Ultrasonic welding head, ultrasonic welding device and battery production system

Abstract

The utility model provides an ultrasonic welding head, an ultrasonic welding device and a battery production system.The ultrasonic welding head is used for conducting ultrasonic welding on a first to-be-welded part to a second to-be-welded part, a welding part comprises a main welding area and a pressure relief area, the pressure relief area is arranged on the periphery of the main welding area in a surrounding mode, and the surface of the pressure relief area is concaved inwards to form a groove; and the orientation of the notch of the groove is arranged along the orientation of the surface of the main welding area. According to the structure, when the welding part abuts against the first to-be-welded part to press the first to-be-welded part on the second to-be-welded part for welding, the groove can contain the extruded material of the first to-be-welded part, and the part, corresponding to the groove, of the first to-be-welded part is not pressed and can generate dislocation deformation to release the borne shear stress; the possibility of stress concentration is reduced, the possibility of breakage of the first to-be-welded part is reduced, and the ultrasonic welding quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to an ultrasonic welding head, an ultrasonic welding device and a battery production system. BACKGROUND

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] In the battery device, ultrasonic welding is widely used as a common connection method. Therefore, improving the quality of ultrasonic welding has a very important influence on improving the reliability of the battery device. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides an ultrasonic welding head, an ultrasonic welding device and a battery production system, which can improve the quality of ultrasonic welding.

[0005] In a first aspect, some embodiments of the present application provide an ultrasonic welding head for ultrasonic welding of a first to-be-welded component on a second to-be-welded component, the ultrasonic welding head comprising a welding portion for abutting the first to-be-welded component, the welding portion comprising a main welding area and a pressure relief area, the pressure relief area being arranged around the outer periphery of the main welding area, the surface of the pressure relief area being recessed inward to form a groove, and the direction of the groove mouth being arranged along the direction of the surface of the main welding area.

[0006] In the above structure, when the welding portion abuts the first to-be-welded component to press the first to-be-welded component on the second to-be-welded component for welding, the groove can accommodate the material extruded by the first to-be-welded component, the corresponding part of the first to-be-welded component is not pressed by the groove, and the first to-be-welded component can be deformed to release the shear stress, thereby reducing the possibility of stress concentration and the possibility of breakage of the first to-be-welded component, and improving the quality of ultrasonic welding.

[0007] According to the ultrasonic welding head provided by some embodiments of the present application, the groove bottom is provided with a first welding tooth protruding from the groove mouth.

[0008] According to the ultrasonic welding head provided by some embodiments of the present application, along the direction of the surface of the main welding area, the height of the first welding tooth is H1, and the depth of the groove is S1, S1 = K x H1, and 0.15 ≤ K ≤ 0.85.

[0009] According to the ultrasonic welding head provided by some embodiments of the present application, along the direction of the surface of the main welding area, the cross-sectional area of the first welding tooth decreases.

[0010] According to the ultrasonic welding horn provided by some embodiments of the present application, the first welding tooth is configured in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

[0011] According to the ultrasonic welding horn provided by some embodiments of the present application, the second welding tooth is configured in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

[0012] According to the ultrasonic welding horn provided by some embodiments of the present application, the second welding tooth is configured in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

[0013] According to the ultrasonic welding horn provided by some embodiments of the present application, the second welding tooth is configured in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

[0014] According to the ultrasonic welding horn provided by some embodiments of the present application, the pressure relief area is located on the side of the surface of the main welding area in the opposite direction of its own direction.

[0015] According to the ultrasonic welding horn provided by some embodiments of the present application, the surface of the pressure relief area is configured as an inclined surface, which is away from the surface of the main welding area in the opposite direction of the direction of the surface of the main welding area in the radial direction of the main welding area.

[0016] According to the ultrasonic welding horn provided by some embodiments of the present application, the ultrasonic welding horn further comprises a main body part connected to the pressure relief area, a fillet structure is arranged at the connection between the main body part and the pressure relief area, and the groove is in communication with the surface of the fillet structure.

[0017] According to the ultrasonic welding horn provided by some embodiments of the present application, the radius of the fillet structure is R, and 0.3mm≤R≤2mm.

[0018] According to the ultrasonic welding horn provided by some embodiments of the present application, the welding part is provided with a separation groove, which is arranged around the outer periphery of the main welding area and located between the main welding area and the pressure relief area.

[0019] According to the ultrasonic welding horn provided by some embodiments of the present application, the separation groove is in communication with the groove.

[0020] According to the ultrasonic welding horn provided by some embodiments of the present application, the width of the groove is L1 along the circumferential direction of the main welding area, and L1=T×H1, 2≤T≤3.5.

[0021] According to the ultrasonic welding horn provided by some embodiments of the present application, the groove is provided with at least two, which are arranged at intervals along the circumferential direction of the main welding area.

[0022] According to the ultrasonic welding horn provided by some embodiments of the present application, the interval size between the adjacent two grooves is L2 along the circumferential direction of the main welding area, and L2=W×L1, 0.15≤W≤1.

[0023] According to the ultrasonic welding head provided by some embodiments of the present application, the pressure relief area includes a curved area and two straight areas, the two straight areas are oppositely arranged on two sides of the main welding area, the curved area is connected between the two straight areas, and the groove is arranged in the straight area.

[0024] In the second aspect, some embodiments of the present application provide an ultrasonic welding device, which includes an ultrasonic generator, an ultrasonic transducer and the ultrasonic welding head provided by any of the technical solutions described above, the ultrasonic transducer is connected between the ultrasonic generator and the ultrasonic welding head, and the main welding area of the ultrasonic welding head is used to weld the tab in the battery monomer against the adapter piece.

[0025] In the third aspect, some embodiments of the present application provide a battery production system, which includes the ultrasonic welding device provided by the technical solutions described above.

[0026] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0027] The present application provides an ultrasonic welding head for ultrasonic welding of a first to-be-welded component on a second to-be-welded component, the ultrasonic welding head includes a welding part for abutting against the first to-be-welded component, the welding part includes a main welding area and a pressure relief area, the pressure relief area is arranged around the outer periphery of the main welding area, the surface of the pressure relief area is recessed inward to form a groove, and the direction of the groove opening is arranged along the direction of the surface of the main welding area. In the above structure, when the welding part abuts against the first to-be-welded component to press the first to-be-welded component on the second to-be-welded component for welding, the groove can accommodate the material extruded by the first to-be-welded component, the corresponding part of the first to-be-welded component is not pressed, and the deformation of the first to-be-welded component can be released to reduce the possibility of stress concentration and the possibility of breaking of the first to-be-welded component, which is beneficial to improve the quality of ultrasonic welding.

[0028] The above description is only a summary of the technical solutions of the present application, in order to enable one of ordinary skill in the art to better understand the technical means of the present application and to implement it according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in different drawings represent the same or similar components.

[0030] Figure 1A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application when welding;

[0031] Figure 2 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective;

[0032] Figure 3 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective; Figure 2 An enlarged view of A in FIG. 1;

[0033] Figure 4 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective;

[0034] Figure 5 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective; Figure 4 An enlarged view of B in FIG. 1;

[0035] Figure 6 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective;

[0036] Figure 7 A structure schematic diagram of the ultrasonic welding head provided by some embodiments of the present application from another perspective; Figure 6 An enlarged view of C in FIG. 1.

[0037] In the drawings: 1, welding part; 11, main welding area; 111, second welding tooth; 12, pressure relief area; 121, groove; 122, first welding tooth; 123, bending area; 124, straight area; 13, separation groove; 2, main body part; 3, round corner structure; 100, electrode assembly; 200, tab; 300, adapter piece; 400, ultrasonic welding head. DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0041] In addition, the technical terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0044] The battery device has the advantages of high specific energy, high power density, etc., and is widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools, etc.

[0045] The battery device mentioned in the embodiments of the present application includes a plurality of battery modules, and the battery module refers to a single physical module including one or more battery monomers to provide higher voltage and capacity.

[0046] The battery cell can be a secondary battery cell, which refers to a battery cell that can be used continuously by activating active materials through charging after the battery cell is discharged.

[0047] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, or the like.

[0048] The battery cell generally includes an electrode assembly, an electrolyte, and a case. The electrode assembly includes a cathode, an anode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the cathode and the anode. The separator is disposed between the cathode and the anode, and can function to prevent short circuiting of the cathode and the anode while allowing the active ions to pass through. The case is used to encapsulate the electrode assembly and the electrolyte and the like. The case can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, or the like. The case includes a case body and an end cover. The case body forms an accommodation space having an opening, and the accommodation space is used to accommodate the electrode assembly and the electrolyte and the like. The end cover is coupled to the opening of the accommodation space and is sealingly connected to the case body.

[0049] The electrode assembly is provided with a tab, and the tab can guide current from the electrode assembly to an electrode terminal on the end cover.

[0050] In the related art, in order to stably connect the multi-layer tab in the electrode assembly to the electrode terminal, a scheme of first welding the multi-layer tab to a relay tab and then connecting the relay tab to the electrode terminal is generally used. Since ultrasonic welding is a method of transmitting high-frequency vibration waves to the surfaces of two objects to be welded, and causing the surfaces of the two objects to rub against each other under pressure to form a fusion between the molecular layers, it has the advantages of high efficiency, high quality, aesthetics, energy saving, and high welding strength, and in some cases ultrasonic welding is used for welding the tab and the relay tab. The tab and the relay tab adopt a lap joint structure. During welding, the ultrasonic welding head is pressed on the superimposed tab and a certain pressure is applied, so that the multi-layer tab is pressed on the relay tab. Then, the ultrasonic welding device outputs ultrasonic waves, and under high-frequency vibration, atomic resonance on adjacent tabs is achieved, and the multi-layer tab and the tab and the relay tab are connected together.

[0051] However, since the thickness of the single-layer tab is relatively thin, the tab is often vibrated and cracked during ultrasonic welding, which not only affects the welding quality, but also may generate metal debris, thereby affecting the quality of the battery cell.

[0052] In order to improve the quality of ultrasonic welding, some embodiments of the present application provide an ultrasonic welding head for ultrasonic welding of a first to-be-welded component on a second to-be-welded component, the ultrasonic welding head comprising a welding portion for abutting against the first to-be-welded component, the welding portion comprising a main welding area and a pressure relief area, the pressure relief area being arranged around the outer periphery of the main welding area, the surface of the pressure relief area being recessed inward to form a groove, and the direction of the groove mouth being arranged along the direction of the surface of the main welding area. In the above structure, when the welding portion abuts against the first to-be-welded component to press the first to-be-welded component on the second to-be-welded component for welding, the groove can accommodate the material extruded by the first to-be-welded component, the corresponding part of the first to-be-welded component is not pressed, and the first to-be-welded component can be deformed to release the shear stress, thereby reducing the possibility of stress concentration and the possibility of breakage of the first to-be-welded component, and the quality of ultrasonic welding is improved.

[0053] The ultrasonic welding head disclosed in the embodiments of the present application can be used in an ultrasonic welding device, which can reduce the possibility of breakage of the first to-be-welded component during welding, and improve the quality of ultrasonic welding.

[0054] The ultrasonic welding device disclosed in the embodiments of the present application can be used in a production system of a battery device, and can also be used in the production of vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0055] The ultrasonic welding head, the ultrasonic welding device and the battery production system provided by the embodiments of the present application will be further described below in conjunction with the drawings and specific embodiments.

[0056] Some embodiments of the present application provide an ultrasonic welding head 400 for ultrasonic welding of a first to-be-welded component on a second to-be-welded component, referring to Figures 1 to 3 the ultrasonic welding head 400 comprising a welding portion 1 for abutting against the first to-be-welded component, the welding portion 1 comprising a main welding area 11 and a pressure relief area 12, the pressure relief area 12 being arranged around the outer periphery of the main welding area 11, the surface of the pressure relief area 12 being recessed inward to form a groove 121, and the direction of the groove mouth being arranged along the direction of the surface of the main welding area 11.

[0057] The ultrasonic welding head, as a component for ultrasonic welding of a first to-be-welded component to a second to-be-welded component, plays a very important role in ultrasonic welding. The welding portion 1 can be a part of the ultrasonic welding head 400 for direct contact with the first to-be-welded component, which is used to press the first to-be-welded component on the second to-be-welded component and weld the first to-be-welded component to the second to-be-welded component.

[0058] The main welding area 11 and the pressure relief area 12 are two areas in the welding portion 1, wherein the main welding area 11 is the main welding area in the welding portion 1, and the main welding area 11 is located in the middle area of the welding portion 1, and the pressure relief area 12 is an area arranged around the main welding area 11, and the pressure relief area 12 is used to release the shear stress suffered by the first to-be-welded component.

[0059] The groove 121 can be a groove-shaped structure arranged on the pressure relief area 12. By forming the groove 121 on the surface of the pressure relief area 12 by inwardly recessing, and arranging the groove 121 so that the groove opening is arranged along the direction of the surface of the main welding area 11, when the first to-be-welded component is pressed on the second to-be-welded component, the surface of the main welding area 11 and the surface of the pressure relief area 12, the groove 121 can not only accommodate the material extruded by the first to-be-welded component, but also make the corresponding part of the first to-be-welded component not be pressed, and can be deformed to release the shear stress suffered.

[0060] The welding portion 1 is used to abut the first to-be-welded component, which can be that the main welding area 11 and the pressure relief area 12 press the first to-be-welded component on the second to-be-welded component, which can be that the surface of the main welding area 11 and the surface of the pressure relief area 12 are used to press the first to-be-welded component, and apply pressure to the first to-be-welded component, and press the first to-be-welded component on the second to-be-welded component to weld the first to-be-welded component and the second to-be-welded component.

[0061] Exemplarily, the first to-be-welded component can be a multi-layered tab 200 arranged in a stack, the tab 200 is led out from the electrode assembly 100, and the second to-be-welded component can be a jumper 300. The main welding area 11 and the pressure relief area 12 are used to press the first to-be-welded component on the second to-be-welded component, which can mean that the main welding area 11 and the pressure relief area 12 are used to press the first to-be-welded component on the second to-be-welded component, and the main welding area 11 and the pressure relief area 12 are used to press the multi-layered tab 200 arranged in a stack on the jumper 300.

[0062] In the above structure, when the welding portion 1 is used to press the first to-be-welded part against the second to-be-welded part to perform welding, the recess 121 can accommodate the material extruded by the first to-be-welded part, the corresponding part of the first to-be-welded part is not pressed, and can be deformed to release the shear stress, thereby reducing the possibility of stress concentration and the possibility of the first to-be-welded part being broken, and being conducive to improving the quality of ultrasonic welding.

[0063] In some embodiments, with reference to Figure 4 and Figure 5 The groove bottom of the recess 121 is provided with a first welding tooth 122 protruding from the groove opening of the recess 121.

[0064] The first welding tooth 122 can be a structure protruding from the groove bottom of the recess 121, which is used to pre-press and shape the first to-be-welded part before welding. The first welding tooth 122 protruding from the groove opening of the recess 121 can mean that the first welding tooth 122 protruding from the groove bottom of the recess 121 extends along the surface of the main welding area 11 in the direction and protrudes from the groove opening of the recess 121, so that the first welding tooth 122 can pre-press and shape the first to-be-welded part when the welding portion 1 presses the first to-be-welded part against the second to-be-welded part.

[0065] In some embodiments, in the direction of the surface of the main welding area 11, the height of the first welding tooth 122 is H1, the depth of the recess 121 is S1, S1=K×H1, and 0.15≤K≤0.85.

[0066] By setting the relationship between the height H1 of the first welding tooth 122 in the direction of the surface of the main welding area 11 and the depth S1 of the recess 121 in the direction of the surface of the main welding area 11 as S1=K×H1, 0.15≤K≤0.85, not only does the part of the first welding tooth 122 protruding from the groove opening of the recess 121 have sufficient height to pre-press and shape the first to-be-welded part, but also the first welding tooth 122 is less likely to press the first to-be-welded part too early, reducing the possibility of the first to-be-welded part being clamped too early by the first welding tooth 122 and the second to-be-welded part. Exemplarily, K can be 0.15, 0.2, 0.4, 0.6, or 0.85 to set the depth S1 of the recess 121 in the direction of the surface of the main welding area 11 reasonably.

[0067] In some embodiments, K can also be set to a range of 0.2≤K≤0.8. Exemplarily, the relationship between the height H1 of the first welding tooth 122 in the direction of the surface of the main welding area 11 and the depth S1 of the groove 121 in the direction of the surface of the main welding area 11 can be set to S1=0.3×H1, S1=0.5×H1 or S1=0.5×H1, not only making the part of the first welding tooth 122 protruding from the slot of the groove 121 have sufficient height to pre-press and shape the first to-be-welded part, but also making the first welding tooth 122 less likely to press the first to-be-welded part too early, reducing the possibility of the first to-be-welded part being clamped by the first welding tooth 122 and the second to-be-welded part too early.

[0068] In some embodiments, the cross-sectional area of the first welding tooth 122 in the direction of the surface of the main welding area 11 decreases.

[0069] The cross-sectional area of the first welding tooth 122 in the direction of the surface of the main welding area 11 decreasing can mean that the area of the cross section of the first welding tooth 122 perpendicular to the direction of the surface of the main welding area 11 decreases in the direction of the surface of the main welding area 11. Exemplarily, the cross-sectional area of the first welding tooth 122 can gradually decrease in the direction of the surface of the main welding area 11, and the cross-sectional area of the first welding tooth 122 can continuously change. Alternatively, the first welding tooth 122 can be divided into at least two segments in the direction of the surface of the main welding area 11, and the cross-sectional area of the segment far from the surface of the main welding area 11 can be smaller than the cross-sectional area of the segment close to the surface of the main welding area 11.

[0070] By setting the cross-sectional area of the first welding tooth 122 to decrease in the direction of the surface of the main welding area 11, the end surface of the first welding tooth 122 far from the surface of the main welding area 11 can reduce the contact friction area between the first welding tooth 122 and the first to-be-welded part, so that the friction area between the pressure relief area 12 and the first to-be-welded part changes from large surface friction to local surface friction, thereby reducing the thinning effect of the high-frequency vibration friction of the ultrasonic welding head 400 on the first to-be-welded part, which is conducive to improving the cracking phenomenon of the first to-be-welded part and improving the welding quality of ultrasonic welding.

[0071] In some embodiments, the first welding tooth 122 is configured in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

[0072] By configuring the first welding tooth 122 in a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure, the cross-sectional area of the first welding tooth 122 continuously decreases in the direction of the surface of the main welding area 11.

[0073] Exemplarily, the plurality of first welding teeth 122 arranged on the pressure relief area 12 can also be configured as first welding teeth 122 with hemispherical structures and first welding teeth 122 with circular table structures; or as first welding teeth 122 with hemispherical structures and first welding teeth 122 with prismatic table structures; or as first welding teeth 122 with circular table structures and first welding teeth 122 with prismatic table structures.

[0074] In some embodiments, the surface of the main welding area 11 is convexly provided with second welding teeth 111, and the cross-sectional area of the second welding teeth 111 decreases along the direction of the surface of the main welding area 11.

[0075] The second welding teeth 111 can be a structure convexly provided on the surface of the main welding area 11, which is used to reduce the contact area of the main welding area 11 and the first welding component. The cross-sectional area of the second welding teeth 111 decreases along the direction of the surface of the main welding area 11, which can mean that the cross-sectional area of the second welding teeth 111 perpendicular to the direction of the surface of the main welding area 11 decreases along the direction of the surface of the main welding area 11. Exemplarily, the cross-sectional area of the second welding teeth 111 can gradually decrease along the direction of the surface of the main welding area 11, and the cross-sectional area of the second welding teeth 111 continuously changes; or the second welding teeth 111 can be divided into at least two segments along the direction of the surface of the main welding area 11, and the cross-sectional area of the segment far from the surface of the main welding area 11 is smaller than that of the segment close to the surface of the main welding area 11.

[0076] By arranging the cross-sectional area of the second welding teeth 111 to decrease along the direction of the surface of the main welding area 11, the end surface of the second welding teeth 111 far from the surface of the main welding area 11 can reduce the contact friction area of the second welding teeth 111 and the first welding component, so that the friction area of the main welding area 11 and the first welding component changes from large surface friction to local surface friction, thereby reducing the thinning effect of the high-frequency vibration friction of the ultrasonic welding head 400 on the first welding component, which is beneficial to improve the cracking phenomenon of the first welding component and improve the welding quality of ultrasonic welding.

[0077] In some embodiments, the height of the second welding teeth 111 along the direction of the surface of the main welding area 11 is H2, H1 = Q x H2, and 0.15 ≤ Q ≤ 0.85.

[0078] By setting the height of the second welding tooth 111 in the direction of the surface of the main welding area 11 as H2, and setting the relationship between the height H2 of the second welding tooth 111 in the direction of the surface of the main welding area 11 and the height H1 of the first welding tooth 122 in the direction of the surface of the main welding area 11 as H1 = Q x H2, 0.15 ≤ Q ≤ 0.85, not only does the second welding tooth 111 protrude from the first welding tooth 122 by a sufficient height to pre-press and shape the first to-be-welded part, but also the second welding tooth 111 is less likely to affect the contact between the second welding tooth 111 and the first to-be-welded part due to the second welding tooth 111 protruding from the first welding tooth 122 by too much height. Exemplarily, Q can be 0.15, 0.2, 0.4, 0.6, or 0.85, so that the height H1 of the first welding tooth 122 in the direction of the surface of the main welding area 11 is set reasonably.

[0079] In some embodiments, the range of Q can also be set as 0.2 ≤ Q ≤ 0.8. Exemplarily, the relationship between the height H2 of the second welding tooth 111 in the direction of the surface of the main welding area 11 and the height H1 of the first welding tooth 122 in the direction of the surface of the main welding area 11 can be set as H1 = 0.3 x H2, H1 = 0.5 x H2, or H1 = 0.5 x H2, not only does the second welding tooth 111 protrude from the first welding tooth 122 by a sufficient height to pre-press and shape the first to-be-welded part, but also the second welding tooth 111 is less likely to affect the contact between the second welding tooth 111 and the first to-be-welded part due to the second welding tooth 111 protruding from the first welding tooth 122 by too much height.

[0080] In some embodiments, the second welding tooth 111 is configured as a semi-spherical structure, a circular truncated cone structure, or a prismatic truncated cone structure.

[0081] By configuring the second welding tooth 111 as a semi-spherical structure, a circular truncated cone structure, or a prismatic truncated cone structure, the cross-sectional area of the second welding tooth 111 continuously decreases in the direction of the surface of the main welding area 11.

[0082] Exemplarily, the plurality of second welding teeth 111 arranged on the main welding area 11 can also be configured as both second welding teeth 111 with a semi-spherical structure and second welding teeth 111 with a circular truncated cone structure; or both second welding teeth 111 with a semi-spherical structure and second welding teeth 111 with a prismatic truncated cone structure; or both second welding teeth 111 with a circular truncated cone structure and second welding teeth 111 with a prismatic truncated cone structure.

[0083] In some embodiments, the pressure relief area 12 is located on the side of the surface of the main welding area 11 in the opposite direction of its own direction.

[0084] By setting the pressure relief area 12 on the side opposite to the surface of the main welding area 11 in the direction of its own orientation, the main welding area 11 can be in contact with the first to-be-welded part before the pressure relief area 12 in the process of pressing the first to-be-welded part to the second to-be-welded part, so that the main welding area of the welding part 1 can preferentially press the first to-be-welded part.

[0085] In some embodiments, the surface of the pressure relief area 12 is configured as a slope, which is away from the surface of the main welding area 11 in the direction opposite to the orientation of the surface of the main welding area 11 in the radial direction of the main welding area 11.

[0086] The slope can refer to a surface with a certain inclination angle. By configuring the surface of the pressure relief area 12 as a slope, and making the slope away from the surface of the main welding area 11 in the direction opposite to the orientation of the surface of the main welding area 11 in the radial direction of the main welding area 11, the outer peripheral edge of the slope is farther away from the surface of the main welding area 11 than the inner peripheral edge, so that the slope can gently guide the first to-be-welded part extending between the welding part 1 and the second to-be-welded part, which is conducive to reducing the possibility of concentrated force on the first to-be-welded part 1 and improving the welding quality.

[0087] In some embodiments, referring to Figure 6 and Figure 7 , the ultrasonic welding head 400 further comprises a main body part 2 connected to the pressure relief area 12, and a fillet structure 3 is arranged at the connection between the main body part 2 and the pressure relief area 12, and the groove 121 is in communication with the surface of the fillet structure 3.

[0088] The main body part 2 can be the main structure in the ultrasonic welding head 400, which does not directly contact the first to-be-welded part and the second to-be-welded part. By connecting the main body part 2 to the pressure relief area 12, the main body part 2 and the welding area are connected to form an integral structure.

[0089] By arranging the fillet structure 3 at the connection between the main body part 2 and the pressure relief area 12, the surface of the pressure relief area 12 and the surface of the main body part 2 are gently transitioned, which reduces the possibility of concentrated force on the first to-be-welded part 1 and reduces the possibility of breakage of the first to-be-welded part 1.

[0090] The groove 121 is in communication with the surface of the fillet structure 3, which can be that the slope is connected with the surface of the fillet structure 3, and the groove 121 extends outward in the radial direction of the main welding area 11, so that the groove 121 is in communication with the surface of the fillet structure 3, so that the groove 121 can extend outward in the radial direction of the main welding area 11 to the surface of the fillet structure 3, so that the groove 121 can effectively release the shear stress on the first to-be-welded part.

[0091] In some embodiments, the radius of the fillet structure 3 is R, and 0.3mm≤R≤2mm.

[0092] By setting the range of the radius R of the rounded structure 3 as 0.3mm≤R≤2mm, not only can the rounded structure 3 make the surface of the pressure relief area 12 and the main body 2 transition smoothly, but also the rounded structure 3 is not easy to occupy too much of the pressure relief area 12 due to the radius being too large, so that the pressure relief area 12 has enough surface to press the first component to be welded.

[0093] The range of the radius R of the rounded structure 3 can be set as 0.5mm≤R≤1.5mm. Exemplarily, the radius R of the rounded structure 3 can be set as 0.8mm, 1mm or 1.2mm, not only can the rounded structure 3 make the surface of the pressure relief area 12 and the main body 2 transition smoothly, but also the rounded structure 3 is not easy to occupy too much of the pressure relief area 12 due to the radius being too large, so that the pressure relief area 12 has enough surface to press the first component to be welded.

[0094] In some embodiments, the welding part 1 is provided with a separation groove 13, which is arranged around the outer periphery of the main welding area 11 and between the main welding area 11 and the pressure relief area 12.

[0095] The separation groove 13 can be a groove-shaped structure provided on the welding part 1. The groove opening of the separation groove 13 is arranged in the same direction as the groove opening of the groove 121, and the separation groove 13 is arranged around the outer periphery of the main welding area 11 and between the main welding area 11 and the pressure relief area 12, so that the separation groove 13 can separate the surface of the pressure relief area 12 and the surface of the main welding area 11, and can accommodate the material extruded by the first component to be welded, so that the welding area of the first component to be welded forms an annular reinforcing rib, which can enhance the toughness of the first component to be welded and is beneficial to reduce the risk of the first component to be welded breaking.

[0096] In some embodiments, the separation groove 13 is communicated with the groove 121.

[0097] By communicating the separation groove 13 with the groove 121, the separation groove 13 can be continuously machined by machining processes such as milling, which is beneficial to reduce the machining difficulty of the groove 121 and the separation groove 13.

[0098] Exemplarily, the separation groove 13 and the groove 121 can also be made synchronously by integral machining processes such as casting together with the welding part 1.

[0099] Exemplarily, with reference to Figure 5 , along the circumference of the main welding area 11, the width of the groove 121 is set as L1, L1=T×H1, 2≤T≤3.5.

[0100] By setting the range of the width L1 of the groove 121 in the circumferential direction of the main welding area 11 as L1=T×H1, 2≤T≤3.5, the groove 121 has a proper width, not only making the width of the groove 121 not too small to affect the release of the shear stress, but also making the width of the groove 121 not too large to affect the structural strength of the pressure relief area 12. Exemplarily, T can be 2, 2.5, 3 or 3.5, so that the width of the groove 121 is set reasonably.

[0101] In some embodiments, the range of T can also be set as 2.2≤T≤3. Exemplarily, the width L1 of the groove 121 in the circumferential direction of the main welding area 11 can be set as L1=2.3×H1, L1=2.5×H1 or L1=2.8×H1, so that the groove 121 has a proper width, not only making the width of the groove 121 not too small to affect the release of the shear stress, but also making the width of the groove 121 not too large to affect the structural strength of the pressure relief area 12.

[0102] In some embodiments, the groove 121 is provided with at least two, which are arranged in the circumferential direction of the main welding area 11 and are spaced apart.

[0103] By arranging at least two grooves 121 in the circumferential direction of the main welding area 11 and spacing them apart on the pressure relief area 12, the at least two grooves 121 can effectively release the shear stress on the first welding component.

[0104] Exemplarily, the at least two grooves 121 are arranged equidistantly in the circumferential direction of the main welding area 11, so that the shear stress on the corresponding first welding component of the pressure relief area 12 can be uniformly released.

[0105] In some embodiments, with reference to Figure 5 , the spacing between the adjacent two grooves 121 in the circumferential direction of the main welding area 11 is L2, L2=W×L1, 0.15≤W≤1.

[0106] By setting the range of the spacing L2 between the adjacent two grooves 121 in the circumferential direction of the main welding area 11 as L2=W×L1, 0.15≤W≤1, not only can the at least two grooves 121 be arranged closely enough to effectively release the shear stress on the first welding component, but also the at least two grooves 121 are not too small to affect the structural strength of the pressure relief area 12. Exemplarily, W can be 0.15, 0.3, 0.5, 0.8 or 1, so that the spacing between the adjacent two grooves 121 in the circumferential direction of the main welding area 11 is set reasonably.

[0107] In some embodiments, the range of W can also be set as 0.2≤W≤0.8. Exemplarily, the relationship between the size L2 of the interval between two adjacent grooves 121 in the circumferential direction of the main welding area 11 and the width L1 of the groove 121 in the circumferential direction of the main welding area 11 can be set as L2=0.3×L1, L2=0.5×L1 or L2=0.7×L1, so that the at least two grooves 121 are arranged closely enough to effectively release the shear stress on the first to-be-welded component, and the at least two grooves 121 are not too small to affect the structural strength of the pressure relief area 12.

[0108] In some embodiments, the pressure relief area 12 includes a curved area 123 and two straight areas 124, the two straight areas 124 are oppositely arranged on two sides of the main welding area 11, the curved area 123 is connected between the two straight areas 124, and the groove 121 is arranged in the straight area 124.

[0109] The curved area 123 and the straight area 124 are different areas in the pressure relief area 12, wherein the curved area 123 is a curvedly extended area, and the straight area 124 is a straightly extended area. There are two straight areas 124 and two curved areas 123, the two straight areas 124 are oppositely arranged on two sides of the main welding area 11, the two curved areas 123 are oppositely arranged on two sides of the main welding area 11, and the curved area 123 is connected between the two straight areas 124, so that the curved area 123 and the straight area 124 are connected end to end to form an elliptical pressure relief area 12.

[0110] Exemplarily, the surface of the main welding area 11 can be configured as a rectangle in the pressure relief area 12, the long side of the rectangle is adjacent to the straight area 124, and the wide side is adjacent to the curved area 123.

[0111] Some embodiments of the present application also provide an ultrasonic welding device, which includes an ultrasonic generator, an ultrasonic transducer and the ultrasonic welding head 400 provided by any of the technical solutions described above, the ultrasonic transducer is connected between the ultrasonic generator and the ultrasonic welding head, and the main welding area 11 of the ultrasonic welding head 400 is used to weld the tab 200 in the battery monomer against the adapter piece 300.

[0112] Since the ultrasonic welding device includes the ultrasonic welding head 400 provided by any of the technical solutions described above, the ultrasonic welding device has better welding quality when welding the tab 200 on the adapter piece 300.

[0113] Some embodiments of the present application also provide a battery production system, which includes the ultrasonic welding device provided by any of the technical solutions described above.

[0114] Some embodiments of the present application provide an ultrasonic welding head 400, which is described with reference to Figure 7The ultrasonic welding head 400 comprises a welding part 1 and a main part 2, the welding part 1 comprises a main welding area 11 and a pressure relief area 12, the welding part 1 is provided with a separation groove 13 around the outer periphery of the main welding area 11 to separate the main welding area 11 and the pressure relief area 12, the surface of the pressure relief area 12 is inwardly recessed to form a notch along the surface of the main welding area 11 to be arranged towards the recessed groove 121, the groove bottom of the recessed groove 121 is provided with a first welding tooth 122, the surface of the main welding area 11 is provided with a second welding tooth 111, along the surface of the main welding area 11, the cross-sectional area of the first welding tooth 122 and the cross-sectional area of the second welding tooth 111 are continuously reduced.

[0115] In the above structure, when the first to-be-welded part is pressed against the second to-be-welded part for welding, the recessed groove 121 can accommodate the material extruded by the first to-be-welded part, the corresponding part of the first to-be-welded part is not pressed, and the shear stress can be released by the dislocation deformation to reduce the possibility of stress concentration and the possibility of the first to-be-welded part being broken, which is beneficial to improve the quality of ultrasonic welding.

[0116] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ultrasonic horn characterized by, An ultrasonic welding head for ultrasonic welding a first component to be welded to a second component to be welded, the ultrasonic welding head comprising: a welding portion for abutting the first component to be welded, the welding portion comprising a main welding area and a pressure relief area, the pressure relief area being arranged around the periphery of the main welding area, a surface of the pressure relief area being recessed inwardly to form a groove, an opening of the groove being arranged in the direction of the surface of the main welding area.

2. The ultrasonic horn of claim 1, wherein a first welding tooth protruding from the opening of the groove.

3. The ultrasonic horn of claim 2, wherein, In the direction of the surface of the main welding area, a height of the first welding tooth is H1, a depth of the groove is S1, S1=K×H1, 0.15≤K≤0.

85.

4. The ultrasonic horn of claim 2, wherein, In the direction of the surface of the main welding area, a cross-sectional area of the first welding tooth decreases.

5. The ultrasonic horn of claim 4, wherein, The first welding tooth is configured as a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

6. The ultrasonic horn of claim 2, wherein, a second welding tooth protruding from the surface of the main welding area, in the direction of the surface of the main welding area, a cross-sectional area of the second welding tooth decreases.

7. The ultrasonic horn of claim 6, wherein, In the direction of the surface of the main welding area, a height of the second welding tooth is H2, H1=Q×H2, 0.15≤Q≤0.

85.

8. The ultrasonic horn of claim 6, wherein, The second welding tooth is configured as a hemispherical structure, a circular truncated cone structure or a prismatic truncated cone structure.

9. The ultrasonic horn of claim 1, wherein, The pressure relief area is located on a side of the surface of the main welding area in the opposite direction of the direction of the surface of the main welding area.

10. The ultrasonic horn of claim 9, wherein, The surface of the pressure relief area is configured as an inclined surface, in the radial direction of the main welding area, the inclined surface is away from the surface of the main welding area in the opposite direction of the direction of the surface of the main welding area.

11. The ultrasonic horn of claim 1, wherein, The ultrasonic welding head further comprises a main body portion connected to the pressure relief area, a fillet structure is arranged at the connection between the main body portion and the pressure relief area, the groove is in communication with the surface of the fillet structure.

12. The ultrasonic horn of claim 11, wherein, A radius of the fillet structure is R, 0.3mm≤R≤2mm.

13. The ultrasonic horn of claim 1, wherein, The welding portion is provided with a separation groove, the separation groove is arranged around the periphery of the main welding area and located between the main welding area and the pressure relief area.

14. The ultrasonic horn of claim 13, wherein, The separation groove is in communication with the groove.

15. The ultrasonic horn of claim 1, wherein, In the circumferential direction of the main welding area, a width of the groove is L1, L1=T×H1, 2≤T≤3.

5.

16. The ultrasonic horn of claim 15, wherein, The groove is provided with at least two, the at least two grooves are arranged at intervals in the circumferential direction of the main welding area.

17. The ultrasonic horn of claim 16, wherein, In the circumferential direction of the main welding area, a spacing between two adjacent grooves is L2, L2=W×L1, 0.15≤W≤1.

18. The ultrasonic horn of claim 1, wherein, The pressure relief area comprises a curved area and two flat areas, the two flat areas are oppositely arranged on two sides of the main welding area, the curved area is connected between the two flat areas, and the groove is arranged in the flat area.

19. An ultrasonic welding device characterized by comprising: An ultrasonic welding device comprising an ultrasonic generator, an ultrasonic transducer and the ultrasonic welding head according to any one of claims 1-18, the ultrasonic transducer being connected between the ultrasonic generator and the ultrasonic welding head, the welding portion of the ultrasonic welding head being used for welding a tab in a battery cell to a transition sheet.

20. A battery production system characterized by comprising: The ultrasonic welding device according to claim 19.

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