Welding heads, welding devices and battery production lines

Abstract

The present application relates to a welding head, a welding device and a battery production line. The welding head includes a welding head body, a plurality of welding teeth and a stress dispersion structure. The welding head body includes a mounting end and a welding end that are relatively arranged, and the welding end includes a first welding area and a second welding area arranged around the first welding area. A plurality of welding teeth are arranged in the first welding area, and a stress dispersion structure is arranged in the second welding area. Among them, along the direction from the mounting end to the welding end, the welding teeth are arranged farther away from the mounting end than from the second welding area. The welding head can be provided with a welding power that meets the welding requirements of the plurality of welding teeth in the first welding area. In this way, it is helpful to reduce the welding power of the welding head to a certain extent, and then it is helpful to reduce the situation where the pole ear is damaged due to excessive welding power, and the damage to the pole ear can be greatly reduced. The stress dispersion structure can also be used to reduce the stress concentration caused by the pressure holding of the second welding area, thereby reducing the risk of cracking of the pole ear due to stress concentration, and the damage to the pole ear can be well reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a welding head, a welding device and a battery production line. Background Art

[0002] In the related art, a welding device is usually used to weld the electrode tab of an electrode unit to an electrical connection sheet. However, the welding head of the conventional welding device causes significant damage to the electrode tab. Utility Model Content

[0003] Based on this, it is necessary to provide a welding head, a welding device and a battery production line to address the problem that the welding head of a traditional welding device causes significant damage to the tab.

[0004] According to a first aspect of the present application, a welding head is provided, comprising a welding head body, a plurality of welding teeth and a stress dispersion structure. The welding head body comprises a mounting end and a welding end arranged opposite to each other, and the welding end comprises a first welding area and a second welding area arranged around the first welding area. The plurality of welding teeth are arranged in the first welding area, and the stress dispersion structure is arranged in the second welding area. In the direction from the mounting end to the welding end, the welding teeth are arranged farther away from the mounting end than from the second welding area.

[0005] In the technical solution of the present application, since the welding teeth are arranged farther away from the mounting end than the second welding area along the direction pointing from the mounting end to the welding end, when the second welding area of ​​the welding end is pressed on the pole ear of the electrode unit, the second welding area of ​​the welding end can be used to hold and fix the pole ear well, and the multiple welding teeth located in the first welding area can be inserted into the pole ear or even the electrical adapter, and can form sufficient contact with the pole ear, so that the multiple welding teeth of the first welding area can provide an effective channel for the overcurrent temperature rise of the battery unit. In addition, the contact between the second welding area and the pole ear is worse than that of the first welding area. Therefore, the first welding area has the main welding function, and the second welding area has the auxiliary welding function, which can provide the welding head with welding power that meets the welding requirements of the multiple welding teeth of the first welding area. In this way, it is beneficial to reduce the welding power of the welding head to a certain extent, and then it is beneficial to reduce the situation where the pole ear is damaged due to excessive welding power, and the damage to the pole ear can be greatly reduced.

[0006] In addition, the stress dispersion structure can be used to reduce the stress concentration caused by the pressure of the second welding area, thereby reducing the risk of cracking of the tab due to stress concentration, which can greatly reduce the damage to the tab.

[0007] In one embodiment, the stress dispersion structure includes at least one chamfered surface provided in the second welding area. When the welding head is used, a certain welding power is applied to the welding head during the welding operation using the welding head, so that the welding head generates mechanical vibration, and the mechanical vibration can cause a small swing at the chamfered surface, so that the force applied to the chamfered surface can be pressed on the tab more evenly, reducing the probability of stress concentration, and thus reducing the risk of cracking of the tab. In addition, the chamfered surface can also be used to improve the problem of overflow accumulation at the edge of the tab.

[0008] In one embodiment, the first welding area and the second welding area are arranged at intervals along the direction from the first welding area to the second welding area. In the direction from the first welding area to the second welding area, the first welding area and the second welding area are arranged at intervals, which is convenient for arranging multiple welding teeth in the first welding area and arranging a stress dispersion structure in the second welding area. In this way, multiple welding teeth can be well utilized to undertake the main welding function, and the stress dispersion structure can be well utilized to reduce the probability of stress concentration in the second welding area, thereby reducing the risk of cracking of the tab.

[0009] In one embodiment, the welding head further includes a fence portion disposed around the plurality of welding teeth, the fence portion defining a first welding area and used to separate the first welding area from a second welding area. By providing the fence portion, it is convenient to form a plurality of welding teeth within the fence portion, and it is also convenient to form a stress dispersion structure outside the fence portion.

[0010] In one embodiment, the fence portion includes at least one first fence portion extending along a first direction, and at least one second fence portion extending along a second direction. The first fence portion and the second fence portion are connected end to end, and the dimension of the first fence portion along the first direction is greater than the dimension of the second fence portion along the second direction, wherein the first direction and the second direction are perpendicular to the direction from the mounting end to the welding end. This is convenient for the fence portion to maximize the use of the occupied area of ​​the welding end, which is beneficial to increase the occupied area of ​​the first welding area, thereby facilitating an increase in the number of welding teeth, thereby facilitating an improvement in the welding efficiency of the welding head.

[0011] In one embodiment, the stress dispersion structure includes at least one chamfered surface provided in the second welding area, and at least one of all the first fence parts and all the second fence parts is provided with a chamfered surface on the side away from the first welding area. In the process of using the welding head for welding, a certain welding power will be applied to the welding head. Since the first welding area has good contact with the pole ear, the welding head will swing slightly based on the area outside the first fence part or the second fence part. The chamfered surface can be provided on the side of the first fence part and / or the second fence part away from the first welding area, and then the chamfered surface can be used to make the force applied to the chamfered surface press on the pole ear more evenly, thereby reducing the probability of stress concentration, and thus reducing the risk of cracking of the pole ear.

[0012] In one embodiment, at least one chamfered surface includes a first chamfered surface provided on a side of the first fence portion away from the first welding area. Since the dimension of the first fence portion along the first direction is greater than the dimension of the second fence portion along the second direction, the area of ​​the second welding area provided on a side of the first fence portion away from the first welding area is larger than the area of ​​the second welding area provided on a side of the second fence portion away from the first welding area. Therefore, the first chamfered surface provided on a side of the first fence portion away from the first welding area is more conducive to reducing the probability of stress concentration, thereby reducing the risk of cracking of the tab.

[0013] In one embodiment, the first chamfered surface includes a plurality of sub-chamfered surfaces, and the plurality of sub-chamfered surfaces are arranged in a direction from the first welding area to the second welding area, and the angle between the sub-chamfered surface and the target plane is larger as it is farther away from the first welding area, wherein the target plane is a plane perpendicular to the direction from the mounting end to the welding end. In the process of welding with a welding head, a certain welding power is applied to the welding head. Since the first welding area has good contact with the tab, if the welding head is swung slightly based on the area outside the first fence portion, the first chamfered surface can be set on the side of the first fence portion away from the first welding area, and the first chamfered surface includes a plurality of sub-chamfered surfaces. In this way, the gradually transitioning plurality of sub-chamfered surfaces can well hold the tab during the small swing process, and form a relatively uniform holding force on the tab, thereby well reducing the probability of stress concentration, and thereby reducing the risk of cracking of the tab.

[0014] In one embodiment, an arc-shaped connecting surface is provided between two adjacent sub-chamfered surfaces. The arc-shaped connecting surface can be used to make an arc-shaped transition between two adjacent sub-chamfered surfaces, so that when the first chamfered surface is pressed on the tab, the damage to the tab by the first chamfered surface can be reduced.

[0015] In one embodiment, the first chamfered surface includes two sub-chamfered surfaces, and the angle between the sub-chamfered surface close to the first welding area and the target plane is α, where 0°<α≤3°; and / or the angle between the sub-chamfered surface away from the first welding area and the target plane is β, where 5°≤β≤8°. The angle between the sub-chamfered surface close to the first welding area and the target plane is set to 0°<α≤3°, which can not only make good use of the sub-chamfered surface to hold the tab, but also make the sub-chamfered surface form a relatively uniform holding force on the tab during a small swing. The angle between the sub-chamfered surface away from the first welding area and the target plane is set to 5°≤β≤8°, which can not only hold the tab well during a small swing, but also cooperate well with the sub-chamfered surface close to the first welding area, so that multiple sub-chamfered surfaces form a relatively uniform holding force on the tab during a small swing.

[0016] In one embodiment, the fence portion includes two first fence portions spaced apart along the second direction, and at least one chamfered surface includes two first chamfered surfaces corresponding to the two first fence portions one by one, and the first chamfered surface is provided on a side of the corresponding first fence portion away from the first welding area. During the welding operation using the welding head, the welding head will swing slightly, so that the first chamfered surfaces on both sides can respectively hold the tabs, and a more uniform holding force can be formed on the tabs during the slight swinging process.

[0017] In one embodiment, the fence portion includes two second fence portions arranged at intervals along the first direction, and at least one chamfered surface includes two second chamfered surfaces corresponding to the two second fence portions one by one, and the second chamfered surface is arranged on a side of the corresponding second fence portion away from the first welding area. If the welding head is swung slightly based on the area outside the second fence portion, the second chamfered surfaces outside the second fence portions on both sides can respectively hold the tabs, and a more uniform holding force can be better formed on the tabs during the slight swing.

[0018] In one embodiment, at least one chamfered surface includes a second chamfered surface provided on a side of the second fence portion away from the first welding area, and the angle between the second chamfered surface and the target plane is, wherein 0°<γ≤5°. The target plane is a plane perpendicular to the direction from the mounting end to the welding end. Setting the angle between the second chamfered surface and the target plane to 0°<γ≤5° can not only make good use of the second chamfered surface to hold the tab, but also make the second chamfered surface form a relatively uniform holding force on the tab during a small swing.

[0019] In one embodiment, at least one chamfered surface includes a first chamfered surface provided on a side of the first fence portion away from the first welding area, and a second chamfered surface provided on a side of the second fence portion away from the first welding area, and the welding head also includes a first rounded structure provided in the second welding area, and at least a portion of the first rounded structure is located between the first chamfered surface and the second chamfered surface. The first rounded structure can be used to achieve an arc transition between the first chamfered surface and the second chamfered surface, which can reduce the probability of stress concentration and is also conducive to reducing the probability of sharp corners on the welding end damaging the pole ear.

[0020] In one embodiment, a second rounded corner structure is provided between the first fence portion and the second fence portion. The second rounded corner structure can be used to achieve an arc transition between the first fence portion and the second fence portion, which can reduce the probability of stress concentration and also help reduce the probability of sharp corners on the welding end damaging the tab.

[0021] In one embodiment, the welding head includes a first edge portion provided at a side of the second welding area away from the first fence portion, and a second edge portion provided at a side of the second welding area away from the second fence portion. The welding head also includes a third chamfered structure, and the third chamfered structure is provided between the first edge portion and the adjacent second edge portion. The third chamfered structure can be used to achieve an arc transition between the first edge portion and the second edge portion, which can reduce the probability of stress concentration and is also conducive to reducing the probability of sharp corners on the welding end damaging the pole ear.

[0022] In one embodiment, the welding head includes a first edge portion provided on the side of the second welding area away from the first fence portion, and a second edge portion provided on the side of the second welding area away from the second fence portion; the orthographic projection of the first edge portion in the target plane is configured as a rectangular pattern; the orthographic projection of the second edge portion in the target plane is configured as an arc ring pattern. The target plane is a plane perpendicular to the direction from the mounting end to the welding end. The second edge portion has an arc-shaped structure, which can reduce the probability of stress concentration, and can also reduce the probability of sharp corners on the welding end damaging the tab, and can improve the cracking abnormality of the tab along the width direction (i.e., the short side direction) of the welding head body.

[0023] In one embodiment, a rough structure is provided on the stress dispersion structure, and a "micro-welding" is formed between the rough structure and the tab, thereby greatly reducing damage to the tab, thereby improving the abnormal cracking of the tab outside the first welding area.

[0024] According to a second aspect of the present application, a welding device is provided, comprising a welding head according to any one of the above embodiments.

[0025] According to a third aspect of the present application, a battery production line is provided, comprising the above-mentioned welding device.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0028] Figure 1 A side view (first viewing angle) of a welding head according to an embodiment of the present application is shown.

[0029] Figure 2A side view (second viewing angle) of a welding head according to an embodiment of the present application is shown.

[0030] Figure 3 An enlarged schematic diagram of point A of a welding head according to an embodiment of the present application is shown.

[0031] Figure 4 An enlarged schematic diagram of point B of a welding head according to an embodiment of the present application is shown.

[0032] Figure 5 A bottom view of a welding head according to an embodiment of the present application is shown.

[0033] Figure 6 An enlarged schematic diagram of point A of a welding head according to another embodiment of the present application is shown.

[0034] Figure 7 An enlarged schematic diagram of point B of a welding head according to another embodiment of the present application is shown.

[0035] Figure 8 A bottom view of a welding head according to another embodiment of the present application is shown.

[0036] Fig. 9 An enlarged schematic diagram of point A of a welding head according to yet another embodiment of the present application is shown.

[0037] Fig.10 An enlarged schematic diagram of point B of a welding head according to yet another embodiment of the present application is shown.

[0038] Fig.11 A bottom view of a welding head according to yet another embodiment of the present application is shown.

[0039] Fig.12 An enlarged schematic diagram of point A of a welding head according to another embodiment of the present application is shown.

[0040] Fig.13 An enlarged schematic diagram of point B of a welding head according to another embodiment of the present application is shown.

[0041] Fig.14 A bottom view of a welding head according to another embodiment of the present application is shown.

[0042] Fig.15 An enlarged schematic diagram of point A of a welding head according to another embodiment of the present application is shown.

[0043] Reference numerals:

[0044] 1. Welding head; 100. Welding head body; 110. Mounting end; 120. Welding end; 121. First welding area; 122. Second welding area; 200. Welding teeth; 300. Stress dispersion structure; 310. Chamfered surface; 311. First chamfered surface; 3111. Sub-chamfered surface; 3112. Arc connecting surface; 312. Second chamfered surface; 320. Arc surface; 400. Fence part; 410. First fence part; 420. Second fence part; 510. First chamfered structure; 430. Second chamfered structure; 520. Third chamfered structure; 610. First edge part; 620. Second edge part; 20. Vibration transmission part; 30. Load-bearing part. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0047] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0051] In the related art, during the welding process of the pole lug in the area where the welding teeth are set, there is a large strain deformation in the edge area around the welding teeth, which leads to stress concentration in the edge area around the welding teeth, and then causes abnormal cracking of the pole lug. Therefore, the welding teeth of the welding head of the traditional welding device cause great damage to the pole lug.

[0052] In order to solve the problem that the welding head of the traditional welding device causes serious damage to the pole ear, the present application designs a welding head. By partitioning the welding head, the situation of damage to the pole ear due to excessive welding power can be reduced, and the damage to the pole ear can be reduced to a large extent.

[0053] The welding head, welding device and / or battery production line disclosed in the embodiments of the present application can be used in, but not limited to, battery production.

[0054] Figure 1 and Figure 2Side views of the welding head from different viewing angles are shown respectively.

[0055] Please refer to Figure 1 and Figure 2 The welding head 1 includes a welding head body 100, and the welding head 1 also includes a vibration transmitting part 20 and a load-bearing part 30. The load-bearing part 30 is arranged on the top side of the welding head body 100, and the vibration transmitting part 20 is arranged on one side of the connection between the welding head body 100 and the load-bearing part 30.

[0056] The vibration transmitting portion 20 refers to a portion of the welding head 1 that is used to connect to a device transducer of the welding device.

[0057] The load-bearing portion 30 refers to a portion of the welding head 1 used to bear an external holding force. For example, the load-bearing portion 30 may be connected to a cylinder to transmit the driving force of the cylinder to the welding head body 100 , thereby providing a holding force on the pole lug.

[0058] The welding head body 100 includes a mounting end 110 and a welding end 120 which are arranged opposite to each other.

[0059] The mounting end 110 refers to an end of the welding head body 100 disposed close to the load-bearing portion 30 .

[0060] The welding end 120 refers to an end portion of the welding head body 100 used for contacting and welding a workpiece to be welded.

[0061] Figure 3 FIG. 1 shows an enlarged schematic diagram of a welding head at A according to an embodiment of the present application. Figure 4 FIG. 1 shows an enlarged schematic diagram of a welding head at B according to an embodiment of the present application. Figure 5 A bottom view of a welding head according to an embodiment of the present application is shown.

[0062] Please refer to Figure 3-Figure 5 The welding head 1 further includes a plurality of welding teeth 200 and a stress dispersion structure 300. The welding end 120 includes a first welding area 121 and a second welding area 122 arranged around the first welding area 121. The plurality of welding teeth 200 are arranged in the first welding area 121, and the stress dispersion structure 300 is arranged in the second welding area 122, so that the zoning design of the welding head 1 can be realized.

[0063] In the direction from the mounting end 110 to the welding end 120 , the welding tooth 200 is disposed farther away from the mounting end 110 than the second welding area 122 .

[0064] The first welding area 121 refers to the area on the welding end 120 for arranging a plurality of welding teeth 200, and the second welding area 122 refers to the area on the welding end 120 for arranging around the first welding area 121 and for pressing the workpiece to be welded. The workpiece to be welded includes a tab and an electrical adapter.

[0065] The welding tooth 200 refers to a tooth disposed in the first welding area 121 and capable of being inserted into a workpiece to be welded. For example, the welding tooth 200 may be a ball tooth or a cone tooth.

[0066] The plurality of welding teeth 200 may be evenly distributed in the first welding area 121 .

[0067] “In the direction from the mounting end 110 to the welding end 120, the welding tooth 200 is arranged farther from the mounting end 110 than the second welding area 122” can be understood as follows: if the welding end 120 is arranged upward, the top of the welding tooth 200 is higher than the second welding area 122; if the welding end 120 is arranged downward, the bottom of the welding tooth 200 is lower than the second welding area 122. When the welding head 1 is used, the welding end 120 is usually arranged downward, and at this time, the bottom of the welding tooth 200 is lower than the second welding area 122.

[0068] The stress dispersion structure 300 refers to a structure that can disperse the force exerted by the second welding area 122 on the tab, and can be a chamfered surface or an arc surface, which is not specifically limited here.

[0069] In the technical solution of the present application, since the welding teeth 200 are arranged farther away from the mounting end 110 than the second welding area 122 along the direction pointing from the mounting end 110 to the welding end 120, when the second welding area 122 of the welding end 120 is pressed on the tab of the electrode monomer, the second welding area 122 of the welding end 120 can be used to hold and fix the tab well, and the plurality of welding teeth 200 located in the first welding area 121 can be inserted into the tab or even the electrical adapter sheet, and can form sufficient contact with the tab, so that the plurality of welding teeth 200 in the first welding area 121 can be inserted into the tab and ... the plurality of welding teeth 200 in the first welding area 121 can be inserted into the tab and even 00 can provide an effective channel for the overcurrent temperature rise of the battery cell. In addition, the second welding area 122 has a poorer contact with the pole ear than the first welding area 121. Therefore, the first welding area 121 has the main welding function, and the second welding area 122 has the auxiliary welding function, which can provide the welding head 1 with welding power that meets the welding requirements of the multiple welding teeth 200 of the first welding area 121. In this way, it is beneficial to reduce the welding power of the welding head 1 to a certain extent, and then it is beneficial to reduce the situation where the pole ear is damaged due to excessive welding power, and the damage to the pole ear can be greatly reduced. In addition, since the second welding area 122 is not provided with welding teeth 200, but a stress dispersion structure 300 is provided in the second welding area 122, the stress dispersion structure 300 can be used to reduce the stress concentration caused by the pressing of the second welding area 122, thereby reducing the risk of cracking of the pole ear due to stress concentration, and the damage to the pole ear can be well reduced.

[0070] In some embodiments, along the direction from the mounting end 110 to the welding end 120, the distance between the side of the welding tooth 200 close to the mounting end 110 and the side of the second welding area 122 away from the mounting end 110 is H1,0 ​

[0071] Illustratively, H1 is 0.05 mm, 0.1 mm, 0.2 mm or 0.3 mm.

[0072] When the dimension of the welding tooth 200 along the direction from the mounting end 110 to the welding end 120 remains unchanged, H1 is set to 0.

[0073] In some embodiments, the stress dispersion structure 300 includes at least one chamfered surface 310 disposed on the second soldering region 122 .

[0074] One chamfered surface 310 may be provided in the second welding area 122 , or two, three, four or more chamfered surfaces 310 may be provided in the second welding area 122 , and no specific limitation is made herein.

[0075] The chamfered surface 310 refers to an inclined surface formed at the edge of the second welding region 122 .

[0076] When the welding head 1 is used, a certain welding power is applied to the welding head 1 during the welding operation, so that the welding head 1 generates mechanical vibration, which can cause the chamfered surface 310 to swing slightly, so that the force applied to the chamfered surface 310 can be pressed on the tab more evenly, reducing the probability of stress concentration, and thus reducing the risk of tab cracking. In addition, the chamfered surface 310 can also be used to improve the problem of overflow accumulation at the edge of the tab.

[0077] In some embodiments, along the direction from the first welding area 121 to the second welding area 122 , the first welding area 121 and the second welding area 122 are arranged at intervals.

[0078] In the direction from the first welding area 121 to the second welding area 122, the first welding area 121 and the second welding area 122 are arranged at intervals, which is convenient for setting a plurality of welding teeth 200 in the first welding area 121 and also for setting a stress dispersion structure 300 in the second welding area 122. In this way, the plurality of welding teeth 200 can be well utilized to undertake the main welding function, and the stress dispersion structure 300 can be well utilized to reduce the probability of stress concentration in the second welding area 122, thereby reducing the risk of cracking of the tab.

[0079] In some embodiments, along the direction from the first welding area 121 to the second welding area 122 , the distance between the first welding area 121 and the second welding area 122 is 0.3 mm-0.7 mm.

[0080] ​For example, along the direction from the first welding area 121 to the second welding area 122 , the distance between the first welding area 121 and the second welding area 122 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or 0.7 mm.

[0081] The spacing between the first welding area 121 and the second welding area 122 along the direction from the first welding area 121 to the second welding area 122 is set to 0.3mm-0.7mm, which is beneficial to the processing of the welding teeth 200 and the stress dispersion structure 300, and can reduce the situation where the overall occupied size of the first welding area 121 and the second welding area 122 is too large.

[0082] In some embodiments, the welding head 1 further includes a fence portion 400 disposed around the plurality of welding teeth 200 . The fence portion 400 defines the first welding area 121 and is used to separate the first welding area 121 from the second welding area 122 .

[0083] The fence portion 400 refers to a portion of the welding head 1 that is disposed around the first welding area 121 and is located between the first welding area 121 and the second welding area 122 .

[0084] The fence portion 400 may be disposed so as to half surround the first welding area 121 ; or the fence portion 400 may be disposed so as to fully surround the first welding area 121 , which is not specifically limited herein.

[0085] By providing the fence portion 400 , it is convenient to form a plurality of welding teeth 200 inside the fence portion 400 , and it is also convenient to form a stress dispersion structure 300 outside the fence portion 400 .

[0086] In some embodiments, a groove is disposed in the fence portion 400 , and a plurality of welding teeth 200 are disposed on the bottom wall of the groove.

[0087] A plurality of welding teeth 200 may be evenly arranged on the bottom wall of the groove.

[0088] It can be understood that one end of the welding tooth 200 away from the bottom wall of the groove protrudes out of the groove, so that multiple welding teeth 200 can be inserted into the pole ear or even the electrical adapter to form sufficient contact with the pole ear.

[0089] In some embodiments, the fence portion 400 includes at least one first fence portion 410 extending along a first direction F1, and at least one second fence portion 420 extending along a second direction F2, the first fence portion 410 and the second fence portion 420 are connected end to end, and a size of the first fence portion 410 along the first direction F1 is greater than a size of the second fence portion 420 along the second direction F2, wherein the first direction F1 and the second direction F2 are perpendicular to each other and the direction from the mounting end 110 to the welding end 120.

[0090] Since the size of the first fence portion 410 along the first direction F1 is greater than the size of the second fence portion 420 along the second direction F2, taking the example that the first direction F1 is parallel to the length direction (i.e., the long side direction) of the welding head body 100 and the second direction F2 is parallel to the width direction (i.e., the short side direction) of the welding head body 100, the first fence portion 410 is the portion of the fence portion 400 extending along the length direction of the welding end 120, and the second fence portion 420 is the portion of the fence portion 400 extending along the width direction of the welding end 120. In this way, the fence portion 400 can maximize the use of the occupied area of ​​the welding end 120, which is beneficial to increase the occupied area of ​​the first welding area 121, and further help to increase the number of welding teeth 200, and further help to improve the welding efficiency of the welding head 1.

[0091] In some embodiments, the stress dispersion structure 300 includes at least one chamfered surface 310 disposed on the second welding region 122 , and at least one of all the first fence portions 410 and all the second fence portions 420 has a chamfered surface 310 on a side away from the first welding region 121 .

[0092] It may be that one of the first fence portions 410 is provided with a chamfered surface 310 on the side away from the first welding area 121; it may also be that all the first fence portions 410 are provided with a chamfered surface 310 on the side away from the first welding area 121; it may also be that one of the second fence portions 420 is provided with a chamfered surface 310 on the side away from the first welding area 121; it may also be that all the second fence portions 420 are provided with a chamfered surface 310 on the side away from the first welding area 121; of course, it may also be that all the first fence portions 410 and all the second fence portions 420 are provided with a chamfered surface 310 on the side away from the first welding area 121.

[0093] During the welding operation using the welding head 1, a certain welding power will be applied to the welding head 1. Since the first welding area 121 has good contact with the pole ear, the welding head 1 will swing slightly based on the area outside the first fence portion 410 or the second fence portion 420. A chamfered surface 310 can be set on the side of the first fence portion 410 and / or the second fence portion 420 away from the first welding area 121, and the chamfered surface 310 can be used to make the force applied to the chamfered surface 310 more evenly pressed on the pole ear, thereby reducing the probability of stress concentration and reducing the risk of cracking of the pole ear.

[0094] In some embodiments, the at least one chamfered surface 310 includes a first chamfered surface 311 disposed on a side of the first fence portion 410 away from the first welding region 121 .

[0095] The first chamfered surface 311 refers to the chamfered surface 310 disposed on a side of the first fence portion 410 away from the first welding region 121 .

[0096] Since the size of the first fence portion 410 along the first direction F1 is greater than the size of the second fence portion 420 along the second direction F2, the area of ​​the second welding area 122 located on the side of the first fence portion 410 away from the first welding area 121 is larger than the area of ​​the second welding area 122 located on the side of the second fence portion 420 away from the first welding area 121. Therefore, the first chamfered surface 311 located on the side of the first fence portion 410 away from the first welding area 121 is more conducive to reducing the probability of stress concentration, thereby reducing the risk of cracking of the tab.

[0097] In some embodiments, the first chamfered surface 311 includes a plurality of sub-chamfered surfaces 3111, and the plurality of sub-chamfered surfaces 3111 are arranged in a direction from the first welding area 121 to the second welding area 122. The angle between the sub-chamfered surface 3111 and the target plane is larger as it is farther away from the first welding area 121, wherein the target plane is a plane perpendicular to the direction from the mounting end 110 to the welding end 120.

[0098] The sub-chamfered surface 3111 refers to a portion of the first chamfered surface 311 , and the angle between the sub-chamfered surface 3111 and the target plane becomes larger as it is further away from the first welding region 121 .

[0099] Taking the plane in the direction from the mounting end 110 to the welding end 120 being parallel to the gravity direction of the welding head as an example, the target plane may be a horizontal plane, that is, the further away from the first welding area 121 the sub-chamfered surface 3111 is, the greater the inclination relative to the horizontal plane.

[0100] The included angle between the sub-chamfered surface 3111 and the target plane is an acute angle.

[0101] During the welding operation using the welding head 1, a certain welding power will be applied to the welding head 1. Since the first welding area 121 has good contact with the pole ear, if the welding head 1 is swung slightly based on the area outside the first fence portion 410, a first chamfered surface 311 can be set on the side of the first fence portion 410 away from the first welding area 121, and the first chamfered surface 311 includes multiple sub-chamfered surfaces 3111. In this way, the gradually transitioned multiple sub-chamfered surfaces 3111 can hold the pole ear well during the small swing process and form a relatively uniform pressing force on the pole ear, thereby greatly reducing the probability of stress concentration and reducing the risk of cracking of the pole ear.

[0102] In some embodiments, an arc-shaped connecting surface 3112 is provided between two adjacent sub-chamfered surfaces 3111 .

[0103] The arc-shaped connecting surface 3112 refers to an arc-shaped surface connected between two adjacent sub-chamfered surfaces 3111 .

[0104] The arc-shaped connecting surface 3112 can be used to make an arc-shaped transition between two adjacent sub-chamfered surfaces 3111, so that when the first chamfered surface 311 is pressed on the pole ear, the damage to the pole ear by the first chamfered surface 311 can be reduced.

[0105] In some embodiments, the first chamfered surface 311 may include two sub-chamfered surfaces 3111, and the angle between the sub-chamfered surface 3111 close to the first welding area 121 and the target plane is α, where 0°<α≤3°; or the first chamfered surface 3111 may include two sub-chamfered surfaces 3111, and the angle between the sub-chamfered surface 3111 away from the first welding area 121 and the target plane is β, where 5°<β≤8°. It may also be that the first chamfered surface 3111 includes two sub-chamfered surfaces 3111, and the angle between the sub-chamfered surface 3111 close to the first welding area 121 and the target plane is α, where 0°<α≤3°; the angle between the sub-chamfered surface 3111 away from the first welding area 121 and the target plane is β, where 5°≤β≤8°.

[0106] Illustratively, α is 0.5°, 1°, 1.5°, 2°, 2.5° or 3°, and β is 5°, 5.5°, 6°, 6.5°, 7°, 7.5° or 8°.

[0107] Specific to Figure 6-Figure 8 In the embodiment shown, α is 2.5° and β is 6.5°.

[0108] The angle between the sub-chamfered surface 3111 near the first welding area 121 and the target plane is set to 0°<α≤3°, which can not only make good use of the sub-chamfered surface 3111 to press the pole ear, but also make the sub-chamfered surface 3111 form a relatively uniform pressing force on the pole ear during a small swing.

[0109] The angle between the sub-chamfered surface 3111 away from the first welding area 121 and the target plane is set to 5°≤β≤8°, which can not only hold the pole ear well during a small swing, but also cooperate well with the sub-chamfered surface 3111 close to the first welding area 121, so that multiple sub-chamfered surfaces 3111 can form a relatively uniform pressing force on the pole ear during a small swing.

[0110] In some embodiments, Figure 9-11 As shown, the fence portion 400 includes two first fence portions 410 arranged at intervals along the second direction, and at least one chamfered surface 310 includes two first chamfered surfaces 311 corresponding one to the two first fence portions 410, and the first chamfered surface 311 is arranged on the side of the corresponding first fence portion 410 away from the first welding area 121.

[0111] It can be understood that the two first chamfered surfaces 311 are symmetrically arranged with the symmetry center axes of the two first fence parts 410 as reference objects. During the welding operation using the welding head 1, the welding head will produce a small swing, which can make the first chamfered surfaces 311 on both sides press the pole ears respectively, and better form a more uniform pressing force on the pole ears during the small swing process.

[0112] In some embodiments, the fence portion 400 includes two second fence portions 420 arranged at intervals along the first direction F1, and at least one chamfered surface 310 includes two second chamfered surfaces 312 corresponding one to the two second fence portions 420, and the second chamfered surface 312 is arranged on the side of the corresponding second fence portion 420 away from the first welding area 121.

[0113] The second chamfered surface 312 refers to the chamfered surface 310 disposed on a side of the second fence portion 420 away from the first welding region 121 .

[0114] It can be understood that the two second chamfered surfaces 312 are symmetrically arranged with the symmetry center axes of the two second fence portions 420 as reference objects. During the welding operation using the welding head 1, a certain welding power will be applied to the welding head 1. Since the first welding area 121 has good contact with the pole ear, if the welding head 1 is swung slightly based on the area outside the second fence portion 420, the second chamfered surfaces 312 outside the second fence portions 420 on both sides can respectively press the pole ear, and better form a more uniform pressing force on the pole ear during the small swing process.

[0115] In some embodiments, at least one chamfered surface 310 includes a second chamfered surface 312 disposed on the side of the second fence portion 420 away from the first welding area 121; the angle between the second chamfered surface 312 and the target plane is γ, where 0°<γ≤5°, and the target plane is a plane perpendicular to the direction of the mounting end 110 pointing to the welding end 120.

[0116] Illustratively, γ is 0.5°, 1°, 1.5°, 2°, 2.5°, 3°, 3.5°, 4°, 4.5°, or 5°.

[0117] A second chamfered surface 312 can be set on the side of the second fence portion 420 away from the first welding area 121. In this way, the two second chamfered surfaces 312 can form a relatively uniform pressing force on the pole ear during a small swing, thereby effectively reducing the probability of stress concentration and the risk of cracking of the pole ear. In addition, the angle between the second chamfered surface 312 and the target plane is set to 0°<γ≤5°, which can not only make good use of the second chamfered surface 312 to hold the pole ear, but also enable the second chamfered surface 312 to form a relatively uniform pressing force on the pole ear during a small swing.

[0118] In some embodiments, at least one chamfered surface 310 includes a first chamfered surface 311 disposed on a side of the first fence portion 410 away from the first welding area 121, and a second chamfered surface 312 disposed on a side of the second fence portion 420 away from the first welding area 121. The welding head also includes a first chamfered structure 510 disposed in the second welding area 122, and at least a portion of the first chamfered structure 510 is located between the first chamfered surface 311 and the second chamfered surface 312.

[0119] It can be, for example Figure 6-Figure 8 The embodiments shown and Figure 12-14 In the embodiment shown, the first rounded structure 510 is located between the first chamfered surface 311 and the second chamfered surface 312; Figure 3-Figure 5 The embodiments shown and Figure 9-11 In the illustrated embodiment, a portion of the first rounded structure 510 is located between the first chamfered surface 311 and the second chamfered surface 312 , and another portion of the first rounded structure 510 is located between the second fence portion 420 and the second chamfered surface 312 .

[0120] In this way, the first chamfered structure 510 can be used to achieve an arc transition between the first chamfered surface 311 and the second chamfered surface 312 , which can reduce the probability of stress concentration and also help reduce the probability of sharp corners on the welding end 120 damaging the tab.

[0121] In some embodiments, a second rounded corner structure 430 is disposed between the first fence portion 410 and the second fence portion 420 .

[0122] Optionally, the radius of the arc surface of the second rounded corner structure 430 is 0.5 mm to 1.5 mm. For example, the radius of the arc surface of the second rounded corner structure 430 is 0.5 mm, 1.0 mm or 1.5 mm.

[0123] In this way, the second chamfered structure 430 can be used to achieve an arc transition between the first fence portion 410 and the second fence portion 420, which can reduce the probability of stress concentration and also help reduce the probability of sharp corners on the welding end 120 damaging the tab.

[0124] In some embodiments, the welding head includes a first edge portion 610 disposed on the side of the second welding area 122 away from the first fence portion 410, and a second edge portion 620 disposed on the side of the second welding area 122 away from the second fence portion 420. The welding head also includes a third chamfered structure 520, and a third chamfered structure 520 is disposed between the first edge portion 610 and the adjacent second edge portion 620.

[0125] Optionally, the radius of the arc surface of the third rounded corner structure 520 is 0.5 mm to 2.0 mm. For example, the radius of the arc surface of the third rounded corner structure 520 is 0.5 mm, 1.0 mm, 1.5 mm or 2.0 mm.

[0126] The first edge portion 610 refers to a component disposed on the welding end 120 and disposed on a side of the second welding region 122 away from the first fence portion 410 .

[0127] The second edge portion 620 refers to a component disposed on the welding end 120 and disposed on a side of the second welding region 122 away from the second fence portion 420 .

[0128] The third rounded corner structure 520 can be used to achieve an arc-shaped transition between the first edge portion 610 and the second edge portion 620 , which can reduce the probability of stress concentration and also help reduce the probability of sharp corners on the welding end 120 damaging the tab.

[0129] In some embodiments, see Figure 12-14 The welding head includes a first edge portion 610 arranged on the side of the second welding area 122 away from the first fence portion 410, and a second edge portion 620 arranged on the side of the second welding area 122 away from the second fence portion 420, the orthographic projection of the first edge portion 610 in the target plane is configured as a rectangular pattern, and the orthographic projection of the second edge portion 620 in the target plane is configured as an arc ring pattern, wherein the target plane is a plane perpendicular to the direction of the mounting end 110 pointing to the welding end 120.

[0130] For example, the orthographic projection of the second edge portion 620 in the target plane is configured as an elliptical ring pattern, that is, the second edge portion 620 has an ellipsoidal structure.

[0131] The second edge portion 620 has an arc-shaped structure, which can reduce the probability of stress concentration and the probability of sharp corners damaging the tab on the welding end 120, and can improve the abnormal cracking of the tab along the width direction (ie, the short side direction) of the welding head body 100.

[0132] In one embodiment, a rough structure is disposed on the stress dispersion structure 300 .

[0133] The stress dispersion structure 300 may be etched to form a rough structure. For example, the stress dispersion structure 300 may be electro-eroded or electro-spark eroded to form a rough structure.

[0134] The rough structure refers to a structure provided on the stress dispersion structure 300 and having tiny peaks and valleys, which is equivalent to forming a plurality of micro-teeth on the stress dispersion structure 300. The micro-teeth refer to teeth with a size of micrometer level.

[0135] In this way, micro teeth can be formed on the stress dispersion structure 300 , and “micro welding” can be formed with the tab by utilizing the rough structure, thereby greatly reducing damage to the tab and further improving abnormal cracking of the tab outside the first welding area 121 .

[0136] Of course, the present application is not limited to this. In other embodiments, the stress dispersion structure 300 may also be designed to be toothless, that is, the surface of the stress dispersion structure 300 is a smooth surface. In this way, the damage to the tab can be greatly reduced, thereby improving the abnormal cracking of the tab outside the first welding area 121.

[0137] In some embodiments, the welding end 120 includes a first welding area 121 and a second welding area 122 disposed around the first welding area 121, and a plurality of welding teeth 200 are disposed in the first welding area 121. In the direction from the mounting end 110 to the welding end 120, the welding teeth 200 are disposed farther away from the mounting end 110 than from the second welding area 122. The welding head 1 also includes a stress dispersion structure 300 disposed in the second welding area 122. The stress dispersion structure 300 includes at least one chamfered surface 310 disposed in the second welding area 122. The at least one chamfered surface 310 includes a first chamfered surface 311 disposed on a side of the first fence portion 410 away from the first welding area 121, and a second chamfered surface 312 disposed on a side of the second fence portion 420 away from the first welding area 121.

[0138] If the welding head 1 is swung slightly based on the area outside the first fence portion 410, the first chamfered surface 311 can be used to hold the pole ear, and the first chamfered surface 311 can form a relatively uniform holding force on the pole ear during the small swing. If the welding head 1 is swung slightly based on the area outside the second fence portion 420, the second chamfered surface 312 can be used to hold the pole ear, and the second chamfered surface 312 can form a relatively uniform holding force on the pole ear during the small swing. In this way, the probability of stress concentration can be greatly reduced, and the risk of cracking of the pole ear can be reduced. The first chamfered surface 311 can also be used to improve the problem of overflow accumulation in the long side area of ​​the pole ear edge, and the second chamfered surface 312 can also be used to improve the problem of overflow accumulation in the short side area of ​​the pole ear edge.

[0139] In some other embodiments, the stress dispersion structure 300 includes an arc surface 320 disposed on the second welding region 122 .

[0140] During the welding operation using the welding head 1, a certain welding power will be applied to the welding head 1, so that the welding head 1 will generate mechanical vibration. The mechanical vibration can cause the arc surface 320 to swing slightly, so that the force applied to the arc surface 320 can be pressed on the pole ear more evenly, reducing the probability of stress concentration. The arc surface 320 can reduce damage to the pole ear, thereby reducing the risk of cracking of the pole ear.

[0141] An embodiment of the present application provides a welding device, comprising the welding head 1 of any one of the above embodiments.

[0142] An embodiment of the present application provides a battery production line, including the above-mentioned welding device.

[0143] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0144] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A welding head, characterized in that: The welding head comprises: A welding head body (100) comprises a mounting end (110) and a welding end (120) which are arranged opposite to each other, wherein the welding end (120) comprises a first welding area (121) and a second welding area (122) which is arranged around the first welding area (121); A plurality of welding teeth (200) are arranged in the first welding area (121); and A stress dispersion structure (300) is provided in the second welding area (122); Wherein, along the direction from the mounting end (110) to the welding end (120), the welding tooth (200) is arranged farther away from the mounting end (110) than the second welding area (122).

2. The welding head according to claim 1, characterized in that: The stress dispersion structure (300) comprises at least one chamfered surface (310) provided in the second welding area (122).

3. The welding head according to claim 1, characterized in that: Along the direction from the first welding area (121) to the second welding area (122), the first welding area (121) and the second welding area (122) are arranged at intervals.

4. The welding head according to claim 3, characterized in that: The welding head further comprises a fence portion (400) arranged around the plurality of welding teeth (200), wherein the fence portion (400) defines the first welding area (121) and is used to separate the first welding area (121) from the second welding area (122).

5. The welding head according to claim 4, characterized in that: The fence portion (400) comprises at least one first fence portion (410) extending along a first direction, and at least one second fence portion (420) extending along a second direction; The first fence portion (410) and the second fence portion (420) are connected end to end; The dimension of the first fence portion (410) along the first direction is greater than the dimension of the second fence portion (420) along the second direction; The first direction and the second direction are perpendicular to the direction from the mounting end (110) to the welding end (120).

6. The welding head according to claim 5, characterized in that: The stress dispersion structure (300) comprises at least one chamfered surface (310) provided in the second welding area (122); At least one of all the first fence portions (410) and all the second fence portions (420) is provided with the chamfered surface (310) on a side away from the first welding area (121).

7. The welding head according to claim 6, characterized in that: The at least one chamfered surface (310) comprises a first chamfered surface (311) provided on a side of the first fence portion (410) away from the first welding area (121).

8. The welding head according to claim 7, characterized in that: The first chamfered surface (311) comprises a plurality of sub-chamfered surfaces (3111), and the plurality of sub-chamfered surfaces (3111) are arranged in a direction from the first welding area (121) to the second welding area (122); The further away from the first welding area (121), the larger the angle between the sub-chamfered surface (3111) and the target plane; The target plane is a plane perpendicular to a direction from the mounting end (110) to the welding end (120).

9. The welding head according to claim 8, characterized in that: An arc-shaped connecting surface (3112) is provided between two adjacent sub-chamfered surfaces (3111).

10. The welding head according to claim 8, characterized in that: The first chamfered surface (311) includes two sub-chamfered surfaces (3111); The angle between the sub-chamfered surface (3111) close to the first welding area (121) and the target plane is α, wherein 0°<α≤3°; and / or The included angle between the sub-chamfered surface (3111) away from the first welding area (121) and the target plane is β, wherein 5°≤β≤8°.

11. The welding head according to claim 6, characterized in that: The fence portion (400) comprises two first fence portions (410) arranged at intervals along the second direction; At least one of the chamfered surfaces (310) comprises two first chamfered surfaces (311) corresponding one to one to the two first fence portions (410); the first chamfered surfaces (311) are arranged on a side of the corresponding first fence portion (410) away from the first welding area (121).

12. The welding head according to claim 6, characterized in that: The fence portion (400) comprises two second fence portions (420) arranged at intervals along the first direction; At least one of the chamfered surfaces (310) comprises two second chamfered surfaces (312) corresponding one-to-one to the two second fence portions (420); the second chamfered surfaces (312) are arranged on a side of the corresponding second fence portion (420) away from the first welding area (121).

13. The welding head according to claim 6, characterized in that: The at least one chamfered surface (310) comprises a second chamfered surface (312) provided on a side of the second fence portion (420) away from the first welding area (121); The included angle between the second chamfered surface (312) and the target plane is γ, where 0°<γ≤5°; The target plane is a plane perpendicular to a direction from the mounting end (110) to the welding end (120).

14. The welding head according to claim 6, characterized in that: The at least one chamfered surface (310) comprises a first chamfered surface (311) provided on a side of the first fence portion (410) away from the first welding area (121), and a second chamfered surface (312) provided on a side of the second fence portion (420) away from the first welding area (121); The welding head further comprises a first chamfered structure (510) provided in the second welding area (122), wherein at least a portion of the first chamfered structure (510) is located between the first chamfered surface (311) and the second chamfered surface (312).

15. The welding head according to claim 5, characterized in that: A second rounded corner structure (430) is provided between the first fence portion (410) and the second fence portion (420).

16. The welding head according to claim 5, characterized in that: The welding head comprises a first edge portion (610) provided on a side of the second welding area (122) away from the first fence portion (410), and a second edge portion (620) provided on a side of the second welding area (122) away from the second fence portion (420); The welding head further comprises a third chamfered corner structure (520), wherein the third chamfered corner structure (520) is provided between the first edge portion (610) and the adjacent second edge portion (620).

17. The welding head according to claim 5, characterized in that: The welding head comprises a first edge portion (610) provided on a side of the second welding area (122) away from the first fence portion (410), and a second edge portion (620) provided on a side of the second welding area (122) away from the second fence portion (420); The orthographic projection of the first edge portion (610) in the target plane is configured as a rectangular pattern; The orthographic projection of the second edge portion (620) in the target plane is configured as an arc ring pattern; The target plane is a plane perpendicular to a direction from the mounting end (110) to the welding end (120).

18. The welding head according to any one of claims 1 to 17, characterized in that: The stress dispersion structure (300) is provided with a rough structure.

19. The welding head according to claim 1, characterized in that: The stress dispersion structure (300) comprises an arc surface (320) provided in the second welding area (122).

20. A welding device, characterized in that: Comprising a welding head as described in any one of claims 1-19.

21. A battery production line, characterized in that: Comprising a welding device as claimed in any one of Claims 20.

Images