Ultrasonic roll welding mechanism

Abstract

The utility model belongs to the technical field of battery processing, and discloses an ultrasonic roll welding mechanism. The ultrasonic roll welding mechanism comprises a bearing frame, a bottom plate and a top plate, and the bottom plate and the bearing frame are in sliding fit in the first direction; a first accommodating groove and a second accommodating groove are formed in the bottom plate, the first accommodating groove is used for accommodating a pole piece, the second accommodating groove is used for accommodating a metal foil material, and a pole lug of the pole piece extends into the second accommodating groove and is stacked with the metal foil material; the top plate covers the bottom plate and is used for pressing the pole pieces and the stacked metal foils and tabs; corresponding receding holes are formed in the bearing frame, the bottom plate and the top plate and used for allowing welding heads to stretch in so as to weld the stacked metal foils and the tabs. The ultrasonic roll welding mechanism ensures that the positions of the tabs and the metal foils are accurate in the welding process, displacement is avoided, and then the welding quality of roll welding is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery processing technical field especially relates to a kind of ultrasonic wave roll welding mechanisms. BACKGROUND

[0002] Pole piece tab welding is an important process step of lithium battery processing, for example, the pole piece or tab welding reserved length shorter pole piece using composite current collector, all need to be additionally lengthened and welded. The pole piece tab welding of lithium battery needs to weld the metal foil material same with pole piece tab base material on the front and back of pole piece, and its difficulty lies in the accuracy of positive and negative tab welding position, the coincidence degree of positive and negative tab, welding speed, welding power and post-welding firmness.

[0003] Before welding, it needs to ensure that the metal foil material and the pole piece tab base material are aligned and attached, so as to ensure the welding effect between the metal foil material and the pole piece tab base material. However, the roll welding mechanism in the prior art is prone to misalignment between the metal foil material and the tab base material, which affects the roll welding effect of the tab.

[0004] Therefore, it is urgent to design an ultrasonic wave roll welding mechanism to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an ultrasonic wave roll welding mechanism to ensure the accuracy of the position of the tab and the metal foil material during the welding process, without displacement, and to ensure the welding quality of roll welding.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The ultrasonic wave roll welding mechanism comprises a bearing frame, a bottom plate and a top plate, wherein the bottom plate and the bearing frame are slidingly connected in the first direction;

[0008] The first accommodating groove and the second accommodating groove are formed in the bottom plate, the first accommodating groove is used for accommodating the pole piece, and the second accommodating groove is used for accommodating the metal foil material. The tab of the pole piece extends into the second accommodating groove and is stacked with the metal foil material. The top plate is arranged on the bottom plate and is used for pressing the pole piece, the stacked metal foil material and the tab;

[0009] The bearing frame, the bottom plate and the top plate are provided with corresponding accommodation holes, and the welding head is inserted into the accommodation holes to weld the stacked metal foil material and the tab.

[0010] As an optional solution, the first accommodation hole is formed in the bearing frame, the second accommodation hole is formed in the second accommodating groove, and the third accommodation hole is formed in the top plate. At least part of the first accommodation hole, the second accommodation hole and the third accommodation hole are projected and coincided.

[0011] As an optional solution, the welding head is divided into a lower roller welding head and an upper roller welding head. Some of the lower roller welding heads can pass through the first clearance hole and the second clearance hole and abut against one of the electrode tabs or the metal foil. Some of the upper roller welding heads can pass through the third clearance hole and abut against the other of the electrode tabs or the metal foil, so as to weld the electrode tabs and the metal foil together with the lower roller welding head.

[0012] As an optional solution, the ultrasonic roll welding structure further includes two guide members, which are spaced apart on the support frame in the second direction. Each guide member extends along the first direction. The base plate can slide between the two guide members, and the distance between the two guide members is adapted to the distance between the base plate in the second direction. The first direction is perpendicular to the second direction.

[0013] As an alternative, the top plate, which is fastened to the base plate, extends at least partially between the two guide members, and the dimensions of the top plate in the second direction are adapted to the spacing between the two guide members.

[0014] As an alternative, the spacing between the two guide members described above is adjustable.

[0015] As an alternative, at least one of the aforementioned guide members has an elongated hole extending along the aforementioned second direction;

[0016] The ultrasonic roll welding mechanism also includes a locking component, which passes through the elongated hole to fix the guide component and the support frame.

[0017] As an alternative, the aforementioned top plate includes:

[0018] The body, on which the aforementioned clearance hole is provided;

[0019] Two limiting protrusions are both downwardly protruding from the body and spaced apart in the first direction. Both limiting protrusions extend along the second direction. The bottom plate is located between the two limiting protrusions. The first direction is perpendicular to the second direction.

[0020] As an alternative, the top plate is provided with at least two first receiving slots, and the at least two first receiving slots are arranged at intervals in a second direction, wherein the first direction is perpendicular to the second direction.

[0021] As an optional solution, the second receiving groove is a through groove extending along the first direction.

[0022] Alternatively, the second receiving slot is provided in a one-to-one correspondence with the first receiving slot.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model provides an ultrasonic roll welding mechanism. By opening a first and a second receiving groove on the base plate, the electrode and the metal foil are precisely positioned before roll welding. At this time, the electrode tab and the metal foil overlap at the clearance hole opened on the base plate, waiting for subsequent welding. Then, the top plate is fastened onto the base plate, thereby pressing the electrode and the metal foil firmly to prevent displacement of the electrode tab and the metal foil during the roll welding process. The upper roller welding head and the lower roller welding head approach each other, and after pressing the metal foil and the electrode tab to a certain extent, they stop approaching and then push the base plate along the first direction. The upper roller welding head and the lower roller welding head only roll, welding the metal foil and the electrode tab. Therefore, in the ultrasonic roll welding mechanism provided in this embodiment, the metal foil is well fixed during the roll welding process and will not move, thereby ensuring the welding quality of the roll welding. Attached Figure Description

[0025] Figure 1 The explosion of the ultrasonic roll welding mechanism provided in this embodiment of the utility model Figure 1 ;

[0026] Figure 2 This is a side view of the ultrasonic roll welding mechanism provided in an embodiment of the present utility model;

[0027] Figure 3 The explosion of the ultrasonic roll welding mechanism provided in this embodiment of the utility model Figure 2 .

[0028] In the picture:

[0029] 10. Support frame; 11. Supporting part; 111. First clearance hole; 12. Support part; 13. Anti-pressure part; 14. Accommodating space; 20. Base plate; 21. First accommodating groove; 22. Second accommodating groove; 23. Second clearance hole; 30. Top plate; 31. Body; 32. Limiting protrusion; 33. Third clearance hole; 34. Pressing protrusion; 40. Lower roller welding head; 50. Upper roller welding head;

[0030] 60. Guide component; 61. Elongated hole;

[0031] 800, metal foil; 900, electrode sheet; 910, electrode tab. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] This embodiment provides an ultrasonic roll welding mechanism to ensure the precise positioning of the electrode tab 910 and the metal foil 800 during the welding process, preventing displacement and thus ensuring the welding quality of the roll welding. Figure 1 As shown, the ultrasonic roll welding mechanism includes a support frame 10, a base plate 20, and a top plate 30. The base plate 20 and the support frame 10 are slidably fitted in a first direction (X direction in the figure). The base plate 20 has a first receiving groove 21 and a second receiving groove 22. The first receiving groove 21 is used to receive the electrode 900, and the second receiving groove 22 is used to receive the metal foil 800. The electrode tab 910 of the electrode 900 extends into the second receiving groove 22 and is stacked with the metal foil 800. The top plate 30 covers the base plate 20 and is used to press on the electrode 900 and the stacked metal foil 800 and electrode tab 910. The support frame 10, the base plate 20, and the top plate 300 have corresponding clearance holes for the welding head to extend into in order to weld the stacked metal foil 800 and electrode tab 910.

[0037] The aforementioned ultrasonic roll welding mechanism, by opening a first receiving groove 21 and a second receiving groove 22 on the base plate 20, allows the electrode 900 and the metal foil 800 to be precisely positioned before roll welding. At this time, the electrode tab 910 and the metal foil 800 have an overlapping part at the clearance hole opened in the base plate 20, waiting for subsequent welding. Then, the top plate 30 is fastened onto the base plate 20, thereby pressing the electrode 900 and the metal foil 800 firmly, avoiding misalignment of the electrode tab 910 and the metal foil 800 during the roll welding process, and ensuring the welding quality of the electrode tab 910 and the metal foil 800.

[0038] Optionally, such as Figure 1 As shown, the support frame 10 has a first clearance hole 111, the second receiving groove 22 has a second clearance hole 23, and the top plate 910 has a third clearance hole 33. The first clearance hole 111, the second clearance hole 23 and the third clearance hole 33 have at least partial projection overlap to achieve the avoidance of the welding head between the support frame 10, the bottom plate 20 and the top plate 30.

[0039] Optionally, see Figure 1 and Figure 2 The welding head is divided into a lower roller welding head 40 and an upper roller welding head 50. Part of the lower roller welding head 40 can pass through the first clearance hole 111 and the second clearance hole 23 and abut against either the electrode tab 910 or the metal foil 800. Part of the upper roller welding head 50 can pass through the third clearance hole 33 and abut against the other of the electrode tab 910 or the metal foil 800, so that together with the lower roller welding head 40, the electrode tab 910 and the metal foil 800 can be welded. It can be understood that by partially overlapping the projections of the first clearance hole 111, the second clearance hole 23, and the third clearance hole 33, it is ensured that the lower roller welding head 40 and the upper roller welding head 50 can contact the electrode tab 910 or the metal foil 800 for welding.

[0040] Meanwhile, in the prior art, the upper roller welding head 50 and the lower roller welding head 40 are generally moved horizontally to complete the continuous welding of the tab 910 in the first direction. This means that the two roller welding heads have both horizontal and rolling movements, which can easily cause the metal foil 800 and the tab 910 to shift. However, in this embodiment, the upper roller welding head 50 and the lower roller welding head 40 only roll, and the metal foil 800 and the tab 910 are moved by the base plate 20. This reduces the dragging of the metal foil 800 and the tab 910 by the roller welding heads during the welding process and further prevents the metal foil 800 or the tab 910 from shifting.

[0041] In this embodiment, as Figure 1As shown, during welding, the tab 910 is positioned above the metal foil 800. Therefore, the upper roller welding head 50 contacts the tab 910, and the lower roller welding head 40 contacts the metal foil 800. In another optional embodiment, during welding, the tab 910 can also be positioned below the metal foil 800. In this case, the upper roller welding head 50 contacts the metal foil 800, and the lower roller welding head 40 contacts the tab 910. Welding can be achieved in both stacking configurations, and no limitation is specified here.

[0042] It should be noted that the principle of roll welding is existing technology and will not be elaborated here.

[0043] In an alternative embodiment, such as Figure 1 As shown, the ultrasonic roll welding mechanism also includes two guide members 60. These two guide members 60 are spaced apart on the support frame 10 in a second direction (the Y direction in the figure, which is perpendicular to the X direction). Each guide member 60 extends along a first direction. The base plate 20 can slide between the two guide members 60, and the distance between the two guide members 60 matches the distance between the base plate 20 in the second direction. Through this arrangement, the two guide members 60 guide and limit the movement of the base plate 20.

[0044] Optionally, such as Figure 1 and Figure 3 As shown, at least a portion of the top plate 30, which is fastened to the base plate 20, extends between the two guide members 60, and the dimension of the top plate 30 in the second direction is adapted to the spacing between the two guide members 60. It can be understood that the two guide members 60 also simultaneously limit and guide the top plate 30; that is, the two guide members 60 simultaneously restrict the relative movement of the top plate 30 and the base plate 20 in the second direction, thus assisting in the stability of the fastening position of the base plate 20 and the top plate 30.

[0045] Optionally, the spacing between the two guide members 60 is adjustable. This configuration allows for guiding base plates 20 and top plates 30 of different sizes, increasing the adaptability of the ultrasonic welding mechanism.

[0046] In an alternative embodiment, such as Figure 1 As shown, at least one guide member 60 has an elongated hole 61 extending along the second direction; the ultrasonic roll welding mechanism also includes a locking member, which passes through the elongated hole 61 to fix the guide member 60 and the support frame 10; by tightening the locking member, the guide member 60 is fixed on the support frame 10, and by loosening the locking member, the position of the guide member 60 can be adjusted along the second direction.

[0047] In another alternative embodiment, the locking element includes a bolt and a nut, with the bolt threaded through an elongated hole 61 and connected to the nut by threads. This configuration can be applied when the wall thickness of the support frame 10 is relatively thin.

[0048] In another optional embodiment, in order to achieve a sliding fit between the base plate 20 and the support frame 10, a slider can be provided on the base plate 20 and a guide rail can be provided on the support frame 10, with the slider and the guide rail sliding fit together, which is not limited here.

[0049] The following is combined with Figure 1 The structure of the support frame 10 will be described, such as Figure 1 As shown, the support frame 10 includes a support portion 11 and at least two support portions 12. The support portion 11 serves as the top of the support frame 10; the at least two support portions 12 are all connected to the lower side of the support portion 11, so that a receiving space 14 is formed on the lower side of the support portion 11, and part of the lower roller welding head 40 is located in the receiving space 14. With the above arrangement, the lower roller welding head 40 can be received below the support portion 11, with a certain amount of room for movement.

[0050] Optionally, the support portion 12 is formed by extending downward from the opposite two sides of the bearing portion 11. That is, the support portion 12 is plate-shaped, which can play a certain role in dust prevention.

[0051] Optionally, the support frame 10 also includes two anti-pressure parts 13, which are arranged one-to-one with the two support parts 12. The anti-pressure parts 13 are connected to the end of the support part 12 away from the support part 11 and are arranged parallel to the support part 11. Through the above arrangement, the anti-pressure parts 13 have a certain surface area to prevent the support part 12 from causing too much pressure on the ground or the installed table, thus avoiding damage to the ground or the installed table.

[0052] In another alternative embodiment, the support portion 12 may also be rod-shaped and disposed at the four corners of the bearing portion 11, which is not limited here.

[0053] Optionally, such as Figure 1 As shown, the top plate 30 includes a body 31 and two limiting protrusions 32. A third clearance hole 33 is provided on the body 31. The two limiting protrusions 32 are both downwardly protruding from the body 31 and spaced apart in a first direction. The two limiting protrusions 32 extend along a second direction, and the bottom plate 20 is positioned between the two limiting protrusions 32. With the above arrangement, after the top plate 30 is fastened to the bottom plate 20, the two limiting protrusions 32 play a limiting role relative to the bottom plate 20 in the first direction, and the two guide members 60 play a limiting role in the second direction. From this point on, during the sliding process of the bottom plate 20, the relative position of the top plate 30 and the bottom plate 20 is fixed, thereby ensuring that the position of the electrode 900 and the metal foil 800 relative to the bottom plate 20 is fixed, and the metal foil 800 or the electrode 900 will not move due to the movement of the top plate 30.

[0054] Optionally, such as Figure 1As shown, the top plate 30 also includes a pressing protrusion 34, which protrudes downward from the body 31 and is used to press the electrode 900 to increase the pressing force on the electrode 900.

[0055] In this embodiment, two first receiving grooves 21 are formed on the top plate 30, and the two first receiving grooves 21 are arranged at intervals in the second direction. This allows for simultaneous welding of two electrode tabs 910. In other embodiments, the number of first receiving grooves 21 may be three, four, five, or more, and is not limited here.

[0056] In this embodiment, as Figure 1 As shown, the second receiving groove 22 is a through groove extending along the first direction, which facilitates the processing of the second receiving groove 22. At the same time, a metal foil 800 is simultaneously welded to two or more tabs 910.

[0057] Accordingly, in this embodiment, the length of the first clearance hole 111 can be set to be relatively short, only requiring the top of the lower roller welding head 40 to pass through. The second clearance hole 23 and the third clearance hole 33, however, need to cover both first receiving grooves 21, and therefore are set to be relatively long.

[0058] In another embodiment, the second receiving groove 22 is provided in a one-to-one correspondence with the first receiving groove 21, and the metal foil 800 is also provided in a one-to-one correspondence with the tab 910, which is not limited here.

[0059] It should be noted that when a metal foil 800 is welded to two or more tabs 910, a subsequent cutting process is required, which will not be elaborated here.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An ultrasonic roll welding mechanism, characterized in that, It includes a support frame (10), a base plate (20) and a top plate (30), wherein the base plate (20) and the support frame (10) are slidably engaged in a first direction; The base plate (20) has a first receiving groove (21) and a second receiving groove (22). The first receiving groove (21) is used to receive the electrode (900), and the second receiving groove (22) is used to receive the metal foil (800). The tab (910) of the electrode (900) extends into the second receiving groove (22) and is stacked with the metal foil (800). The top plate (30) covers the base plate (20) and is used to press the electrode (900) and the stacked metal foil (800) and the tab (910). The support frame (10), the bottom plate (20) and the top plate (30) are provided with corresponding clearance holes, which are used for the welding head to extend into in order to weld the stacked metal foil (800) to the tab (910).

2. The ultrasonic roll welding mechanism according to claim 1, characterized in that, The support frame (10) has a first clearance hole (111), the second receiving groove (22) has a second clearance hole (23), and the top plate (30) has a third clearance hole (33). The first clearance hole (111), the second clearance hole (23) and the third clearance hole (33) have at least partial projection overlap.

3. The ultrasonic roll welding mechanism according to claim 2, characterized in that, The welding head is divided into a lower roller welding head (40) and an upper roller welding head (50). Part of the lower roller welding head (40) can pass through the first clearance hole (111) and the second clearance hole (23) and then abut against one of the electrode tab (910) or the metal foil (800). Part of the upper roller welding head (50) can pass through the third clearance hole (33) and then abut against the other of the electrode tab (910) or the metal foil (800).

4. The ultrasonic roll welding mechanism according to claim 1, characterized in that, The ultrasonic roll welding structure also includes two guide members (60), which are installed at intervals on the support frame (10) in the second direction. Each guide member (60) extends along the first direction. The base plate (20) can slide between the two guide members (60), and the distance between the two guide members (60) is adapted to the distance between the base plate (20) in the second direction. The first direction is perpendicular to the second direction.

5. The ultrasonic roll welding mechanism according to claim 4, characterized in that, The top plate (30) fastened to the base plate (20) extends at least partially between the two guide members (60), and the dimension of the top plate (30) in the second direction is adapted to the spacing between the two guide members (60).

6. The ultrasonic roll welding mechanism according to claim 5, characterized in that, The spacing between the two guide members (60) is adjustable.

7. The ultrasonic roll welding mechanism according to claim 6, characterized in that, At least one of the guide members (60) has an elongated hole (61) extending along the second direction; The ultrasonic rolling welding mechanism also includes a locking member, which passes through the elongated hole (61) to fix the guide member (60) and the support frame (10).

8. The ultrasonic roll welding mechanism according to any one of claims 1-5, characterized in that, The top plate (30) includes: The body (31) has the clearance hole provided on it; Two limiting protrusions (32) are both downwardly protruding from the body (31) and spaced apart in the first direction. Both limiting protrusions (32) extend along the second direction. The bottom plate (20) can be limited between the two limiting protrusions (32). The first direction is perpendicular to the second direction.

9. The ultrasonic roll welding mechanism according to any one of claims 1-5, characterized in that, At least two first receiving slots (21) are provided on the top plate (30), and the at least two first receiving slots (21) are arranged at intervals in a second direction, the first direction being perpendicular to the second direction.

10. The ultrasonic roll welding mechanism according to claim 9, characterized in that, The second receiving groove (22) is a through groove extending along the first direction; Alternatively, the second receiving slot (22) may be provided in a one-to-one correspondence with the first receiving slot (21).

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