busbar

Abstract

This utility model relates to a busbar, including a busbar area and multiple welding pins; the welding pins are correspondingly arranged with the solder strips in the battery string; the welding pins include a current-guiding layer and a welding layer covering the current-guiding layer; the welding pins are connected to the corresponding solder strips in the battery string through the welding layer, and are connected to the busbar area through the current-guiding layer. Using the above-mentioned busbar can improve the reliability and safety of photovoltaic modules.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic manufacturing technology, and in particular to a busbar. Background Technology

[0002] With the development of photovoltaic manufacturing technology, the busbar has emerged as a component used to collect the current generated by multiple cells or cell strings and transmit it to the junction box or external circuit. It is the core component for current transmission inside photovoltaic modules.

[0003] In traditional technology, busbars are typically designed as regular elongated strips. While this design is simple in structure and easy to manufacture, it has certain limitations in practical applications. Because the connection between the regular elongated busbars and the solder strips in the battery string is relatively concentrated, during the welding process, if there is a deviation in the welding operation or inadequate insulation between the busbar and the solder strip, accidental contact can easily occur between adjacent welding points or between the busbar and other conductive components, leading to a short circuit and affecting the normal operation and safety of the photovoltaic module. Utility Model Content

[0004] Therefore, it is necessary to provide a busbar to address the poor security issues in traditional technologies.

[0005] A busbar includes a bus region and multiple solder pins;

[0006] The welding pins are configured to correspond to the solder strips in the battery string;

[0007] The welding pin includes a current-guiding layer and a welding layer covering the current-guiding layer; the welding pin is connected to the corresponding solder strip in the battery string through the welding layer, and is connected to the busbar area through the current-guiding layer.

[0008] In one embodiment, the battery string includes an adjacent first battery string and a second battery string;

[0009] The bus region includes a bus layer and an insulating layer covering the bus layer;

[0010] The bus layer connects to the welding layer; the insulating layer overlaps the first battery string and the second battery string.

[0011] In one embodiment, the plurality of soldering pins are disposed on both sides of the busbar area and are respectively used to connect the first solder strip in the first battery string and the second solder strip in the second battery string.

[0012] In one embodiment, the first battery string and the second battery string are battery strings with the same solder strip structure;

[0013] The plurality of welding pins are arranged symmetrically with the center line of the busbar area as the axis of symmetry.

[0014] In one embodiment, the plurality of solder pins are disposed on one side of the bus region;

[0015] The welding layer includes a first welding layer disposed on one side of the flow guiding layer and a second welding layer disposed on the other side of the flow guiding layer;

[0016] The welding pins are connected to the corresponding solder strips in the first battery string through the first welding layer, and to the corresponding solder strips in the second battery string through the second welding layer.

[0017] In one embodiment, the thickness of the choke layer is greater than the thickness of the guide layer.

[0018] In one embodiment, the width of the busbar region in the flow direction is greater than the width of the solder pin in the flow direction; the flow direction refers to the direction in which the end of the solder pin points towards the busbar region.

[0019] In one embodiment, the welding pins correspond one-to-one with the solder strips, or the same number of solder strips are spaced between two adjacent welding pins.

[0020] In one embodiment, the welding pin is divided into multiple segments, with adjacent segments connected by a flexible conductive strip.

[0021] In one embodiment, the insulating layer is a double-layer composite structure.

[0022] In the aforementioned busbar, the welding pins correspond to the solder strips in the battery string, with each welding pin existing independently and maintaining a safe distance from each other. Specifically, the welding pin includes a current-guiding layer and a welding layer covering the current-guiding layer. The welding pin connects to the corresponding solder strip in the battery string through the welding layer, and connects to the busbar area through the current-guiding layer. This structure allows current to be accurately and orderly conducted from the solder strip through the welding pin to the busbar area, avoiding current chaos during conduction. Furthermore, because each welding pin is independent and spaced apart, even slight deviations during welding operations are unlikely to cause short circuits between adjacent welding pins. This design also facilitates more precise insulation treatment of each welding point, further reducing the risk of short circuits. Therefore, this heterogeneous busbar with multiple pins can better prevent short circuits, improving the reliability and safety of photovoltaic modules. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the busbar in one embodiment;

[0024] Figure 2 This is a schematic diagram of the busbar connecting to two battery strings in one embodiment;

[0025] Figure 3 This is a structural diagram of the busbar in one embodiment;

[0026] Figure 4 This is a structural diagram of the busbar in another embodiment;

[0027] Figure 5 A schematic cross-sectional view of the busbar in another embodiment;

[0028] Figure 6 This is a schematic diagram of a busbar connected to a battery string in one embodiment.

[0029] Explanation of reference numerals in the attached diagram: 10-Channel area; 11-Channel layer; 12-Insulating layer; 20-Solder pin; 21-Conducting layer; 22-Solder layer; 221-First solder layer; 222-Second solder layer. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly 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.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] As described in the background section, in traditional technologies, busbars typically employ a regular, elongated design. While this design is simple in structure and easy to manufacture, it has certain limitations in practical applications. Because the connection between the regular, elongated busbar and the solder strips in the battery string is relatively concentrated, during the welding process, if there is a deviation in the welding operation or inadequate insulation between the busbar and the solder strip, accidental contact can easily occur between adjacent welding points or between the busbar and other conductive components, leading to a short circuit and affecting the normal operation and safety of the photovoltaic module.

[0037] For the reasons mentioned above, such as Figure 1 As shown, a busbar is proposed, including a bus region 10 and a plurality of solder pins 20 ( Figure 1(A cross-sectional schematic diagram of a busbar and a solder pin); the solder pin 20 is set to correspond to the solder strip in the battery string; the solder pin 20 includes a current guiding layer 21 and a solder layer 22 covering the current guiding layer 21; the solder pin 20 is connected to the corresponding solder strip in the battery string through the solder layer 22, and is connected to the busbar 10 through the current guiding layer 21.

[0038] In photovoltaic (PV) modules, the busbar is a crucial component for collecting and transmitting current. It gathers the current generated by multiple cell strings and transmits it to the junction box or external circuitry, serving as the "main artery" for current conduction within the PV module and playing a vital role in the module's output performance and stability. The busbar area 10 is a dedicated area on the busbar for collecting current. It typically has a large conductive area, capable of accommodating the current conducted from multiple solder pins 20 and integrating it for unified output, ensuring smooth current transmission. Solder pins 20 are the parts of the busbar that connect to the solder ribbons in the cell strings. Each solder pin 20 corresponds to a solder ribbon, guiding the current on the ribbon to the busbar area 10. The design and manufacturing quality of the solder pins 20 directly affect the efficiency and reliability of current transmission. A cell string is a module unit composed of multiple PV cells connected in series via solder ribbons. The cell string is the basic component of a PV module, its function being to convert light energy into electrical energy and output the generated current through the solder ribbons. A welding layer 22 is provided on the welding pin 20 so that it can be welded to the welding strip and the current is guided to the busbar 11 through the current guiding layer 21. There is an electrical connection between the welding layer 22, the current guiding layer 21 and the busbar 11, so that the current on the welding strip can be collected. The welding pin 20 is connected to the positive or negative terminal of the battery string respectively.

[0039] Solder ribbon is a conductive strip that connects photovoltaic cells. It is usually made of copper or other metals with good conductivity, and its surface may be coated with materials such as tin to improve soldering performance. The solder ribbon draws the current generated by the cell from the cell surface and transmits it to the solder pins 20.

[0040] The current-conducting layer 21 is the internal layer in the solder pins 20 responsible for conducting current. It is typically made of a highly conductive metal, such as copper, which enables rapid and efficient current conduction from the solder layer 22 to the busbar 10, reducing resistance loss during current transmission. The solder layer 22 is a layer covering the surface of the current-conducting layer 21 and is used for soldering connections with the solder strips in the battery string. The solder layer 22 usually has good solderability, forming a strong solder joint with the solder strip to ensure stable current transmission. Simultaneously, the solder layer 22 also provides some protection, preventing the current-conducting layer 21 from being corroded by the external environment. For example, the solder layer 22 and the current-conducting layer 21 are arranged sequentially along the height direction.

[0041] Specifically, in the manufacturing of photovoltaic modules, the design and performance of busbars are crucial. Traditional busbar designs may have some limitations, such as high resistance loss and insufficient welding reliability during current collection and transmission. To address these issues, a novel busbar structure is proposed. This busbar mainly consists of a current collection area 10 and multiple welding pins 20. The current collection area 10, as the core area for current collection, is designed in size and shape according to the power requirements and current magnitude of the module to ensure efficient current collection and transmission. The multiple welding pins 20 are arranged according to the arrangement of the solder strips in the cell string, with each welding pin 20 precisely corresponding to a solder strip, thereby achieving accurate current conduction.

[0042] The solder pin 20 is a key component of this busbar, consisting of a current-conducting layer 21 and a solder layer 22 covering the surface of the current-conducting layer 21. The current-conducting layer 21 is made of a highly conductive metal, such as copper, and its thickness and width are carefully designed to minimize material usage and cost while ensuring sufficient conductivity. The solder layer 22 is made of a material with good solderability, such as tin-plated copper, and is applied to the surface of the current-conducting layer 21 using a special process. During the soldering process, the solder layer 22 bonds tightly to the solder strips in the battery string, forming a strong solder joint that ensures stable current transmission from the solder strips to the solder pin 20. Simultaneously, the current-conducting layer 21 rapidly conducts the current received at the solder pin 20 to the busbar area 10, achieving efficient current collection and transmission.

[0043] This novel busbar design offers several advantages. First, precise pin placement ensures accurate current transmission from each battery string to the busbar area, preventing current congestion and losses and improving module output efficiency. Second, the conductive and soldering layer structures of the pins enhance soldering reliability and stability, reducing issues like increased resistance and overheating caused by poor soldering, thus extending module lifespan. Furthermore, this busbar structure offers flexibility, allowing for adjustments and optimization based on different module designs and power requirements.

[0044] In the aforementioned busbar, the welding pins 20 are correspondingly positioned to correspond to the solder strips in the battery string. Each welding pin 20 exists independently and maintains a certain safe distance from each other. Specifically, the welding pin 20 includes a current-conducting layer 21 and a welding layer 22 covering the current-conducting layer 21. The welding pin 20 is connected to the corresponding solder strip in the battery string through the welding layer 22, and is connected to the busbar area 10 through the current-conducting layer 21. This structure allows current to be accurately and orderly conducted from the solder strip through the welding pins 20 to the busbar area 10, avoiding current chaos during conduction. In addition, since each welding pin 20 is independent and spaced apart, even slight deviations during welding operations are unlikely to cause short circuits between adjacent welding pins 20. At the same time, this design also facilitates more precise insulation treatment of each welding point, further reducing the risk of short circuits. Therefore, this heterogeneous busbar with multiple pins can better avoid circuit short circuits and improve the reliability and safety of photovoltaic modules.

[0045] In one embodiment, such as Figure 2 As shown, the battery string includes an adjacent first battery string a and a second battery string b; the busbar region 10 includes a busbar layer 11 (not shown in the figure) and an insulating layer 12 covering the busbar layer 11; the busbar layer 11 is connected to a welding layer 22; the insulating layer 12 overlaps the first battery string a and the second battery string b.

[0046] In this context, the first and second cell strings refer to two adjacent cell strings arranged within a photovoltaic module. They are spatially adjacent and may influence or cooperate with each other in their circuit connections, jointly contributing to the overall power output of the module. The busbar layer 11 is the core component of the busbar region 10 responsible for conducting current. It is typically made of highly conductive metallic materials (such as copper or aluminum), possessing a large conductive area and excellent conductivity, enabling it to quickly and efficiently collect and transmit current from multiple cell strings.

[0047] The insulating layer 12 is a non-conductive material layer covering the surface of the busbar layer 11. Its main function is to prevent the busbar layer 11 from accidentally coming into contact with other conductive components (such as battery strings, other metal components, etc.), thereby avoiding faults such as short circuits and ensuring the safe operation of the photovoltaic module.

[0048] Specifically, in the prior art, busbars are generally placed in the gaps between adjacent battery strings to collect the current between adjacent battery strings. However, in order to improve the efficiency of the module, the spacing between the battery cells and the spacing between the battery cells and the busbars may be reduced, and the busbars may be hidden. That is, the busbars may be connected to the first battery string and the second battery string, thereby reducing the spacing between the first battery string and the second battery string.

[0049] Furthermore, the bus layer 11, being the main channel for current conduction, is made of a highly conductive metal material with a large cross-sectional area, capable of withstanding large currents. The bus layer 11 is connected to the solder layers 22 of each solder pin 20, which in turn are soldered to the solder strips in the first and second battery strings. In this way, the current generated by the first and second battery strings can be conducted to the bus layer 11 through the solder strips and solder pins 20. The insulating layer 12 is a crucial barrier ensuring the safe operation of the module. It tightly covers the surface of the bus layer 11 and overlaps between the first and second battery strings. The presence of the insulating layer 12 effectively prevents accidental contact between the bus layer 11 and the battery strings or other conductive components, avoiding safety hazards caused by short circuits. Simultaneously, the insulating layer 12 also possesses a certain mechanical strength, maintaining its insulation performance under different environmental conditions, ensuring the long-term stable operation of the module.

[0050] The busbar structure design used in this embodiment not only improves the efficiency and stability of current collection but also greatly enhances the safety of the module. Through precise soldering pin 20 placement and a well-designed insulation layer 12, accurate current transmission and effective isolation are achieved, providing a strong guarantee for the high performance and high reliability of the photovoltaic module.

[0051] In one embodiment, such as Figure 2 and Figure 3 As shown, multiple soldering pins are arranged on both sides of the busbar area, respectively for connecting the first solder strip in the first battery string and the second solder strip in the second battery string.

[0052] The first solder strip refers to the solder strip in the first battery string, and the second solder strip is the solder strip in the second battery string.

[0053] Specifically, multiple solder pins 20 are arranged on both sides of the busbar area 10, ensuring that each solder pin 20 has its specific connection target. One side of the solder pin 20 is dedicated to connecting to the first solder strip in the first battery string, while the other side connects to the second solder strip in the second battery string. This arrangement of solder pins 20 on both sides makes the busbar structure more compact and rational. Within a limited space, the space on both sides of the busbar area 10 can be fully utilized to arrange the solder pins 20, avoiding mutual interference and crowding between them. This layout not only facilitates the installation and layout of the components but also reduces the internal space occupied by the components, improving space utilization. Simultaneously, the rational structural layout also helps improve the heat dissipation performance of the components because the current transmission path is smoother, reducing the possibility of localized heat generation. Furthermore, using the busbar structure in this embodiment, two adjacent battery strings can be connected simultaneously without requiring a connection between adjacent battery strings.

[0054] In one embodiment, such as Figure 2 As shown, the first battery string a and the second battery string b are battery strings with the same solder strip structure; multiple solder pins 20 are symmetrically arranged with the center line of the busbar 10 as the axis of symmetry.

[0055] In the design of the busbar, the center line of the busbar area 10 is a reference line that divides the busbar area 10 symmetrically to the left and right.

[0056] Specifically, in the manufacturing of photovoltaic modules, the layout of the cell strings and the design of the busbars are crucial to the performance and reliability of the modules. Here, we consider adjacent first and second cell strings that have the same solder strip structure. This identical design allows for standardized processes and equipment during the production of the cell strings, reducing production costs and facilitating subsequent assembly and maintenance.

[0057] As the core component for current collection, the busbar has multiple solder pins 20. These solder pins 20 are symmetrically arranged about the center line of the busbar area 10. Specifically, the center line of the busbar area 10 divides the busbar area 10 into two symmetrical parts, and the multiple solder pins 20 are evenly distributed on both sides of the center line, with the solder pins 20 on both sides corresponding to each other in number, position and structure.

[0058] In the actual component assembly process, the solder ribbons of the first and second battery strings are soldered to the solder pins 20 symmetrically arranged on both sides of the busbar. The symmetrical arrangement of the solder pins 20 makes the current transmission from the first and second battery strings to the busbar 10 more balanced and stable. At the same time, this symmetrical design facilitates automated operation in the production process, improving production efficiency and product quality.

[0059] For example, to facilitate connections between different polarities of different battery strings, the busbar can also be an asymmetrical structure.

[0060] In one embodiment, such as Figure 4 and Figure 5 As shown, multiple solder pins are disposed on one side of the busbar area; the solder layer 22 includes a first solder layer 221 disposed on one side of the current guiding layer 21 and a second solder layer 222 disposed on the other side of the current guiding layer 21; the solder pins 20 are connected to the corresponding solder strips in the first battery string through the first solder layer 221 and to the corresponding solder strips in the second battery string through the second solder layer 222.

[0061] Among them, such as Figure 5As shown, the welding layer 22 includes a first welding layer 221 disposed on one side of the current guiding layer 21 and a second welding layer 222 disposed on the other side of the current guiding layer 21. The welding pin 20 is connected to the corresponding solder strip in the first battery string through the first welding layer 22 and to the corresponding solder strip in the second battery string through the second welding layer 22. That is, the bus bar in this embodiment can combine the current of the two battery strings located above and below the bus bar.

[0062] In this embodiment, multiple welding pins 20 are concentrated on one side of the busbar area 10, greatly saving space in the busbar strip. This compact layout makes the overall structure of the photovoltaic module more compact, reduces the internal space occupied by the module, and helps to improve the power density of the module. Within a limited space, more cell strings can be accommodated or more efficient current collection can be achieved, enabling the module to output higher power at the same size, meeting the market demand for high-efficiency photovoltaic modules.

[0063] In one embodiment, the thickness of the busbar layer 11 is greater than the thickness of the guide layer 21.

[0064] Specifically, the busbar 11, as a key component for collecting current from multiple battery strings, undertakes a significant current transmission task. Increasing its thickness is equivalent to increasing its cross-sectional area, which can significantly reduce resistance and improve the power generation efficiency of the photovoltaic system. For example, the thickness of the busbar can be 0.05mm-0.2mm.

[0065] In one embodiment, the width of the busbar 10 in the flow direction is greater than the width of the solder pin 20 in the flow direction.

[0066] The direction of current flow refers to the direction in which the end of the welding pin 20 points towards the busbar area 10.

[0067] Specifically, a wider busbar region 10 is structurally more robust and can better withstand the electrodynamic and thermal stresses generated during current transmission. That is, increasing the width of the busbar region 10 disperses the points of application of these stresses, reducing stress concentration and damage to the busbar region 10 and the solder pins 20. For example, under severe weather conditions such as strong winds and heavy snow, photovoltaic modules may be subjected to significant external forces, leading to unstable current transmission. A wider busbar region 10 can better maintain structural integrity, ensure normal current transmission, and improve the reliability of the module in complex environments. For example, the width of the busbar region 10 in the current-conducting direction can be, for example, 2mm-50mm, and the width of the solder pins 20 in the current-conducting direction can be 2mm-20mm.

[0068] In one embodiment, such as Figure 6 As shown, the solder pins correspond one-to-one with the solder strips, or the same number of solder strips are spaced between two adjacent solder pins.

[0069] Specifically, because each solder pin 20 is connected to the solder ribbon in the same way, the current transmission characteristics at each connection point tend to be consistent. This makes the electrical performance of the entire module more stable and uniform. Furthermore, in photovoltaic systems, multiple modules need to be used in series or parallel. Modules with consistent electrical performance can work together better, reducing the "weakest link" effect caused by differences in module performance, and improving the power generation efficiency and stability of the entire system. For example, in a photovoltaic array composed of multiple modules, a module array using a one-to-one connection method has a smaller fluctuation range in output power and more stable power generation.

[0070] In one embodiment, the welding pin 20 is divided into multiple segments, and adjacent segments are connected by a flexible conductive strip.

[0071] Specifically, since the solder strips of the battery string may break due to stress during lamination or use, the flexible conductive strip (such as tin-plated copper foil) can absorb deformation and reduce the risk of breakage (fatigue life ≥ (sub-cycle), therefore, the welding pins 20 of the busbar can be designed in segments, with each segment of welding pin 20 being 5mm-15mm in length. Adjacent segments are connected by a flexible conductive strip with a thickness of 0.1mm-0.3mm to accommodate the bending or thermal expansion of the battery string.

[0072] In one embodiment, the insulating layer 12 is a double-layer composite structure.

[0073] Specifically, a single-layer insulation material may not be able to simultaneously achieve both temperature resistance and UV resistance. However, designing the insulation layer 12 as a double-layer composite structure allows it to withstand high temperatures of 250°C and 20 years of outdoor aging (fluorocarbon coating). For example, the insulation layer 12 can also be an adhesive. In this embodiment, the thickness of the insulation layer 12 is generally 0.01mm-2mm.

[0074] In one embodiment, the primary function of the current-conducting area is to guide the current from the solder strip, and it is mainly composed of conductive materials such as copper, aluminum, and silver. A first solder layer and a second solder layer are located on either side of the current-conducting area. This symmetrical arrangement ensures effective soldering even if the busbar is flipped. The first and second solder layers are typically soldering metals such as tin and lead. Additionally, the current-conducting area collects the current from the solder strip gathered from the solder pins. The insulating layer provides electrical insulation between the busbar and the battery cells and solder strip, ensuring normal current transmission.

[0075] In addition, when the busbar is in operation, it can be placed directly on the target photovoltaic cell so that the welding pins correspond one-to-one with the target solder strip, and then they can be welded together to achieve the collection of photovoltaic cell / string current.

[0076] Optionally, if the busbar has a symmetrical structure, then its welding effect is as follows: Figure 2 As shown, the busbars are connected to the solder strips on the first and second battery strings respectively, completing the busing of the battery strings on both sides.

[0077] In some exemplary examples, an intermediate transition layer is provided between the flow guide layer and the welding layer.

[0078] In some exemplary examples, at least a portion of the overlapping area between the busbar and the adjacent battery string is provided with an embossed structure or a microporous array.

[0079] In some exemplary examples, at least a portion of the solder pins have a raised surface structure to form a localized molten zone during soldering.

[0080] In some exemplary examples, the merge zone is provided with at least one temperature sensor mounting hole for embedding a temperature sensor to monitor the temperature of the merge zone in real time.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A busbar, characterized in that, Includes a busbar and multiple solder pins; The welding pins are configured to correspond to the solder strips in the battery string; The welding pin includes a current-guiding layer and a welding layer covering the current-guiding layer; the welding pin is connected to the corresponding solder strip in the battery string through the welding layer, and is connected to the busbar area through the current-guiding layer.

2. The busbar of claim 1, wherein The battery string includes an adjacent first battery string and a second battery string. The bus region includes a bus layer and an insulating layer covering the bus layer; The bus layer connects to the welding layer; the insulating layer overlaps the first battery string and the second battery string.

3. The busbar of claim 2, wherein, The plurality of welding pins are disposed on both sides of the busbar area and are used to connect the first solder strip in the first battery string and the second solder strip in the second battery string, respectively.

4. The busbar of claim 3, wherein The first battery string and the second battery string are battery strings with the same solder strip structure; The plurality of welding pins are arranged symmetrically with the center line of the busbar area as the axis of symmetry.

5. The busbar of claim 2, wherein The plurality of welding pins are disposed on one side of the busbar area; The welding layer includes a first welding layer disposed on one side of the flow guiding layer and a second welding layer disposed on the other side of the flow guiding layer; The welding pins are connected to the corresponding solder strips in the first battery string through the first welding layer, and to the corresponding solder strips in the second battery string through the second welding layer.

6. The busbar of claim 2, wherein The thickness of the flow-collecting layer is greater than the thickness of the flow-guiding layer.

7. The busbar of claim 2, wherein The insulating layer has a double-layer composite structure.

8. The busbar of claim 1, wherein The width of the busbar area in the flow direction is greater than the width of the welding pin in the flow direction; the flow direction refers to the direction in which the end of the welding pin points to the busbar area.

9. The busbar of any one of claims 1 to 8, wherein, The welding pins correspond one-to-one with the solder strips, or the same number of solder strips are spaced between two adjacent welding pins.

10. The busbar of any one of claims 1 to 8, wherein, The welding pins are divided into multiple segments, and adjacent segments are connected by a flexible conductive strip.

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