Electrode assembly manufacturing apparatus and method, and battery manufacturing apparatus and method

Abstract

The embodiment of the invention provides an electrode assembly manufacturing device and method and battery manufacturing equipment and method.The electrode assembly manufacturing device comprises a winding needle and a plurality of unwinding devices, the unwinding devices are configured to provide a plurality of coiled materials for the winding needle, the coiled materials are wound around the winding needle to form an electrode assembly, and the electrode assembly is arranged on the winding needle. In the winding process, the multiple coiled materials generate multiple acting forces on the winding needle, and the relative positions of the multiple unwinding devices are configured to enable the resultant force of the multiple acting forces, the gravity of the coiled materials wound on the winding needle and the gravity of the winding needle to be basically zero. A battery manufacturing apparatus includes an electrode assembly manufacturing apparatus.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrode assembly manufacturing device and method, and a battery manufacturing device and method. 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] The quality of a battery depends largely on the process by which it is manufactured.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] The present application provides an electrode assembly manufacturing device and method, and a battery manufacturing device and method, which can effectively improve the manufacturing quality of the electrode assembly.

[0006] In a first aspect, the present application provides an electrode assembly manufacturing device, comprising a winding needle and a plurality of unwinding devices, wherein the plurality of unwinding devices are configured to provide a plurality of coils to the winding needle, and the plurality of coils are wound onto the winding needle to form an electrode assembly, wherein during the winding process, the plurality of coils exert a plurality of forces on the winding needle, and the relative positions of the plurality of unwinding devices are constructed so that the resultant force of the plurality of forces, the gravity of the coils wound on the winding needle, and the gravity of the winding needle is substantially zero.

[0007] By modifying the relative positions of multiple unwinding devices, the combined forces of multiple forces exerted on the winding needle by multiple coils, the gravity of the coils wound on the winding needle and the gravity of the winding needle are made substantially zero, thereby minimizing the bending deformation of the winding needle, thereby avoiding problems such as wrinkling and poor alignment of the membrane during winding, thereby effectively improving the quality of the electrode assembly and the overall quality of the battery; it can also avoid rework due to problems such as wrinkling and poor alignment of the membrane, thereby improving the winding efficiency, and further improving the manufacturing efficiency of the electrode assembly and the battery.

[0008] In some embodiments, the electrode assembly manufacturing apparatus further includes an adjustment mechanism configured to adjust a position of at least one of the plurality of coils relative to the winding needle to adjust a winding angle of the coil.

[0009] By setting up the adjustment mechanism, the position of the coil can be adjusted as needed, thereby adjusting the coil entry angle, that is, adjusting the direction of the tension on the coil received by the coiling needle, thereby providing conditions for adjusting the resultant force received by the coiling needle.

[0010] By setting up the adjustment mechanism, the electrode assembly manufacturing device can be compatible with products and winding needles of different specifications, and the compatibility of the winding needle force offset winding can be improved. It can also effectively reduce the bending deformation of the winding needle, avoid wrinkles during winding, poor membrane alignment and other problems, and improve winding efficiency.

[0011] In some embodiments, the adjustment mechanism is configured to adjust the position of at least one of the plurality of coils relative to the winding needle in real time during the winding process, so as to adjust the winding angle of the coil in real time.

[0012] In the above embodiment, the adjustment mechanism can adjust the winding angle of the coil in real time, so that the resultant force of the forces exerted on the winding needle from multiple unwinding devices can change with the gravity of the coil that is constantly increasing on the winding needle, thereby achieving the purpose of adapting to the change in the gravity of the winding needle, and always maintaining the size of the resultant force exerted on the winding needle so as not to cause the winding needle to bend and deform, so as to achieve dynamic compensation of the forces exerted on the winding needle throughout the entire winding process, further effectively ensuring the straightness of the winding needle, and avoiding problems such as wrinkling and poor alignment of the diaphragm.

[0013] In some embodiments, the adjustment mechanism includes a driving member, a connecting member and a contact head, the connecting member connects the driving member and the contact head, the contact head contacts the coil, and the driving member is configured to drive the coil to move relative to the winding needle to adjust the winding angle of the coil.

[0014] The driving part can be a motor, a cylinder or a pneumatic cylinder. The connecting part can be a hard connecting rod. The contact head can be in a spherical shape to reduce the scratches on the coil and effectively protect the coil.

[0015] In some embodiments, the electrode assembly manufacturing device also includes a detection device, which is configured to detect the weight or length of the coil wound on the winding needle during the winding process. The detection device is connected to the adjustment mechanism signal so that the adjustment mechanism adjusts the position of at least one of the multiple unwinding devices relative to the winding needle according to the detection result of the detection device.

[0016] By setting up the detection device, the weight change of the winding needle can be detected at any time, providing an adjustment basis for the adjustment mechanism.

[0017] In some embodiments, the multiple unwinding devices include a first unwinding device for providing a first pole piece to the winding needle, a second unwinding device for providing a second pole piece to the winding needle, a third unwinding device for providing a first isolation film to the winding needle, and a fourth unwinding device for providing a second isolation film to the winding needle, and the polarity of the first pole piece is opposite to that of the second pole piece.

[0018] In the above embodiment, the electrode assembly includes a double-layer electrode sheet and a double-layer isolation membrane.

[0019] In some embodiments, the angle between the rolling direction of the first pole piece and the rolling direction of the second pole piece is greater than or equal to 60° and less than or equal to 180°; and / or, the angle between the rolling direction of the first isolation membrane and the rolling direction of the second isolation membrane is greater than or equal to 60° and less than or equal to 180°.

[0020] Setting the angle between the winding direction of the first pole piece and the winding direction of the second pole piece and the angle between the winding direction of the first isolation membrane and the winding direction of the second isolation membrane to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force generated by the first pole piece, the second pole piece, the first isolation membrane and the second isolation membrane on the winding needle and the total gravity of the winding needle and the coil basically zero, thereby facilitating the arrangement of the first unwinding device, the second unwinding device, the third unwinding device and the fourth unwinding device.

[0021] In some embodiments, the electrode assembly manufacturing device also includes a first composite structure and a second composite structure, the first composite structure is configured to composite the first electrode sheet and the first isolation film into a first composite electrode sheet before winding, and the second composite structure is configured to composite the second electrode sheet and the second isolation film into a second composite electrode sheet before winding, and the angle between the winding direction of the first composite electrode sheet and the winding direction of the second composite electrode sheet is greater than or equal to 60° and less than or equal to 180°.

[0022] The first electrode piece and the first isolation film are firstly combined into a first composite electrode piece by a first composite mechanism, and the second electrode piece and the second isolation film are firstly combined into a second composite electrode piece by a second composite mechanism, so that the winding efficiency can be effectively improved.

[0023] Setting the angle between the winding direction of the first composite pole piece and the winding direction of the second composite pole piece to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force generated by the first composite pole piece and the second composite pole piece on the winding needle and the total gravity of the winding needle and the coiled material basically zero, thereby facilitating the arrangement of the first composite mechanism and the second composite mechanism.

[0024] In some embodiments, the multiple unwinding devices also include a fifth unwinding device for providing a third pole piece to the winding needle, a sixth unwinding device for providing a fourth pole piece to the winding needle, a seventh unwinding device for providing a third isolation film to the winding needle, and an eighth unwinding device for providing a fourth isolation film to the winding needle, and the polarity of the third pole piece is opposite to that of the fourth pole piece.

[0025] In the above embodiment, the electrode assembly includes four layers of electrode sheets and four layers of isolation films.

[0026] In some embodiments, the angle between the rolling direction of the third pole piece and the rolling direction of the fourth pole piece is greater than or equal to 60° and less than or equal to 180°; and / or, the angle between the rolling direction of the third isolation membrane and the rolling direction of the fourth isolation membrane is greater than or equal to 60° and less than or equal to 180°.

[0027] Setting the angle between the winding direction of the third pole piece and the winding direction of the fourth pole piece and the angle between the winding direction of the third isolation membrane and the winding direction of the fourth isolation membrane to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force generated by the third pole piece, the fourth pole piece, the third isolation membrane and the fourth isolation membrane on the winding needle and the total gravity of the winding needle and the coil basically zero, and facilitate the arrangement of the fifth unwinding device, the sixth unwinding device, the seventh unwinding device and the eighth unwinding device.

[0028] In some embodiments, the electrode assembly manufacturing device also includes a third composite structure and a fourth composite structure. The third composite structure is configured to composite the third pole sheet and the third isolation membrane into a third composite pole sheet before winding. The fourth composite structure is configured to composite the fourth pole sheet and the fourth isolation membrane into a fourth composite pole sheet before winding. The angle between the winding direction of the third composite pole sheet and the winding direction of the fourth composite pole sheet is greater than or equal to 60° and less than or equal to 180°.

[0029] The third electrode piece and the third isolation film are firstly combined into a third composite electrode piece by the third composite mechanism, and the fourth electrode piece and the fourth isolation film are firstly combined into a fourth composite electrode piece by the fourth composite mechanism, so that the winding efficiency can be effectively improved.

[0030] Setting the angle between the winding direction of the third composite pole piece and the winding direction of the fourth composite pole piece to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force exerted by the third composite pole piece and the fourth composite pole piece on the winding needle and the total gravity of the winding needle and the coil basically zero, thereby facilitating the arrangement of the third composite mechanism and the fourth composite mechanism.

[0031] In some embodiments, the angle between the rolling direction of the first composite pole sheet and the rolling direction of the third composite pole sheet is not greater than 180°; and / or the angle between the rolling direction of the second composite pole sheet and the rolling direction of the fourth composite pole sheet is not greater than 180°.

[0032] The angle between the winding direction of the first composite pole sheet and the winding direction of the third composite pole sheet and the angle between the winding direction of the second composite pole sheet and the winding direction of the fourth composite pole sheet are both set to be no greater than 180°. This can provide favorable conditions for making the combined force of the force exerted by the first composite pole sheet, the second composite pole sheet, the third composite pole sheet and the fourth composite pole sheet on the winding needle and the total gravity of the winding needle and the coil basically zero, thereby facilitating the arrangement of the first composite mechanism, the second composite mechanism, the third composite mechanism and the fourth composite mechanism.

[0033] In a second aspect, the present application provides a battery manufacturing device, including a housing and the above-mentioned electrode assembly manufacturing device.

[0034] In a third aspect, the present application provides a method for manufacturing an electrode assembly, comprising:

[0035] Provide winding needle and multiple unwinding devices;

[0036] Providing a plurality of coils to the coiling needles via a plurality of unwinding devices; and

[0037] Winding a plurality of coils onto a winding needle to form an electrode assembly;

[0038] Among them, during the winding process, the combined force of the multiple forces exerted by the multiple coils on the winding needle, the gravity of the coils wound on the winding needle and the gravity of the winding needle is substantially zero.

[0039] In a fourth aspect, the present application provides a battery manufacturing method, including the above-mentioned electrode assembly manufacturing method.

[0040] 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

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 paying creative work.

[0042] Figure 1 It is a structural schematic diagram of the first embodiment of the electrode assembly manufacturing device provided in the present application.

[0043] Figure 2 It is a structural schematic diagram of the second embodiment of the electrode assembly manufacturing device provided in this application.

[0044] Figure 3It is a structural schematic diagram of the third embodiment of the electrode assembly manufacturing device provided in the present application.

[0045] Figure 4 It is a schematic diagram of the force on the winding needle in the third embodiment of the electrode assembly manufacturing device provided in the present application.

[0046] Figure 5 It is a structural schematic diagram of the fourth embodiment of the electrode assembly manufacturing device provided in the present application.

[0047] Figure 6 It is a comparative schematic diagram of the fourth embodiment of the electrode assembly manufacturing device provided in the present application before and after adjustment.

[0048] Figure 7 It is a structural schematic diagram of the fifth embodiment of the electrode assembly manufacturing device provided in the present application.

[0049] Figure 8 This is a schematic diagram of the forces acting on the winding needle in the fifth embodiment of the electrode assembly manufacturing device provided in the present application.

[0050] Fig. 9 It is a structural schematic diagram of the sixth embodiment of the electrode assembly manufacturing device provided in the present application.

[0051] Fig.10 It is a comparative schematic diagram of the sixth embodiment of the electrode assembly manufacturing device provided in the present application before and after adjustment.

[0052] Fig.11 It is a structural schematic diagram of the seventh embodiment of the electrode assembly manufacturing device provided in the present application.

[0053] Fig.12 This is a schematic diagram of the forces acting on the winding needle in the seventh embodiment of the electrode assembly manufacturing device provided in the present application.

[0054] Fig.13 It is a structural schematic diagram of the eighth embodiment of the electrode assembly manufacturing device provided in the present application.

[0055] Fig.14 It is a comparative schematic diagram of the eighth embodiment of the electrode assembly manufacturing device provided in the present application before and after adjustment.

[0056] Fig.15 It is a structural schematic diagram of the ninth embodiment of the electrode assembly manufacturing device provided in the present application.

[0057] Fig.16 This is a schematic diagram of the forces acting on the winding needle in the ninth embodiment of the electrode assembly manufacturing device provided in the present application.

[0058] Fig.17 It is a structural schematic diagram of the tenth embodiment of the electrode assembly manufacturing device provided in the present application.

[0059] Fig.18 It is a comparative schematic diagram of the tenth embodiment of the electrode assembly manufacturing device provided in the present application before and after adjustment.

[0060] Fig.19 It is a structural schematic diagram of the adjustment mechanism in the electrode assembly manufacturing device provided in the present application.

[0061] Fig. 20 A cross-sectional view of an electrode assembly manufactured using some embodiments of the electrode assembly manufacturing apparatus provided in the present application.

[0062] Fig.21 A cross-sectional view of another electrode assembly manufactured using some embodiments of the electrode assembly manufacturing apparatus provided in the present application.

[0063] In the drawings, the drawings are not drawn to scale.

[0064] The markings are as follows:

[0065] 1. Winding needle; 2. Unwinding device; 21. First unwinding device; 22. Second unwinding device; 23. Third unwinding device; 24. Fourth unwinding device; 25. Fifth unwinding device; 26. Sixth unwinding device; 27. Seventh unwinding device; 28. Eighth unwinding device; 3. Coil; 31. First pole piece; 32. Second pole piece; 33. First isolation film; 34. Second isolation film; 35. Third pole piece; 36. Fourth pole piece; 37. Third isolation film; 38. Fourth isolation film; 4. Electrode assembly; 5. Adjustment mechanism; 51. First adjustment mechanism; 52. Second adjustment mechanism; 53. Third adjustment mechanism; 54. Fourth adjustment mechanism; 501. Driving member; 502. Connecting member; 503. Contact head; 6. Detection device; 7. Composite mechanism; 71. First composite mechanism; 72. Second composite mechanism; 73. Third composite mechanism; 74. Fourth composite mechanism; 8. Composite pole piece; 81. First composite pole piece; 82. Second composite pole piece; 83. Third composite pole piece; 84. Fourth composite pole piece. DETAILED DESCRIPTION

[0066] 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.

[0067] 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.

[0068] 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 addition, the term "perpendicular" does not mean perpendicular in the strict sense, but is within the allowable error range. "Parallel" does not mean parallel in the strict sense, but is within the allowable error range.

[0069] 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.

[0070] 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.

[0071] In the description of the embodiments of the present application, the term "multiple" refers to more than two, unless otherwise clearly defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise clearly defined.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] As batteries are used more and more widely, the quality requirements for batteries are becoming more and more stringent. In order to ensure the quality of finished batteries, it is necessary to strictly control the manufacturing quality during the manufacturing process.

[0076] The battery includes an electrode assembly, which is wound by multiple layers of pole sheets. During the winding process, the winding needle will be affected by the tension of the pole sheet. Under the tension of the pole sheet, if the rigidity is insufficient, the winding needle will bend and deform, resulting in a large deflection, which will lead to wrinkles during winding and poor alignment of the diaphragm. This will affect the quality of the electrode assembly and the overall quality of the battery, and will also affect the winding efficiency and reduce the manufacturing efficiency of the battery. If the diameter of the winding needle is increased in order to increase the rigidity of the winding needle, the volume of the electrode assembly will increase, the energy density of the electrode assembly will decrease, and the capacity of the battery will decrease.

[0077] Based on the above considerations, the present application improves the structure of the electrode assembly manufacturing device.

[0078] In the embodiment of the electrode assembly manufacturing device provided in the present application, the electrode assembly manufacturing device includes a winding needle and a plurality of unwinding devices for providing a plurality of coils to the winding needle. The plurality of unwinding devices are configured to make the combined force of the plurality of forces exerted by the coils on the winding needle, the gravity of the coils wound on the winding needle, and the gravity of the winding needle substantially zero during the winding process. By modifying the plurality of unwinding devices, the bending deformation of the winding needle can be reduced, thereby avoiding problems such as wrinkling and poor alignment of the membrane during winding, thereby effectively improving the quality of the electrode assembly and the overall quality of the battery, and also helping to improve the winding efficiency, thereby improving the manufacturing efficiency of the battery.

[0079] Based on the electrode assembly manufacturing device provided in the present application, the present application also provides a battery manufacturing device, which includes the above-mentioned electrode assembly manufacturing device.

[0080] The present application also provides a method for manufacturing an electrode assembly, the method comprising:

[0081] Provide winding needle and multiple unwinding devices;

[0082] Providing a plurality of coils to the coiling needles via a plurality of unwinding devices; and

[0083] Winding a plurality of coils onto a winding needle to form an electrode assembly;

[0084] Among them, during the winding process, the combined force of the multiple forces exerted by the multiple coils on the winding needle, the gravity of the coils wound on the winding needle and the gravity of the winding needle is substantially zero.

[0085] When manufacturing an electrode assembly through the electrode assembly manufacturing method embodiment provided in the present application, during the winding process, the multiple forces generated by multiple coils on the winding needle, the gravity of the coils wound on the winding needle and the gravity of the winding needle are basically zero. Therefore, during winding, problems such as wrinkling and poor alignment of the membrane can be effectively avoided, thereby effectively improving the quality of the electrode assembly and the overall quality of the battery, and can also improve the winding efficiency, thereby improving the manufacturing efficiency of the electrode assembly and the battery.

[0086] Based on the electrode assembly manufacturing method provided in the present application, the present application also provides a battery manufacturing method, which includes the above-mentioned electrode assembly manufacturing method.

[0087] The following is an introduction to an embodiment of the electrode assembly manufacturing device provided in the present application.

[0088] Reference Figure 1 As shown, in some embodiments of the electrode assembly manufacturing device provided in the present application, the electrode assembly manufacturing device includes a winding needle 1 and a plurality of unwinding devices 2, the plurality of unwinding devices 2 are configured to provide a plurality of coils 3 to the winding needle 1, the plurality of coils 3 are wound onto the winding needle 1 to form an electrode assembly 4, during the winding process, the plurality of coils 3 generate a plurality of forces on the winding needle 1, and the relative positions of the plurality of unwinding devices 2 are constructed so that the resultant force of the plurality of forces, the gravity of the coils 3 wound on the winding needle 1 and the gravity of the winding needle is substantially zero.

[0089] The unwinding device 2 releases the coil 3 from the reel, and needs to keep the coil 3 soft to prevent damage or deformation, and also needs to keep the coil 3 flat and tight so that the coil 3 can be subsequently wound onto the winding needle 1. Therefore, the unwinding device 2 needs to control the surface tension of the coil 3 when unwinding to prevent it from loosening or curling, and the surface tension will form a pulling force on the winding needle 1. Multiple unwinding devices 2 form pulling forces in different directions on the winding needle 1, so that when the winding needle 1 is not rigid enough, it may cause the winding needle 1 to bend and deform.

[0090] By modifying the relative positions of the multiple unwinding devices 2, the multiple forces generated by the multiple coils 3 on the winding needle 1, the combined force of the gravity of the coils 3 wound on the winding needle 1 and the gravity of the winding needle 1 are basically zero, which can minimize the bending deformation of the winding needle 1, thereby avoiding problems such as wrinkling and poor alignment of the membrane during winding, thereby effectively improving the quality of the electrode assembly 4 and the overall quality of the battery; it can also avoid rework due to problems such as wrinkling and poor alignment of the membrane, thereby improving the winding efficiency, and then improving the manufacturing efficiency of the electrode assembly 4 and the battery.

[0091] The electrode assembly manufacturing device embodiment provided in the present application does not need to increase the diameter of the winding needle 1 , and thus can effectively control the volume of the electrode assembly 4 and improve the energy density of the electrode assembly 4 .

[0092] In the embodiment of the electrode assembly manufacturing device provided in the present application, the coil 3 provided by the unwinding device 2 may include an electrode sheet or a separator.

[0093] In some embodiments, each unwinding device 2 provides one roll material 3. In other embodiments, each unwinding device 2 provides a composite roll material including multiple roll materials 3.

[0094] In some embodiments, the electrode assembly manufacturing apparatus further includes an adjusting mechanism 5, which is configured to adjust the position of at least one of the plurality of coils 3 relative to the winding needle 1 to adjust the winding angle of the coil 3. The winding angle of the coil 3 refers to the angle between the extension direction of the coil 3 and the horizontal plane.

[0095] By setting the adjustment mechanism 5, the position of the coil 3 can be adjusted as needed, thereby adjusting the winding angle of the coil 3, that is, adjusting the direction of the pulling force on the coil 3 exerted on the winding needle 1, thereby providing conditions for adjusting the resultant force exerted on the winding needle 1.

[0096] By setting the adjustment mechanism 5, the electrode assembly manufacturing device can be compatible with products of different specifications and the winding needle 1, and the compatibility of the winding needle force offset winding can be improved. In addition, the bending deformation of the winding needle 1 can be effectively reduced, and the problems of wrinkling and poor film alignment during winding can be avoided, and the winding efficiency can also be improved.

[0097] In some embodiments, the adjustment mechanism 5 is configured to adjust the position of at least one of the plurality of coils 3 relative to the winding needle 1 in real time during the winding process, so as to adjust the winding angle of the coil 3 in real time.

[0098] In the above embodiment, the adjustment mechanism 5 can adjust the winding angle of the coil 3 in real time, so that the resultant force of the forces exerted on the winding needle 1 from the multiple unwinding devices 2 can change with the gravity change of the coil 3 that is constantly increasing on the winding needle 1, thereby achieving the purpose of adapting to the gravity change of the winding needle 1, and always maintaining the size of the resultant force exerted on the winding needle 1 so as not to cause the winding needle 1 to bend and deform, so as to achieve dynamic compensation of the forces exerted on the winding needle during the entire winding process, further effectively ensuring the straightness of the winding needle 1, and avoiding problems such as wrinkling and poor alignment of the diaphragm.

[0099] There are many options for the specific structural form of the adjustment mechanism 5.

[0100] In some embodiments, the adjustment mechanism 5 includes a driving member 501, a connecting member 502 and a contact head 503, wherein the connecting member 502 connects the driving member 501 and the contact head 503, and the driving member 501 is configured to drive the coil 3 to move relative to the winding needle 1 to adjust the winding angle of the coil 3.

[0101] The driving member 501 may be a driving element such as a motor, a cylinder or a pneumatic cylinder. The connecting member 502 may be a hard member such as a connecting rod. The contact head 503 may be in a spherical shape to reduce scratches on the coil 3 and effectively protect the coil 3.

[0102] In some other embodiments, the adjustment mechanism 5 can also be configured to adjust the position of the unwinding device 2 relative to the winding needle 1, so as to indirectly adjust the winding angle of the coil 3 by adjusting the position of the unwinding device 2 relative to the winding needle 1.

[0103] In some embodiments, the electrode assembly manufacturing device also includes a detection device 6, which is configured to detect the weight or length of the coil 3 wound on the winding needle 1 during the winding process. The detection device 6 is connected to the adjustment mechanism 5 by signal so that the adjustment mechanism 5 adjusts the position of at least one of the multiple unwinding devices 2 relative to the winding needle 1 according to the detection result of the detection device 6.

[0104] By providing the detection device 6 , the weight change of the winding needle 1 can be detected at any time, providing an adjustment basis for the adjustment mechanism 5 .

[0105] The detection device 6 can directly measure the total weight of the winding needle 1 and the coil 3 on the winding needle 1. The detection device 6 can also first measure the weight of the coil 3 on the winding needle 1, and then add the weight of the winding needle 1 itself to obtain the real-time weight of the winding needle 1.

[0106] The detection device 6 may be an electronic scale or a weight sensor that can directly measure the weight of the winding needle 1, or a measuring device that measures the number of windings of the coil 3 and then calculates the weight of the winding needle 1 based on the number of windings.

[0107] Since the weight of the coil 3 per unit length is a known quantity, the weight change of the winding needle 1 can also be obtained by measuring the length of the coil 3 , thereby providing an adjustment basis for the adjustment mechanism 5 .

[0108] In some embodiments, the plurality of unwinding devices 2 include a first unwinding device 21 for providing a first pole piece 31 to the winding needle 1, a second unwinding device 22 for providing a second pole piece 32 to the winding needle 1, a third unwinding device 23 for providing a first isolation film 33 to the winding needle 1, and a fourth unwinding device 24 for providing a second isolation film 34 to the winding needle 1. The polarity of the first pole piece 31 is opposite to that of the second pole piece 32.

[0109] In the above embodiment, the electrode assembly 4 includes a double-layer electrode sheet and a double-layer isolation membrane.

[0110] In some embodiments, the angle between the rolling direction of the first pole piece 31 and the rolling direction of the second pole piece 32 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.; and / or, the angle between the rolling direction of the first isolation membrane 33 and the rolling direction of the second isolation membrane 34 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.

[0111] The angle between the winding direction of the first pole piece 31 and the winding direction of the second pole piece 32 and the angle between the winding direction of the first isolation membrane 33 and the winding direction of the second isolation membrane 34 are both set to be greater than or equal to 60° and less than or equal to 180°. This can provide favorable conditions for making the combined force of the force generated by the first pole piece 31, the second pole piece 32, the first isolation membrane 33 and the second isolation membrane 34 on the winding needle 1 and the total gravity of the winding needle 1 and the coil 3 basically zero, thereby facilitating the arrangement of the first unwinding device 21, the second unwinding device 22, the third unwinding device 23 and the fourth unwinding device 24.

[0112] In some embodiments, the angle between the rolling direction of the first pole piece 31 and the rolling direction of the first isolation membrane 33 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.; and / or the angle between the rolling direction of the second pole piece 32 and the rolling direction of the second isolation membrane 34 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.

[0113] In some embodiments, the electrode assembly manufacturing device also includes a first composite structure 71 and a second composite structure 72. The first composite structure 71 is configured to composite the first electrode sheet 31 and the first isolation film 33 into a first composite electrode sheet 81 before winding, and the second composite structure 72 is configured to composite the second electrode sheet 32 ​​and the second isolation film 34 into a second composite electrode sheet 82 before winding. The angle between the winding direction of the first composite electrode sheet 81 and the winding direction of the second composite electrode sheet 82 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.

[0114] The first electrode piece 31 and the first isolation film 33 are firstly combined into a first composite electrode piece 81 by the first combination mechanism 71 , and the second electrode piece 32 and the second isolation film 34 are firstly combined into a second composite electrode piece 82 by the second combination mechanism 72 , which can effectively improve the winding efficiency.

[0115] Setting the angle between the winding direction of the first composite pole piece 81 and the winding direction of the second composite pole piece 82 to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force generated by the first composite pole piece 81 and the second composite pole piece 82 on the winding needle 1 and the total gravity of the winding needle 1 and the coil 3 basically zero, thereby facilitating the arrangement of the first composite structure 71 and the second composite structure 72.

[0116] In some embodiments, the multiple unwinding devices 2 also include a fifth unwinding device 25 for providing a third pole piece 35 to the winding needle 1, a sixth unwinding device 26 for providing a fourth pole piece 36 to the winding needle 1, a seventh unwinding device 27 for providing a third isolation film 37 to the winding needle 1, and an eighth unwinding device 28 for providing a fourth isolation film 38 to the winding needle 1, and the polarity of the third pole piece 35 is opposite to that of the fourth pole piece 36.

[0117] In the above embodiment, the electrode assembly 4 includes four layers of electrode sheets and four layers of isolation films.

[0118] In some embodiments, the angle between the rolling direction of the third pole piece 35 and the rolling direction of the fourth pole piece 36 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.; and / or, the angle between the rolling direction of the third isolation film 37 and the rolling direction of the fourth isolation film 38 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.

[0119] The angle between the winding direction of the third pole piece 35 and the winding direction of the fourth pole piece 36, and the angle between the winding direction of the third isolation membrane 37 and the winding direction of the fourth isolation membrane 38 are both set to be greater than or equal to 60° and less than or equal to 180°. This can provide favorable conditions for making the combined force of the force generated by the third pole piece 35, the fourth pole piece 36, the third isolation membrane 37 and the fourth isolation membrane 38 on the winding needle 1 and the total gravity of the winding needle 1 and the coil 3 basically zero, and facilitate the arrangement of the fifth unwinding device 25, the sixth unwinding device 26, the seventh unwinding device 27 and the eighth unwinding device 28.

[0120] In some embodiments, the angle between the rolling direction of the third pole piece 35 and the rolling direction of the third isolation membrane 37 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.; and / or the angle between the rolling direction of the fourth pole piece 36 and the rolling direction of the fourth isolation membrane 38 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70° or 180°, etc.

[0121] In some embodiments, the angle between the rolling direction of the first pole piece 31 and the rolling direction of the third pole piece 35 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70° or 180°, etc.; and / or the angle between the rolling direction of the second pole piece 32 and the rolling direction of the fourth pole piece 36 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.

[0122] In some embodiments, the angle between the rolling direction of the first isolation film 33 and the rolling direction of the third isolation film 37 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.; and / or the angle between the rolling direction of the second isolation film 34 and the rolling direction of the fourth isolation film 38 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.

[0123] In some embodiments, the electrode assembly manufacturing device also includes a third composite structure 73 and a fourth composite structure 74. The third composite structure 73 is configured to composite the third electrode sheet 35 and the third isolation film 37 into a third composite electrode sheet 83 before winding. The fourth composite structure 74 is configured to composite the fourth electrode sheet 36 and the fourth isolation film 38 into a fourth composite electrode sheet 84 before winding. The angle between the winding direction of the third composite electrode sheet 83 and the winding direction of the fourth composite electrode sheet 84 is greater than or equal to 60° and less than or equal to 180°, such as 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc.

[0124] The third electrode piece 35 and the third isolation film 37 are firstly combined into a third composite electrode piece 83 by the third composite mechanism 73 , and the fourth electrode piece 36 and the fourth isolation film 38 are firstly combined into a fourth composite electrode piece 84 by the fourth composite mechanism 74 , which can effectively improve the winding efficiency.

[0125] Setting the angle between the winding direction of the third composite pole piece 83 and the winding direction of the fourth composite pole piece 84 to be greater than or equal to 60° and less than or equal to 180° can provide favorable conditions for making the combined force of the force generated by the third composite pole piece 83 and the fourth composite pole piece 84 on the winding needle 1 and the total gravity of the winding needle 1 and the coil 3 basically zero, thereby facilitating the arrangement of the third composite mechanism 73 and the fourth composite mechanism 74.

[0126] In some embodiments, the angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the third composite pole piece 83 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.; and / or the angle between the rolling direction of the second composite pole piece 82 and the rolling direction of the fourth composite pole piece 84 is not greater than 180°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 90°, 100°, 120°, 150° or 180°, etc.

[0127] The angle between the winding direction of the first composite pole piece 81 and the winding direction of the third composite pole piece 83 and the angle between the winding direction of the second composite pole piece 82 and the winding direction of the fourth composite pole piece 84 are both set to be no greater than 180°. This can provide favorable conditions for making the combined force of the force generated by the first composite pole piece 81, the second composite pole piece 82, the third composite pole piece 83 and the fourth composite pole piece 84 on the winding needle 1 and the total gravity of the winding needle 1 and the coil 3 basically zero, thereby facilitating the arrangement of the first composite mechanism 71, the second composite mechanism 72, the third composite mechanism 73 and the fourth composite mechanism 74.

[0128] In other embodiments, the electrode assembly 4 may include six or more layers of electrode sheets and separators.

[0129] In the embodiment of the present application, multiple coils 3 are wound synchronously, which can effectively improve the winding efficiency.

[0130] The following is combined with Figures 1 to 21 The structures of some embodiments of the electrode assembly manufacturing device provided in this application are introduced.

[0131] like Figure 1 As shown, in the first embodiment, the electrode assembly manufacturing device includes a winding needle 1 and four unwinding devices 2 for providing a coil 3 to the winding needle 1 .

[0132] The four unwinding devices 2 are respectively a first unwinding device 21, a second unwinding device 22, a third unwinding device 23 and a fourth unwinding device 24. The first unwinding device 21 provides a first pole piece 31 to the winding needle 1, the second unwinding device 22 provides a second pole piece 32 to the winding needle 1, the third unwinding device 23 provides a first isolation film 33 to the winding needle 1, and the fourth unwinding device 24 provides a second isolation film 34 to the winding needle 1.

[0133] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the second pole piece 32 is approximately 180°. The angle between the rolling direction of the first isolation film 33 and the rolling direction of the second isolation film 34 is approximately 180°.

[0134] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the first isolation film 33 is approximately 15°. The angle between the rolling direction of the second pole piece 32 and the rolling direction of the second isolation film 34 is approximately 15°.

[0135] During winding, the first pole piece 31 and the first isolation film 33 are located on one side of the winding needle 1, and the second pole piece 32 and the second isolation film 34 are located on the other side of the winding needle 1. When the winding needle 1 rotates, the first pole piece 31, the first isolation film 33, the second pole piece 32 and the second isolation film 34 are synchronously wound on the winding needle 1 to form an electrode assembly 4.

[0136] The combined force of the force of the first pole piece 31 on the winding needle 1, the force of the second pole piece 32 on the winding needle 1, the force of the first isolation film 33 on the winding needle 1, and the force of the second isolation film 34 on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and realizing "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby realizing an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0137] like Figure 2 As shown, in the second embodiment, the electrode assembly manufacturing device includes a winding needle 1, four unwinding devices 2 for providing a coil 3 to the winding needle 1, and two composite mechanisms 7 for providing a composite electrode sheet 8.

[0138] The four unwinding devices 2 are respectively the first unwinding device 21, the second unwinding device 22, the third unwinding device 23 and the fourth unwinding device 24. The first unwinding device 21 provides the first pole piece 31 to the winding needle 1, the second unwinding device 22 provides the second pole piece 32 to the winding needle 1, the third unwinding device 23 provides the first isolation film 33 to the winding needle 1, and the fourth unwinding device 24 provides the second isolation film 34 to the winding needle 1. The two composite mechanisms 7 are respectively the first composite mechanism 71 and the second composite mechanism 72. The first composite mechanism 71 composites the first pole piece 31 and the first isolation film 33 into a first composite pole piece 81, and the second composite mechanism 72 composites the second pole piece 32 and the second isolation film 34 into a second composite pole piece 82.

[0139] The angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the second composite pole piece 82 is approximately 180°.

[0140] The rolling directions of the first pole piece 31, the first isolation film 33, the second pole piece 32 and the second isolation film 34 can be flexibly set as needed. In this embodiment, the angle between the rolling directions of the first pole piece 31 and the first isolation film 33 entering the first composite structure 71 is approximately 20°. The angle between the rolling directions of the second pole piece 32 and the second isolation film 34 entering the second composite structure 72 is approximately 20°.

[0141] During winding, the first composite electrode sheet 81 is located on one side of the winding needle 1, and the second composite electrode sheet 82 is located on the other side of the winding needle 1. When the winding needle 1 rotates, the first composite electrode sheet 81 and the second composite electrode sheet 82 are synchronously wound on the winding needle 1 to form the electrode assembly 4.

[0142] The combined force of the force exerted by the first composite pole piece 81 on the winding needle 1, the combined force of the force exerted by the second composite pole piece 82 on the winding needle 1, and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force applied to the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and achieving "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby achieving an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0143] like Figure 3 As shown, in the third embodiment, the electrode assembly manufacturing device includes a winding needle 1 and four unwinding devices 2 (not shown in the figure) for providing the coil 3 to the winding needle 1.

[0144] The four unwinding devices 2 provide the first pole piece 31 , the second pole piece 32 , the first isolation film 33 and the second isolation film 34 to the winding needle 1 respectively.

[0145] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the second pole piece 32 is approximately 180°. The angle between the rolling direction of the first isolation film 33 and the rolling direction of the second isolation film 34 is approximately 180°.

[0146] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the first isolation film 33 is approximately 20°. The angle between the rolling direction of the second pole piece 32 and the rolling direction of the second isolation film 34 is approximately 20°.

[0147] During winding, the first pole piece 31 and the first isolation film 33 are located on one side of the winding needle 1, and the second pole piece 32 and the second isolation film 34 are located on the other side of the winding needle 1. When the winding needle 1 rotates, the first pole piece 31, the first isolation film 33, the second pole piece 32 and the second isolation film 34 are synchronously wound on the winding needle 1 to form an electrode assembly 4.

[0148] like Figure 4 As shown, the combined force of the force F1 exerted by the first pole piece 31 on the winding needle 1, the force F2 exerted by the second pole piece 32 on the winding needle 1, the force F3 exerted by the first isolation film 33 on the winding needle 1, the force F4 exerted by the second isolation film 34 on the winding needle 1, and the combined force Fg of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force exerted on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1, realizing “zero” deflection deformation winding of the winding needle 1, and effectively controlling the diameter of the winding needle 1, thereby realizing an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0149] like Figure 5As shown, in the fourth embodiment, compared with the third embodiment, the fourth embodiment adds an adjustment mechanism 5 and a detection device 6. At the same time, four unwinding devices 2 are shown in the figure, namely a first unwinding device 21, a second unwinding device 22, a third unwinding device 23 and a fourth unwinding device 24.

[0150] The first unwinding device 21 provides the first pole piece 31 to the winding needle 1 , the second unwinding device 22 provides the second pole piece 32 to the winding needle 1 , the third unwinding device 23 provides the first isolation film 33 to the winding needle 1 , and the fourth unwinding device 24 provides the second isolation film 34 to the winding needle 1 .

[0151] The number of the adjusting mechanisms 5 can be flexibly set as needed. For example, one adjusting mechanism 5 can be configured for each coil 3. The number of the adjusting mechanisms 5 can be more than the number of the coils 3, or less than the number of the coils 3. Each coil 3 has its roll-in angle adjusted by one or more adjusting mechanisms 5.

[0152] In the fourth embodiment, the adjustment mechanism 5 includes a first adjustment mechanism 51 and a second adjustment mechanism 52. The first adjustment mechanism 51 is used to adjust the winding angle of the first pole piece 31 and the first isolation film 33, and the second adjustment mechanism 52 is used to adjust the winding angle of the second pole piece 32 and the second isolation film 34. The detection device 6 is used to detect the gravity of the coil 3 wound on the winding needle 1. The detection device 6 is connected to the first adjustment mechanism 51 and the second adjustment mechanism 52 by signal, so that the first adjustment mechanism 51 and the second adjustment mechanism 52 respectively adjust the winding angles of the first pole piece 31, the second pole piece 32, the first isolation film 33 and the second isolation film 34 according to the detection result of the detection device 6.

[0153] like Figure 6 , which is a comparison diagram before and after the fourth embodiment adjusts the rolling angles of the first pole piece 31 , the second pole piece 32 , the first isolation film 33 and the second isolation film 34 by the adjustment mechanism 5 .

[0154] It can be seen from the figure that before adjustment, the angle between the rolling directions of the first pole piece 31 and the first isolation membrane 33 is approximately 20°, and after adjustment by the first adjustment mechanism 51, the first pole piece 31 and the first isolation membrane 33 are basically fitted together to form a first combined pole piece before rolling; before adjustment, the angle between the rolling directions of the second pole piece 32 and the second isolation membrane 34 is approximately 20°, and after adjustment by the second adjustment mechanism 52, the second pole piece 32 and the second isolation membrane 34 are basically fitted together to form a second combined pole piece before rolling.

[0155] After adjustment, the combined force of the force of the first combined pole piece on the winding needle 1 and the force of the second combined pole piece on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and achieving "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby achieving an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0156] like Figure 7 As shown, in the fifth embodiment, the electrode assembly manufacturing device includes a winding needle 1, four unwinding devices 2 (not shown in the figure) for providing a coil 3 to the winding needle 1, and two composite mechanisms 7 for providing a composite electrode sheet 8.

[0157] The four unwinding devices 2 respectively provide the first pole piece 31, the second pole piece 32, the first isolation film 33 and the second isolation film 34 to the winding needle 1. The two composite mechanisms 7 are respectively the first composite mechanism 71 and the second composite mechanism 72. The first composite mechanism 71 composites the first pole piece 31 and the first isolation film 33 into a first composite pole piece 81, and the second composite mechanism 72 composites the second pole piece 32 and the second isolation film 34 into a second composite pole piece 82.

[0158] The angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the second composite pole piece 82 is approximately 180°.

[0159] The rolling directions of the first pole piece 31, the first isolation film 33, the second pole piece 32 and the second isolation film 34 can be flexibly set as needed. In this embodiment, the angle between the rolling directions of the first pole piece 31 and the first isolation film 33 entering the first composite structure 71 is approximately 60°. The angle between the rolling directions of the second pole piece 32 and the second isolation film 34 entering the second composite structure 72 is approximately 60°.

[0160] During winding, the first composite electrode sheet 81 is located on one side of the winding needle 1, and the second composite electrode sheet 82 is located on the other side of the winding needle 1. When the winding needle 1 rotates, the first composite electrode sheet 81 and the second composite electrode sheet 82 are synchronously wound on the winding needle 1 to form the electrode assembly 4.

[0161] like Figure 8 As shown, the combined force F5 of the first composite pole piece 81 on the winding needle 1, the force F6 of the second composite pole piece 82 on the winding needle 1, and the combined force Fg of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1, achieving "zero" deflection deformation winding of the winding needle 1, and effectively controlling the diameter of the winding needle 1, thereby achieving an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0162] like Fig. 9 As shown, in the sixth embodiment, the electrode assembly manufacturing device includes a winding needle 1, four unwinding devices 2 (not shown in the figure) for providing the coil 3 to the winding needle 1, an adjusting mechanism 5, a detection device 6 (not shown in the figure) and two composite mechanisms 7 for providing composite pole pieces 8.

[0163] The four unwinding devices 2 respectively provide the first pole piece 31, the second pole piece 32, the first isolation film 33 and the second isolation film 34 to the winding needle 1. The two composite mechanisms 7 are respectively the first composite mechanism 71 and the second composite mechanism 72. The first composite mechanism 71 composites the first pole piece 31 and the first isolation film 33 into a first composite pole piece 81, and the second composite mechanism 72 composites the second pole piece 32 and the second isolation film 34 into a second composite pole piece 82.

[0164] The angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the second composite pole piece 82 is approximately 180°.

[0165] The rolling directions of the first pole piece 31, the first isolation film 33, the second pole piece 32 and the second isolation film 34 can be flexibly set as needed. In this embodiment, the angle between the rolling directions of the first pole piece 31 and the first isolation film 33 entering the first composite structure 71 is approximately 60°. The angle between the rolling directions of the second pole piece 32 and the second isolation film 34 entering the second composite structure 72 is approximately 60°.

[0166] The number of the adjusting mechanisms 5 can be flexibly set as needed. For example, one adjusting mechanism 5 can be configured for each coil 3. The number of the adjusting mechanisms 5 can be more than the number of the coils 3, or less than the number of the coils 3. Each coil 3 has its roll-in angle adjusted by one or more adjusting mechanisms 5.

[0167] In this embodiment, the adjustment mechanism 5 includes a first adjustment mechanism 51 and a second adjustment mechanism 52. The first adjustment mechanism 51 is used to adjust the winding angle of the first composite electrode piece 81, and the second adjustment mechanism 52 is used to adjust the winding angle of the second composite electrode piece 82. The detection device 6 is used to detect the gravity of the coil 3 wound on the winding needle 1. The detection device 6 is connected to the first adjustment mechanism 51 and the second adjustment mechanism 52 by signal, so that the first adjustment mechanism 51 and the second adjustment mechanism 52 respectively adjust the winding angles of the first composite electrode piece 81 and the second composite electrode piece 82 according to the detection result of the detection device 6.

[0168] During winding, the first composite electrode sheet 81 is located on one side of the winding needle 1, and the second composite electrode sheet 82 is located on the other side of the winding needle 1. When the winding needle 1 rotates, the first composite electrode sheet 81 and the second composite electrode sheet 82 are synchronously wound on the winding needle 1 to form the electrode assembly 4.

[0169] Before or during winding, the first adjustment mechanism 51 and the second adjustment mechanism 52 respectively adjust the winding angles of the first composite electrode sheet 81 and the second composite electrode sheet 82 according to the detection results of the detection device 6, so that the combined force of the force of the first composite electrode sheet 81 on the winding needle 1, the combined force of the force of the second composite electrode sheet 82 on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1, realizing "zero" deflection deformation winding of the winding needle 1, and can effectively control the diameter of the winding needle 1, thereby realizing the improvement of the energy density of the electrode assembly 4 and the significant improvement of the winding efficiency.

[0170] like Fig.10 , which is a comparison diagram before and after the sixth embodiment adjusts the rolling angles of the first composite pole piece 81 and the second composite pole piece 82 by the first adjustment mechanism 51 and the second adjustment mechanism 52 respectively.

[0171] It can be seen from the figure that before adjustment, the rolling angle of the first composite pole piece 81 is basically 0°, and after adjustment by the first adjustment mechanism 51, the rolling angle of the first composite pole piece 81 changes to approximately 30°; before adjustment, the rolling angle of the second composite pole piece 82 is basically 0°, and after adjustment by the second adjustment mechanism 52, the rolling angle of the second composite pole piece 82 changes to approximately 30°, and the angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the second composite pole piece 82 is approximately 180°.

[0172] After adjustment, the combined force of the force of the first composite pole piece 81 on the winding needle 1 and the force of the second composite pole piece 82 on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and achieving "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby achieving an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0173] In such Figures 1 to 10 In the embodiments 1 to 6 shown, the electrode assembly 4 is formed by winding two layers of electrode sheets and two layers of isolation films. Figures 11 to 18 The seventh to tenth embodiments shown introduce the winding method of the electrode assembly 4 formed by winding four layers of electrode sheets and four layers of isolation films.

[0174] like Fig.11 As shown, in the seventh embodiment, the electrode assembly manufacturing device includes a winding needle 1 and eight unwinding devices 2 for providing a coil 3 to the winding needle 1 .

[0175] The eight unwinding devices 2 include a first unwinding device 21, a second unwinding device 22, a third unwinding device 23, a fourth unwinding device 24, a fifth unwinding device 25, a sixth unwinding device 26, a seventh unwinding device 27 and an eighth unwinding device 28. The first unwinding device 21 provides a first pole piece 31 to the winding needle 1, the second unwinding device 22 provides a second pole piece 32 to the winding needle 1, the third unwinding device 23 provides a first isolation film 33 to the winding needle 1, and the fourth unwinding device 24 provides a second isolation film 34 to the winding needle 1. The fifth unwinding device 25 provides a third pole piece 35 to the winding needle 1, the sixth unwinding device 26 provides a fourth pole piece 36 to the winding needle 1, the seventh unwinding device 27 provides a third isolation film 37 to the winding needle 1, and the eighth unwinding device 28 provides a fourth isolation film 38 to the winding needle 1.

[0176] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the second pole piece 32 is approximately 180°. The angle between the rolling direction of the first isolation film 33 and the rolling direction of the second isolation film 34 is approximately 180°. The angle between the rolling direction of the third pole piece 35 and the rolling direction of the fourth pole piece 36 is approximately 180°. The angle between the rolling direction of the third isolation film 37 and the rolling direction of the fourth isolation film 38 is approximately 180°.

[0177] The angle between the rolling direction of the first pole piece 31 and the rolling direction of the first isolation film 33 is approximately 20°. The angle between the rolling direction of the second pole piece 32 and the rolling direction of the second isolation film 34 is approximately 20°. The angle between the rolling direction of the third pole piece 35 and the rolling direction of the third isolation film 37 is approximately 20°. The angle between the rolling direction of the fourth pole piece 36 and the rolling direction of the fourth isolation film 38 is approximately 20°.

[0178] During winding, the first pole piece 31, the first isolation film 33, the third pole piece 35 and the third isolation film 37 are located on one side of the winding needle 1, and the second pole piece 32, the second isolation film 34, the fourth pole piece 36 and the fourth isolation film 38 are located on the other side of the winding needle 1. When the winding needle 1 rotates, the first pole piece 31, the first isolation film 33, the second pole piece 32, the second isolation film 34, the third pole piece 35, the third isolation film 37, the fourth pole piece 36 and the fourth isolation film 38 are synchronously wound on the winding needle 1 to form the electrode assembly 4.

[0179] like Fig.12As shown, the combined force F1 of the first pole piece 31 on the winding needle 1, the force F2 of the second pole piece 32 on the winding needle 1, the force F3 of the first isolation film 33 on the winding needle 1, the force F4 of the second isolation film 34 on the winding needle 1, the force F7 of the third pole piece 35 on the winding needle 1, the force F8 of the fourth pole piece 36 on the winding needle 1, the force F9 of the third isolation film 37 on the winding needle 1, and the force F10 of the fourth isolation film 38 on the winding needle 1 basically cancel each other out with the combined force Fg of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and realizing "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby realizing the improvement of the energy density of the electrode assembly 4 and the significant improvement of the winding efficiency.

[0180] like Fig.13 As shown, in the eighth embodiment, compared with the seventh embodiment, the eighth embodiment adds four adjustment mechanisms 5.

[0181] The four adjustment mechanisms 5 include a first adjustment mechanism 51, a second adjustment mechanism 52, a third adjustment mechanism 53 and a fourth adjustment mechanism 54. The first adjustment mechanism 51 is used to adjust the roll-in angle of the first pole piece 31, and the second adjustment mechanism 52 is used to adjust the roll-in angle of the second pole piece 32. The third adjustment mechanism 53 is used to adjust the roll-in angle of the third pole piece 35, and the fourth adjustment mechanism 54 is used to adjust the roll-in angle of the fourth pole piece 36.

[0182] This embodiment may also include a detection device 6 (not shown in the figure), which is used to detect the gravity of the coil 3 wound on the winding needle 1. The detection device 6 is signal-connected to the four adjustment mechanisms 5 so that the adjustment mechanisms 5 adjust the winding angles of the first pole piece 31, the second pole piece 32, the third pole piece 35 and the fourth pole piece 36 respectively according to the detection results of the detection device 6.

[0183] like Fig.14 , which is a comparison diagram before and after the eighth embodiment adjusts the rolling angles of the first pole piece 31 , the second pole piece 32 , the third pole piece 35 and the fourth pole piece 36 by the adjustment mechanism 5 .

[0184] It can be seen from the figure that after adjustment, the rolling angles of the first pole piece 31 , the second pole piece 32 , the third pole piece 35 and the fourth pole piece 36 have all changed.

[0185] After adjustment, the combined force of the force of the first pole piece 31 on the winding needle 1, the force of the second pole piece 32 on the winding needle 1, the force of the first isolation film 33 on the winding needle 1, the force of the second isolation film 34 on the winding needle 1, the force of the third pole piece 35 on the winding needle 1, the force of the fourth pole piece 36 on the winding needle 1, the force of the third isolation film 37 on the winding needle 1, and the force of the fourth isolation film 38 on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and realizing "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby achieving an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0186] like Fig.15 As shown, in the ninth embodiment, the electrode assembly manufacturing device includes a winding needle 1, eight unwinding devices 2 for providing a coil 3 to the winding needle 1, and four composite mechanisms 7 for providing composite pole pieces 8.

[0187] The eight unwinding devices 2 include a first unwinding device 21, a second unwinding device 22, a third unwinding device 23, a fourth unwinding device 24, a fifth unwinding device 25, a sixth unwinding device 26, a seventh unwinding device 27 and an eighth unwinding device 28. The first unwinding device 21 provides a first pole piece 31 to the winding needle 1, the second unwinding device 22 provides a second pole piece 32 to the winding needle 1, the third unwinding device 23 provides a first isolation film 33 to the winding needle 1, and the fourth unwinding device 24 provides a second isolation film 34 to the winding needle 1. The fifth unwinding device 25 provides a third pole piece 35 to the winding needle 1, the sixth unwinding device 26 provides a fourth pole piece 36 to the winding needle 1, the seventh unwinding device 27 provides a third isolation film 37 to the winding needle 1, and the eighth unwinding device 28 provides a fourth isolation film 38 to the winding needle 1.

[0188] The four composite structures 7 are respectively a first composite structure 71, a second composite structure 72, a third composite structure 73 and a fourth composite structure 74. The first composite structure 71 composites the first pole piece 31 and the first isolation film 33 into a first composite pole piece 81, and the second composite structure 72 composites the second pole piece 32 and the second isolation film 34 into a second composite pole piece 82. The third composite structure 73 composites the third pole piece 35 and the third isolation film 37 into a third composite pole piece 83, and the fourth composite structure 74 composites the fourth pole piece 36 and the fourth isolation film 38 into a fourth composite pole piece 84.

[0189] The angle between the rolling direction of the first composite pole piece 81 and the rolling direction of the second composite pole piece 82 is approximately 180°. The angle between the rolling direction of the third composite pole piece 83 and the rolling direction of the fourth composite pole piece 84 is approximately 180°.

[0190] The rolling directions of the first pole piece 31, the first isolation membrane 33, the second pole piece 32 and the second isolation membrane 34 can be flexibly set as needed. In this embodiment, the angle between the first pole piece 31 and the first isolation membrane 33 in the rolling direction entering the first composite structure 71 is approximately 30°. The angle between the second pole piece 32 and the second isolation membrane 34 in the rolling direction entering the second composite structure 72 is approximately 30°. The angle between the third pole piece 35 and the third isolation membrane 37 in the rolling direction entering the third composite structure 73 is approximately 30°. The angle between the fourth pole piece 36 and the fourth isolation membrane 38 in the rolling direction entering the fourth composite structure 74 is approximately 30°.

[0191] During winding, the first composite pole piece 81 and the third composite pole piece 83 are located on one side of the winding needle 1, and the second composite pole piece 82 and the fourth composite pole piece 84 are located on the other side of the winding needle 1. When the winding needle 1 rotates, the first composite pole piece 81, the second composite pole piece 82, the third composite pole piece 83 and the fourth composite pole piece 84 are synchronously wound on the winding needle 1 to form the electrode assembly 4.

[0192] like Fig.16 As shown, the combined force F5 of the first composite pole piece 81 on the winding needle 1, the force F6 of the second composite pole piece 82 on the winding needle 1, the force F11 of the third composite pole piece 83 on the winding needle 1, and the force F12 of the fourth composite pole piece 84 on the winding needle 1 and the combined force Fg of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and realizing "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby realizing an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0193] like Fig.17 As shown, in the tenth embodiment, compared with the ninth embodiment, the tenth embodiment adds four adjustment mechanisms 5.

[0194] The four adjustment mechanisms 5 include a first adjustment mechanism 51, a second adjustment mechanism 52, a third adjustment mechanism 53 and a fourth adjustment mechanism 54. The first adjustment mechanism 51 is used to adjust the roll-in angle of the first composite pole piece 81, and the second adjustment mechanism 52 is used to adjust the roll-in angle of the second composite pole piece 82. The third adjustment mechanism 53 is used to adjust the roll-in angle of the third composite pole piece 83, and the fourth adjustment mechanism 54 is used to adjust the roll-in angle of the fourth composite pole piece 84.

[0195] This embodiment may also include a detection device 6 (not shown in the figure), which is used to detect the gravity of the coil 3 wound on the winding needle 1. The detection device 6 is signal-connected to the four adjustment mechanisms 5 so that the adjustment mechanisms 5 can adjust the winding angles of the first composite pole piece 81, the second composite pole piece 82, the third composite pole piece 83 and the fourth composite pole piece 84 respectively according to the detection results of the detection device 6.

[0196] like Fig.18 , which is a comparison diagram before and after the rolling angles of the first composite pole piece 81 , the second composite pole piece 82 , the third composite pole piece 83 and the fourth composite pole piece 84 are adjusted by the adjustment mechanism 5 in the tenth embodiment.

[0197] It can be seen from the figure that after adjustment, the rolling angles of the first composite pole piece 81 , the second composite pole piece 82 , the third composite pole piece 83 and the fourth composite pole piece 84 have all changed.

[0198] After adjustment, the combined force of the first composite pole piece 81 on the winding needle 1, the force of the second composite pole piece 82 on the winding needle 1, the force of the third composite pole piece 83 on the winding needle 1, and the force of the fourth composite pole piece 84 on the winding needle 1 and the combined force of the gravity of the winding needle 1 and all the coils 3 wound on the winding needle 1 basically cancel each other out. Therefore, the combined force on the winding needle 1 during the winding process is very small or basically zero, thereby effectively reducing the deflection deformation of the winding needle 1 and realizing "zero" deflection deformation winding of the winding needle 1. In addition, the diameter of the winding needle 1 can be effectively controlled, thereby realizing an increase in the energy density of the electrode assembly 4 and a significant improvement in the winding efficiency.

[0199] like Fig.19 As shown, it is a schematic diagram of the structure of the adjustment mechanism 5 in each embodiment of the present application.

[0200] In this embodiment, the adjustment mechanism 5 includes a driving member 501, a connecting member 502 and a contact head 503. The connecting member 502 is connected between the driving member 501 and the contact head 503. The driving member 501 includes a motor, the connecting member 502 includes a hard connecting rod, and the contact head 503 is in a spherical shape. The driving force generated by the driving member 501 is transmitted to the coil 3 through the connecting member 502 and the contact head 503, driving the coil 3 to move relative to the winding needle 1 to adjust the winding angle of the coil 3.

[0201] like Fig. 20 and Fig.21 As shown, cross-sectional views of two electrode assemblies 4 manufactured by the electrode assembly manufacturing device provided by the present application are respectively shown. Fig. 20 In the embodiment shown, the tail of the electrode assembly 4 is located at the rear side; Fig.21 In the illustrated embodiment, the tail portion of the electrode assembly 4 is located on the left side.

[0202] In the embodiment of the present application, at the head of the electrode assembly 4, in the circumferential direction, the head length of the fourth pole piece 36 is greater than the head length of the first pole piece 31; the head length of the second pole piece 32 is greater than the head length of the first pole piece 31; the head length of the second pole piece 32 is greater than the head length of the third pole piece 35.

[0203] At the tail of the electrode assembly 4 , in the circumferential direction, the tail length of the fourth pole piece 36 is greater than the tail length of the third pole piece 35 , the tail length of the second pole piece 32 is greater than the tail length of the third pole piece 35 ; and the tail length of the second pole piece 32 is greater than the tail length of the first pole piece 31 .

[0204] The electrode assembly manufacturing device embodiment provided in the present application can solve the problems of large diaphragm tension on the winding needle when winding multi-layer electrode sheets, large deflection and deformation of the winding needle, and insufficient rigidity of the winding needle, which will lead to wrinkles during winding and poor alignment of the diaphragm. Moreover, there is no need to increase the diameter of the winding needle, and the volume of the electrode assembly can be effectively controlled, which is beneficial to improving the energy density of the electrode assembly and enhancing the competitiveness of the electrode assembly. It can also avoid multiple rework due to problems such as wrinkles and poor alignment of the diaphragm, effectively improve the winding efficiency, and improve the manufacturing efficiency of the electrode assembly.

[0205] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0206] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0207] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned 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 includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode assembly manufacturing device, comprising: Rolling needle (1); and A plurality of unwinding devices (2) are configured to provide a plurality of coils (3) to the winding needle (1), and the plurality of coils (3) are wound onto the winding needle (1) to form an electrode assembly (4); In which, during the winding process, the plurality of coils (3) generate a plurality of forces on the winding needle (1), and the relative positions of the plurality of unwinding devices (2) are constructed so that the resultant force of the plurality of forces, the gravity of the coils (3) wound on the winding needle (1) and the gravity of the winding needle (1) is substantially zero.

2. The electrode assembly manufacturing device according to claim 1 further includes an adjustment mechanism (5), which is configured to adjust the position of at least one of the multiple coils (3) relative to the winding needle (1) to adjust the winding angle of the coil (3).

3. The electrode assembly manufacturing device according to claim 2, wherein: The adjustment mechanism (5) is configured to adjust the position of at least one of the plurality of coils (3) relative to the winding needle (1) in real time during the winding process, so as to adjust the winding angle of the coil (3) in real time.

4. The electrode assembly manufacturing device according to claim 2 or 3, wherein: The adjustment mechanism (5) comprises a driving member (501), a connecting member (502) and a contact head (503); the connecting member (502) connects the driving member (501) and the contact head (503); the contact head (503) is in contact with the coil (3); the driving member (501) is configured to drive the coil (3) to move relative to the coiling needle (1) so as to adjust the coiling angle of the coil (3).

5. The electrode assembly manufacturing device according to any one of claims 2 to 4 further comprises a detection device (6), wherein the detection device (6) is configured to detect the weight or length of the coil (3) wound on the winding needle (1) during the winding process, and the detection device (6) is connected to the adjustment mechanism (5) by signal so that the adjustment mechanism (5) adjusts the position of at least one of the multiple unwinding devices (2) relative to the winding needle (1) according to the detection result of the detection device (6).

6. The electrode assembly manufacturing device according to any one of claims 1 to 5, wherein: The plurality of unwinding devices (2) include a first unwinding device (21) for providing a first pole piece (31) to the winding needle (1), a second unwinding device (22) for providing a second pole piece (32) to the winding needle (1), a third unwinding device (23) for providing a first isolation film (33) to the winding needle (1), and a fourth unwinding device (24) for providing a second isolation film (34) to the winding needle (1), wherein the polarity of the first pole piece (31) is opposite to the polarity of the second pole piece (32).

7. The electrode assembly manufacturing device according to claim 6, wherein: The angle between the rolling direction of the first pole piece (31) and the rolling direction of the second pole piece (32) is greater than or equal to 60° and less than or equal to 180°; and / or the angle between the rolling direction of the first isolation film (33) and the rolling direction of the second isolation film (34) is greater than or equal to 60° and less than or equal to 180°.

8. The electrode assembly manufacturing device according to claim 6 further includes a first composite structure (71) and a second composite structure (72), wherein the first composite structure (71) is configured to composite the first pole piece (31) and the first isolation film (33) into a first composite pole piece (81) before winding, and the second composite structure (72) is configured to composite the second pole piece (32) and the second isolation film (34) into a second composite pole piece (82) before winding, and the angle between the rolling direction of the first composite pole piece (81) and the rolling direction of the second composite pole piece (82) is greater than or equal to 60° and less than or equal to 180°.

9. The electrode assembly manufacturing device according to any one of claims 6 to 8, wherein: The plurality of unwinding devices (2) further include a fifth unwinding device (25) for providing a third pole piece (35) to the winding needle (1), a sixth unwinding device (26) for providing a fourth pole piece (36) to the winding needle (1), a seventh unwinding device (27) for providing a third isolation film (37) to the winding needle (1), and an eighth unwinding device (28) for providing a fourth isolation film (38) to the winding needle (1), wherein the polarity of the third pole piece (35) is opposite to that of the fourth pole piece (36).

10. The electrode assembly manufacturing device according to claim 9, wherein: The angle between the rolling direction of the third pole piece (35) and the rolling direction of the fourth pole piece (36) is greater than or equal to 60° and less than or equal to 180°; and / or the angle between the rolling direction of the third isolation membrane (37) and the rolling direction of the fourth isolation membrane (38) is greater than or equal to 60° and less than or equal to 180°.

11. The electrode assembly manufacturing device according to claim 9 further includes a third composite structure (73) and a fourth composite structure (74), wherein the third composite structure (73) is configured to composite the third pole sheet (35) and the third isolation film (37) into a third composite pole sheet (83) before winding, and the fourth composite structure (74) is configured to composite the fourth pole sheet (36) and the fourth isolation film (38) into a fourth composite pole sheet (84) before winding, and the angle between the winding direction of the third composite pole sheet (83) and the winding direction of the fourth composite pole sheet (84) is greater than or equal to 60° and less than or equal to 180°.

12. The electrode assembly manufacturing device according to claim 11, wherein: The angle between the rolling direction of the first composite pole piece (81) and the rolling direction of the third composite pole piece (83) is not greater than 180°; and / or the angle between the rolling direction of the second composite pole piece (82) and the rolling direction of the fourth composite pole piece (84) is not greater than 180°.

13. A battery manufacturing device, comprising a housing and the electrode assembly manufacturing device according to any one of claims 1 to 12.

14. A method for manufacturing an electrode assembly, comprising: Providing a winding needle (1) and a plurality of unwinding devices (2); Providing a plurality of coils (3) to the coiling needle (1) through a plurality of the unwinding devices (2); and Winding a plurality of the coils (3) onto the winding needle (1) to form an electrode assembly (4); In the winding process, the multiple forces exerted by the multiple coils (3) on the winding needle (1), the combined force of the gravity of the coils (3) wound on the winding needle (1) and the gravity of the winding needle (1) are substantially zero.

15. A battery manufacturing method, comprising the electrode assembly manufacturing method according to claim 14.

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