Ultrasonic roll welding device for battery tabs and battery

Abstract

The utility model relates to an ultrasonic roll welding device for a battery tab and a battery. The ultrasonic roll welding device is characterized by comprising a roll welding machine main body, a driving roll welding wheel, a driven roll welding wheel, a conveying mechanism and a guide mechanism, the driving roll welding wheel and the driven roll welding wheel are assembled at one end of the roll welding machine body side by side in the first direction, and the roll welding machine body can drive the driving roll welding wheel to rotate. The conveying mechanism is used for placing pole cores of a battery and can sequentially convey a plurality of pole cores in a second direction to enable tabs of the pole cores to reach set positions, the guide mechanism is fixed to one side of the driving roll welding wheel and one side of the driven roll welding wheel in the second direction, and the second direction is perpendicular to the first direction; and under the condition that the conveying mechanism conveys the tab to a set position, the guide mechanism can guide the tab to the position between the driving roll welding wheel and the driven roll welding wheel, so that the driving roll welding wheel welds the tab. According to the roll welding device, the tabs with wide welding marks can be welded at a time, and the production efficiency and the welding quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, and more specifically, to an ultrasonic rolling welding device for a battery tab and a battery. Background Art

[0002] In some battery production processes, the connection between the tab and the cover plate pole connecting piece, such as blade batteries, usually requires ultrasonic pre-welding of multi-layer tabs during the production process to facilitate subsequent laser welding with the tab cover. As battery capacity increases, the width of the tab is also increasing. For tabs with a larger pre-weld width, ultrasonic pre-welding must be performed more than twice, which seriously affects production efficiency and product quality. Utility Model Content

[0003] One object of the utility model is to provide an ultrasonic rolling welding device for a battery tab, so as to at least solve one of the problems of the background technology.

[0004] According to a first aspect of the utility model, there is provided an ultrasonic roll welding device for a battery tab, comprising: a roll welding machine body, an active roll welding wheel, a driven roll welding wheel, a transmission mechanism and a guide mechanism;

[0005] The active roll welding wheel and the driven roll welding wheel are assembled in parallel at one end of the roll welding machine body along a first direction, and the roll welding machine body can drive the active roll welding wheel to rotate;

[0006] The conveying mechanism is used to place the pole cores of the battery, and can sequentially convey the plurality of pole cores along the second direction so that the pole ears of the pole cores are at the set positions, and the guide mechanism is fixed to one side of the active roll welding wheel and the driven roll welding wheel along the second direction, and the second direction is perpendicular to the first direction;

[0007] When the conveying mechanism conveys the pole tab to the set position, the guiding mechanism can guide the pole tab to between the active welding roll wheel and the driven welding roll wheel, so that the active welding roll wheel welds the pole core.

[0008] Optionally, the conveying mechanism includes a driving member, a conveyor belt and a positioning structure, the driving member can drive the conveyor belt to move along the second direction, and the positioning structure can fix the pole lug on the conveyor belt.

[0009] Optionally, the guide mechanism comprises an upper guide plate and a lower guide plate;

[0010] The upper guide plate and the lower guide plate are close to each other along the second direction to form a trumpet shape, the opening side of the trumpet shape faces the set position, and the closing side of the trumpet shape extends between the active roll welding wheel and the driven roll welding wheel.

[0011] Optionally, the upper guide plate and the lower guide plate are both bent plates convex toward each other, the upper guide plate and the lower guide plate are parallel to each other on the closing side, and the distance between them is less than the thickness of the pole ear, so as to press the pole ear.

[0012] Optionally, the distance between the guide mechanism and the center line of the active roll welding wheel along the second direction is 1-5 mm.

[0013] Optionally, it also includes a first shaping mechanism and a second shaping mechanism, which are sequentially arranged on the other side of the seam welding machine body, and a tower-shaped area is formed at the outer end of the pole ear after welding. The first shaping mechanism is used to arrange the tower-shaped area so that the second shaping mechanism can cut off the tower-shaped area.

[0014] Optionally, it further includes a frame, and the seam welding machine body, the guide mechanism, the first shaping mechanism and the second shaping mechanism are respectively fixed on the frame.

[0015] According to a second aspect of the present invention, a battery is provided, comprising a pole core and a plurality of layers of pole tabs located at one end of the pole core, wherein the plurality of layers of the pole tabs are welded together by the ultrasonic rolling welding device described in the first aspect.

[0016] Optionally, a spacer is further included, and the spacer is used for clamping at the root of the pole lug.

[0017] Optionally, a distance between the spacer and the guide mechanism in a third direction is 0.1-1 mm, and the third direction is perpendicular to the first direction and the second direction.

[0018] One technical effect of the utility model is that the utility model enables the pole ear to be sequentially conveyed to the set position through the conveying mechanism, and guides the pole ear between the ultrasonic active rolling welding wheel and the driven rolling welding wheel through the guiding mechanism to realize the pre-welding of the pole ear. Since the welding mark width of the active rolling welding wheel is not restricted, the pole ear can complete the pre-welding process of the production process at one time, thereby improving the welding efficiency, reducing the number of welding times, avoiding the problem of welding defects, and improving product quality.

[0019] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0021] Figure 1The utility model provides an assembly method of an ultrasonic rolling welding device for a battery tab (with a tab placed thereon).

[0022] Figure 2 yes Figure 1 Exploded diagram.

[0023] Figure 3 yes Figure 1 main view.

[0024] Figure 4 yes Figure 1 Top view of the .

[0025] Figure 5 yes Figure 1 Schematic diagram from another perspective.

[0026] Figure 6 It is a schematic diagram of the distance between the guide mechanism provided by the utility model and the active rolling welding wheel along the second direction, and a schematic diagram of the distance between the spacer ring and the guide mechanism in the third direction.

[0027] Description of reference numerals:

[0028] 1. Seam welding machine body; 2. Active seam welding wheel; 3. Driven seam welding wheel; 4. Conveying mechanism; 41. Conveyor belt; 42. Positioning structure; 5. Guide mechanism; 51. Upper guide plate; 52. Lower guide plate; 6. Pole core; 61. Pole ear; 7. Spacer; 8. Second shaping mechanism; 81. Upper shaping plate, 82. Lower shaping plate; 83. Cutting knife; 9. Frame; 10. First shaping mechanism. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] like Figures 1 to 6 As shown, according to the first aspect of the utility model, an ultrasonic roll welding device for a battery pole tab 61 is provided, comprising: a roll welding machine body 1, an active roll welding wheel 2, a driven roll welding wheel 3, a transmission mechanism 4 and a guide mechanism 5; the active roll welding wheel 2 and the driven roll welding wheel 3 are arranged in parallel at one end of the roll welding machine body 1 along a first direction (X direction), and the roll welding machine body 1 can drive the active roll welding wheel 2 to rotate; the transmission mechanism 4 is used to place the pole core 6 of the battery, and can sequentially transmit a plurality of the pole cores 6 along a second direction (Y direction) so that the multi-layer pole tabs 61 on the pole core 6 are at a set position, and the guide mechanism 5 is fixed to one side of the active roll welding wheel 2 and the driven roll welding wheel 3 along the second direction, and the second direction is perpendicular to the first direction; when the transmission mechanism 4 transmits the pole tab 61 to the set position, the guide mechanism 5 can guide the pole tab 61 to between the active roll welding wheel 2 and the driven roll welding wheel 3, so that the active roll welding wheel 2 welds the pole tab 61.

[0035] Specifically, in the present application, by setting a conveying mechanism 4, the pole core 6 with the multi-layer pole tab 61 can be sequentially conveyed to the set position, that is, close to the welding position, and then when the pole core 6 is continued to be conveyed along the second direction, the multi-layer pole tab 61 can be smoothly moved into the welding position, that is, moved between the active roll welding wheel 2 and the driven roll welding wheel 3, so that the active roll welding wheel 2 can roll weld the pole tab 61 through cooperation with the driven roll welding wheel 3, so that the multi-layer pole tab 61 is welded into an integrated structure, so as to facilitate the subsequent welding connection of the pole tab 61 and the connecting piece of the cover plate pole column by laser welding. Among them, the active roll welding wheel and the driven roll welding wheel are arranged side by side along the first direction at one end of the roll welding machine body, which can be understood as the active roll welding wheel and the driven roll welding wheel are arranged in a symmetrical manner up and down.

[0036] In the above process, the setting of the transmission mechanism 4 ensures that the active roll welding wheel 2 can weld multiple tabs 61 with wider weld marks in sequence at one time, avoiding the problem of needing to weld them multiple times. On the one hand, it improves the production line efficiency, and on the other hand, it avoids the problem of welding defects that are prone to occur in multiple welding, especially the cracking and damage of the tabs 61 in the overlapping area of ​​the weld marks. In addition, due to the reduction in the number of welding times, it also avoids the problem of increasing the number of production line equipment sets in order to maintain the production line beat requirements, saving equipment costs. Among them, the ultrasonic roll welding device provided by the utility model can at least weld the tabs 61 with a weld mark width of more than 60 mm.

[0037] In the above embodiment, the active roll welding wheel 2 is the welding head mainly used for welding, and the driven welding wheel can provide certain support for the pole ear 61 during the welding process, and the rolling of the two roll welding wheels can be controlled by the roll welding machine body 1, so that the welding beat can match the conveying speed of the conveying mechanism 4. When the conveying mechanism conveys the pole core 6, since the pole ear 61 is usually located at one end of the pole core 6, when the pole core 6 is placed, the end with the pole ear 61 is directed toward the end with the roll welding device, so that the active roll welding wheel 2 can achieve the purpose of roll welding the multi-layer pole ear 61, that is, the conveying mechanism 4 can convey the pole core 6 so that the pole ear 61 is located at the set position.

[0038] Optionally, refer to Figures 1 to 5 The conveying mechanism 4 includes a driving member, a conveyor belt 41 and a positioning structure 42. The driving member can drive the conveyor belt 41 to move along the second direction, and the positioning structure 42 can fix the pole core 6 on the conveyor belt 41.

[0039] Specifically, in this embodiment, the conveying mechanism 4 can use a motor (i.e., a driving member, not shown in the figure) to drive the conveyor belt 41 to move at a constant speed to ensure the welding quality. The transmission method can be belt transmission or gear transmission, which is not limited by the present invention. In addition, during the transmission process, since the friction between the conveyor belt 41 and the pole core 6 is limited, and in order to improve the welding accuracy and the state consistency of the pole ear 61 during the welding process, a positioning structure 42 can be set on the conveyor belt 41.

[0040] In actual production, since the pole ear 61 is located at the end of the pole core 6, the pole ear 61 can be fixed by fixing the pole core 6 on the conveyor belt 41. The positioning structure 42 can be a positioning fixture or a groove structure matching the shape of the pole core 6, and the utility model does not limit this.

[0041] Optionally, refer to Figures 1 to 5 The guide mechanism 5 includes an upper guide plate 51 and a lower guide plate 52; the upper guide plate 51 and the lower guide plate 52 are close to each other along the second direction to form a trumpet shape, the opening side of the trumpet shape faces the set position, and the closing side of the trumpet shape extends between the active roll welding wheel 2 and the driven roll welding wheel 3.

[0042] Specifically, in this embodiment, the guide mechanism 5 is two guide plates. When the pole ear 61 is transferred to the set position and continues to move along the second direction, it can pass through the trumpet-shaped structure formed by the two guide plates in sequence. As the opening of the trumpet-shaped structure gradually decreases, the loose pole ear 61 can be gradually straightened and pressed, ensuring that the pole ear 61 can remain flat after entering the welding position (between the two rolling wheels), thereby improving the welding quality.

[0043] Optionally, refer to Figures 1 to 5 The upper guide plate 51 and the lower guide plate 52 are both bent plates convex toward each other. The upper guide plate 51 and the lower guide plate 52 are parallel to each other on the closing side, and the distance between them is less than the thickness of the pole ear 61, so as to press the pole ear 61.

[0044] Specifically, in this embodiment, the bent plate-shaped structures of the upper guide plate 51 and the lower guide plate 52 make it easier to straighten and flatten the loose pole tabs 61, further improving the flatness of the pole tabs 61 during welding.

[0045] Optionally, refer to Figure 6 The distance between the guide mechanism 5 and the center line of the active rolling welding wheel 2 along the second direction (reference Figure 6 The H) in the figure is 1 to 5 mm.

[0046] Specifically, in this embodiment, a certain distance is left between the guide mechanism 5 and the center line of the active rolling welding wheel 2 along the second direction, so as to ensure that the tab 61 transmitted from the guide mechanism 5 has good flatness and consistency and is not prone to loosening and delamination, and the preferred size of this distance is 1 to 5 mm.

[0047] Optionally, refer to Figures 1 to 5 The roll welding device also includes a first shaping mechanism 10 and a second shaping mechanism 8, which are sequentially arranged on the other side of the roll welding machine body 1. After welding, a tower-shaped area is formed at the outer end of the pole ear 61. The first shaping mechanism 10 is used to arrange the tower-shaped area so that the second shaping mechanism 8 can cut off the tower-shaped area.

[0048] Specifically, in the actual production process, since the pole lug 61 usually has a multi-layer structure, after welding is completed, a tower-shaped area will be formed at the end of the pole lug 61 away from the pole core 6. This tower-shaped area will affect the consistency of the state of the pole lug 61. In this embodiment, by setting a first shaping mechanism 10 and a second shaping mechanism 8, when the pole core 6 is conveyed to the shaping position, the pole lug 61 at its end first passes through the first shaping mechanism 10. After being shaped by the first shaping mechanism, the pole lug 61 after welding is smoother and free of wrinkles and bends, and then continues to enter the second shaping mechanism 8. The tower-shaped area is cut off by the second shaping mechanism 8 and a secondary shaping is performed, thereby achieving the purpose of shaping the pole lug 61 after welding.

[0049] In one embodiment, the first shaping mechanism 10 can be configured as a trumpet-shaped structure similar to the guide mechanism 5, and the tower-shaped area can be made flatter after the welded pole ear 61 passes through the first shaping mechanism 10. The second shaping mechanism 8 can include an upper shaping plate 81, a lower shaping plate 82, and a cutting knife 83. The pole ear 61 is pressed and shaped again by the upper shaping plate 81 and the lower shaping plate 82, so that the cutting knife 83 can accurately cut off the tower-shaped area.

[0050] Optionally, refer to Figures 1 to 5 The seam welding device also includes a frame 9, and the seam welding machine body 1, the guide mechanism 5, the first shaping mechanism 10, and the shaping mechanism 8 are respectively fixed on the frame 9.

[0051] Specifically, in this embodiment, the seam welding machine body 1, the guide mechanism 5, the first shaping mechanism 10 and the second shaping mechanism 8 can be fixed on the frame 9 in sequence along the second direction according to the process flow, and the frame 9 can be fixed at a fixed position of the production line, which improves the integrity of the ultrasonic seam welding device on the one hand, and can ensure the smooth progress of the entire process on the other hand.

[0052] According to a second aspect of the present invention, a battery is provided, comprising a pole core 6 and a multi-layer pole tab 61 located at one end of the pole core 6, wherein the multi-layer pole tab 61 is welded into one body by the ultrasonic rolling welding device described in the first aspect.

[0053] Specifically, the battery provided in this embodiment is welded by the ultrasonic roll welding device provided by the first aspect of the utility model during the welding process of the tab 61. Since the number of welding times is small and the quality of the product after welding is high, the safety of the entire battery is improved.

[0054] Optionally, refer to Figures 1 to 4 , and also includes a spacer 7, which is used to clamp at the root of the pole ear 61.

[0055] Specifically, in this embodiment, by providing a spacer 7 at the root of the pole lug 61 (i.e., the position of the pole lug 61 close to one side of the pole core 6), it can ensure that the multiple layers of loose pole lugs 61 can be pressed into a whole, so as to facilitate the subsequent welding process. Among them, the spacer 7 can be assembled at the root of the pole lug 61 by tooling equipment. For example, the spacer 7 can be designed as two mutually buckled snap-fit ​​structures, which are buckled and assembled at the root of the pole lug 61 by tooling equipment before the pole lug 61 is transferred to the set position. In actual production, in order to avoid the risk of short circuit of the pole core 6, the spacer 7 is usually made of insulating material.

[0056] Optionally, refer to Figure 6 , the distance between the spacer 7 and the guide mechanism 5 in the third direction (Z direction) (reference Figure 6The d) in the figure is 0.1-1 mm, and the third direction is perpendicular to the first direction and the second direction.

[0057] Specifically, in this embodiment, in order to prevent the tab 61 from interfering with the guide mechanism 5 when entering the guide mechanism 5, a certain distance between the tab 61 and the guide mechanism 5 is usually required in the third direction. The distance is preferably 0.1 to 1 mm, which can ensure that the tab 61 does not wrinkle or break when entering the guide mechanism 5, thereby ensuring the quality of the tab 61 welding.

[0058] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0059] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An ultrasonic roll welding device for a battery tab, characterized in that: include: Seam welding machine body, active seam welding wheel, driven seam welding wheel, transmission mechanism and guide mechanism; The active roll welding wheel and the driven roll welding wheel are assembled in parallel at one end of the roll welding machine body along a first direction, and the roll welding machine body can drive the active roll welding wheel to rotate; The conveying mechanism is used to place the pole cores of the battery, and can sequentially convey the plurality of pole cores along the second direction so that the pole ears of the pole cores are at the set positions, and the guide mechanism is fixed to one side of the active roll welding wheel and the driven roll welding wheel along the second direction, and the second direction is perpendicular to the first direction; When the conveying mechanism conveys the pole tab to the set position, the guiding mechanism can guide the pole tab to between the active roll welding wheel and the driven roll welding wheel, so that the active roll welding wheel welds the pole tab.

2. The ultrasonic roll welding device for battery tabs according to claim 1, characterized in that: The conveying mechanism includes a driving member, a conveying belt and a positioning structure. The driving member can drive the conveying belt to move along the second direction, and the positioning structure can fix the pole core on the conveying belt.

3. The ultrasonic roll welding device for battery tabs according to claim 1, characterized in that: The guide mechanism comprises an upper guide plate and a lower guide plate; The upper guide plate and the lower guide plate are close to each other along the second direction to form a trumpet shape, the opening side of the trumpet shape faces the set position, and the closing side of the trumpet shape extends between the active roll welding wheel and the driven roll welding wheel.

4. The ultrasonic roll welding device for battery tabs according to claim 3, characterized in that: The upper guide plate and the lower guide plate are both bent plates convex toward each other, and the upper guide plate and the lower guide plate are parallel to each other on the closing side, and the distance between them is less than the thickness of the pole ear, so as to press the pole ear.

5. The ultrasonic roll welding device for battery tabs according to claim 1, characterized in that: The distance between the guide mechanism and the center line of the active roll welding wheel along the second direction is 1 to 5 mm.

6. The ultrasonic roll welding device for battery tabs according to claim 1, characterized in that: It also includes a first shaping mechanism and a second shaping mechanism, which are sequentially arranged on the other side of the seam welding machine body. After the pole ear is welded, a tower-shaped area is formed at its outer end. The first shaping mechanism is used to arrange the tower-shaped area so that the second shaping mechanism can cut off the tower-shaped area.

7. The ultrasonic roll welding device for battery tabs according to claim 6, characterized in that: It also includes a frame, and the seam welding machine body, the guide mechanism, the first shaping mechanism and the second shaping mechanism are respectively fixed on the frame.

8. A battery, characterized in that: It comprises a pole core and a plurality of pole ears located at one end of the pole core, wherein the plurality of pole ears are welded into one by the ultrasonic rolling welding device according to any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that A spacer is also included, and the spacer is used for clamping at the root of the pole lug.

10. The battery according to claim 9, characterized in that The distance between the spacer and the guide mechanism in the third direction is 0.1-1 mm, and the third direction is perpendicular to the first direction and the second direction.

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