness H2 of the lower spring pressure pad is: 0.2mm≤H2≤5mm.

5. The pole piece hot pressing device according to claim 4, characterized in that: The lower spring pad is used to support the electrode plate, and the lower spring pad includes: A main body portion, arranged on the surface of the lower rotating plate, and arranged corresponding to the main body portion of the electrode plate; The first protrusion protrudes along the main body toward the surface of the upper pressing plate, and the first protrusion is arranged corresponding to the thinning area of ​​the electrode plate.

6. The pole piece hot pressing device according to any one of claims 2 to 5, characterized in that: The rotating mechanism further includes a lifting device disposed between the lower rotating plate and the lower pressing plate, and the lifting device is used for driving the lower rotating plate to move away from the lower pressing plate along the first direction.

7. The pole piece hot pressing device according to claim 6, characterized in that: The rotating mechanism further comprises a driving motor connected to the lower rotating shaft, and the driving motor drives the lower rotating shaft to rotate.

8. The pole piece hot pressing device according to claim 7, characterized in that: The pole piece hot pressing device also includes a hot pressing drive mechanism, which includes a first hot pressing motor connected to the upper pressing plate. The first hot pressing motor can drive the upper pressing plate to move toward the lower pressing plate along the first direction.

9. The pole piece hot pressing device according to claim 8, characterized in that: The hot pressing driving mechanism further includes a second hot pressing motor, which is connected to the lower pressing plate and can drive the lower pressing plate to move toward the upper pressing plate along the first direction.

10. The pole piece hot pressing device according to claim 9, characterized in that: The number of the hot pressing mechanisms is multiple, and the pole piece hot pressing device further includes a connecting shaft, and the multiple hot pressing mechanisms are sequentially connected to the connecting shaft at intervals along the first direction.

11. The pole piece hot pressing device according to claim 10, characterized in that: The multiple hot pressing mechanisms are slidably connected to the connecting shaft, the first hot pressing motor is connected to the upper pressing plate of the hot pressing mechanism at the top along the first direction among the multiple hot pressing mechanisms, and the second hot pressing motor is connected to the lower pressing plate of the hot pressing mechanism at the end along the first direction among the multiple hot pressing mechanisms.

12. A battery manufacturing device, characterized in that: The battery manufacturing equipment includes a pole piece hot pressing device as described in any one of claims 1-11.

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