Ultrasonic welding tab protection mechanism and ultrasonic welding device

Abstract

The utility model relates to the technical field of battery production, and discloses an ultrasonic welding tab protection mechanism and an ultrasonic welding device.The ultrasonic welding tab protection mechanism comprises an abutting part and a connecting part, the thickness of the abutting part extends in the Z direction, and an avoiding hole is formed in the abutting part in a penetrating mode in the Z direction; the connecting part is fixedly connected with the edge of the abutting part, the connecting part is used for being in transmission connection with a driving part of the ultrasonic welding device, the driving part can drive the connecting part to drive the abutting part to move in the Z direction so that the abutting part can abut against the side face, in the Z direction, of the tab, and the welding area of the tab is exposed out of the receding hole. According to the utility model, the tab is pressed by the pressing part, so that the tab can be prevented from being torn, warped or wrinkled in the ultrasonic welding process, and the aims of reducing the NG rate of a product and improving the yield are fulfilled with low cost and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, and in particular to an ultrasonic welding electrode tab protection mechanism and an ultrasonic welding device. Background Technology

[0002] With the expansion of the power and energy storage market, the demand for rechargeable batteries is increasing year by year, and their manufacturing technology is also gradually being innovated. Currently, the main types of batteries on the market are square aluminum-cased batteries, cylindrical batteries, and pouch batteries. Among them, the manufacturing of square aluminum-cased batteries mainly involves preparing cells from the electrode sheets after die cutting using a winding machine or a stacking machine. For example, the LF628K cell has a large capacity and volume parameters. During the assembly process, ultrasonic welding is required between the tabs and the adapter plates. Because the tabs are relatively thin, high-frequency vibrations are generated during the ultrasonic final welding process. Without a tab protection mechanism, the tabs may tear or wrinkle, resulting in a low product yield. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide an ultrasonic welding tab protection mechanism and an ultrasonic welding device, which can prevent the tab from tearing, warping or wrinkling during ultrasonic welding, thereby improving the ultrasonic welding quality and product yield.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An ultrasonic welding electrode tab protection mechanism is provided, comprising:

[0006] The pressing part has a thickness that extends along the Z direction, and the pressing part is provided with a clearance hole through the Z direction;

[0007] The connecting part is fixedly connected to the edge of the pressing part. The connecting part is used for transmission connection with the driving part of the ultrasonic welding device. The driving part can drive the connecting part to move the pressing part along the Z direction so that the pressing part abuts against one side of the electrode tab along the Z direction. The welding area of ​​the electrode tab is exposed in the clearance hole.

[0008] As a further embodiment of the ultrasonic welding tab protection mechanism, the length of the pressing part extends along the X direction, the number of the clearance holes is two, the two clearance holes are distributed at intervals along the X direction, the clearance holes are adjacent to the edge of the battery cell connected to the tab near the pressing part, and the X direction is perpendicular to the Z direction.

[0009] As a further scheme of the ultrasonic welding tab protection mechanism, the pressing part is provided with a avoiding groove on the side thereof facing the tab in the Z direction, the avoiding groove is open on both sides thereof in the Y direction away from the battery and in the Z direction facing the tab, the avoiding groove corresponds to the position of the adapter sheet below the tab, and the X direction, the Y direction and the Z direction are perpendicular to each other.

[0010] As a further scheme of the ultrasonic welding tab protection mechanism, a side protection part is further included, the side protection part is fixed on the side of the pressing part adjacent to the battery in the Y direction, and the side protection part protrudes on the side of the pressing part away from the tab in the Z direction, and the X direction, the Y direction and the Z direction are perpendicular to each other.

[0011] As a further scheme of the ultrasonic welding tab protection mechanism, the side protection part exceeds the avoiding hole on both sides thereof in the X direction and is adjacent to both sides of the battery in the X direction.

[0012] As a further scheme of the ultrasonic welding tab protection mechanism, one end of the pressing part in the X direction is connected perpendicularly to the connecting part.

[0013] As a further scheme of the ultrasonic welding tab protection mechanism, the thickness of the connecting part extends in the X direction, at least two connecting holes are provided through the thickness of the connecting part, and the output end of the driving part is connected to the two connecting holes through bolts respectively.

[0014] As a further scheme of the ultrasonic welding tab protection mechanism, the two connecting holes are arranged at intervals in the Y direction, the connecting holes are long hole structures, the length of the connecting holes extends in the Z direction, and the X direction, the Y direction and the Z direction are perpendicular to each other.

[0015] As a further scheme of the ultrasonic welding tab protection mechanism, the pressing part is provided with a notch adjacent to the connecting part, and the notch is on the side of the pressing part facing the tab.

[0016] On the other hand, an ultrasonic welding device is provided, which includes a driving part, a pressing plate and an ultrasonic welding tab protection mechanism, the output end of the driving part is in transmission connection with the connecting part of the pressing plate and the ultrasonic welding tab protection mechanism, a battery is connected to the tab, the driving part can synchronously drive the pressing plate and the pressing part to move in the Z direction synchronously, so that the pressing plate presses the battery and the pressing part presses the tab.

[0017] Advantages:

[0018] The utility model discloses, the side surface protection part is arranged on the side of the abutting and pressing part adjacent to the electric core, can avoid welding dust to pollute the electric core, improved welding quality and product yield.

[0019] The utility model discloses, the side surface protection part is arranged on the side of the abutting and pressing part adjacent to the electric core, can avoid welding dust to pollute the electric core, improved welding quality and product yield.

[0020] The utility model discloses on the basis of original ultrasonic welding device increased ultrasonic welding tab protection mechanism, two kinds of ultrasonic welding tab protection mechanism that mirror image symmetry are designed to positive pole tab and negative pole tab, can with the fixture's flow respectively to positive pole tab and negative pole tab are welded. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in detail below according to the drawings and embodiment.

[0022] Figure 1 Structure diagram of ultrasonic welding tab protection mechanism of one of the structures for the embodiment of the utility model Figure One ;

[0023] Figure 2 Structure diagram of ultrasonic welding tab protection mechanism of one of the structures for the embodiment of the utility model Figure Two ;

[0024] Figure 3 Structure diagram of ultrasonic welding tab protection mechanism of another structure for the embodiment of the utility model Figure One ;

[0025] Figure 4 Structure diagram of ultrasonic welding tab protection mechanism of another structure for the embodiment of the utility model Figure Two .

[0026] In the drawing:

[0027] 10, abutting and pressing part, 11, avoiding hole, 12, avoiding groove, 13, notch, 101, first side, 102, second side, 20, connecting part, 21, connecting hole, 30, side surface protection part. DETAILED DESCRIPTION

[0028] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model embodiment will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the embodiment, if the terms "up", "down", "left", "right" and other orientation or position relationship appear, they are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second" and the like appear, they are only used to distinguish in description, and do not have special meanings.

[0032] As Figures 1 to 4As shown, the ultrasonic welding tab protection mechanism of the embodiment includes a pressing part 10 and a connecting part 20, the thickness of the pressing part 10 extends along the Z direction, and the pressing part 10 is provided with a clearance hole 11 along the Z direction; the connecting part 20 is fixedly connected with the edge of the pressing part 10, the connecting part 20 is used for driving connection with the driving part (not shown in the figure) of the ultrasonic welding device, the driving part can drive the connecting part 20 to drive the pressing part 10 to move along the Z direction, so that the pressing part 10 abuts against one side surface of the tab along the Z direction, and the welding area of the tab is exposed to the clearance hole 11.

[0033] The existing ultrasonic welding device includes a welding head, a pressing plate and a driving part (conventional technology, not shown in the figure), the pressing plate is drivingly connected with the output end of the driving part, and the driving part drives the pressing plate to move downward to press on the surface of the battery cell placed on the corresponding jig, so as to prevent the battery cell from moving during the welding of the tab to affect the welding effect of the tab and the adapter piece.

[0034] Optionally, the driving part is selected from any one of a motor, an air cylinder or an oil cylinder, and linear driving can be achieved.

[0035] The battery cell in the embodiment is a square battery cell.

[0036] It can be understood that the pressing part 10 in the embodiment is connected with the driving part of the ultrasonic welding device through the connecting part 20, when the battery cell, the tab and the adapter piece are all placed, the driving part of the ultrasonic welding device drives the pressing plate to press the battery cell downward, and the driving part synchronously drives the connecting part 20 to drive the pressing plate to press the tab downward, and then the welding head passes through the clearance hole 11 to weld the welding area of the tab. Since the tab is pressed by the pressing part 10, tearing, warping or wrinkling of the tab during ultrasonic welding can be avoided, so as to achieve the purpose of reducing the product NG rate and improving the good product rate at low cost and high efficiency.

[0037] Further, the length of the pressing part 10 extends along the X direction, the number of the clearance holes 11 is two, the two clearance holes 11 are distributed at intervals along the X direction, the clearance hole 11 is adjacent to the edge of the pressing part 10 close to the battery cell connected with the tab, and the X direction is perpendicular to the Z direction.

[0038] The number of the clearance holes 11 is designed to be two in the embodiment aiming at the number of welding marks when the tab is connected with the adapter piece, so that the part between the two welding marks is also pressed by the pressing part 10, and compared with opening one relatively larger clearance hole 11, the pressing effect on the tab is better, and the product yield can be further improved.

[0039] Before ultrasonic welding, the adapter piece and the battery cell are placed on the corresponding jigs in sequence, wherein the tab is above the adapter piece. In view of the position of the adapter piece, the avoiding groove 12 is formed on the side of the pressing part 10 along the Z direction towards the tab. The avoiding groove 12 is open on the side of the pressing part 10 along the Y direction away from the battery cell and on the side along the Z direction towards the tab. The avoiding groove 12 corresponds to the position of the adapter piece below the tab. The X direction, the Y direction and the Z direction are perpendicular to each other. Since the adapter piece has a certain thickness, the non-avoiding groove 12 area of the side of the pressing part 10 along the Z direction towards the tab is in close contact (surface-to-surface contact) with the tab, and the groove bottom (the side along the Z direction towards the tab) of the avoiding groove 12 is in close contact (surface-to-surface contact) with the upper surface of the tab above the adapter piece, so that the pressing part 10 can compact the tab and improve the stability of the pressing part 10 in abutting against the tab.

[0040] Exemplarily, the number of the avoiding grooves 12 is two, and the two avoiding grooves 12 are respectively communicated with one of the avoiding holes 11.

[0041] Further, the ultrasonic welding tab protection mechanism of the embodiment further comprises a side protection part 30. The side protection part 30 is fixed on the side of the pressing part 10 along the Y direction adjacent to the battery cell, and the side protection part 30 is protruded on the side of the pressing part 10 along the Z direction away from the tab. The X direction, the Y direction and the Z direction are perpendicular to each other.

[0042] Dust will be generated during ultrasonic welding, and the welding area of the tab is very close to the side of the battery cell. Therefore, the dust generated during ultrasonic welding will splash onto the battery cell, thereby polluting the side of the battery cell. The side protection part 30 of the embodiment is arranged on the side of the pressing part 10 along the Y direction adjacent to the battery cell, which can prevent the welding dust from falling on the side of the battery cell and polluting the battery cell.

[0043] Further, the two sides of the side protection part 30 along the X direction exceed the avoiding hole 11 and are adjacent to the two sides of the battery cell along the X direction. The structure design can physically isolate the welding area of the battery cell and the tab during ultrasonic welding, so as to further improve the anti-pollution effect of the battery cell.

[0044] Exemplarily, as shown in Figure 1 and Figure 2 , the pressing part 10 has a first side 101 and a second side 102 along the Y direction (width direction). The side protection part 30 is arranged on the first side 101, and the avoiding groove 12 is arranged adjacent to the second side 102. The structure is suitable for the case that the battery cell is adjacent to the first side 101; as shown in Figure 3 and Figure 4As shown, for the structure that the side protection part 30 is arranged at the second side 102 and the avoiding groove 12 is arranged adjacent to the first side 101, the ultrasonic welding tab protection mechanism is applicable to the case that the battery cell is adjacent to the second side 102, and the ultrasonic welding tab protection mechanisms of the two structures are mirror-symmetrical.

[0045] In the same ultrasonic welding device, the ultrasonic welding tab protection mechanisms of the two structures can be installed simultaneously, one of which is applicable to the auxiliary welding of the positive electrode tab and the other of which is applicable to the auxiliary welding of the negative electrode tab. When the positive electrode tab welding is completed, the jig flows to the negative electrode tab welding station to perform the welding of the negative electrode tab, and the specific process is not described herein.

[0046] In the embodiment, one end of the pressing part 10 along the X direction is connected perpendicularly to the connecting part 20 to avoid the influence of the connecting part 20 on the welding head moving downward to the position of the avoiding hole 11 to weld the tab.

[0047] Further, the thickness of the connecting part 20 extends along the X direction, and at least two connecting holes 21 are arranged through the thickness direction of the connecting part 20, and the two connecting holes 21 are connected to the output end of the driving part through bolts, respectively.

[0048] The at least two bolts are connected to the driving part of the ultrasonic welding device to improve the installation stability of the ultrasonic welding tab protection mechanism. Meanwhile, the bolts are connected conveniently.

[0049] Further, the two connecting holes 21 are arranged spaced apart along the Y direction, the connecting hole 21 is a long hole structure, the length of the connecting hole 21 extends along the Z direction, and the X direction is perpendicular to the Z direction. The bolt can move along the length direction of the connecting hole 21 to adjust the position of the pressing part 10 along the Z direction, so that the pressing plate connected to the driving part can press the surface of the battery cell and the pressing part 10 can press the tab at the same time.

[0050] In the embodiment, the pressing part 10 is provided with a notch 13 adjacent to the connecting part 20, and the notch 13 is located on the side of the pressing part 10 facing the tab, which can avoid the protruding part of the jig below the pressing part 10, so that the pressing part 10 can compact the tab to improve the welding effect.

[0051] In the embodiment, the pressing part 10, the connecting part 20 and the side protection part 30 are integrally formed, and the structure is stable.

[0052] The embodiment also provides an ultrasonic welding device, which comprises a driving part, a pressing plate and the ultrasonic welding tab protection mechanism of any one of the above embodiments. The output end of the driving part is in transmission connection with the pressing plate and the connecting part 20 of the ultrasonic welding tab protection mechanism. The tab is connected with a battery cell, and the driving part can synchronously drive the pressing plate and the pressing part 10 to move along the Z direction synchronously, so that the pressing plate presses the battery cell and the pressing part 10 presses the tab.

[0053] The embodiment increases the ultrasonic welding tab protection mechanism on the basis of the original ultrasonic welding device, and designs two kinds of mirror-symmetrical ultrasonic welding tab protection mechanisms for the positive and negative tab, which can weld the positive and negative tab respectively with the rotation of the jig.

[0054] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ultrasonic welding tab protection mechanism, characterized by, The application relates to an ultrasonic welding tab protection mechanism. The thickness of the pressing part extends along the Z direction, and the pressing part is provided with an avoiding hole along the Z direction; The connecting part is fixedly connected with the edge of the pressing part, the connecting part is used for transmission connection with a driving part of an ultrasonic welding device, the driving part can drive the connecting part to move the pressing part along the Z direction, so that the pressing part abuts against one side of the tab along the Z direction, and a welding area of the tab is exposed to the avoiding hole.

2. The ultrasonic tab tip protection mechanism of claim 1, wherein, The length of the pressing part extends along the X direction, the number of the avoiding holes is two, the two avoiding holes are spaced apart along the X direction, the avoiding holes are adjacent to the edge of the battery cell connected with the tab, and the X direction is perpendicular to the Z direction.

3. The ultrasonic tab tip protection mechanism of claim 2, wherein, The avoiding groove is located on the side of the pressing part away from the battery cell along the Y direction and the side of the pressing part facing the tab along the Z direction, and the avoiding groove is open on both sides.

4. The ultrasonic tab tip protection mechanism of claim 2, wherein, The side protection part is fixed on the side of the pressing part adjacent to the battery cell along the Y direction, and the side protection part is protruded on the side of the pressing part away from the tab along the Z direction.

5. The ultrasonic tab tip protection mechanism of claim 4, wherein, The two sides of the side protection part along the X direction exceed the avoiding holes and are adjacent to the two sides of the battery cell along the X direction.

6. The ultrasonic tab tip protection mechanism of any one of claims 2 to 5, wherein, One end of the pressing part along the X direction is perpendicularly connected with the connecting part.

7. The ultrasonic tab tip protection mechanism of claim 6, wherein, The thickness of the connecting part extends along the X direction, and the connecting part is provided with at least two connecting holes along the thickness direction of the connecting part.

8. The ultrasonic tab tip protection mechanism of claim 7, wherein, The two connecting holes are spaced apart along the Y direction, the connecting holes are long hole structures, the length of the connecting holes extends along the Z direction, and the X direction, the Y direction and the Z direction are perpendicular to each other.

9. The ultrasonic tab tip protection mechanism of claim 6, wherein, The pressing part is provided with a notch adjacent to the connecting part, and the notch is located on the side of the pressing part facing the tab.

10. An ultrasonic welding device characterized by comprising: The application relates to an ultrasonic welding tab protection mechanism. The output end of the driving part is transmissionally connected with the pressing plate and the connecting part of the ultrasonic welding tab protection mechanism, the tab is connected with a battery cell, and the driving part can synchronously drive the pressing plate and the pressing part to move along the Z direction, so that the pressing plate presses the battery cell and the pressing part presses the tab.

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