Winding needle and winding device

Abstract

The utility model relates to the field of winding equipment, and provides a winding needle and a winding device.The winding needle comprises a first winding body, a second winding body and a support, the first winding body and the second winding body are both connected with the support, and a gap for placing a pole piece is formed between the first winding body and the second winding body; the fixing device comprises a permanent magnet and an electromagnet, and the electromagnet is arranged to be close to or away from the permanent magnet in an electrified state; wherein a fixing device is arranged on the side, close to the second roll body, of the first roll body, one of a permanent magnet and an electromagnet of the fixing device is connected with the first roll body, and the other one of the permanent magnet and the electromagnet of the fixing device is movably arranged in the direction close to or away from the second roll body so as to abut against or be separated from the pole piece. Compared with the prior art in which the air bag expansion assembly needs to be inflated or deflated, the fixing device controlled by the current or the voltage is higher in response speed, so that the pressing speed and the loosening speed of the pole piece can be improved, and the capacity of a battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of winding equipment, in particular to a winding needle and a winding device. Background Art

[0002] Battery cells are an important component of lithium batteries. Battery cells are often wound by winding machines, and the winding needle is the core component of the winding machine.

[0003] The winding needle in the prior art generally includes a support, a winding body and an airbag expansion assembly, wherein two winding bodies are provided, both of which are connected to the support, and there is a distance between the two winding bodies. The airbag expansion assembly is provided on the side where the two winding bodies are close to each other. During the winding process, the pole piece extends between the two winding bodies, and the airbag expansion assembly is inflated and expands to clamp the pole piece. After the winding is completed, the airbag expansion assembly is deflated to restore the deformation and release the pole piece.

[0004] During the process of clamping the pole piece with the airbag expansion assembly, the airbag expansion assembly needs to be inflated, and during the process of loosening the pole piece, the airbag expansion assembly needs to be deflated. The time consumed for charging and deflation is relatively long, resulting in a slow response speed of the airbag expansion assembly, which affects the production capacity of the battery cell. Utility Model Content

[0005] The utility model provides a winding needle and a winding device, which are used to solve or improve the defect of slow response speed of airbag expansion components in the prior art, and achieve the effect of increasing the clamping speed or loosening speed of the winding needle to the pole piece.

[0006] The utility model provides a winding needle, comprising:

[0007] A first coil, a second coil and a support, wherein the first coil and the second coil are both connected to the support, and a gap is provided between the first coil and the second coil for inserting a pole piece;

[0008] A fixing device, comprising a permanent magnet and an electromagnet, wherein the electromagnet is arranged to be close to or away from the permanent magnet when powered on;

[0009] The fixing device is provided on a side of the first winding body close to the second winding body, and one of the permanent magnet and the electromagnet of the fixing device is connected to the first winding body, and the other is movably arranged in a direction approaching or moving away from the second winding body so as to abut against or disengage from the pole piece.

[0010] According to a roll provided by the utility model, at least two fixing devices are provided on the first roll, and at least two fixing devices are arranged along the axial direction of the first roll.

[0011] According to a reel provided by the utility model, the fixing device is also provided on the side of the second reel close to the first reel, and one of the permanent magnet and the electromagnet of the fixing device is connected to the second reel, and the other is movably arranged in a direction approaching or moving away from the first reel to be used for resisting or disengaging from the pole piece, and the fixing device on the second reel is arranged opposite to the fixing device on the first reel.

[0012] According to a roll provided by the utility model, at least two fixing devices are provided on the second roll, and at least two fixing devices are arranged along the axial direction of the second roll.

[0013] According to a winding body provided by the utility model, the electromagnet comprises a support frame and a coil wound around the outside of the support frame, and the support frame is provided with a receiving space for placing the permanent magnet.

[0014] According to a winding body provided by the utility model, it also includes a flexible pad, and the movable one of the permanent magnet and the electromagnet is provided with the flexible pad and is used to abut against the pole piece through the flexible pad.

[0015] According to a reel provided by the utility model, the fixing device further comprises a slot body, and both the permanent magnet and the electromagnet are at least partially arranged in the slot body.

[0016] According to a winding body provided by the utility model, the fixing device also includes an elastic sheet, the permanent magnet is connected to the slot body, the electromagnet is movably arranged in the slot body and is sleeved on the outside of the permanent magnet, the elastic sheet connects the electromagnet and the slot body, and is used to keep the outer wall of the electromagnet and the inner wall of the slot body at a preset distance.

[0017] According to a roll body provided by the utility model, at least one of the first roll body and the second roll body comprises a needle sleeve and a needle body sleeved on the outside of the needle sleeve.

[0018] The utility model also provides a winding device, comprising the winding needle as described above.

[0019] The winding needle provided by the utility model can accommodate the pole piece to be wound by arranging the first winding body and the second winding body on the support, and a gap is provided between the first winding body and the second winding body.

[0020] In addition, by arranging a fixing device on the first winding body, and the fixing device includes a permanent magnet, and an electromagnet that approaches or moves away from the permanent magnet in the energized state, after the pole piece is placed between the first winding body and the second winding body, a forward current or a forward voltage is passed through the electromagnet to make the electromagnet or the permanent magnet of the fixing device move and abut against the pole piece, thereby pushing the pole piece to the second winding body for fixing. After the winding is completed, a reverse current or a reverse voltage is passed through the electromagnet to make the electromagnet or the permanent magnet of the fixing device move in the reverse direction and disengage from the pole piece, thereby loosening the pole piece.

[0021] Configured in this way, the winding needle provided by the utility model can fix the pole piece by passing a forward current or a forward voltage through the electromagnet of the fixing device, and can release the pole piece by passing a reverse current or a reverse voltage through the electromagnet of the fixing device. Compared with the prior art that requires inflating or exhausting the airbag expansion component, the fixing device controlled by current or voltage has a faster response speed, thereby increasing the compression speed and release speed of the pole piece, thereby improving the battery cell production capacity.

[0022] At the same time, by adjusting the current or voltage loaded on the electromagnet, the interaction force between the electromagnet and the permanent magnet can be accurately adjusted, thereby achieving precise control of the clamping force of the pole piece, thereby avoiding the problem of excessive clamping force damaging the pole piece.

[0023] In addition, when the fixing device presses the pole piece, the fixing device forms a support between the first roll and the second roll, which can avoid the problem of the first roll and the second roll being deformed by approaching each other due to the winding of the pole piece during the winding process.

[0024] The winding device provided by the utility model includes the winding needle provided by the utility model, and thus includes all the above advantages of the winding needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the internal structure of the winding needle provided in some embodiments of the utility model;

[0027] Figure 2 yes Figure 1 A partial enlarged view of position Ⅰ of the view shown;

[0028] Figure 3 is a side sectional view of a fixing device provided in some embodiments of the utility model;

[0029] Figure 4 is an axonometric view of a winding needle provided in some embodiments of the utility model;

[0030] Figure 5 yes Figure 4 Schematic diagram after the second roll is removed in the view shown.

[0031] Reference numerals:

[0032] 1. First coil; 101. Needle sleeve; 102. Needle body; 2. Second coil; 3. Support; 4. Fixing device; 401. Permanent magnet; 402. Electromagnet; 402a. Support frame; 402b. Coil; 403. Slot body; 404. Elastic sheet; 5. Flexible pad. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Combine the following Figures 1 to 5 The winding needle provided in the embodiment of the utility model is described.

[0035] Specifically, the winding needle includes a first winding body 1 , a second winding body 2 , a support 3 and a fixing device 4 .

[0036] The first roll 1 and the second roll 2 are both connected to the support 3 , and there is a gap between the first roll 1 and the second roll 2 for inserting the pole piece.

[0037] The fixing device 4 includes a permanent magnet 401 and an electromagnet 402. The electromagnet 402 cooperates with the permanent magnet 401, and the electromagnet 402 is configured to be close to or away from the permanent magnet 401 when powered on. Specifically, under the condition that a current or voltage is applied to the electromagnet 402, the electromagnet 402 generates a magnetic field. When the direction of the magnetic field of the electromagnet 402 is opposite to the direction of the magnetic field of the permanent magnet 401, the electromagnet 402 and the permanent magnet 401 are away from each other, and when the direction of the magnetic field of the electromagnet 402 is the same as the direction of the magnetic field of the permanent magnet 401, the electromagnet 402 and the permanent magnet 401 are close to each other.

[0038] At the same time, a fixing device 4 is provided on one side of the first winding body 1 close to the second winding body 2, and one of the permanent magnet 401 and the electromagnet 402 of the fixing device 4 is connected to the first winding body 1, and the other is movably arranged in a direction close to or away from the second winding body 2, so as to abut against or disengage from the pole piece arranged between the first winding body 1 and the second winding body 2. For example, Figure 1 The example shown is that the permanent magnet 401 of the fixing device 4 is connected to the first winding body 1 , and the electromagnet 402 is movably arranged in a direction approaching or moving away from the second winding body 2 .

[0039] The winding needle provided in the embodiment of the utility model can accommodate the pole piece to be wound by arranging the first winding body 1 and the second winding body 2 on the support 3, and a gap is provided between the first winding body 1 and the second winding body 2.

[0040] In addition, by arranging a fixing device 4 on the side of the first winding body 1 close to the second winding body 2, and the fixing device 4 includes a permanent magnet 401, and an electromagnet 402 that moves close to or away from the permanent magnet 401 in the energized state, after the pole piece is placed between the first winding body 1 and the second winding body 2, a forward current or a forward voltage is passed through the electromagnet 402, so that the electromagnet 402 or the permanent magnet 401 of the fixing device 4 moves and contacts the pole piece, thereby pushing the pole piece to the second winding body 2 for fixing. After winding is completed, a reverse current or a reverse voltage is passed through the electromagnet 402, so that the electromagnet 402 or the permanent magnet 401 of the fixing device 4 moves in the reverse direction and separates from the pole piece, thereby loosening the pole piece.

[0041] Configured in this way, the winding needle provided in the embodiment of the utility model can fix the pole piece by passing a forward current or a forward voltage through the electromagnet 402 of the fixing device 4, and can release the pole piece by passing a reverse current or a reverse voltage through the electromagnet 402 of the fixing device 4. Compared with the prior art that requires inflating or exhausting the airbag expansion component, the fixing device 4 controlled by current or voltage has a faster response speed, thereby increasing the compression speed and release speed of the pole piece, thereby improving the battery cell production capacity.

[0042] At the same time, by adjusting the current or voltage loaded on the electromagnet 402, the interaction force between the electromagnet 402 and the permanent magnet 401 can be accurately adjusted, thereby achieving precise control of the clamping force of the pole piece, thereby avoiding the problem of excessive clamping force damaging the pole piece.

[0043] In addition, when the fixing device 4 presses the pole piece, the fixing device 4 forms a support between the first roll 1 and the second roll 2, which can avoid the problem of the first roll 1 and the second roll 2 approaching each other and deforming due to the winding action of the pole piece during the winding process.

[0044] Finally, after the fixing device 4 presses the pole piece, by increasing the current, the force between the permanent magnet 401 and the electromagnet 402 increases, and the fixing device 4 can drive the first winding body 1 and the second winding body 2 to deform and move away from each other, thereby achieving the effect of adjusting the outer circumference of the winding needle.

[0045] In some embodiments provided by the present invention, at least two fixing devices 4 are provided on the first winding body 1, and at least two fixing devices 4 are arranged along the axial direction of the first winding body 1. It should be noted that the axial direction of the first winding body 1 is the same as the axial direction of the winding needle, and both are in the same direction as the rotation axis of the winding needle.

[0046] In this way, by providing at least two fixing devices 4 arranged along the axial direction of the first winding body 1, the at least two fixing devices 4 can disperse the pressure to the pole piece in the axial direction of the first winding body 1, thereby providing a more uniform clamping force, reducing the problem of local stress concentration, and avoiding the pole piece from being crushed or deformed excessively.

[0047] In some embodiments provided by the present invention, a fixing device 4 is also provided on the side of the second winding body 2 close to the first winding body 1, and one of the permanent magnet 401 and the electromagnet 402 of the fixing device 4 is connected to the second winding body 2, and the other is movably arranged in a direction close to or away from the first winding body 1, so as to abut against or disengage from the pole piece. The fixing device 4 on the second winding body 2 is arranged opposite to the fixing device 4 on the first winding body 1. For example, Figure 1 The example shown is that the permanent magnet 401 of the fixing device 4 is connected to the second winding body 2 , and the electromagnet 402 is movably arranged in a direction approaching or moving away from the first winding body 1 .

[0048] In this embodiment, after the pole piece is placed between the first roll 1 and the second roll 2, the fixing device 4 on the first roll 1 and the fixing device 4 on the second roll 2 are close to each other to clamp the pole piece. After the winding is completed, the fixing device 4 on the first roll 1 and the fixing device 4 on the second roll 2 are away from each other to loosen the pole piece.

[0049] With such arrangement, the fixing device 4 on the first roll 1 and the fixing device 4 on the second roll 2 can act simultaneously, and compared with the form of only setting the fixing device 4 on the first roll 1, the clamping stroke and the loosening stroke of the fixing device 4 on the first roll 1 and the fixing device 4 on the second roll 2 are both shorter, so that the clamping speed and the loosening speed can be further improved. In addition, by setting the fixing device 4 on both the first roll 1 and the second roll 2, the first roll 1 and the second roll 2 of the roll are arranged symmetrically, which can ensure the dynamic balance of the winding needle and avoid the problem of vibration during the rotation of the winding needle.

[0050] In some embodiments provided by the present invention, at least two fixing devices 4 are provided on the second winding body 2, and at least two fixing devices 4 are arranged along the axial direction of the second winding body 2. It should be noted that the axial direction of the second winding body 2 is the same as the axial direction of the winding needle, and both are in the same direction as the rotation axis of the winding needle.

[0051] In this way, by providing at least two fixing devices 4 arranged along the axial direction of the second winding body 2, the at least two fixing devices 4 can disperse the pressure to the pole piece in the axial direction of the second winding body 2, thereby providing a more uniform clamping force, reducing the problem of local stress concentration, and avoiding the pole piece from being crushed or deformed excessively.

[0052] In some embodiments provided by the present invention, the electromagnet 402 includes a support frame 402a and a coil 402b wound around the outside of the support frame 402a. The support frame 402a is provided with a receiving space for the permanent magnet 401 to be placed. Optionally, the support frame 402a is configured as a hollow metal structure, for example, the metal structure is made of silicon steel sheet, soft magnetic alloy or pure iron.

[0053] In this embodiment, the support frame 402a is provided to support and fix the coil 402b. In addition, the magnetic field formed by the coil 402b can be concentrated, the magnetic force of the magnetic field can be increased, and the shape and direction of the magnetic field can be controlled, so that the magnetic field of the electromagnet 402 can better interact with the magnetic field of the permanent magnet 401.

[0054] In some embodiments provided by the present invention, the winding needle further includes a flexible pad 5 , and the movable one of the permanent magnet 401 and the electromagnet 402 is provided with the flexible pad 5 and is used to abut against the pole piece through the flexible pad 5 .

[0055] In this embodiment, the fixing device 4 abuts against the pole piece through the flexible pad 5, so that the problem of the fixing device 4 damaging the pole piece can be avoided.

[0056] Further, under the condition that the number of the fixing devices 4 on the first roll 1 is at least two, all the fixing devices 4 on the first roll 1 are connected to the same corresponding flexible pad 5. Further, under the condition that at least two fixing devices 4 are also provided on the second roll 2, all the fixing devices 4 on the second roll 2 are connected to the same corresponding flexible pad 5.

[0057] Optionally, the flexible pad 5 may be a silicone pad, a felt pad or a sponge.

[0058] refer to Figure 1-Figure 3 As shown, in some embodiments provided by the present invention, the fixing device 4 further includes a slot 403. Both the permanent magnet 401 and the electromagnet 402 are at least partially disposed in the slot 403. For example Figure 3What is shown is a schematic diagram in which the permanent magnet 401 is fixed in the slot 403 , and the electromagnet 402 is movably disposed in the slot 403 and sleeved on the outside of the permanent magnet 401 .

[0059] In this embodiment, by integrating the permanent magnet 401 and the electromagnet 402 in the slot body 403, the fixing device 4 is better integrated and the structure is more compact, and by arranging the permanent magnet 401 and the electromagnet 402 behind the slot body 403, the fixing device 4 can form an independent unit, so that the fixing device 4 can be more conveniently installed on the first roll 1 or the second roll 2, or the fixing device 4 can be removed from the first roll 1 or the second roll 2.

[0060] Further, a first installation groove is provided on one side of the first roll 1 close to the second roll 2, and the groove body 403 of the corresponding fixing device 4 is installed in the first installation groove. A second installation groove is provided on one side of the second roll 2 close to the first roll 1, and the groove body 403 of the corresponding fixing device 4 is installed in the second installation groove.

[0061] In some embodiments provided by the utility model, the fixing device 4 further includes an elastic sheet 404. The permanent magnet 401 is connected to the slot body 403. For example, the permanent magnet 401 can be connected to the slot body 403 by bonding. The electromagnet 402 is movably arranged in the slot body 403 and is sleeved on the outside of the permanent magnet 401. The elastic sheet 404 connects the electromagnet 402 and the slot body 403, and is used to keep the outer wall of the electromagnet 402 and the inner wall of the slot body 403 at a preset distance. That is, one end of the elastic sheet 404 is connected to the electromagnet 402, and the other end is connected to the slot body 403. The elastic sheet 404 is used to support the electromagnet 402 so that the outer wall of the electromagnet 402 and the inner wall of the slot body 403 maintain a preset distance.

[0062] In this embodiment, the electromagnet 402 is supported by the elastic sheet 404 so that a preset distance is maintained between the electromagnet 402 and the slot 403 to avoid friction or wear between the electromagnet 402 and the slot 403 during movement, thereby extending the service life of the electromagnet 402 and the slot 403.

[0063] Optionally, the elastic sheet 404 may be a spring sheet.

[0064] In some embodiments provided by the present invention, at least one of the first roll body 1 and the second roll body 2 includes a needle sleeve 101 and a needle body 102 sleeved on the outside of the needle sleeve 101 .

[0065] A winding device is also provided in an embodiment of the utility model.

[0066] Specifically, the winding device comprises a winding needle as described above.

[0067] It should be noted that the winding device includes a winding needle, and also includes all the above-mentioned advantages of the winding needle, which will not be repeated here.

[0068] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model 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 therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0069] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "first aspect embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A needle coil, characterized in that: include: A first coil (1), a second coil (2) and a support (3), wherein the first coil (1) and the second coil (2) are both connected to the support (3), and a gap is provided between the first coil (1) and the second coil (2) for inserting a pole piece; A fixing device (4) comprising a permanent magnet (401) and an electromagnet (402), wherein the electromagnet (402) is arranged to move closer to or farther from the permanent magnet (401) when powered on; The fixing device (4) is provided on a side of the first winding body (1) close to the second winding body (2), and one of the permanent magnet (401) and the electromagnet (402) of the fixing device (4) is connected to the first winding body (1), and the other is movably arranged in a direction approaching or moving away from the second winding body (2) so as to abut against or disengage from the pole piece.

2. The winding needle according to claim 1, characterized in that: At least two fixing devices (4) are provided on the first roll (1), and at least two fixing devices (4) are arranged along the axial direction of the first roll (1).

3. The winding needle according to claim 1, characterized in that: The fixing device (4) is also provided on a side of the second winding body (2) close to the first winding body (1), and one of the permanent magnet (401) and the electromagnet (402) of the fixing device (4) is connected to the second winding body (2), and the other is movably arranged in a direction approaching or moving away from the first winding body (1) so as to be used for contacting or disengaging with the pole piece, and the fixing device (4) on the second winding body (2) is arranged opposite to the fixing device (4) on the first winding body (1).

4. The winding needle according to claim 3, characterized in that: At least two fixing devices (4) are provided on the second roll (2), and at least two fixing devices (4) are arranged along the axial direction of the second roll (2).

5. The winding needle according to any one of claims 1 to 4, characterized in that: The electromagnet (402) comprises a support frame (402a) and a coil (402b) wound around the outside of the support frame (402a); the support frame (402a) is provided with a receiving space for the permanent magnet (401) to be placed therein.

6. The winding needle according to any one of claims 1 to 4, characterized in that: It also includes a flexible pad (5), and the movable one of the permanent magnet (401) and the electromagnet (402) is provided with the flexible pad (5) and is used to abut against the pole piece through the flexible pad (5).

7. The winding needle according to any one of claims 1 to 4, characterized in that: The fixing device (4) further comprises a slot body (403), and both the permanent magnet (401) and the electromagnet (402) are at least partially disposed in the slot body (403).

8. The winding needle according to claim 7, characterized in that: The fixing device (4) further comprises an elastic sheet (404), the permanent magnet (401) is connected to the slot body (403), the electromagnet (402) is movably arranged in the slot body (403) and sleeved on the outer side of the permanent magnet (401), and the elastic sheet (404) connects the electromagnet (402) and the slot body (403) and is used to maintain a preset distance between the outer wall of the electromagnet (402) and the inner wall of the slot body (403).

9. The winding needle according to claim 1, characterized in that: At least one of the first coil (1) and the second coil (2) comprises a needle sleeve (101) and a needle body (102) sleeved on the outside of the needle sleeve (101).

10. A winding device, characterized in that: Comprising the winding needle as described in any one of claims 1-9.

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