Battery tab shaping equipment

Abstract

The utility model relates to the technical field of pole lug shaping, in particular to battery pole lug shaping equipment which comprises a carrying table and a pole lug pre-folding device, the carrying table comprises a conveying surface, the conveying surface is used for supporting a pole piece and conveying the pole piece to move, a pole lug on the edge of the pole piece is located on the outer side of the conveying surface, and the pole lug pre-folding device is located on the side, where the pole lug is located, of the conveying surface; the tab pre-folding device comprises an upper pressing wheel and a lower pressing wheel, the bottom end of the upper pressing wheel, the top end of the lower pressing wheel and the pole piece are arranged in a non-coplanar mode, the bottom end of the upper pressing wheel is used for being pressed on the top face of the tab, and the top end of the lower pressing wheel is used for being pressed on the bottom face of the tab; the upper pressing wheel and the lower pressing wheel synchronously rotate along with the conveying of the pole lug, so that the pole lug is bent by a set angle relative to the pole piece, and the bent pole piece forms a crease at the root part of the pole lug. According to the technical scheme, folding marks are formed at the roots of the tabs, folding operation on the tabs is facilitated, the probability of deviation of the tabs during folding is low, and folding and shaping steps are matched to complete folding and cutting type shaping.

Description

Technical Field

[0001] The utility model relates to the technical field of tab shaping, in particular to a battery tab shaping device. Background Art

[0002] The battery cell of a cylindrical battery is formed by winding the pole piece, wherein the side end of the pole piece includes a pole ear. After the pole piece is wound, a pole ear structure is formed at the end of the winding core. At this time, the pole ear structure needs to be shaped. The existing processing method is: the pole ear is gathered by a conical roller, and then the pole ear is flattened, and the flat block is used to flatten the gathered pole ear surface, so as to achieve the effect of pole ear shaping.

[0003] Among them, the folding is a pre-folding operation of the pole ear. This method uses a conical roller operation, which is very easy to cause the pole ear pre-folding misalignment, that is, the folding status of multiple pole ears is inconsistent, and the deviation is large, which affects the subsequent shaping operation. Utility Model Content

[0004] In order to solve at least the above technical problems existing in the prior art, an embodiment of the utility model provides a battery tab shaping device.

[0005] On the one hand, an embodiment of the utility model provides a battery tab shaping device, including a carrier and a tab pre-folding device; the carrier includes a conveying surface, the conveying surface is used to support the pole piece and to convey the pole piece to move, the pole piece at the edge of the pole piece is located on the outside of the conveying surface, and the tab pre-folding device is located on the side of the conveying surface where the pole piece is located; the tab pre-folding device includes an upper pressing wheel and a lower pressing wheel, the bottom end of the upper pressing wheel and the top end of the lower pressing wheel are arranged non-coplanar with the pole piece, and the bottom end of the upper pressing wheel is used to press on the top surface of the pole piece, and the top end of the lower pressing wheel is used to press on the bottom surface of the pole piece; the upper pressing wheel and the lower pressing wheel rotate synchronously with the conveyance of the pole piece, so that the pole piece is bent at a set angle relative to the pole piece, and the bent pole piece forms a crease at the root of the pole piece.

[0006] In some embodiments, the bottom end of the upper pressing wheel and the top end of the lower pressing wheel are both lower than the height of the pole piece, and the upper pressing wheel and the lower pressing wheel are staggered in height direction.

[0007] In some embodiments, the tab pre-folding device further includes a bending holding structure, and the bending holding structure is used to keep the tab at a set bending angle.

[0008] In some embodiments, the bending retaining structure includes a guide block, which is located on one side of the bottom surface of the pole ear; the guide block includes an inclined guide surface, the inclination angle of the guide surface is the same as the bending angle of the pole ear, and the guide surface is also provided with an adsorption hole, which is used to adsorb the pole ear so that the pole ear maintains the set bending angle.

[0009] In some embodiments, a folding structure is also included, which includes a first winding core fixing position and a pushing block; the first winding core fixing position is used to fix the winding core structure after the pole piece is wound; the pushing block is located on one side of the first winding core fixing position, and the pushing block is used to push the pole ears of the winding core structure to gather toward the center of the winding core structure.

[0010] In some embodiments, the folding structure also includes a first telescopic member, which is connected to the push block and is used to push the push block to reciprocate linearly; the push block is located on the outer side of the circumference of the winding core structure, and the push block moves radially along the winding core structure to push the pole ear to gather toward the center of the winding core structure.

[0011] In some embodiments, the push block includes a push surface; the height of the push surface gradually increases from the starting end to the end end, so that the pushing force applied by the push surface to the pole ear gradually increases.

[0012] In some embodiments, an end face shaping structure is also included, which includes a second core fixing position and a shaping block; the second core fixing position is used to fix the core structure; the shaping block is located on the outside of the end face of the core structure, and the shaping block is used to press the pole ear to adjust the flatness of the pole ear.

[0013] In some embodiments, the end face shaping structure also includes a distance measuring device and a second telescopic member, wherein the distance measuring device is used to measure the distance information between the shaping block and the surface of the pole ear; the second telescopic member is connected to the shaping block and is used to drive the shaping block to move a set distance toward the pole ear according to the distance information.

[0014] In some embodiments, the end face shaping structure further includes a heating device, and the heating device is used to adjust the temperature of the shaping block so that the shaping block can perform hot pressing on the tab.

[0015] A battery tab shaping device provided by the present utility model performs a pre-folding operation on the tabs through a tab pre-folding device before the folding operation. The pre-folding operation can form a crease at the root of the tabs. Then, a tab structure with higher flatness can be obtained through the folding and end face shaping operations. The technical solution of the present utility model forms a crease at the root of the tabs, which is beneficial to the folding operation of the tabs. The probability of deviation of the tabs during folding is low. Coupled with the folding and shaping steps, the stacked cutting type shaping is completed. This tab shaping method generates fewer metal chips compared to the ironing type shaping, which facilitates the immersion of the electrolyte; and the tabs have high flatness, which is beneficial to the laser welding of the bus bar and the tabs, and the current output uniformity is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, wherein:

[0017] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0018] Figure 1 is a schematic structural diagram of a carrier and a tab pre-folding device in the battery tab shaping device provided by an embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of a core structure formed after the tabs are pre-folded in the battery tab shaping device provided by an embodiment of the present utility model;

[0020] Figure 3 is a schematic structural diagram of a folding structure in the battery tab shaping device provided by an embodiment of the present utility model;

[0021] Figure 4 is a partial enlarged view when the folding structure in the battery tab shaping device provided by an embodiment of the present utility model is in use;

[0022] Figure 5 is a schematic structural diagram of an end face shaping structure in the battery tab shaping device provided by an embodiment of the present utility model.

[0023] In the figure:

[0024] 1. Carrier; 2. Tab pre-folding device; 3. Core structure; 4. Folding structure; 5. End face shaping structure;

[0025] 11. Conveyor surface;

[0026] 21. Upper pressing wheel; 22. Lower pressing wheel; 23. Bending holding structure; 231. Guide block; 232: Guide surface;

[0027] 31: Tab

[0028] 41: first winding core fixing position; 42: push block; 43: first telescopic member; 44: push surface;

[0029] 51: second winding core fixing position; 52: shaping pressing block; 53: second telescopic member. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] The embodiment of the utility model provides a battery tab shaping device, including a carrier, a tab pre-folding device, a folding structure and an end face shaping structure; the carrier is used to convey the pole piece, and cooperates with the tab pre-folding device to enable the tab to be bent at a set angle; the folding structure is used to fold the tab of a wound core structure, and finally, the tab is shaped by the end face shaping structure to finally form a flat tab structure.

[0032] In conjunction with the accompanying drawings, the various structures in the battery tab shaping device provided by the embodiment of the utility model, as well as the positional relationship and connection relationship of the various structures are described in detail below.

[0033] like Figure 1 As shown, the carrier 1 includes a conveying surface 11, which is used to support the electrode sheet and to convey the electrode sheet for movement. The electrode ear 31 at the edge of the electrode sheet is located on the outside of the conveying surface 11, and the electrode ear pre-folding device 2 is located on the side of the conveying surface 11 where the electrode ear 31 is located; for example, the conveying surface 11 includes a conveying roller, which drives the electrode sheet to move horizontally, and a electrode ear pre-folding device 2 is arranged on one side of the conveying surface 11. As the electrode sheet moves, the electrode ear 31 moves synchronously, and the moving electrode ear 31 is pre-folded at a certain angle by the electrode ear pre-folding device 2, and a crease is formed at the root of the electrode ear 31, that is, the connection position of the electrode ear 31 and the electrode sheet, and the crease is conducive to making the electrode ear 31 produce a more regular bend in the subsequent operation steps.

[0034] For example, the tab pre-folding device 2 includes an upper pressing wheel 21 and a lower pressing wheel 22. The bottom end of the upper pressing wheel 21 and the top end of the lower pressing wheel 22 are arranged non-coplanarly with the tab, that is, the bottom end of the upper pressing wheel 21 and the top end of the lower pressing wheel 22 are arranged offset. For example, the heights of the bottom end of the upper pressing wheel 21 and the top end of the lower pressing wheel 22 are both lower than the height of the tab, and the upper pressing wheel 21 and the lower pressing wheel 22 are arranged offset in the height direction. Horizontally, the upper pressing wheel 21 is located on the outside, and the lower pressing wheel 22 is located between the upper pressing wheel 21 and the tab.

[0035] As shown in the figure, the height of the bottom end of the upper pressing wheel 21 is lower than the height of the top end of the upper pressing wheel 21, and the height of the top end of the upper pressing wheel 21 is lower than the height of the tab. An inclined pressing space is formed between the bottom end of the upper pressing wheel 21 and the top end of the lower pressing wheel 22. The bottom end of the upper pressing wheel 21 is used to press against the top surface of the tab 31, and the top end of the lower pressing wheel 22 is used to press against the bottom surface of the tab 31; thus, the tab 31 can be pressed to a set angle.

[0036] It can be seen therefrom that the inclination angle of the tab 31 can be adjusted by the relative positions of the upper pressing wheel 21 and the lower pressing wheel 22.

[0037] In the embodiment of the present utility model, during the pre-folding operation, the upper pressing wheel 21 and the lower pressing wheel 22 rotate synchronously with the conveyance of the tab 31, so that the tab 31 is bent by a set angle relative to the tab, and a crease is formed at the root of the tab 31 on the bent tab.

[0038] After pre-folding, the tab and the tab 31 in the tab have a set angle and remain at this angle. When the tab is wound into a core structure 3, the tab 31 still maintains the pre-folded angle, as Figure 2 shown in the figure.

[0039] Continue to refer to Figure 1 As shown, in the embodiment of the present utility model, the tab pre-folding device 2 further includes a bending holding structure 23, and the bending holding structure 23 is used to keep the tab 31 at a set bending angle. Since the tab 31 is relatively thin and is prone to flipping during the conveyance process, therefore, by configuring the bending holding structure 23, the tab 31 can be kept at a certain angle for pre-folding operation.

[0040] For example, the bending holding structure 23 includes a guide block 231, which is located on one side of the bottom surface of the pole ear 31; the guide block 231 includes an inclined guide surface 232, the inclination angle of the guide surface 232 is the same as the bending angle of the pole ear 31, and the guide surface 232 is also provided with an adsorption hole, which is used to adsorb the pole ear 31 so that the pole ear 31 maintains a set bending angle. A plurality of adsorption holes are formed on the guide surface 232, such as a plurality of adsorption holes arranged in an array, and the adsorption holes are connected to a vacuum generating device, and the pole ear 31 can be adsorbed through the adsorption holes, wherein the adsorption force is controlled by the vacuum generating device to prevent the adsorption holes from adsorbing the pole ear 31 firmly on the guide surface 232, that is, the adsorption holes do not affect the normal transportation of the pole piece and the pole ear 31 while satisfying the maintenance of the bending angle of the pole ear 31.

[0041] like Figure 3 and Figure 4 As shown, in the embodiment of the utility model, the battery tab shaping device also includes a folding structure 4, which includes a first winding core fixing position 41 and a push block 42; the first winding core fixing position 41 is used to fix the winding core structure 3 after the pole piece is wound; the push block 42 is located on one side of the first winding core fixing position 41, and the push block 42 is used to push the tab 31 of the winding core structure 3 to gather toward the center of the winding core structure 3.

[0042] like Figure 2 As shown, after the pole ear 31 is prefabricated, it is wound to form a winding core structure 3, and the end of the winding core structure 3 includes a pole ear 31 with a set angle. The pushing block 42 pushes this part of the pole ear 31 from the outside to the inside to achieve the purpose of folding.

[0043] For example, the winding core structure 3 is moved to the first winding core fixing position 41 by a robot, and the winding core structure 3 is fixed on the first winding core fixing position 41. The specific fixing method is not limited, and methods such as snap connection and clamping can be used.

[0044] During the folding operation, the push block 42 starts from the pole ear 31 located at the edge position, and gradually pushes the pole ear 31 to bend and fold toward the middle position. For example, the folding structure 4 also includes a first telescopic member 43, which is connected to the push block 42 and is used to push the push block 42 to reciprocate in a straight line; the push block 42 is located on the outer side of the circumference of the winding core structure 3, and the push block 42 moves radially along the winding core structure 3 to push the pole ear 31 to gather toward the center of the winding core structure 3.

[0045] Among them, both ends of the winding core structure 3 include pole ears 31. Therefore, push blocks 42 are arranged on the pole ears 31 at both ends. Two push blocks 42 are arranged at both ends of the pole ears 31 respectively. The two push blocks 42 can cover the pole ears 31 on the same side, that is, the folding operation of the pole ears 31 on the same side can be completed through the two push blocks 42.

[0046] For example, the pushing block 42 includes a pushing surface 44; along the direction from the starting end to the ending end, the height of the pushing surface 44 gradually increases, so that the pushing force applied by the pushing surface 44 to the tab 31 gradually increases. By adopting the way of gradually increasing the pushing force, the tab 31 can be gradually flattened, and further ensure the flatness of the tab 31 after the closing (pre-flattening) operation.

[0047] As Figure 5 shown, in the embodiment of the present utility model, the battery tab shaping device further includes an end face shaping structure 5, and the end face shaping structure 5 includes a second core fixing position 51 and a shaping pressing block 52; the second core fixing position 51 is used for fixing the core structure 3; the shaping pressing block 52 is located outside the end face of the core structure 3, and the shaping pressing block 52 is used for pressing the tab 31 to adjust the flatness of the tab 31.

[0048] For the core structure 3 that has completed the closing operation, the tab 31 is in a pre-flattened state. The tab 31 in this state is shaped, and finally the required core structure 3 is obtained. Among them, during the shaping operation, the following operations need to be performed:

[0049] The end face shaping structure 5 further includes a distance measuring device and a second telescopic member 53. The distance measuring device is used for measuring the distance information between the shaping pressing block 52 and the surface of the tab 31; the second telescopic member 53 is connected to the shaping pressing block 52 and is used for driving the shaping pressing block 52 to move a set distance towards the tab 31 according to the distance information.

[0050] The pole piece has a tolerance, resulting in a height tolerance in the wound core structure 3. Setting a fixed displacement amount cannot ensure the pressing distance of the core structure 3. For example, the distance measuring device is a laser rangefinder. The laser rangefinder calculates the distance from the shaping pressing block 52 to the surface of the tab 31, and adjusts the displacement amount of the shaping pressing block 52 according to the measured distance, so as to ensure the uniform pressure of the end face shaping and the flatness of the end face.

[0051] The end face shaping structure 5 further includes a heating device. For example, the heating device is a heating plate, and the heating plate is placed inside the shaping pressing block 52. The heating device is used for adjusting the temperature of the shaping pressing block 52, so that the shaping pressing block 52 performs hot pressing on the tab 31. The tab 31 after hot pressing is not easy to rebound, thereby ensuring the consistency of shaping.

[0052] A battery tab shaping device provided by the present utility model performs a pre-folding operation on the tab 31 through a tab pre-folding device 2 before the folding operation. The pre-folding operation can form a crease at the root of the tab 31. Then, a tab 31 structure with higher flatness can be obtained through the folding and end face shaping operations. The technical solution of the present utility model forms a crease at the root of the tab 31, which is beneficial to the folding operation of the tab 31. The probability of deviation of the tab 31 during folding is low. Combined with the folding and shaping steps, the stacked cutting type shaping is completed. This tab 31 shaping method produces fewer metal chips compared to the flattening type shaping, which is convenient for the immersion of the electrolyte; and the tab 31 has high flatness, which is beneficial to the laser welding of the bus bar and the tab 31, and the current output uniformity is better.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0055] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present utility model, and all should be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A battery tab shaping device, characterized in that: It comprises a carrier (1) and a tab pre-folding device (2); The carrier (1) comprises a conveying surface (11), the conveying surface (11) is used to support the pole piece and to convey the pole piece to move, the pole ear (31) at the edge of the pole piece is located outside the conveying surface (11), and the pole ear pre-folding device (2) is located on the side of the conveying surface (11) where the pole ear (31) is located; The pole tab pre-folding device (2) comprises an upper pressing wheel (21) and a lower pressing wheel (22), the bottom end of the upper pressing wheel (21) and the top end of the lower pressing wheel (22) are arranged non-coplanar with the pole piece, and the bottom end of the upper pressing wheel (21) is used to press the top surface of the pole tab (31), and the top end of the lower pressing wheel (22) is used to press the bottom surface of the pole tab (31); The upper pressing wheel (21) and the lower pressing wheel (22) rotate synchronously with the conveyance of the pole lug (31), so that the pole lug (31) is bent at a set angle relative to the pole piece, and the bent pole piece forms a fold at the root of the pole lug (31).

2. A battery tab shaping device as claimed in claim 1, characterized in that: The heights of the bottom end of the upper pressing wheel (21) and the top end of the lower pressing wheel (22) are both lower than the height of the pole piece, and the upper pressing wheel (21) and the lower pressing wheel (22) are staggered in the height direction.

3. A battery tab shaping device as claimed in claim 2, characterized in that: The tab pre-folding device (2) further comprises a bending holding structure (23), wherein the bending holding structure (23) is used to keep the tab (31) at a set bending angle.

4. A battery tab shaping device as claimed in claim 3, characterized in that: The bending holding structure (23) comprises a guide block (231), and the guide block (231) is located on one side of the bottom surface of the pole lug (31); The guide block (231) comprises an inclined guide surface (232), the inclination angle of the guide surface (232) being the same as the bending angle of the pole lug (31), and the guide surface (232) is also provided with an adsorption hole, the adsorption hole being used to adsorb the pole lug (31) so that the pole lug (31) maintains a set bending angle.

5. The battery tab shaping device according to claim 1, characterized in that: It also includes a folding structure (4), wherein the folding structure (4) includes a first winding core fixing position (41) and a pushing block (42); The first winding core fixing position (41) is used to fix the winding core structure (3) after the pole piece is wound; The push block (42) is located on one side of the first winding core fixing position (41), and the push block (42) is used to push the pole lug (31) of the winding core structure (3) to gather toward the center of the winding core structure (3).

6. A battery tab shaping device as claimed in claim 5, characterized in that: The folding structure (4) further comprises a first telescopic member (43), wherein the first telescopic member (43) is connected to the push block (42) and is used to push the push block (42) to perform linear reciprocating motion; The push block (42) is located outside the peripheral surface of the winding core structure (3), and the push block (42) moves radially along the winding core structure (3) to push the pole lug (31) to gather toward the center of the winding core structure (3).

7. A battery tab shaping device as claimed in claim 6, characterized in that: The push block (42) includes a push surface (44); The height of the pushing surface (44) gradually increases from the starting end to the end end, so that the pushing force applied by the pushing surface (44) to the pole ear (31) gradually increases.

8. The battery tab shaping device according to claim 5, characterized in that: It also includes an end face shaping structure (5), wherein the end face shaping structure (5) includes a second winding core fixing position (51) and a shaping pressing block (52); The second winding core fixing position (51) is used to fix the winding core structure (3); The shaping pressing block (52) is located outside the end surface of the winding core structure (3), and the shaping pressing block (52) is used to press the pole lug (31) to adjust the flatness of the pole lug (31).

9. A battery tab shaping device as claimed in claim 8, characterized in that: The end face shaping structure (5) further comprises a distance measuring device and a second telescopic member (53), wherein the distance measuring device is used to measure distance information between the shaping pressing block (52) and the surface of the pole lug (31); The second telescopic member (53) is connected to the shaping pressing block (52) and is used to drive the shaping pressing block (52) to move a set distance toward the pole lug (31) according to the distance information.

10. The battery tab shaping device according to claim 8, characterized in that: The end face shaping structure (5) further comprises a heating device, wherein the heating device is used to adjust the temperature of the shaping pressing block (52) so that the shaping pressing block (52) performs hot pressing on the electrode tab (31).

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