Welding heads, welding equipment and battery production equipment

Abstract

This application relates to a welding head, welding apparatus, and battery production equipment. The welding head includes: a main body having a welding surface, on which independent first welding areas and second welding areas are formed; a first welding portion protruding and fixedly disposed on the welding surface of the first welding area; and a second welding portion protruding and rotatably disposed on at least a portion of the welding surface of the second welding area. This application provides a first welding area and a second welding area on the welding surface, wherein the first welding area has a first welding portion, and the second welding area has a second welding portion, and the second welding portion is rotatably disposed. In this way, the first welding portion plays a major welding role on the tab, while simultaneously, the second welding portion forms a rolling weld with the tab, which can reduce local stress concentration on the tab, reduce the frictional force on the tab, and improve the problem of tab cracking.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a welding head, welding device and battery production equipment. Background Technology

[0002] Electrode assemblies are crucial structures within battery cells where electrochemical reactions occur. They are typically formed by stacking and winding positive electrode sheets, separators, and negative electrode sheets, creating a main body and tabs. The tabs are formed by stacking multiple layers of positive or negative electrode sheets; therefore, during battery cell manufacturing, welding is usually used to fix the tabs in place to ensure a stable connection between the tabs and the electrode terminals.

[0003] However, as the energy density of individual battery cells increases, the number of positive and negative electrode layers gradually increases, leading to a gradual increase in the thickness of the tabs, which increases the probability of tab cracking during welding. Utility Model Content

[0004] Therefore, it is necessary to provide a welding head, welding device, and battery production equipment to address the problem that the probability of electrode cracking during welding increases due to the gradual increase in electrode thickness.

[0005] In a first aspect, this application provides a welding head for welding electrode tabs. The welding head includes a body, a first welding part, and a second welding part. The body has a welding surface, on which a first welding area and a second welding area are formed that are independent of each other. The first welding part protrudes and is fixedly disposed on the welding surface of the first welding area. The second welding part protrudes and is rotatably disposed on the welding surface of at least a portion of the second welding area.

[0006] With the above structure, the first welding part can play the main welding role on the electrode tab. At the same time, the second welding part forms a rolling weld with the electrode tab, which can reduce the local stress concentration of the electrode tab, reduce the friction force formed on the electrode tab, and improve the problem of electrode tab cracking.

[0007] In some embodiments, the second welding area is disposed around the outer periphery of the first welding area. With the above structure, when the first welding part and the second welding part cooperate to weld the electrode tab, the pressure on different positions of the electrode tab can be more uniform, thereby making the welding more stable.

[0008] In some embodiments, the ratio of the widths of the first weld area to the second weld area in the width direction of the weld surface ranges from 5:3 to 1:0.1.

[0009] Thus, by setting the width ratio between the first and second welding areas within the aforementioned range, a stable welding effect is achieved between the first welding part and the electrode tab in the first welding area. By reducing the friction force on the electrode tab through the rolling contact between the second welding part and the electrode tab in the second welding area, the electrode tab cracking is improved.

[0010] In some embodiments, the ratio of the widths of the first weld area to the second weld area in the width direction of the weld surface ranges from 5:2 to 5:1.

[0011] Therefore, by setting the ratio of the width between the first welding area and the second welding area within the above range, it is possible to further reduce the friction force on the electrode and improve electrode cracking while ensuring a stable welding effect between the first welding part and the electrode tab in the first welding area.

[0012] In some embodiments, the ratio of the lengths of the first weld area to the second weld area in the longitudinal direction of the weld surface ranges from 5:2 to 10:1.

[0013] Based on this, the ratio of the lengths between the first and second welding zones is set within the aforementioned range. While ensuring a stable welding effect between the first welding part and the electrode tab in the first welding zone, the rolling contact between the second welding part and the electrode tab in the second welding zone reduces the friction force on the electrode tab, thereby improving electrode tab cracking.

[0014] In some embodiments, the ratio of the lengths of the first weld area to the second weld area in the length direction of the weld surface ranges from 5:1 to 10:1.

[0015] Therefore, by setting the ratio of the lengths between the first and second welding zones within the aforementioned range, it is possible to further reduce the frictional force on the electrode tab and improve electrode tab cracking, while ensuring a stable welding effect between the first welding part and the electrode tab within the first welding zone.

[0016] In some embodiments, a plurality of spaced-apart receiving cavities are provided on the welding surface of the second welding zone, and the second welding part is constructed as a welding sphere, with at least one welding sphere movably disposed in each receiving cavity.

[0017] The above structure enables rolling contact between the second welded part and the electrode tab, reducing the frictional force on the electrode tab and thus improving electrode tab cracking. Furthermore, when pressure is applied to the electrode tab, the welding ball can move up and down within the corresponding receiving cavity, providing a certain buffering effect and achieving flexible welding of the electrode tab.

[0018] In some embodiments, in a direction perpendicular to the welding surface, the height by which the welding sphere protrudes beyond the corresponding welding surface is 1 / 5 to 3 / 5 of the diameter of the welding sphere.

[0019] The above structure effectively improves the buffering effect of the welding ball on the electrode surface when the welding head applies pressure to the electrode.

[0020] In some embodiments, the outer peripheral surface of the welding ball is configured as a smooth surface. This further reduces the frictional force on the tab surface when the welding ball contacts the tab, thereby further improving tab cracking.

[0021] In some embodiments, a transition zone is also formed on the welding surface. The transition zone is configured as a smooth surface and connects the first welding zone and the second welding zone.

[0022] Thus, when the welding head applies pressure to the tab, the contact between the smooth surface and the tab surface can further reduce the friction on the tab surface and further improve tab cracking.

[0023] In some embodiments, the body further has a side surface and a clearance arc surface, the clearance arc surface being connected between the outer peripheral edge of the welding surface and at least a portion of the side surface.

[0024] Thus, when the welding head moves relative to the electrode tab for welding, the local stress concentration caused by the edge of the welding surface to the electrode tab can be reduced by the open arc surface, thereby improving the problem of electrode tab cracking.

[0025] In some embodiments, the clearance arc surface is connected to the opposite ends of the welding surface along the width direction of the welding surface. In this way, when the welding head moves along the width direction of the welding surface and welds the electrode tab, local stress concentration of the electrode tab can be reduced, welding stability can be improved, thereby improving the problem of electrode tab cracking.

[0026] In some embodiments, the radius of the relief arc surface ranges from 1 mm to 2 mm. Setting the radius of the relief arc surface within this range can better reduce local stress concentration in the electrode tab and improve the problem of electrode tab cracking.

[0027] In some embodiments, the shape of the first weld portion includes at least one of a sphere, a square, and a rhombus. By setting the shape of the first weld portion, the first weld portion can make better contact with the surface of the electrode tab, resulting in a more stable weld to the electrode tab.

[0028] Secondly, this application also provides a welding apparatus, including a base and a welding head as described above, the welding head being disposed on the base.

[0029] Thirdly, this application also provides a battery production apparatus, including the welding apparatus described above.

[0030] The aforementioned welding head, welding device, and battery production equipment are respectively provided with a first welding area and a second welding area on the welding surface. The first welding area is provided with a first welding part, and the second welding area is provided with a second welding part. The second welding part is rotatably provided. In this way, the first welding part plays the main welding role on the tab, while the second welding part forms a rolling weld with the tab, which can reduce the local stress concentration of the tab, reduce the friction force on the tab, and improve the problem of tab cracking. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a welding head applied to electrode welding according to one or more embodiments.

[0032] Figure 2 This is a schematic diagram of the planar structure of a welding head according to one or more embodiments.

[0033] Figure 3 This is a three-dimensional structural schematic diagram of a welding head according to one or more embodiments.

[0034] Figure 4 This is a schematic diagram of the structure of the second welding zone in a welding head according to one or more embodiments.

[0035] Explanation of reference numerals in the attached drawings: 100, welding head; 200, electrode lug; 10, main body; 20, first welding part; 30, second welding part; 11, welding surface; 12, first welding area; 13, second welding area; 14, receiving cavity; 15, transition area; 16, side; 17, clearance arc surface; a, width direction; b, length direction. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0042] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0043] A battery device consists of one or more battery cells. For each battery device, the multiple battery cells that make up it can be connected in series, in parallel, or in a mixed configuration. Among them, a mixed configuration means that multiple battery cells are connected in both series and parallel.

[0044] A battery cell is the smallest unit that makes up a battery. The structure of a battery cell typically includes a casing and an electrode assembly housed inside the casing. The casing forms a closed, sealed cavity that houses and protects the electrode assembly. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs, and typically includes a positive electrode, a negative electrode, and a separator, which are stacked or wound together.

[0045] For an electrode assembly, the portion of the positive or negative electrode plate coated with active material constitutes the main body of the electrode assembly, while the portion of the positive or negative electrode plate not coated with active material constitutes the tab. Specifically, a positive tab is formed on the positive electrode plate, and a negative tab is formed on the negative electrode plate.

[0046] With the rapid development of new energy technologies, the performance requirements for individual battery cells are becoming increasingly stringent. Consequently, the number of layers in the electrode assembly, including the positive electrode, separator, and negative electrode, is increasing. This leads to an increase in the thickness of the electrode tabs.

[0047] Therefore, during ultrasonic welding of the electrode tabs, greater pressure needs to be applied to ensure the stability of the welding process. However, greater pressure leads to greater friction, which increases the probability of the electrode tabs cracking during welding.

[0048] Based on the above considerations, in order to solve the problem that the probability of electrode cracking during welding increases due to the gradual increase in the thickness of the electrode tab, one or more embodiments of this application provide a welding head with a first welding area and a second welding area respectively provided on the welding surface. The first welding area is provided with a first welding part, and the second welding area is provided with a second welding part. The second welding part is rotatably provided. In this way, the first welding part plays the main welding role for the electrode tab, while the second welding part forms a rolling weld with the electrode tab, which can reduce the local stress concentration of the electrode tab, reduce the friction force formed on the electrode tab, and improve the problem of electrode tab cracking.

[0049] Please refer to the following: Figure 1 , Figure 2 as well as Figure 3 One embodiment of this application provides a welding head 100 for welding electrode tabs 200. The welding head 100 includes a main body 10, a first welding portion 20, and a second welding portion 30. The main body 10 has a welding surface 11, on which independent first welding areas 12 and second welding areas 13 are formed. The first welding portion 20 protrudes and is fixedly disposed on the welding surface 11 of the first welding area 12, and the second welding portion 30 protrudes and is rotatably disposed on at least a portion of the welding surface 11 of the second welding area 13.

[0050] It should be noted that tab 200 refers to the tab of the electrode assembly, which is the main component in the battery cell where electrochemical reactions occur. A battery cell typically includes a casing and an electrode assembly. The casing has an internal cavity to house the electrode assembly and other functional components, providing good protection for these components. The casing includes a top cover and a casing body, which can be assembled or integrally formed.

[0051] Electrode assemblies are typically formed by stacking and winding positive electrode plates, separators, and negative electrode plates. The portion of the positive or negative electrode plate coated with active material constitutes the main body of the electrode assembly, while the portion of the positive or negative electrode plate not coated with active material constitutes the tab 200. Therefore, the tab 200 is actually formed by stacking multiple layers of positive or negative electrode plates.

[0052] When the welding head 100 performs ultrasonic welding on the tab 200, it usually applies a certain pressure to the tab 200 along the stacking direction of the tab 200. Under pressure and high-frequency vibration, atomic resonance is achieved on adjacent tabs 200, causing the surfaces of the stacked tabs 200 to rub against each other and form molecular layer fusion, so as to connect the multilayer tabs 200 and the tabs 200 to the adapter piece.

[0053] The main body 10 of the welding head 100 has a welding surface 11, which is a surface facing the electrode 200 during the welding process and capable of performing welding operations on the electrode 200. The welding surface 11 can be divided into a first welding area 12 and a second welding area 13 that are independent of each other. A first welding part 20 is provided in the first welding area 12. The first welding part 20 protrudes and is fixedly disposed on the welding surface 11 of the first welding area 12.

[0054] Understandably, the first welding part 20 can be configured as welding teeth, which play a major welding role on the electrode tab 200. If the contact area between the welding head 100 and the electrode tab 200 is too small, although the friction is reduced, it will affect the final welding effect. Therefore, by configuring the first welding part 20, the contact area between the welding head 100 and the electrode tab 200 and the welding effect can be guaranteed.

[0055] Furthermore, the second welding portion 30 protrudes and is rotatably disposed on at least a portion of the welding surface 11 of the second welding area 13. The second welding portion 30 may be distributed on all the welding surfaces 11 of the second welding area 13, or it may be distributed on a portion of the welding surfaces 11 of the second welding area 13, depending on the actual situation. In this case, corrosion teeth or other fixing welding teeth may be provided on the welding surfaces 11 of the other portion of the second welding area 13.

[0056] When the first welding part 20 contacts the electrode tab 200 and a certain pressure is applied, the second welding part 30 and the electrode tab 200 are in rolling contact. In this way, the contact between the second welding part 30 and the electrode tab 200 changes from surface contact to line contact, which can reduce the contact area between the welding head 100 and the electrode tab 200, thereby reducing the friction force on the electrode tab 200 and reducing the local stress concentration of the electrode tab 200, thus achieving the effect of improving the cracking of the electrode tab 200.

[0057] Thus, through the above structure, the first welding part 20 can play the main welding role on the tab 200. At the same time, the second welding part 30 forms a rolling weld with the tab 200, which can reduce the local stress concentration of the tab 200, reduce the friction force on the tab 200, and improve the problem of the tab 200 cracking.

[0058] In some embodiments, the second solder area 13 is disposed around the outer periphery of the first solder area 12.

[0059] Specifically, the first welding area 12 is centrally located on the welding surface 11, and the second welding area 13 is arranged around the outer periphery of the first welding area 12. In this way, when the first welding part 20 in the first welding area 12 applies pressure to weld the tab 200, the second welding parts 30 in the second welding area 13 are located around the outer periphery of the first welding part 20, which can make the pressure on the tab 200 more uniform.

[0060] Understandably, in some other embodiments, the second solder area 13 and the first solder area 12 can also be arranged adjacent to each other. That is, the first solder area 12 and the second solder area 13 can be arranged sequentially along the width direction a of the welding surface 11, or the first solder area 12 and the second solder area 13 can be arranged sequentially along the length direction b of the welding surface 11. Similarly, the friction force on the tab 200 can be reduced by the second welding part 30 in the second solder area 13, thereby improving the cracking effect of the tab 200.

[0061] With the above structure, when the first welding part 20 and the second welding part 30 work together to weld the tab 200, the pressure on different positions of the tab 200 can be made more uniform, thereby making the welding more stable.

[0062] In some embodiments, the ratio of the widths of the first weld area 12 and the second weld area 13 in the width direction a of the weld surface 11 ranges from 5:3 to 1:0.1.

[0063] Specifically, the range of the width ratio between the first welding area 12 and the second welding area 13 will affect the area size of the first welding area 12 and the second welding area 13, and the area size of the first welding area 12 and the second welding area 13 will affect the contact area between the welding head 100 and the electrode tab 200, thereby affecting the welding effect.

[0064] Based on this, the ratio of the widths of the first welding area 12 and the second welding area 13 is set within the above range. On the basis of ensuring a stable welding effect between the first welding part 20 and the tab 200 in the first welding area 12, the friction force on the tab 200 is reduced by the rolling contact between the second welding part 30 and the tab 200 in the second welding area 13, thereby improving the cracking of the tab 200.

[0065] Furthermore, in the width direction a of the welding surface 11, the ratio of the width between the first welding area 12 and the second welding area 13 is in the range of 5:2 to 5:1.

[0066] As a specific embodiment, in the width direction a of the welding surface 11, the ratio of the width between the first welding area 12 and the second welding area 13 can be, but is not limited to, set to 5:1, 5:1.2, 5:1.4, 5:1.6, 5:1.8, or 5:2.

[0067] Therefore, by setting the ratio of the widths of the first welding area 12 and the second welding area 13 within the above range, it is possible to further reduce the friction force on the electrode 200 and improve the cracking of the electrode 200 while ensuring a stable welding effect between the first welding part 20 and the electrode 200 in the first welding area 12.

[0068] In some embodiments, the ratio of the lengths of the first weld area 12 and the second weld area 13 along the length direction b of the weld surface 11 ranges from 5:2 to 10:1.

[0069] Specifically, the ratio of the lengths of the first welding area 12 to the second welding area 13 affects the size of the area of ​​the first welding area 12 and the second welding area 13, and the size of the area of ​​the first welding area 12 and the second welding area 13 affects the size of the contact area between the welding head 100 and the electrode tab 200, thereby affecting the welding effect.

[0070] Based on this, the ratio of the lengths between the first welding area 12 and the second welding area 13 is set within the above range. On the basis of ensuring a stable welding effect between the first welding part 20 and the electrode 200 in the first welding area 12, the friction force on the electrode 200 is reduced by the rolling contact between the second welding part 30 and the electrode 200 in the second welding area 13, thereby improving the cracking of the electrode 200.

[0071] Furthermore, along the length direction b of the welding surface 11, the ratio of the lengths between the first welding area 12 and the second welding area 13 ranges from 5:1 to 10:1.

[0072] As a specific embodiment, the ratio of the lengths of the first weld area 12 and the second weld area 13 along the length direction b of the welding surface 11 can be, but is not limited to, set to 10:1, 9:1, 8:1, 7:1, 6:1, or 5:1.

[0073] Therefore, by setting the ratio of the lengths between the first welding area 12 and the second welding area 13 within the above range, it is possible to further reduce the friction force on the electrode 200 and improve the cracking of the electrode 200 while ensuring a stable welding effect between the first welding part 20 and the electrode 200 in the first welding area 12.

[0074] like Figure 3 and Figure 4 As shown, in some embodiments, a plurality of spaced-apart receiving cavities 14 are provided on the welding surface 11 of the second welding area 13, and the second welding part 30 is constructed as a welding sphere, with at least one welding sphere movably disposed in each receiving cavity 14.

[0075] Specifically, the second welding part 30 is constructed as a welding sphere, that is, the second welding part 30 is configured as a spherical structure.

[0076] Furthermore, a plurality of spaced-apart receiving cavities 14 are provided on the welding surface 11 of the second welding zone 13. The shape of the receiving cavity 14 can be set as a spherical cavity that matches the welding sphere, and the welding sphere is placed in each receiving cavity 14 in a corresponding manner.

[0077] The opening diameter of the receiving cavity 14 is smaller than the diameter of the corresponding welded sphere. Thus, when the welded sphere is placed in the corresponding receiving cavity 14, a portion of the welded sphere can protrude from the welding surface 11 without completely falling out of the receiving cavity 14.

[0078] When welding the tab 200, the part of the welding ball protruding from the welding surface 11 can contact the surface of the tab 200. When pressure is applied to the tab 200, the welding ball can move up and down in the corresponding receiving cavity 14, thereby providing a certain buffering effect on the tab 200 and realizing flexible welding of the tab 200.

[0079] Thus, through the above structure, rolling contact can be achieved between the second welding part 30 and the tab 200, reducing the frictional force on the tab 200 and thereby improving the cracking of the tab 200. In addition, when pressure is applied to the tab 200, the welding ball can move up and down within the corresponding receiving cavity 14, thereby providing a certain buffering effect on the tab 200 and achieving flexible welding of the tab 200.

[0080] In some embodiments, in the direction perpendicular to the welding surface 11, the height H of the welding sphere protruding from the corresponding welding surface 11 is 1 / 5 to 3 / 5 of the diameter D of the welding sphere.

[0081] First, it should be noted that the height of the welded ball protruding from the corresponding weld surface 11 cannot exceed the height of the first weld portion 20 within the first weld area 12. Under this premise, the height of the welded ball protruding from the corresponding weld surface 11 will affect the buffering effect of the welded ball on the surface of the electrode 200 when pressure is applied to the electrode 200.

[0082] Specifically, the diameter of the welding sphere can be, but is not limited to, 0.3mm to 0.5mm. Based on this, the height of the welding sphere protruding from the corresponding welding surface 11 can be set to 1 / 5 to 3 / 5 of the diameter of the welding sphere, that is, the height of the welding sphere protruding from the corresponding welding surface 11 can be set between 0.06mm and 0.3mm.

[0083] The above structure can effectively improve the buffering effect of the welding ball on the surface of the electrode 200 when the welding head 100 applies pressure to the electrode 200.

[0084] In some embodiments, the outer peripheral surface of the welded sphere is configured as a smooth surface.

[0085] Specifically, the outer circumferential surface of the welding ball is set to a smooth surface. When the welding ball comes into contact with the tab 200, the friction force on the surface of the tab 200 can be further reduced, and the cracking of the tab 200 can be further improved.

[0086] Of course, the outer circumferential surface of the welded sphere can also be set as the corrosion surface. The specifics can be adjusted according to the actual application requirements, which will not be elaborated here.

[0087] In some embodiments, a transition region 15 is also formed on the welding surface 11. The transition region 15 is configured as a smooth surface and connects the first welding region 12 and the second welding region 13.

[0088] Specifically, the transition zone 15 can better connect the welding surfaces 11 between the first welding zone 12 and the second welding zone 13. Furthermore, by setting the transition zone 15 as a smooth surface, when the welding head 100 applies pressure to the tab 200, the smooth surface contacting the surface of the tab 200 can further reduce the friction force on the surface of the tab 200, and further improve the cracking of the tab 200.

[0089] In some embodiments, the main body 10 further has a side surface 16 and a clearance arc surface 17, the clearance arc surface 17 being connected between the outer peripheral edge of the welding surface 11 and at least a portion of the side surface 16.

[0090] Specifically, the welding surface 11 is typically set as the end face of the main body 10, while the side surface 16 is formed on the periphery of the main body 10. The clearance arc surface 17 connects the outer peripheral edge of the welding surface 11 and at least part of the side surface 16. When the welding head 100 moves relative to the electrode 200 for welding, the clearance arc surface 17 can reduce the local stress concentration caused by the edge of the welding surface 11 to the electrode 200, thereby improving the problem of electrode 200 cracking.

[0091] In some embodiments, the clearance arc surface 17 is connected to the opposite ends of the welding surface 11 along the width direction a of the welding surface 11.

[0092] Specifically, the clearance arc surface 17 is connected to the opposite ends of the welding surface 11 along the width direction a of the welding surface 11. When the welding head 100 moves along the width direction a of the welding surface 11 and welds the tab 200, it can reduce the local stress concentration of the tab 200, improve the welding stability, and thus improve the problem of the tab 200 cracking.

[0093] In some embodiments, the radius of the clearance arc surface 17 ranges from 1 mm to 2 mm.

[0094] As a specific embodiment, the radius of the clearance arc surface 17 can be set to, but is not limited to, 1mm, 1.5mm, or 2mm.

[0095] Specifically, the radius of the clearance arc surface 17 will affect the overall volume of the welding head 100 and the probability of the electrode 200 cracking when the welding head 100 presses down on the electrode 200.

[0096] Therefore, by setting the radius of the clearance arc surface 17 within the above range, the local stress concentration of the tab 200 can be better reduced, and the problem of the tab 200 cracking can be improved.

[0097] In some embodiments, the shape of the first weld portion 20 includes at least one of spherical, square, and rhomboid shapes.

[0098] Specifically, the first welding part 20 can be configured as a welding tooth, and the shape of the welding tooth can be, but is not limited to, spherical, square, rhomboid or other shapes. Of course, the shape of the welding tooth can also be a combination of the above tooth shapes.

[0099] In this way, by setting the shape of the first welding part 20, the first welding part 20 can make better contact with the surface of the electrode tab 200, and the electrode tab 200 can be welded more stably.

[0100] Based on the same concept as the welding head 100 described above, this application also provides a welding apparatus, including a base and the welding head 100 as described above, wherein the welding head 100 is disposed on the base.

[0101] Based on the same concept as the welding apparatus described above, this application also provides a battery production apparatus, including the welding apparatus described above.

[0102] According to one or more embodiments, in specific use, the welding head 100 is used to weld the tabs 200 of the electrode assembly. The welding surface 11 is brought into contact with the surface of the tab 200, and a certain pressure is applied to the tab 200. At this time, the first welding part 20 plays the main welding role on the tab 200, while the second welding part 30 makes rolling contact with the surface of the tab 200, which reduces the frictional force on the surface of the tab 200, thereby reducing local stress concentration on the tab 200 and improving the resistance to cracking.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A welding tip characterized by, For welding electrode tabs, the welding head includes: The main body has a welding surface, on which a first welding area and a second welding area are formed independently of each other; A first welding portion, protruding and fixedly disposed on the welding surface of the first welding area; and The second weld portion is protruding and rotatably disposed on the weld surface of at least a portion of the second weld area.

2. The welding tip of claim 1, wherein The second solder area is disposed around the outer periphery of the first solder area.

3. The welding tip according to claim 1 or 2, characterized in that In the width direction of the welding surface, the ratio of the width between the first welding area and the second welding area ranges from 5:3 to 1:0.

1.

4. The welding tip of claim 3, wherein In the width direction of the welding surface, the ratio of the width between the first welding area and the second welding area is in the range of 5:2 to 5:

1.

5. The welding tip of claim 1 or 2, wherein In the length direction of the welding surface, the ratio of the lengths of the first welding area to the second welding area ranges from 5:2 to 10:

1.

6. The welding tip of claim 5, wherein In the length direction of the welding surface, the ratio of the lengths of the first welding area to the second welding area ranges from 5:1 to 10:

1.

7. The welding tip of claim 1, wherein The welding surface of the second welding area is provided with a plurality of mutually spaced cavities, and the second welding part is constructed as a welding sphere, with at least one welding sphere movably disposed in each of the cavities.

8. The welding tip of claim 7, wherein In a direction perpendicular to the welding surface, the height by which the welding sphere protrudes from the corresponding welding surface is 1 / 5 to 3 / 5 of the diameter of the welding sphere.

9. The welding tip of claim 7, wherein The outer circumferential surface of the welded sphere is constructed to be a smooth surface.

10. The welding tip of claim 1, wherein A transition zone is also formed on the welding surface. The transition zone is constructed as a smooth surface and connects the first welding area and the second welding area.

11. The welding tip of claim 1, wherein The main body also has a side surface and a clearance arc surface, the clearance arc surface being connected between the outer peripheral edge of the welding surface and at least a portion of the side surface.

12. The welding tip of claim 11, wherein The clearance arc surface is connected to the opposite ends of the welding surface along the width direction of the welding surface.

13. The welding head according to claim 11, characterized in that, The radius of the free-spaced arc surface ranges from 1mm to 2mm.

14. The welding tip of claim 1, wherein The shape of the first welded part includes at least one of spherical, square, and rhomboid shapes.

15. A welding device characterized by It includes a base and a welding head as described in any one of claims 1-14, wherein the welding head is disposed on the base.

16. A battery production apparatus characterized by comprising: Includes the welding apparatus as described in claim 15.

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