Hole ironing mechanism for battery roll core

Abstract

The utility model relates to the technical field of battery roll core processing, in particular to a hole ironing mechanism of a battery roll core, which comprises a hole ironing needle and a transmission mechanism, the transmission mechanism controls the hole ironing needle to move so as to iron a roll core center hole of the battery roll core, the hole ironing needle comprises a needle head and a needle body, the needle head is in an oblique cone shape, and the needle body is arranged on the needle head. And the tail part of the needle body is connected with the transmission mechanism. In order to solve the problem that in the prior art, a hole ironing mechanism is prone to deviation, and consequently a diaphragm is damaged, the shape of a hole ironing needle is improved, and a needle tip is adjusted to be in an oblique cone shape. After the roll core is fed and the protruding part of the roll core in the scattered holes is determined, the direction of the needle tip of the hole scalding needle can be adjusted, so that the needle tip of the hole scalding needle penetrates from one side far away from the protruding part of the roll core, and the problem of scalding the roll core is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core processing, in particular to a perforation mechanism for a battery core. Background Art

[0002] A battery core is a battery cell formed by winding together the positive and negative plates and separators. After being installed in a battery casing, the battery is completed by injecting electrolyte and welding the terminals. Currently, during the manufacturing process of cylindrical batteries, spot welding or terminal welding requires inserting a pin through the center hole of the core separator to meet production needs. Therefore, the center hole of the wound core separator must be heated and perforated to solidify the separator at the center hole. This ensures that the separator inside the center hole will not be damaged during the bottom welding and pin insertion processes in the subsequent steps, resulting in the core being scrapped.

[0003] In the prior art, the process of perforating the center hole of the core membrane is typically accomplished using a perforation mechanism. For example, application number CN201710874937.5 discloses a cylindrical battery core shaping device comprising a core positioning mechanism and a core shaping mechanism. The core positioning mechanism includes a perforating needle holder, within which is located a fixed guide post with a perforating needle positioning hole and a perforating needle mounting hole. The mechanism also includes a positioning pin, a positioning rotary gear, a positioning pin cylinder, and a positioning motor gear, which meshes with the positioning rotary gear. The core shaping mechanism comprises three sets of core shaping assemblies, with adjacent sets of these three sets spatially spaced at 120°. This cylindrical battery core shaping device adjusts the angular position of the perforating needles using the core positioning mechanism. The three sets of core shaping assemblies, each spaced at 120°, then shape the battery core using the three sets of core shaping assemblies, thereby achieving the desired shape and effectively improving the roundness of the battery core.

[0004] However, during actual implementation, the inventors discovered that, during the perforation process of the core, this type of technical solution, because the core's center hole size may be less affected by the reaming parameters during winding, and the core is in a loose-hole state, the perforation needle easily penetrates the center diaphragm during perforation, causing black holes or delamination of the center hole diaphragm. Existing techniques primarily focus on improving the perforation needle's position adjustment scheme, but this adjustment method requires high precision in measuring and adjusting the core's position. For example, it requires determining the core's protruding position and adjustment direction in the loose-hole state, and using a servo mechanism to precisely adjust the perforation needle in the radial direction. Consequently, the pass rate remains suboptimal. Utility Model Content

[0005] In view of the above problems existing in the prior art, a battery roll core hot-punching mechanism is now provided.

[0006] The specific technical solutions are as follows:

[0007] A perforation mechanism for a battery roll core includes a perforation needle and a transmission mechanism. The transmission mechanism controls the movement of the perforation needle to perforate the center hole of the battery roll core. The perforation needle includes a needle head and a needle body. The needle head is in an oblique cone shape, and the tail of the needle body is connected to the transmission mechanism.

[0008] On the other hand, the perforation mechanism further includes a heater, which is in the shape of a long cube and has a heater through hole in the moving direction of the perforation needle;

[0009] The perforating needle penetrates into the heater through the first end of the heater through hole and exits through the second end of the heater through hole to perform perforation on the battery coil core.

[0010] On the other hand, the transmission mechanism includes:

[0011] a first guide rail, the first guide rail being mounted on a transmission mechanism base of the transmission mechanism along a first direction;

[0012] a perforating pin mounting seat, the perforating pin mounting seat being mounted on the first guide rail and slidably connected to the first guide rail, the perforating pins being mounted along the first direction on a first side surface of the perforating pin mounting seat along the long axis direction of the first guide rail;

[0013] A screw rod, the screw rod being mounted on the transmission mechanism base along the first direction and being arranged parallel to the first guide rail;

[0014] The first end of the screw rod is connected to a driving motor, and a moving structure is slidably installed on the screw rod. The moving structure is connected to the perforating needle mounting seat to drive the perforating needle mounting seat to reciprocate along the first guide rail under the drive of the driving motor.

[0015] On the other hand, the transmission mechanism further includes a second guide rail, which is arranged parallel to the screw rod and the first guide rail;

[0016] The moving structure spans the second guide rail, and a sliding limit device is provided on a side of the moving structure facing the second guide rail;

[0017] At least one limiting block is fixed on the second guide rail, and the limiting block abuts against the sliding limiting device when the moving structure moves to a predetermined limit position.

[0018] On the other hand, the transmission mechanism base includes a first base and a second base;

[0019] The first base is in the shape of a flat plate, the second base is in the shape of an X, and the second base is installed on the first base;

[0020] The screw rod and the driving motor are mounted on the first base, the first guide rail is mounted on the upper surface of the second base, and the second guide rail is mounted on the first side surface of the second base close to the screw rod;

[0021] The moving structure is Z-shaped and extends from the first base along the first side surface of the second base to the upper surface of the second base to respectively span the lead screw, the second guide rail, and the first guide rail.

[0022] On the other hand, a heater bracket is provided on the first base, and a heater is installed above the heater bracket;

[0023] The heater bracket is arranged in an inverted T shape.

[0024] On the other hand, a buffer structure is provided between the perforating needle mounting seat and the moving structural member;

[0025] The buffer structure includes at least one set of spring guide devices arranged parallel to the first guide rail, and two ends of the spring guide device are respectively connected to the perforating needle mounting seat and the moving structural component.

[0026] On the other hand, a pair of displacement detection devices are provided above the moving structural member and the perforating needle fixing member;

[0027] The displacement detection device includes a sensor guide plate and a slot switch;

[0028] The slot switch is U-shaped, and the sensor guide plate is located in the middle of the U-shape in the front view direction;

[0029] When the relative positions of the moving structural component and the perforating needle fixing component change, the sensor guide plate extends into the slot switch.

[0030] On the other hand, the slot switch and the driving motor are respectively connected to a remote programmable logic controller.

[0031] On the other hand, the first direction is a horizontal direction or a vertical direction.

[0032] The above technical solution has the following advantages or beneficial effects:

[0033] To address the problem of misalignment in existing perforation mechanisms, which can lead to membrane damage, the present invention improves the shape of the perforation needle, adjusting the needle tip to an oblique conical shape. Once the core is loaded and the protruding portion of the core within the holes is determined, the perforation needle tip can be adjusted so that it penetrates from the side away from the protruding portion, avoiding core burns. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are for illustration and description only and are not intended to limit the scope of the present invention.

[0035] Figure 1 It is an overall schematic diagram of an embodiment of the utility model;

[0036] Figure 2 This is a schematic diagram of a perforation needle according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the transmission mechanism of an embodiment of the utility model;

[0038] Figure 4 This is a schematic diagram of the second guide rail of an embodiment of the present utility model;

[0039] Figure 5 Schematic diagram of the base of an embodiment of the present utility model.

[0040] Figure 6 This is a schematic diagram of the buffer structure of an embodiment of the present utility model. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0044] The utility model includes:

[0045] A perforation mechanism for a battery roll core includes a perforation needle 1 and a transmission mechanism 2. The transmission mechanism 2 controls the movement of the perforation needle 1 to perforate the center hole of the battery roll core. The perforation needle 1 has an eccentric needle head, including a needle head 11 and a needle body 12. The needle head 11 is in an oblique cone shape, and the tail of the needle body 12 is connected to the transmission mechanism.

[0046] In order to adjust the position of the perforating needle 1 , in one embodiment, the tail of the perforating needle 1 is connected to the transmission mechanism 2 via a rotating device, so that the perforating needle 1 rotates along the circumference of the needle body 12 .

[0047] Specifically, in order to solve the problem that the perforation mechanism in the prior art is prone to deviation and thus causes damage to the diaphragm, in this embodiment, the shape of the perforation needle is improved and adjusted to an eccentric needle structure. Figure 2 As shown, the eccentric needle includes a needle head 11 and a needle body 12. The needle head 11 is in the shape of an oblique cone, and the apex of the needle tip does not coincide with the center of the bottom circle. The length of the line connecting the apex of the needle tip and the edge of the bottom surface can be adjusted as needed. The bottom circle is connected to the needle body 12 at the rear, and its radius is the same as or slightly smaller than the radius of the needle body 12. When the radius of the bottom circle is smaller than the radius of the needle body 12, the two are connected by a frustum transition. The tail of the needle body 12 is connected to the transmission mechanism 2.

[0048] The battery core in a dispersed hole state is formed by winding, but the center hole is not completely fixed, so there may be some parts that are warped. When inserting a traditional conical perforating needle into the center hole, if the apex of the perforating needle is aligned with the center hole of the core, the warped part will be closer to the perforating needle, which will cause the problem of blackening. However, the perforating needle 1 mentioned above has an eccentric needle structure. Therefore, when inserting the core, the warped part of the core center can be pre-determined. The perforating needle 1 can then be rotated to offset the position of the cone apex, so that it can be inserted and perforated away from the warped part. This avoids the problem of blackening the core and improves product yield.

[0049] In order to achieve the avoidance of the protruding part of the center hole of the core by the needle tip of the oblique cone, the following technical means can be used:

[0050] In one embodiment, a rotating device is used to connect the needle body 12 and the transmission mechanism 2. The rotating device includes a connecting flange and a bearing embedded in the flange. The bearing penetrates the needle body 12 so that the perforating needle 1 can rotate along the circumference of the needle body 12.

[0051] In another embodiment, the entire perforation mechanism is mounted on a turntable, which can adjust the posture of the entire perforation mechanism along the circumference of the needle body 12, thereby changing the position of the needle tip.

[0052] In addition, in some embodiments, the above-mentioned perforation mechanism can be combined with a radial adjustment scheme. For example, after determining the protrusion of the core, the height and left and right position of the perforation mechanism are adjusted by the linear motor in the XY direction, so that the perforation needle 1 is displaced along the radial direction of the needle body 12, and further coordinated with the circumferential rotation to achieve a better avoidance effect.

[0053] In one embodiment, Figure 3 As shown, the transmission mechanism 2 includes:

[0054] A first guide rail 21, the first guide rail 21 is installed on the transmission mechanism base of the transmission mechanism 2 along a first direction;

[0055] The perforating needle mounting seat 22 is mounted on the first guide rail 21 and is slidably connected to the first guide rail 21. The perforating needle mounting seat 22 is provided with a rotating device along a first direction on a first side surface along the long axis direction of the first guide rail 21;

[0056] The screw rod 23 is mounted on the transmission mechanism base along a first direction, and the screw rod 23 is arranged parallel to the first guide rail 21;

[0057] The first end of the screw rod 23 is connected to the driving motor 24, and a moving structure 25 is slidably installed on the screw rod 23. The moving structure 25 is connected to the ironing needle mounting seat 22 to drive the ironing needle mounting seat 22 to reciprocate along the first guide rail under the drive of the driving motor 24.

[0058] Specifically, to achieve a better perforation effect, in this embodiment, a first guide rail 21 and a screw rod 23 are arranged in parallel in the transmission mechanism 2. The first guide rail 21 is used to support the perforation needle 1 through the perforation needle mounting seat 22. The bottom of the perforation needle mounting seat 22 is provided with a corresponding slide structure to ensure that the perforation needle 1 remains parallel to the first guide rail 21.

[0059] Driven by the drive motor 24, the screw rod 23 rotates forward and reverse. The moving structure 25 is threadedly connected to the screw rod 23. When the screw rod 23 rotates, the threads push the moving structure 25 to slide along the screw rod 23, thereby driving the perforating needle mounting base 22 and the perforating needle 1 on the other side to slide along the first guide rail 1. Before the drive motor 24 drives the perforating needle 1 toward the winding core, the center hole of the winding core should be inspected, the protruding position determined, and the rotating device adjusted.

[0060] In one embodiment, Figure 4 As shown, the transmission mechanism 2 further includes a second guide rail 26, which is arranged parallel to the screw rod 23 and the first guide rail 21;

[0061] The moving structure 25 spans the second guide rail, and a sliding limit device 251 is provided on the side of the moving structure 25 facing the second guide rail 26;

[0062] At least one limiting block 261 is fixed on the second guide rail 2 , and the limiting block 261 abuts against the sliding limiting device 251 when the moving structure 25 moves to a predetermined limit position.

[0063] Specifically, in order to avoid the problem that the perforating needle 1 is too far inserted into the roll core, causing the edge to be too close to the inner wall of the roll core and thus burning the inner wall of the roll core, a second guide rail 26 for limiting is provided in this embodiment. At least one set of limit blocks 261 is provided on the second guide rail 26 according to the predetermined processing position of the perforating needle 1, which is used to limit the farthest limit distance and / or the closest limit position of the perforating needle 1. The limiting process is achieved by cooperating with the sliding limit device 251, which is provided on the side of the moving structure 25 facing the second guide rail 26. When moving to the predetermined limit position, the limit block 261 will abut against the sliding limit device 251 to achieve limiting. Under normal circumstances, the drive motor 24 will trigger an overload alarm at this time, thereby causing the drive motor 24 to stop or reverse.

[0064] It should be noted that the relative positions between the first guide rail 21, the second guide rail 26 and the screw rod 23 can be adjusted arbitrarily. It is only necessary to adaptively adjust the shape of the moving structure 25 and the position of the sliding limit device 251, and make the first guide rail 21, the second guide rail 26 and the screw rod 23 have a parallel relationship.

[0065] The first direction is a horizontal direction or a vertical direction, which can also be adjusted according to production equipment.

[0066] In one embodiment, Figure 5 As shown, the transmission mechanism base includes a first base 27 and a second base 28;

[0067] The first base 27 is in the shape of a flat plate, and the second base 28 is in the shape of a cross. The second base 28 is installed on the first base 27;

[0068] The screw rod 23 and the drive motor 24 are mounted on the first base 27 , the first guide rail 21 is mounted on the upper surface of the second base 28 , and the second guide rail 26 is mounted on the first side surface of the second base 28 close to the screw rod 24 ;

[0069] The moving structure 25 is Z-shaped and extends from the first base 27 along the first side surface of the second base 28 to the upper surface of the second base 28 to respectively cross the lead screw 23 , the second guide rail 26 and the first guide rail 21 .

[0070] Specifically, to achieve a more compact device structure, in this embodiment, the first base 27 and the second base 28 are provided so that the screw rod 23, the second guide rail 26, and the first guide rail 21 are located on different planes, thereby reducing the overall projected area of ​​the device. The dimensions of the first and second bases 27 and 28 and the specifications of the moving structure 25 can be adaptively adjusted as needed, so that the screw rod 23, the second guide rail 26, and the first guide rail 21 can only perform their corresponding functions.

[0071] In one embodiment, the perforation mechanism further includes a heater 4, which is in the shape of a long cube and has a heater through hole 41 formed in the moving direction of the perforation needle.

[0072] The perforating needle 1 penetrates the heater 4 through the first end of the heater through hole 41 and exits through the second end of the heater through hole 41 to perform perforation on the battery coil core.

[0073] Specifically, to achieve optimal perforation results, this embodiment incorporates a heater 4 within the perforation mechanism. This heater 4 houses a heating wire wrapped around the inner wall of the heater's through-hole 41. A perforation needle 1 penetrates the heater 4 through the first end of the heater's through-hole 41 and exits through the second end. The needle body, located within the heater's through-hole 41, is heated by the heating wire, while the needle tip, exposed through the heater's through-hole 41, is heated by heat conduction. The core is loaded outside the second end of the heater's through-hole 41, and driven by the drive motor 24, the perforation needle 1 penetrates the core to effect the perforation.

[0074] In one embodiment, a heater bracket 41 is provided on the first base, and a heater 4 is installed above the heater bracket 41;

[0075] The heater bracket 41 is arranged in an inverted T shape.

[0076] Specifically, in order to achieve adaptation to the first base and the second base, a heater bracket 41 is also provided in this embodiment to cooperate with the heater 4, raising the heater 4 so that the heater through hole 41 and the perforating needle 1 are at the same height, and a better supporting effect is achieved through the inverted T-shaped heater bracket 41.

[0077] In one embodiment, Figure 6 As shown, a buffer structure 5 is provided between the perforating needle mounting seat 22 and the moving structural member 25;

[0078] The buffer structure 5 includes at least one set of spring guide devices 51 arranged parallel to the first guide rail 21 , and two ends of the spring guide device 51 are respectively connected to the perforating needle mounting seat 22 and the moving structure 25 .

[0079] Specifically, in order to prevent the perforating needle 1 from directly hitting the inner wall of the coil core or other production equipment and causing damage, in this embodiment, a buffer structure 5 is provided between the perforating needle mounting seat 22 and the moving structural member 25. When the perforating needle 1 collides with an external device, the impact force is absorbed by the contraction of the buffer structure 5, thereby avoiding damage to the device.

[0080] The buffer structure 5 includes at least one set of spring guides 51 arranged parallel to the first guide rail 21. The spring guides consist of an external spring and a guide rod inserted into the spring. One end of the guide rod is fixed to the pin mount 22 or the moving structure 25, while the other end is inserted into a guide hole in the moving structure 25 or the pin mount 22, allowing free movement within the guide hole. The two ends of the spring are respectively connected to the pin mount 22 and the moving structure 25, maintaining a certain degree of compression to transmit the force acting on the moving structure 25. In some embodiments, the guide rods can be replaced with damping devices to prevent device vibration or positional deviation of the pins 1.

[0081] In one embodiment, Figure 6 As shown, a pair of displacement detection devices 6 are provided above the moving structural member 25 and the perforating needle fixing member;

[0082] The displacement detection device 6 includes a sensor guide plate 61 and a slot switch 62;

[0083] The slot switch 62 is U-shaped, and the sensor guide plate 61 is located in the middle of the U-shape in the front view direction;

[0084] When the relative positions of the moving structure 25 and the perforating needle fixing member 22 change, the sensor guide plate 61 extends into the slot switch 62 .

[0085] The slot switch 62 and the drive motor 24 are respectively connected to a remote programmable logic controller.

[0086] Specifically, to prevent the perforating needle 1 from directly striking the inner wall of the coil core or other production equipment, causing damage, this embodiment also includes a pair of displacement detection devices 6 positioned above the moving structure 25 and the perforating needle fixture. These devices include a sensor guide plate 61 and a slot switch 62, one of which is positioned on the moving structure 25 and the other on the perforating needle fixture 22, with their mounting positions matching each other. Normally, the sensor guide plate 61 is located outside the slot switch 62 and does not extend into the slot switch 62 during normal movement of the perforating needle 1. Only when the perforating needle 1 strikes an external object and the buffer structure 5 is compressed does the sensor guide plate 61 extend into the slot switch 62, generating an electrical signal.

[0087] After the electrical signal is captured by the remote programmable logic controller, the drive motor 24 can be controlled to stop and reverse, thereby avoiding damage.

[0088] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery core perforation mechanism, comprising a perforation needle and a transmission mechanism, wherein the transmission mechanism controls the movement of the perforation needle to perforate the center hole of the battery core, characterized in that: The perforation needle includes a needle head and a needle body, the needle head is in an oblique cone shape, and the tail of the needle body is connected to the transmission mechanism through a rotating device; The perforation mechanism further includes a heater, wherein the heater is provided with a heater through hole in the moving direction of the perforation needle; The perforating needle penetrates the heater through the first end of the heater through hole and exits through the second end of the heater through hole to perforate the battery coil core; The transmission mechanism is used to drive the perforation needle to move back and forth along the direction of the battery coil core.

2. The perforation mechanism according to claim 1, characterized in that: The heater is in the shape of an elongated cube.

3. The perforation mechanism according to claim 1, characterized in that: The transmission mechanism comprises: a first guide rail, the first guide rail being mounted on a transmission mechanism base of the transmission mechanism along a first direction; a perforating pin mounting seat, the perforating pin mounting seat being mounted on the first guide rail and slidably connected to the first guide rail, the perforating pins being mounted along the first direction on a first side surface of the perforating pin mounting seat along the long axis direction of the first guide rail; A screw rod, the screw rod being mounted on the transmission mechanism base along the first direction and being arranged parallel to the first guide rail; The first end of the screw rod is connected to a driving motor, and a moving structure is slidably installed on the screw rod. The moving structure is connected to the perforating needle mounting seat to drive the perforating needle mounting seat to reciprocate along the first guide rail under the drive of the driving motor.

4. The perforation mechanism according to claim 3, characterized in that: The transmission mechanism further includes a second guide rail, which is arranged parallel to the screw rod and the first guide rail; The moving structure spans the second guide rail, and a sliding limit device is provided on a side of the moving structure facing the second guide rail; At least one limiting block is fixed on the second guide rail, and the limiting block abuts against the sliding limiting device when the moving structure moves to a predetermined limit position.

5. The perforation mechanism according to claim 4, characterized in that: The transmission mechanism base includes a first base and a second base; The first base is in the shape of a flat plate, the second base is in the shape of an X, and the second base is installed on the first base; The screw rod and the driving motor are mounted on the first base, the first guide rail is mounted on the upper surface of the second base, and the second guide rail is mounted on the first side surface of the second base close to the screw rod; The moving structure is Z-shaped and extends from the first base along the first side surface of the second base to the upper surface of the second base to respectively span the lead screw, the second guide rail, and the first guide rail.

6. The perforation mechanism according to claim 5, characterized in that: A heater bracket is provided on the first base, and a heater is installed above the heater bracket; The heater bracket is arranged in an inverted T shape.

7. The perforation mechanism according to claim 3, characterized in that: A buffer structure is provided between the perforating needle mounting seat and the moving structural member; The buffer structure includes at least one set of spring guide devices arranged parallel to the first guide rail, and two ends of the spring guide device are respectively connected to the perforating needle mounting seat and the moving structural component.

8. The perforation mechanism according to claim 7, characterized in that: A pair of displacement detection devices are provided above the moving structural member and the perforating needle fixing member; The displacement detection device includes a sensor guide plate and a slot switch; The slot switch is U-shaped, and the sensor guide plate is located in the middle of the U-shape in the front view direction; When the relative positions of the moving structural component and the perforating needle fixing component change, the sensor guide plate extends into the slot switch.

9. The perforation mechanism according to claim 8, characterized in that: The slot switch and the driving motor are respectively connected to a remote programmable logic controller.

10. The perforation mechanism according to claim 3, characterized in that: The first direction is a horizontal direction or a vertical direction.

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