Welding device

Abstract

The application discloses a welding device, which comprises a bearing table and a welding assembly. The bearing table is used for bearing an integrated busbar assembly, and the integrated busbar assembly comprises a plurality of busbars and a plurality of connecting plates. The welding assembly is arranged on one side of the bearing table in a first direction, and the welding assembly comprises an upper die part and a magnetic pulse welding part arranged on the side of the upper die part facing the bearing table in the first direction. The magnetic pulse welding part comprises a body and a plurality of welding heads arranged on the side of the body facing the bearing table. The plurality of welding heads are distributed at intervals, and each welding head is used for welding each connecting plate and busbar. The plurality of welding heads can be used for synchronously welding the plurality of connecting plates and corresponding busbars, so that the welding efficiency can be greatly improved, and the preparation efficiency of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing equipment, and in particular to a welding apparatus. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] Battery devices involve numerous interconnections between materials, with the connection between the busbar and the flexible circuit board being the most common. Currently, nickel sheets are primarily used as the intermediate connection medium, with both ends of the nickel sheet connected to the busbar and the flexible circuit board, respectively. Specifically, the nickel sheet achieves a reliable connection to the flexible circuit board through soldering, while the connection between the nickel sheet and the busbar involves aluminum-nickel dissimilar metal welding. Traditionally, laser welding is used to achieve the connection through fusion bonding.

[0004] However, as the capacity of power batteries increases, the number of busbars that need to be connected also increases. Currently, laser welding is used to connect individual nickel sheets to busbars, and it often takes hundreds of seconds to connect an entire busbar assembly. Therefore, how to improve the manufacturing efficiency of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0005] In view of the above problems, this application provides a welding apparatus that can improve the manufacturing efficiency of battery devices.

[0006] In a first aspect, this application provides a welding apparatus, which includes a support platform and a welding assembly. The support platform is used to support an integrated busbar assembly, which includes multiple busbars and multiple connecting pieces. The welding assembly is disposed on one side of the support platform in a first direction, and includes an upper mold portion and a magnetic pulse welding portion disposed on the upper mold portion facing the support platform in the first direction. The magnetic pulse welding portion includes a body and multiple welding heads disposed on the body facing the support platform. The multiple welding heads are spaced apart, and each welding head is used to weld each connecting piece and busbar.

[0007] In the embodiments of this application, the welding apparatus includes a support platform and a welding assembly. The support platform supports the integrated busbar assembly, and the busbars and connecting pieces of the integrated busbar assembly can be placed on the support platform for welding. The welding assembly includes an upper mold and a magnetic pulse welding section. The upper mold is used to fix the magnetic pulse welding section. The magnetic pulse welding section includes a body and welding heads. There are multiple welding heads, and each welding head is used to weld each connecting piece and busbar. Multiple welding heads can simultaneously weld multiple connecting pieces and corresponding busbars, which can greatly improve welding efficiency and thus improve the manufacturing efficiency of the battery device.

[0008] In some embodiments, the welding apparatus further includes a fixing seat, which is disposed on the side of the magnetic pulse welding part away from the upper mold part along the first direction and is fixedly connected to the upper mold part. The fixing seat is provided with a through welding hole, and the welding head extends out of the welding hole toward the support platform.

[0009] In these embodiments, the welding apparatus further includes a fixing seat disposed on the side of the magnetic pulse section opposite to the upper mold section, and the fixing seat can provide support for the magnetic pulse welding section. The fixing seat and the upper mold section are fixedly connected, thereby fixing the magnetic pulse welding section between the fixing seat and the upper mold section. The fixing seat is provided with a welding hole, and the welding head is disposed in the welding hole and can protrude from the welding hole, so that the welding head can weld the connecting piece and busbar on the support platform.

[0010] In some embodiments, the fixing base further includes a limiting groove, the opening of which is disposed facing the upper mold portion, the body is located in the limiting groove, and the welding hole and the limiting groove are interconnected.

[0011] In these embodiments, the fixing base is also provided with a limiting groove, the opening of which faces the upper mold portion. That is, the limiting groove is formed by a recess in the surface of the fixing base facing the upper mold portion. The main body is located within the limiting groove, which provides a limiting effect on the main body, improving the stability of the magnetic pulse welding part's position. The welding hole and the limiting groove are interconnected, allowing the welding head located on the side of the main body facing the support platform to extend through the welding hole without affecting the normal operation of the welding head.

[0012] In some embodiments, the body includes a plurality of welding segments spaced apart along a second direction and a connecting portion connecting two adjacent welding segments, with welding heads disposed on the welding segments, and the second direction and the first direction intersecting.

[0013] In these embodiments, the body includes multiple welding segments, each welding segment can correspond to multiple connecting pieces and busbars in each row, and two adjacent welding segments can correspond to the same flexible circuit board, so that multiple connecting pieces located on both sides of the same flexible circuit board can be welded at the same time.

[0014] In some embodiments, the welding segments extend along a third direction, and a plurality of welding heads are spaced apart on the welding segments along the third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar.

[0015] In these embodiments, the welding segments extend along a third direction and can correspond to flexible circuit boards extending along a third direction. Multiple welding heads are spaced apart along a third direction on the welding segments, so that multiple welding heads on the same welding segment can simultaneously weld multiple connecting pieces corresponding to the same circuit board.

[0016] In some embodiments, the welding head has a welding surface facing away from the upper mold portion, and the angle between the welding surface and the first direction is an acute angle.

[0017] In these alternative embodiments, the welding head is provided with a welding surface, which is inclined relative to the first direction to form a specific collision angle. Welding the connecting pieces with a specific collision angle and welding surface can improve the welding yield.

[0018] In some embodiments, the angle between the welding surface and the reference surface is 15 degrees to 30 degrees, and the reference surface is perpendicular to the first direction.

[0019] In these alternative embodiments, when the angle between the welding surface and the reference surface is within the above-mentioned range, it can improve the welding yield due to insufficient tilt of the welding surface caused by the small angle between the welding surface and the reference surface; it can also improve the welding yield caused by the large angle between the welding surface and the reference surface.

[0020] In some embodiments, the body includes a plurality of welded segments spaced apart along a second direction, wherein the weld surfaces of at least two adjacent welded segments are inclined away from the support platform in mutually opposing directions, and the second direction and the first direction intersect.

[0021] In these alternative embodiments, the connecting piece is typically pre-connected to the flexible circuit board. The connecting piece and the busbar need to be soldered together, thus creating a gap between them. The connecting piece may be tilted away from the support platform in the direction from the flexible circuit board to the busbar. Since the busbar is typically located on both sides of the flexible circuit board, the connecting piece can also be tilted away from the support platform in the direction away from the flexible circuit board. In the soldering apparatus, at least two adjacent soldering segments can be used to correspond to the same flexible circuit board. In these two soldering segments corresponding to the same flexible circuit board, they are tilted away from the support platform in a direction away from each other, i.e., away from the circuit board, so that the tilt direction of the soldering surface and the tilt direction of the connecting piece can match each other, further improving the soldering yield.

[0022] In some embodiments, the welding apparatus further includes support columns disposed on the upper mold portion, with multiple support columns spaced apart, and the magnetic pulse welding portion located between the multiple support columns.

[0023] In these alternative embodiments, by providing multiple support columns, the upper mold part can abut against the support platform through the support columns, ensuring a suitable distance between the upper mold part and the support platform, which facilitates the welding operation of the connecting piece and the busbar.

[0024] In some embodiments, the welding apparatus further includes a first driving unit and / or a second driving unit, wherein the first driving unit is used to drive the support platform to move along a second direction and / or a third direction. The second driving unit is used to drive the upper mold part to move along the first direction.

[0025] In these optional embodiments, the first drive unit can move the support platform, facilitating loading and unloading and improving the welding efficiency of multiple integrated busbar assemblies. The second drive unit cannot move the upper mold unit, allowing for easy adjustment of the position of the magnetic pulse welding unit according to actual needs.

[0026] In some embodiments, the body and the welding head are made of conductive materials, and the two ends of the body are provided with electrical connection terminals for connecting to a power supply circuit.

[0027] In these alternative embodiments, a power supply circuit can be connected via an electrical connection terminal. Since both the body and the welding head are charged, a discharge current can be generated on the welding head, thereby generating a high-frequency magnetic field. The high-frequency magnetic field can generate an induced current on the connecting piece. When the induced current is opposite in direction to the electrical pulse current, under the action of the Lorentz force, the connecting piece will strike the busbar at an extremely high speed, completing the welding of the busbar and the connecting piece. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the welding apparatus provided in some embodiments of this application; Figure 2 This is an exploded structural diagram of a welding apparatus provided in some embodiments of this application; Figure 3 yes Figure 2 A magnified schematic diagram of the local structure at point I; Figure 4 This is a schematic diagram of the magnetic pulse welding section of the welding apparatus provided in the embodiments of this application; Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point II; Figure 6 This is a schematic diagram of the drive of the magnetic pulse welding section of the welding apparatus provided in the embodiments of this application; Figure 7 This is a top view of the mounting base of the welding apparatus provided in the embodiments of this application; Figure 8 yes Figure 7 Sectional view at point BB; Figure 9 yes Figure 7 A three-dimensional sectional view; Figure 10 This is a partial exploded structural diagram of the welding apparatus provided in some embodiments of this application; Figure 11 yes Figure 10 A partial sectional view; Figure 12 yes Figure 11 A partial sectional view.

[0029] Explanation of reference numerals in the attached figures: 10. Welding equipment; 20. Integrated busbar assembly; 21. Flexible circuit board; 22. Busbar; 23. Connecting piece; 100. Support platform; 200, Welding assembly; 210, Upper mold part; 211, Second connecting hole; 212, Support column; 220, Magnetic pulse welding part; 221, Body; 221a, Welding segment; 221b, Connecting part; 222, Welding head; 222a, Welding surface; 300, Fixing base; 310, Welding hole; 320, Limiting groove; 330, First connecting hole; 400, Power supply circuit; T, Transformer; A, Rectifier; C, Capacitor; K2, Air switch; K1, Charging switch; R, Charging resistor; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0030] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0031] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0032] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0036] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power 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 in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0037] Battery devices involve numerous interconnections between materials, with the connection between the busbar and the flexible circuit board being the most common. Currently, nickel sheets are primarily used as the intermediate connection medium, with both ends of the nickel sheet connected to the busbar and the flexible circuit board, respectively. Specifically, the nickel sheet achieves a reliable connection to the flexible circuit board through soldering, while the connection between the nickel sheet and the busbar involves aluminum-nickel dissimilar metal welding. Traditionally, laser welding is used to achieve the connection through fusion bonding.

[0038] However, the fabrication efficiency of battery devices is severely limited. This is because the flexible circuit board needs to be connected to the busbar of each individual battery cell, requiring the soldering of multiple nickel sheets and busbars for each device. Related technologies often employ single-point soldering, sequentially soldering multiple nickel sheets and busbars. Connecting an entire busbar assembly can often take hundreds of seconds. Therefore, improving the fabrication efficiency of battery devices is increasingly attracting the attention of those skilled in the art.

[0039] To address the aforementioned issues, this application provides a welding apparatus comprising a support platform and a welding assembly. The support platform supports an integrated busbar assembly, which includes multiple busbars and multiple connecting pieces. The welding assembly is disposed on one side of the support platform in a first direction. The welding assembly includes an upper mold portion and a magnetic pulse welding portion disposed on the upper mold portion facing the support platform in the first direction. The magnetic pulse welding portion includes a body and multiple welding heads disposed on the body facing the support platform. The welding heads are spaced apart, and each welding head is used to weld connecting pieces and busbars. By using multiple welding heads, multiple connecting pieces and corresponding busbars can be welded simultaneously, significantly improving welding efficiency and thus increasing the fabrication efficiency of the battery device.

[0040] The technical solutions described in the embodiments of this application are applicable to busbars and connecting pieces in welding battery devices, and the battery devices are applicable to electrical devices that use battery devices.

[0041] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0042] In this embodiment, the battery device includes multiple battery cells, each battery cell including electrode terminals, and a busbar that can be electrically connected to the electrode terminals. The electrode terminals of the multiple battery cells can be connected to multiple busbars corresponding to the same flexible circuit board, respectively.

[0043] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0044] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0045] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0046] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0047] Please refer to Figures 1 to 5 , Figure 1 This is a schematic diagram of the welding apparatus provided in some embodiments of this application. Figure 2This is an exploded structural diagram of a welding apparatus provided in some embodiments of this application. Figure 3 yes Figure 2 A magnified schematic diagram of the structure at point I in the middle. Figure 4 This is a schematic diagram of the structure of the magnetic pulse welding section of the welding apparatus provided in the embodiments of this application. Figure 5 yes Figure 4 A magnified schematic diagram of the structure at point II.

[0048] like Figures 1 to 5 As shown, in a first aspect, this application provides a welding apparatus 10, which includes a support platform 100 and a welding assembly 200. The support platform 100 is used to support an integrated busbar assembly 20, which includes a plurality of busbars 22 and a plurality of connecting pieces 23. The welding assembly 200 is disposed on one side of the support platform 100 in a first direction X. The welding assembly 200 includes an upper mold portion 210 and a magnetic pulse welding portion 220 disposed on the upper mold portion 210 along the first direction X toward the support platform 100. The magnetic pulse welding portion 220 includes a body 221 and a plurality of welding heads 222 disposed on the body 221 toward the support platform 100. The plurality of welding heads 222 are spaced apart, and each welding head 222 is used to weld each connecting piece 23 and busbar 22.

[0049] Optionally, the integrated busbar assembly 20 also includes a flexible circuit board 21, and a connecting piece 23 for connecting the flexible circuit board 21 and the busbar 22, which is used to connect components such as the tabs of the battery cells.

[0050] In this embodiment, the welding apparatus 10 includes a support platform 100 and a welding assembly 200. The support platform 100 supports the integrated busbar assembly 20, and the busbars 22 and connecting pieces 23 of the integrated busbar assembly 20 can be disposed on the support platform 100 for welding. The welding assembly 200 includes an upper mold portion 210 and a magnetic pulse welding portion 220. The upper mold portion 210 is used to fix the magnetic pulse welding portion 220. The magnetic pulse welding portion 220 includes a body 221 and welding heads 222. There are multiple welding heads 222, and each welding head 222 is used to weld each connecting piece 23 and busbar 22. Multiple connecting pieces 23 and corresponding busbars 22 can be welded simultaneously through multiple welding heads 222, which can greatly improve welding efficiency and thus improve the manufacturing efficiency of the battery device.

[0051] Optionally, the same integrated busbar assembly 20 may include multiple flexible circuit boards 21, which are arranged side by side along the second direction Y. The flexible circuit boards 21 extend themselves along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other, and the first direction X, the second direction Y, and the third direction Z are not coplanar; for example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0052] Optionally, the width of the connecting piece 23 in the third direction Z and the width of the welding head 222 in the third direction Z are close, so that the shape of the welding head 222 and the shape of the connecting piece 23 are more matched.

[0053] Optionally, the body 221 and the welding head 222 can be integrally formed. For example, the materials of the body 221 and the welding head 222 both include conductive materials such as copper, and both the body 221 and the welding head 222 can conduct electricity. The body 221 and the welding head 222 are integrally cast.

[0054] In some embodiments, such as Figure 6 As shown, the magnetic pulse welding unit 220 is connected to the power supply circuit 400, which supplies power to the magnetic pulse welding unit 220. Optionally, the power supply circuit 400 includes a charging resistor R, a transformer T, a rectifier A, a capacitor C, an air switch K2, and a charging switch K1. When the charging switch K1 is open, during the charging process of the magnetic pulse welding unit 220 through the power supply circuit 400, a 220V AC power supply can be used. The 220V AC power supply is first stepped up by the transformer T, then rectified by the rectifier A to convert the AC power into DC power, and then the DC current flows to charge the capacitor C. When the charging voltage reaches the predetermined voltage, the charging circuit is disconnected, triggering the discharge air switch K2, causing the capacitor C to generate a high-frequency pulse current discharge. When the discharge current flows through the welding head 222, a high-frequency magnetic field can be generated. The connecting piece 23 is located in the high-frequency magnetic field. Under the influence of the high-frequency magnetic field, the connecting piece 23 can generate an induced current. The induced current is opposite to the direction of the electric pulse current. Under the action of the Lorentz force, the connecting piece 23 will hit the busbar 22 at an extremely high speed, completing the pulse welding between the busbar 22 and the connecting piece 23.

[0055] In some embodiments, please refer to the following: Figures 1 to 7 The welding device 10 also includes a fixing seat 300, which is disposed on the side of the magnetic pulse welding part 220 away from the upper mold part 210 and is fixedly connected to the upper mold part 210. The fixing seat 300 is provided with a through welding hole 310, and the welding head 222 extends out of the welding hole 310 toward the support table 100.

[0056] In these embodiments, the welding apparatus 10 further includes a fixing base 300, which is disposed on the side of the magnetic pulse section opposite to the upper mold section 210. The fixing base 300 can provide support for the magnetic pulse welding section 220. The fixing base 300 and the upper mold section 210 are fixedly connected, thereby fixing the magnetic pulse welding section 220 between the fixing base 300 and the upper mold section 210. The fixing base 300 is provided with a welding hole 310, and the welding head 222 is disposed in the welding hole 310 and can be exposed through the welding hole 310, so that the welding head 222 can weld the connecting piece 23 and the busbar 22 on the support platform 100.

[0057] Optional, such as Figure 1 , Figure 2 and Figure 7 As shown, the fixed base 300 is provided with a first connecting hole 330, and the upper mold part 210 is provided with a second connecting hole 211. The fixed base 300 can be fixed to the upper mold part 210 by passing the connecting bolt through the first connecting hole 330 and the second connecting hole 211.

[0058] Optionally, the magnetic pulse welding part 220 includes a plurality of welding segments 221a distributed at intervals along the second direction Y. The first connecting hole 330 and the second connecting hole 211 can be correspondingly disposed in the gap between two adjacent welding segments 221a to improve the influence of the connecting bolt on the magnetic pulse welding part 220.

[0059] In some embodiments, please continue reading Figures 1 to 9 The fixed base 300 also includes a limiting groove 320, the opening of the limiting groove 320 is set facing the upper mold part 210, the body 221 is located in the limiting groove 320, and the welding hole 310 and the limiting groove 320 are interconnected.

[0060] In these embodiments, the fixing base 300 is also provided with a limiting groove 320. The opening of the limiting groove 320 faces the upper mold portion 210. That is, the limiting groove 320 is formed by a recess in the surface of the fixing base 300 facing the upper mold portion 210. The body 221 is located in the limiting groove 320. The limiting groove 320 can provide support and limitation for the body 221, improving the stability of the position of the magnetic pulse welding part 220. The welding hole 310 and the limiting groove 320 are interconnected, so that the welding head 222 located on the side of the body 221 facing the support platform 100 can extend out of the welding hole 310 without affecting the normal operation of the welding head 222.

[0061] Optionally, the shape of the limiting groove 320 is adapted to the shape of the body 221. For example, the depth of the limiting groove 320 is the same as the height of the body 221, the width of the limiting groove 320 is the same as the width of the body 221, and the extension path of the limiting groove 320 is the same as the extension path of the body 221, so that the limiting groove 320 can provide better limiting to the body 221.

[0062] In some embodiments, such as Figure 4 and Figure 5 As shown, the body 221 includes a plurality of welding segments 221a spaced apart along the second direction Y and a connecting portion 221b connecting two adjacent welding segments 221a, and a welding head 222 is disposed on the welding segment 221a.

[0063] In these embodiments, the body 221 includes multiple welding segments 221a, each welding segment 221a can correspond to multiple connecting pieces 23 and busbars 22 in each row, and two adjacent welding segments 221a can correspond to the same flexible circuit board 21, so that multiple connecting pieces 23 located on both sides of the same flexible circuit board 21 can be welded at the same time.

[0064] Optionally, when the body 221 includes the aforementioned welding segments 221a and connecting portions 221b, the welding segments 221a and connecting portions 221b are located within the limiting groove 320. Optionally, multiple welding segments 221a are connected end-to-end via the connecting portions 221b. When both the body 221 and the welding head 222 include conductive material, multiple welding segments 221a are connected in series via the connecting portions 221b, and multiple welding heads 222 are connected in series. Multiple welding heads 222 can be controlled to weld simultaneously via the same power supply device. Optionally, when multiple welding segments 221a are connected end-to-end in an S-shape via the connecting portions 221b, the limiting groove 320 includes multiple groove segments, which are connected end-to-end in an S-shape.

[0065] In some embodiments, such as Figure 4 and Figure 5 As shown, the welding segment 221a extends along the third direction Z, and multiple welding heads 222 are distributed at intervals along the third direction Z on the welding segment 221a.

[0066] In these embodiments, the welding segment 221a extends along the third direction Z and can be configured to correspond to the flexible circuit board 21 extending along the third direction Z. Multiple welding heads 222 are distributed at intervals along the third direction Z on the welding segment 221a, so that multiple welding heads 222 on the same welding segment 221a can simultaneously weld multiple connecting pieces 23 corresponding to the same circuit board.

[0067] When the flexible circuit board 21 extends along the third direction Z, busbars 22 are provided on both sides of the flexible circuit board 21 in the second direction Y. Multiple connecting pieces 23 are located on both sides of the flexible circuit board 21 in the second direction Y to connect the flexible circuit board 21 and the multiple busbars 22.

[0068] Optionally, at least two adjacent welding segments 221a along the second direction Y correspond to the same flexible circuit board 21. Optionally, when the integrated busbar assembly 20 includes two flexible circuit boards 21, the body 221 includes four welding segments 221a spaced apart along the second direction Y. Optionally, the four welding segments 221a are connected end-to-end by three connecting portions 221b.

[0069] In some embodiments, such as Figures 1 to 12As shown, the welding head 222 has a welding surface 222a that is away from the upper mold portion 210, and the angle α between the welding surface 222a and the first direction X is an acute angle.

[0070] In these optional embodiments, the welding head 222 is provided with a welding surface 222a, which is inclined relative to the first direction X, and can form a specific collision angle. The welding of the connecting piece 23 with the specific collision angle and the welding surface 222a can improve the welding yield.

[0071] In some embodiments, the angle α between the welding surface 222a and the reference surface is 15 degrees to 30 degrees, and the reference surface is perpendicular to the first direction X.

[0072] In these optional embodiments, when the included angle α between the welding surface 222a and the reference surface is within the above-mentioned range, it can both improve the welding yield due to insufficient tilt of the welding surface 222a caused by the included angle α between the welding surface 222a and the reference surface being too small, and improve the welding yield caused by the included angle α between the welding surface 222a and the reference surface being too large.

[0073] Optionally, the width of the welding surface 222a in the third direction Z is the same as the width of the connecting piece 23 in the third direction Z, making the dimensions of the welding surface 222a and the connecting piece 23 more compatible. Optionally, the reference surface is parallel to both the second direction Y and the third direction Z.

[0074] In some embodiments, the body 221 includes a plurality of welding segments 221a spaced apart along a second direction Y. At least two adjacent welding segments 221a have welding surfaces 222a that are inclined away from the support platform 100 in mutually opposing directions. For example, two welding segments 221a corresponding to the same flexible circuit board 21 may have welding surfaces 222a that are inclined away from the support platform 100 in mutually opposing directions.

[0075] The connecting piece 23 is typically pre-connected to the flexible circuit board 21, and the connecting piece 23 and the busbar 22 need to be soldered together. Therefore, in the integrated busbar assembly 20 located on the support platform 100, the connecting piece 23 and the flexible circuit board 21 are already connected to each other, and the connecting piece 23 and the flexible circuit board 21 are in contact with each other. There may be a gap between the connecting piece 23 and the busbar 22. The connecting piece 23 may be tilted away from the support platform 100 in the direction from the flexible circuit board 21 to the busbar 22. Since the busbar 22 is typically located on both sides of the flexible circuit board 21, the connecting piece 23 can be tilted away from the support platform 100 in the direction away from the flexible circuit board 21.

[0076] In these embodiments, at least two adjacent welding segments 221a in the welding apparatus 10 can be configured corresponding to the same flexible circuit board 21. Among the two welding segments 221a configured corresponding to the same flexible circuit board 21, the two welding segments 221a are inclined in a direction away from each other, i.e. away from the flexible circuit board 21, so that the tilt direction of the welding surface 222a and the tilt direction of the connecting piece 23 can match each other to further improve the welding yield.

[0077] In some embodiments, such as Figure 1 and Figure 2 As shown, the welding device 10 also includes support columns 212, which are disposed on the upper mold part 210. Multiple support columns 212 are spaced apart, and the magnetic pulse welding part 220 is located between the multiple support columns 212.

[0078] In these alternative embodiments, by providing multiple support columns 212, the upper mold portion 210 can abut against the support platform 100 through the support columns 212, ensuring that there is a suitable distance between the upper mold portion 210 and the support platform 100, which facilitates the welding operation of the connecting piece 23 and the busbar 22.

[0079] Optionally, there are four support columns 212, which are located at the four corners of the upper mold part 210, and the magnetic pulse welding part 220 and the base are located between the four support columns 212.

[0080] In some embodiments, the welding apparatus 10 further includes a first driving unit and / or a second driving unit (not shown in the figure), wherein the first driving unit is used to drive the support platform 100 to move along the second direction Y and / or the third direction Z. The second driving unit is used to drive the upper mold portion 210 to move along the first direction X.

[0081] In these optional embodiments, the first drive unit can move the support platform 100, facilitating loading and unloading and improving the welding efficiency of multiple integrated busbar assemblies 20. The second drive unit cannot move the upper mold 210, allowing for easy adjustment of the position of the magnetic pulse welding unit 220 according to actual needs.

[0082] Optionally, the first drive unit and / or the second drive unit may include a hydraulic telescopic rod, a threaded screw, etc.

[0083] In some embodiments, the materials of the body 221 and the welding head 222 include conductive materials, and electrical connection ends are provided at both ends of the body 221 for connecting to the power supply circuit 400.

[0084] In these optional embodiments, a power supply circuit 400 can be connected via an electrical connection terminal. Since both the body 221 and the welding head 222 are charged, a discharge current can be formed on the welding head 222, thereby forming a high-frequency magnetic field. The high-frequency magnetic field can induce a current on the connecting piece 23. When the induced current is opposite to the direction of the electrical pulse current, under the action of the Lorentz force, the connecting piece 23 will strike the busbar 22 at an extremely high speed, completing the welding of the busbar 22 and the connecting piece 23.

[0085] Please see Figures 1 to 12 As shown, this application embodiment provides a welding apparatus 10, which includes a support platform 100 and a welding assembly 200. The support platform 100 supports an integrated busbar assembly 20, which includes multiple busbars 22 and multiple connecting pieces 23. The welding assembly 200 is disposed on one side of the support platform 100 in a first direction X. The welding assembly 200 includes an upper mold portion 210 and a magnetic pulse welding portion 220 disposed on the upper mold portion 210 along the first direction X towards the support platform 100. The magnetic pulse welding portion 220 includes a body 221 and multiple welding heads 222 disposed on the body 221 towards the support platform 100. The multiple welding heads 222 are spaced apart, and each welding head 222 is used to weld each connecting piece 23 and busbar 22. The magnetic pulse welding portion 220 is connected to a power supply circuit 400, and the power supply circuit 400 can supply power to the magnetic pulse welding portion 220. The welding apparatus 10 also includes a fixing base 300, which is disposed on the side of the magnetic pulse welding section 220 away from the upper mold section 210 along the first direction X and is fixedly connected to the upper mold section 210. The fixing base 300 is provided with a through welding hole 310, and the welding head 222 extends out of the welding hole 310 toward the support platform 100. The fixing base 300 also includes a limiting groove 320, the opening of which is disposed toward the upper mold section 210. The body 221 is located in the limiting groove 320, and the welding hole 310 and the limiting groove 320 are interconnected. The body 221 includes a plurality of welding segments 221a spaced apart along the second direction Y and a connecting portion 221b connecting two adjacent welding segments 221a. The welding head 222 is disposed on the welding segment 221a. The welding segment 221a extends along the third direction Z, and the plurality of welding heads 222 are distributed spaced apart along the third direction Z on the welding segment 221a. The welding head 222 has a welding surface 222a facing away from the upper mold portion 210, and the angle α between the welding surface 222a and the first direction X is an acute angle. The body 221 includes a plurality of welding segments 221a spaced apart along the second direction Y. At least two adjacent welding segments 221a are provided corresponding to the same flexible circuit board 21. Among the welding surfaces 222a of the two welding segments 221a provided corresponding to the same flexible circuit board 21, they are inclined away from the support platform 100 in mutually opposing directions.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding apparatus, characterized in that, The welding apparatus includes: A support platform is used to support an integrated busbar assembly, which includes multiple busbars and multiple connecting pieces; A welding assembly is disposed on one side of the support platform in a first direction. The welding assembly includes an upper mold portion and a magnetic pulse welding portion disposed on the upper mold portion facing the support platform along the first direction. The magnetic pulse welding part includes a body and a plurality of welding heads disposed on the side of the body facing the support platform. The plurality of welding heads are spaced apart, and each welding head is used to weld the connecting piece and the busbar.

2. The welding apparatus according to claim 1, characterized in that, Also includes: A fixing seat is disposed on the side of the magnetic pulse welding part away from the upper mold part along the first direction and is fixedly connected to the upper mold part. The fixing seat is provided with a through welding hole, and the welding head extends out of the welding hole toward the support platform.

3. The welding apparatus according to claim 2, characterized in that, The fixing base also includes a limiting groove, the opening of which is disposed facing the upper mold portion, the body is located in the limiting groove, and the welding hole and the limiting groove are interconnected.

4. The welding apparatus according to claim 1, characterized in that, The body includes a plurality of welding segments spaced apart along a second direction and a connecting portion connecting two adjacent welding segments. The welding head is disposed on the welding segment, and the second direction and the first direction are intersecting.

5. The welding apparatus according to claim 4, characterized in that, The welding segment extends along a third direction, and multiple welding heads are distributed at intervals along the third direction on the welding segment. The first direction, the second direction, and the third direction intersect each other but are not coplanar.

6. The welding apparatus according to claim 1, characterized in that, The welding head has a welding surface facing away from the upper mold portion, and the angle between the welding surface and the first direction is an acute angle.

7. The welding apparatus according to claim 6, characterized in that, The angle between the welding surface and the reference surface is 15 degrees to 30 degrees, and the reference surface is perpendicular to the first direction.

8. The welding apparatus according to claim 7, characterized in that, The body includes a plurality of welded segments spaced apart along a second direction. In at least two adjacent welded segments, the welded surfaces are inclined away from the support platform in mutually opposing directions. The second direction intersects with the first direction.

9. The welding apparatus according to claim 1, characterized in that, It also includes support columns, which are disposed on the upper mold portion, with multiple support columns spaced apart, and the magnetic pulse welding portion located between the multiple support columns.

10. The welding apparatus according to claim 1, characterized in that, Also includes: A first driving unit is used to drive the support platform to move along a second direction and / or a third direction; And / or, a second driving unit, for driving the upper mold part to move along the first direction, wherein the first direction, the second direction and the third direction intersect each other and are not coplanar.

11. The welding apparatus according to claim 1, characterized in that, The body and the welding head are made of conductive materials, and the two ends of the body are provided with electrical connection terminals for connecting to a power supply circuit.

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