Tab pre-folding device and battery cell winding equipment

Abstract

The utility model provides a tab pre-folding device and battery cell winding equipment, the tab pre-folding device comprises a support, a pre-folding assembly and an adjusting assembly, the support comprises a first support and a second support, and the second support can rotate relative to the first support; the pre-folding assembly comprises a supporting shaft and guide wheels, the supporting shaft is arranged on the second support, and at least one guide wheel is arranged on the supporting shaft in a penetrating mode and provided with a guide face. The adjusting assembly is arranged on the first support and used for adjusting the distance between the guide wheel and the center shaft of the battery cell when the battery cell is wound, so that the guide wheel moves along with the battery cell, the guide face abuts against the electrode lug of the battery cell, and the electrode lug is pre-bent. According to the pre-bending device, the guide wheel can be always propped against the surface of the tab, and the tab can be continuously pre-bent by the guide wheel in the winding process of the battery cell, so that each layer of tab of the battery cell can be tightly attached, and the pre-bending precision of the tab can be favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, and in particular to a tab pre-folding device and a battery core winding device. Background Art

[0002] With the pursuit of high-energy and high-rate performance in power batteries, multi-tab batteries have emerged. After the positive electrode sheets, negative electrode sheets, and separators are stacked and wound in sequence to form a multi-tab battery cell, the multi-tab battery cell is usually formed by flattening or pressing. The flattening method produces a large amount of metal shavings, which can reduce the safety performance of the battery cell and thus affect the use of the battery cell. The tabs need to be pre-folded before flattening. If the tabs are not pre-bent, they will bend multiple times after pressing. This multiple bending of the tabs will not only affect the welding effect, but also increase the space occupied by the tabs after flattening.

[0003] The current tab pre-bending method generally uses a bending roller to press the tab on the roller to bend the tab, but the existing pre-bending device has the problem of poor pre-bending accuracy. Utility Model Content

[0004] The utility model aims to solve the problem of poor pre-folding precision in the existing tab pre-folding device.

[0005] In order to solve the above problems, the first aspect of the present invention provides a tab pre-folding device, comprising:

[0006] A bracket, the bracket comprising a first bracket and a second bracket, wherein the second bracket is rotatable relative to the first bracket;

[0007] A pre-folding assembly, the pre-folding assembly comprising a support shaft and a guide wheel, the support shaft being arranged on the second bracket, at least one guide wheel being passed through the support shaft, and the guide wheel having a guide surface;

[0008] An adjustment component is provided on the first bracket, and the adjustment component is used to adjust the distance between the guide wheel and the central axis of the battery cell when winding the battery cell, so that the guide wheel moves with the battery cell and the guide surface is pressed against the pole ear of the battery cell to pre-bend the pole ear.

[0009] Furthermore, the adjustment assembly includes a first driving member and a connecting member, one end of the connecting member is connected to the second bracket, and the other end of the connecting member is connected to the first driving member. The first driving member drives the connecting member to drive the second bracket and the support shaft arranged on the second bracket to rotate relative to the first bracket, so that the guide wheel moves with the battery cell and the guide surface is pressed against the pole ear.

[0010] Furthermore, the connecting member includes a joint bearing and a connecting arm, one end of the joint bearing is connected to the first driving member, the other end of the joint bearing is connected to one end of the connecting arm, and the other end of the connecting arm is connected to the first bracket.

[0011] Furthermore, it also includes a fixing part, a through hole is opened on the connecting arm, the fixing part passes through the through hole to connect the connecting arm with the first bracket, and the fixing part serves as the fulcrum of the connecting arm, so that the connecting arm can rotate around the fixing part.

[0012] Furthermore, the first driving member is a cylinder, and a rod of the cylinder is connected to one end of the spherical bearing.

[0013] Furthermore, a first guide wheel and a second guide wheel are provided on the support shaft, the first guide wheel and the second guide wheel are respectively in contact with two tabs of the battery cell, and the preset distance between the first guide wheel and the second guide wheel is adjustable.

[0014] Furthermore, a first locking member, a second locking member and a first elastic member are provided on the support shaft, the first locking member and the second locking member are passed through the support shaft, the first locking member and the second locking member can move relative to the support shaft and can be locked with the support shaft, the first guide wheel is located between the first locking member and the second locking member, the first elastic member is provided between the first locking member and the first guide wheel, and the first elastic member can press the first guide wheel against the second locking member.

[0015] Furthermore, a third locking member and a second elastic member are provided on the support shaft, and the third locking member is passed through the support shaft. The third locking member can move relative to the support shaft and can be locked with the support shaft. The second guide wheel is located between the third locking member and the second bracket, and the second elastic member is provided between the second guide wheel and the second bracket. The second elastic member can press the second guide wheel against the third locking member.

[0016] Furthermore, a pressure wheel is provided on the support shaft. The pressure wheel is passed through the support shaft. The pressure wheel is located between the first guide wheel and the second guide wheel, and the pressure wheel is arranged close to the second guide wheel. The pressure wheel is used to press against the battery cell.

[0017] The second aspect of the present invention provides a battery cell winding device, including a winding device and a tab pre-folding device as described in the first aspect, wherein the winding device is used to wind the pole sheet into a battery cell, and the tab pre-folding device is used to cooperate with the winding device to bend the tab of the battery cell during the winding process of the battery cell.

[0018] The tab pre-folding device and battery cell winding equipment described in the present invention are configured such that a support shaft is arranged on a second bracket, an adjustment component is arranged on a first bracket, and the second bracket can rotate relative to the first bracket. The adjustment component can adjust the distance between the guide wheel and the central axis of the battery cell, so that the guide wheel moves with the battery cell and the guide wheel is pressed against the tab of the battery cell to pre-bend the tab. Therefore, in the process of winding the battery cell, as the tab gradually increases with the radius of the battery cell, the adjustment component can gradually increase the distance between the guide wheel and the central axis of the battery cell with the radius of the battery cell, so that the guide wheel can move with the tab, so that the guide wheel is always pressed against the surface of the tab. In the process of winding the battery cell, the guide wheel continuously pre-bends the tab, so that the tabs of each layer of the battery cell can fit tightly together, which is beneficial to improving the pre-bending accuracy of the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view structural diagram of the tab pre-folding device provided in an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the tab pre-folding device provided in an embodiment of the present utility model;

[0021] Figure 3 It is a side structural schematic diagram of the tab pre-folding device provided in an embodiment of the present utility model;

[0022] Figure 4 A schematic diagram of a state in which a battery cell winding device provided in an embodiment of the present utility model is winding a battery cell;

[0023] Figure 5 This is a schematic diagram of another state of the battery cell winding device provided in an embodiment of the present utility model winding the battery cell. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described clearly and in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In addition, in the description of the present invention, the meaning of "at least one" is one or more, unless otherwise clearly and specifically defined.

[0025] In this specification, the term "as an alternative embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one alternative embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0026] Combine Figures 1 to 3 As shown, the first aspect of this embodiment provides a tab pre-folding device, comprising: a fixing base 10 and a bracket 20 installed on the fixing base 10, a pre-folding assembly 30 and an adjustment assembly 40, wherein: the bracket 20 comprises a first bracket 21 and a second bracket 22, the first bracket 21 is fixedly set on the fixing base 10, and the second bracket 22 can rotate relative to the first bracket 21.

[0027] The pre-folding assembly 30 includes a support shaft 31, a guide wheel 32 and a pressure wheel 33. The support shaft 31 is passed through the second bracket 22. At least one guide wheel 32 and a pressure wheel 33 are passed through the support shaft 31. The pressure wheel 33 is used to press against the battery cell to prevent the battery cell from bulging. The guide wheel 32 is used to press against the tab of the battery cell, and the guide wheel 32 has a guide surface.

[0028] The adjustment component 40 is arranged on the first bracket 21. The adjustment component 40 is used to adjust the distance between the guide wheel 32 and the central axis of the battery cell when the electrode is wound into a battery cell, so that the guide wheel 32 moves with the battery cell and the guide surface of the guide wheel 32 is pressed against the electrode ear of the battery cell to pre-bend the electrode ear. Therefore, when the electrode starts to wind around the battery cell, the support shaft 31 approaches the battery cell, so that the pressure wheel 33 is close to the battery cell, and the guide surface of the guide wheel 32 is close to the electrode ear of the battery cell. When the battery cell starts to wind, the electrode ear rotated to the guide wheel 32 is pre-folded by the guide wheel 32. During the winding process of the battery cell, the electrode ear gradually increases with the radius of the battery cell. The adjustment component 40 adjusts the distance between the guide wheel 32 and the central axis of the battery cell, so that the distance between the guide wheel 32 and the central axis of the battery cell gradually increases with the radius of the battery cell, so that the guide wheel 32 is always pressed against the surface of the electrode ear. During the winding process of the battery cell, the guide wheel 32 continues to pre-bend the electrode ear, so that the electrode ears of each layer of the battery cell can be close to each other, which is beneficial to improve the pre-bending accuracy of the electrode ear.

[0029] On the basis of the above embodiment, as an optional implementation, the adjustment component 40 includes a first driving member 41 and a connecting member, one end of the connecting member is connected to the second bracket 22, and the other end of the connecting member is connected to the first driving member 41. The first driving member 41 drives the second bracket 22 and the support shaft 31 arranged on the second bracket 22 to rotate relative to the first bracket 21 by driving the connecting member, so that the support shaft 31 and the guide wheel 32 located on the support shaft 31 are close to the battery cell, so that the guide surface of the guide wheel 32 can be close to the pole ear of the battery cell, and in the process of the pole ear gradually increasing with the radius of the battery cell, the guide wheel 32 pressed against the surface of the pole ear can move with the pole ear, so that the guide wheel 32 is always pressed against the surface of the pole ear.

[0030] Combine Figure 3As shown, based on the above embodiment, as an optional embodiment, the connecting member includes a spherical bearing 42 and a connecting arm 43. One end of the spherical bearing 42 is connected to the first driving member 41, and the other end of the spherical bearing 42 is connected to one end of the connecting arm 43. The other end of the connecting arm 43 is connected to the second bracket 22. A through hole is formed in the connecting arm 43, and the fixing member 23 passes through the through hole to connect the connecting arm 43 to the first bracket 21. The fixing member 23 serves as a fulcrum for the connecting arm 43, allowing the connecting arm 43 to rotate around the fixing member 23. Thus, the first driving member 41 drives the spherical bearing 42 to drive the connecting arm 43 to rotate around the fixing member 23, and the connecting arm 43 drives the second bracket 22 to rotate, causing the support shaft 32 and the guide wheel 32 provided on the second bracket 22 to rotate together with the second bracket 22. This ensures that when the tab gradually increases with the radius of the battery cell, the guide wheel 32 always presses against the surface of the tab, and the guide surface is in close contact with the surface of the tab. By setting a joint bearing to connect the first driving member 41 and the connecting arm 43, linear motion can be converted into curved motion, so that the connecting arm 43 rotates around the fixing member 23, which can improve the fit between the guide wheel 32 and the surface of the tab; by setting the fixing member 23 and using the fixing member 23 as the fulcrum of the connecting arm 43, the stability of the connecting arm 43 in driving the second bracket 22 to rotate can be improved, thereby improving the stability of the guide wheel 32 in pre-folding the tab, which is conducive to further improving the accuracy of the tab pre-folding.

[0031] On the basis of the above embodiment, as an optional implementation manner, the first driving member 41 is a cylinder, and the rod of the cylinder is connected to one end of the joint bearing 42. Thus, through the connection between the cylinder and the joint bearing 42, the cylinder can timely drive the connecting arm 43 to rotate around the fixed member 23 through the joint bearing 42. Compared with the motor drive, the cylinder drive has no hysteresis, and the cylinder can enable the guide wheel 32 to apply and maintain a certain pre-folding pressure on the pole ear, and can timely adjust the size of the pre-folding pressure applied by the guide wheel 32 on the pole ear, which is beneficial to improving the pre-folding accuracy of the pole ear. In addition, the space occupied by the cylinder is small, and it is beneficial to reduce the cost of the pole ear pre-folding device.

[0032] Based on the above embodiment, as an optional implementation, the guide wheel 32 includes a first guide wheel 321 and a second guide wheel 322. The first guide wheel 321 and the second guide wheel 322 are both provided on the support shaft 31. The pressure wheel 33 is located between the first guide wheel 321 and the second guide wheel 322. The first guide wheel 321 and the second guide wheel 322 are respectively used to press against the tabs at both ends of the battery cell. The first guide wheel 321 and the second guide wheel 322 are spaced apart by a preset distance along the axial direction of the support shaft 31, and the preset distance between the first guide wheel 321 and the second guide wheel 322 is adjustable. Therefore, by adjusting the preset distance between the first guide wheel 321 and the second guide wheel 322 along the axial direction of the support shaft 31, the size requirements of different battery cells can be matched, so that the tab pre-folding device can be compatible with battery cells of different sizes, thereby improving the applicability of the tab pre-folding device.

[0033] Combine Figure 1 As shown, based on the above embodiment, as an optional embodiment, the support shaft 31 is further provided with a first locking member 34, a second locking member 35 and a first elastic member 36. The first locking member 34 and the second locking member 35 are passed through the support shaft 31. The first locking member 34 and the second locking member 35 can move relative to the support shaft 31 and can be locked with the support shaft 31. The first guide wheel 321 is located between the first locking member 34 and the second locking member 35. Specifically, the first locking member 34 and the second locking member 35 can move along the support shaft 31 to a locked position. The first locking member 34 and the second locking member 35 can be provided with threaded holes. By passing the threaded members through the threaded holes, the first locking member 34 and the second locking member 35 can be locked to the support shaft 21, thereby limiting the position of the first guide wheel 321 so that the position of the first guide wheel 321 can be aligned with the tab position on the battery cell. The first elastic member 36 is disposed between the first locking member 34 and the first guide wheel 321. The first elastic member 36 can press the first guide wheel 321 against the second locking member 35. Thus, by providing the first elastic member 36, the first guide wheel 321 can elastically press against the tab when pressing against the tab, thereby preventing the tab from being subjected to excessive force and breaking due to rigid pressure. As an alternative embodiment, the first elastic member 36 can be a spring.

[0034] Combine Figure 1As shown, on the basis of the above embodiment, as an optional implementation manner, a third locking member 37 and a second elastic member 38 are further provided on the support shaft 31, and the third locking member 37 is passed through the support shaft 31. The third locking member 37 can move relative to the support shaft 31 and can be locked with the support shaft 31. The second guide wheel 322 and the third locking member 37 are both located between the second bracket 22, and the second guide wheel 322 is located between the third locking member 37 and the second bracket 22. Specifically, the second bracket 22 has four mounting plates, which are arranged along the axial direction of the support shaft 31. Each of the four mounting plates has a through hole, and the support shaft 31 is installed on the second bracket 22 through the through hole. Two mounting plates are arranged at both ends of the support shaft 31, respectively named the first mounting plate and the fourth mounting plate. The other two mounting plates are located between the first mounting plate and the fourth mounting plate, respectively named the second mounting plate and the third mounting plate. The pressure wheel 33 is arranged between the second mounting plate and the third mounting plate. The second guide wheel 322 is arranged near the pressure wheel 33. The second guide wheel 322 and the third locking member 37 are arranged between the third mounting plate and the fourth mounting plate. The third mounting plate and the fourth mounting plate limit the movement range of the third locking member 37 and the second guide wheel 322. The third locking member 37 can be moved along the support shaft 31 to a locking position. The third locking member 37 can be provided with a threaded hole. By inserting a threaded member through the threaded hole, the third locking member 37 can be locked to the support shaft 21. The position of the second guide wheel 322 can be fine-tuned by the third locking member 37. The second elastic member 38 is disposed between the second guide wheel 322 and the second bracket 22. The second elastic member 38 can press the second guide wheel 322 against the third locking member 37. Specifically, the second elastic member 38 is disposed between the second guide wheel and the fourth mounting plate. Thus, by providing the second elastic member 38, when the second guide wheel 322 presses against the tab, the second elastic member 38 allows the second guide wheel 322 to elastically press against the tab, thereby preventing the tab from being subjected to excessive force and breaking due to rigid pressure. Simultaneously, the compression of the second elastic member 38 can be adjusted by moving the third locking member 37, thereby adjusting the pressure of the second guide wheel 322 against the tab. As an alternative embodiment, the second elastic member 38 can be a spring.

[0035] Based on the above embodiment, as an optional implementation, the guide surfaces of the first guide wheel 321 and the second guide wheel 322 are both conical. This facilitates the guide surfaces to pre-bend the tabs along a specific direction and angle. It should be noted that the bevel angles of the guide surfaces of the first guide wheel 321 and the second guide wheel 322 are not further limited in this embodiment. Those skilled in the art can replace guide wheels with different bevel angles based on the preset bending angles of the tabs, thereby expanding the compatibility range of different battery cells.

[0036] Combine Figure 4 and Figure 5As shown, the second aspect of this embodiment provides a battery cell winding device, comprising a winding device 100 and a tab pre-folding device 200 as described in the first aspect. The winding device 100 is used to wind the positive electrode sheet, the negative electrode sheet, and the separator into a battery cell 1. The tab pre-folding device 200 is used to cooperate with the winding device 100 to pre-bend the tabs of the battery cell 1 during the winding process of the battery cell 1. Thus, the tabs are pre-bent by the tab pre-folding device 200. The tab pre-folding device 200 can always press against the surface of the tabs, continuously pre-folding the tabs during the winding process of the battery cell, so that the tabs of each layer of the battery cell can be tightly attached, which is conducive to improving the pre-bending accuracy of the tabs, thereby facilitating the subsequent flattening of the tabs of the battery cell and improving the flattening effect of the tabs.

[0037] The following combination Figure 4 and Figure 5 The working principle of the battery cell winding device in this embodiment is described as follows:

[0038] After the positive electrode sheet, the negative electrode sheet and the separator are inserted into the winding device 100, the winding device 100 drives the positive electrode sheet, the negative electrode sheet and the separator to rotate, the tab pre-folding device 200 approaches the battery cell 1, and the pressing wheel 33 is close to the battery cell 1, so that the first guide wheel 321 and the second guide wheel 322 are close to the tab of the battery cell 1 (such as Figure 4 As shown in FIG5 , when the winding device 100 drives the battery cell 1 to wind, the radius of the battery cell 1 gradually increases, and the tab gradually increases along with the radius of the battery cell 1. In the process of the tab increasing, the first driving member 41 drives the connecting arm 43 to rotate around the fixing member 23 by driving the joint bearing 42, and the connecting arm 43 drives the second bracket 22 to rotate, so that the first guide wheel 321 and the second guide wheel 322 provided on the second bracket 22 move together with the tab, so that the first guide wheel 321 and the second guide wheel 322 are always pressed against the surface of the tab, and the first guide wheel 321 and the second guide wheel 322 continue to pre-fold the tab during the winding process of the battery cell (as shown in FIG5 ). Figure 5 ), until the winding of the battery cell 1 is completed.

[0039] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A tab pre-folding device, characterized in that: include: A bracket, the bracket comprising a first bracket and a second bracket, wherein the second bracket is rotatable relative to the first bracket; A pre-folding assembly, the pre-folding assembly comprising a support shaft and a guide wheel, the support shaft being arranged on the second bracket, at least one guide wheel being passed through the support shaft, and the guide wheel having a guide surface; An adjustment component is provided on the first bracket, and the adjustment component is used to adjust the distance between the guide wheel and the central axis of the battery cell when winding the battery cell, so that the guide wheel moves with the battery cell and the guide surface is pressed against the pole ear of the battery cell to pre-bend the pole ear.

2. The tab pre-folding device according to claim 1, characterized in that: The adjustment assembly includes a first driving member and a connecting member, one end of the connecting member is connected to the second bracket, and the other end of the connecting member is connected to the first driving member. The first driving member drives the connecting member to drive the second bracket and the support shaft provided on the second bracket to rotate relative to the first bracket, so that the guide wheel moves with the battery cell and the guide surface is pressed against the pole ear.

3. The tab pre-folding device according to claim 2, characterized in that: The connecting member includes a joint bearing and a connecting arm, one end of the joint bearing is connected to the first driving member, the other end of the joint bearing is connected to one end of the connecting arm, and the other end of the connecting arm is connected to the first bracket.

4. The tab pre-folding device according to claim 3, characterized in that: It also includes a fixing piece. A through hole is opened on the connecting arm. The fixing piece passes through the through hole to connect the connecting arm to the first bracket. The fixing piece serves as a fulcrum of the connecting arm, so that the connecting arm can rotate around the fixing piece.

5. The tab pre-folding device according to claim 3, characterized in that: The first driving member is a cylinder, and the rod of the cylinder is connected to one end of the spherical bearing.

6. The tab pre-folding device according to claim 1, characterized in that: The support shaft is provided with a first guide wheel and a second guide wheel. The first guide wheel and the second guide wheel are respectively in contact with two tabs of the battery cell. The preset distance between the first guide wheel and the second guide wheel is adjustable.

7. The tab pre-folding device according to claim 6, characterized in that: The support shaft is also provided with a first locking member, a second locking member and a first elastic member, the first locking member and the second locking member are passed through the support shaft, the first locking member and the second locking member can move relative to the support shaft and can be locked with the support shaft, the first guide wheel is located between the first locking member and the second locking member, the first elastic member is provided between the first locking member and the first guide wheel, and the first elastic member can press the first guide wheel against the second locking member.

8. The tab pre-folding device according to claim 6, characterized in that: The support shaft is also provided with a third locking member and a second elastic member. The third locking member is passed through the support shaft. The third locking member can move relative to the support shaft and can be locked with the support shaft. The second guide wheel is located between the third locking member and the second bracket. The second elastic member is provided between the second guide wheel and the second bracket. The second elastic member can press the second guide wheel against the third locking member.

9. The tab pre-folding device according to claim 6, characterized in that: A pressure wheel is also provided on the support shaft. The pressure wheel is passed through the support shaft and is located between the first guide wheel and the second guide wheel. The pressure wheel is arranged close to the second guide wheel and is used to press against the battery cell.

10. A battery core winding device, characterized in that: It comprises a winding device and a tab pre-folding device as described in any one of claims 1 to 9, wherein the winding device is used to wind the pole sheet into a battery cell, and the tab pre-folding device is used to cooperate with the winding device to bend the tab of the battery cell during the winding process of the battery cell.

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