Connecting structure, battery assembly and photovoltaic system

Abstract

The invention provides a connection structure, a battery assembly and a photovoltaic system. The connecting structure is used for the battery assembly, the battery assembly comprises a battery piece, a first welding strip and a second welding strip, the connecting structure is conductively connected with the first welding strip, and the connecting structure is insulated from the second welding strip; wherein the connecting structure comprises a confluence module and a connecting module, the connecting module comprises a plurality of conductive parts and a plurality of insulating parts, the conductive parts are used for conductively connecting the confluence module and the first welding strip, and the insulating parts are used for insulating the confluence module and the second welding strip. According to the embodiment of the invention, the connecting structure comprising the confluence module and the connecting module is arranged, the confluence module and the first welding strip are conductively connected through the conductive part of the connecting module, and the confluence module and the second welding strip are insulated through the insulating part of the connecting module, so that the arrangement of a bus bar and an insulating part can be avoided; therefore, the number of connecting elements in the battery assembly can be reduced, the manufacturing process of the battery assembly is simplified, and the manufacturing efficiency of the battery assembly is improved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a connection structure, a battery assembly and a photovoltaic system. Background Art

[0002] In the existing back-contact battery assembly manufacturing process, when setting the bus bar, it is necessary to lay insulating parts, and to open spaced avoidance holes at corresponding positions of the insulating parts, and the laid insulating parts and bus bars need to be pre-fixed. Therefore, the battery assembly manufacturing process in the related technology is relatively cumbersome and the battery assembly manufacturing efficiency is low.

[0003] Based on this, how to simplify the production process of related battery components has become an urgent problem to be solved. Summary of the invention

[0004] The present invention provides a connection structure, a battery assembly and a photovoltaic system to solve the technical problem of how to simplify the manufacturing process of the battery assembly.

[0005] The embodiment of the present invention is implemented as follows: the present invention provides a connection structure, a battery assembly and a photovoltaic system. A connection structure is used for a battery assembly, the battery assembly includes a plurality of battery cells, a plurality of first welding strips and a plurality of second welding strips, the first welding strips and the second welding strips are arranged on the backlight surface of the battery cell, the connection structure is arranged on the side of the first welding strip and the second welding strip away from the battery cell, the connection structure is conductively connected to the first welding strip, and the connection structure is insulated from the second welding strip; wherein the connection structure includes a bus module and a connection module, the connection module is used to be arranged on the side of the first welding strip and the second welding strip away from the battery cell, and the bus module is used to be arranged on the side of the connection module away from the first welding strip and the second welding strip; the connection module includes a plurality of conductive parts and a plurality of insulating parts, the conductive parts and the insulating parts are alternately arranged, the conductive parts are used to conductively connect the bus module and the first welding strip, and the insulating parts are used to insulate the bus module and the second welding strip.

[0006] Furthermore, the multiple insulating parts include a first insulating part; the first insulating part includes a first insulating layer and a second insulating layer, the first insulating layer is arranged on the side of the second welding strip away from the battery cell, and the second insulating layer is arranged on the side of the first insulating layer away from the second welding strip; the hardness of the second insulating layer is greater than the hardness of the first insulating layer.

[0007] Furthermore, the first insulating layer includes an EVA insulating layer, a TPE insulating layer, a TPU insulating layer or a rubber insulating layer.

[0008] Furthermore, the second insulating layer includes a PET insulating layer, a PEN insulating layer, a PBT insulating layer or a PTT insulating layer.

[0009] Furthermore, the plurality of insulating parts include a second insulating part, the second insulating part includes a pressure-sensitive adhesive layer and a third insulating layer, the pressure-sensitive adhesive layer is arranged on the side of the second welding strip away from the battery cell, and the third insulating layer is arranged on the side of the pressure-sensitive adhesive layer away from the second welding strip.

[0010] Further, the third insulating layer includes a PET insulating layer, a PEN insulating layer, a PBT insulating layer or a PTT insulating layer.

[0011] Furthermore, the number of the second insulating parts is at least two.

[0012] Further, the number of the second insulating parts is greater than the number of the first insulating parts.

[0013] Furthermore, the connection module includes protrusions provided at both ends of the connection module, and the protrusions abut against one end of the confluence module.

[0014] Furthermore, the conductive portion includes a conductive groove corresponding to the structure of the first welding strip.

[0015] Furthermore, the insulating portion includes an insulating groove corresponding to the structure of the second welding strip.

[0016] Furthermore, the busbar module includes a tin solder layer, a tin-bismuth alloy solder, a tin-lead alloy solder layer or a tin-bismuth-lead alloy solder layer.

[0017] Furthermore, the conductive part includes a copper conductive part, an aluminum conductive part or a copper-aluminum alloy conductive part.

[0018] An embodiment of the present invention further provides a battery assembly, which includes a battery cell, a plurality of first welding strips and a plurality of second welding strips, and the connection structure as described above.

[0019] Furthermore, the width of the conductive portion is greater than the width of the first welding strip.

[0020] Furthermore, the width of the insulating portion is greater than the width of the second welding strip.

[0021] Furthermore, there are a plurality of battery cells, and two adjacent battery cells partially overlap.

[0022] Furthermore, the connection structure is arranged on the backlight surface of the battery cell.

[0023] An embodiment of the present invention further provides a photovoltaic system, which includes the battery assembly as described above.

[0024] In the embodiment of the present invention, a connection structure including a bus module and a connecting module is provided. The bus module and the first welding strip are conductively connected by the conductive part of the connecting module, and the bus module and the second welding strip are insulated by the insulating part of the connecting module. This can avoid separately setting bus bars and insulating parts, and further reduce the number of connecting elements in the battery assembly, thereby simplifying the manufacturing process of the battery assembly and improving the manufacturing efficiency of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of a module of a photovoltaic system provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of a battery assembly provided by an embodiment of the present invention;

[0028] Figure 3 is a partial structural schematic diagram of a battery assembly provided by an embodiment of the present invention;

[0029] Figure 4 is a structural schematic diagram of a connection structure provided by another embodiment of the present invention;

[0030] Figure 5 is a cross-sectional schematic diagram of a partial structure of a battery assembly provided by another embodiment of the present invention;

[0031] Figure 6 is a cross-sectional schematic diagram of a partial structure of a battery assembly provided by another embodiment of the present invention;

[0032] Figure 7 is a cross-sectional schematic diagram of a partial structure of a battery assembly provided by another embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of the configuration structure of a conductive portion provided by an embodiment of the present invention;

[0034] Fig. 9 is a schematic diagram of the configuration structure of a first insulating portion provided by another embodiment of the present invention;

[0035] Fig.10 is a schematic diagram of the configuration structure of a second insulating portion provided by another embodiment of the present invention;

[0036] Fig.11 is a schematic diagram of the configuration structure of a conductive groove provided by an embodiment of the present invention;

[0037] Fig.12 is a schematic diagram of the configuration structure of the insulating groove provided by another embodiment of the present invention;

[0038] Fig.13 It is a schematic diagram of the configuration structure of the insulating groove provided in yet another embodiment of the present invention.

[0039] Explanation of main component symbols: 1000, photovoltaic system; 1001, battery assembly; 100, connection structure; 200, battery cell; 300, first welding ribbon; 400, second welding ribbon; 10, busbar module; 20, connection module; 21, conductive part; 22, insulating part; 23, protrusion; 221, first insulating part; 222, second insulating part; 2211, first insulating layer; 2212, second insulating layer; 2221, pressure-sensitive adhesive layer; 2222, third insulating layer; 2101, conductive groove; 2201, insulating groove. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "top", "bottom", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use scenarios of other materials.

[0045] See also Figure 1 The photovoltaic system 1000 in the embodiment of the present invention may include the battery assembly 1001 in the embodiment of the present invention. The battery assembly 1001 in the embodiment of the present invention may include a battery cell 200, a first welding ribbon 300, a second welding ribbon 400, and a connection structure 100 in the embodiment of the present invention. A plurality of battery cells 200 may be serially connected together through the welding ribbons to form the battery assembly 1001. The battery cells 200 in the battery assembly 1001 may be connected in series, in parallel, or in a combination of series and parallel to realize the current convergence output.

[0046] In this embodiment, the photovoltaic system 1000 can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system 1000 are not limited to this, that is, the photovoltaic system 1000 can be applied to all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a junction box and an inverter. The photovoltaic array may be an array combination of multiple battery assemblies 1001. For example, multiple battery assemblies 1001 may form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter to convert it into the alternating current required by the mains power grid and then connected to the mains network to realize solar power supply.

[0047] The accompanying drawings provided by the present invention are schematic diagrams, and some elements are not shown in the drawings. The purpose is to clearly describe the technical solution and highlight the key points of the invention. It is not intended to limit the technical solution to not include these unshown elements. In other words, the accompanying drawings are only examples and do not represent a limitation on the specific form of the back contact battery.

[0048] like Figures 2 to 13 As shown, the connection structure 100 in the embodiment of the present invention is used for a battery assembly 1001, and the battery assembly 1001 includes a plurality of battery cells 200, a plurality of first welding strips 300, and a plurality of second welding strips 400. The first welding strips 300 and the second welding strips 400 are arranged on the backlight surface of the battery cell 200, and the connection structure 100 is arranged on the side of the first welding strips 300 and the second welding strips 400 away from the battery cell 200. The connection structure 100 is conductively connected to the first welding strips 300, and the connection structure 100 is insulated from the second welding strips 400. Among them, the connection structure 100 includes a bus module 10 and a connection module 20, and the connection module 20 is used to be arranged on the side of the first welding strips 300 and the second welding strips 400 away from the battery cell 200, and the bus module 10 is used to be arranged on the side of the connection module 20 away from the first welding strips 300 and the second welding strips 400. The connection module 20 includes a plurality of conductive parts 21 and a plurality of insulating parts 22 , which are arranged alternately. The conductive parts 21 are used to conductively connect the bus module 10 and the first welding strip 300 , and the insulating parts 22 are used to insulate the bus module 10 and the second welding strip 400 .

[0049] Thus, in the embodiment of the present invention, a connection structure 100 including a bus module 10 and a connection module 20 is provided. The bus module 10 and the first welding strip 300 are conductively connected by the conductive part 21 of the connection module 20, and the bus module 10 and the second welding strip 400 are insulated by the insulating part 22 of the connection module 20. This can avoid separately setting bus bars and insulating parts, and further reduce the number of connecting elements in the battery assembly 1001, thereby simplifying the manufacturing process of the battery assembly 1001 and improving the manufacturing efficiency of the battery assembly 1001.

[0050] At the same time, in the embodiment of the present invention, the bus bar in the prior art can be replaced by the bus module 10 in the connection structure 100, and there is no need to add thicker insulating parts. When the battery assembly 1001 is manufactured, the thickness of the battery assembly 1001 can be reduced, thereby reducing the risk of hidden breakage and cracking of the battery cell 200 during the lamination process.

[0051] In addition, in the prior art, when setting the busbar, it is necessary to set an insulating member on the surface of the busbar, and to open spaced avoidance holes at the corresponding positions of the insulating member to achieve electrical connection between the busbar and the welding strip. However, the method of opening spaced avoidance holes at the corresponding positions of the insulating member in the prior art is prone to thermal stress concentration and the like, which can easily cause the battery cell 200 to warp, thereby increasing the risk of hidden cracks in the battery cell 200. In the embodiment of the present invention, the busbar in the prior art can be replaced by the busbar module 10 in the connection structure 100, and there is no need to add insulating members and punch holes in the insulating members, thereby indirectly alleviating the thermal stress concentration and the like during welding, and reducing the risk of hidden cracks in the battery cell 200.

[0052] Specifically, the cell 200 in the present invention may be a back-contact solar cell 200 .

[0053] Furthermore, the cell 200 includes a front side and a back side facing each other, the front side faces the sun, and the back side is the side where the cell 200 is provided with electrodes. The electrodes of the cell 200 may be main grids and / or fine grids. The first welding strip 300 and the second welding strip 400 are provided on the back side of the cell 200.

[0054] The battery cell 200 has two types of electrode polarities, namely, a first electrode and a second electrode. The first electrode and the second electrode have opposite polarities. Furthermore, one of the first electrode and the second electrode is a positive electrode, and the other of the first electrode and the second electrode is a negative electrode. For example, the first electrode is a positive electrode, and the second electrode is a negative electrode; or, the second electrode is a positive electrode, and the first electrode is a negative electrode.

[0055] Specifically, the connection structure 100 is disposed on a side of the first welding ribbon 300 and the second welding ribbon 400 that is away from the battery cell 200 in the battery string.

[0056] Specifically, the connection structure 100 includes a bus module 10 and a connection module 20. The bus module 10 can replace the bus bar in the prior art, and the current collected by each first welding ribbon 300 can be converged through the bus module 10. Moreover, the bus module 10 can also realize the connection of each battery string. Further, the connection module 20 is used to realize the connection or insulation between the first welding ribbon 300 and the second welding ribbon 400 and the bus module 10.

[0057] Further, the bus module 10 may specifically include a tin solder layer, a tin-bismuth alloy solder, a tin-lead alloy solder layer, or a tin-bismuth-lead alloy solder layer. The bus module 10 may specifically be made of one or more of tin solder, tin-bismuth alloy, tin-lead alloy, or tin-bismuth-lead alloy solder, which is not limited here.

[0058] Further, the connection structure 100 has a connection module 20 and a confluence module 10 disposed on the surface of the connection module 20. The connection module 20 includes a plurality of insulating portions 22 and a plurality of conductive portions 21, and the insulating portion 22 separates two adjacent conductive portions 21. The insulating portions 22 and the conductive portions 21 in the connection module 20 are staggered. In other words, one insulating portion 22 is formed between two adjacent conductive portions 21, and one conductive portion 21 is formed between two adjacent insulating portions 22. The conductive portion 21 is disposed correspondingly to the first welding strip 300, and the insulating portion 22 is disposed correspondingly to the second welding strip 400.

[0059] like Figure 2 and Figure 3 As shown, in the embodiment of the present invention, the connection structure 100 is specifically provided at the first battery cell 200 located along the arrangement direction of the battery cells 200. The first welding strip 300 is conductively connected to the first electrode of the first battery cell 200 along the arrangement direction of the battery cells 200, and the second welding strip 400 is conductively connected to the second electrode of the first battery cell 200 along the arrangement direction of the battery cells 200 and to the first electrode of the second battery cell 200 along the arrangement direction of the battery cells 200. In the battery assembly 1001, the bus module 10 in the connection structure 100 is conductively connected to the first welding strip 300 through the conductive portion 21, and the bus module 10 in the connection structure 100 is insulated from the second welding strip 400 through the insulating portion 22.

[0060] It can be understood that “the conductive portion 21 is disposed correspondingly to the first soldering strip 300” means that the positions of the conductive portion 21 and the first soldering strip 300 match in the length direction of the connection structure 100. “The insulating portion 22 is disposed correspondingly to the second soldering strip 400” means that the positions of the insulating portion 22 and the second soldering strip 400 match in the length direction of the connection structure 100.

[0061] Furthermore, the conductive portion 21 is located between the first welding strip 300 and the bus module 10, electrically connecting the first welding strip 300 to the bus bar; the insulating portion 22 is located between the second welding strip 400 and the bus module 10, insulating the second welding strip 400 from the bus module 10. In this way, the insulation or electrical connection between the bus module 10 and the welding strip can be simultaneously achieved through the connection module 20. Furthermore, the bus bar in the prior art can be replaced by the bus module 10 in the connection structure 100, and there is no need to add a thicker isolation strip. When the battery assembly 1001 is made, the thickness of the battery assembly 1001 can be reduced, thereby reducing the risk of hidden breakage and cracking of the battery cell 200 during the lamination process.

[0062] In a possible implementation, the conductive portion 21 includes a copper conductive portion 21, an aluminum conductive portion 21, or a copper-aluminum alloy conductive portion 21. In this way, the conductive portion 21 can provide good conductive performance for the connection structure 100, thereby improving the conductivity between the connection structure 100 and the first welding strip 300. Specifically, the conductive portion 21 can be a conductive portion 21 made of one or more of a copper substrate, an aluminum substrate, or a copper-aluminum alloy substrate, which is not limited here.

[0063] like Figure 4 As shown, in a possible embodiment, the connection module 20 includes protrusions 23 provided at both ends of the connection module 20, and the protrusions 23 abut against one end of the confluence module 10. In this way, the confluence module 10 can be positioned by the protrusions 23, thereby improving the manufacturing efficiency of the connection structure 100.

[0064] Specifically, the connection module 20 has protrusions 23 disposed at both ends of the connection module 20, and the protrusions 23 are disposed protrudingly. A groove structure for arranging the confluence module 10 is formed between two adjacent protrusions 23. In this way, the confluence module 10 can be positioned by the protrusions 23, and the confluence module 10 can be accurately arranged in the groove structure formed by the protrusions 23, thereby simplifying the manufacturing process of the connection structure 100, and further simplifying the manufacturing process of the battery assembly 1001, and improving the manufacturing efficiency of the battery assembly 1001.

[0065] Further, the protrusion 23 includes a copper protrusion 23, an aluminum protrusion 23 or a copper-aluminum alloy protrusion 23. Exemplarily, the protrusion 23 can be a protrusion 23 made of one or more of a copper substrate, an aluminum substrate or a copper-aluminum alloy substrate, which is not limited here.

[0066] like Figure 4 , Figure 6 and Fig. 9As shown, in a possible implementation, the plurality of insulating parts 22 include a first insulating part 221; the first insulating part 221 includes a first insulating layer 2211 and a second insulating layer 2212, the first insulating layer 2211 is arranged on the side of the second welding strip 400 away from the battery cell 200, and the second insulating layer 2212 is arranged on the side of the first insulating layer 2211 away from the second welding strip 400; the hardness of the second insulating layer 2212 is greater than the hardness of the first insulating layer 2211. In this way, the second insulating layer 2212 can provide stronger mechanical protection and pressure resistance to the first insulating part 221, thereby enhancing the pressure resistance and mechanical strength of the first insulating layer 2211; at the same time, the first insulating layer 2211 can serve as a buffer layer of the first insulating part 221. When the connection structure 100 is arranged in the battery assembly 1001, the first insulating layer 2211 can effectively absorb and disperse the mechanical stress generated when the battery assembly 1001 is laminated, thereby improving the mechanical strength and pressure resistance of the first insulating part 221.

[0067] Specifically, there are multiple insulating parts 22, and the multiple insulating parts 22 include a plurality of first insulating parts 221, and each first insulating part 221 includes a second insulating layer 2212 and a first insulating layer 2211 stacked in sequence. The first insulating layer 2211 is located between the second insulating layer 2212 and the second welding strip 400. In this way, the hardness of the second insulating layer 2212 is greater than the hardness of the first insulating layer 2211, so that the second insulating layer 2212 can provide the first insulating part 221 with strong impact resistance, pressure resistance and deformation resistance, and the first insulating layer 2211 can play a buffering role in the lamination process of the battery assembly 1001, absorb and disperse mechanical stress, and reduce stress concentration. The cooperation of the first insulating layer 2211 and the second insulating layer 2212 can effectively protect the second welding strip 400 from mechanical damage during lamination.

[0068] It can be understood that the hardness of the first insulating layer 2211 and the second insulating layer 2212 refers to the ability of the first insulating layer 2211 and the second insulating layer 2212 to resist deformation when subjected to external force (such as indentation or impact). A lower hardness means that the material is softer and can more effectively absorb and disperse mechanical stress, thereby playing a role in buffering protection; while a higher hardness indicates that the material is harder and more resistant to pressure, and can play a better role in withstanding pressure.

[0069] Further, the hardness of the first insulating layer 2211 may be 30Shore to 50Shore, for example, 30Shore, 35Shore, 40Shore, 45Shore, 50Shore. The hardness of the second insulating layer 2212 may be 60Shore to 990Shore, for example, 60Shore, 65Shore, 70Shore, 75Shore, 80Shore, 90Shore.

[0070] Exemplarily, the first insulating layer 2211 includes an EVA (ethylene-vinyl acetate copolymer) insulating layer, a TPE (thermoplastic elastomer) insulating layer, a TPU (thermoplastic polyurethane) insulating layer or a rubber insulating layer. Specifically, the first insulating layer 2211 can be an insulating layer made of one or more of EVA, TPE, TPU or rubber materials, which is not limited here.

[0071] Exemplarily, the second insulating layer 2212 includes a PET (polyethylene terephthalate) insulating layer, a PEN (polyethylene naphthalate) insulating layer, a PBT (polybutylene terephthalate) insulating layer or a PTT (polypropylene terephthalate) insulating layer. Specifically, the third insulating layer 2222 may be an insulating layer made of one or more materials of PET, PEN, PBT or PTT, which is not limited here.

[0072] like Figure 4 , Figure 7 and Fig.10 As shown, in a possible implementation, the plurality of insulating parts 22 include a second insulating part 222, the second insulating part 222 includes a pressure-sensitive adhesive layer 2221 and a third insulating layer 2222, the pressure-sensitive adhesive layer 2221 is disposed on the side of the second welding strip 400 away from the battery cell 200, and the third insulating layer 2222 is disposed on the side of the pressure-sensitive adhesive layer 2221 away from the second welding strip 400. In this way, the pressure-sensitive adhesive layer 2221 of the second insulating part 222 can provide an adhesive fixing function for the connection structure 100, so that when the connection structure 100 is arranged on the battery assembly 1001, it is convenient to position and fix the connection structure 100, thereby further simplifying the manufacturing process of the battery assembly 1001 and improving the manufacturing efficiency of the battery assembly 1001.

[0073] Specifically, there are multiple insulating parts 22, and the multiple insulating parts 22 include a plurality of second insulating parts 222, and each second insulating part 222 includes a third insulating layer 2222 and a pressure-sensitive adhesive layer 2221 stacked in sequence. The pressure-sensitive adhesive layer 2221 is located between the third insulating layer 2222 and the second welding strip 400. In this way, the connection structure 100 can be positioned and fixed by the pressure-sensitive adhesive layer 2221.

[0074] Furthermore, the hardness of the third insulating layer 2222 is greater than the hardness of the pressure-sensitive adhesive layer 2221, so that the third insulating layer 2222 can provide the second insulating part 222 with stronger impact resistance, pressure resistance and deformation resistance, and the pressure-sensitive adhesive layer 2221 can play a buffering role during the lamination process of the battery assembly 1001, absorb and disperse mechanical stress, and reduce stress concentration. Through the cooperation of the third insulating layer 2222 and the pressure-sensitive adhesive layer 2221, the second welding strip 400 can be effectively protected from mechanical damage during lamination.

[0075] Exemplarily, the third insulating layer 2222 includes a PET (polyethylene terephthalate) insulating layer, a PEN (polyethylene naphthalate) insulating layer, a PBT (polybutylene terephthalate) insulating layer or a PTT (polypropylene terephthalate) insulating layer. Specifically, the third insulating layer 2222 can be an insulating layer made of one or more of PET, PEN, PBT or PTT materials, which is not limited here.

[0076] Furthermore, the third insulating layer 2222 and the second insulating layer 2212 may be the same insulating layer. In this way, the manufacturing efficiency of the connection structure 100 may be improved.

[0077] like Figure 4 As shown, in a possible implementation, the number of the second insulating parts 222 is at least two. It is understandable that, because the pressure-sensitive adhesive layer 2221 can provide the second insulating part 222 with an adhesive fixing function, by setting the number of the second insulating part 222 to at least two, the connection structure 100 can have sufficient adhesive ability, which is convenient for positioning and fixing the connection structure 100. At the same time, the adhesion firmness of the connection can be improved, thereby improving the structural stability and reliability of the battery assembly 1001.

[0078] Specifically, when the number of the second insulating parts 222 is small, for example, when the number of the second insulating parts 222 is 2, 3, or 4, the spacing between two adjacent second insulating parts 222 can be increased. In this way, the stable connection of the connection structure 100 can be ensured, and the manufacturing cost can be reduced while ensuring the stability of the connection structure 100. For example, when the number of the second insulating parts 222 is 2, 6 to 10 first insulating parts 221 can be provided between two adjacent second insulating parts 222. For example, when the number of the second insulating parts 222 is 3, 4 to 8 first insulating parts 221 can be provided between two adjacent second insulating parts 222. For example, when the number of the second insulating parts 222 is 4, 2 to 6 first insulating parts 221 can be provided between two adjacent second insulating parts 222.

[0079] like Figure 4 As shown, in a possible implementation, the number of the second insulating parts 222 is greater than the number of the first insulating parts 221. This can improve the bonding ability of the connection structure 100, thereby improving the adhesion firmness of the connection, and further improving the structural stability and reliability of the battery assembly 1001.

[0080] Furthermore, all of the multiple insulating parts 22 cannot be the second insulating part 222. In this way, it can be avoided that when the connection structure 100 is arranged on the battery assembly 1001, the battery assembly 1001 will have bulges or depressions after lamination. It can be understood that since the thickness of the pressure-sensitive adhesive layer 2221 is relatively thin, when all of the multiple insulating parts 22 are the second insulating part 222, the pressure-sensitive adhesive layer 2221 in the second insulating part 222 cannot effectively fill the thickness difference of the conductive part 21, which will cause the battery assembly 1001 to have bulges or depressions after lamination. Therefore, through the combination of the first insulation and the second insulating part 222, it is possible to ensure the bonding stability of the connection structure 100 while providing a thickness difference to support the conductive part 21, thereby ensuring the long-term reliability of the battery assembly 1001.

[0081] Furthermore, the conductive part 21 includes a conductive groove 2101 corresponding to the structure of the first soldering strip 300. In this way, a stable connection with the first soldering strip 300 can be achieved through the conductive groove 2101, thereby improving the conductive connectivity between the first soldering strip 300 and the conductive part 21.

[0082] like Fig.11 As shown, specifically, the conductive part 21 can be made into a groove structure, and the conductive groove 2101 corresponds to the junction of the first welding strip 300. The existence of the conductive groove 2101 can help to accurately locate the positions of the conductive part 21 and the first welding strip 300, while ensuring that the setting stability of the first welding strip 300 is improved and the deviation of the first welding strip 300 is reduced.

[0083] like Fig.12 and Fig.13 As shown, further, the insulating portion 22 includes an insulating groove 2201 corresponding to the structure of the second welding strip 400. In this way, stable insulation with the second welding strip 400 can be achieved through the insulating groove 2201, thereby improving the insulation between the second welding strip 400 and the insulating portion 22.

[0084] Specifically, the second insulating layer 2212 in the first insulating part 221 and the pressure-sensitive adhesive layer 2221 in the second insulating part 222 can be made into a groove structure, and the insulating groove 2201 corresponds to the junction of the second welding strip 400. The existence of the insulating groove 2201 can help to accurately locate the position of the insulating part 22 and the second welding strip 400, while ensuring the improvement of the setting stability of the second welding strip 400 and reducing the deviation of the second welding strip 400.

[0085] The battery assembly 1001 of the embodiment of the present invention includes a battery cell 200, a plurality of first welding strips 300 and a plurality of second welding strips 400, and the above-mentioned connection structure 100. The first welding strip 300 and the second welding strip 400 are arranged on the battery cell 200, the connection structure 100 is arranged on the side of the first welding strip 300 and the second welding strip 400 away from the battery cell 200, the conductive part 21 conductively connects the bus module 10 and the first welding strip 300, and the insulating part 22 insulates the bus module 10 and the second welding strip 400. In this way, the battery assembly 1001 in the embodiment of the present invention is provided with a connection structure 100 including a bus module 10 and a connection module 20. The bus module 10 and the first welding strip 300 are conductively connected by the conductive part 21 of the connection module 20, and the bus module 10 and the second welding strip 400 are insulated by the insulating part 22 of the connection module 20. This can avoid separately setting bus bars and insulating parts, and further reduce the number of connecting elements in the battery assembly 1001, thereby simplifying the manufacturing process of the battery assembly 1001 and improving the manufacturing efficiency of the battery assembly 1001.

[0086] like Figure 3 As shown, in a possible implementation, the width of the conductive portion 21 is greater than the width of the first soldering strip 300. In this way, the conductivity between the conductive portion 21 and the first soldering strip 300 can be improved, and a stable conductive connection between the conductive portion 21 and the first soldering strip 300 can be achieved.

[0087] like Figure 3 As shown, in a possible implementation, the width of the insulating portion 22 is greater than the width of the second welding strip 400. In this way, the insulation between the insulating portion 22 and the second welding strip 400 can be improved, and stable insulation between the insulating portion 22 and the second welding strip 400 can be achieved.

[0088] like Figure 1 and Figure 2 As shown, in a possible implementation, there are multiple battery cells 200, and two adjacent battery cells 200 partially overlap. In this way, the spacing between adjacent battery cells 200 in the battery assembly 1001 can be eliminated.

[0089] like Figure 1 and Figure 2 As shown, in a possible implementation, the connection structure 100 is disposed on the backlight surface of the battery cell 200. In this way, the connection structure 100 can be hidden, thereby effectively eliminating the front surface of the battery cell 200, making it smoother and simpler, thereby improving the overall aesthetics of the battery assembly 1001.

[0090] It is understandable that in such an embodiment, the battery assembly 1001 may also include a frame, a back plate, a photovoltaic glass and an adhesive film. The adhesive film may be filled between the front and back surfaces of the battery cell 200 and the photovoltaic glass, adjacent battery cells 200, etc. As a filler, it may be a transparent colloid with good light transmission and aging resistance. For example, the adhesive film may be an EVA adhesive film or a POE adhesive film, which may be selected according to actual conditions and is not limited here.

[0091] Photovoltaic glass can cover the adhesive film on the front side of the cell 200. The photovoltaic glass can be ultra-white glass, which has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of ultra-white glass can reach more than 92%, which can protect the cell 200 without affecting the efficiency of the cell 200 as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the cell 200 together, and the existence of the adhesive film can seal and insulate the cell 200 and prevent water and moisture.

[0092] The backplane can be attached to the adhesive film on the backlight surface of the battery cell 200. The backplane can protect and support the battery cell 200 and has reliable insulation, water resistance and aging resistance. There are multiple options for the backplane, which can usually be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc. It can be set according to specific circumstances and is not limited here. The whole composed of the backplane, battery cell 200, adhesive film and photovoltaic glass can be set on the frame. The frame serves as the main external support structure of the entire battery assembly 1001 and can provide stable support and installation for the battery assembly 1001. For example, the battery assembly 1001 can be installed at the required location through the frame.

[0093] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] In addition, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure for a battery assembly, characterized in that: The battery assembly comprises a plurality of battery cells, a plurality of first welding strips and a plurality of second welding strips, wherein the first welding strips and the second welding strips are arranged on the backlight surface of the battery cells, the connection structure is arranged on the side of the first welding strips and the second welding strips away from the battery cells, the connection structure is conductively connected to the first welding strips, and the connection structure is insulated from the second welding strips; Wherein, the connection structure comprises a bus module and a connection module, the connection module is used to be arranged on a side of the first welding strip and the second welding strip away from the battery cell, and the bus module is used to be arranged on a side of the connection module away from the first welding strip and the second welding strip; The connection module includes a plurality of conductive parts and a plurality of insulating parts, the conductive parts and the insulating parts are arranged alternately, the conductive parts are used to conductively connect the bus module and the first welding strip, and the insulating parts are used to insulate the bus module and the second welding strip.

2. The connection structure according to claim 1, characterized in that: The plurality of insulating portions include a first insulating portion; The first insulating portion comprises a first insulating layer and a second insulating layer, the first insulating layer is arranged on a side of the second welding strip away from the battery cell, and the second insulating layer is arranged on a side of the first insulating layer away from the second welding strip; The second insulating layer has a harderness than the first insulating layer.

3. The connection structure according to claim 2, characterized in that: The first insulating layer includes an EVA insulating layer, a TPE insulating layer, a TPU insulating layer or a rubber insulating layer.

4. The connection structure according to claim 2, characterized in that: The second insulating layer includes a PET insulating layer, a PEN insulating layer, a PBT insulating layer or a PTT insulating layer.

5. The connection structure according to claim 2, characterized in that: The multiple insulating parts include a second insulating part, the second insulating part includes a pressure-sensitive adhesive layer and a third insulating layer, the pressure-sensitive adhesive layer is arranged on the side of the second welding strip away from the battery cell, and the third insulating layer is arranged on the side of the pressure-sensitive adhesive layer away from the second welding strip.

6. The connection structure according to claim 5, characterized in that: The third insulating layer includes a PET insulating layer, a PEN insulating layer, a PBT insulating layer or a PTT insulating layer.

7. The connection structure according to claim 5, characterized in that: The number of the second insulating parts is at least two.

8. The connection structure according to claim 5, characterized in that: The number of the second insulating parts is greater than the number of the first insulating parts.

9. The connection structure according to claim 1, characterized in that: The connection module includes protrusions arranged at two ends of the connection module, and the protrusions abut against one end of the confluence module.

10. The connection structure according to claim 1, characterized in that: The conductive portion includes a conductive groove corresponding to the structure of the first welding strip.

11. The connection structure according to claim 1, characterized in that: The insulating portion includes an insulating groove corresponding to the structure of the second welding strip.

12. The connection structure according to claim 1, characterized in that: The bus module includes a tin solder layer, a tin-bismuth alloy solder, a tin-lead alloy solder layer or a tin-bismuth-lead alloy solder layer.

13. The connection structure according to claim 1, characterized in that: The conductive part includes a copper conductive part, an aluminum conductive part or a copper-aluminum alloy conductive part.

14. A battery assembly, characterized in that: The battery assembly includes a battery cell, a plurality of first welding strips and a plurality of second welding strips, and a connection structure as claimed in any one of claims 1 to 13.

15. The battery assembly according to claim 14, characterized in that: The width of the conductive portion is greater than the width of the first welding strip.

16. The battery assembly according to claim 14, characterized in that: The width of the insulating portion is greater than the width of the second welding strip.

17. The battery assembly according to claim 14, characterized in that: There are multiple battery cells, and two adjacent battery cells partially overlap.

18. The battery assembly according to claim 14, characterized in that: The connection structure is arranged on the backlight surface of the battery cell.

19. A photovoltaic system, characterized in that: The photovoltaic system comprises the battery assembly according to any one of claims 14 to 18.

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