Electrode assembly shaping device and battery production equipment

Abstract

The utility model provides an electrode assembly shaping device and battery production equipment, and belongs to the technical field of batteries. The electrode assembly shaping device is used for shaping and pressing an electrode assembly, and the electrode assembly comprises two opposite bending parts and a flattening part located between the two bending parts. The electrode assembly shaping device comprises a supporting piece and a shaping piece. The supporting piece is provided with a supporting surface for supporting the electrode assembly; the shaping piece and the supporting piece are arranged in a spaced mode in the first direction, the shaping piece is constructed to be capable of conducting shaping pressing on the electrode assembly located on the supporting face in the first direction, and the shaping piece comprises a first shaping pressing face used for conducting shaping pressing on the flat part and a second shaping pressing face used for conducting shaping pressing on the bent part; wherein the distance between at least partial area of the second pressing surface and the supporting surface along the first direction is greater than the maximum distance between the first pressing surface and the supporting surface along the first direction. Therefore, the risk that the electrode assembly is damaged or fractured in the whole pressing process can be reduced, and the whole pressing quality is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrode assembly shaping device and battery production equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] As the core component of the battery, the electrode assembly is the main part for storing and releasing electrical energy. The electrode assembly needs to be pressed to improve its performance and reliability. During the pressing process, the pressure, temperature, speed and cleanliness of the electrode assembly need to be controlled, otherwise it is easy to be damaged, which will affect the molding quality of the electrode assembly, and may affect the charging and discharging efficiency and cycle life of the battery. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide an electrode assembly shaping device and a battery production equipment to improve the molding quality of the electrode assembly.

[0005] An embodiment of the first aspect of the present application provides an electrode assembly shaping device. The electrode assembly shaping device is used to press the electrode assembly, and the electrode assembly includes two opposite bending portions and a flat portion located between the two bending portions. The electrode assembly shaping device includes a support member and a shaping member; the support member has a supporting surface for supporting the electrode assembly; the shaping member and the support member are spaced apart along a first direction, and are configured to be able to press the electrode assembly located on the supporting surface along the first direction, and the shaping member includes a first pressing surface for pressing the flat portion, and a second pressing surface for pressing the bending portion; wherein the distance between at least a portion of the second pressing surface and the supporting surface along the first direction is greater than the maximum distance between the first pressing surface and the supporting surface along the first direction.

[0006] In the technical solution of the embodiment of the present application, by providing the first pressing surface and the second pressing surface with a difference in distance from the support surface, it is beneficial to improve the contact between the shaping member and the electrode assembly, and can make the deformation difference of different positions of the electrode assembly during the pressing process more coordinated, thereby reducing the generation of stress in the electrode assembly. In addition, this can also reduce the stress concentration phenomenon of the bent portion of the electrode assembly during the pressing process, thereby reducing the risk of damage or fracture of the electrode assembly during the pressing process, and improving the pressing quality.

[0007] In some embodiments, at least a portion of the surface of the second pressing surface is arranged parallel to the first pressing surface. By arranging at least a portion of the surface of the second pressing surface parallel to the first pressing surface, the stress of the bending portion can be dispersed during the pressing process of the second pressing surface on the bending portion, so that the stress distribution of the electrode assembly as a whole is more uniform, thereby reducing the risk of damage to the electrode assembly. In addition, the parallel surface of the second pressing surface can provide a flat support surface to achieve full contact between the bending portion and the second pressing surface in this area, thereby improving the pressing quality.

[0008] In some embodiments, the second pressing surface includes a flat surface and a transition surface; the flat surface is parallel to the first pressing surface; the transition surface is connected to the first pressing surface and the flat surface respectively; wherein the transition surface and the first pressing surface and / or the flat surface have a smooth transition at the connection. By setting a smooth transition at the connection between the transition surface and the first pressing surface and / or the flat surface, it is beneficial to balance stress transfer and reduce stress concentration of the electrode assembly during the pressing process, thereby reducing the risk of damage to the electrode assembly.

[0009] In some embodiments, the distance between the first pressing surface and the flat surface along the first direction is greater than or equal to 0.05 mm and less than or equal to 0.5 mm. The distance between the first pressing surface and the flat surface along the first direction is set within a reasonable range, which is conducive to reducing the situation of uneven local pressure and improving the consistency of compression deformation of the electrode assembly during the pressing process, thereby improving the pressing quality and pressing.

[0010] In some embodiments, the second pressing surface is an inclined surface or an arc surface intersecting with the first pressing surface; along a direction parallel to the support surface and pointing away from the intersection of the second pressing surface and the first pressing surface, the distance between the second pressing surface and the support surface along the first direction gradually increases. The second pressing surface is set as an inclined surface or an arc surface intersecting with the first pressing surface, which is conducive to the transmission and dispersion of pressure, thereby balancing stress transmission and reducing stress concentration of the electrode assembly during the pressing process, and reducing the risk of damage to the electrode assembly.

[0011] In some embodiments, the flattening portion and the bent portion are arranged in sequence along a second direction perpendicular to the first direction; the shaping member is configured such that the size of the first pressing surface along the second direction is smaller than the size of the flattening portion along the second direction. This facilitates the second pressing surface to press the bent portion, thereby reducing the risk of the bent portion breaking and improving the pressing reliability.

[0012] In some embodiments, the distance between the junction of the first pressing surface and the second pressing surface and the junction of the corresponding flat portion and the bent portion along the second direction is greater than or equal to 10 mm and less than or equal to 30 mm. This facilitates the first pressing surface to press the flat portion, and the second pressing surface to press the bent portion, thereby reducing the stress concentration of the electrode assembly during the pressing process and reducing the risk of damage or fracture of the electrode assembly.

[0013] In some embodiments, the shaping piece is provided with an air source interface, and an air hole located on the first pressing surface and connected to the air source interface. After the pressing is completed, a negative pressure may be formed between the electrode assembly and the shaping piece, making it difficult to separate the two. By providing air holes and ventilation on the first pressing surface, the two can be better separated to avoid adhesion; in addition, ventilation through the air holes can clean dust, particles and other impurities adhering to the shaping piece, thereby improving the cleanliness during the pressing process and helping to improve the pressing quality. In addition, hard particles can also be blown away from the first pressing surface to reduce the risk of particles scratching the shaping piece, thereby increasing the service life of the electrode assembly shaping device.

[0014] In some embodiments, the number of air holes is multiple and they are arranged in an array. Providing multiple air holes and arranging them in an array facilitates uniform ventilation and increases ventilation volume, reduces fluid resistance, and further helps to clean dust, particles and other impurities stuck on the shaping piece, thereby improving the cleanliness during the shaping process and improving the shaping quality.

[0015] In some embodiments, the diameter of the pores is greater than or equal to 0.3 mm and less than or equal to 1 mm. By setting the pore diameter within a reasonable range, it is helpful to improve the smoothness of gas outflow, further helping to clean dust, particles and other impurities stuck on the shaping piece, thereby improving the cleanliness during the shaping process and improving the shaping quality.

[0016] In some embodiments, the electrode assembly shaping device further includes a driving member and a mounting member; the driving member is used to drive the shaping member to move along a first direction; the mounting member is fixedly connected to the driving member, and the shaping member is detachably connected to the mounting member. By setting the shaping member to be detachably connected to the mounting member, it is convenient to disassemble the shaping member, and further convenient to clean the dust and particles of the shaping member, thereby improving the cleanliness during the shaping process. In addition, the detachable connection of the shaping member also helps to replace the shaping member to adapt to more specifications and models of electrode assemblies, thereby improving the shaping efficiency.

[0017] In some embodiments, the mounting member includes an opening portion, and a mounting groove connected to the opening portion and extending along a third direction perpendicular to the first direction; the shaping member is configured to be movably connected to the mounting groove through the opening portion along the third direction. This can improve the flexibility and adjustability of the shaping member, thereby facilitating the disassembly of the shaping member, further cleaning the dust and particles of the shaping member, thereby improving the cleanliness during the shaping process and improving the shaping quality.

[0018] In some embodiments, the mounting member further comprises at least one fixing hole and a locking member; at least one fixing hole extends along the first direction and communicates with the mounting groove; the locking member is disposed in the fixing hole, and the locking member is used to lock the shaping member located in the mounting groove to the mounting member. By providing the locking member, the shaping member can be locked to the mounting member, which is beneficial to increase the stability of the connection between the shaping member and the mounting member, thereby improving the accuracy during the shaping process and further improving the shaping quality.

[0019] An embodiment of the second aspect of the present application provides a battery production device, which includes the electrode assembly shaping device in the above embodiment.

[0020] 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

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0022] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0023] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0024] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0025] Figure 4 This is a schematic diagram of the structure of the electrode assembly of some embodiments of the present application;

[0026] Figure 5 This is one of the simplified schematic diagrams of the pressure-regulating process of some embodiments of the present application;

[0027] Figure 6 This is a second simplified schematic diagram of the pressure-regulating process of some embodiments of the present application;

[0028] Figure 7 This is one of the structural schematic diagrams of the electrode assembly shaping device in some embodiments of the present application;

[0029] Figure 8 This is a second structural schematic diagram of an electrode assembly shaping device according to some embodiments of the present application;

[0030] Fig. 9 This is one of the structural schematic diagrams of the shaping member in some embodiments of the present application;

[0031] Fig.10 This is the second structural schematic diagram of the shaping member of some embodiments of the present application;

[0032] Fig.11 for Fig.10 Schematic diagram of the cross section along AA;

[0033] Fig.12 for Fig.11 An enlarged view of part B;

[0034] Fig.13 This is a schematic diagram of the structure of the mounting parts of some embodiments of the present application;

[0035] Fig.14 This is a schematic diagram of the structure of a locking member according to some embodiments of the present application.

[0036] Description of reference numerals:

[0037] Vehicles 1000;

[0038] Battery 100, controller 200, motor 300, electrode assembly shaping device 400;

[0039] Box body 10, first part 11, second part 12;

[0040] Battery cell 20, end cap 21, electrode terminal 21a, housing 22, electrode assembly 23, tab 23a, positive electrode sheet 24, negative electrode sheet 25, separator 26, bending portion 27, flat portion 28;

[0041] A shaping member 30, a first shaping surface 31, a second shaping surface 32, a flat surface 321, a transition surface 322, an air source interface 33, and an air hole 34;

[0042] Mounting member 40, opening 41, mounting groove 42, fixing hole 43, locking member 44;

[0043] Support member 50, support surface 51;

[0044] The first direction is X, the second direction is Y, and the third direction is Z. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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).

[0051] 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.

[0052] 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.

[0053] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0054] The battery is mainly composed of an electrode assembly, an electrolyte, a casing and other auxiliary components, among which the electrode assembly determines the performance indicators of the battery. During the manufacturing process of the battery, it is necessary to go through raw material preparation, slurry preparation, coating process, pole piece processing, and assembly in sequence to form an electrode assembly. During the assembly process of the electrode assembly, the electrode assembly can be assembled by winding, that is, the cut positive and negative electrode sheets and the diaphragm are spirally wound together in a certain order. After the assembly is completed, the electrode assembly needs to be pressed to make the positive and negative electrode sheets and the diaphragm inside it fit more tightly, and then it is put into the shell or packaged.

[0055] During the process of pressing the assembled electrode assembly, if the pressure is not properly controlled, the electrode sheet or the diaphragm may be damaged, and poor pressing may increase the internal resistance of the battery, thereby reducing the charge and discharge efficiency of the battery. In some cases, the electrode assembly is formed by winding the positive electrode sheet, the negative electrode sheet, and the diaphragm disposed between the positive electrode sheet and the negative electrode sheet, thereby having a bent portion and a flat portion with a certain curvature. Therefore, during the pressing process, compared with the flat portion that can achieve uniform pressure transmission, the bent portion is more susceptible to damage and fracture due to stress concentration, thereby affecting the charge and discharge efficiency and cycle life of the electrode assembly.

[0056] In order to solve the above problems, the present application provides an electrode assembly shaping device and a battery production equipment. The electrode assembly shaping device is used to press the electrode assembly, and the electrode assembly includes two opposite bending parts and a flat part located between the two bending parts. The electrode assembly shaping device includes a support member and a shaping member; the support member has a supporting surface for supporting the electrode assembly; the shaping member and the support member are arranged at intervals along the first direction, and are constructed to be able to press the electrode assembly located on the supporting surface along the first direction, and the shaping member includes a first pressing surface for pressing the flat part, and a second pressing surface for pressing the bending part; wherein, the distance between at least a part of the second pressing surface and the supporting surface along the first direction is greater than the maximum distance between the first pressing surface and the supporting surface along the first direction. In this way, the risk of damage or breakage of the electrode assembly during the pressing process can be reduced, and the pressing quality can be improved.

[0057] The electrode assembly shaping device disclosed in the embodiment of the present application is used to shape and press the electrode assembly to manufacture a battery cell. The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery cell and battery disclosed in the present application can be used to form the electrical device.

[0058] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery provided for some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0064] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0065] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0066] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0067] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 22, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0068] The electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet 24 and a negative electrode sheet 25, and a separator 26 is usually provided between the positive electrode sheet 24 and the negative electrode sheet 25. The parts of the positive electrode sheet 24 and the negative electrode sheet 25 with active materials constitute the main body of the electrode assembly 23, and the parts of the positive electrode sheet 24 and the negative electrode sheet 25 without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminal to form a current loop.

[0069] like Figure 4-Figure 8 As shown, Figure 4 This is a schematic diagram of the structure of the electrode assembly of some embodiments of the present application; Figure 5 This is one of the simplified schematic diagrams of the pressure-regulating process of some embodiments of the present application; Figure 6 This is a second simplified schematic diagram of the pressure-regulating process of some embodiments of the present application; Figure 7 This is one of the structural schematic diagrams of the electrode assembly shaping device in some embodiments of the present application; Figure 8 This is the second structural schematic diagram of the electrode assembly shaping device of some embodiments of the present application.

[0070] The present application embodiment provides an electrode assembly shaping device 400 for shaping the electrode assembly 23, such as Figure 4-Figure 8 As shown, the electrode assembly 23 includes two opposite bending portions 27 and a flattened portion 28 located between the two bending portions 27. The electrode assembly shaping device 400 includes a support member 50 and a shaping member 30; the support member 50 has a supporting surface 51 for supporting the electrode assembly 23; the shaping member 30 and the support member 50 are arranged at intervals along the first direction X, and are configured to be able to press the electrode assembly 23 located on the supporting surface 51 along the first direction X, and the shaping member 30 includes a first pressing surface 31 for pressing the flattened portion 28, and a second pressing surface 32 for pressing the bending portion 27; wherein the distance between at least a part of the second pressing surface 32 and the supporting surface 51 along the first direction X is greater than the maximum distance between the first pressing surface 31 and the supporting surface 51 along the first direction X.

[0071] The electrode assembly 23 is mainly formed by winding the positive electrode sheet 24, the negative electrode sheet 25, and the separator 26 disposed on the positive electrode sheet 24 and the negative electrode sheet 25. Specifically, the positive electrode sheet 24, the separator 26, and the negative electrode sheet 25 are usually stacked in sequence with the central axis as the center and then wound. During the winding process, the part close to the central axis will form a significant bend due to the small bending radius, thereby forming a bent portion 27, while the unbent part is a flat portion 28. Such a structural design is conducive to increasing the electrode area in a limited space and improving the energy density of the battery.

[0072] The support member 50 is an important component for realizing smooth pressing operation, and can provide stable support for the electrode assembly 23, wherein the surface of one side of the support member 50 close to the electrode assembly 23 is the support surface 51. The support member 50 can be a fixed support member, such as a fixed flat plate or block structure, or a floating support member, such as a support member provided with an elastic connector and capable of floating within a certain range to better meet the pressing requirements of the electrode assembly 23, or a transmission support member, which can realize transmission while supporting, such as a conveyor belt.

[0073] The shaping member 30 and the support member 50 are arranged at intervals along the first direction X, which can be understood as a certain space between the shaping member 30 and the support member 50. During the shaping process, the electrode assembly 23 is placed on the support member 50, wherein the shaping member 30 can move along the first direction X to achieve the shaping of the electrode assembly 23. The shaping member 30 includes a first shaping surface 31 and a second shaping surface 32, wherein during the shaping process, the first shaping surface 31 corresponds to the flat portion 28, and the second shaping surface 32 corresponds to the bending portion 27. It should be understood that the correspondence not only refers to the correspondence in position, but also refers to the correspondence in quantity. Specifically, the electrode assembly 23 includes a flat portion 28 and two bending portions 27 arranged on both sides of the flat portion 28, and accordingly, the shaping member 30 includes a first shaping surface 31 and two second shaping surfaces 32 arranged on both sides of the first shaping surface 31.

[0074] For parts with larger curvature, during the whole pressing process, the curvature of the bent part may change further under the action of external force, resulting in more obvious stress concentration. Figure 5As shown, the distance between at least part of the second pressing surface 32 and the supporting surface 51 along the first direction X is h1, and the maximum distance between the first pressing surface 31 and the supporting surface 51 along the first direction X is h2, wherein h1>h2, that is, along the first direction X, the distance between some area of ​​the second pressing surface 32 and the supporting surface 51 is greater than the distance between any area of ​​the first pressing surface 31 and the supporting surface 51. In this way, when the electrode assembly 23 is pressed, the flattened portion 28 will first contact the first pressing surface 31 and be compressed and deformed under the action of the first pressing surface 31, thereby causing the bent portion 27 to contact the second pressing surface 32 and be squeezed and deformed. Since the distance between the bent portion 27 and the second pressing surface 32 is greater than the distance between the flattened portion 28 and the first shaping surface 31, when the downward pressing stroke of the shaping member 30 is constant, the force order of the bent portion 27 is after the flattened portion 28, and the degree of compression deformation of the bent portion 27 is slightly lower than that of the flattened portion 28. This can significantly alleviate the stress concentration of the bent portion 27 during the pressing process.

[0075] Therefore, by providing the first pressing surface 31 and the second pressing surface 32 with a difference in distance from the support surface 51, it is beneficial to improve the contact between the shaping member 30 and the electrode assembly 23, and can make the deformation difference of different positions of the electrode assembly 23 during the pressing process more coordinated, thereby reducing the generation of stress in the electrode assembly 23. In addition, this can also reduce the stress concentration phenomenon of the bent portion 27 of the electrode assembly 23 during the pressing process, thereby reducing the risk of damage or fracture of the electrode assembly 23 during the pressing process, and improving the pressing quality.

[0076] According to some embodiments of the present application, Figure 5 As shown, at least a portion of the second pressing surface 32 is arranged parallel to the first pressing surface 31 .

[0077] The second pressing surface 32 may be a single plane or an arcuate surface, or a combination of multiple surfaces. In some embodiments, the first pressing surface 31 is a plane and the normal direction of the plane where it is located is parallel to the first direction X, and the normal direction of the plane where a part of the surface of the second pressing surface 32 is located is also parallel to the first direction X.

[0078] In some embodiments, the second pressing surface 32 may include one or more surfaces parallel to the first pressing surface 31 and form a stepped structure with the first pressing surface 31 .

[0079] By setting at least part of the surface of the second pressing surface 32 parallel to the first pressing surface 31, the stress of the bent portion 27 can be dispersed during the pressing process of the second pressing surface 32 on the bent portion 27, so that the stress distribution of the electrode assembly 23 as a whole is more uniform, thereby reducing the risk of damage to the electrode assembly 23. In addition, the parallel surface of the second pressing surface 32 can provide a flat supporting surface 51 to achieve full contact between the bent portion 27 and the second pressing surface 32 in this area, thereby improving the pressing quality.

[0080] like Fig. 9 As shown, Fig. 9 This is one of the structural schematic diagrams of the shaping member in some embodiments of the present application.

[0081] According to some embodiments of the present application, Fig. 9 As shown, the second pressing surface 32 includes a flat surface 321 and a transition surface 322; the flat surface 321 is parallel to the first pressing surface 31; the transition surface 322 connects the first pressing surface 31 and the flat surface 321 respectively; wherein the connection between the transition surface 322 and the first pressing surface 31 and / or the flat surface 321 is smoothly transitioned.

[0082] In some embodiments, the first pressing surface 31 is a plane and the normal direction of the plane is parallel to the first direction X, and the flat surface 321 is parallel to the first pressing surface 31 , that is, the normal direction of the plane of the flat surface 321 is parallel to the first direction X. The second pressing surface 32 is arranged on both sides of the first pressing surface 31 , and correspondingly, the transition surface 322 is arranged on both sides of the first pressing surface 31 and connected to the two flat surfaces 321 .

[0083] The transition surface 322 smoothly transitions with the first pressing surface 31 and / or the flat surface 321. It can be understood that the transition surface 322 smoothly transitions only with the first pressing surface 31, or the transition surface 322 smoothly transitions only with the flat surface 321, or the transition surface 322 smoothly transitions with the first pressing surface 31 and the flat surface 321. The smooth transition can be a rounded corner setting, a chamfer setting, or a gradient curve setting to achieve the transition.

[0084] By setting a smooth transition at the connection between the transition surface 322 and the first pressing surface 31 and / or the flat surface 321, it is beneficial to balance the stress transfer and reduce the stress concentration phenomenon of the electrode assembly 23 during the pressing process, thereby reducing the risk of damage to the electrode assembly 23.

[0085] like Figure 10-12 As shown, Fig.10 This is the second structural diagram of the shaping member of some embodiments of the present application. Fig.11 for Fig.10 Schematic diagram of the cross section along AA, Fig.12 for Fig.11 Magnified view of part B.

[0086] According to some embodiments of the present application, Figure 5 as well as Figure 8-Figure 10 As shown, the distance between the first pressing surface 31 and the flat surface 321 along the first direction X is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0087] like Figure 5 As shown, the distance between the first pressing surface 31 and the flat surface 321 along the first direction X is c, wherein the value of c can be specifically set to 0.05 mm, 0.15 mm, 0.25 mm, 0.35 mm, 0.45 mm and 0.5 mm.

[0088] In some embodiments, the second pressing surface 32 may include a plurality of flat surfaces 321, each of which has a different distance from the first pressing surface 31 along the first direction X. In this way, the contact area between the electrode assembly 23 and the shaping member 30 can be adjusted as the pressing distance changes, taking into account both shaping quality and stress concentration relief.

[0089] The distance between the first pressing surface 31 and the flat surface 321 along the first direction X is set within a reasonable range, which is beneficial to reducing the situation of local pressure unevenness and improving the consistency of compression deformation of the electrode assembly 23 during the pressing process, thereby improving the pressing quality and pressing.

[0090] According to some embodiments of the present application, the second pressing surface 32 is an inclined surface or an arc surface intersecting with the first pressing surface 31; along the first direction X parallel to the support surface 51 and pointing from the intersection of the second pressing surface 32 and the first pressing surface 31 away from the first pressing surface 31, the distance between the second pressing surface 32 and the support surface 51 gradually increases.

[0091] The second pressing surface 32 is an inclined surface or an arcuate surface intersecting with the first pressing surface 31. Specifically, the inclined surface refers to a plane that forms a certain angle with the horizontal plane (the plane perpendicular to the first direction X), and the arcuate surface refers to the plane whose cross-section is an arc formed by the intersection of the second pressing surface 32 in the first direction X and the second direction Y. It can be understood that the arc can be a concave arc surface or a convex arc surface.

[0092] like Figure 6 As shown, the direction of the intersection of the second pressure-smoothing surface 32 and the first pressure-smoothing surface 31 pointing away from the first pressure-smoothing surface 31 is direction S, and the distance between the second pressure-smoothing surface 32 and the support surface 51 along the first direction X is h1, wherein the value of h1 gradually increases along the direction parallel to the support surface 51 and along the direction S. In some embodiments, the distance between the second pressure-smoothing surface 32 and the support surface 51 along the first direction X gradually increases, which can also be understood as the second pressure-smoothing surface 32 being deflected toward the first pressure-smoothing surface 31 relative to the parallel plane of the support surface 51.

[0093] The second pressing surface 32 is configured as an inclined surface or an arc surface intersecting with the first pressing surface 31, which is beneficial to the transmission and dispersion of pressure, thereby balancing the stress transmission and reducing the stress concentration phenomenon of the electrode assembly 23 during the pressing process, and reducing the risk of damage to the electrode assembly 23.

[0094] According to some embodiments of the present application, Figure 4 and Figure 5 As shown, the flattening portion 28 and the bending portion 27 are arranged in sequence along a second direction Y perpendicular to the first direction X; the shaping member 30 is constructed so that the size of the first pressing surface 31 along the second direction Y is smaller than the size of the flattening portion 28 along the second direction Y.

[0095] The flat portion 28 and the bent portion 27 are arranged in sequence along the second direction Y. Specifically, along the second direction Y, the bent portion 27, the flat portion 28 and the bent portion 27 are arranged in sequence. Figure 5 As shown, the dimension of the first flattened surface 31 along the second direction Y is b1, and the dimension of the flattened portion 28 along the second direction Y is b2, wherein b1<b2.

[0096] In some embodiments, along the second direction Y, the contour edge of the orthographic projection of the first pressing surface 31 on the upper surface of the flattened portion 28 along the second direction Y completely falls within the range of the upper surface of the flattened portion 28 .

[0097] This helps the second pressing surface 32 to press the bending portion 27, thereby reducing the risk of the bending portion 27 breaking and improving the pressing reliability.

[0098] According to some embodiments of the present application, Figure 5 As shown, the distance between the junction of the first pressing surface 31 and the second pressing surface 32 and the junction of the corresponding flat portion 28 and the bending portion 27 along the second direction Y is greater than or equal to 10 mm and less than or equal to 30 mm.

[0099] The junction of the first pressing surface 31 and the second pressing surface 32 may refer to the portion where the first pressing surface 31 and the second pressing surface 32 are connected or intersected with each other, and the junction of the flat portion 28 and the bent portion 27 may refer to the region where the two different portions are connected or transitioned with each other. Figure 5 As shown, the distance between the junction of the first pressing surface 31 and the second pressing surface 32 and the junction of the corresponding flat portion 28 and the bending portion 27 along the second direction Y is d, wherein 10 mm≤d≤30 mm.

[0100] In some embodiments, the value range of d satisfies 20 mm≤d≤30 mm, wherein the value of d can be 20 mm, 23 mm, 25 mm, 27 mm or 30 mm.

[0101] This facilitates the first pressing surface 31 to press the flat portion 28 and the second pressing surface 32 to press the bent portion 27, thereby reducing stress concentration in the electrode assembly 23 during the pressing process and reducing the risk of damage or breakage of the electrode assembly 23.

[0102] According to some embodiments of the present application, Figure 7 and Figure 8 As shown, the shaping member 30 is provided with an air source interface 33 , and an air hole 34 located on the first pressure shaping surface 31 and connected to the air source interface 33 .

[0103] The gas source interface 33 is a component used to connect the gas source and the gas-using device or system, which can transport the gas in the external gas source device to the channel in the device or system that needs to use the gas. The gas source interface 33 can be a threaded interface, a flange interface or a ferrule interface. The first pressure-regulating surface 31 is provided with an air hole 34, wherein the gas in the external gas source device can be blown out from the air hole 34 via the gas source interface 33.

[0104] After the pressing is completed, negative pressure may be formed between the electrode assembly 23 and the shaping piece 30, making it difficult to separate the two. By setting air holes 34 on the first pressing surface 31 and ventilating them, the two can be better separated to avoid adhesion. In addition, ventilation through the air holes 34 can clean dust, particles and other impurities stuck to the shaping piece 30, thereby improving the cleanliness during the pressing process and helping to improve the pressing quality. In addition, hard particles can also be blown away from the first pressing surface 31 to reduce the risk of scratches on the shaping piece 30 by particles, thereby increasing the service life of the electrode assembly shaping device 400.

[0105] According to some embodiments of the present application, Fig. 9 and Fig.10 As shown, there are a plurality of air holes 34 , which are arranged at intervals in an array.

[0106] The number of the air holes 34 may be 50-150, specifically 50, 80, 100, 120 or 150, wherein the plurality of air holes 34 are arranged in an array, and a certain interval is maintained between each air hole 34 .

[0107] By providing multiple air holes 34 and arranging them in an array, it is beneficial to uniform ventilation and increase the ventilation volume, and reduce fluid resistance, which further helps to clean dust, particles and other impurities stuck to the shaping piece 30, thereby improving the cleanliness during the pressing process and improving the pressing quality.

[0108] According to some embodiments of the present application, Fig. 9 and Fig.10 As shown, the diameter of the air hole 34 is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0109] The diameter of the air hole 34 may specifically be 0.3 mm, 0.5 mm, 0.7 mm or 1 mm.

[0110] By setting the diameter of the air hole 34 within a reasonable range, it is helpful to improve the smoothness of gas outflow, and further help to clean the dust, particles and other impurities stuck on the shaping piece 30, thereby improving the cleanliness during the pressing process and improving the pressing quality.

[0111] like Fig.13 As shown, Fig.13 This is a schematic diagram of the structure of the mounting parts of some embodiments of the present application.

[0112] According to some embodiments of the present application, Fig.13 As shown, the electrode assembly shaping device 400 also includes a driving member and a mounting member 40 ; the driving member is used to drive the shaping member 30 to move along the first direction X; the mounting member 40 is fixedly connected to the driving member, and the shaping member 30 is detachably connected to the mounting member 40 .

[0113] The driving member is a device that can control the shaping member 30 along the first direction X, which can transmit power to the shaping member 30, so that the shaping member 30 moves in a predetermined manner. In some cases, the driving member can be a cylinder, a hydraulic cylinder or a motor. The mounting member 40 can be a plate-like structure, which can be fixedly connected to the mounting member 40 by welding or bolts. The shaping member 30 is detachably connected to the mounting member 40, which can be understood as that the shaping member 30 and the mounting member 40 can be reliably connected together in a specific working scenario, and when no connection is required, the shaping member 30 and the mounting member 40 can be easily separated. In some embodiments, the connection method between the shaping member 30 and the mounting member 40 can be specifically a pin connection, a snap connection, a mortise and tenon connection or a magnetic connection.

[0114] By setting the shaping member 30 to be detachably connected to the mounting member 40, it is convenient to disassemble the shaping member 30, and further convenient to clean the dust and particles on the shaping member 30, thereby improving the cleanliness during the shaping process. In addition, the detachable connection of the shaping member 30 also helps to replace the shaping member 30 to adapt to electrode assemblies 23 of more specifications and models, thereby improving the shaping efficiency.

[0115] According to some embodiments of the present application, Fig.13 As shown, the mounting member 40 includes an opening portion 41 and a mounting groove 42 connected to the opening portion 41 and extending along a third direction Z perpendicular to the first direction X; the shaping member 30 is constructed to be able to be movably connected to the mounting groove 42 along the third direction Z through the opening portion 41.

[0116] The mounting member 40 includes an opening 41. It can be understood that one side surface of the mounting member 40 has an open area of ​​a certain shape and size, and its main purpose is to provide a channel so as to achieve connection and cooperation with the shaping member 30. The mounting groove 42 is a groove structure, which is spatially interpenetrating with the opening 41. In some embodiments, along the third direction Z, the connection between the shaping member 30 and the mounting groove 42 is not completely fixed, and a certain degree of relative linear movement between the shaping member 30 and the mounting groove 42 is allowed.

[0117] This can improve the flexibility and adjustability of the shaping member 30, thereby facilitating the disassembly of the shaping member 30 and further cleaning the dust and particles of the shaping member 30, thereby improving the cleanliness during the shaping process and improving the shaping quality.

[0118] Fig.14 This is a schematic diagram of the structure of a locking member according to some embodiments of the present application.

[0119] According to some embodiments of the present application, Fig.13 and Fig.14 As shown, the mounting member 40 also includes at least one fixing hole 43 and a locking member 44; at least one fixing hole 43 extends along the first direction X and is connected to the mounting groove 42; the locking member 44 is arranged in the fixing hole 43, and the locking member 44 is used to lock the shaping member 30 located in the mounting groove 42 to the mounting member 40.

[0120] The number of the fixing holes 43 can be multiple and symmetrically arranged along the mounting member 40. The fixing holes 43 extend along the first direction X and communicate with the mounting groove 42. It can be understood that the fixing holes 43 are arranged through the mounting groove 42. In some embodiments, the fixing holes 43 can be round holes or square holes. The locking member 44 is arranged in the fixing hole 43. Specifically, the locking member 44 and the fixing hole 43 can be detachably connected or non-detachably connected. The locking member 44 can realize the locking and unlocking of the shaping member 30 and the mounting member 40. In some embodiments, the locking member 44 is a pin structure.

[0121] By setting the locking member 44, the shaping member 30 can be locked to the mounting member 40, which is beneficial to increase the stability of the connection between the shaping member 30 and the mounting member 40, thereby improving the accuracy during the shaping process and further improving the shaping quality.

[0122] An embodiment of the present application provides a battery production device, which includes an electrode assembly shaping device 400 as described in the aforementioned embodiment.

[0123] The battery production equipment is a device for producing batteries, which includes not only the electrode assembly shaping device 400 in the embodiment of the present application, but also an electrode preparation device, a battery assembly device, a testing device, and a battery packaging device, etc. The beneficial effects of a battery production equipment provided by the embodiment of the present application have been described above and will not be repeated here.

[0124] like Figure 4-Figure 14 As shown, the present application provides an electrode assembly shaping device 400, which is used to shape and press the electrode assembly 23. The electrode assembly 23 includes two opposite bending portions 27 and a flat portion 28 located between the two bending portions 27. The electrode assembly shaping device 400 includes a support member 50, a shaping member 30, a driving member and a mounting member 40.

[0125] The support member 50 has a support surface 51 that supports the electrode assembly 23; the shaping member 30 and the support member 50 are spaced apart along the first direction X, and are constructed to be able to press the electrode assembly 23 located on the support surface 51 along the first direction X, and the shaping member 30 includes a first pressing surface 31 for pressing the flat portion 28, and a second pressing surface 32 for pressing the bent portion 27; wherein the distance between at least a portion of the second pressing surface 32 and the support surface 51 along the first direction X is greater than the maximum distance between the first pressing surface 31 and the support surface 51 along the first direction X.

[0126] Specifically, at least part of the surface of the second pressing surface 32 is arranged parallel to the first pressing surface 31. The second pressing surface 32 includes a flat surface 321 and a transition surface 322; the flat surface 321 is parallel to the first pressing surface 31; and the transition surface 322 is connected to the first pressing surface 31 and the flat surface 321 respectively; wherein the connection between the transition surface 322 and the first pressing surface 31 and / or the flat surface 321 is smoothly transitioned. In addition, the distance between the first pressing surface 31 and the flat surface 321 along the first direction X is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0127] The flattened portion 28 and the bent portion 27 of the electrode assembly 23 are arranged in sequence along a second direction Y perpendicular to the first direction X; the shaping member 30 is configured such that the size of the first pressing surface 31 along the second direction Y is smaller than the size of the flattened portion 28 along the second direction Y. In addition, the distance between the junction of the first pressing surface 31 and the second pressing surface 32 and the junction of the corresponding flattened portion 28 and the bent portion 27 along the second direction Y is greater than or equal to 10 mm and less than or equal to 30 mm.

[0128] In addition, the shaping member 30 is provided with an air source interface 33, and an air hole 34 located on the first pressure shaping surface 31 and connected to the air source interface 33, wherein the number of the air holes 34 is multiple and arranged in an array at intervals, and the diameter of the air holes 34 is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0129] The driving member is used to drive the shaping member 30 to move along the first direction X, and the mounting member 40 is fixedly connected to the driving member, and the shaping member 30 is detachably connected to the mounting member 40. The mounting member 40 includes an opening 41, and a mounting groove 42 connected to the opening 41 and extending along a third direction Z perpendicular to the first direction X; the shaping member 30 is configured to be movably connected to the mounting groove 42 along the third direction Z through the opening 41. The mounting member 40 also includes at least one fixing hole 43 and a locking member 44; at least one fixing hole 43 extends along the first direction X and is connected to the mounting groove 42; the locking member 44 is arranged in the fixing hole 43, and the locking member 44 is used to lock the shaping member 30 located in the mounting groove 42 to the mounting member 40.

[0130] 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. An electrode assembly shaping device, characterized in that: Used to shape and press an electrode assembly, the electrode assembly comprising two opposite bending portions and a flat portion located between the two bending portions, the electrode assembly shaping device comprising: A support member having a support surface for supporting the electrode assembly; a shaping member, arranged at intervals from the support member along a first direction, and configured to be able to press the electrode assembly located on the support surface along the first direction, the shaping member comprising a first pressing surface for pressing the flat portion, and a second pressing surface for pressing the bent portion; Wherein, a distance between at least a partial area of ​​the second pressure-smoothing surface and the supporting surface along the first direction is greater than a maximum distance between the first pressure-smoothing surface and the supporting surface along the first direction.

2. The electrode assembly shaping device according to claim 1, characterized in that: At least a portion of the second pressing surface is arranged parallel to the first pressing surface.

3. The electrode assembly shaping device according to claim 2, characterized in that: The second pressure-regulating surface comprises A flat surface, parallel to the first flattening surface; and transition surfaces, respectively connecting the first pressing surface and the flat surface; Wherein, the connection between the transition surface and the first pressing surface and / or the flat surface is smoothly transitioned.

4. The electrode assembly shaping device according to claim 3, characterized in that: A distance between the first pressing surface and the flat surface along the first direction is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

5. The electrode assembly shaping device according to claim 1, characterized in that: The second pressure-smoothing surface is an inclined surface or a curved surface intersecting with the first pressure-smoothing surface; Along a direction parallel to the supporting surface and pointing from the intersection of the second pressure-smoothing surface and the first pressure-smoothing surface toward away from the first pressure-smoothing surface, the distance between the second pressure-smoothing surface and the supporting surface along the first direction gradually increases.

6. The electrode assembly shaping device according to any one of claims 1 to 5, characterized in that: The flattened portion and the bent portion are arranged in sequence along a second direction perpendicular to the first direction; The shaping member is configured such that a dimension of the first pressure-shaping surface along the second direction is smaller than a dimension of the flattened portion along the second direction.

7. The electrode assembly shaping device according to claim 6, characterized in that: A distance between a junction of the first pressing surface and the second pressing surface and a corresponding junction of the flat portion and the bent portion along the second direction is greater than or equal to 10 mm and less than or equal to 30 mm.

8. The electrode assembly shaping device according to any one of claims 1 to 5, characterized in that: The shaping member is provided with an air source interface and an air hole located on the first pressure shaping surface and connected with the air source interface.

9. The electrode assembly shaping device according to claim 8, characterized in that: The number of the air holes is multiple and they are arranged in an array at intervals.

10. The electrode assembly shaping device according to claim 8, characterized in that: The diameter of the pores is greater than or equal to 0.3 mm and less than or equal to 1 mm.

11. The electrode assembly shaping device according to any one of claims 1 to 5, characterized in that: Also includes: A driving member, used for driving the shaping member to move along the first direction; The mounting member is fixedly connected to the driving member, and the shaping member is detachably connected to the mounting member.

12. The electrode assembly shaping device according to claim 11, characterized in that: The mounting member includes an opening portion and a mounting groove connected to the opening portion and extending along a third direction perpendicular to the first direction; the shaping member is configured to be movably connected to the mounting groove along the third direction through the opening portion.

13. The electrode assembly shaping device according to claim 12, characterized in that: The mounting member further comprises: at least one fixing hole extending along the first direction and communicating with the mounting groove; A locking member is arranged in the fixing hole to lock the shaping member in the mounting groove to the mounting member.

14. A battery production device, characterized in that: Comprising an electrode assembly shaping device as described in any one of claims 1-13.

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