Winding Machine, Battery Production Equipment and Winding Method

Abstract

The present invention discloses a winding machine, a battery production device, and a winding method. The winding machine includes: a winding needle, which includes a first lobe of the winding needle and a second lobe of the winding needle spaced apart from the first lobe of the winding needle, and two relief grooves are provided on the circumferential surface of the winding needle and spaced apart in the circumferential direction of the winding needle; two blanking components, which are configured to be respectively inserted into the two relief grooves and move axially relative to the winding needle to remove the pole piece wound around the winding needle, and the relative positions of the blanking components in the relief grooves are configured to be adjustable along the circumferential direction of the winding needle; a control device, which is configured to control the relative rotation of the blanking components and the winding needle and obtain the diameter of the winding needle, and the control device is further configured to: adjust the relative position of the blanking components in the relief grooves towards the downstream end of the relief groove along the first direction in response to an increase in the diameter; or, adjust the relative position of the blanking components in the relief grooves towards the upstream end of the relief groove along the first direction in response to a decrease in the diameter.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a winding machine, a battery production device, and a winding method. Background Art

[0002] Secondary batteries have been widely used in some electronic devices, electric vehicles, electric toys, and electric equipment. For example, lithium-ion batteries are currently widely used in mobile phones, laptop computers, battery cars, electric vehicles, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. The most common preparation method of the battery core is to wind the positive electrode plate, the negative electrode plate, and the separator on a winding needle multiple times to form it.

[0003] After the core is wound, there is a situation where the lengths of the electrode plates in the inner circle of different cores are inconsistent, thus affecting the consistency of the core parameters. Summary of the Invention

[0004] The present application aims to provide a winding machine, a battery production device, and a winding method to improve the problem of inconsistent lengths of the inner-circle electrode plates of the core.

[0005] According to one aspect of the embodiments of the present application, the present application provides a winding machine, which includes: a winding needle, including a first lobe winding needle and a second lobe winding needle spaced apart from the first lobe winding needle, and two relief grooves are provided on the circumferential surface of the winding needle at intervals in the circumferential direction of the winding needle; two blanking components, configured to be respectively inserted into the two relief grooves and move axially along the winding needle relative to the winding needle to remove the electrode plates wound on the winding needle, and the relative positions of the blanking components in the relief grooves are configured to be adjustable along the circumferential direction of the winding needle; a control device, configured to control the relative rotation of the blanking components and the winding needle and obtain the diameter of the winding needle, and the control device is further configured to: in response to an increase in the diameter, adjust the relative positions of the blanking components in the relief grooves towards the downstream end of the relief groove along a first direction; or, in response to a decrease in the diameter, adjust the relative positions of the blanking components in the relief grooves towards the upstream end of the relief groove along the first direction, where the first direction is the direction in which the winding needle rotates to wind the electrode plates. In response to the change in the diameter of the winding needle, when removing the wound electrode plates from the winding needle, by adjusting the relative positions of the blanking components in the relief grooves, the length of the inner-circle electrode plates between the two blanking components can be adjusted, which is beneficial to solving the problem that the inner-circle electrode plates change due to the change of the winding needle, thereby ensuring the consistency of the lengths of the inner-circle electrode plates.

[0006] In some embodiments, the size of the clearance groove in the circumferential direction of the winding needle is larger than the size of the blanking component in the circumferential direction of the winding needle. This is helpful to ensure that the relative position of the blanking component in the clearance groove is adjusted to adjust the length of the inner circle pole piece between the two blanking components, which is helpful to solve the problem that the inner circle pole piece changes due to the change of the winding needle, thereby ensuring the consistency of the length of the inner circle pole piece.

[0007] In some embodiments, the winding machine further includes a winding needle driving component, which is connected to the winding needle in a transmission manner to drive the winding needle to wind the pole piece, and the control device is connected to the winding needle driving component by signal to adjust the relative position of the blanking component in the clearance groove by controlling the rotation of the winding needle. The same winding needle driving component can be used to drive the winding needle to wind the pole piece and adjust the relative position of the blanking component in the clearance groove, which is conducive to simplifying the structure of the equipment and reducing the equipment cost.

[0008] In some embodiments, the winding machine further comprises a diameter detection component connected to the control device signal, and the diameter detection component is configured to detect the diameter of the winding needle. The control device detects the diameter of the winding needle through the diameter detection component, so as to adjust the position of the blanking component in the clearance groove according to the diameter of the winding needle, thereby ensuring the consistency of the length of the inner ring pole piece.

[0009] In some embodiments, the two clearance grooves are arranged symmetrically with respect to the axis of the winding needle. The two blanking parts are respectively inserted into the two clearance grooves, and the positions of the two blanking parts in the corresponding clearance grooves can be adjusted synchronously, which is conducive to increasing the adjustment range of the inner circle pole piece length, thereby ensuring the consistency of the inner circle pole piece length.

[0010] In some embodiments, the gap between the first and second winding needles for accommodating the pole piece passes through the winding needle along the diameter direction of the winding needle. The connecting line of the two clearance grooves extends along the diameter direction of the winding needle, and the two clearance grooves are at the same distance from the two ends of the gap in the circumferential direction of the winding needle. The positions of the two blanking parts in the two clearance grooves are adjusted synchronously, and the lengths of the second and third pole pieces can be adjusted synchronously, and the adjustment sizes are basically the same.

[0011] In some embodiments, the two clearance grooves are spaced 180 degrees apart in the circumferential direction of the winding needle. The positions of the two blanking components in the two clearance grooves are adjusted synchronously, and the lengths of the second pole piece and the third pole piece can be adjusted synchronously, and the adjustment sizes are substantially the same.

[0012] According to another aspect of the present application, a battery production device is also provided, and the battery production device includes the above-mentioned winding machine.

[0013] According to another aspect of the present application, a winding method for the above-mentioned winding machine is also provided, the winding method comprising: obtaining the diameter of the winding needle; adjusting the relative position of the blanking component in the makeshift groove, including adjusting the relative position of the blanking component in the makeshift groove toward the downstream end of the makeshift groove along the first direction in response to an increase in the diameter of the winding needle; or, adjusting the relative position of the blanking component in the makeshift groove toward the upstream end of the makeshift groove along the first direction in response to a decrease in the diameter; controlling the blanking component to move axially relative to the winding needle along the winding needle so as to separate the pole piece from the winding needle.

[0014] In some embodiments, the relative position of the blanking component in the clearance groove is adjusted by controlling the rotation of the winding needle. In view of the change in the diameter of the winding needle, when the pole piece that has been wound is taken off the winding needle, the length of the inner circle pole piece between the two blanking components is adjusted by adjusting the relative position of the blanking component in the clearance groove, which is conducive to solving the problem that the inner circle pole piece changes due to the change of the winding needle, thereby ensuring the consistency of the length of the inner circle pole piece.

[0015] In some embodiments, adjusting the relative position of the blanking component in the clearance groove toward the downstream end of the clearance groove along the first direction includes: controlling the winding needle to rotate in a second direction opposite to the first direction, or reducing the amount of rotation of the winding needle along the first direction. The same winding needle driving component can be used to drive the winding needle to wind the pole piece and adjust the relative position of the blanking component in the clearance groove, which is conducive to simplifying the structure of the equipment and reducing the equipment cost.

[0016] In some embodiments, adjusting the relative position of the blanking component in the make way slot toward the upstream end of the make way slot along the first direction includes: controlling the winding needle to rotate along the first direction. The same winding needle driving component can be used to drive the winding needle to wind the pole piece and to adjust the relative position of the blanking component in the make way slot, which is beneficial to simplifying the structure of the equipment and reducing the equipment cost. By applying the technical solution of the present application, in response to changes in the diameter of the winding needle, when removing the wound pole piece from the winding needle, the length of the inner circle pole piece between the two blanking components can be adjusted by adjusting the relative position of the blanking component in the make way slot, which is beneficial to solving the problem of changes in the inner circle pole piece due to changes in the winding needle, thereby ensuring the consistency of the length of the inner circle pole piece.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 The structural schematic diagram of an electrical device disclosed in some embodiments of the present application is shown.

[0020] Figure 2 The exploded structural schematic diagram of a battery disclosed in some embodiments of the present application is shown.

[0021] Figure 3 The structural schematic diagram of a battery cell disclosed in some embodiments of the present application is shown.

[0022] Figure 4 The schematic diagram of the cooperation relationship between the winding needle and the blanking component of a winding machine disclosed in some embodiments of the present application is shown.

[0023] Figure 5 The schematic diagram of the cooperation relationship between the winding needle and the blanking component of a winding machine and the pole piece disclosed in some embodiments of the present application is shown.

[0024] Figure 6 The schematic diagram of the cooperation relationship between the winding needle and the blanking component of a winding machine disclosed in some embodiments of the present application is shown.

[0025] Figure 7 The schematic diagram of the cooperation relationship between the winding needle and the blanking component of a winding machine disclosed in some embodiments of the present application is shown.

[0026] Figure 8 The block diagram of the control system of a winding machine disclosed in some embodiments of the present application is shown.

[0027] In the figure: 1000, vehicle; 100, battery pack; 110, box body; 111, first part; 112, second part; 120, battery cell; 121, end cover; 121a, electrode terminal; 122, housing; 123, cell assembly; 123a, tab; 200, controller; 300, motor; 1, winding needle; 11, first lobe of the winding needle; 12, second lobe of the winding needle; 13, relief groove; 2, blanking component; 3, pole piece; 14, slit; 31, first pole piece; 32, second pole piece; 33, third pole piece; 4, winding needle drive component; 5, control device; 6, diameter detection component; 7, blanking component drive mechanism. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present application and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0030] The orientation terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0031] Further, the "range" disclosed in this application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise specified, the numerical range "a-b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been fully listed herein, and "0-5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0032] If there is no special instruction, all embodiments and optional embodiments of this application can be combined with each other to form a new technical solution.

[0033] If there is no special instruction, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0034] If there is no special instruction, all steps of this application can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b), and (c), or can also include steps (a), (c), and (b), or can also include steps (c), (a), and (b), etc.

[0035] If there is no special instruction, the "including" and "comprising" mentioned in this application mean open-ended or can also be closed-ended. For example, the "including" and "comprising" can mean that other components not listed can also be included or comprised, or can only include or comprise the listed components.

[0036] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0037] Currently, judging from the development of the market situation, 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 plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0038] Figure 1 The structural schematic diagram of an electrical device using a battery as a power source is shown; as Figure 1 shown, the electrical device of this embodiment includes a vehicle 1000, and the vehicle 1000 can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery pack 100 is arranged inside the vehicle 1000, and the battery pack 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery pack 100 can be used to supply power to the vehicle 1000. For example, the battery pack 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0039] In some embodiments of this application, the battery pack 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0040] Please refer to Figure 2 , Figure 2Explosion diagram of the battery pack 100 provided by some embodiments of the present application. The battery pack 100 includes a box body 110 and a battery module disposed within the box body 110. The battery module includes a plurality of battery cells 120, and the battery cells 120 are accommodated within the box body 110. Among them, the box body 110 is used to provide an accommodation space for the battery cells 120, and the box body 110 can adopt various structures. In some embodiments, the box body 110 may include a first part 111 and a second part 112. The first part 111 and the second part 112 are mutually covered, and the first part 111 and the second part 112 jointly define an accommodation space for accommodating the battery cells 120. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure. The first part 111 covers the open side of the second part 112 so that the first part 111 and the second part 112 jointly define the accommodation space; the first part 111 and the second part 112 may also both be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box body 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0041] In the battery pack 100, there may be a plurality of battery cells 120. The plurality of battery cells 120 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 120. The plurality of battery cells 120 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 120 is accommodated within the box body 110; of course, the battery pack 100 can also be that a plurality of battery cells 120 are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then a plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated within the box body 110. The battery pack 100 may further include other structures. For example, the battery pack 100 may further include a busbar component for realizing the electrical connection among the plurality of battery cells 120.

[0042] Among them, each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0043] Please refer to Figure 3 , Figure 3 Schematic exploded view of the battery cell 120 provided by some embodiments of the present application. The battery cell 120 refers to the smallest unit that makes up the battery pack 100. As Figure 3 shown, the battery cell 120 includes an end cap 121, a housing 122, a core component 123, and other functional components.

[0044] The end cap 121 refers to a component that covers the opening of the housing 122 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the housing 122 to fit the housing 122. Optionally, the end cap 121 can be made of a material with a certain hardness and strength, such as aluminum alloy. In this way, the end cap 121 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 120 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 121a can be provided on the end cap 121. The electrode terminal 121a can be used for electrically connecting to the battery cell assembly 123 to output or input the electrical energy of the battery cell 120. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold can also be provided on the end cap 121. The material of the end cap 121 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 121, and the insulating member can be used to isolate the electrical connection components in the housing 122 from the end cap 121 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0045] The housing 122 is a component used to cooperate with the end cap 121 to form the internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the battery cell assembly 123, the electrolyte, and other components. The housing 122 and the end cap 121 can be independent components. An opening can be provided on the housing 122, and the end cap 121 is covered on the opening to form the internal environment of the battery cell 120. Without limitation, the end cap 121 and the housing 122 can also be integrated. Specifically, the end cap 121 and the housing 122 can first form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 122, the end cap 121 is then covered on the housing 122. The housing 122 can be of various shapes and sizes, such as rectangular parallelepiped shape, cylindrical shape, hexagonal prism shape, etc. Specifically, the shape of the housing 122 can be determined according to the specific shape and size of the battery cell assembly 123. The material of the housing 122 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0046] The battery cell assembly 123 is a component in the battery cell 120 where an electrochemical reaction occurs. The housing 122 can contain one or more battery cell assemblies 123. The battery cell assembly 123 is mainly formed by winding or stacking electrode sheets, wherein the electrode sheets include positive electrode sheets and negative electrode sheets, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet.

[0047] The electrode plate mainly consists of a flaky current collector and the active material coated on the current collector. The parts of the positive electrode plate, negative electrode plate, cathode electrode plate, and anode electrode plate with the active material constitute the main body of the battery cell assembly, and the parts of the positive electrode plate and negative electrode plate without the active material respectively constitute the electrode tabs 123a. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery pack 100, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 123a are connected to the electrode terminals to form a current loop.

[0048] The winding machine is used to wind the electrode plates into a battery cell assembly, where the electrode plates include a cathode electrode plate and an anode electrode plate stacked with the cathode electrode plate. A separator is arranged between the cathode electrode plate and the anode electrode plate. Refer to Figure 4 and 5 , the winding machine includes a rotatable winding needle 1, the winding needle 1 includes a first lobe winding needle 11 and a second lobe winding needle 12 arranged at an interval from the first lobe winding needle 11, and two relief grooves 13 are arranged on the circumferential surface of the winding needle 1 at intervals in the circumferential direction of the winding needle 1.

[0049] The blanking mechanism for taking down the wound electrode plates includes two blanking components 2, and the two blanking components 2 are arranged in parallel and at intervals. The blanking component 2 is configured to be respectively inserted into the two relief grooves 13 and move axially along the winding needle 1 relative to the winding needle 1 to take down the electrode plates 3 wound around the winding needle 1, and the relative positions of the blanking components 2 in the relief grooves 13 are configured to be adjustable circumferentially along the winding needle 1.

[0050] When the winding machine winds the electrode plates 3 into a battery cell, the head of the electrode plate is clamped between the first lobe winding needle 11 and the second lobe winding needle 12, and then the winding needle 1 is controlled to rotate in the first direction F, so that the cathode electrode plate, the anode electrode plate, and the separator are wound around the winding needle 1 in sequence in the second direction opposite to the first direction F. Wherein the first direction F is the direction in which the winding needle 1 rotates to wind the electrode plates 3.

[0051] After the winding of the electrode plates 3 is completed. The two blanking components 2 move relative to the winding needle 1 along a direction parallel to the winding needle 1 to be respectively inserted into the two relief grooves 13, and then the blanking components 2 are moved radially outward along the winding needle 1 from the relief grooves 13, so that the two blanking components 2 receive the wound electrode plates 3, and then the blanking components 2 move relative to the winding needle 1 along a direction parallel to the winding needle 1 to take down the electrode plates 3 from the winding needle 1. Wherein, the movement of the blanking component 2 relative to the winding needle 1 along a direction parallel to the winding needle 1 can be the movement of the blanking component 2 or the movement of the winding needle 1.

[0052] Refer to Figure 4 and Figure 5As shown, the length of the inner circle pole piece of the wound pole piece 3 is equal to the distance between the two blanking parts 2 after receiving the pole piece 3, and the above-mentioned inner circle pole piece includes a first pole piece 31, a second pole piece 32 and a third pole piece 33. The first pole piece 31 is located in the gap 14 between the first petal winding needle 11 and the second petal winding needle 12, and the length of the first pole piece 31 is L1. The second pole piece 32 is located at the port of the gap 14 and between the blanking part 2 located upstream and adjacent to the port along the first direction F, and the length of the second pole piece 32 is L2. The third pole piece 33 is located at the other port of the gap 14 and between the blanking part 2 located upstream and adjacent to the other port along the first direction F, and the length of the third pole piece 33 is L3.

[0053] The length L of the inner circle pole piece is L1+L2+L3. Since the diameter of the winding needle 1 can be adjusted as needed, after the diameter of the winding needle 1 is adjusted, the lengths of the first pole piece 31, the second pole piece 32 and the third pole piece 33 all increase with the increase of the diameter of the winding needle 1, and all decrease with the decrease of the diameter of the winding needle 1. That is, the length L of the inner circle pole piece increases with the increase of the diameter of the winding needle 1, and decreases with the decrease of the diameter of the winding needle 1, which leads to inconsistent lengths of the inner circle pole pieces of different battery cells.

[0054] In order to improve the above-mentioned problem, the control device 5 of the winding machine in the present application is configured to control the blanking component 2 and the winding needle 1 to rotate relative to each other, and the control device 5 is also configured to obtain the diameter of the winding needle 1 and adjust the relative position of the blanking component 2 in the clearance groove 13 toward the downstream end of the clearance groove 13 along the first direction in response to the increase in the diameter. The first direction F is the direction in which the winding needle 1 rotates to wind the pole piece 3.

[0055] See also Figure 6 In response to the situation where the diameter of the winding needle 1 becomes larger, when the pole piece 3 is removed from the winding needle 1 after the winding is completed, the position of the blanking component 2 in the make way groove 13 is adjusted downstream in the first direction F, so that the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 are reduced relative to the position of the unajusted blanking component 2, which is helpful to offset the problem of the increase in the length of at least part of the inner circle pole piece.

[0056] In some embodiments, see Figure 7 The control device 5 is configured to adjust the relative position of the blanking component 2 in the clearance groove 13 toward the upstream end of the clearance groove 13 along the first direction in response to the reduction in diameter.

[0057] In case that the diameter of the winding needle 1 is reduced, when the pole piece 3 is removed from the winding needle 1 after the winding is completed, the position of the blanking component 2 in the make way groove 13 is adjusted upstream of the first direction F, so that the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 are increased relative to the undressed position of the blanking component 2, which is beneficial to offset the problem of at least part of the reduction in the length of the inner circle pole piece, thereby ensuring the consistency of the length of the inner circle pole piece.

[0058] It should be noted that the position of the blanking component 2 in the clearance groove 13 can be adjusted by rotating the winding needle 1 or by rotating the blanking component.

[0059] In the technical solution of the present application, in response to the change in the diameter of the winding needle 1, when the completed wound pole piece 3 is removed from the winding needle 1, the relative position of the blanking component 2 in the make way groove 13 is adjusted to achieve adjustment of the length of the inner circle pole piece between the two blanking components 2, which is helpful to solve the problem of the inner circle pole piece changing due to the change of the winding needle 1, thereby ensuring the consistency of the length of the inner circle pole piece.

[0060] In some embodiments, the dimension of the clearance groove 13 in the circumferential direction of the winding needle 1 is larger than the dimension of the blanking component 2 in the circumferential direction of the winding needle 1, which is beneficial to ensure the adjustment of the relative position of the blanking component 2 in the clearance groove 13 to achieve the adjustment of the length of the inner circle pole piece between the two blanking components 2, which is beneficial to solve the problem of the inner circle pole piece changing due to the change of the winding needle 1, thereby ensuring the consistency of the length of the inner circle pole piece.

[0061] See also Figure 8 The winding machine also includes a winding needle driving component 4, which is connected to the winding needle 1 to drive the winding needle 1 to wind the pole piece 3. The control device 5 is connected to the winding needle driving component 4 by signal to adjust the relative position of the unloading component 2 in the clearance groove 13 by controlling the rotation of the winding needle 1.

[0062] The winding needle driving component 4 can drive the winding needle to move along the first direction F to drive the winding needle 1 to wind the pole piece 3, and after completing the winding of the pole piece 3, it can drive the winding needle 1 to rotate along the first direction F and the second direction opposite to the first direction F to adjust the position of the blanking component 2 in the clearance groove 13, so as to adjust the length of the inner circle pole piece between the two blanking components 2, which is conducive to solving the problem that the inner circle pole piece changes due to the change of the winding needle 1. Furthermore, the same winding needle driving component 4 can be used to drive the winding needle 1 to wind the pole piece 3 and to adjust the relative position of the blanking component 2 in the clearance groove 13, which is conducive to simplifying the structure of the equipment and reducing the equipment cost.

[0063] In some embodiments, the winding needle driving component 4 includes a motor, which includes one of a servo motor and a stepper motor. The control device 5 is connected to the motor signal to control the rotation amount of the motor.

[0064] In some embodiments, the winding machine further includes a blanking component driving mechanism 7, and the control device 5 is connected to the blanking component driving mechanism 7 by signal, so as to control the blanking component 2 to move in a direction parallel to the winding needle 1 so that the blanking component 2 is inserted into the clearance groove 13. The control device 5 is connected to the blanking component driving mechanism 7 by signal, so as to control the blanking component 2 to move toward the clearance groove 13 along the radial direction of the winding needle 1, so that the blanking component 2 receives the pole piece that has been wound.

[0065] In some embodiments, the winding machine further includes a diameter detection component 6 connected to the control device 5 by signal, and the diameter detection component 6 is configured to detect the diameter of the winding needle 1. The control device 5 detects the diameter of the winding needle 1 through the diameter detection component 6, so as to adjust the position of the blanking component 2 in the clearance groove 13 according to the diameter of the winding needle 1, thereby ensuring the consistency of the length of the inner ring pole piece.

[0066] In some embodiments, the diameter detection component 6 includes a diameter detection sensor, and the diameter detection sensor includes one of a laser scanning diameter detection sensor, a CCD projection diameter detection sensor, and a laser diffraction diameter detection sensor.

[0067] In some embodiments, the two clearance grooves 13 are arranged symmetrically with respect to the axis of the winding needle 1. The two blanking parts 2 are respectively inserted into the two clearance grooves 13, and the positions of the two blanking parts 2 in the corresponding clearance grooves 13 can be adjusted synchronously, which is conducive to increasing the adjustment range of the inner circle pole piece length, thereby ensuring the consistency of the inner circle pole piece length.

[0068] The gap 14 for accommodating the pole piece 3 between the first petal winding needle 11 and the second petal winding needle 12 penetrates the winding needle 1 along the diameter direction of the winding needle 1. The two clearance grooves 13 are spaced 180 degrees apart in the circumferential direction of the winding needle 1. The connecting line of the two clearance grooves 13 extends along the diameter direction of the winding needle 1, and the two clearance grooves 13 are at the same distance from the two ends of the gap 14 in the circumferential direction of the winding needle 1. The positions of the two blanking parts 2 in the two clearance grooves 13 are adjusted synchronously, and the lengths of the second pole piece 32 and the third pole piece 33 can be adjusted synchronously, and the adjustment sizes are basically the same.

[0069] According to another aspect of the present application, a battery production device is also provided, and the battery production device includes the above-mentioned winding machine.

[0070] According to another aspect of the present application, a winding method for the above-mentioned winding machine is also provided, and the winding method includes.

[0071] Get the diameter of winding needle 1.

[0072] Adjust the relative position of the blanking member 2 within the relief groove 13, including adjusting the relative position of the blanking member 2 within the relief groove 13 towards the downstream end of the relief groove 13 along the first direction F in response to an increase in the diameter of the coiling needle 1. Or, adjust the relative position of the blanking member 2 within the relief groove 13 towards the upstream end of the relief groove 13 along the first direction F in response to a decrease in the diameter.

[0073] Control the axial movement of the blanking member 2 relative to the coiling needle 1 along the axis of the coiling needle 1, so that the pole piece 3 is separated from the coiling needle 1.

[0074] In response to a change in the diameter of the coiling needle 1, when removing the wound pole piece 3 from the coiling needle 1, by adjusting the relative position of the blanking member 2 within the relief groove 13, the length of the inner ring pole piece between the two blanking members 2 can be adjusted, which helps to solve the problem that the length of the inner ring pole piece changes due to the change of the coiling needle 1, thereby ensuring the consistency of the length of the inner ring pole piece.

[0075] In some embodiments, the relative position of the blanking member 2 within the relief groove 13 is adjusted by controlling the rotation of the coiling needle 1. The coiling needle driving member 4 can not only drive the coiling needle to move along the first direction F to drive the coiling needle 1 to wind the pole piece 3, but also, after winding the pole piece 3, drive the coiling needle 1 to rotate along the first direction F and the second direction opposite to the first direction F to adjust the position of the blanking member 2 within the relief groove 13, so as to adjust the length of the inner ring pole piece between the two blanking members 2, which helps to solve the problem that the length of the inner ring pole piece changes due to the change of the coiling needle 1. Further, using the same coiling needle driving member 4 to drive the coiling needle 1 to wind the pole piece 3 and to adjust the relative position of the blanking member 2 within the relief groove 13 is beneficial to simplifying the structure of the device and reducing the cost of the device.

[0076] In some embodiments, adjusting the relative position of the blanking member 2 within the relief groove 13 towards the downstream end of the relief groove 13 along the first direction F includes: controlling the coiling needle 1 to rotate in the second direction opposite to the first direction F, or, reducing the rotation amount of the coiling needle 1 along the first direction F.

[0077] See Figure 6 , in the case where the diameter of the coiling needle 1 becomes larger, when removing the pole piece 3 from the coiling needle 1 after winding the pole piece 3, adjust the position of the blanking member 2 within the relief groove 13 towards the downstream of the first direction F, so that the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 are reduced relative to the position where the blanking member 2 is not adjusted, which helps to offset at least part of the problem of the increase in the length of the inner ring pole piece.

[0078] In some embodiments, adjusting the relative position of the blanking member 2 within the relief groove 13 towards the upstream end of the relief groove 13 along the first direction F includes: controlling the coiling needle 1 to rotate along the first direction F.

[0079] SeeFigure 7 In view of the situation where the diameter of the winding needle 1 is reduced, when the pole piece 3 is removed from the winding needle 1 after the winding is completed, the position of the blanking component 2 in the make way groove 13 is adjusted upstream of the first direction F, so that the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 are increased relative to the position of the unajusted blanking component 2, which is beneficial to offset the problem of at least part of the reduction in the length of the inner circle pole piece, thereby ensuring the consistency of the length of the inner circle pole piece.

[0080] See also Figure 5 , since the diameter of the winding needle 1 can be adjusted as needed, the length L of the inner circle pole piece will also change accordingly. The inner circle pole piece includes a first pole piece 31, a second pole piece 32 and a third pole piece 33. The length of the first pole piece 31 is L1. The length of the second pole piece 32 is L2. The length of the third pole piece 33 is L3. Among them, the length L of the inner circle pole piece = L1 + L2 + L3.

[0081] When the diameter of the winding needle 1 increases, the length of the first pole piece 31 increases synchronously; when the diameter of the winding needle 1 decreases, the length of the first pole piece 31 decreases synchronously. If the phase of the winding needle 1 does not change when the wound cell is removed from the winding needle 1, the length of the inner circle pole piece will be inconsistent.

[0082] See also Figure 6 When the diameter of the winding needle 1 increases, the position of the blanking component 2 remains unchanged when the wound cell is removed from the winding needle 1. In order to ensure that the length of the pole piece between the two blanking components 2 remains unchanged, the winding needle 1 rotates clockwise (opposite to the first direction F) by an angle X. The blanking component 2 is not at the center of the clearance groove 13.

[0083] When the diameter of the winding needle 1 increases, the length L1 of the first pole piece 31 increases. By adjusting the angle (or phase) of the winding needle 1, the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 are reduced, which is conducive to achieving the unchanged length L of the inner circle pole piece.

[0084] See also Figure 7 When the diameter of the winding needle 1 becomes smaller, the position of the blanking component 2 remains unchanged when the wound cell is removed from the winding needle 1. In order to ensure that the length of the pole piece between the two blanking components 2 remains unchanged, the winding needle 1 rotates counterclockwise (consistent with the first direction F) by an angle X. The blanking component 2 is not at the center of the clearance groove 13.

[0085] When the diameter of the winding needle 1 decreases, the length L1 of the first pole piece 31 decreases. By adjusting the angle (or phase) of the winding needle 1, the length L2 of the second pole piece 32 and the length L3 of the third pole piece 33 increase, which is conducive to achieving the unchanged length L of the inner circle pole piece.

[0086] The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A winding machine, characterized in that: include: A winding needle (1), comprising a first winding needle (11) and a second winding needle (12) arranged at an interval from the first winding needle (11), wherein the circumferential surface of the winding needle (1) is provided with two clearance grooves (13) arranged at an interval in the circumferential direction of the winding needle (1), and the two clearance grooves (13) are arranged symmetrically with respect to the axis of the winding needle (1); Two material removal components (2) are configured to be respectively inserted into the two clearance grooves (13) and to move relative to the winding needle (1) along the axial direction of the winding needle (1) to remove the pole piece (3) wound on the winding needle (1), and the relative position of the material removal component (2) in the clearance groove (13) is configured to be adjustable along the circumference of the winding needle (1); The control device (5) is configured to control the relative rotation of the blanking component (2) and the winding needle (1) and to obtain the diameter of the winding needle (1), and the control device (5) is also configured to: In response to the increase in the diameter, the relative position of the blanking component (2) in the clearance groove (13) is adjusted toward the downstream end of the clearance groove (13) along the first direction; or, In response to the reduction in the diameter, the relative position of the blanking component (2) in the clearance groove (13) is adjusted toward the upstream end of the clearance groove (13) along the first direction, The first direction is the direction in which the winding needle (1) rotates to wind the pole piece (3).

2. The winding machine according to claim 1, characterized in that The dimension of the clearance groove (13) in the circumferential direction of the winding needle (1) is greater than the dimension of the blanking component (2) in the circumferential direction of the winding needle (1).

3. The winding machine according to claim 1, characterized in that The invention also comprises a winding needle driving component (4), wherein the winding needle driving component (4) is in driving connection with the winding needle (1) so as to drive the winding needle (1) to wind the pole piece (3), and the control device (5) is in signal connection with the winding needle driving component (4) so ​​as to adjust the relative position of the unloading component (2) in the clearance groove (13) by controlling the rotation of the winding needle (1).

4. The winding machine according to claim 1, characterized in that It also comprises a diameter detection component (6) connected to the control device (5) by signal, and the diameter detection component (6) is configured to detect the diameter of the winding needle (1).

5. The winding machine according to claim 1, characterized in that: The gap (14) between the first lobe winding needle (11) and the second lobe winding needle (12) for accommodating the pole piece (3) penetrates the winding needle (1) along the diameter direction of the winding needle (1).

6. A battery production equipment, characterized in that: A winding machine comprising the winding machine described in any one of claims 1 to 5.

7. A winding method for a winding machine according to any one of claims 1 to 5, characterized in that: include: Obtaining the diameter of the winding needle (1); Adjusting the relative position of the blanking component (2) in the clearance groove (13), comprising adjusting the relative position of the blanking component (2) in the clearance groove (13) toward the downstream end of the clearance groove (13) along the first direction in response to an increase in the diameter of the winding needle (1); or, adjusting the relative position of the blanking component (2) in the clearance groove (13) toward the upstream end of the clearance groove (13) along the first direction in response to a decrease in the diameter; The blanking component (2) is controlled to move relative to the winding needle (1) along the axial direction of the winding needle (1) so as to separate the pole piece (3) from the winding needle (1).

8. The winding method according to claim 7, characterized in that: The relative position of the blanking component (2) in the clearance groove (13) is adjusted by controlling the rotation of the winding needle (1).

9. The winding method according to claim 7, characterized in that: Adjusting the relative position of the blanking component (2) in the clearance groove (13) toward the downstream end of the clearance groove (13) along the first direction includes: controlling the winding needle (1) to rotate along a second direction opposite to the first direction, or reducing the rotation amount of the winding needle (1) along the first direction.

10. The winding method according to claim 7, characterized in that: Adjusting the relative position of the blanking component (2) in the clearance groove (13) toward the upstream end of the clearance groove (13) along the first direction comprises: controlling the winding needle (1) to rotate along the first direction.

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