Flattening mechanism and flattening device

Abstract

The application provides a flattening mechanism and a flattening device. The flattening device comprises the flattening mechanism. The flattening mechanism is used for flattening the core end face of a core, and comprises a base and a flattening blocking component. The middle part of the base is provided with a center needle, the base can rotate around the axis of the center needle and is used for mounting the core. The flattening blocking component is arranged on the base and comprises a flattening part and a blocking part. The flattening part is rotatably in contact with the center needle and is used for flattening the core end face. The blocking part is arranged on the side of the flattening part. When the flattening part is in contact with the core end face, the blocking part blocks the outer edge of the core end face, so as to prevent the tab of the core end face from turning outward during the flattening process. The flattening mechanism and the flattening device can at least improve the technical problem of tab turning outward.

Description

Technical Field

[0001] This application relates to the field of core processing technology, specifically to a flattening mechanism and flattening device. Background Technology

[0002] In related technologies, the flattening process of cylindrical batteries with full tabs all adopts an integrated large-area flattening mechanism. This results in low flatness of the end face of the core processed by the integrated large-area flattening mechanism, and process problems such as tabs turning outward and core center protrusion may occur, resulting in low production yield and being unfavorable for mass production of batteries. Utility Model Content

[0003] The embodiments of this application provide a flattening mechanism and a flattening device, which can at least improve the technical problem of electrode tab eversion.

[0004] In a first aspect, embodiments of this application provide a flattening mechanism for flattening the end face of a winding core, comprising: A base having a central pin in the middle, the base being rotatable about the axis of the central pin and used for mounting the winding core; A flattening blocking component is disposed on the base. The flattening blocking component includes a flattening part and a blocking part. The flattening part is rotatably in contact with the center needle. The flattening part is used to flatten the end face of the core. The blocking part is disposed on the side of the flattening part. When the flattening part contacts the end face of the core, the blocking part blocks the outer edge of the end face of the core to prevent the tabs on the end face of the core from turning outward during the flattening process. This design prevents the tabs from turning outward when the flattening mechanism flattens the end face of the core.

[0005] In some embodiments, the flattening portion includes a contact surface for contacting and flattening the end face of the core, and the blocking portion includes a blocking protrusion that protrudes from the contact surface. The blocking protrusion protruding from the contact surface prevents the tabs from turning outwards when the flattening mechanism flattens the end face of the core.

[0006] In some embodiments, the kneading blocking component further includes a support portion connected to the base, a first end of the blocking protrusion connected to the support portion, and the kneading portion connected to a second end of the blocking protrusion opposite to the first end. This configuration improves the structural stability of the kneading portion and the blocking portion.

[0007] In some embodiments, the support portion further includes: A support base, which is detachably connected to the base; A connecting block, the connecting block being connected to the support base; A support block, which is connected to the blocking protrusion; A rotating shaft connects the bearing block and the connecting block. This design improves the structural stability of the kneading blocking component and prevents the center of gravity of the kneading blocking component from being located on the kneading part, which could cause the kneading part to wobble during rotation.

[0008] In some embodiments, the blocking protrusion has a first clearance surface on the side near the center pin, and the first clearance surface is inclined in a direction away from the center pin. This arrangement, to a certain extent, avoids the problem of the blocking protrusion rubbing against the core, which could lead to damage to the core.

[0009] In some embodiments, the flattening section includes a flattening cone, the cone angle A of which satisfies the relationship: 45°≤A≤75°. This configuration allows the flattened core end face to be smoother and prevents the flattening cone from damaging the tabs.

[0010] In some embodiments, the central needle has a positioning hole, and the end of the kneading cone passes through the positioning hole. This arrangement effectively reduces the shaking of the kneading part and improves the kneading effect of the kneading mechanism.

[0011] In some embodiments, the kneading blocking component includes multiple different models, each with a different size, and all models are detachable and can be selectively connected to the base. This configuration improves the adaptability of the kneading mechanism, allowing the selection of the appropriate kneading blocking component for installation based on different types of core rolls.

[0012] In some embodiments, the kneading mechanism further includes a driving component connected to the base and driving the base to rotate in a first rotation direction; The first rotation direction is opposite to the winding direction of the core. This arrangement allows the flattened end face of the core to be smoother to some extent.

[0013] In some embodiments, the base includes a disc base, and the center pin is disposed at the center of the disc base; The kneading blocking components include multiple components, which are arranged at equal intervals around the central needle on the disc base. This arrangement improves the working efficiency of the kneading mechanism.

[0014] Secondly, embodiments of this application provide a kneading device, which includes the aforementioned kneading mechanism.

[0015] Compared with related technologies, this application has a blocking part, so when the tab turns outward during the flattening process, the blocking part can block the tab of the turned-out part, thereby preventing the tab of the turned-out part from protruding from the outer edge of the core end face. At the same time, the blocked tab of the turned-out part will be flattened again by the flattening part, thereby making the core end face flat. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the kneading device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the kneading mechanism provided in an embodiment of this application; Figure 3 This is a schematic diagram of the kneading blocking component provided in an embodiment of this application; Figure 4 This is a partial structural schematic diagram of the kneading component provided in an embodiment of this application; Figure 5 This is a partial structural cross-sectional view of the kneading mechanism provided in an embodiment of this application; Figure 6 This is a three-dimensional schematic diagram of the center pin provided in an embodiment of this application.

[0018] The above figures include the following reference numerals: 1. Flattening device; 2. Flattening mechanism; 3. Core; 20. Base; 21. Center pin; 22. Flattening blocking component; 30. Center through hole; 31. Core end face; 201. Disc seat; 211. Positioning hole; 221. Flattening part; 222. Blocking part; 223. Support part; 2211. Flattening cone; 2212. Contact surface; 2221. Blocking protrusion; 2222. First clearance surface; 2231. Support seat; 2232. Connecting block; 2233. Bearing block; 2234. Rotating shaft. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0020] In related technologies, cylindrical batteries with all tabs often have tabs protruding from the end face. During processing, these tabs typically need to be flattened to prevent them from protruding. The flattening process involves applying pressure to the end face using a flattening device, ultimately pressing the tabs onto the end face. However, using this flattening device can lead to uneven end faces or the tabs turning outwards during the flattening process. Notably, when the tabs turn outwards, this can cause them to come into contact with the outer casing of the battery core, which is usually conductive. This could ultimately lead to a short circuit and damage to the battery.

[0021] To address the problems existing in the relevant technologies, please refer to the appendix. Figures 1 to 3 As shown, this application provides a flattening device 1, which includes a flattening mechanism 2. The flattening mechanism 2 is used to flatten the core end face 31 of the core 3, and includes a base 20 and a flattening blocking member 22.

[0022] Specifically, the base 20 has a center pin 21 in its center, and the base 20 can rotate around the axis of the center pin 21 and is used to mount the core 3. A flattening blocking member 22 is disposed on the base 20. The flattening blocking member 22 includes a flattening part 221 and a blocking part 222. The flattening part 221 is rotatably in contact with the center pin 21 and is used to flatten the end face 31 of the core. The blocking part 222 is disposed on the side of the flattening part 221. When the flattening part 221 contacts the end face 31 of the core, the blocking part 222 blocks the outer edge of the end face 31 of the core to prevent the tabs of the end face 31 of the core from turning outwards during the flattening process. Furthermore, as... Figure 1 As shown, in some embodiments, the kneading device 1 includes at least two bases 20, and a central needle 21 is connected between the two bases 20.

[0023] In this embodiment, the core 3 has a central through hole 30 for the central needle 21 to pass through, so as to fix the core 3 to the flattening mechanism 2. When the flattening mechanism 2 is working, the operator first fixes the core 3 to the flattening mechanism 2 through the central needle 21. Since the flattening part 221 is in contact with the central needle 21, the flattening part 221 is also in contact with the core end face 31 of the core 3. Then, the base 20 and the flattening part 221 are rotated. The flattening part 221 rotates around the central needle 21 under the drive of the base 20, and at the same time, the flattening part 221 also rotates on its own axis, thereby flattening the end face of the core 3. In addition, since the blocking part 222 blocks the outer edge of the core end face 31, when the tabs turn outward, the blocking part 222 applies a stopping effect to the tabs of the outward part, thereby avoiding the problem of the tabs turning outward to a certain extent. Compared with related technologies, this application has a blocking part 222. When the tab turns outward during the flattening process, the blocking part 222 can block the tab of the outward turning part, thereby preventing the tab of the outward turning part from protruding out of the outer edge of the core end face 31. At the same time, the blocked tab of the outward turning part will be flattened again by the flattening part 221, thereby making the core end face 31 flat.

[0024] In some embodiments, the blocking portion 222 may rotate synchronously with the kneading portion 221, while in other embodiments, the blocking portion 222 may be stationary relative to the kneading portion 221.

[0025] In some embodiments, the flattening portion 221 includes a contact surface 2212 for contacting and flattening the core end face 31, and the blocking portion 222 includes a blocking protrusion 2221 that protrudes from the contact surface 2212.

[0026] Specifically, when the flattening portion 221 contacts the core end face 31, the contact surface 2212 adheres to the core end face 31, and the blocking protrusion 2221 protrudes from the contact surface 2212, so that the blocking protrusion 2221 is located at the outer edge of the core end face 31. During the flattening process, if the tabs of the core end face 31 turn outward, the outward-turned tabs can be blocked by the blocking protrusion 2221, so that the outward-turned tabs are still located inside the core end face 31. When the contact surface 2212 of the flattening portion 221 contacts this part of the tab, the contact surface 2212 will flatten the tabs again. In some embodiments, when the flattening portion 221 contacts the end face of the core 3, the blocking protrusion 2221 abuts against the outer edge of the core end face 31. This arrangement can improve the blocking effect of the blocking protrusion 2221. In other embodiments, when the flattening portion 221 contacts the end face of the core 3, the blocking protrusion 2221 and the outer edge of the core end face 31 have a first gap. This first gap provides a certain amount of space for the core 3 to move, preventing the core 3 from shaking during the flattening process, which would cause the blocking protrusion 2221 to wear the core 3.

[0027] In some embodiments, the flattening blocking member 22 further includes a support portion 223, which is connected to the base 20. The first end of the blocking protrusion 2221 is connected to the support portion 223, and the flattening portion 221 is connected to the second end of the blocking protrusion 2221 opposite to the first end. Specifically, the support portion 223 connects the flattening blocking member 22 to the base 20, thereby forming a stable support system, improving the strength and stability of the flattening mechanism 2, and reducing the vibration of the flattening mechanism 2. In addition, in this embodiment, the blocking protrusion 2221 is disposed between the flattening portion 221 and the support portion 223. When the flattening portion 221 flattens the core end face 31, the blocking protrusion 2221 will not interfere with the flattening portion 221. Moreover, this arrangement results in a simple structure that is easy to manufacture.

[0028] In some embodiments, the support portion 223 further includes a support base 2231, a connecting block 2232, a bearing block 2233, and a rotating shaft 2234. The support base 2231 is detachably connected to the base 20, the connecting block 2232 is connected to the support base 2231, the bearing block 2233 is connected to the blocking protrusion 2221, and the rotating shaft 2234 connects the bearing block 2233 and the connecting block 2232.

[0029] Specifically, when the flattening blocking component 22 needs to be replaced, it can be removed from the base 20 by disassembling the support base 2231. Furthermore, the support 223 also includes a rotating shaft 2234 and a connecting block 2232. The rotating shaft 2234 is rotatably mounted on the connecting block 2232 so that the rotating shaft 2234, the bearing block 2233, the blocking protrusion 2221, and the flattening cone 2211 can rotate synchronously. In some embodiments, a bearing is provided inside the connecting block 2232, and the rotating shaft 2234 passes through the bearing. In this embodiment, the bearing block 2233 is used to adjust the center of gravity of the flattening blocking component 22, ensuring that the center of gravity of the flattening blocking component 22 is on the bearing block 2233, thus preventing excessive vibration of the flattening part 221 during rotation and avoiding poor flattening effect on the core end face 31.

[0030] See Figure 4 and Figure 5As shown, in some embodiments, a first clearance surface 2222 is provided on the side of the blocking protrusion 2221 near the center pin 21, and the first clearance surface 2222 is inclined in a direction away from the center pin 21. Specifically, when the flattening mechanism 2 contacts the core end face 31 of the core 3, that is, when the contact surface 2212 of the flattening cone 2211 acts on the core end face 31, the first clearance surface 2222 of the blocking protrusion 2221 is located on the outer periphery of the core end face 31, and there is a certain angle between the first clearance surface 2222 and the outer wall surface of the core 3. This design can prevent the core 3 from shaking during flattening, which would cause the blocking protrusion 2221 to directly contact the core 3 and cause the core 3 to be worn.

[0031] In some embodiments, the flattening portion 221 includes a flattening cone 2211, the cone angle A of which satisfies the relationship: 45°≤A≤75°. Specifically, if A is greater than 75°, the contact point between the flattening cone 2211 and the core end face 31 may be concave after the core end face 31 is flattened, resulting in an uneven core end face 31. If A is less than 45°, the tip of the flattening cone 2211 is relatively sharp, and if it contacts the tab, it may easily cause damage to the tab due to the external force applied by the tip of the flattening cone 2211 during the flattening process. Therefore, when the value of A satisfies the relationship: 45°≤A≤75°, the flattening cone 2211 will neither cause the core end face 31 to be concave nor cause damage to the tab during the flattening process. In this embodiment, the value of A can be 45°, 50°, 55°, 60°, 65°, 70° and 75°. In a preferred embodiment, the value of A is 55°.

[0032] In fact, when the base 20 rotates, it causes the flattening cone 2211 to rotate around the center needle 21. Although the flattening cone 2211 contacts the center needle 21, it may still wobble under external force. This may result in unevenness of the core end face 31 after the flattening cone 2211 flattens it. On the other hand, the wobble of the flattening cone 2211 may cause some of the tabs near the center through hole 30 to bulge in a direction away from the core end face 31. To solve these problems, in some embodiments, as shown in the attached... Figure 6 As shown, a positioning hole 211 is provided on the center needle 21, and the end of the flattening cone 2211 passes through the positioning hole 211. Specifically, after the end of the flattening cone 2211 passes through the positioning hole 211, the positioning hole 211 can exert a certain limiting effect on the flattening cone 2211, preventing the flattening cone 2211 from shaking to a certain extent. Therefore, the end face 31 of the core can be flattened to be relatively flat, and no tabs protruding from the end face 31 of the core will be generated near the center through hole 30.

[0033] Since the core 3 may come in various sizes, meaning its thickness may differ, the dimensions of the core end face 31 will also vary. Therefore, when the dimensions of the core end face 31 cannot match the length of the flattening cone 2211, the flattening mechanism 2 cannot flatten the core end face 31. Thus, in some embodiments, the flattening blocking component 22 includes various models with different dimensions, and these models are detachable and selectively connected to the base 20.

[0034] Specifically, the different sizes of the flattening blocking component 22 refer to the different lengths of the flattening cone 2211 of the flattening blocking component 22 for different signals. When flattening cores 3 of different sizes, different models of flattening blocking components 22 can be selected for adaptation according to the size of the core 3.

[0035] In some embodiments, the kneading mechanism 2 further includes a driving component connected to the base 20 and driving the base 20 along a first rotation direction (as shown in the attached figure). Figure 1 Rotate in the X1 direction. The first rotation direction is opposite to the winding direction of the core 3 (as shown in the attached diagram). Figure 1 (Opposite to the X2 direction)

[0036] Specifically, in this embodiment, the driving component includes a motor connected to the base 20, which drives the base 20 to rotate in the first rotation direction, thereby causing the flattening blocking component 22 on the base 20 to rotate around the center needle 21. It is worth noting that during the winding process, the inner film of the core 3 is under tension. If the first rotation direction is the same as the winding direction of the core 3, when the flattening cone 2211 acts on the end face 31 of the core, the inner film of the core 3 will be further tightened. This may lead to excessive stress inside the core 3, potentially causing the core 3 to exert external force on the flattened tabs, resulting in the tabs lifting. However, when the first rotation direction is opposite to the winding direction of the core 3, after the flattening cone 2211 acts on the end face 31 of the core, the flattening cone 2211 will loosen the inner film of the core 3, reducing the stress on the inner film and preventing the core 3 from exerting excessive external force on the flattened tabs.

[0037] In some embodiments, the base 20 includes a disc base 201, and a center needle 21 is disposed at the center of the disc base 201. Multiple kneading blocking members 22 are provided, and these multiple kneading blocking members 22 are disposed at equal intervals around the center needle 21 on the disc base 201.

[0038] Specifically, the arrangement of multiple flattening blocking components 22 can improve the flattening efficiency of the flattening mechanism 2 on the core end face 31. In one specific embodiment, the flattening blocking components 22 include three components, which are arranged in an equilateral triangle on the disc base 201 with the center pin 21 as the midpoint. Of course, the flattening blocking components 22 can also be two, four, five, etc., and any other variations within the concept of this application are within the protection scope of this application.

[0039] In addition, this application provides specific embodiments to verify the effect: Example 1: When the flattening device of this application was used to process 637 cores, the number of cores with outwardly turned tabs was 0.

[0040] Example 2: Unlike Example 1, the number of cores is 1286, and the number of cores with tabs turned outward is still 0.

[0041] Comparative Example 1: Unlike Example 1, the flattening blocking component 22 does not have a blocking part 222, the number of processed cores is 478, and the number of cores with outwardly turned tabs is 263.

[0042] Comparative Example 2: Unlike Example 1, the flattening blocking component 22 does not have a blocking part 222, the number of processed cores is 1583, and the number of cores with outwardly turned tabs is 628.

[0043] Based on Examples 1, 2, Comparative Example 1, and Comparative Example 2, it can be clearly seen that the flattening device of this application can significantly improve the yield of the processed core.

[0044] In summary, this application has at least the following beneficial effects: (1) The flattening blocking component 22 of the flattening mechanism 2 of this application includes a flattening part 221 and a blocking part 222. The flattening part 221 is used to flatten the end face 31 of the core, and the blocking part 222 is used to prevent the tabs of the end face 31 of the core from turning outward during the flattening process. This arrangement can prevent the tabs of the end face 31 of the core from turning outward, causing the tabs to directly contact the outer shell of the core 3, which may lead to damage to the battery.

[0045] (2) By setting up the support base 2231, connecting block 2232, bearing block 2233, rotating shaft 2234, blocking protrusion 2221 and kneading part 221, the structural stability of the kneading blocking component 22 can be improved. On the one hand, it avoids the problem that the center of gravity of the kneading blocking component 22 is close to the kneading part 221, which may cause the kneading part 221 to shake after rotation. On the other hand, the design of the connecting block 2232 and the support base 2231 can also reduce the vibration of the kneading part 221 to a certain extent.

[0046] (3) By setting a first clearance surface 2222 on the blocking protrusion 2221, the problem of the blocking protrusion 2221 directly contacting and abrading the core 3 can be avoided by the core 3 shaking during the flattening process of the flattening mechanism 2.

[0047] (4) The flattening part 221 includes a flattening cone 2211, and the cone angle A of the flattening cone 2211 satisfies the relationship: 45°≤A≤75°. This setting avoids the problem of the flattening cone 2211 causing a concave area on the end face 31 of the core after it acts on the core end face 31. On the other hand, it also avoids the problem of the flattening cone 2211 causing damage to the tabs to a certain extent.

[0048] (5) A positioning hole 211 is provided on the center needle 21. The positioning hole 211 can reduce the shaking of the flattening cone 2211 to a certain extent, so that the core end face 31 processed by the flattening mechanism 2 is flatter.

[0049] (6) By setting a drive component, the drive component drives the base 20 to rotate in the first rotation direction, and the first rotation direction is opposite to the winding direction of the core 3. This setting reduces the force exerted by the core 3 on the flattened tab, thereby preventing the flattened tab from lifting under the action of the core 3 to a certain extent.

[0050] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A flattening mechanism, said flattening mechanism being used to flatten the core end face (31) of a core (3), characterized in that, include: The base (20) has a center pin (21) in the middle, and the base (20) can rotate about the axis of the center pin (21) and is used to install the core (3). A flattening blocking component (22) is disposed on the base (20). The flattening blocking component (22) includes a flattening part (221) and a blocking part (222). The flattening part (221) is rotatably in contact with the center needle (21). The flattening part (221) is used to flatten the end face (31) of the core. The blocking part (222) is disposed on the side of the flattening part (221). When the flattening part (221) contacts the core end face (31), the blocking part (222) blocks the outer edge of the core end face (31) to prevent the tabs of the core end face (31) from turning outward during the flattening process.

2. The kneading mechanism according to claim 1, characterized in that, The flattening part (221) includes a contact surface (2212) for contacting the end face (31) of the core and flattening the end face (31), and the blocking part (222) includes a blocking protrusion (2221) that protrudes from the contact surface (2212).

3. The kneading mechanism according to claim 2, characterized in that, The kneading blocking component (22) also includes a support (223), which is connected to the base (20). The first end of the blocking protrusion (2221) is connected to the support (223), and the kneading part (221) is connected to the second end of the blocking protrusion (2221) opposite to the first end.

4. The kneading mechanism according to claim 3, characterized in that, The support portion (223) further includes: Support base (2231), which is detachably connected to the base (20); Connecting block (2232), the connecting block (2232) is connected to the support base (2231); The support block (2233) is connected to the blocking protrusion (2221); A rotating shaft (2234) is connected between the bearing block (2233) and the connecting block (2232).

5. The kneading mechanism according to claim 2, characterized in that, The blocking protrusion (2221) has a first clearance surface (2222) on the side near the center pin (21), and the first clearance surface (2222) is inclined in a direction away from the center pin (21).

6. The kneading mechanism according to claim 2, characterized in that, The flattening section (221) includes a flattening cone (2211), and the cone angle A of the flattening cone (2211) satisfies the relationship: 45°≤A≤75°.

7. The kneading mechanism according to claim 6, characterized in that, The center needle (21) has a positioning hole (211), and the end of the flattening cone (2211) passes through the positioning hole (211).

8. The kneading mechanism according to any one of claims 1 to 7, characterized in that, The kneading blocking component (22) includes various models, and the kneading blocking component (22) of various models has different sizes. The kneading blocking component (22) of various models is detachable and can be selectively connected to the base (20).

9. The kneading mechanism according to any one of claims 1 to 7, characterized in that, The kneading mechanism further includes a driving component, which is connected to the base (20) and drives the base (20) to rotate in a first rotation direction; The first rotation direction is opposite to the winding direction of the core (3).

10. The kneading mechanism according to any one of claims 1 to 7, characterized in that, The base (20) includes a disc base (201), and the center pin (21) is disposed at the center of the disc base (201); The kneading blocking component (22) includes a plurality of components, which are arranged at equal intervals around the central needle (21) on the disc base (201).

11. A kneading and leveling device, characterized in that, The kneading device includes the kneading mechanism according to any one of claims 1 to 10.

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