Battery cell winding device and method and battery manufacturing device

Abstract

The embodiments of the present application provide a battery cell winding device and method and a battery manufacturing device. The battery cell winding device comprises a winding needle (1) and a diameter adjusting device (2); the winding needle (1) comprises at least two needle bodies (11), and the at least two needle bodies (11) are arranged at intervals along a preset circumference and define a hollow cavity; the diameter adjusting device (2) comprises a variable-diameter parts (20), one end of each variable-diameter part (20) is located in the hollow cavity, and the variable-diameter parts (20) are configured to be movable in the axial direction of the winding needle (1) so as to drive, by means of the variable-diameter parts (20), the at least two needle bodies (11) to move in the radial direction of the winding needle (1), thereby adjusting the diameter of the winding needle (1). The battery manufacturing device comprises the battery cell winding device.

Description

Battery cell winding device and method and battery manufacturing device

[0001] This application is based on and claims priority to an application filed in China with application number 202310888021.0 and filing date July 19, 2023. The disclosed content of the Chinese application is hereby introduced as a whole into this application. Technical Field

[0002] The present application relates to the field of battery manufacturing technology, and in particular to a battery cell winding device and method and a battery manufacturing device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] During the battery manufacturing process, the battery cells are wound by a battery cell winding device. The winding quality of the battery cells directly affects the quality of the battery.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0006] Summary of the Invention

[0007] The present application provides a battery cell winding device and method and a battery manufacturing device, which can effectively improve the battery cell winding quality.

[0008] In the first aspect, the present application provides a battery cell winding device, including a winding needle and a diameter adjustment device, the winding needle includes at least two needle bodies, the at least two needle bodies are arranged along a preset circumferential interval and enclosed to form a hollow cavity, the diameter adjustment device includes a diameter reducing portion, one end of the diameter reducing portion is located in the hollow cavity, and the diameter reducing portion is configured to be movable along the axial direction of the winding needle, so as to drive at least two needle bodies to move radially along the winding needle through the diameter reducing portion, thereby adjusting the diameter of the winding needle.

[0009] By providing a variable diameter portion that is movable along the axial direction of the winding needle, the diameter of the winding needle can be adjusted at any time during the winding process. For example, when the pressure on the inner ring increases, the pressure on the inner ring can be released by reducing the diameter of the winding needle to avoid the inner ring gap from becoming smaller, thereby maintaining the consistency of the inner and outer ring diameters, reducing the occurrence of problems such as lithium deposition, inner ring collapse or cracks during battery cycle expansion caused by uneven gap size, and improving the quality of the battery.

[0010] In some embodiments, the diameter of the diameter-reducing portion increases from the first end thereof to the second end thereof, the first end is located in the hollow cavity, and the second end increases relative to the first end.

[0011] The diameter of the reducing portion increases from the first end where it is inserted into the hollow cavity toward the second end opposite to the first end. In this way, during the winding process, the diameter of the winding needle can be reduced as the reducing portion is withdrawn from the hollow cavity, thereby releasing the pressure on the inner ring.

[0012] In some embodiments, the diameter of the reducing portion gradually increases from its first end to its second end, the first end being located in the hollow cavity and the second end being opposite to the first end. In this embodiment, the reducing portion has a tapered structure, and its diameter gradually increases with a smooth transition to avoid a sudden change in diameter.

[0013] In some embodiments, the diameter adjustment device includes a first adjustment device, the first adjustment device includes a first diameter reducing portion, one end of the first diameter reducing portion is located in the hollow cavity, and the first diameter reducing portion is configured to be movable along the axial direction of the winding needle.

[0014] By driving the first diameter-changing portion to move in the axial direction of the winding needle, the needle body can be driven to move in the radial direction of the winding needle through the diameter change of the first diameter-changing portion, thereby adjusting the diameter of the winding needle.

[0015] In some embodiments, the battery cell winding device also includes a first limiting device, which is configured to limit the relative movement between the needle body and the first diameter-changing part in the circumferential direction of the winding needle and / or limit the path of relative movement between the needle body and the first diameter-changing part in the axial direction of the winding needle.

[0016] In some embodiments, by setting a first limiting device, the relative stability of the needle body and the first diameter-changing portion in the circumferential direction of the winding needle can be maintained, preventing the needle body and the first diameter-changing portion from moving relative to each other in the circumferential direction of the winding needle during the winding process, thereby preventing the winding quality of the battery cell from being affected.

[0017] In some embodiments, by setting a first limiting device, the relative movement path of the needle body and the first diameter-changing part can be guided in the axial direction of the winding needle to prevent the needle body from being offset relative to the axial movement of the first diameter-changing part, thereby affecting the winding quality of the battery cell.

[0018] In some embodiments, by setting a first limiting device, the relative stability of the needle body and the first variable diameter part in the circumferential direction of the winding needle can be maintained, preventing the needle body and the first variable diameter part from moving relative to each other in the circumferential direction of the winding needle during the winding process, thereby affecting the winding quality of the battery cell; and the relative movement path of the needle body and the first variable diameter part can be guided in the axial direction of the winding needle, thereby preventing the needle body from shifting relative to the axial movement of the first variable diameter part, thereby affecting the winding quality of the battery cell.

[0019] In some embodiments, the first limiting device includes a slider connected to the needle body and a guide groove provided on the first diameter-reducing portion, the guide groove extends along the axial direction of the winding needle, and the slider is embedded in the guide groove.

[0020] By providing a slider and a guide groove, and making the slider move in the guide groove, the slider can be made to move along the extension direction of the guide groove. The guide groove has a guiding and limiting effect on the movement path of the slider, thereby guiding and limiting the movement path of the needle body relative to the first diameter-changing part; at the same time, the guide groove can also limit the movement of the slider in the circumferential direction of the winding needle, that is, limit the relative movement of the needle body and the first diameter-changing part in the circumferential direction of the winding needle during the winding process, thereby effectively ensuring the winding quality of the battery cell.

[0021] In some embodiments, the slider is rotatably mounted to the needle body. This arrangement allows the slider to rotate relative to the needle body to accommodate changes in the slider's relative position relative to the needle body as it moves along the guide slot, thereby preventing wear between the slider and the guide slot wall and effectively increasing the slider's service life.

[0022] In some embodiments, the battery cell winding device further includes a second limiting device, which is configured to prevent the slider from sliding out of the guide groove.

[0023] By providing the second limiting device, it is possible to prevent the slider from being separated from the guide groove, thereby causing failure of the guiding and limiting functions.

[0024] In some embodiments, the first adjusting device further includes a first driving device, and the first driving device is configured to drive the first diameter-reducing portion to move along the axial direction of the winding needle.

[0025] By setting up a first driving device, the first diameter-changing part can be driven to move along the axial direction of the winding needle, thereby achieving the purpose of automatically driving the first diameter-changing part to move along the axial direction of the winding needle during the winding process, and then achieving automatic adjustment of the winding needle diameter during the winding process.

[0026] In some embodiments, the diameter adjustment device further includes a second adjustment device, the second adjustment device includes a second diameter-changing portion, one end of the second diameter-changing portion is located in the hollow cavity, and the second diameter-changing portion is configured to be movable along the axial direction of the winding needle.

[0027] By driving the second diameter-changing portion to move in the axial direction of the winding needle, the needle body can be driven to move in the radial direction of the winding needle through the diameter change of the second diameter-changing portion, thereby adjusting the diameter of the winding needle.

[0028] In some embodiments, the second adjusting device further includes a second driving device, and the second driving device is configured to drive the second diameter-changing portion to move along the axial direction of the winding needle.

[0029] By setting up a second driving device, the second diameter-changing part can be driven to move along the axial direction of the winding needle, thereby achieving the purpose of automatically driving the second diameter-changing part to move along the axial direction of the winding needle during the winding process, and then achieving automatic adjustment of the winding needle diameter during the winding process.

[0030] In some embodiments, the second diameter-reducing portion is detachably disposed in the hollow cavity.

[0031] By setting the second diameter-changing portion to be detachably arranged in the hollow cavity, the second diameter-changing portion can be inserted into the hollow cavity before winding, so that the diameter of the winding needle can be adjusted by driving the second diameter-changing portion to move along the axial direction of the winding needle during the winding process; and after the winding is completed, the second diameter-changing portion can be separated from the hollow cavity, that is, the second diameter-changing portion can be pulled out from the hollow cavity, so that the wound battery cell can be pulled off the winding needle through the end where the second diameter-changing portion is set, thereby realizing the separation of the battery cell and the winding needle.

[0032] In some embodiments, the diameter adjustment device also includes a second adjustment device, the second adjustment device includes a second diameter reducing portion, the first diameter reducing portion is located at the first end of the hollow cavity, the second diameter reducing portion is located at the second end of the hollow cavity, and the second diameter reducing portion is respectively configured to be movable along the axial direction of the winding needle.

[0033] In this embodiment, the diameter adjustment device includes two adjustment devices, namely a first adjustment device and a second adjustment device. The two adjustment devices are respectively arranged at both ends of the winding needle, and the diameter of the winding needle can be adjusted separately or simultaneously from both ends of the winding needle.

[0034] In some embodiments, the battery cell winding device further includes a positioning device, which is configured to position the winding needle in the axial direction of the winding needle.

[0035] By setting a positioning device, the winding needle can be positioned in the axial direction of the winding needle, ensuring that the winding needle is relatively fixed in the axial direction during the winding process, and preventing the winding quality from being affected by changes in the axial position of the winding needle.

[0036] In some embodiments, the positioning device is detachably connected to the winding needle. By arranging the positioning device and the winding needle to be detachably connected, the positioning device can be connected to the winding needle before winding to ensure that the winding needle is relatively fixed during the winding process. After winding is completed, the winding needle can be removed from the positioning device to remove the wound battery cell from the winding needle, completing the winding of the battery cell.

[0037] In some embodiments, the positioning device includes a fixed block and a movable block, the movable block is movably disposed on the fixed block along the radial direction of the winding needle, and the needle body is in detachable contact with the movable block.

[0038] By movably arranging the movable block on the fixed block, the movable block can move relative to the fixed block to adapt to the diameter change of the winding needle, preventing the positioning device from restricting the diameter change of the winding needle.

[0039] In some embodiments, the needle body is provided with a groove into which the movable block is detachably inserted. Before winding, the movable block is inserted into the groove, thereby connecting the positioning device to the winding needle, and the needle body and the movable block are in contact. After winding is completed, the movable block is released from the groove, thereby separating the positioning device from the winding needle, and the needle body and the movable block are separated.

[0040] In some embodiments, the positioning device further comprises an elastic member, which is arranged between the fixed block and the movable block. By arranging the elastic member, the movable block can be assisted in resetting after moving relative to the fixed block.

[0041] In some embodiments, the fixed block is provided with a receiving groove, and the movable block is arranged in the receiving groove. By providing the receiving groove, the movable block can be arranged in the receiving groove for easy storage.

[0042] In some embodiments, the movable block includes a limiting portion, and the receiving slot is provided with a blocking portion, the limiting portion and the blocking portion cooperating to prevent the movable block from leaving the receiving slot. By providing the limiting portion and the blocking portion, the movable block can be prevented from leaving the receiving slot, which helps maintain the integrity of the fixed block and the movable block.

[0043] In a second aspect, the present application provides a battery manufacturing device, including the above-mentioned battery cell winding device.

[0044] In a second aspect, the present application provides a battery cell winding method, comprising:

[0045] A winding needle is provided, comprising at least two needle bodies, wherein the at least two needle bodies are spaced apart along a preset circumference and enclose a hollow cavity;

[0046] A diameter adjustment device is provided, the diameter adjustment device includes a diameter reducing portion, one end of the diameter reducing portion is located in the hollow cavity, and the diameter reducing portion is configured to be movable along the axial direction of the winding needle;

[0047] The diameter adjusting device is driven to move along the axial direction of the winding needle, so as to drive at least two needle bodies to move along the radial direction of the winding needle through the diameter-changing portion, thereby adjusting the diameter of the winding needle.

[0048] 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, which can be implemented in accordance with the contents of the specification, and 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

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0050] FIG1 is a schematic structural diagram of some embodiments of a battery cell winding device disclosed in the present application;

[0051] FIG2 is a cross-sectional view of section AA in FIG1 ;

[0052] FIG3 is a schematic structural diagram of a first adjustment device in some embodiments of the battery cell winding device disclosed in the present application;

[0053] FIG4 is a front view of a first adjustment device in some embodiments of the battery cell winding device disclosed in the present application;

[0054] FIG5 is a cross-sectional view of section BB in FIG4 ;

[0055] FIG6 is a top view of a positioning device in some embodiments of the battery cell winding device disclosed in the present application;

[0056] FIG7 is a cross-sectional view taken along line CC in FIG6 .

[0057] In the drawings, the drawings are not drawn to scale.

[0058] Marking description: 1. Winding needle; 11. Needle body; 111. Groove; 12. Slider; 2. Diameter adjustment device; 20. Variable diameter portion; 21. First adjustment device; 211. First variable diameter portion; 2111. Guide groove; 212. First connecting portion; 22. Second adjustment device; 221. Second variable diameter portion; 222. Second connecting portion; 3. Positioning device; 31. Fixed block; 311. Accommodating groove; 312. Blocking portion; 32. Movable block; 321. Limiting portion; 33. Elastic member. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In addition, the term "perpendicular" does not mean perpendicular in the strict sense, but rather means within the allowable error range. The term "parallel" does not mean parallel in the strict sense, but rather means within the allowable error range.

[0062] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two, unless otherwise specifically defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise specifically defined.

[0065] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components or interactions between two components. 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 based on the specific circumstances.

[0067] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0068] During the manufacturing process of the battery, the manufacture of the core component battery cell requires winding the positive electrode sheet, the negative electrode sheet and the diaphragm through the battery cell winding device. The present application study found that during the battery cell winding process, since the winding needle diameter of the winding device is very small, and the diameter of the battery cell finally wound is very large, that is, the ratio of the winding needle diameter to the battery cell diameter is very small, resulting in the pressure on the inner circle of the battery cell during the winding process being much greater than the outer circle. In this way, after winding, it is very easy to have a small gap between the two adjacent layers of battery cell materials in the inner circle, and a large gap between the two adjacent layers of battery cell materials in the outer circle. The uneven gap size will cause the battery to have problems such as lithium deposition, collapse of the inner circle or cracks during cyclic expansion, affecting the quality of the battery. Therefore, it is necessary to control the size of the gap between the two adjacent layers of material of the battery cell after winding.

[0069] Based on the above requirements, the present application improves the structure of the battery cell winding device. In the battery cell winding device provided in the present application, it includes a winding needle and a diameter adjustment device. The winding needle includes a plurality of needle bodies, and the plurality of needle bodies are arranged at intervals along a preset circumference, and the plurality of needle bodies enclose a hollow cavity. The diameter adjustment device includes a diameter-changing portion whose diameter changes along the axial direction of the winding needle. One end of the diameter-changing portion is located in the hollow cavity, and the diameter-changing portion is movable along the axial direction of the winding needle. In this way, when the diameter-changing portion moves along the axial direction of the winding needle, the diameter-changing portion drives the needle body to move along the radial direction of the winding needle, thereby adjusting the diameter of the winding needle. By adjusting the diameter of the winding needle at any time during the winding process, such as reducing the diameter of the winding needle when the pressure of the inner ring increases, the pressure of the inner ring can be released to prevent the gap between the two adjacent layers of material of the inner ring from becoming smaller, thereby effectively controlling the consistency of the size of the gap between the inner and outer rings.

[0070] The cell winding device disclosed in the embodiment of the present application is suitable for use in batteries composed of wound cell components, and the batteries can be used in, but are not limited to, electrical equipment such as vehicles, ships, or aircraft. Electrical equipment can be, but are not limited to, mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys, and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0071] The battery cell winding device disclosed in the embodiment of the present application can be used as a component of a battery manufacturing device. The battery cell winding device is used to complete the battery cell winding process, and then other battery manufacturing processes are completed through other parts of the battery manufacturing device.

[0072] Referring to Figures 1 and 2, in some embodiments of the battery cell winding device provided in the present application, the battery cell winding device includes a winding needle 1 and a diameter adjustment device 2, the winding needle 1 includes at least two needle bodies 11, and the at least two needle bodies 11 are arranged along a preset circumferential interval and enclosed to form a hollow cavity, the diameter adjustment device 2 includes a diameter-changing portion 20 whose diameter changes along the axial direction of the winding needle 1, the diameter-changing portion 20 is inserted into the hollow cavity, and the diameter-changing portion 20 is configured to be movable along the axial direction of the winding needle 1, so as to drive at least two needle bodies 11 to move radially along the winding needle 1 through the diameter-changing portion 20, thereby adjusting the diameter of the winding needle 1.

[0073] The number of the needle bodies 11 can be two, three, four or more. There is a gap between two adjacent needle bodies 11 so that the diameter of the winding needle 1 can be adjusted by the radial movement of the needle bodies 11 as needed.

[0074] By providing a variable diameter portion 20 movable along the axial direction of the winding needle 1, the diameter of the winding needle 1 can be adjusted at any time during the winding process. For example, when the pressure of the inner ring increases, the pressure of the inner ring can be released by reducing the diameter of the winding needle 1 to avoid the inner ring gap from becoming smaller, thereby maintaining the consistency of the inner and outer ring diameters, reducing the occurrence of problems such as lithium deposition, inner ring collapse or cracks during cycle expansion caused by uneven gap size, and improving the quality of the battery.

[0075] In some embodiments, the diameter of the diameter-reducing portion 20 increases from a first end thereof to a second end thereof, the first end is located in the hollow cavity, and the second end is opposite to the first end.

[0076] As shown in Figures 1 and 2, the diameter of the reducing portion 20 increases from the first end where it is inserted into the hollow cavity toward the second end away from the first end (i.e., toward the second end opposite to the first end). In this way, during the winding process, the diameter of the winding needle 1 can be reduced as the reducing portion 20 is withdrawn from the hollow cavity, thereby releasing the inner ring pressure.

[0077] In some embodiments, the diameter of the reducing portion 20 gradually increases from its first end to its second end, with the first end located in the hollow cavity and the second end opposite the first end. In this embodiment, the reducing portion 20 has a tapered structure, and its diameter gradually increases with a smooth transition to avoid a sudden change in diameter.

[0078] Referring to Figures 3 to 5, in some embodiments, the diameter adjustment device 2 includes a first adjustment device 21, the first adjustment device 21 includes a first diameter-changing portion 211 whose diameter changes along the axial direction of the winding needle 1, one end of the first diameter-changing portion 211 is located in the hollow cavity, and the first diameter-changing portion 211 is configured to be movable along the axial direction of the winding needle 1.

[0079] By driving the first diameter-changing portion 211 to move along the axial direction of the winding needle 1 , the needle body 11 can be driven to move along the radial direction of the winding needle 1 through the diameter change of the first diameter-changing portion 211 , thereby adjusting the diameter of the winding needle 1 .

[0080] In some embodiments, the battery cell winding device also includes a first limiting device, which is configured to limit the relative movement between the needle body 11 and the first diameter-changing portion 211 in the circumferential direction of the winding needle 1 and / or limit the path of relative movement between the needle body 11 and the first diameter-changing portion 211 in the axial direction of the winding needle 1.

[0081] In some embodiments, by setting a first limiting device, the relative stability of the needle body 11 and the first diameter-changing portion 211 in the circumferential direction of the winding needle 1 can be maintained, preventing the needle body 11 and the first diameter-changing portion 211 from moving relative to each other in the circumferential direction of the winding needle 1 during the winding process, thereby preventing the winding quality of the battery cell from being affected.

[0082] In some embodiments, by setting a first limiting device, the relative movement path of the needle body 11 and the first diameter-changing part 211 can be guided in the axial direction of the winding needle 1 to prevent the needle body 11 from being offset relative to the axial movement of the first diameter-changing part 211, thereby affecting the winding quality of the battery cell.

[0083] In some embodiments, by setting a first limiting device, the relative stability of the needle body 11 and the first variable diameter portion 211 in the circumferential direction of the winding needle 1 can be maintained, preventing the needle body 11 and the first variable diameter portion 211 from moving relative to each other in the circumferential direction of the winding needle 1 during the winding process, thereby affecting the winding quality of the battery cell; and the relative movement path of the needle body 11 and the first variable diameter portion 211 can be guided in the axial direction of the winding needle 1 to prevent the needle body 11 from shifting relative to the axial movement of the first variable diameter portion 211, thereby affecting the winding quality of the battery cell.

[0084] There are many options for the specific structure of the first limiting device.

[0085] In some embodiments, the first limiting device includes a slider 12 connected to the needle body 11 and a guide groove 2111 provided on the first diameter-reducing portion 211 . The guide groove 2111 extends along the axial direction of the winding needle 1 , and the slider 12 is embedded in the guide groove 2111 .

[0086] By providing a slider 12 and a guide groove 2111, and making the slider 12 move in the guide groove 2111, the slider 12 can be made to move along the extension direction of the guide groove 2111. The guide groove 2111 has a guiding and limiting effect on the movement path of the slider 12, thereby guiding and limiting the movement path of the needle body 11 relative to the first diameter-changing portion 211; at the same time, the guide groove 2111 can also limit the movement of the slider 12 in the circumferential direction of the winding needle 1, that is, limit the relative movement of the needle body 11 and the first diameter-changing portion 211 in the circumferential direction of the winding needle 1 during the winding process, thereby effectively ensuring the winding quality of the battery cell.

[0087] In some embodiments, the number of sliders 12 and guide slots 2111 is the same as the number of needle bodies 11 , each needle body 11 is connected to a slider 12 , and each slider 12 corresponds to a guide slot 2111 .

[0088] In some embodiments, the slider 12 is rotatably mounted on the needle body 11. This arrangement allows the slider 12 to rotate relative to the needle body 11 to adapt to changes in the relative position of the slider 12 relative to the needle body 11 during its movement along the guide groove 2111, thereby preventing wear between the slider 12 and the wall of the guide groove 2111 and effectively increasing the service life of the slider 12.

[0089] In some embodiments, the battery cell winding device further includes a second limiting device, which is configured to prevent the slider 12 from sliding out of the guide groove 2111 .

[0090] By providing the second limiting device, the slider 12 can be prevented from being separated from the guide groove 2111, which would cause the failure of the guiding and limiting functions.

[0091] The second limiting device can have a variety of structural options. For example, the slider 12 can be configured as a variable-diameter slider, with the guide groove 2111 shaped to match the slider 12, thereby limiting the separation of the slider 12 from the guide groove 2111 by varying the slider 12's diameter. Another example is a T-shaped slider, where the protruding portion of the T-shaped slider is constrained within the guide groove 2111, preventing relative movement in the separation direction, thereby preventing the slider 12 from separating.

[0092] In some embodiments, the first adjusting device 21 further includes a first driving device, which is configured to drive the first diameter-reducing portion 211 to move along the axial direction of the winding needle 1 .

[0093] By setting up a first driving device, the first diameter-changing portion 211 can be driven to move axially along the winding needle 1, thereby achieving the purpose of automatically driving the first diameter-changing portion 211 to move axially along the winding needle 1 during the winding process, thereby achieving automatic adjustment of the diameter of the winding needle 1 during the winding process.

[0094] The first driving device can be a driving element such as an oil cylinder, an air cylinder or a motor.

[0095] In some embodiments, the diameter adjustment device 2 includes a second adjustment device 22, the second adjustment device 22 includes a second diameter-changing portion 221 whose diameter changes along the axial direction of the winding needle 1, one end of the second diameter-changing portion 221 is located in the hollow cavity, and the second diameter-changing portion 221 is respectively configured to be movable along the axial direction of the winding needle 1.

[0096] By driving the second diameter-changing portion 221 to move along the axial direction of the winding needle 1 , the needle body 11 can be driven to move along the radial direction of the winding needle 1 through the diameter change of the second diameter-changing portion 221 , thereby adjusting the diameter of the winding needle 1 .

[0097] In some embodiments, the second adjusting device 22 further includes a second driving device, which is configured to drive the second diameter-changing portion 221 to move along the axial direction of the winding needle 1 .

[0098] By setting up a second driving device, the second diameter-changing portion 221 can be driven to move axially along the winding needle 1, thereby achieving the purpose of automatically driving the second diameter-changing portion 221 to move axially along the winding needle 1 during the winding process, thereby achieving automatic adjustment of the diameter of the winding needle 1 during the winding process.

[0099] The second driving device can be a driving element such as an oil cylinder, an air cylinder or a motor.

[0100] In some embodiments, the second diameter-reducing portion 221 is detachably disposed in the hollow cavity. “Detachable” means that the second diameter-reducing portion 221 can be inserted into the hollow cavity and can also be withdrawn from the hollow cavity, even if the second diameter-reducing portion 221 is separated from the winding needle 1 .

[0101] By setting the second diameter-changing portion 221 to be detachably arranged in the hollow cavity, the second diameter-changing portion 221 can be inserted into the hollow cavity before winding, so that the diameter of the winding needle 1 can be adjusted by driving the second diameter-changing portion 221 to move along the axial direction of the winding needle 1 during the winding process; and after the winding is completed, the second diameter-changing portion 221 can be separated from the hollow cavity, that is, the second diameter-changing portion 221 can be pulled out from the hollow cavity, so that the wound battery cell can be pulled off the winding needle 1 through this end where the second diameter-changing portion 221 is set, thereby realizing the separation of the battery cell and the winding needle 1.

[0102] In some embodiments, the diameter adjustment device 2 also includes a second adjustment device 22, the second adjustment device 22 includes a second diameter-changing portion 221 whose diameter changes along the axial direction of the winding needle 1, the first diameter-changing portion 211 is located at the first end of the hollow cavity, and the second diameter-changing portion 221 is located at the second end of the hollow cavity, and the second diameter-changing portion 221 is respectively configured to be movable along the axial direction of the winding needle 1.

[0103] In this embodiment, the diameter adjustment device 2 includes two adjustment devices, namely a first adjustment device 21 and a second adjustment device 22. The two adjustment devices are respectively arranged at both ends of the winding needle 1, and the diameter of the winding needle 1 can be adjusted separately or simultaneously from both ends of the winding needle 1.

[0104] In some embodiments, the battery cell winding device further includes a positioning device 3 , which is configured to position the winding needle 1 in the axial direction of the winding needle 1 .

[0105] By providing the positioning device 3, the winding needle 1 can be positioned in the axial direction of the winding needle 1, ensuring that the winding needle 1 is relatively fixed in the axial direction during the winding process, and preventing the winding quality from being affected by changes in the axial position of the winding needle 1.

[0106] In some embodiments, the positioning device 3 is detachably connected to the winding needle 1. By arranging the positioning device 3 and the winding needle 1 to be detachably connected, the positioning device 3 can be connected to the winding needle 1 before winding to ensure that the winding needle 1 is relatively fixed during the winding process. After the winding is completed, the winding needle 1 can be removed from the positioning device 3 to pull the wound battery cell off the winding needle 1, completing the winding of the battery cell.

[0107] As shown in Figures 6 and 7, in some embodiments, the positioning device 3 includes a fixed block 31 and a movable block 32. The movable block 32 is movably provided on the fixed block 31 along the radial direction of the winding needle 1, and the needle body 11 is in detachable contact with the movable block 32.

[0108] By movably arranging the movable block 32 on the fixed block 31 , the movable block 32 can move relative to the fixed block 31 to adapt to the diameter change of the winding needle 1 and prevent the positioning device 3 from restricting the diameter change of the winding needle 1 .

[0109] The needle body 11 and the movable block 32 are in detachable contact, meaning that the needle body 11 and the movable block 32 can be in contact with each other or separated from each other, i.e., not in contact. For example, before winding, when the positioning device 3 is connected to the winding needle 1, the needle body 11 is in contact with the movable block 32, and as the diameter of the winding needle 1 changes, the movable block 32 moves relative to the fixed block 31. After winding is completed and the winding needle 1 is removed from the positioning device 3, the needle body 11 and the movable block 32 are separated.

[0110] In some embodiments, the needle body 11 is provided with a groove 111, into which the movable block 32 is detachably inserted. Before winding, the movable block 32 is inserted into the groove 111, thereby connecting the positioning device 3 to the winding needle 1. At this time, the needle body 11 and the movable block 32 are in contact. After winding is completed, the movable block 32 is disengaged from the groove 111, thereby separating the positioning device 3 from the winding needle 1. At this time, the needle body 11 and the movable block 32 are separated.

[0111] In some embodiments, the positioning device 3 further includes an elastic member 33 , which is disposed between the fixed block 31 and the movable block 32 .

[0112] The elastic member 33 can assist the movable block 32 in returning to its original position after moving relative to the fixed block 31 .

[0113] The elastic member 33 can be a spring, rubber or other elastic member.

[0114] In some embodiments, two ends of the elastic member 33 are connected to the fixed block 31 and the movable block 32 respectively.

[0115] In some embodiments, the fixed block 31 is provided with a receiving groove 311 , and the movable block 32 is disposed in the receiving groove 311 .

[0116] By providing the receiving groove 311 , the movable block 32 can be placed in the receiving groove 311 for easy storage.

[0117] In some embodiments, the movable block 32 includes a limiting portion 321 , and the receiving slot 311 is provided with a blocking portion 312 . The limiting portion 321 cooperates with the blocking portion 312 to prevent the movable block 32 from leaving the receiving slot 311 .

[0118] By providing the limiting portion 321 and the blocking portion 312 , the movable block 32 can be prevented from leaving the receiving groove 311 , which is beneficial for maintaining the integrity of the fixed block 31 and the movable block 32 .

[0119] The present application also provides a battery cell winding method, the method comprising:

[0120] A winding needle 1 is provided, comprising at least two needle bodies 11, wherein the at least two needle bodies 11 are spaced apart along a preset circumference and enclose a hollow cavity;

[0121] A diameter adjustment device 2 is provided. The diameter adjustment device 2 includes a reducing portion 20 whose diameter decreases in a direction approaching the winding needle 1. One end of the reducing portion 20 is located in the hollow cavity, and the reducing portion 20 is configured to be movable along the axial direction of the winding needle 1.

[0122] The diameter adjusting device 2 is driven to move along the axial direction of the winding needle 1 to drive at least two needle bodies 11 to move along the radial direction of the winding needle 1 through the diameter reducing portion 20 , thereby adjusting the diameter of the winding needle 1 .

[0123] By using the battery cell winding method provided in the embodiment of the present application to wind the battery cell, the diameter of the winding needle 1 can be adjusted in real time as needed during the winding process to achieve the requirement of changing the diameter while winding, release the pressure on the inner circle, and effectively solve the problem of uneven gap size between the inner and outer circles.

[0124] Those skilled in the art will understand that, in the above-mentioned method of a specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0125] The structure and working process of an embodiment of the battery cell winding device provided in the present application are described below with reference to Figures 1 to 7.

[0126] As shown in FIG1 and FIG2 , the battery cell winding device includes a winding needle 1 , a diameter adjustment device 2 and a positioning device 3 .

[0127] The winding needle 1 comprises a four-petal needle body 11, which is arranged at intervals along the circumferential direction, with a gap between two adjacent needle bodies 11. A hollow cavity is formed in the center of the four-petal needle body 11.

[0128] The first end of the needle body 11 is connected to a rotatable slider 12 , and the second end is provided with a groove 111 .

[0129] The diameter adjustment device 2 includes a first adjustment device 21 and a second adjustment device 22. The first adjustment device 21 is located at the first end of the winding needle 1, and the second adjustment device 22 is located at the second end of the winding needle 1. During use, the first adjustment device 21 can remain connected to the winding needle 1, while the second adjustment device 22 can be connected during the winding process. After winding, the second adjustment device 22 can be separated from the winding needle 1 to facilitate removal of the wound battery cell from the winding needle 1.

[0130] The first adjustment device 21 includes a first reducing portion 211 and a first connecting portion 212. The diameter of the first reducing portion 211 gradually decreases from the first connecting portion 212 toward the first reducing portion 211. The end of the first reducing portion 211 away from the first connecting portion 212 is located within the hollow cavity of the winding needle 1. The first connecting portion 212 can be connected to a first drive device, which is used to drive the first adjustment device 21 to move axially along the winding needle 1.

[0131] The second adjusting device 22 includes a second reducing portion 221 and a second connecting portion 222. The diameter of the second reducing portion 221 gradually decreases from the second connecting portion 222 toward the second reducing portion 221. The end of the second reducing portion 221, distal from the second connecting portion 222, is located within the hollow cavity of the winding needle 1. The second connecting portion 222 can be connected to a second driving device for driving the second adjusting device 22 to move axially along the winding needle 1.

[0132] As shown in FIG. 3 to FIG. 5 , a guide groove 2111 extending in the axial direction is provided on the first diameter-reducing portion 211 , and the slider 12 can be embedded in the guide groove 2111 and move along the guide groove 2111 .

[0133] As shown in FIG. 6 and FIG. 7 , the positioning device 3 includes a fixed block 31 , a movable block 32 and an elastic member 33 .

[0134] The fixed block 31 is provided with a receiving groove 311, and the movable block 32 is movably disposed in the receiving groove 311. The elastic member 33 is connected between the fixed block 31 and the movable block 32.

[0135] The fixed block 31 is also provided with a blocking portion 312, which partially blocks the opening of the receiving slot 311. The movable block 32 is provided with a limiting portion 321. The limiting portion 321 and the main body of the movable block 32 form a "7" shape. The limiting portion 321 is blocked by the blocking portion 312, preventing the movable block 32 from falling out of the receiving slot 311.

[0136] The following describes the winding process of the battery cell winding device:

[0137] First, before winding, the winding needle 1 and the positioning device 3 are connected: the first driving device drives the first adjusting device 21 to drive the winding needle 1 to the right, and the second end of the winding needle 1 moves to the right relative to the positioning device 3, so that the movable block 32 first moves radially outward under the top of the needle body 11. Then, when the winding needle 1 moves to the position where the groove 111 on the needle body 11 is aligned with the movable block 32, the movable block 32 is embedded in the groove 111, thereby realizing the connection between the winding needle 1 and the positioning device 3 and positioning the axial position of the winding needle 1;

[0138] Then, the second driving device pushes the second adjusting device 22 to the left, and the movable block 32 moves radially outward, and the diameter of the second end of the winding needle 1 increases;

[0139] After the first adjusting device 21 and the second adjusting device 22 are pushed to the required diameter of the winding needle 1, they are fixed and winding begins;

[0140] During the winding process, the first adjusting device 21 and the second adjusting device 22 are pulled outward at the same speed, so that the diameter of the winding needle 1 is gradually reduced, and the pressure on the inner ring is released until the winding is completed;

[0141] After the winding is completed, the second adjusting device 22 is pulled outward to further reduce the diameter of the winding needle 1 until the movable block 32 is disengaged from the groove 111 of the winding needle 1;

[0142] Finally, the winding needle 1 is pulled out, the wound battery cell is removed, the mechanism is reset, and a winding cycle is completed.

[0143] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell winding device, comprising: A winding needle (1) comprises at least two needle bodies (11), wherein the at least two needle bodies (11) are arranged at intervals along a preset circumference and enclose a hollow cavity; and The diameter adjustment device (2) comprises a diameter-changing portion (20), one end of which is located in the hollow cavity, and the diameter-changing portion (20) is configured to be movable along the axial direction of the winding needle (1), so as to drive at least two needle bodies (11) to move radially along the winding needle (1) through the diameter-changing portion (20), thereby adjusting the diameter of the winding needle (1).

2. The battery cell winding device according to claim 1, wherein: The diameter of the diameter-changing portion (20) increases from its first end to its second end, the first end is located in the hollow cavity, and the second end is opposite to the first end.

3. The battery cell winding device according to claim 1 or 2, wherein: The diameter of the diameter-changing portion (20) gradually increases from its first end to its second end, the first end is located in the hollow cavity, and the second end is opposite to the first end.

4. The battery core winding device according to any one of claims 1 to 3, wherein: The diameter adjustment device (2) comprises a first adjustment device (21), the first adjustment device (21) comprises a first diameter reducing portion (211), one end of the first diameter reducing portion (211) is located in the hollow cavity, and the first diameter reducing portion (211) is configured to be movable along the axial direction of the winding needle (1).

5. The battery cell winding device according to claim 4 further comprises a first limiting device, wherein the first limiting device is configured to limit the relative movement between the needle body (11) and the first diameter-changing portion (211) in the circumferential direction of the winding needle (1) and / or to limit the path of relative movement between the needle body (11) and the first diameter-changing portion (211) in the axial direction of the winding needle (1).

6. The battery cell winding device according to claim 5, wherein: The first limiting device comprises a slider (12) connected to the needle body (11) and a guide groove (2111) arranged on the first diameter-changing portion (211); the guide groove (2111) extends along the axial direction of the winding needle (1); and the slider (12) is embedded in the guide groove (2111).

7. The battery cell winding device according to claim 6, wherein: The slider (12) is rotatably mounted on the needle body (11).

8. The battery cell winding device according to claim 6 or 7, further comprising a second limiting device, wherein the second limiting device is configured to prevent the slider (12) from sliding out of the guide groove (2111).

9. The battery core winding device according to any one of claims 4 to 8, wherein: The first adjusting device (21) further comprises a first driving device, wherein the first driving device is configured to drive the first diameter reducing portion (211) to move along the axial direction of the winding needle (1).

10. The battery core winding device according to any one of claims 1 to 9, wherein: The diameter adjustment device (2) comprises a second adjustment device (22), the second adjustment device (22) comprises a second diameter-changing portion (221), one end of the second diameter-changing portion (221) is located in the hollow cavity, and the second diameter-changing portion (221) is respectively configured to be movable along the axial direction of the winding needle (1).

11. The battery core winding device according to claim 10, wherein: The second adjusting device (22) further comprises a second driving device, wherein the second driving device is configured to drive the second diameter reducing portion (221) to move along the axial direction of the winding needle (1).

12. The battery core winding device according to claim 10 or 11, wherein: The second diameter-changing portion (221) is detachably arranged in the hollow cavity.

13. The battery core winding device according to any one of claims 4 to 9, wherein: The diameter adjustment device (2) further comprises a second adjustment device (22), wherein the second adjustment device (22) comprises a second diameter-changing portion (221), wherein the first diameter-changing portion (211) is located at the first end of the hollow cavity, and the second diameter-changing portion (221) is located at the second end of the hollow cavity, and the second diameter-changing portion (221) is respectively configured to be movable along the axial direction of the winding needle (1).

14. The battery cell winding device according to any one of claims 1 to 13, further comprising a positioning device (3), wherein the positioning device (3) is configured to position the winding needle (1) in the axial direction of the winding needle (1).

15. The battery core winding device according to any one of claims 14, wherein: The positioning device (3) is detachably connected to the winding needle (1).

16. The battery cell winding device according to claim 14 or 15, wherein: The positioning device (3) comprises a fixed block (31) and a movable block (32); the movable block (32) is movably arranged on the fixed block (31) along the radial direction of the winding needle (1); and the needle body (11) is in detachable contact with the movable block (32).

17. The battery cell winding device according to claim 16, wherein: The needle body (11) is provided with a groove (111), and the movable block (32) is detachably embedded in the groove (111).

18. The battery core winding device according to claim 16 or 17, wherein: The positioning device (3) further comprises an elastic member (33), wherein the elastic member (33) is arranged between the fixed block (31) and the movable block (32).

19. The battery core winding device according to any one of claims 16 to 18, wherein: The fixed block (31) is provided with a receiving groove (311), and the movable block (32) is arranged in the receiving groove (311).

20. The battery cell winding device according to claim 19, wherein: The movable block (32) comprises a limiting portion (321), the containing groove (311) is provided with a blocking portion (312), and the limiting portion (321) cooperates with the blocking portion (312) to prevent the movable block (32) from leaving the containing groove (311).

21. A battery manufacturing device, comprising the battery cell winding device according to any one of claims 1 to 20.

22. A battery core winding method, comprising: A winding needle (1) is provided, comprising at least two needle bodies (11), wherein the at least two needle bodies (11) are arranged at intervals along a preset circumference and enclose a hollow cavity; A diameter adjustment device (2) is provided, the diameter adjustment device (2) comprising a diameter reducing portion (20), one end of the diameter reducing portion (20) is located in the hollow cavity, and the diameter reducing portion (20) is configured to be movable along the axial direction of the winding needle (1); The diameter adjustment device (2) is driven to move along the axial direction of the winding needle (1), so as to drive at least two needle bodies (11) to move along the radial direction of the winding needle (1) through the diameter-changing portion (20), thereby adjusting the diameter of the winding needle (1).

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