CN214291370U - Protective cover plate and ultrasonic welding equipment - Google Patents

Abstract

The utility model relates to a protection cover plate and ultrasonic welding equipment, wherein, the protection cover plate comprises an installation part and a working part, the installation part is used for being connected with a welding fixture of the ultrasonic welding equipment, and the working part is used for being arranged above a lug of an electric core; the lower surface of the working part is provided with an accommodating groove which is used for accommodating the protection sheet; the lower surface of work portion is less than the lower surface of installation department to form first step at the lower surface of protection apron, first step is used for providing dodging the space for the protection sheet that moves down when ultrasonic bonding. The utility model discloses a protection cover plate and ultrasonic welding equipment sets up first step through the lower surface at protection cover plate, and when ultrasonic welding, the soldered connection butt screening glass is and push down the utmost point ear of screening glass and electric core, and first step can provide for the screening glass that moves down and dodge the space, avoids taking place the friction and producing the piece between the upper surface of screening glass and the lower surface of protection cover plate work portion, and then avoids the short circuit problem that the piece causes.

Description

Protective cover plate and ultrasonic welding equipment

Technical Field

The application relates to the technical field of lithium battery ultrasonic welding equipment, in particular to a protective cover plate and ultrasonic welding equipment.

Background

At present, the safety requirement of an electric automobile on a lithium battery is higher and higher, and the lithium battery assembling process plays a vital role in the performance of the battery. In the assembly process of the lithium battery, the pole lug of the battery cell and the adapter sheet need to be welded together, and an ultrasonic welding mode is mainly adopted during welding. When the welding, in order to avoid soldered connection direct contact electric core utmost point ear and weld utmost point ear and split, generally can set up the protection cover plate in the top of electric core utmost point ear, sets up the screening glass in the protection cover plate, and the screening glass setting is in the top of electric core utmost point ear, and soldered connection is direct and the screening glass contact when the welding to avoid soldered connection direct contact electric core utmost point ear and weld utmost point ear and split. However, in the ultrasonic welding process, the welding head abuts against the protective sheet and presses down the protective sheet and the tab of the battery cell, and after the protective sheet moves down and is separated from the protective cover plate, under the high-frequency vibration of the ultrasonic welding, friction is likely to occur between the upper surface of the protective sheet and the lower surface of the protective cover plate, so that metal or other material debris is generated, and further, a short-circuit problem is likely to be induced.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a protective cover plate and an ultrasonic welding apparatus to solve the above problems.

The utility model discloses a protective cover plate, including installation department and work portion, the installation department is used for being connected with the welding jig of ultrasonic welding equipment, the work portion is used for setting up above electric core utmost point ear; the lower surface of the working part is provided with an accommodating groove which is used for accommodating the protection sheet; the lower surface of work portion is less than the lower surface of installation department, with the lower surface of protection apron forms first step, first step is used for providing dodging the space for the screening sheet that moves down when ultrasonic bonding.

In one embodiment, the upper surface of the working part is further provided with a placing groove, the placing groove is positioned above an accommodating groove, and the placing groove and the accommodating groove are communicated with each other and penetrate through the working part in the thickness direction; the side wall of the placing groove is inclined to the upper surface or the lower surface of the working part, the opening size of one end, away from the accommodating groove, of the placing groove is larger than that of the accommodating groove, and the opening size of one end, close to the accommodating groove, of the placing groove is equal to that of the accommodating groove.

In one embodiment, the side wall of the receiving groove is perpendicular to the upper surface or the lower surface of the working part, and a gap is formed between the side wall of the receiving groove and the side wall of the protective sheet, and the side wall of the receiving groove is used for limiting the position of the protective sheet.

In one embodiment, the upper surface of the working part is lower than the upper surface of the mounting part, so that a second step is formed on the upper surface of the protective cover plate, and the second step is used for providing an avoiding space for a dust cover of the ultrasonic welding equipment.

In one embodiment, the protective cover plate further comprises a first magnetic part, the lower surface of the mounting part is provided with a mounting groove, and the first magnetic part is embedded in the mounting groove; the welding jig of ultrasonic welding equipment is provided with the second magnetism and inhales the piece, the piece is inhaled mutually with second magnetism to first magnetism, in order to incite somebody to action the protection apron is installed on the welding jig.

In one embodiment, the mounting portion is further provided with a first limiting member, the welding fixture of the ultrasonic welding device is further provided with a second limiting member, and the first limiting member is used for being matched with the second limiting member to further limit the mounting position of the protective cover plate.

In one embodiment, the first limiting member is a limiting hole or a limiting groove, the limiting hole or the limiting groove is formed in the lower surface of the protective cover plate mounting portion, the second limiting member is a limiting post, and the limiting post is arranged on the upper surface of a welding fixture of the ultrasonic welding device and extends upwards; the limiting column can penetrate through the limiting hole or the limiting groove, and therefore the installation position of the protective cover plate is limited.

In one embodiment, the first limiting member is a limiting post, the limiting post is disposed on the lower surface of the protective cover plate mounting portion and extends downward, the second limiting member is a limiting hole or a limiting groove, and the limiting hole or the limiting groove is opened on the upper surface of a welding fixture of the ultrasonic welding device; the limiting column can penetrate through the limiting hole or the limiting groove, and therefore the installation position of the protective cover plate is limited.

The utility model also provides an ultrasonic welding equipment, arbitrary including workstation, soldered connection, welding jig and higher authority the protection apron, the workstation is used for bearing electric core, electric core includes top cap, utmost point ear and switching piece, the one end setting of switching piece is in the below of utmost point ear, the other end with the top cap is connected, the soldered connection be used for with screening glass, utmost point ear and switching piece welding are in the same place in proper order.

In one embodiment, the ultrasonic welding device further comprises a limiting block, wherein the limiting block is arranged on the workbench and used for limiting the position of the battery cell on the workbench.

The utility model discloses a protection apron and ultrasonic bonding equipment, its beneficial effect is:

the utility model discloses a protection cover plate and ultrasonic bonding equipment, through the reasonable structure that sets up protection cover plate, will protect the lower surface design of apron working portion for being less than the lower surface of installation department to lower surface at protection cover plate forms first step. The arrangement of the first step can prevent the working part of the protective cover plate from excessively extruding the lug of the battery cell and prevent the lug from being cracked; on the other hand, at ultrasonic bonding's in-process, the soldered connection butt screening glass and push down the utmost point ear of screening glass and electric core, the screening glass moves down and break away from behind the protection apron, and first step can provide the space of dodging for the screening glass that moves down for the upper surface of screening glass keeps away from the lower surface of protection apron working part as far as possible, avoids taking place the friction between the upper surface of screening glass and the lower surface of protection apron working part when ultrasonic bonding and produces metal or other material piece, and then avoids the short circuit problem that the piece causes.

Drawings

Fig. 1 is a schematic perspective view of an upper surface viewing angle of a protective cover according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a bottom surface view of a protective cover according to an embodiment of the present invention.

Fig. 3 is a schematic longitudinal cross-sectional view of a protective cover according to an embodiment of the present invention.

Fig. 4 is a schematic top view of a protective cover according to an embodiment of the present invention.

Fig. 5 is a schematic bottom view of a protective cover according to an embodiment of the present invention.

Fig. 6 is a schematic top view of an ultrasonic welding apparatus according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of the protection cover plate before welding and when the protection cover plate is disposed above the battery cell tab according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of the tab of the protection cover plate and the battery cell before welding when moving to the welding position according to an embodiment of the present invention.

Fig. 9 is a schematic structural view of the tab of the protection cover plate and the battery cell when the tab is welded at the welding position according to an embodiment of the present invention.

Reference numerals:

the ultrasonic welding device comprises an ultrasonic welding device 10, a workbench 11, a welding head 12, a welding clamp 13, a first limiting block 14 and a second limiting block 15; the battery comprises a protective cover plate 100, a mounting part 110, a first magnetic part 111, a mounting groove 112, a limiting hole 114, a working part 120, a placing groove 121, a receiving groove 122, a gap 123, a first step 124, a second step 125, a battery cell 200, a top cover 210, a tab 220, a positive tab 221, a negative tab 222 and an adapter plate 230; the protective sheet 300.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The application provides a protection cover plate and ultrasonic welding equipment, wherein, ultrasonic welding equipment includes workstation, soldered connection, welding jig and protection cover plate, and the workstation is used for bearing electric core, and electric core includes top cap, utmost point ear and switching piece, and the one end setting of switching piece is in the below of utmost point ear, and the other end is connected with the top cap. The welding fixture is used for fixedly arranging the protective cover plate above the battery core lug. The holding tank has been seted up in the protection cover plate, and the holding tank is used for holding the screening glass, and the screening glass is used for setting up the top of electric core utmost point ear, avoids welding head lug direct weld utmost point ear and welds the utmost point ear and split. During welding, the welding head directly acts on the protection sheet, and the protection sheet, the electrode lug and the adapter sheet are sequentially welded together.

In one embodiment, the structure of the protective cover 100 is as shown in fig. 1 to 5, wherein fig. 1 is a schematic perspective view of an upper surface of the protective cover 100, fig. 2 is a schematic perspective view of a lower surface of the protective cover 100, fig. 3 is a cross-sectional view of the protective cover 100, fig. 4 is a schematic top view of the protective cover 100, and fig. 5 is a schematic bottom view of the protective cover 100. As shown in fig. 1 to 5, the protective cover 100 includes a mounting portion 110 and a working portion 120. The working portion 120 is opened with a placement groove 121 and an accommodation groove 122, the placement groove 121 is located above the accommodation groove 122, and the placement groove 121 and the accommodation groove 122 communicate with each other and penetrate the working portion 120 in the thickness direction. The side walls of the placement groove 121 are inclined to the upper surface and the lower surface of the working portion 120, the opening dimension of the placement groove 121 away from one end of the accommodation groove 122 is larger than the opening dimension of the accommodation groove 122, the opening dimension of the placement groove 121 close to one end of the accommodation groove 122 is equal to the opening dimension of the accommodation groove 122, the placement groove 121 is used for facilitating the placement of the protection sheet 300 into the accommodation groove 122, and the accommodation groove 122 is used for accommodating the protection sheet 300.

In one embodiment, a top view structure of the ultrasonic welding apparatus 10 is shown in fig. 6, and includes a workbench 11, a welding head (not shown in fig. 6), a welding fixture 13, a protective cover plate 100, and a limiting block, wherein the battery cell 200 is placed on the workbench 11, and the battery cell 200 includes a top cover 210, a tab 220, and an adaptor sheet (not shown in fig. 6). The tabs 220 of the battery cell 200 include a positive tab 221 and a negative tab 222, the positive tab 221 is located on the left side of the battery cell 200, the negative tab 222 is located on the right side of the battery cell 200, and the positive tab 221 and the negative tab 222 respectively correspond to an adaptor sheet, a welding fixture 13 and a protective cover plate 100. One end of the adapter sheet is arranged below the tab 220, the other end of the adapter sheet is connected with the top cover 210, the mounting portion 110 of the protective cover plate 100 is connected with the welding fixture 13, and the working portion 120 of the protective cover plate 100 is located above the tab 220 of the battery cell 200. The top cover 210 of the battery cell 200 is located above the battery cell 200, the limiting blocks include a first limiting block 14 and a second limiting block 15, the first limiting block 14 abuts against the top cover 210 of the battery cell 200, and the second limiting block 15 abuts against the bottom surface of the battery cell 200, so as to limit the position of the battery cell 200 on the workbench 11.

As shown in fig. 7, when the protective cover plate 100 is disposed over the tab 220 of the battery cell 200, the protective sheet 300 is received in the receiving groove 122 and is positioned over the electrode tab 220. The lower surface of the working portion 120 of the protective cover plate 100 is lower than the lower surface of the mounting portion 110, so as to form a first step 124 on the lower surface of the protective cover plate 100, and the arrangement of the first step 124 can avoid the working portion 120 of the protective cover plate 100 from excessively extruding the tab 220 of the battery cell 200, and avoid the tab 220 from being cracked. In addition, as shown in fig. 7, before welding, the protective sheet 300 is located in the receiving groove 122 of the protective cover plate 100 and above the tab 220 of the battery cell 200, the adaptor sheet 230 is disposed below the tab 220, the tab 220 of the battery cell 200 is formed by stacking multiple layers of aluminum foils or multiple layers of copper foils, a large gap exists between the aluminum foils or between the copper foils, and the thickness of the tab 220 is thick.

In one embodiment, the ultrasonic welding apparatus 10 further includes a first driving member and a second driving member (not shown in the figure), the first driving member is used for driving the workbench 11 to move, and the welding fixture 13, the protective cover plate 100 and the battery cell 200 move together with the workbench 11 to the welding position. In the moving process, the protection sheet 300 is located in the receiving groove 122 of the protection cover plate 100, and the side wall of the receiving groove 122 limits the protection sheet 300, so as to prevent the protection sheet 300 from flying, sliding and the like in the moving process.

In the welding position, as shown in fig. 8, the working portion 120 of the protective cover plate 100, the protective sheet 300 in the protective cover plate 100 receiving groove 122, the table 11, the adaptor sheet 230 above the table, and the tab 220 of the battery cell 200 are all located below the welding head 12. Then, as shown in fig. 9, the welding head 12 is moved downward by the driving action of the second driving member, the welding head 12 abuts the protective sheet 300 and presses down the protective sheet 300 and the tab 220 of the battery cell 200. The protective sheet 300 moves downward under the pressure of the bonding head 12 and is separated from the receiving groove 122 of the protective cover sheet 100; under the pressure action of the welding head 12, gaps between the copper foils or the aluminum foils stacked on each other are gradually reduced, and the thickness of the tab 220 is gradually reduced until the tab 220 is compacted. Then, the welding head 12 welds the protective sheet 300, the tab 220, and the interposer 230 together in sequence.

It will be appreciated that the tab 220 is reduced in thickness by a dimension equal to the distance the protective sheet 300 moves downward under the pressure of the welding head 12. Because the size that utmost point ear 220 thickness reduces is limited, consequently, through set up first step 124 at the lower surface of protection apron 100, first step 124 can provide the space of dodging for the protection sheet 300 that moves down when ultrasonic bonding, avoids producing the friction between the upper surface of protection sheet 300 and the lower surface of protection apron 100 work portion 120 when ultrasonic bonding, avoids producing metal or other material piece, and then avoids the short circuit problem that the piece arouses.

In one embodiment, as shown in fig. 3, the side walls of the receiving groove 122 are perpendicular to the upper surface or the lower surface of the working portion 120, so that the receiving groove 122 can limit the protection sheet 300, and the protection sheet 300 can be prevented from flying, sliding, and the like during moving along with the working platform 11. In addition, as shown in fig. 7, after the protection sheet 300 is disposed in the receiving groove 122, there is a gap 123 between the side wall of the receiving groove 122 and the side wall of the protection sheet 300, so that when the soldering head 12 presses down the protection sheet 300, the protection sheet 300 can be easily separated from the receiving groove 122, and metal chips or other material chips generated by friction between the side wall of the protection sheet 300 and the side wall of the receiving groove 122 are avoided, thereby avoiding the short circuit problem caused by the chips.

In the above embodiment, the working portion 120 of the protective cover 100 is provided with the placement groove 121, and the protective sheet 300 is placed in the accommodation groove 122 through the placement groove 121. It is understood that, in other embodiments, the upper surface of the working portion 120 of the protective cover plate 100 may be provided with only a through groove for the welding head 12 to pass through instead of the placement groove 121, and the through groove and the receiving groove 122 are communicated with each other and pass through the working portion 120 in the thickness direction. In the above embodiment, the size of the through groove is not limited as long as the bonding head 12 can freely move up and down in the through groove. If the size of the opening of the through-groove is smaller than the size of the protective sheet 300, the protective sheet 300 needs to be disposed in the receiving groove 122 before the protective cap plate 100 is fixedly disposed over the battery cell 200.

In addition, in one embodiment, as shown in fig. 1 and 3, the upper surface of the working portion 120 of the protective cover 100 is lower than the upper surface of the mounting portion 110 to form a second step 125 on the upper surface of the protective cover 100, and the second step 125 is used to provide an escape space for the dust cover of the ultrasonic welding apparatus 10.

In one embodiment, as shown in fig. 2 and 4, the protective cover plate 100 further includes a first magnetic member 111, a mounting groove 112 is formed on a lower surface of the mounting portion 110, and the first magnetic member 111 is inserted into the mounting groove 112; the welding fixture 13 of the ultrasonic welding apparatus 10 is provided with a second magnetic attraction member, and the first magnetic attraction member 111 and the second magnetic attraction member attract each other magnetically, so as to install the protective cover plate 100 on the welding fixture 13. In a specific embodiment, at least a portion of the first magnetic member 111 and the second magnetic member is a magnet; or, at least part of the first magnetic part 111 is a magnet, and at least part of the second magnetic part contains components such as iron, cobalt, nickel, etc. capable of being attracted by the magnet; alternatively, at least a part of the first magnetic member 111 comprises iron, cobalt, nickel, etc. capable of being attracted by a magnet, and at least a part of the second magnetic member is a magnet.

In one embodiment, as shown in fig. 1 and fig. 2, a first limiting member is further disposed on the mounting portion 110 of the protective cover plate 100, and a second limiting member is further disposed on the welding fixture 13 of the ultrasonic welding apparatus 10, wherein the first limiting member is configured to cooperate with the second limiting member to limit the mounting position of the protective cover plate 100, so as to prevent the protective cover plate 100 from deflecting relative to the welding fixture 13. In addition, specifically in the embodiment shown in fig. 1 and 2, the first limiting member is a limiting hole 114, the limiting hole 114 is opened in the mounting portion 110 of the protective cover plate 100, the second limiting member is a limiting post, which may be a limiting pin or a limiting screw, and the limiting post is disposed on the upper surface of the welding fixture 13 and extends upward; when the protection cover plate 100 is magnetically connected with the welding fixture 13, the limiting posts on the welding fixture 13 can penetrate through the limiting holes 114, so as to limit the installation position of the protection cover plate 100 and prevent the protection cover plate 100 from deflecting relative to the welding fixture 13.

In the embodiment shown in fig. 1 and 2, the first limiting member is a limiting hole 114, and the limiting hole 114 penetrates through the mounting portion 110 of the protective cover 100 in the thickness direction. It is understood that, in other embodiments, the limiting hole 114 may be replaced by a limiting groove, that is, a limiting groove may be formed on the lower surface of the mounting portion 110 of the protective cover plate 100, when the protective cover plate 100 is magnetically connected with the welding fixture 13, the limiting post on the welding fixture 13 can penetrate through the limiting groove, so as to limit the mounting position of the protective cover plate 100, and prevent the protective cover plate 100 from deflecting relative to the welding fixture 13.

In another specific embodiment, the first limiting member may be a limiting post, the limiting post is disposed on the lower surface of the mounting portion 110 of the protective cover plate 100 and extends downward, the second limiting member is a limiting hole 114 or a limiting groove, and the limiting hole 114 or the limiting groove is opened on the upper surface of the welding fixture 13; when the protection cover plate 100 is magnetically connected with the welding fixture 13, the limiting posts on the lower surface of the protection cover plate 100 can penetrate through the limiting grooves or the limiting holes 114 on the welding fixture 13, so as to limit the installation position of the protection cover plate 100 and prevent the protection cover plate 100 from deflecting relative to the welding fixture 13.

The protective cover plate 100 and the ultrasonic welding apparatus 10 of the present application design the lower surface of the working portion 120 of the protective cover plate 100 to be lower than the lower surface of the mounting portion 110 by reasonably setting the structure of the protective cover plate 100, thereby forming the first step 124 on the lower surface of the protective cover plate 100. The arrangement of the first step 124 can prevent the working part 120 of the protective cover plate 100 from excessively pressing the tab 220 of the battery cell 200, and prevent the tab 220 from being cracked; on the other hand, in the process of ultrasonic welding, the welding head 12 abuts against the protection sheet 300 and presses down the tab 220 of the protection sheet 300 and the battery cell 200, and after the protection sheet 300 moves downward and is separated from the protection cover plate 100, the first step 124 can provide an avoiding space for the protection sheet 300 moving downward, so that the upper surface of the protection sheet 300 is far away from the lower surface of the working part 120 of the protection cover plate 100 as far as possible, and the generation of metal or other material debris due to friction between the upper surface of the protection sheet 300 and the lower surface of the working part 120 of the protection cover plate 100 during ultrasonic welding is avoided, and the short circuit problem caused by the debris is further avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The protective cover plate is characterized by comprising an installation part and a working part, wherein the installation part is used for being connected with a welding clamp of ultrasonic welding equipment, and the working part is used for being arranged above a lug of an electric core; the lower surface of the working part is provided with an accommodating groove which is used for accommodating the protection sheet; the lower surface of work portion is less than the lower surface of installation department, with the lower surface of protection apron forms first step, first step is used for providing dodging the space for the screening sheet that moves down when ultrasonic bonding.

2. The protective cover according to claim 1, wherein the upper surface of the working portion is further provided with a placement groove, the placement groove is positioned above an accommodation groove, and the placement groove and the accommodation groove are communicated with each other and penetrate through the working portion in the thickness direction; the side wall of the placing groove is inclined to the upper surface or the lower surface of the working part, the opening size of one end, away from the accommodating groove, of the placing groove is larger than that of the accommodating groove, and the opening size of one end, close to the accommodating groove, of the placing groove is equal to that of the accommodating groove.

3. The protective cover sheet according to claim 1, wherein a side wall of the receiving groove is perpendicular to an upper surface or a lower surface of the working part, and a gap is present between the side wall of the receiving groove and the side wall of the protective sheet, the side wall of the receiving groove serving to restrict a position of the protective sheet.

4. The protective cover plate according to claim 1, wherein an upper surface of the working portion is lower than an upper surface of the mounting portion to form a second step on the upper surface of the protective cover plate, the second step being used to provide an escape space for a dust cover of the ultrasonic welding apparatus.

5. The protective cover plate according to any one of claims 1 to 4, further comprising a first magnetic member, wherein a mounting groove is formed on a lower surface of the mounting portion, and the first magnetic member is embedded in the mounting groove; the welding jig of ultrasonic welding equipment is provided with the second magnetism and inhales the piece, the piece is inhaled mutually with second magnetism to first magnetism, in order to incite somebody to action the protection apron is installed on the welding jig.

6. The protective cover plate according to claim 5, wherein a first limiting member is further disposed on the mounting portion, a second limiting member is further disposed on a welding fixture of the ultrasonic welding apparatus, and the first limiting member is used for being matched with the second limiting member to further limit a mounting position of the protective cover plate.

7. The protective cover plate according to claim 6, wherein the first limiting member is a limiting hole or a limiting groove, the limiting hole or the limiting groove is formed in the lower surface of the protective cover plate mounting portion, the second limiting member is a limiting post, and the limiting post is disposed on the upper surface of the welding jig of the ultrasonic welding apparatus and extends upward; the limiting column can penetrate through the limiting hole or the limiting groove, and therefore the installation position of the protective cover plate is limited.

8. The protective cover plate according to claim 6, wherein the first limiting member is a limiting post which is disposed on a lower surface of the protective cover plate mounting portion and extends downward, and the second limiting member is a limiting hole or a limiting groove which is opened on an upper surface of a welding jig of the ultrasonic welding apparatus; the limiting column can penetrate through the limiting hole or the limiting groove, and therefore the installation position of the protective cover plate is limited.

9. The ultrasonic welding equipment is characterized by comprising a workbench, a welding head, a welding clamp and the protective cover plate according to any one of claims 1 to 8, wherein the workbench is used for bearing an electric core, the electric core comprises a top cover, a pole lug and a switching piece, one end of the switching piece is arranged below the pole lug, the other end of the switching piece is connected with the top cover, and the welding head is used for welding the protective plate, the pole lug and the switching piece together in sequence.

10. The ultrasonic welding apparatus of claim 9, further comprising a limiting block disposed on the worktable for limiting a position of the battery cell on the worktable.

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