Electrical connection assembly, battery device and electric device

Abstract

The utility model discloses a kind of electric connection assembly, battery device and electric device, electric connection assembly includes: first electrically conductive piece, the surface of first electrically conductive piece is equipped with multiple solder resist bridges, multiple solder resist bridges are interval arranged along first direction and opposite surface protrude, to make surface form multiple first soldering areas;Second electrically conductive piece, second electrically conductive piece is equipped with multiple second soldering areas, multiple second soldering areas are interval arranged along first direction, and with multiple first soldering areas one-to-one correspondence, between any two adjacent second soldering areas, solder resist bridge is equipped, every second soldering area is equipped with through-hole, every second soldering area is welded with corresponding first soldering area by soldering tin.The utility model is favorable to the process of soldering tin welding first soldering area and second soldering area exhaust, can reduce the bubble rate of the welding position of first electrically conductive piece and second electrically conductive piece, improve the welding reliability of first electrically conductive piece and second electrically conductive piece.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrical connection component, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery consists of a casing and multiple individual battery cells housed within it. As a core component of new energy vehicles, the battery has high requirements in terms of both safety and lifespan. The battery involves many large-area current-carrying electrical connection components, such as the welding of aluminum or copper bars, as well as the welding of other large-area PCBA (printed circuit board assembly) boards.

[0003] Taking PCBA board soldering as an example, during the solder paste printing and component mounting stages, some air mixes into the contact surface, forming voids. During the low-temperature preheating stage, the solvent in the solder paste gradually evaporates, while the activity of deoxidizing agents such as organic acids in the flux increases, beginning to remove oxidation and contaminants from components and the PCB surface. This process is accompanied by a large amount of water vapor (oxidation-reduction products). Residual volatile gases from the solvent and water vapor formed after deoxidation are encapsulated by the gradually liquefied solder paste, forming voids at this stage. During the high-temperature reflow stage, the reaction becomes more intense, forming even more water vapor. Unreleased water vapor accumulates to form gas. When the solder reaches its melting point, its fluidity is at its best. At this point, the adsorption force between the solder and tin contact surface and the internal gas pressure help release the gas. Additionally, the gravity of the components also helps to expel the gas. During the cooling stage, the solder surface begins to oxidize, forming an oxide film that hinders gas release. Unreleased gas forms soldering voids after the solder cools and solidifies. A high bubble rate affects soldering consistency, the heat dissipation efficiency and lifespan of the PCBA board, and consequently, the reliability of the PCBA board, which in turn affects the reliability of the battery. Utility Model Content

[0004] This application provides an electrical connection component, a battery device, and an electrical device, which can effectively reduce the welding bubble rate of the electrical connection component, thereby improving the welding consistency of the electrical connection component, improving the reliability of the electrical connection component, and further improving the reliability of the battery device and the electrical device.

[0005] In a first aspect, embodiments of this application provide an electrical connection assembly, comprising: a first conductive element, the surface of which is provided with a plurality of solder resist bridges, the plurality of solder resist bridges being spaced apart along a first direction and protruding relative to the surface, so that the surface forms a plurality of first welding areas; a second conductive element, the second conductive element being provided with a plurality of second welding areas, the plurality of second welding areas being spaced apart along the first direction and corresponding one-to-one with the plurality of first welding areas, a solder resist bridge being provided between any two adjacent second welding areas, each second welding area being provided with a through hole, and each second welding area being welded to the corresponding first welding area by solder.

[0006] In the above technical solution, by setting multiple solder resist bridges on the first conductive component to form multiple first welding areas, and by setting through holes on the second welding area of ​​the second conductive component, an venting channel can be formed between the first and second conductive components. This facilitates venting during the soldering process of the first and second welding areas, reducing the bubble rate at the welding positions of the first and second conductive components, and improving the welding reliability and yield. Setting multiple solder resist bridges also creates cooling and heating zones during the conduction process of the first and second conductive components, reducing the risk of separation due to excessively high solder temperature, further improving the connection reliability of the first and second conductive components. The through holes also increase the bonding surface between the solder and the second conductive component, increasing the pull-out resistance between the first and second conductive components, which further improves the connection reliability.

[0007] In some embodiments of this application, a plurality of solder mask bridges are arranged at equal intervals along a first direction and are strips extending along a second direction, which is perpendicular to the first direction.

[0008] In the above technical solution, multiple solder bridges are strip-shaped, which can divide multiple first welding areas on the first conductive component into rectangular areas. The shape of the first welding area is relatively regular, which makes it easy to apply solder, reduces construction difficulty, and improves welding efficiency. Moreover, since the first welding area is rectangular, the width of the first welding area always remains consistent, which can also reduce the risk of weak welding points and help improve the welding reliability of the first conductive component and the second conductive component.

[0009] In some embodiments of this application, the width of the solder mask bridge in the first direction is H, wherein 0.125mm ≤ H ≤ 1mm. In the above technical solution, by setting the width of the solder mask bridge within the above range, it is possible to form an exhaust channel of suitable width while reducing the material used for the solder mask bridge, and also to make the structure of the first conductive element more compact, which is beneficial for reducing the size of the first conductive element in the first direction.

[0010] In some embodiments of this application, the width of the first welding area in the first direction is L1, where 2mm ≤ L1 ≤ 8mm. In the above technical solution, by setting the width of the first welding area within the aforementioned range, the welding width between the first welding area and the second welding area is within a suitable range. This ensures the welding reliability between the first and second welding areas while reducing the gas flow path, facilitating gas flow out from the location of the first welding area, reducing the bubble rate between the first and second conductive components, and improving connection reliability.

[0011] In some embodiments of this application, a plurality of second welding areas are equally spaced along a first direction and are strip-shaped extending along a second direction, which is perpendicular to the first direction. Each second welding area is provided with a plurality of through holes, which are spaced apart along the second direction.

[0012] In the above technical solution, the second welding area is rectangular, and its width remains consistent. This reduces the risk of weak weld points and improves the welding reliability of the first and second conductive components. Increasing the number of through holes increases the number of venting channels, which accelerates the gas discharge rate at the second welding area and increases the gas discharge volume. This further reduces the bubble rate between the second and first welding areas, thereby reducing the bubble rate of the first and second conductive components and improving the connection reliability of the first and second conductive components.

[0013] In some embodiments of this application, the orthographic projections of the second welding area and the corresponding first welding area on the surface coincide. In the first direction, the width of the first welding area is L1, and the through hole is a circular hole with a diameter of D, wherein 0.4L1≤D≤0.6L1. In the above technical solution, the second welding area and the first welding area are equal in size and shape, which allows the second welding area and the first welding area to be fully welded together by solder, reducing the risk of blank unwelded areas between the second welding area and the first welding area. This is beneficial for reducing the size of the first conductive component and the second conductive component and improving space utilization. By setting the diameter of the through hole and the width of the first welding area within the above-mentioned relationship range, it is possible to ensure that the through hole has a suitable size and that the through hole has a high gas venting effect while ensuring that the second conductive component has high strength and rigidity, thereby improving the connection reliability of the first conductive component and the second conductive component.

[0014] In some embodiments of this application, the center distance between any two adjacent through holes is L2, where D≤L2≤2D. In the above technical solution, by setting the center distance between any two adjacent through holes within the above range, the multiple through holes can be distributed relatively evenly without penetrating them. This improves the gas discharge efficiency at the location of the second conductive element while also giving the second conductive element higher structural strength and rigidity, thereby ensuring high connection reliability after welding the second conductive element and the first conductive element.

[0015] In some embodiments of this application, 2mm ≤ L2 ≤ 8mm. In the above technical solution, by setting L2 within the above range, a suitable parameter value can be provided for the center distance between any two adjacent through holes, which is beneficial to meet different usage requirements.

[0016] In some embodiments of this application, the minimum distance between two corresponding through holes in any two adjacent second welding areas is L3, where 2mm≤L3≤5mm. In the above technical solution, by setting the minimum distance between two corresponding through holes in any two adjacent second welding areas within the above range, the through holes can be kept at a suitable distance from the edge of the second welding area, which is beneficial to give the second welding area strong strength and rigidity after the through holes are opened.

[0017] In some embodiments of this application, the second conductive element has a first edge located at both ends in a first direction and a second edge located in a second direction. The distance between the second welding area near the first edge and the first edge is L4, wherein 2mm≤L4≤5mm; among the multiple through holes in each second welding area, the one near the second edge is an edge hole, and the distance between the edge hole and the adjacent second edge is L5, wherein 2mm≤L5≤5mm.

[0018] In the above technical solution, by setting the distance L4 between the second welding area and the first edge within the aforementioned range, the welding reliability of the solder between the second welding area and the first welding area can be improved, while also reducing the size of the second conductive component in the first direction. By setting the distance L5 between the outermost through hole and the second edge within the aforementioned range, the influence of the outermost through hole on the strength and rigidity of the second conductive component can be reduced, and the size of the second conductive component in the second direction can be reduced.

[0019] Secondly, embodiments of this application also provide a battery device, including an electrical connection component as described above.

[0020] In the above technical solution, since the electrical connection component has high welding reliability, the battery device using the electrical connection component also has high reliability.

[0021] Thirdly, embodiments of this application also provide an electrical device, including the battery device as described above.

[0022] In the above technical solution, since the battery device has high reliability, the electrical device using the battery device also has high reliability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle; Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application; Figure 3 This application provides schematic diagrams of the assembly structure of electrical connection components according to some embodiments; Figure 4 Exploded views of the first conductive element and solder provided for some embodiments of this application; Figure 5 Exploded views of the second conductive element and the first conductive element provided in some embodiments of this application; Figure 6 An exploded top view of the first and second conductive elements provided for some embodiments of this application; Figure 7 This is a schematic diagram of the welding state of pads and metal busbars in the prior art, where solder is used to weld them together. Figure 8 This is a schematic diagram of the soldering state of the pads and metal busbars of this application.

[0025] icon: 1000. Electrical appliances; 100. Battery device; 10. Box body; 11. First box body; 12. Second box body; 20. Battery cell; 30. Electrical connection assembly; 31. First conductive element; 311. Solder bridge; 312. First soldering area; 32. Second conductive element; 321. Second soldering area; 322. Through hole; 323. First edge; 324. Second edge; 33. Solder; 200, Controller; 300, Motor; X, First direction; Y, Second direction. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0028] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0032] In this application, "multiple" means two or more (including two).

[0033] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0034] The battery apparatus mentioned in the embodiments of this application may refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0035] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0036] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0037] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of 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 plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0038] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0039] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery consists of a casing and multiple individual battery cells housed within it. As a core component of new energy vehicles, the battery has high requirements in terms of both safety and cycle life. The battery involves many large-area current-carrying electrical connection components, such as the welding of aluminum or copper bars, as well as the welding of other large-area PCBA (printed circuit board assembly) boards.

[0040] In a typical battery, a controller or connector is required. The controller involves various PCBA boards, which solder various functional components onto the PCB pads. The connector connects the terminals of adjacent battery cells or solders battery cell assemblies to components such as busbars. These connectors are typically made of aluminum or copper. Taking PCBA board soldering as an example, during the solder paste printing and component mounting stages, some air gets into the contact surface, creating voids. During the low-temperature preheating stage, the solvent in the solder paste gradually evaporates, and the activity of deoxidizing agents such as organic acids in the flux increases, removing oxidation and contaminants from components and the PCB surface. This process is accompanied by a large amount of water vapor (oxidation-reduction products). Residual volatile gases from the solvent and water vapor formed after deoxidation are encapsulated by the gradually liquefied solder paste, forming these voids. During the high-temperature reflow stage, the reaction becomes more intense, generating even more water vapor. Unreleased water vapor accumulates to form gas. Solder has the best fluidity when it reaches its melting point. At this point, the adsorption force between the solder and the tin contact surface, along with the internal gas pressure, helps release the gas. Additionally, the gravity of the component also helps to expel the gas. During the cooling phase, the solder surface begins to oxidize, forming an oxide film that hinders gas escape. Unexploded gas forms voids after the solder cools and solidifies. This risk is higher, especially for soldering larger components and pads, where a higher bubble rate is more likely. A high bubble rate affects soldering consistency, the heat dissipation efficiency and lifespan of the PCBA board, and consequently, the reliability of the PCBA board, which in turn affects the reliability of the battery.

[0041] Based on the above considerations, in order to solve the problem of high bubble rate affecting the welding reliability when soldering large-area PCBA boards or connectors, the applicant has designed an electrical connection component, including a first conductive component and a second conductive component. The surface of the first conductive component is provided with multiple solder mask bridges, which are spaced apart along a first direction and protrude relative to the surface, so that multiple first welding areas are formed on the surface. The second conductive component is provided with multiple second welding areas, which are spaced apart along the first direction and correspond one-to-one with multiple first welding areas. A solder mask bridge is provided between any two adjacent second welding areas. Each second welding area is provided with a through hole, and each second welding area is soldered to the corresponding first welding area through solder.

[0042] In this type of electrical connection assembly, multiple solder bridges are formed on the first conductive element to create multiple first soldering zones, and through-holes are formed on the second soldering zones of the second conductive element. This creates an venting channel between the first and second conductive elements, facilitating venting during soldering of the first and second soldering zones. This reduces the bubble rate at the soldering points of the first and second conductive elements, improving the soldering reliability and yield. The multiple solder bridges also create cooling and heating zones during the conduction process of the first and second conductive elements, reducing the risk of detachment due to excessively high solder temperatures, further improving the connection reliability. The through-holes also increase the bonding surface between the solder and the second conductive elements, increasing the pull-out resistance between them and further enhancing the connection reliability.

[0043] The electrical connection components disclosed in this application can be used, but are not limited to, in devices requiring soldering, such as PCBA boards and battery devices, and can also be used in electrical devices using battery devices employing the electrical connection components disclosed in this application. In a PCBA board, the electrical connection component can refer to a component that provides conductive connections between the PCB board and various functional components. In a battery device, the electrical connection component can refer to a component that provides conductive connections between individual battery cells, between individual battery cells and busbars, between battery modules, and between battery modules and the controller. Battery devices using the electrical connection components disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0044] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0045] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1000 according to an embodiment of this application. Please refer to... Figure 1 , Figure 1The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0046] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0047] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0048] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0049] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes multiple rows of battery cells 20, which are arranged along the length of the housing 10. Each row of battery cells 20 includes a plurality of battery cells 20 arranged along the width of the housing 10; or, the multiple rows of battery cells 20 are arranged along the width of the housing 10, and each row of battery cells 20 includes a plurality of battery cells 20 arranged along the length of the housing 10.

[0050] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell 20 that can be recharged after discharge to activate its active materials and continue to be used. It can also 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 in this regard. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the shape of the battery cell 20 is a cuboid.

[0051] According to some embodiments of this application, refer to Figure 3 This application provides an electrical connection assembly 30, including a first conductive element 31 and a second conductive element 32. The surface of the first conductive element 31 is provided with a plurality of solder resist bridges 311, which are spaced apart along a first direction X and protrude relative to the surface, so that a plurality of first soldering areas 312 are formed on the surface. The second conductive element 32 is provided with a plurality of second soldering areas 321, which are spaced apart along the first direction X and correspond one-to-one with a plurality of first soldering areas 312. A solder resist bridge 311 is provided between any two adjacent second soldering areas 321. Each second soldering area 321 is provided with a through hole 322, and each second soldering area 321 is soldered to the corresponding first soldering area 312 by solder 33.

[0052] The first conductive element 31 and the second conductive element 32 can refer to conductive components that enable electrical connection, and their materials can be, but are not limited to, gold, copper, silver, or aluminum. In a PCBA board, the first conductive element 31 and the second conductive element 32 can refer to components that connect the PCB board and various functional components. For example, the PCB board can include a substrate, conductive lines, and pads. The conductive lines and pads are all disposed on the substrate and electrically connected. The components can include electrically connected device bodies and metal busbars. In this case, the first conductive element 31 can be a pad, and the second conductive element 32 can be a metal busbar. In the battery device 100, the first conductive element 31 and the second conductive element 32 can refer to welding tabs that connect battery cells 20 to each other, or welding tabs that electrically connect battery cells 20 to busbars, etc.

[0053] The solder mask bridge 311 can refer to a component that blocks the solder 33 on the first conductive element 31, and is used to divide the surface of the first conductive element 31 into multiple first soldering areas 312, which are used to solder to the second conductive element 32. The solder mask bridge 311 can be made of an insulating material. Optionally, the thickness of the solder mask bridge 311 is less than the thickness of the solder 33.

[0054] The second welding area 321 can refer to the area on the second conductive element 32 that is welded to the first welding area 312. The number of second welding areas 321 and first welding areas 312 can be equal and they are arranged in a one-to-one correspondence. The areas of the second welding areas 321 and first welding areas 312 can be equal or unequal. The through hole 322 can refer to a hole that penetrates the second conductive element 32 within the second welding area 321.

[0055] In the above technical solution, when the first conductive component 31 and the second conductive component 32 are connected by solder 33, solder 33 is first applied to multiple first soldering areas 312 of the first conductive component 31, and the thickness of the applied solder 33 is greater than the thickness of the solder bridge 311. Then, multiple second soldering areas 321 and multiple first soldering areas 312 of the second conductive component 32 are placed correspondingly, and the second soldering areas 321 and the corresponding first soldering areas 312 are soldered together by heating the solder 33. During the soldering process, since the thickness of the solder resist bridge 311 is less than the thickness of the solder 33, an exhaust channel is formed between the location of the solder resist bridge 311 and the second conductive component 32. The through hole 322 at the location of the second soldering area 321 also forms an exhaust channel. Part of the gas generated by the solder paste and moisture of the solder 33 at high temperature can be discharged along the solder resist bridge 311, and the other part can be discharged outward through the through hole 322. This reduces the bubble rate in the soldering area between the first conductive component 31 and the second conductive component 32, thus making the soldering consistency between the first conductive component 31 and the second conductive component 32 better and improving the soldering reliability of the first conductive component 31 and the second conductive component 32.

[0056] Secondly, the solder mask bridges 311 can also reduce heat transfer. The process of transmitting current in the electrical connection assembly 30 generates heat. Multiple solder mask bridges 311 can separate the two ends of the first conductive element 31 in the first direction X into a cold zone and a hot zone. The temperature of the hot zone is higher than that of the cold zone. In this way, when the temperature of the hot zone exceeds the melting point of the solder 33, the temperature of the cold zone can be kept below the melting point of the solder 33. As a result, the first conductive element 31 and the second conductive element 32 can still remain connected. This reduces the risk of the first conductive element 31 and the second conductive element 32 detaching due to the solder 33 melting at an excessively high temperature. This can improve the connection reliability of the first conductive element 31 and the second conductive element 32, thereby improving the overall reliability of the electrical connection assembly 30.

[0057] During the welding process of the first welding area 312 and the second welding area 321 by solder 33, the solder 33 can also overflow through the through hole 322 and connect around the through hole 322. This increases the wetting area of ​​the solder 33 on the second conductive component 32, that is, it increases the bonding surface between the solder 33 and the second conductive component 32, thereby further improving the welding reliability of the first conductive component 31 and the second conductive component 32, and is conducive to improving the pull-out force between the first conductive component 31 and the second conductive component 32.

[0058] Optionally, the first conductive element 31 can be a solder pad, and the second conductive element 32 can be a metal busbar, for example, refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the welding state of the pads and metal busbars in the prior art, where solder is used to weld them together. Figure 8 This is a schematic diagram showing the soldering state of the pads and metal busbars in this application. According to... Figure 7 It is known that in the prior art, there are more bubbles in the welding area, with a bubble rate of more than 40%. In contrast, the welding area of ​​the pads and metal busbars in this application has fewer bubbles, with a bubble rate of less than 3%. Compared with the prior art, this application can effectively reduce the welding bubble rate.

[0059] In the above technical solution, by setting multiple solder resist bridges 311 on the first conductive element 31 to form multiple first welding areas 312, and by setting through holes 322 on the second welding area 321 of the second conductive element 32, an exhaust channel can be formed between the first conductive element 31 and the second conductive element 32. This facilitates the exhaust of air during the soldering process of the solder 33 into the first welding areas 312 and the second welding areas 321, reducing the bubble rate at the welding positions of the first conductive element 31 and the second conductive element 32, and improving the welding reliability and yield of the first conductive element 31 and the second conductive element 32. By setting multiple solder resist bridges 311, cooling and hot zones can also be formed during the conduction process of the first conductive element 31 and the second conductive element 32, reducing the risk of the first conductive element 31 and the second conductive element 32 detaching due to excessively high solder temperature, and further improving the connection reliability of the first conductive element 31 and the second conductive element 32. The through-hole 322 can also increase the bonding surface between the solder 33 and the second conductive element 32, which can increase the pull-out force between the first conductive element 31 and the second conductive element 32, and help to further improve the connection reliability of the first conductive element 31 and the second conductive element 32.

[0060] In some embodiments of this application, reference is made to Figure 4 and Figure 5 Multiple weld bridges 311 are equally spaced along the first direction X and are strips extending along the second direction Y, which is perpendicular to the first direction X.

[0061] The first direction X and the second direction Y can be two mutually perpendicular directions. See Figure 4 and Figure 5 .

[0062] In the above technical solution, the multiple solder bridges 311 are strip-shaped, which can divide the multiple first welding areas 312 on the first conductive component 31 into rectangular areas. The shape of the first welding area 312 is relatively regular, which makes it easy to apply solder 33, reducing the construction difficulty and improving the welding efficiency. Moreover, since the first welding area 312 is rectangular, the width of the first welding area 312 remains consistent, which can also reduce the risk of weak welding points and help improve the welding reliability of the first conductive component 31 and the second conductive component 32.

[0063] In some embodiments of this application, reference is made to Figure 6 In the first direction X, the width of the weld bridge 311 is H, where 0.125mm≤H≤1mm.

[0064] H can be, but is not limited to, 0.125mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 0.9mm, 1mm, etc. If H is less than 0.125mm, the width of the solder mask bridge 311 is small, and the exhaust channel formed at the location of the solder mask bridge 311 is narrow, affecting the exhaust efficiency and thus hindering the reduction of the bubble rate. If H is greater than 1mm, the width of the solder mask bridge 311 is large, which will cause the size of the first conductive element 31 in the first direction X to increase, resulting in the first conductive element 31 occupying a larger space.

[0065] In the above technical solution, by setting the width of the solder resist bridge 311 within the above range, it is possible to reduce the material used of the solder resist bridge 311 while forming an exhaust channel of appropriate size and width, and also to make the structure on the first conductive element 31 more compact, which is beneficial to reduce the size of the first conductive element 31 in the first direction X.

[0066] In some embodiments of this application, reference is made to Figure 6 In the first direction X, the width of the first welding area 312 is L1, where 2mm≤L1≤8mm.

[0067] L1 can be, but is not limited to, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc. If the width of the first welding area 312 is less than 2mm, the welding width between the first welding area 312 and the second welding area 321 is small, affecting welding reliability. If the width of the first welding area 312 is greater than 8mm, this will result in the first welding area 312 being too wide, increasing the flow path of gas generated during soldering 33, which is not conducive to gas exhaust at the location of the first welding area 312. Optionally, L1 is 8mm.

[0068] In the above technical solution, by setting the width of the first welding area 312 within the above range, the welding width between the first welding area 312 and the second welding area 321 can be within a suitable range. This can reduce the gas flow path while ensuring the welding reliability between the first welding area 312 and the second welding area 321, which is conducive to the gas flowing out from the location of the first welding area 312. This can reduce the bubble rate between the first conductive component 31 and the second conductive component 32 and improve the connection reliability.

[0069] In some embodiments of this application, reference is made to Figure 3 , Figure 5 and Figure 6 Multiple second welding areas 321 are equally spaced along the first direction X and are strip-shaped extending along the second direction Y, which is perpendicular to the first direction X. Each second welding area 321 is provided with multiple through holes 322, which are spaced apart along the second direction Y.

[0070] In the above technical solution, the second welding area 321 is rectangular, and its width remains consistent. This reduces the risk of weak weld points and improves the welding reliability of the first conductive component 31 and the second conductive component 32. Increasing the number of through holes 322 increases the number of exhaust channels, which accelerates the gas exhaust speed at the location of the second welding area 321 and increases the gas emission volume. This further reduces the bubble rate between the second welding area 321 and the first welding area 312, thereby reducing the bubble rate of the first conductive component 31 and the second conductive component 32 and improving the connection reliability of the first conductive component 31 and the second conductive component 32.

[0071] Optionally, the through hole 322 is centrally arranged in the first direction X of the second welding area 321.

[0072] In some embodiments of this application, reference is made to Figure 6 The second welding area 321 and the corresponding first welding area 312 are projected onto the surface. In the first direction X, the width of the first welding area 312 is L1, and the through hole 322 is a circular hole with a diameter of D, where 0.4L1≤D≤0.6L1.

[0073] D can be, but is not limited to, 0.4L1, 0.42L1, 0.44L1, 0.46L1, 0.48L1, 0.5L1, 0.52L1, 0.54L1, 0.56L1, 0.58L1, 0.6L1, etc. If D is less than 0.4L1, the size of the through hole 322 is small, affecting the gas discharge efficiency. If D is greater than 0.6L1, the size of the through hole 322 is large, which will result in a larger opening area in the second welding area 321, affecting the structural strength and rigidity of the second welding area 321, and affecting the connection reliability of the first conductive element 31 and the second conductive element 32. Optionally, D is 4mm.

[0074] In the above technical solution, the second welding area 321 and the first welding area 312 are of equal size and shape. This allows the second welding area 321 and the first welding area 312 to be fully welded together by solder 33, reducing the risk of unwelded areas between the two areas. This also helps to reduce the size of the first conductive component 31 and the second conductive component 32, improving space utilization. By setting the diameter of the through hole 322 and the width of the first welding area 312 within the above-mentioned range, it is possible to ensure that the through hole 322 has suitable dimensions and that it has a high gas venting effect while ensuring that the second conductive component 32 has high strength and rigidity, thereby improving the connection reliability of the first conductive component 31 and the second conductive component 32.

[0075] In some embodiments of this application, reference is made to Figure 6The center distance between any two adjacent holes 322 is L2, where D≤L2≤2D.

[0076] L2 can be, but is not limited to, D, 1.2D, 1.4D, 1.6D, 1.8D, 2D, etc. If the center distance between any two adjacent through holes 322 is less than D, the two through holes 322 will intersect, affecting the structural strength and rigidity of the second conductive element 32. If the center distance between any two adjacent through holes 322 is greater than 2D, this will result in a more scattered distribution of the through holes 322 in the second direction Y, and a larger gas exhaust path between any two adjacent through holes 322, which is not conducive to gas exhaust and affects the welding bubble rate between the first conductive element 31 and the second conductive element 32.

[0077] In the above technical solution, by setting the center distance between any two adjacent through holes 322 within the above range, the through holes 322 can be distributed relatively evenly without the two through holes 322 being drilled through. This not only improves the gas discharge efficiency at the location of the second conductive element 32, but also enables the second conductive element 32 to have high structural strength and rigidity, thereby enabling the second conductive element 32 and the first conductive element 31 to have high connection reliability after welding.

[0078] In some embodiments of this application, 2mm ≤ L2 ≤ 8mm. L2 can be, but is not limited to, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc. Optionally, L2 is 8mm.

[0079] In the above technical solution, by setting L2 within the above range, a suitable parameter value can be provided for the center distance between any two adjacent through holes 322, which is beneficial to meet different usage requirements.

[0080] In some embodiments of this application, reference is made to Figure 6 The minimum distance between two corresponding through holes 322 in any two adjacent second welding areas 321 is L3, where 2mm≤L3≤5mm.

[0081] The minimum distance between two corresponding through holes 322 in any two adjacent second welding areas 321 can refer to the interval between the outer contours of the two through holes 322. See details. Figure 6 L3 can be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Optionally, L3 is 4.5mm.

[0082] In the above technical solution, by setting the minimum distance between the two corresponding through holes 322 in any two adjacent second welding areas 321 within the above range, the through holes 322 and the edge of the second welding area 321 can be kept at a suitable distance, which is beneficial to make the second welding area 321 have strong strength and rigidity after the through holes 322 are opened.

[0083] In some embodiments of this application, reference is made to Figure 6 The second conductive element 32 has a first edge 323 located at both ends of the first direction X and a second edge 324 located in the second direction Y. The distance between the second welding area 321 near the first edge 323 and the first edge 323 is L4, where 2mm≤L4≤5mm. Among the multiple through holes 322 of each second welding area 321, the one near the second edge 324 is the edge hole. The distance between the edge hole and the adjacent second edge 324 is L5, where 2mm≤L5≤5mm.

[0084] It is understood that L4 can be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Optionally, L4 is 2mm. If L4 is less than 2mm, the distance between the outermost second welding area 321 and the first edge 323 in the first direction X is small, which affects the welding bond between the solder 33 and the second welding area 321 and the first welding area 312. If L4 is greater than 5mm, it will increase the size of the second conductive element 32 in the first direction X.

[0085] L5 can be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Optionally, L5 is 2mm. If L5 is less than 2mm, the distance between the outermost through hole 322 and the second edge 324 in the second direction Y is small, which will reduce the strength and rigidity of the second conductive element 32 in the area between the through hole 322 and the second edge 324, affecting the connection reliability between the second conductive element 32 and the first conductive element 31. If L5 is greater than 5mm, the size of the second conductive element 32 in the second direction Y will be increased.

[0086] In the above technical solution, by setting the distance L4 between the second welding area 321 and the first edge 323 within the aforementioned range, the welding reliability of the solder 33 between the second welding area 321 and the first welding area 312 can be improved, while also reducing the size of the second conductive element 32 in the first direction X. By setting the distance L5 between the outermost through hole 322 and the second edge 324 within the aforementioned range, the influence of the outermost through hole 322 on the strength and rigidity of the second conductive element 32 can be reduced, and the size of the second conductive element 32 in the second direction Y can be reduced.

[0087] Reference Figures 3 to 6This application provides an electrical connection assembly 30, including a first conductive element 31 and a second conductive element 32. The first conductive element 31 is a solder pad and has multiple solder mask bridges 311. The multiple solder mask bridges 311 are arranged at equal intervals along a first direction X. Each solder mask bridge 311 is a strip extending along a second direction Y, which is perpendicular to the first direction X. The multiple solder mask bridges 311 divide the first conductive element 31 into multiple first soldering areas 312 along the first direction X. The width of each first soldering area 312 in the first direction X is 8 mm, and the width of each solder mask bridge 311 in the first direction X is 0.5 mm. The second conductive element 32 is a metal busbar and has multiple second soldering areas 321. The multiple second soldering areas 321 and the multiple first soldering areas 312 correspond one-to-one and are equal in size and shape. Each second soldering area 321 has multiple through holes 322, which are arranged at equal intervals along the second direction Y. Each first soldering area 321 is soldered to the corresponding first soldering area 312 by solder 33. Among them, the through hole 322 is a round hole with a diameter of 4mm, and the center distance between any two adjacent through holes 322 in each second welding area 321 is 8mm.

[0088] This application also provides a battery device 100, including an electrical connection component 30 as described in any of the preceding embodiments.

[0089] In the above technical solution, since the electrical connection component 30 has high welding reliability, the battery device 100 using the electrical connection component 30 also has high reliability.

[0090] This application also provides an electrical device 1000, including a battery device 100 as described in the previous embodiments.

[0091] In the above technical solution, since the battery device 100 has high reliability, the power supply device 1000 using the battery device 100 also has high reliability.

[0092] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrical connection assembly, characterized in that, include: A first conductive element, the surface of which is provided with a plurality of solder resist bridges, the plurality of solder resist bridges being spaced apart along a first direction and protruding relative to the surface, so that the surface forms a plurality of first welding areas; The second conductive component has multiple second welding areas, which are spaced apart along the first direction and correspond one-to-one with multiple first welding areas. A solder resist bridge is provided between any two adjacent second welding areas. Each second welding area has a through hole, and each second welding area is welded to the corresponding first welding area by solder.

2. The electrical connection assembly according to claim 1, characterized in that, The plurality of the weld bridges are arranged at equal intervals along the first direction and are strips extending along a second direction perpendicular to the first direction.

3. The electrical connection assembly according to claim 2, characterized in that, In the first direction, the width of the weld bridge is H, where 0.125mm ≤ H ≤ 1mm.

4. The electrical connection assembly according to claim 3, characterized in that, In the first direction, the width of the first welding area is L1, where 2mm≤L1≤8mm.

5. The electrical connection assembly according to any one of claims 2 to 4, characterized in that, Multiple second welding zones are equally spaced along the first direction and are strip-shaped extending along the second direction, which is perpendicular to the first direction. Each second welding zone is provided with multiple through holes, which are spaced apart along the second direction.

6. The electrical connection assembly according to claim 5, characterized in that, The second welding area and the corresponding first welding area have their orthographic projections on the surface coincide. In the first direction, the width of the first welding area is L1, and the through hole is a circular hole with a diameter of D, wherein 0.4L1≤D≤0.6L1.

7. The electrical connection assembly according to claim 6, characterized in that, The center distance between any two adjacent holes in the plurality of holes is L2, where D≤L2≤2D.

8. The electrical connection assembly according to claim 7, characterized in that, 2mm≤L2≤8mm.

9. The electrical connection assembly according to claim 8, characterized in that, The minimum distance between two corresponding through holes in any two adjacent second welding areas is L3, where 2mm≤L3≤5mm.

10. The electrical connection assembly according to claim 8, characterized in that, The second conductive element has a first edge located at both ends of the first direction and a second edge located in the second direction. The distance between the second welding area near the first edge and the first edge is L4, where 2mm≤L4≤5mm. Among the plurality of through holes in each second welding area, the one closest to the second edge is an edge hole, and the distance between the edge hole and the adjacent second edge is L5, wherein 2mm≤L5≤5mm.

11. A battery device, characterized in that, Includes the electrical connection component as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

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