Winding needle mechanism and winding device

Abstract

The invention relates to the technical field of battery production equipment, and particularly discloses a winding needle mechanism which comprises a shaft body, an air inlet pipe, a ventilation pipe and a plurality of reducing winding needle modules, and one end of the air inlet pipe extends to the inner side of the shaft body; the ventilation pipe is communicated with the air inlet pipe, and the ventilation pipe is arranged on the inner side of the shaft body in the radial direction of the shaft body; the variable-diameter winding needle modules are arranged at intervals in the circumferential direction of the shaft body, each variable-diameter winding needle module comprises a driving unit and a winding needle unit, the driving units are arranged on the inner side of the shaft body and connected with the ventilation pipe, and the winding needle units are arranged on the outer side of the shaft body and connected with the ventilation pipe. The winding needle unit is connected with the driving unit, and the driving unit is configured to be capable of driving the winding needle unit to move in the radial direction of the shaft body. The invention further discloses a winding device. The actual perimeter of the winding needle unit can be adjusted to meet the requirements of winding cores with different sizes, and the cost is reduced.

Description

Technical Field

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

[0002] At present, there are two ways to make the core of lithium-ion batteries according to the assembly process: lamination and winding. The winding method has high process efficiency and less die-cutting edges. Most square aluminum shell batteries are prepared by winding. The core is made by a winding machine. The core sizes corresponding to square aluminum shells of different thicknesses and widths are different. The core design needs to match the size of the square aluminum shell.

[0003] The size of the winding needle corresponding to the size of the winding core is different. The circumference of the winding needle is designed to make a mold to make a winding needle with a fixed circumference. The circumference of the produced winding needle is fixed, and the circumference can only be fine-tuned by gaskets or Teflon. It is difficult to adjust the circumference of the winding needle drastically. Winding cores of different thicknesses and widths require multiple sets of winding needles of corresponding sizes, which cannot meet usage requirements. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to solve the problem that the prior art cannot meet the requirements of winding cores of different sizes due to the use of fixed-length winding needles.

[0005] In order to solve the above technical problems, the present invention provides a needle winding mechanism, comprising:

[0006] Axis body;

[0007] An air intake pipe, one end of which extends to the inner side of the shaft body;

[0008] a vent pipe, the vent pipe being in communication with the air inlet pipe and being arranged inside the shaft body along the radial direction of the shaft body; and

[0009] A plurality of variable diameter winding needle modules are arranged at intervals along the circumference of the shaft body, each of the variable diameter winding needle modules includes a driving unit and a winding needle unit, the driving unit is arranged on the inner side of the shaft body and the driving unit is connected to the ventilation pipe, the winding needle unit is arranged on the outer side of the shaft body and the winding needle unit is connected to the driving unit, and the driving unit is configured to drive the winding needle unit to move radially along the shaft body.

[0010] Further preferably, a main air inlet is provided at one end of the air inlet pipe, and the main air inlet is configured to be connected to an air source, and a three-way joint is provided at the other end of the air inlet pipe, and the ventilation pipe is connected to the three-way joint.

[0011] Further preferably, the driving unit comprises:

[0012] A shell, the shell is connected to the vent pipe, an air bag is arranged in the shell, and the air bag is communicated with the vent pipe;

[0013] a movable seat, the movable seat being disposed in the housing and being capable of sliding along the radial direction of the shaft; and

[0014] A movable rod, one end of which is connected to the movable seat, and the other end of which extends to the outside of the shaft body along the radial direction of the shaft body, and the needle winding unit is connected to the movable rod.

[0015] Further preferably, the driving unit further comprises a needle winding seat, the needle winding seat is connected to one end of the movable rod extending out of the outer side of the shaft body, and the needle winding unit is mounted on the needle winding seat.

[0016] Further preferably, the needle winding seat and the needle winding unit are both arc-shaped structures, and the total thickness r of the needle winding seat and the needle winding unit in the radial direction satisfies: 5mm≤r≤8mm.

[0017] Further preferably, the driving unit further comprises a guide member, wherein the guide member is disposed inside the shell, the movable seat is connected to the guide member, and the guide member is configured to enable the movable seat to move radially along the shaft body.

[0018] Further preferably, the driving unit also includes an elastic member, a groove is provided at one end of the movable seat away from the airbag, the elastic member is arranged in the groove, and one end of the elastic member abuts against the inner wall of the shell, and the elastic member is configured to drive the movable seat to move along the radial direction of the shaft body away from the winding needle unit.

[0019] Further preferably, the extendable length H of the movable rod along the radial direction of the shaft body satisfies: 20mm≤H≤25mm.

[0020] Further preferably, the radial wall thickness T of the shaft body satisfies: 4mm≤T≤7mm, and the outer diameter R of the shaft body satisfies: 25mm≤R≤27mm.

[0021] The present invention also provides a winding device, comprising a winding mechanism, an air source and the above-mentioned winding needle mechanism; the winding needle mechanism is connected to the winding mechanism, and the air source is connected to the air inlet pipe.

[0022] Compared with the prior art, the present invention provides a needle winding mechanism and a winding device, which have the following beneficial effects:

[0023] The present invention can control the push-out stroke of the driving unit by setting an air inlet pipe and a ventilation pipe, thereby adjusting the actual circumference of the winding needle unit, and through multiple variable diameter winding needle modules are connected to the ventilation pipe, the adjustment synchronization of multiple winding needle units can be achieved, thereby reducing the adjustment error, improving the accuracy, and having strong versatility. The winding needle mechanism of the present application can meet the needs of winding cores of different sizes, and there is no need to design multiple sets of winding needles of corresponding sizes, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a needle winding mechanism described in Example 1 of the present invention.

[0025] Reference numerals:

[0026] 10. Axis;

[0027] 20. Inlet pipe; 21. Main air inlet; 22. Three-way connector; 23. Ventilation pipe;

[0028] 30. Variable diameter needle winding module; 31. Shell; 32. Movable seat; 33. Air bag; 34. Movable rod; 35. Needle winding seat; 36. Needle winding unit; 37. Guide member; 38. Groove; 39. Elastic member. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a needle winding mechanism, which is an axisymmetric structure. Figure 1 Shown is one half of the needle winding mechanism.

[0037] In a specific embodiment, the needle winding mechanism includes a shaft body 10, which is a circular tube structure with a hollow interior. In order to ensure that the shaft body 10 has a certain strength and does not deform, the radial wall thickness T of the shaft body 10 is limited to meet the following conditions: 4mm≤T≤7mm.

[0038] In some embodiments, the radial wall thickness T of the shaft body 10 is preferably 5 mm.

[0039] In some embodiments, the needle winding mechanism also includes an air inlet pipe 20, a ventilation pipe 23 and a plurality of variable diameter needle winding modules 20, wherein one end of the air inlet pipe 20 extends to the inner side of the shaft body 10; the ventilation pipe 23 is connected to the air inlet pipe 20, and the ventilation pipe 23 is arranged on the inner side of the shaft body 10 along the radial direction of the shaft body 10; and the plurality of variable diameter needle winding modules 20 are arranged at circumferential intervals along the shaft body 10.

[0040] In some embodiments, the number of the variable diameter winding needle modules 20 is preferably 6, and the angle formed by two adjacent variable diameter winding needle modules 20 relative to the axis of the shaft body 10 is 60°.

[0041] In some embodiments, each variable diameter winding needle module 20 includes a driving unit and a winding needle unit 36, wherein the driving unit is disposed inside the shaft body 10 and connected to the vent pipe 23, and the winding needle unit 36 ​​is disposed outside the shaft body 10 and connected to the driving unit, and the driving unit is configured to drive the winding needle unit 36 ​​to move radially along the shaft body 10. Thus, by providing the air inlet pipe 20 and the vent pipe 23, the pushing stroke of the driving unit can be controlled, thereby adjusting the actual circumference of the winding needle unit 36, and by connecting multiple variable diameter winding needle modules 20 to the vent pipe 23, the adjustment synchronization of multiple winding needle units 36 can be achieved, thereby reducing the adjustment error, improving the accuracy, and having strong versatility. The winding needle mechanism of the present application can meet the requirements of winding cores of different sizes, without the need to design multiple sets of winding needles of corresponding sizes, thereby reducing costs.

[0042] In some embodiments, a main air inlet 21 is provided at one end of the air inlet pipe 20, wherein the main air inlet 21 is configured to be connected to an air source, and a three-way joint 22 is provided at the other end of the air inlet pipe 20, and the vent pipe 23 is connected to the three-way joint 22. Preferably, when there are six variable diameter winding needle modules 20, the air inlet pipe 20 can be provided with two three-way joints 22 to meet the connection of the six variable diameter winding needle modules 20, so as to achieve the adjustment synchronization of multiple winding needle units 36, thereby reducing the adjustment error and improving the accuracy.

[0043] In some embodiments, the driving unit includes a shell 31, a movable seat 32 and a movable rod 34, wherein the shell 31 is connected to the ventilation pipe 23, an airbag 33 is provided in the shell 31, and the airbag 33 is connected to the ventilation pipe 23; the movable seat 32 is provided in the shell 31, and the movable seat 32 can slide along the radial direction of the shaft body 10; one end of the movable rod 34 is connected to the movable seat 32, and the other end extends to the outside of the shaft body 10 along the radial direction of the shaft body 10, and the winding needle unit 36 ​​is connected to the movable rod 34; in this way, the pressure in the airbag 33 can be adjusted in real time through the air inlet pipe 20 and the ventilation pipe 23, so that the movable seat 32 can be pushed to move along the radial direction of the shaft body 10, thereby pushing out or retracting the winding needle unit 36, and then increasing or reducing the actual circumference to meet the requirements of winding cores of different sizes.

[0044] In some embodiments, in order to ensure the connection stability and force balance between the shaft body 10 and the movable rod 34, the driving unit also includes a needle winding seat 35, which is connected to the end of the movable rod 34 extending out of the outside of the shaft body 10, and the needle winding unit 36 ​​is installed on the needle winding seat 35. By setting the needle winding seat 35, the connection stability and force balance between the shaft body 10 and the movable rod 34 can be improved.

[0045] In some embodiments, the needle holder 35 and the needle unit 36 ​​are both arc-shaped structures to meet the requirements of winding cores of different sizes. The total thickness r of the needle holder 35 and the needle unit 36 ​​in the radial direction satisfies: 5mm≤r≤8mm, preferably r=6mm.

[0046] In some embodiments, in order to ensure that the movable seat 32 always moves along the radial direction of the shaft body 10, the driving unit also includes a guide member 37, and the guide member 37 is arranged on the inner side of the shell 31. The movable seat 32 is connected to the guide member 37, and the guide member 37 is configured to enable the movable seat 32 to move along the radial direction of the shaft body 10, thereby ensuring the flexibility and accuracy of the movement of the movable seat 32 and ensuring the quality of the core processing.

[0047] In some embodiments, the guide member 37 is a roller.

[0048] In other embodiments, the guide member 37 is a slider, and a slide rail is provided on the inner wall of the housing 31, and the slider slidably cooperates with the slide rail.

[0049] In some embodiments, when the actual circumference needs to be reduced, the pressure inside the airbag 33 is reduced. In order to allow the winding needle unit 36 ​​to retract, the driving unit also includes an elastic member 39. A groove 38 is provided at the end of the movable seat 32 away from the airbag 33. The elastic member 39 is disposed in the groove 38, and one end of the elastic member 39 abuts against the inner wall of the shell 31. The elastic member 39 is configured to drive the movable seat 32 to move along the radial direction of the shaft body 10 away from the winding needle unit 36. When the pressure inside the airbag 33 is reduced and is less than the elastic force of the elastic member 39, the elastic member 39 pushes the movable seat 32 to retract along the radial direction of the shaft body 10, thereby driving the winding needle unit 36 ​​to retract and reduce the actual circumference.

[0050] In some embodiments, the elastic member 39 is a compression spring to ensure that the winding needle unit 36 ​​can be adjusted by adjusting the pressure in the airbag 33, thereby changing the actual circumference to meet the winding core requirements.

[0051] In some embodiments, according to the minimum 27148 series and the maximum 71174 square aluminum shell battery cell design, the circumference of the winding needle can be controlled in the range of 200-300mm according to the design of such battery cells, which can be adapted to such square aluminum shell batteries; the minimum radius of the winding needle mechanism is R+r, and the minimum circumference is 2π×(R+r), and the air pressure of the airbag 33 can be controlled through the total air inlet 21. The radial length of the movable rod 34 is H, which can be designed according to actual needs, and the maximum circumference is 2π×(R+r+HT).

[0052] In some embodiments, the outer diameter R of the shaft 10 satisfies: 25mm≤R≤27mm; based on the minimum circumference of the needle winding mechanism of 200mm, R+r=31.847mm, T is fixed to 5mm, r is fixed to 6mm, and R is 25.847mm. In order to ensure structural strength, R is designed to be 25.5mm.

[0053] In some embodiments, the radially extendable length H of the movable rod 34 along the shaft body 10 satisfies: 10mm≤H≤15mm; calculated based on the maximum circumference of the winding needle being 300mm, based on R=25.5mm, T is fixed at 5mm, r is fixed at 6mm, and H is calculated to be 11.27mm. In order to reduce the error, H is designed to be 11.5mm.

[0054] Example 2

[0055] This embodiment provides a winding device, including a winding mechanism, an air source, and the winding needle mechanism of embodiment 1; the winding needle mechanism is connected to the winding mechanism, and the air source is connected to the air inlet pipe 20.

[0056] In summary, the embodiments of the present invention provide a needle winding mechanism and a winding device, which can control the pushing stroke of the driving unit by setting the air inlet pipe 20 and the ventilation pipe 23, so as to adjust the actual circumference of the needle winding unit 36, and through multiple variable diameter needle winding modules 20 are connected with the ventilation pipe 23, the adjustment synchronization of multiple needle winding units 36 can be achieved, thereby reducing the adjustment error, improving the accuracy, and having strong versatility. The needle winding mechanism of the present application can meet the requirements of winding cores of different sizes, and there is no need to design multiple sets of winding needles of corresponding sizes, thereby reducing costs.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A needle winding mechanism, characterized in that: include: Axis body; An air intake pipe, one end of which extends to the inner side of the shaft body; a vent pipe, the vent pipe being in communication with the air inlet pipe and being arranged inside the shaft body along the radial direction of the shaft body; and A plurality of variable diameter winding needle modules are arranged at intervals along the circumference of the shaft body, each of the variable diameter winding needle modules includes a driving unit and a winding needle unit, the driving unit is arranged on the inner side of the shaft body and the driving unit is connected to the ventilation pipe, the winding needle unit is arranged on the outer side of the shaft body and the winding needle unit is connected to the driving unit, and the driving unit is configured to drive the winding needle unit to move radially along the shaft body.

2. A needle winding mechanism according to claim 1, characterized in that: A main air inlet is provided at one end of the air inlet pipe, and the main air inlet is configured to be connected to an air source. A three-way joint is provided at the other end of the air inlet pipe, and the ventilation pipe is connected to the three-way joint.

3. A needle winding mechanism according to claim 1, characterized in that: The driving unit comprises: A shell, the shell is connected to the vent pipe, an air bag is arranged in the shell, and the air bag is communicated with the vent pipe; a movable seat, the movable seat being disposed in the housing and being capable of sliding along the radial direction of the shaft; and A movable rod, one end of which is connected to the movable seat, and the other end of which extends to the outside of the shaft body along the radial direction of the shaft body, and the needle winding unit is connected to the movable rod.

4. A needle winding mechanism according to claim 3, characterized in that: The driving unit further comprises a needle winding seat, the needle winding seat is connected to an end of the movable rod extending out of the outer side of the shaft body, and the needle winding unit is mounted on the needle winding seat.

5. A needle winding mechanism according to claim 4, characterized in that: The needle winding seat and the needle winding unit are both arc-shaped structures, and the total thickness r of the needle winding seat and the needle winding unit in the radial direction satisfies: 5mm≤r≤8mm.

6. A needle winding mechanism according to claim 3, characterized in that: The driving unit further comprises a guide member, wherein the guide member is arranged inside the housing, the movable seat is connected to the guide member, and the guide member is configured to enable the movable seat to move along the radial direction of the shaft body.

7. The needle winding mechanism according to claim 3, characterized in that: The driving unit also includes an elastic member, a groove is provided at one end of the movable seat away from the airbag, the elastic member is arranged in the groove, and one end of the elastic member abuts against the inner wall of the shell, and the elastic member is configured to drive the movable seat to move along the radial direction of the shaft body away from the winding needle unit.

8. The needle winding mechanism according to claim 3, characterized in that: The movable rod may extend by a length H along the radial direction of the shaft body that satisfies: 20 mm ≤ H ≤ 25 mm.

9. The needle winding mechanism according to claim 1, characterized in that: The radial wall thickness T of the shaft body satisfies: 4mm≤T≤7mm, and the outer diameter R of the shaft body satisfies: 25mm≤R≤27mm.

10. A winding device, comprising a winding mechanism, an air source and a winding needle mechanism as claimed in any one of claims 1 to 9; the winding needle mechanism is connected to the winding mechanism, and the air source is connected to the air inlet pipe.

Images