Conductive components, solar cell strings, and photovoltaic modules

Abstract

The present invention provides a conductive member, a solar cell string, and a solar cell module that can increase the adhesive strength between the conductive member and the fixed bonding point, ensure the reliability of the connection between the conductive member and the battery cell, avoid problems with dummy welding defects between the conductive member and the battery cell, and ensure the operational performance of the solar cell module. [Solution] The conductive member 130 has a plurality of welding regions 131 and a plurality of adhesive regions 132 on its outer circumference, the plurality of welding regions 131 and the plurality of adhesive regions 132 are arranged alternately along a first direction, and the conductive member 130 has a further plurality of soldering portions 135 on its outer circumference, the plurality of soldering portions 135 correspond to each of the plurality of welding regions 131, and each soldering portion 135 covers the conductive member 130 in the circumferential direction of the conductive member 130 in the welding region 131 with at least a portion thereof.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic power generation, and particularly relates to conductive members, solar cell strings, and photovoltaic modules.

Background Art

[0002] As the technology of photovoltaic modules has been constantly developing, the number of cell busbars has changed with MBB (Multi-Busbar) and SMBB (i.e., Super MBB). The multi-busbar technology of photovoltaic modules is a method to improve the design and manufacturing of cells in photovoltaic modules. Conventional photovoltaic modules usually use 2 to 5 busbar lines, while the multi-busbar technology can use 9 or more busbar lines.

[0003] The busbarless technology (abbreviated as 0BB) is currently a manufacturing technology for new photovoltaic modules to improve the efficiency of solar cells and reduce costs. In crystalline silicon solar cells, fingers are metal wires for collecting current, and usually, there are multiple busbars. The busbarless technology eliminates these busbars and uses more and thinner metal wires or conductive materials to collect current. The connection between the metal wire or conductive material and the cell is usually made by alloy connection such as metal welding, or non-alloy connection such as adhesive connection.

[0004] The previously used metal wires or conductive materials have no flux components on their surfaces, and generally, flux is sprayed on the busbars of cell. As the photovoltaic power generation technology has been constantly developing, the metal wires are becoming thinner and thinner, and the required flux components per wire are relatively less. At the same time, in order to avoid adverse effects such as flux residue caused by the inability to spray flux evenly on the cell, the method of immersing the entire metal wire in flux is gradually adopted, so that the surface of the metal wire has a soldering part to ensure the firmness and reliability of the alloy connection.

[0005] Current metal wires are suitable for multi-busbarcell processes because the solder joint is obtained using a method that involves immersion of the entire wire. However, when this method is used in the current 0BB bonding process, the following problems clearly arise: Specifically, when using metal wires with flux components on the entire surface, the acidic components present in the flux suppress the activity of the catalytic components in the adhesive, and the acidic components present in the flux form an alloy coating on the surface of the metal wire, reducing the adhesion between the adhesive and the metal wire.

[0006] As described above, when metal wires are used in the 0BB bonding process by obtaining flux through a method of complete immersion, it affects the robustness of the non-alloy connection, resulting in insufficient adhesion between the metal wire and the battery cell. Furthermore, it increases the likelihood of dummy welding defects between the metal wire and the battery cell, thus affecting the performance of the solar power generation module. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Based on this, there is a need to provide a conductive member, solar cell string, and solar cell module that can increase the adhesive strength between the conductive member and the fixed bonding point, thereby ensuring connection reliability between the conductive member and the battery cell, avoiding the problem of dummy welding defects between the conductive member and the battery cell, and ensuring the operational performance of the solar cell module, in response to the problem of insufficient adhesive strength between the metal wire and the battery cell caused by obtaining flux using the conventional method of immersing the entire metal wire and applying it to the busbarless bonding process of the battery cell. [Means for solving the problem]

[0008] A conductive member having a plurality of welding regions and a plurality of bonding regions on its outer circumference, wherein the plurality of welding regions and the plurality of bonding regions are arranged alternately along a first direction. The conductive member has a further plurality of soldering portions on its outer circumference, each of which corresponds to a plurality of welding regions, and each soldering portion covers the conductive member in the welding region with at least a portion of it along the circumferential direction of the conductive member.

[0009] In one embodiment of this application, the welding region is located at the end of the conductive member along the first direction such that the soldered portion is located at the end of the conductive member. Alternatively, the adhesive region is located at the end of the conductive member along the first direction.

[0010] In one embodiment of this application, the length of the welding region along the first direction is the same as and / or different from the length of the bonding region along the first direction. and / or, the lengths of each welding region along the first direction are the same and / or different. And / or, the lengths of each adhesive region along the first direction are the same and / or different.

[0011] In one embodiment of this application, the length of the welding region along the first direction is greater than the length of the bonding region along the first direction.

[0012] In one embodiment of this application, the conductive member is a conductive metal wire or a conductive metal strip. The diameter of the conductive member is 0.1 mm to 0.3 mm, or the longitudinal cross-sectional shape of the conductive member is an equilateral triangle, and the side length of the longitudinal cross-section of the conductive member is 0.1 mm to 0.3 mm.

[0013] In one embodiment of this application, the conductive member includes a conductive substrate and a metal coating layer, the metal coating layer covers the outside of the conductive substrate, The aforementioned soldered portion is covered with the metal coating layer along the circumferential direction, Each of the aforementioned soldering portions is provided in a liquid state, or each of the aforementioned soldering portions is provided in a solid state.

[0014] A solar cell string comprising a battery cell, an adhesive portion, and a conductive member as described in any one of the above technical features, The adhesive portion includes a plurality of fixing adhesive points, the plurality of fixing adhesive points are provided on the surface of the battery cell at intervals along a first direction, and the fixing adhesive points are provided corresponding to the adhesive area of ​​the conductive member. The conductive member is welded to the surface of the battery cell via a solder joint in the welding area, and the conductive member is adhesively connected to the fixing bonding point in the bonding area.

[0015] In one embodiment of this application, the length of the soldered portion along the first direction is less than or equal to the length of the welding region along the first direction. And / or, the length of the fixing point along the first direction is less than or equal to the length of the bonding area along the first direction.

[0016] In one embodiment of this application, the number of adhesive portions is multiple, and the multiple adhesive portions are provided on the surface of the battery cell at intervals along a second direction perpendicular to the first direction. The number of conductive members is multiple, and each adhesive portion is connected to one of the conductive members, and each conductive member has multiple soldering portions spaced apart.

[0017] In one embodiment of this application, the surface of the battery cell has conductive regions, a plurality of the conductive regions are provided on the surface of the battery cell at intervals along the first direction, and the conductive regions extend along a second direction perpendicular to the first direction. The conductive region corresponds to the welding region, and the soldering portion is used to weld the conductive member to the conductive region of the battery cell within the welding region. The fixed adhesive point is provided between two adjacent conductive regions.

[0018] In one embodiment of the present application, the battery cell has a plurality of conductive layers, with at least one conductive layer provided in each conductive region, the conductive layers extending along the second direction, and if at least two conductive layers are provided in the conductive region, at least two of the conductive layers are spaced apart along the first direction.

[0019] A photovoltaic module comprising a cover plate, a back plate, and a plurality of solar cell strings described in any one of the above technical features, wherein the plurality of solar cell strings are connected in series along a first direction. The cover plate and the back plate are provided on both sides of the solar cell string, and the cover plate, the back plate, and the solar cell string are packaged using a packaging process. [Effects of the Invention]

[0020] By adopting the above technical solution, this application has at least the following technical effects. The conductive member, solar cell string, and photovoltaic module of this application are provided with a plurality of welding areas and a plurality of bonding areas on the outer circumference of the conductive member, the plurality of welding areas and a plurality of bonding areas are arranged alternately on the conductive member along a first direction, and a plurality of soldering parts are provided in each welding area, so that the conductive member has soldering parts in the welding areas and no soldering parts in the bonding areas. When the conductive member is connected to a battery cell, the soldering parts weld and fix the conductive member to the surface of the battery cell in the welding area, and the conductive member is connected to the fixing bonding points in the bonding area, thereby fixing the conductive member to the battery cell by welding and bonding.

[0021] Thus, after the conductive member is fixed to the battery cell, the soldering portion helps the conductive member to be welded and fixed to the battery cell in the welding area, improving the robustness of the connection between the conductive member and the battery cell. Moreover, since the soldering portion of the conductive member does not contact the fixed adhesion point, the adhesive force between the conductive member and the fixed adhesion point is increased, ensuring the adhesive connection reliability between the conductive member and the battery cell. Further, it is ensured that there is sufficient tensile force between the conductive member and the battery cell, ensuring the connection reliability between the conductive member and the battery cell, avoiding the problem of poor dummy welding between the conductive member and the battery cell, and ensuring the use performance of the photovoltaic module.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic diagram of a solar cell string according to an embodiment of the present application. [Figure 2] It is a partial enlarged view of portion A of the solar cell string shown in FIG. 1. [Figure 3] It is a schematic diagram showing the correspondence between the conductive member, the battery cell, and the adhesive portion in the solar cell string shown in FIG. 2. [Figure 4] It is a schematic cross-sectional view along the first direction of the conductive member shown in FIG. 3. [Figure 5] It is a schematic diagram of a solar cell string according to another embodiment of the present application. [Figure 6] It is a partial enlarged view of portion B of the solar cell string shown in FIG. 5. [Figure 7] It is a schematic cross-sectional view along the first direction of one embodiment of the conductive member shown in FIG. 4. [Figure 8] It is a schematic diagram of another embodiment of the conductive member shown in FIG. 4.

Embodiments for Carrying Out the Invention

[0023] To make the above-mentioned objectives, features, and advantages of this application clearer and easier to understand, specific embodiments of this application will be described in detail below with reference to the drawings. Many specific details will be explained in the following description to make this application easier to understand. However, this application can be carried out in many other forms different from those described herein, and those skilled in the art can make similar improvements without departing from the content of this application, and therefore this application is not limited to the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that when terms such as "center," "vertical," "horizontal," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "perpendicular," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings and is merely for the purpose of facilitating and simplifying the description of this application. It does not indicate or imply that the device or element has a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limiting this application.

[0025] Furthermore, where the terms “first” and “second” appear, these terms are merely descriptive and should not be understood as indicating or implying relative importance or implicitly indicating the number of specified technical features. Thus, features limited by “first” and “second” may explicitly or implicitly include at least one such feature. Where the term “plural” appears in this description, “plural” means at least two, for example, two, three, etc., unless otherwise specified.

[0026] In this application, unless otherwise explicitly stated or limited, terms such as “attachment,” “connection,” “bonding,” and “fixing” should be understood in a broad sense. For example, a fixed connection may be a detachable connection, an integrated connection may be a mechanical connection, an electrical connection may be a direct connection, an indirect connection via an intermediary, or a communication between two elements or an interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0027] In this application, unless otherwise explicitly stated or limited, when there is a similar description such as the first feature being "above" or "below" the second feature, the meaning may be that the first and second features are in direct contact, or that they are indirectly in contact through an intervening material. Furthermore, the statement that the first feature is "above," "above," and "above" the second feature may also mean that the first feature is directly below or diagonally above the second feature, or simply that the horizontal height of the first feature is greater than that of the second feature. Similarly, the statement that the first feature is "below," "below," and "below the second feature" may also mean that the first feature is directly below or diagonally above the second feature, or simply that the horizontal height of the first feature is greater than that of the second feature.

[0028] It should be noted that when an element is referred to as "fixed" or "installed" to another element, it may be directly connected to the other element, or an intermediate element may be present simultaneously. It should be noted that when an element is referred to as "connected" to another element, it may be directly connected to the other element, or an intermediate element may be present simultaneously. Where present, the terms “vertical,” “horizontal,” “up,” “down,” “left,” “right,” and similar expressions used in this application are for illustrative purposes only and do not represent only the two embodiments.

[0029] To understand this, busbarless technology (abbreviated as 0BB) collects current using more and thinner metal wires or conductive materials. It employs a method of immersing the entire metal wire in flux, creating solder joints on the surface of the metal wire to ensure a strong and reliable alloy connection. However, when using metal wires with flux components covering the entire surface, the acidic components in the flux suppress the activity of the catalytic components in the adhesive. Furthermore, the acidic components in the flux form an alloy coating on the surface of the metal wire, reducing the adhesion between the adhesive and the metal wire. This results in insufficient adhesion between the metal wire and the battery cell, and is prone to dummy welding defects between the metal wire and the battery cell, affecting the performance of the solar power module.

[0030] Referring to Figures 1 to 4, this application provides a conductive member 130. Figure 1 is a schematic diagram of a solar cell string 100 according to one embodiment of this application, Figure 2 is a partially enlarged view of location A of the solar cell string 100 shown in Figure 1, and Figure 4 is a schematic cross-sectional view of the conductive member shown in Figure 3 along the first direction. The conductive member 130 can be applied to the solar cell string 100, and after the solar cell string 100 is connected to each other and then packaged using a packaging process, a photovoltaic module (not shown) can be formed.

[0031] The conductive member 130 of this application avoids the soldering portion 135 suppressing the activity of the catalyst component at the fixed bonding point 121, increases the adhesive force between it and the fixed bonding point 121, thereby ensuring the reliability of the welded connection between the conductive member 130 and the battery cell 110, and further ensures that sufficient tensile force exists between the conductive member 130 and the battery cell 110, thereby ensuring the reliability of the connection between the conductive member 130 and the battery cell 110, avoiding the problem of dummy welding defects between the conductive member 130 and the battery cell 110, and ensuring the usable performance of the solar power generation module.

[0032] To better explain the specific structure of the conductive member 130, the structure of the solar cell string 100 will be described first. The solar cell string 100 includes a battery cell 110, an adhesive portion 120, and the conductive member 130 according to this application. The adhesive portion 120 includes a plurality of fixing adhesive points 121, which are provided on the surface of the battery cell 110 at intervals along a first direction. The conductive member 130 can be welded to the surface of the battery cell 110, and the conductive member 130 can be further bonded to the surface of the battery cell 110 via the fixing adhesive points 121.

[0033] The battery cell 110 is manufactured from a silicon substrate and is used to absorb solar energy and convert it into electricity. The specific structure and principle of the battery cell 110 are prior art and will not be described in detail here. The battery cell 110 extends along a first direction and a second direction. As shown in Figures 1 and 2, the first direction is perpendicular to the second direction, the first direction is the length direction of the battery cell 110, and the second direction is the width direction of the battery cell 110. The battery cell 110 has a constant length dimension along the first direction and a constant width dimension along the second direction.

[0034] The conductive member 130 is provided on the surface of the battery cell 110 along a first direction, and alloy and non-alloy connections are employed between the conductive member 130 and the battery cell 110 to ensure sufficient tensile force between the conductive member 130 and the battery cell 110, and further ensure connection reliability between the conductive member 130 and the battery cell 110. An adhesive portion 120 is provided on the surface of the battery cell 110, and the conductive member 130 and the adhesive portion 120 are fixed by an adhesive connection, thereby realizing a non-alloy connection between the conductive member 130 and the battery cell 110. The area of ​​the conductive member 130 other than the area corresponding to the adhesive portion 120 and the battery cell 110 are welded together to realize an alloy connection between the conductive member 130 and the battery cell 110.

[0035] Specifically, the adhesive portion 120 is provided on the surface of the battery cell 110 along a first direction, the conductive member 130 is provided on the adhesive portion 120, and the portion of the conductive member 130 excluding the area corresponding to the adhesive portion 120 is welded to the battery cell 110 to realize an electrical connection between the conductive member 130 and the battery cell 110. To make it clear, the battery cell 110 has a front and back that are opposite to each other, and in Figures 1 and 3, only the front of the battery cell 110 is shown, and the back of the battery cell 110 is not shown.

[0036] Furthermore, both the front and back surfaces of the battery cell 110 have adhesive portions 120, and each adhesive portion 120 fixes one conductive member 130. In other words, conductive members 130 are provided on both the top (front) and bottom (back) surfaces of the battery cell 110, and the conductive members 130 are fixed to the surface of the battery cell 110 by corresponding adhesive portions 120 and welding connections. The principle of connection between the top surface of the battery cell 110 and the conductive member 130 is substantially the same as the principle of connection between the bottom surface and the conductive member 130, and the connection between the surface of the battery cell 110 and the conductive member 130 will be explained below as an example.

[0037] The adhesive portion 120 is provided on the surface of the battery cell 110, and the conductive member 130 is adhesively connected to the adhesive portion 120 and welded to the area of ​​the battery cell 110 other than the adhesive portion 120. In this way, the conductive member 130 can be fixed to the surface of the battery cell 110 by adhesive and welding, thereby ensuring that the conductive member 130 is securely fixed to the battery cell 110. The adhesive and welding methods can provide sufficient tensile force between the conductive member 130 and the battery cell 110, ensuring connection reliability between the conductive member 130 and the battery cell 110, reducing costs, further reducing light shielding, and ensuring photoelectric conversion efficiency.

[0038] Furthermore, after the conductive member 130 is fixed to the battery cell 110 by welding, the area of ​​the conductive member 130 other than the area corresponding to the adhesive portion 120 can be electrically connected to the battery cell 110, thereby ensuring electrical contact performance between the conductive member 130 and the battery cell 110, and enabling the conductive member 130 to properly collect the current generated by the battery cell 110. In addition, the multiple fixing adhesive points 121 in the adhesive portion 120 are provided at intervals along the first direction, that is, a certain distance exists between two adjacent fixing adhesive points 121 along the first direction, so that the conductive member 130 is fixed to the surface of the battery cell 110 by adhesive.

[0039] The following describes the specific structure of the conductive member 130 in one embodiment.

[0040] Referring to Figures 2 to 4, in one embodiment, the conductive member 130 has a plurality of welding regions 131 and a plurality of adhesive regions 132 on its outer circumference, the plurality of welding regions 131 and the plurality of adhesive regions 132 are arranged alternately along a first direction, and the conductive member 130 has a further plurality of soldering portions 135 on its outer circumference, each of the plurality of soldering portions 135 corresponding to the plurality of welding regions 131, and each soldering portion 135 covers the conductive member 130 in the circumferential direction of the conductive member 130 in the welding region 131 with at least a portion thereof.

[0041] After the soldering portion 135 is provided in the welding area 131 of the conductive member 130, the soldering portion 135 facilitates the welding connection between the conductive member 130 and the battery cell 110, and further improves the robustness of the welding connection between the conductive member 130 and the battery cell 110. Here, the soldering portion 135 is a flux layer covering the conductive member 130.

[0042] The adhesive region 132 is provided corresponding to the fixed adhesive point 121, and the soldering portion 135 is provided in the welding region 131 of the conductive member 130, with no soldering portion 135 in the adhesive region 132 of the conductive member 130. In this way, multiple soldering portions 135 are provided on the conductive member 130 at intervals along the first direction, and a certain distance exists between two adjacent soldering portions 135, which is the adhesive region 132.

[0043] In other words, the outer wall of the conductive member 130 is provided with alternating flux layers and fluxless layers. The adhesive region 132 of the fluxless layer corresponds to the fixed bonding point 121, and the welded region 131 with the flux layer corresponds to the area of ​​the battery cell 110 other than the fixed bonding point 121 via the soldering portion 135.

[0044] When the conductive member 130 and the adhesive portion 120 are connected to the battery cell 110, the welding region 131 of the conductive member 130 can be welded to the battery cell 110 via the soldering portion 135, and the adhesive region 132 of the conductive member 130 is adhesively connected to the fixed adhesive point 121. The soldering portion 135 facilitates the welding connection between the conductive member 130 and the battery cell 110 in the welding region 131 and ensures the reliability of the welding connection between the conductive member 130 and the battery cell 110, while the fixed adhesive point 121 realizes the adhesive connection between the conductive member 130 and the battery cell 110.

[0045] Furthermore, since there is no soldering portion 135 in the bonding region 132, the acidic component in the soldering portion 135 does not suppress the activity of the catalyst component at the fixed bonding point 121, and the soldering portion 135 also prevents the formation of an alloy coating on the corresponding conductive member 130 in the bonding region 132. In this way, the fixed bonding point 121 secures the adhesive strength to bond the conductive member 130 and the battery cell 110, ensures the robustness of the non-alloy connection between the conductive member 130 and the battery cell 110, ensures the reliability of the connection between the conductive member 130 and the battery cell 110, avoids the problem of dummy welding defects occurring between the conductive member 130 and the battery cell 110, and ensures the output power of the solar power generation module.

[0046] In the above embodiment, a plurality of welding regions 131 and a plurality of adhesive regions 132 are provided on the outer circumference of the conductive member 130, and the plurality of welding regions 131 and a plurality of adhesive regions 132 are arranged alternately, and the conductive member 130 has soldering portions 135 in the welding regions 131 and does not have soldering portions 135 in the adhesive regions 132. After the conductive member 130 is fixed to the battery cell 110, the soldering portions 135 help to weld and fix the conductive member 130 to the battery cell 110 in the welding regions 131, increasing the robustness of the connection between the conductive member 130 and the battery cell 110. Furthermore, by ensuring that the soldered portion 135 of the conductive member 130 does not come into contact with the fixed bonding point 121, the adhesive force between the conductive member 130 and the fixed bonding point 121 is increased, ensuring the reliability of the adhesive connection between the conductive member 130 and the battery cell 110. Additionally, sufficient tensile force is ensured between the conductive member 130 and the battery cell 110, ensuring the reliability of the connection between the conductive member 130 and the battery cell 110, avoiding the problem of defective dummy welding between the conductive member 130 and the battery cell 110, and ensuring the operational performance of the solar power generation module.

[0047] Referring to Figures 3 and 4, in one embodiment, the soldering portion 135 completely covers the circumferential side of the conductive member 130 in the welding region 131. That is, the soldering portion 135 completely covers the conductive member 130 along its circumferential side in the welding region 131, and the outer wall of the conductive member 130 in the welding region 131 is covered by the soldering portion 135. In this way, when the conductive member 130 is welded to the battery cell 110 in the welding region 131, the soldering portion 135 can improve the reliability of the welded connection between the conductive member 130 and the battery cell 110.

[0048] Naturally, in other embodiments of this application, the soldering portion 135 may cover the surface of the conductive member 130 facing the battery cell 110 in the welding region 131. That is, if the soldering portion 135 is provided on the bottom surface of the welding region 131 of the conductive member 130 and the conductive member 130 is welded to the battery cell 110, the soldering portion 135 can ensure connection reliability between the conductive member 130 and the battery cell 110.

[0049] Referring to Figures 1 to 4, in one embodiment of this application, the battery cell 110 is a busbarless battery cell, and the conductive member 130 is fixed to the surface of the battery cell 110 via a plurality of fixed adhesive points 121 along a first direction. In this case, welding areas 131 and adhesive areas 132 are arranged alternately on the conductive member 130, and soldering portions 135 are provided in the welding areas 131, thereby realizing welded and adhesive connections between the conductive member 130 and the battery cell 110, while avoiding contact between the soldering portions 135 and the fixed adhesive points 121.

[0050] Referring to Figures 5 and 6, in another embodiment of the present application, the battery cell 110 is a busbarless battery cell, and the conductive member 130 is fixed to the surface of the battery cell 110 via a plurality of fixing adhesive points 121 and a welding pad 113 along a first direction, and the conductive member 130 is welded and bonded to the welding pad 113, the plurality of fixing adhesive points 121 and the battery cell 110. Figure 5 is a schematic diagram of a solar cell string 100 in another embodiment of the present application, and Figure 6 is a partial enlarged view of location B of the solar cell string 100 shown in Figure 5.

[0051] Multiple fixed bonding points 121 are provided along a first direction, and welding pads 113 are provided at both ends of the multiple fixed bonding points 121, that is, the ends are welding pads 113 and the middle part is the multiple fixed bonding points 121, forming a structural configuration, and the soldering portion 135 is provided in the welding region 131. In this way, the conductive member 130 is welded to the welding pads 113 and the areas of the battery cell 110 other than the fixed bonding points 121, and is bonded to the fixed bonding points 121 in the bonding region 132, thus avoiding contact between the soldering portion 135 and the fixed bonding points 121.

[0052] Naturally, in other embodiments of this application, busbar wires may be provided on the battery cell 110.

[0053] Referring to Figures 3 and 4, in one embodiment, each soldering portion 135 is provided in a liquid state. That is, the soldering portion 135 is a flux layer in a liquid state. Naturally, in other embodiments of this application, each soldering portion 135 is provided in a solid state. That is, the soldering portion 135 is a flux layer in a solid state.

[0054] The soldered portion 135 is formed mainly by covering the welding area 131 of the flux conductive member 130. The flux can reduce the surface tension of the solder and improve welding performance, thereby improving the reliability of the welded connection between the conductive member 130 and the battery cell 110. The specific material of the flux is from prior art and will not be repeated here.

[0055] Furthermore, the conductive member 130 obtains the soldered portion 135 by immersing the entire conductive member 130. Specifically, there is flux in the flux bath, and before welding the conductive member 130 to the battery cell 110, the conductive member 130 is passed through the flux bath, and the entire conductive member 130 is immersed in the flux in the flux bath, forming a flux layer on the surface of the conductive member 130. After the conductive member 130 is withdrawn from the flux bath, the flux layer in the bonding region 132 of the conductive member 130 is evaporated using a heating method or other method, that is, the flux layer in the bonding region 132 is removed, and in this way the conductive member 130 has a flux layer in the welding region 131 to form the soldered portion 135, and no flux layer in the bonding region 132.

[0056] Subsequently, the conductive member 130 is moved upward onto the battery cell 110, and the conductive member 130 is welded to the surface of the battery cell 110 using flux in the welding area 131, and bonded to the fixed bonding point 121 in the bonding area 132. This achieves both welded and bonded connections between the conductive member 130 and the battery cell 110, ensuring a reliable connection between the conductive member 130 and the battery cell 110, and improving the adhesive strength between the conductive member 130 and the battery cell 110.

[0057] Referring to Figures 1 to 4, in one embodiment, the surface of the battery cell 110 has conductive regions 111, and a plurality of conductive regions 111 are provided on the surface of the battery cell 110 at intervals along a first direction, and the conductive regions 111 extend along a second direction perpendicular to the first direction. The conductive regions 111 correspond to welding regions 131, and the soldering portion 135 welds the conductive member 130 to the conductive regions 111 of the battery cell 110 in the welding region 131. A fixed bonding point 121 is provided between two adjacent conductive regions 111.

[0058] The battery cell 110 has a busbarless structure, and multiple conductive regions 111 are provided on the surface of the battery cell 110, and the current of the battery cell 110 is collected by the conductive regions 111. The conductive regions 111 extend along a second direction, and the multiple conductive regions 111 are spaced apart along a first direction, establishing an intersecting relationship between the conductive member 130 and the conductive regions 111. Furthermore, the conductive member 130 is provided perpendicular to the conductive regions 111, and the conductive member 130 collects and transmits the current of the battery cell 110 in the conductive regions 111.

[0059] Fixed bonding points 121 are provided between adjacent conductive regions 111, thereby bonding and fixing the conductive member 130 to the battery cell 110 via the fixed bonding points 121. That is, the conductive regions 111 and fixed bonding points 121 are arranged alternately along the first direction, and furthermore, the welding regions 131 and bonding regions 132 in the conductive member 130 are arranged alternately along the first direction, and when the conductive member 130 corresponds to the battery cell 110, the welding regions 131 and the soldered portions 135 therein correspond to the conductive regions 111 of the battery cell 110, and the bonding regions 132 correspond to the fixed bonding points 121 in the battery cell 110, as shown in Figure 3.

[0060] In this manner, when the conductive member 130 is connected to the battery cell 110, the conductive member 130 is welded to the conductive region 111 of the battery cell 110 via the soldering portion 135 in the welding region 131, thereby fixing the conductive member 130 to the battery cell 110 and realizing an electrical connection between the conductive member 130 and the conductive region 111. At the same time, the fixing adhesive point 121 is adhesively connected to the adhesive region 132. In this way, the soldering portion 135 of the welding region 131 does not affect the activity of the catalyst component at the fixing adhesive point 121, improving the adhesive strength between the adhesive region 132 of the conductive member 130 and the fixing adhesive point 121, and further securely fixing the conductive member 130 to the battery cell 110.

[0061] Referring to Figures 1 to 3, in one embodiment, the battery cell 110 has a plurality of conductive layers 112, with at least one conductive layer 112 provided in each conductive region 111, the conductive layers 112 extending along a second direction, and if at least two conductive layers 112 are provided in the conductive region 111, at least two first conductive layers 112 are provided along the first direction. In other words, each conductive region 111 may have at least one conductive layer 112 extending along a second direction, the conductive layers 112 are made of a conductive material, and the current of the battery cell 110 is collected by the conductive layers 112.

[0062] The conductive member 130 is welded to the conductive layer 112 via a soldering portion 135 in the welding region 131, and the current collected by the conductive layer 112 is collected and transmitted by the conductive member 130. Furthermore, if each conductive region 111 has at least two conductive layers 112, the at least two conductive layers 112 are arranged with a gap along a first direction, and there is a gap along the first direction between two adjacent conductive layers 112, and the conductive member 130 can simultaneously weld to multiple conductive layers 112 of the conductive region 111 via a soldering portion 135 in the welding region 131.

[0063] As an option, the conductive layer 112 may be a finger, a metal wire, or another component capable of concentrating current. As an option, the number of conductive layers 112 in each conductive region 111 may be the same or different. As shown in Figure 3, in this embodiment, four conductive layers 112 are provided in each conductive region 111. Naturally, in other embodiments of this application, even more conductive layers 112 may be provided in each conductive region 111.

[0064] Referring to Figures 4 and 7, in one embodiment, along the first direction, the welding area 131 is located at the end of the conductive member 130, and thus the soldered portion 135 is located at the end of the conductive member 130. Figure 7 is a schematic cross-sectional view along the first direction of one embodiment of the conductive member 130 shown in Figure 4.

[0065] In Figures 4 and 7, the welding region 131 is located at the left end of the conductive member 130, and the welding region 131 and the bonding region 132 are arranged on the outer wall of the conductive member 130 in the order of welding region 131-bonding region 132-welding region 131-bonding region 132-.... Correspondingly, in the battery cell 110, the conductive region 111 is also located at the left end of the edge of the battery cell 110, and the conductive region 111 and the fixed bonding point 121 are arranged on the battery cell 110 in the order of conductive region 111-fixed bonding point 121-conductive region 111-fixed bonding point 121-....

[0066] In this way, the welding region 131 of the conductive member 130 and the soldered portion 135 therein can correspond one-to-one with the conductive region 111 of the battery cell 110, and the adhesive region 132 can correspond one-to-one with the fixed adhesive point 121 provided on the battery cell 110. When the conductive member 130 is connected to the battery cell 110, the conductive member 130 is welded to the welding region 131 of the battery cell 110 via the soldered portion 135 in the welding region 131, and the conductive member 130 is adhesively connected to the fixed adhesive point 121 via the adhesive region 132. This improves the adhesive strength at the fixed adhesive point 121 that connects the conductive member 130 and the battery cell 110, thereby improving the reliability of the connection between the conductive member 130 and the battery cell 110.

[0067] Referring to Figures 3 and 8, in another embodiment, along the first direction, the adhesive region 132 is located at the end of the conductive member 130, thereby creating a predetermined gap between the soldered portion 135 in the welded region 131 and the end of the conductive member 130. Figure 8 is a schematic diagram of another embodiment of the conductive member 130 shown in Figure 4.

[0068] In Figures 3 and 8, the adhesive region 132 is located at the left end of the conductive member 130, and the welding region 131 and adhesive region 132 are arranged outside the conductive member 130 in the order of adhesive region 132 - welding region 131 - adhesive region 132 - welding region 131 - ... Correspondingly, in the battery cell 110, the fixed adhesive point 121 is also located at the left end of the edge of the battery cell 110, and the conductive region 111 and fixed adhesive point 121 are arranged in the order of fixed adhesive point 121 - conductive region 111 - fixed adhesive point 121 - conductive region 111 - ...

[0069] In this way, the welding region 131 of the conductive member 130 and the soldered portion 135 therein can correspond one-to-one with the conductive region 111 of the battery cell 110, and the adhesive region 132 can correspond one-to-one with the fixed adhesive point 121 provided on the battery cell 110. When the conductive member 130 is connected to the battery cell 110, the conductive member 130 is welded to the welding region 131 of the battery cell 110 via the soldered portion 135 in the welding region 131, and the conductive member 130 is adhesively connected to the fixed adhesive point 121 via the adhesive region 132. This improves the adhesive strength at the fixed adhesive point 121 that connects the conductive member 130 and the battery cell 110, thereby improving the reliability of the connection between the conductive member 130 and the battery cell 110.

[0070] Naturally, in this embodiment, if the adhesive region 132 is located at the left end of the conductive member 130, a predetermined gap exists between the welding region 131 and the soldered portion 135 therein and the left end of the conductive member 130. In this case, a fixed adhesive point 121 does not need to be provided at the leftmost end of the battery cell 110, and the leftmost adhesive region 132 does not need to correspond to the fixed adhesive point 121.

[0071] In principle, there is no limit to the number of welding areas 131 and adhesive areas 132 in the conductive member 130. The number of welding areas 131 and adhesive areas 132 is determined based on the length of the conductive member 130 along the first direction, and the length of the conductive member 130 along the first direction is related to the length of the battery cell 110 along the first direction. In this application, it is sufficient to ensure that the welding areas 131 and adhesive areas 132 are arranged alternately along the first direction of the conductive member 130, that welds are provided in the welding areas 131, and that no welding areas 131 are provided in the adhesive areas 132.

[0072] In one embodiment, the length of the welding region 131 along the first direction is the same as and / or different from the length of the adhesive region 132 along the first direction. In principle, the lengths of the welding region 131 and the adhesive region 132 along the first direction are not limited, as long as the welding region 131 and the adhesive region 132 are arranged alternately along the first direction in the conductive member 130, and it is sufficient to ensure that the soldered portion 135 is provided in the welding region 131 but not in the adhesive region 132.

[0073] As an option, the length of the welding region 131 along the first direction is the same as the length of the adhesive region 132 along the first direction. That is, the welding region 131 is provided with the same length as the adhesive region 132 and is arranged alternately along the first direction in the conductive member 130. Referring to Figures 3, 4, 6, and 7, as an option, the length of the welding region 131 along the first direction is not equal to the length of the adhesive region 132 along the first direction. That is, the welding region 131 is provided with a different length from the adhesive region 132 and is arranged alternately along the first direction in the conductive member 130.

[0074] Naturally, in other embodiments of this application, the length of some welding regions 131 along the first direction is the same as the length of adhesive regions 132 along the first direction, and the length of some welding regions 131 along the first direction is not equal to the length of adhesive regions 132 along the first direction, as long as it is ensured that the welding regions 131 and adhesive regions 132 are arranged alternately along the first direction in the conductive member 130.

[0075] Referring to Figures 3, 4, 6, and 7, in one embodiment, the lengths of each welding region 131 along the first direction are the same and / or different. The length of the welding region 131 along the first direction is not limited in principle, as long as a soldering portion 135 is provided in the welding region 131 and the conductive member 130 is welded to the conductive region 111 of the battery cell 110 via the soldering portion 135 in the welding region 131, thereby ensuring that an electrical connection is made between the conductive member 130 and the battery cell 110.

[0076] In this embodiment, referring to Figures 3, 4, 6, and 7, the length of each welding region 131 along the first direction is the same. That is, each welding region 131 is distributed with the same length along the first direction, and as a result, each bonding region 132 is distributed at equal intervals in the conductive member 130. Naturally, in other embodiments of this application, the lengths of each welding region 131 along the first direction are different, or the lengths of some welding regions 131 along the first direction are the same, and the lengths of some welding regions 131 along the first direction are different.

[0077] Referring to Figures 3, 4, 6, and 7, in one embodiment, the lengths of each adhesive region 132 along the first direction are the same and / or different. The length of the adhesive region 132 along the first direction is not limited in principle, as long as no soldering portion 135 is provided in the adhesive region 132. In this way, the conductive member 130 is bonded to the fixed adhesive point 121 in the adhesive region 132, thereby preventing the acidic component in the soldering portion 135 from suppressing the activity of the catalytic component at the fixed adhesive point 121, and ensuring the adhesive strength at the fixed adhesive point 121 that connects the conductive member 130 and the battery cell 110.

[0078] In this embodiment, referring to Figures 3, 4, 6, and 7, the length of each adhesive region 132 along the first direction is the same. That is, each adhesive region 132 is distributed with the same length along the first direction, and as a result, each welded region 131 is distributed at equal intervals in the conductive member 130. Naturally, in other embodiments of this application, the lengths of each adhesive region 132 along the first direction are different, or some adhesive regions 132 have the same length along the first direction, and some adhesive regions 132 have different lengths along the first direction.

[0079] In this embodiment, the length of the welding region 131 along the first direction is greater than the length of the bonding region 132 along the first direction. That is, the length of each welding region 131 along the first direction is the same, the length of each bonding region 132 along the first direction is the same, and the length of the welding region 131 is greater than the length of the bonding region 132.

[0080] Thus, the length of the welded connection between the conductive member 130 and the battery cell 110 is greater than the length of the adhesive connection. This ensures a reliable connection between the conductive member 130 and the battery cell 110 through both adhesive and welded connections, while also ensuring sufficient length for the electrical connection between the conductive member 130 and the battery cell 110. This ensures electrical contact performance between the conductive member 130 and the battery cell 110, allowing the conductive member 130 to properly collect the current generated by the battery cell 110.

[0081] In one embodiment, the length of the adhesive region 132 along the first direction is 1 / 5 to 1 / 2 of the length of the welding region 131 along the first direction. In this way, a reliable connection between the conductive member 130 and the battery cell 110 can be ensured, as well as the length of the electrical connection between the conductive member 130 and the battery cell 110.

[0082] Referring to Figures 3, 4, 6, and 7, in one embodiment, the length of the soldering portion 135 along the first direction is less than or equal to the length of the welding region 131 along the first direction. In other words, at least a portion of the soldering portion 135 covers the welding region 131 along the first direction, thereby ensuring the length of the electrical connection between the conductive member 130 and the conductive region 111.

[0083] Illustratively, referring to Figures 3, 4, 6, and 7, the length of the soldering portion 135 along the first direction is equal to the length of the welding area 131 along the first direction. Of course, in other embodiments of this application, the length of the soldering portion 135 along the first direction may be less than the length of the welding area 131 along the first direction.

[0084] Referring to Figures 3, 4, 6, and 7, in one embodiment, the length of the fixing point 121 along the first direction is less than or equal to the length of the adhesive region 132 along the first direction. That is, at least a portion of the fixing point 121 covers the adhesive region 132 along the first direction, thereby the fixing point 121 effectively bonds the conductive member 130 and the battery cell 110.

[0085] In principle, the type of conductive member 130 is not limited; as long as the conductive member 130 is conductive, it is sufficient, and those skilled in the art can select it as needed, provided that it enables effective collection of current in the battery cell 110, reduces the shielding of the conductive member 130 from light rays, and improves the efficiency of the photovoltaic power generation module.

[0086] Referring to Figures 1, 2, 5, and 6, in this embodiment, the conductive member 130 is a conductive metal wire, which has a thin diameter and can collect current while reducing light shielding, thereby improving the efficiency of the photovoltaic module. Of course, in other embodiments of this application, the conductive member 130 may be a conductive metal strip or a conductive wire, etc.

[0087] Furthermore, the conductive member 130 of this application can be packaged into a solar cell module using a thinner packaging adhesive film after collecting current using a conductive metal wire and manufacturing a solar cell string 100, thereby reducing material costs and decreasing the amount of metal electrodes used, and lowering the manufacturing cost of the solar cell module. In this way, the solar cell string 100 can collect current using more and thinner conductive members 130, shortening the current transmission distance and being advantageous for improving power.

[0088] Referring to Figures 1, 2, 5, and 6, in one embodiment, the diameter of the conductive member 130 is 0.1 mm to 0.3 mm. That is, the longitudinal cross-sectional shape of the conductive member 130 is circular, and the conductive member 130 has a thin wire-like structure. In this application, since multiple conductive members 130 are provided, even if the diameter of the conductive member 130 is thin, it does not affect the collection of current from the solar cell string 100. At the same time, the thin diameter of the conductive member 130 reduces light shielding, improving the efficiency of the photovoltaic module, allowing for packaging using a thinner packaging adhesive film, reducing the amount of metal electrodes used, and lowering the manufacturing cost of the photovoltaic module.

[0089] Naturally, in other embodiments of this application, the longitudinal cross-sectional shape of the conductive member 130 is an equilateral triangle, and the side length of the longitudinal cross-section of the conductive member 130 is 0.1 mm to 0.3 mm. In this application, since multiple conductive members 130 are provided, even if the longitudinal cross-sectional dimensions of the conductive member 130 are thin, it does not affect the collection of current from the solar cell string 100. At the same time, the thin longitudinal cross-sectional dimensions of the conductive member 130 reduce shielding from light, improve the efficiency of the photovoltaic module, enable packaging using a thinner packaging adhesive film, reduce the amount of metal electrodes used, and lower the manufacturing cost of the photovoltaic module.

[0090] Referring to Figures 1 to 3, 5 and 6, in one embodiment, there are multiple adhesive portions 120, and these multiple adhesive portions 120 are provided on the surface of the battery cell 110 at intervals along a second direction perpendicular to the first direction. There are multiple conductive members 130, and each adhesive portion 120 is connected to one conductive member 130, and each conductive member 130 is provided with multiple soldering portions 135 at intervals.

[0091] In other words, the surface of the battery cell 110 is provided with a plurality of adhesive portions 120 arranged at intervals along a second direction, and each adhesive portion 120 fixes one conductive member 130. The plurality of conductive members 130 are each fixed to the surface of the battery cell 110 by welding and adhesive connections. In this way, the battery cell 110 is connected to adjacent battery cells 110 via the plurality of conductive members 130, thereby enabling the collection of current generated by two adjacent battery cells 110 and the manufacture of a battery string. As an option, the layout of the fixing adhesive points 121 in each adhesive portion 120 may be the same and / or different.

[0092] Referring to Figures 1, 2, 5, and 6, in one embodiment, the conductive member 130 is a conductive metal wire, and a plurality of conductive members 130 are fixed to the surface of the battery cell 110 by welding and adhesive connections. In this embodiment, there are 24 conductive members 130. The current of the battery cell 110 is collected by the conductive members 130, which are 24 conductive metal wires. Of course, in other embodiments of this application, the battery cell 110 can also collect current using a different number of conductive members 130, which are conductive metal wires.

[0093] Referring to Figures 4, 7, and 8, in one embodiment, the conductive member 130 includes a conductive substrate 133 and a metal coating layer 134, the metal coating layer 134 covering the outside of the conductive substrate 133. The soldering portion 135 covers the metal coating layer 134 along the circumferential direction. In the welding region 131, the soldering portion 135 covers the outside of the metal coating layer 134, and in the welding region 131, the metal coating layer 134 of the conductive member 130 is welded to the conductive region 111 by the soldering portion 135, and the conductive member 130 contacts the fixed bonding point 121 by the metal coating layer 134 in the bonding region 132.

[0094] After the conductive member 130 has a metal coating layer 134 welded to the conductive region 111 of the battery cell 110 via a solder joint 135 in the welding region 131, the metal coating layer 134 enables an electrical connection between the conductive substrate 133 and the conductive region 111 of the battery cell 110, thereby allowing the conductive substrate 133 to collect the current generated by the battery cell 110.

[0095] As an option, the conductive substrate 133 is generally a copper strip. Naturally, in other embodiments of this application, the conductive substrate 133 may be other conductive materials with excellent conductivity. As an option, the metal coating layer 134 may include, but is not limited to, a multi-element solder consisting of tin, lead, bismuth, silver, etc., and the melting point of the metal coating layer 134 may be 140°C to 250°C.

[0096] In one embodiment, the fixed bonding point 121 is formed from an adhesive that can be catalytically cured depending on the curing conditions. In order to avoid the acidic component in the soldering portion 135 suppressing the activity of the catalytic component in the fixed bonding point 121, the soldering portion 135 is not provided in the bonding region 132 in this application.

[0097] In one embodiment, the curing conditions for the fixed bonding point 121 may be light, heat, or other types of catalytic conditions. That is, the fixed bonding point 121 may be cured by a light curing method, a heat curing method, or another curing method.

[0098] The shape of the fixed bonding point 121 is not restricted in principle; it is sufficient that the fixed bonding point 121 can bond the bonding area 132 of the conductive member 130 to the battery cell 110. Options for the shape of the fixed bonding point 121 include hemispherical, rectangular, linear joint type, curved joint type, linear and curved joint type, or other shapes.

[0099] Exemplary, as shown in Figure 3, the shape of the fixing point 121 is hemispherical, that is, the outer contour of the fixing point 121 is semicircular. Of course, in other embodiments of this application, the fixing point 121 may be rectangular or have other regular or irregular shapes.

[0100] In one embodiment, the shapes of each fixing point 121 are the same and / or different. Alternatively, the shapes of each fixing point 121 are the same. Alternatively, the shapes of each fixing point 121 are different. Alternatively, some fixing points 121 are the same and some are different. In principle, the shape of the fixing points 121 is not limited; they only need to be able to bond the conductive member 130 and the battery cell 110 together.

[0101] The solar cell string 100 of this application has a plurality of welding regions 131 and a plurality of adhesive regions 132 provided on the outer circumference of a conductive member 130, the plurality of welding regions 131 and the plurality of adhesive regions 132 are arranged alternately along a first direction, the conductive member 130 has soldered portions 135 in the welding regions 131 and does not have soldered portions 135 in the adhesive regions 132, and in this way the welding regions 131 and the soldered portions 135 therein of the conductive member 130 can correspond to the conductive regions 111 of the battery cell 110, and the adhesive regions 132 of the conductive member 130 can correspond to the fixed adhesive points 121.

[0102] After the conductive member 130 is fixed to the battery cell 110, the soldering portion 135 helps to weld the conductive member 130 to the battery cell 110 in the welding area 131, increasing the robustness of the connection between the conductive member 130 and the battery cell 110. At the same time, the soldering portion 135 of the conductive member 130 does not come into contact with the fixing adhesive point 121, thereby increasing the adhesive force between the conductive member 130 and the fixing adhesive point 121, ensuring the reliability of the adhesive connection between the conductive member 130 and the battery cell 110. Furthermore, it ensures that sufficient tensile force exists between the conductive member 130 and the battery cell 110, ensuring the reliability of the connection between the conductive member 130 and the battery cell 110, avoiding the problem of dummy welding defects between the conductive member 130 and the battery cell 110, and ensuring the operational performance of the solar power generation module.

[0103] Referring to Figures 1, 2, 5, and 6, the present application further provides a photovoltaic module comprising a plurality of solar cell strings 100, a cover plate and a back plate, wherein the plurality of solar cell strings 100 are connected in series along a first direction, the cover plate and back plate are provided on both sides of the solar cell strings 100, and the cover plate, back plate and solar cell strings 100 are packaged using a packaging process.

[0104] When manufacturing a photovoltaic power generation module using the solar cell string 100 according to the above embodiment, the reliability of the connection between the conductive member 130 and the battery cell 110 is ensured, the problem of dummy welding defects occurring between the conductive member 130 and the battery cell 110 is avoided, and the performance of the photovoltaic power generation module is ensured. Furthermore, the shielding of the conductive member 130 from light is reduced, improving the efficiency of the photovoltaic power generation module, and the solar cell string 100 can be packaged using a thinner packaging adhesive film, thereby reducing manufacturing costs.

[0105] Each of the technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of each of the technical features in the above embodiments are described. However, as long as these combinations of technical features are inconsistent, they should be considered to fall within the scope described herein.

[0106] The above embodiments are merely examples of some embodiments of this application, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the patent application. Furthermore, those skilled in the art can make several further modifications and improvements without departing from the concept of this application, and all of these fall within the scope of protection of this application. Therefore, the scope of protection of the patent application should be based on the attached claims. [Explanation of Symbols]

[0107] 100 solar cell strings 110 battery cells 111 Conductive area 112 Conductive layer 113 Welding Pad 120 Adhesive part 121 Fixed adhesive point 130 Conductive material 131 Welding Area 132 Adhesion area 133 Conductive substrate 134 Metal coating layer 135 Soldering section

Claims

1. A conductive member, The conductive member (130) has a plurality of welding regions (131) and a plurality of adhesive regions (132) on its outer circumference, and the plurality of welding regions (131) and the plurality of adhesive regions (132) are arranged alternately along a first direction. A conductive member characterized in that it has a plurality of soldering portions (135) on the outer circumference of the conductive member (130), the plurality of soldering portions (135) each correspond to a plurality of welding regions (131), and at least a portion of each soldering portion (135) covers the conductive member (130) along the circumferential direction of the conductive member (130) in the welding region (131).

2. The conductive member according to claim 1, characterized in that the soldering portion (135) is located at the end of the conductive member (130), the welding region (131) is located at the end of the conductive member (130) along the first direction, or the bonding region (132) is located at the end of the conductive member (130) along the first direction.

3. The length of the welding region (131) along the first direction is the same as and / or different from the length of the bonding region (132) along the first direction, and / or The lengths of each welding region (131) along the first direction are the same and / or different and / or The conductive member according to claim 1, characterized in that the lengths of each of the adhesive regions (132) along the first direction are the same and / or different.

4. The conductive member according to claim 1, characterized in that the length of the welding region (131) along the first direction is greater than the length of the bonding region (132) along the first direction.

5. The conductive member (130) is a conductive metal wire or a conductive metal strip. The conductive member according to claim 1, characterized in that the diameter of the conductive member (130) is 0.1 mm to 0.3 mm, or the longitudinal cross-sectional shape of the conductive member (130) is an equilateral triangle and the side length of the longitudinal cross-section of the conductive member (130) is 0.1 mm to 0.3 mm.

6. The conductive member (130) includes a conductive substrate (133) and a metal coating layer (134), the metal coating layer (134) covers the outside of the conductive substrate (133), The aforementioned soldered portion (135) is covered with the metal coating layer (134) along the circumferential direction. The conductive member according to any one of claims 1 to 5, characterized in that each of the aforementioned soldering portions (135) is provided in a liquid state, or each of the aforementioned soldering portions (135) is provided in a solid state.

7. A solar cell string, The device comprises a battery cell (110), an adhesive portion (120), and a conductive member (130) according to any one of claims 1 to 5. The adhesive portion (120) includes a plurality of fixed adhesive points (121), the plurality of fixed adhesive points (121) are provided on the surface of the battery cell (110) at intervals along a first direction, and the fixed adhesive points (121) are provided corresponding to the adhesive area (132) of the conductive member (130). A solar cell string characterized in that the conductive member (130) is welded and fixed to the surface of the battery cell (110) via a soldering portion (135) in a welding region (131), and the conductive member (130) is adhesively connected to the fixing adhesive point (121) in an adhesive region (132).

8. The length of the soldered portion (135) along the first direction is less than or equal to the length of the welding region (131) along the first direction, and / or The solar cell string according to claim 7, characterized in that the length of the fixed bonding point (121) along the first direction is less than or equal to the length of the bonding region (132) along the first direction.

9. The number of adhesive portions (120) is multiple, and the multiple adhesive portions (120) are provided on the surface of the battery cell (110) at intervals along a second direction perpendicular to the first direction. The solar cell string according to claim 8, characterized in that there are multiple conductive members (130), each adhesive portion (120) is connected to one conductive member (130), and each conductive member (130) is provided with multiple soldering portions (135) spaced apart.

10. The battery cell (110) has conductive regions (111) on its surface, and a plurality of the conductive regions (111) are provided on the surface of the battery cell (110) at intervals along the first direction, and the conductive regions (111) extend along a second direction perpendicular to the first direction. The conductive region (111) corresponds to the welding region (131), and the soldering portion (135) welds the conductive member (130) to the conductive region (111) of the battery cell (110) in the welding region (131). The solar cell string according to any one of claims 7 to 9, characterized in that the fixed adhesive point (121) is provided between two adjacent conductive regions (111).

11. The battery cell (110) has a plurality of conductive layers (112), with at least one conductive layer (112) provided in each conductive region (111), and the conductive layers (112) extend along the second direction. The solar cell string according to claim 10, characterized in that, if at least two conductive layers (112) are provided in the conductive region (111), at least two of the conductive layers (112) are provided spaced apart along the first direction.

12. It is a solar power generation module, It includes a cover plate, a back plate, and a solar cell string (100) according to any one of the multiple claims 7 to 9, Multiple solar cell strings (100) are connected in series along a first direction. The photovoltaic module is characterized in that the cover plate and the back plate are provided on both sides of the solar cell string (100), and the cover plate, the back plate and the solar cell string (100) are packaged using a packaging process.

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