Hole ironing mechanism for battery cell diaphragm

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell diaphragm hole scalding mechanism which not only can prevent a scalding needle from stabbing a diaphragm, but also can ensure the hole scalding effect. The battery cell diaphragm hole ironing mechanism comprises an ironing needle, a driving module and a heating module. The ironing needle comprises a connecting shaft and a plurality of hot ironing parts connected to the connecting shaft, the multiple hot ironing parts are evenly distributed in the circumferential direction of the connecting shaft, and a cylinder structure coaxial with the connecting shaft is defined by the multiple hot ironing parts. The driving module is connected to the blanching parts and used for driving the blanching parts to synchronously move relative to the connecting shaft in the radial direction of the connecting shaft so as to change the diameter of the cylinder structure defined by the multiple blanching parts. The heating module is used for heating all the hot ironing parts so as to change the temperature of the hot ironing parts.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell separator hot-drilling mechanism. Background Technology

[0002] During the production of cylindrical battery cells, when welding the cover plate, a support rod is needed to pass through the central hole to support the cover plate and complete the welding. After the cylindrical battery cell is wound, the inner diaphragm is in a relatively free state, and part of the inner diaphragm may extend into the space of the central hole. If the support rod is then passed through the central hole, the diaphragm will obstruct its passage, potentially causing damage to the diaphragm or preventing the support rod from passing through the central hole.

[0003] To address these issues, currently, after the cylindrical battery cell is wound, a heating pin is inserted into the center hole of the cell to heat-set the inner separator, allowing the subsequent support rod to pass through smoothly. However, since the center hole size varies between different cylindrical battery cell models, while the current heating pin has a fixed size, when using the heating pin to shape the separator, if the pin diameter is too large, it can easily puncture the separator during insertion into the cell's center hole; if the pin diameter is too small, it will affect the heat-setting effect. Summary of the Invention

[0004] This invention provides a cell separator hot-drilling mechanism. By changing the diameter of the hot-drilling needle, not only can the hot-drilling needle be avoided from puncturing the separator, but the hot-drilling effect can also be guaranteed.

[0005] This utility model provides a hot-hole heating mechanism for battery cell separators, including a hot-hole heating needle, a drive module, and a heating module;

[0006] The hot iron includes a connecting shaft and a plurality of hot ironing parts connected to the connecting shaft. The plurality of hot ironing parts are evenly distributed around the circumference of the connecting shaft, and the plurality of hot ironing parts are arranged to form a cylindrical structure coaxial with the connecting shaft.

[0007] The drive module is connected to each of the hot ironing parts. The drive module is used to drive each of the hot ironing parts to move synchronously along the connecting shaft relative to the connecting shaft, so as to change the diameter of the cylindrical structure formed by the plurality of hot ironing parts.

[0008] The heating module is used to heat each of the hot-scalding parts to change the temperature of the hot-scalding parts.

[0009] The battery cell separator hot-pressing mechanism provided by this utility model designs the hot-pressing needle as a split structure with multiple hot-pressing parts. Each hot-pressing part is connected to a connecting shaft and can move radially relative to the connecting shaft. The heating module can heat the hot-pressing parts, raising their temperature to a preset temperature. Before the hot-pressing needle enters the center hole of the battery cell, the hot-pressing part can be moved radially closer to the connecting shaft to reduce the diameter of the hot-pressing needle. Then, the hot-pressing needle in this state can pass through the center hole of the battery cell. During this process, because the diameter of the hot-pressing needle is small, it will not puncture the separator. After the hot-pressing needle enters the center hole of the battery cell, the hot-pressing part can be driven to move radially away from the connecting shaft to increase the diameter of the hot-pressing needle, ensuring that the hot-pressing needle can fully contact the separator in the center hole to complete the hot-pressing. Therefore, the battery cell separator hot-pressing mechanism of this utility model, using a hot-pressing needle with a variable diameter, not only avoids puncturing the separator when entering the center hole of the battery cell but also ensures the hot-pressing effect. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a structure of the cell separator hot-hole mechanism in an embodiment of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of an ironing needle in an embodiment of this utility model;

[0012] Figure 3a This is a schematic diagram of a state where the diameter of the heating needle is small in an embodiment of this utility model;

[0013] Figure 3b This is a schematic diagram of a state after the diameter of the heating needle is increased in an embodiment of this utility model;

[0014] Figure 4 This is another perspective view of the hot-pressing needle in an embodiment of this utility model;

[0015] Figure 5 This is a schematic diagram of a structure in which the thermal resistance wire is arranged in the hot-heating section according to an embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of the structure of the heat preservation device in an embodiment of this utility model.

[0017] In the picture:

[0018] 10-Battery cell; 11-Center hole; 100-Hot iron needle; 110-Connecting shaft; 120-Hot ironing part; 130-Connecting rod; 200-Drive module; 210-Rotating structure; 211-Arc-shaped hole; 220-Second gear; 300-Heating module; 310-Thermal resistance wire; 400-Insulation equipment; 410-Insulation cavity; 420-Heating module; 430-Temperature sensor. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] refer to Figure 1 and Figure 2 The cell separator hot-drilling mechanism in this embodiment of the utility model may include a hot-drilling needle 100, a driving module 200, and a heating module 300. The hot-drilling needle 100 may include a connecting shaft 110 and a plurality of hot-drilling parts 120 connected to the connecting shaft 110. The plurality of hot-drilling parts 120 are evenly distributed circumferentially around the connecting shaft 110. Each hot-drilling part 120 has an arc-shaped structure in a cross-section perpendicular to the axis of the connecting shaft 110, so that the plurality of hot-drilling parts 120 can be arranged to form a cylindrical structure coaxially arranged with the connecting shaft 110.

[0021] A drive module 200 is connected to each heating element 120. The drive module 200 can be used to drive each heating element 120 to move synchronously along the connecting shaft 110 relative to the connecting shaft 110, thereby causing the heating elements 120 to move closer to or further away from the connecting shaft 110 along the radial direction of the connecting shaft 110. When the distance between the heating elements 120 and the connecting shaft 110 changes, it means that the diameter of the cylindrical structure formed by the multiple heating elements 120 changes, that is, the diameter of the heating needle 100 changes.

[0022] It is worth mentioning that, in this embodiment, reference Figure 3a and Figure 3b Since the circumferential dimension of the hot-pressing part 120 on the connecting shaft 110 is constant, the distance between adjacent hot-pressing parts 120 and the connecting shaft 110 changes accordingly. When the distance between the hot-pressing part 120 and the connecting shaft 110 increases, the diameter of the cylindrical structure formed by the multiple hot-pressing parts 120 increases, and the distance between adjacent hot-pressing parts 120 increases. In other words, the cylindrical structure formed by the multiple hot-pressing parts 120 is not closed in the circumferential direction of the connecting shaft 110. This prevents adjacent hot-pressing parts 120 from squeezing each other and deforming when the hot-pressing parts 120 approach the connecting shaft 110 radially.

[0023] The heating module 300 can be used to heat each of the hot-heating parts 120 to change the temperature of the hot-heating parts 120 so that the surface temperature of the hot-heating parts 120 can meet the requirements for hot-heating the battery cell 10.

[0024] In this embodiment, when the battery cell diaphragm hot-drilling mechanism hot-drills the battery cell 10, it can first move each hot-drilling part 120 toward the connecting shaft 110, so that the diameter of the hot-drilling needle 100 is reduced (e.g., Figure 3a (As shown in the diagram). After inserting the smaller diameter heating pin 100 into the center hole 11 of the battery cell 10, each heating part 120 is moved away from the connecting shaft 110, thereby increasing the diameter of the heating pin 100 (e.g., ...). Figure 3b (As shown in the diagram), the heating pin 100 is used to heat-perforate the battery cell 10. During this process, when the diameter of the heating pin 100 is small, it is easy for the heating pin 100 to pass through the central hole 11, thus avoiding puncturing the diaphragm. When the diameter of the heating pin 100 increases, the surface of the heating pin 100 can make full contact with the surface of the diaphragm, thereby achieving a better heating effect.

[0025] In some embodiments, continue to refer to Figure 2 The drive module 200 may include a rotating structure 210, and the heating pin 100 may also include connecting rods 130 corresponding to the plurality of heating parts 120. The rotating structure 210 may be disposed at the end of the connecting shaft 110 and drivenly connected to the connecting shaft 110. In addition, the rotating structure 210 and the connecting shaft 110 may be coaxially arranged. Based on this, when the rotating structure 210 rotates around its own axis, it can drive the connecting shaft 110 to rotate synchronously.

[0026] The rotating structure 210 is provided with arc-shaped holes 211 corresponding to a plurality of connecting rods 130. The arc-shaped holes 211 can penetrate the rotating structure 210 along its axial direction. The preset projection plane is a plane perpendicular to the axis of the connecting shaft 110. In the orthographic projection of the rotating structure 210 onto the projection plane, the distance between the first end of each arc-shaped hole 211 and the axis of the connecting shaft 110 is less than the distance between the second end of the arc-shaped hole 211 and the axis of the connecting shaft 110. That is, the center of the arc-shaped hole 211 is not the same as the center of the rotating structure 210. Thus, the arc-shaped holes 211 tend to extend radially along the rotating structure 210 relative to its center.

[0027] One end of the connecting rod 130 can be fixedly connected to the heating element 120, and the other end of the connecting rod 130 can be connected to the arc-shaped hole 211. The connecting rod 130 can slide relative to the arc-shaped hole 211 along the extension direction of the arc-shaped hole 211. When the connecting rod 130 slides relative to the arc-shaped hole 211, the connecting rod 130 can move radially relative to the rotating structure 210, thereby changing the distance between the end of the connecting rod 130 and the axis of the rotating structure 210. Since the connecting rod 130 is relatively fixed to the heating element 120, the distance between the heating element 120 and the rotating structure 210 (i.e., the connecting shaft 110) changes during the sliding process of the connecting rod 130 relative to the arc-shaped hole 211, thereby changing the diameter of the cylindrical structure formed by the multiple heating elements 120, that is, changing the diameter of the heating needle 100.

[0028] Specifically, when the end of the connecting rod 130 is close to the first end of the arc-shaped hole 211, the diameter of the heating pin 100 is smaller because the distance between the first end of the arc-shaped hole 211 and the axis of the rotating structure 210 is smaller. When the end of the connecting rod 130 is close to the second end of the arc-shaped hole 211, the diameter of the heating pin 100 is larger because the distance between the second end of the arc-shaped hole 211 and the axis of the rotating structure 210 is larger. Therefore, when it is necessary to reduce the diameter of the heating pin 100, the connecting rod 130 can slide relative to the arc-shaped hole 211 in the direction from the second end of the arc-shaped hole 211 to the first end; when it is necessary to increase the diameter of the heating pin 100, the connecting rod 130 can slide relative to the arc-shaped hole 211 in the direction from the first end of the arc-shaped hole 211 to the second end.

[0029] In this embodiment, it is worth noting that when the rotating structure 210 rotates around its own axis, the arc-shaped hole 211 also rotates accordingly. During this process, since the connecting rod 130 is not driven by any other external force, the arc-shaped hole 211 can serve as a power source for the connecting rod 130 when it rotates, thereby driving the rotating structure 210 to slide relative to the arc-shaped hole 211 within the arc-shaped hole 211, thus realizing the radial movement of the connecting rod 130 relative to the connecting shaft 110 along the connecting shaft 110.

[0030] Furthermore, to ensure a stable connection between the connecting rod 130 and the arc-shaped hole 211 and to prevent the connecting rod 130 from falling out of the arc-shaped hole 211, for example, a sliding block for sliding engagement with the arc-shaped hole 211 can be connected to the end of the connecting rod 130. Additionally, a limiting block can be connected to the side of the sliding block away from the connecting rod 130. The width of the arc-shaped hole 211 is smaller than the size of the limiting block, meaning the limiting block cannot be inserted into the arc-shaped hole 211. After the connecting rod 130 and the arc-shaped hole 211 are assembled, the connecting rod 130 and the limiting block are located on opposite sides of the rotating structure 210 along the axial direction. With the cooperation of the connecting rod 130 and the limiting block, the sliding block can be stably connected to the arc-shaped hole 211 at all times.

[0031] like Figure 2 and Figure 4 As shown, in this embodiment, the two ends of the connecting shaft 110 are respectively connected to the rotating structure 210. Correspondingly, the two ends of the hot ironing part 120 along the axial direction of the connecting part are also connected to the rotating structure 210 through the connecting rod 130. Since the hot ironing part 120 has a certain length, when the rotating structure 210 is connected to the two ends of the hot ironing part 120 through the connecting rod 130, it can be ensured that the hot ironing part 120 and the connecting shaft 110 maintain a stable connection when the hot ironing part 120 moves radially relative to the connecting shaft 110.

[0032] Since the rotating structures 210 on both sides are respectively connected to the connecting shaft 110 for transmission, when one rotating structure 210 rotates, it can drive the connecting shaft 110 and the other rotating structure 210 to rotate synchronously. Based on this, as an optional implementation scheme, refer again to Figure 2 The rotating structure 210 may include a first gear, and the drive module 200 may further include a drive device (not shown in the figure) and a second gear 220. The second gear 220 meshes with the first gear, and the drive module 200 can be used to drive the second gear 220 to rotate. In this scheme, the second gear 220 is connected to the first gear in a transmission manner. When the drive module 200 drives the second gear 220 to rotate, the second gear 220 can drive the first gear to rotate, thereby driving the connecting shaft 110 and the first gear on the other side to rotate.

[0033] In practice, the driving device can be, for example, an electric motor.

[0034] In some embodiments, reference is also made to Figure 2 and Figure 5 The heating module 300 may include multiple sets of thermal resistance wires 310 corresponding to the multiple heating parts 120, and each set of thermal resistance wires 310 may be embedded inside the corresponding heating part 120. In addition, each set of thermal resistance wires 310 may also be connected to an external power source through a connecting wire passing through the heating part 120, so that the external power source can supply power to the thermal resistance wires 310, thereby enabling the thermal resistance wires 310 to generate heat and raise the temperature of the heating part 120.

[0035] The resistance wire embedded inside the heating element 120 can extend along the axis of the connecting shaft 110, and the resistance wire 310 can have a serpentine structure, allowing it to extend continuously from one end of the heating element 120 to the other. When the resistance wire 310 is energized and heats up, it transfers heat to the heating element 120, thereby raising its temperature. Because the contact area between the resistance wire 310 and the heating element 120 is large, it not only improves the efficiency of heat transfer but also ensures a uniform temperature across all parts of the heating element 120, thus guaranteeing the effectiveness of the heating needle 100 in creating the heating holes.

[0036] In some embodiments, reference is also made to Figure 1 and Figure 6 The cell separator hot-pressing mechanism in this embodiment may further include a heat preservation device 400, which can keep the hot-pressing needle 100 warm. Since the heating module 300 does not continuously heat the hot-pressing part 120 during heating, it prevents the temperature of the hot-pressing part 120 from becoming too high and affecting the hot-pressing effect. To avoid the hot-pressing needle 100 cooling down before entering the center hole 11 of the cell 10, thus deteriorating the hot-pressing effect, the hot-pressing needle 100 can be placed in the heat preservation device 400 for heat preservation, so that the hot-pressing needle 100 can maintain a stable temperature before entering the center hole 11 of the cell 10.

[0037] like Figure 6 As shown, the heat preservation device 400 has an internal heat preservation cavity 410, which can be cylindrical to accommodate the shape of the heating needle 100. The heat preservation cavity 410 has an inlet and an outlet at its two ends. The heating needle 100 enters the heat preservation cavity 410 through the inlet for heat preservation. When it is necessary to heat a hole in the battery cell 10, the heating needle 100 extends out of the heat preservation cavity 410 through the outlet and then passes through the central hole 11 of the battery cell 10.

[0038] As mentioned earlier, the diameter of the heating pin 100 is relatively small before it enters the central hole 11 of the battery cell 10. To facilitate better heat preservation of the heating pin 100, the diameter of the heat preservation cavity 410 can be approximately the same as the diameter of the heating pin 100 before it enters the central hole 11 of the battery cell 10. In this case, the inlet and outlet of the heat preservation cavity 410 are smaller, which can avoid more heat loss.

[0039] In addition, such as Figure 1As shown, the heat preservation device 400 is positioned close to the battery cell 10, and the axis of the heat preservation cavity 410 can coincide with the axis of the battery cell 10, so that the heating needle 100 can move linearly along the axis and penetrate the central hole 11 of the battery cell 10. In this way, the positioning work between the heating needle 100 and the battery cell 10 after it extends out of the heat preservation cavity 410 can be eliminated, which greatly shortens the time for the heating needle 100 to enter the central hole 11 of the battery cell 10 from the heat preservation cavity 410. This ensures that the temperature of the heating needle 100 is maintained at the heating hole temperature and avoids the heating needle 100 affecting the subsequent heating hole effect due to inaccurate positioning.

[0040] Furthermore, the cell separator hot-drilling mechanism in this embodiment may also include a moving module (not shown in the figure). This moving module can be used to drive the hot-drilling needle 100 from the inlet of the heat-insulating cavity 410 into the heat-insulating cavity 410, and drive the hot-drilling needle 100 out of the heat-insulating cavity 410 and then extend into the center hole 11 of the cell 10. In addition, after hot-drilling one of the cells 10 on the production line, the moving module can also drive the hot-drilling needle 100 from the outlet of the heat-insulating cavity 410 back into the heat-insulating cavity 410. After the next cell 10 moves to the hot-drilling station, the hot-drilling needle 100, which is in the heat-insulating state, extends out of the heat-insulating cavity 410 again to perform the next hot-drilling. In the above process, after the hot-drilling needle 100 completes the hot-drilling, the diameter of the hot-drilling needle 100 decreases, and then it returns to the heat-insulating cavity 410.

[0041] Continue to refer to Figure 6 The insulation device 400 may further include multiple heating modules 420, which are evenly distributed around the circumference of the insulation cavity 410. Each heating module 420 can be used to heat the insulation cavity 410 so that the temperature inside the insulation cavity 410 reaches a preset temperature. The multiple heating modules 420 arranged around the insulation cavity 410 can make the temperature inside the insulation cavity 410 uniform, thereby ensuring the insulation effect of the insulation cavity 410 on the hot iron 100.

[0042] Furthermore, the insulation device 400 may also include a temperature sensor 430, which can be used to detect the temperature inside the insulation cavity 410. When the heating module 420 heats the insulation cavity 410, the temperature sensor 430 can detect the temperature of the insulation cavity 410 in real time until the temperature inside the insulation cavity 410 rises to a preset temperature value. The temperature in the insulation cavity 410 can be approximately the same as the preset hot-hole temperature of the hot-scalding needle 100, so that the hot-scalding needle 100 can maintain the preset temperature of the hot-hole in the insulation cavity 410, thereby ensuring the hot-scalding effect.

[0043] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A cell separator hot-drilling mechanism, characterized in that, This includes heat exchange needles, drive modules, and heating modules; The hot iron includes a connecting shaft and a plurality of hot ironing parts connected to the connecting shaft. The plurality of hot ironing parts are evenly distributed around the circumference of the connecting shaft, and the plurality of hot ironing parts are arranged to form a cylindrical structure coaxial with the connecting shaft. The drive module is connected to each of the hot ironing parts. The drive module is used to drive each of the hot ironing parts to move synchronously along the connecting shaft relative to the connecting shaft, so as to change the diameter of the cylindrical structure formed by the plurality of hot ironing parts. The heating module is used to heat each of the hot-scalding parts to change the temperature of the hot-scalding parts.

2. The cell separator hot-hole mechanism according to claim 1, characterized in that, The heating module includes multiple sets of thermal resistance wires that correspond one-to-one with the multiple heat-heating parts, and each set of thermal resistance wires is embedded in the corresponding heat-heating part.

3. The cell separator hot-hole mechanism according to claim 2, characterized in that, The thermal resistance wire extends along the axial direction of the connecting shaft, and the thermal resistance wire has a serpentine structure.

4. The cell separator hot-hole mechanism according to claim 1, characterized in that, The heating needle also includes a connecting rod that corresponds one-to-one with the plurality of heating parts, and the drive module includes a rotating structure; The rotating structure is connected to the end of the connecting shaft in a transmission manner. The rotating structure and the connecting shaft are coaxially arranged, and the rotating structure can rotate around its own axis. The rotating structure is provided with arc-shaped holes that correspond one-to-one with the plurality of hot-heating parts. The distance between the first end of the arc-shaped hole and the axis of the connecting shaft is smaller than the distance between the second end of the arc-shaped hole and the axis of the connecting shaft. One end of the connecting rod is connected to the hot-pressing part, and the other end of the connecting rod is slidably connected to the arc-shaped hole along the extension direction of the arc-shaped hole.

5. The cell separator hot-hole mechanism according to claim 4, characterized in that, The rotating structure includes a first gear; The drive module further includes a drive device and a second gear, the second gear meshing with the first gear, and the drive device driving the second gear to rotate.

6. The cell separator hot-hole mechanism according to claim 4, characterized in that, The rotating structure is connected to both ends of the connecting shaft, and the two ends of the hot ironing part along the axial direction of the connecting shaft are connected to the arc-shaped holes of the rotating structure through the connecting rod.

7. The cell separator hot-hole mechanism according to claim 1, characterized in that, It also includes a heat preservation device, which has an internal heat preservation cavity for accommodating the hot needle.

8. The cell separator hot-hole mechanism according to claim 7, characterized in that, The insulation device also includes a plurality of heating modules evenly distributed around the circumference of the insulation cavity, the heating modules being used to heat the insulation cavity.

9. The cell separator hot-hole mechanism according to claim 8, characterized in that, The insulation device also includes a temperature sensor, which is used to detect the temperature of the insulation cavity.

10. The cell separator hot-hole mechanism according to claim 7, characterized in that, It also includes a moving module, which is used to drive the heating needle into or out of the heat preservation cavity, and the moving module is also used to drive the heating needle to extend into the center hole of the battery cell.

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