Bus bar leading-out structure and battery assembly

Abstract

The utility model is suitable for the technical field of photovoltaic cells, and provides a bus bar leading-out structure and a cell assembly, the bus bar leading-out structure comprises a bus bar and a leading-out wire, the bus bar and the leading-out wire are in an integrated structure; the outgoing line comprises a connecting part and a lead part, the connecting part is connected with the bus bar, the connecting part and the bus bar are stacked and attached to each other, and the connecting position of the connecting part and the bus bar is flat and free of protrusions; and the lead part is formed by bending the free end of the outgoing line. As the connecting part and the bus bar are integrally formed and attached to each other, and the connecting position of the connecting part and the bus bar is flat and has no bulge, the design ensures that the bus bar and the outgoing line are uniformly stressed in the laminating process, reduces the problems of cell cracking, deviation or pseudo soldering and the like caused by unevenness or bulge, improves the production quality, and reduces the production cost. And the bus bar and the outgoing line are integrally formed, and the bent part can be pre-processed and formed, so that the subsequent welding steps are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cells, and in particular relates to a busbar lead-out structure and a cell assembly. Background Art

[0002] In photovoltaic cells, bus bars are arranged on the cells to connect the cells and can effectively collect current from each cell so as to output it to the junction box or the main cable of the solar panel.

[0003] In order to avoid short circuit between two adjacent bus bars, the bus bars are usually bent 180° in the opposite direction to the outside of the backplane (such as Figure 1 As shown in the figure). At the bend, since the busbar itself is made of metal and has a certain thickness, the bend will form a certain arc. During the lamination process, due to uneven force, it is easy to cause problems such as battery cell cracking, offset and cold welding. Or after lamination, "L"-shaped lead wire welding (such as Figure 2 As shown in the figure, the investment in welding equipment after lamination is increased, the operation is cumbersome, and if the welding points are not properly welded, the long-term reliability of the components will be affected. Utility Model Content

[0004] The utility model provides a busbar lead-out structure and a battery assembly, aiming to solve the problem that the traditional method is prone to cause battery cell cracking, offset cold welding or cumbersome later welding operation, which affects the long-term reliability of the assembly.

[0005] The utility model is implemented as follows: a busbar lead-out structure comprises a busbar and a lead-out wire, wherein the busbar and the lead-out wire are an integrally formed structure;

[0006] The lead wire comprises a connecting portion and a lead portion, the connecting portion is connected to the bus bar, the connecting portion and the bus bar are stacked and attached to each other, and the connecting position between the connecting portion and the bus bar is flat and has no protrusions;

[0007] The lead wire portion is formed by bending the free end of the lead wire.

[0008] In one embodiment, the connection portion is stacked with the bus bar by stamping.

[0009] In one embodiment, a bending angle between the lead portion and the connecting portion is less than 90°.

[0010] The utility model also provides a battery assembly, comprising a back plate and the above-mentioned busbar lead-out structure, wherein a lead-out hole for the lead-out wire to extend out is arranged on the back plate.

[0011] In one embodiment, the wire outlet hole is a square hole.

[0012] In one embodiment, the projection of any pair of parallel sides of the outlet hole on the bus bar is perpendicular to the bus bar.

[0013] In one embodiment, the battery assembly further comprises a junction box, wherein a diode is arranged in the junction box;

[0014] Two lead wires extend out of each lead hole, and the parallel spacing between the lead wires is adapted to the width of the solder joints at both ends of the diode.

[0015] In one embodiment, the width of the lead wire matches the width of the access port of the junction box.

[0016] In one embodiment, the width of the connecting portion is greater than or equal to 1.5 mm and less than or equal to 12 mm.

[0017] The beneficial effect achieved by the utility model is that the connecting part and the bus bar are integrally formed and fit each other, and the connecting position between the two is flat and has no protrusions. This design ensures that the bus bar and the lead wire are subjected to uniform force during the lamination process, reduces problems such as battery cell cracking, offset or cold welding caused by unevenness or protrusions, improves production quality, and the bus bar and the lead wire are integrally formed, the bending part can be pre-processed and formed, reducing subsequent welding steps, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a busbar lead-out structure before and after lamination provided by the prior art;

[0019] Figure 2 It is a schematic diagram of another busbar lead-out structure provided by the prior art before and after lamination;

[0020] Figure 3 It is a schematic diagram of the structure of the busbar lead-out structure provided by the utility model before and after lamination;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the battery assembly provided by the utility model.

[0022] Description of reference numerals:

[0023] 100, bus bar lead structure; 101, bus bar; 102, lead wire; 1021, connection part; 1022, lead wire part;

[0024] 200, battery assembly; 201, back panel; 2011, wire outlet hole; 202, battery cell. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0027] 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 technical features indicated. 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 utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 utility model can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0031] In the present invention, the connecting portion and the bus bar are integrally formed and fit together, and the connecting position of the two is flat and has no protrusions. This design ensures that the bus bar and the lead wire are subjected to uniform force during the lamination process, reduces problems such as battery cell cracking, offset or cold welding caused by unevenness or protrusions, improves production quality, and the bus bar and the lead wire are integrally formed, and the bending parts can be pre-processed and formed, which reduces subsequent welding steps, thereby improving production efficiency.

[0032] Embodiment 1

[0033] like Figure 3 As shown, this embodiment provides a busbar lead-out structure 100, a busbar 101 and a lead-out line 102, and the busbar 101 and the lead-out line 102 are an integrally formed structure;

[0034] The lead wire 102 includes a connection portion 1021 and a lead portion 1022. The connection portion 1021 is connected to the bus bar 101. The connection portion 1021 and the bus bar 101 are stacked and attached to each other. The connection position between the connection portion 1021 and the bus bar 101 is flat and has no protrusions.

[0035] The lead portion 1022 is formed by bending the free end of the lead wire 102 .

[0036] The bus bar 101 is usually used to collect and conduct the current generated by the photovoltaic panel. It is responsible for collecting the current from the battery cell 202 to the junction box or electrical connection system so as to transmit the electric energy to the power grid or other purposes. Due to the position design requirements of the bus bar 101 and the junction box, the lead wire 102 is required to connect the circuit between the bus bar 101 and the junction box.

[0037] The bus bar 101 and the lead wire 102 are integrally formed, and specifically, the lead wire 102 is a portion extending from the free end of the bus bar 101. The bus bar 101 and the lead wire 102 are integrally formed to ensure that there is no welding point between the connection portion 1021 and the lead portion 1022, thereby reducing the long-term reliability problem caused by poor welding.

[0038] The lead wire 102 includes a connection portion 1021 and a lead portion 1022. The connection portion 1021 is disposed between the bus bar 101 and the lead portion 1022, and is used to connect the bus bar 101 and the lead portion 1022. Specifically, the connection portion 1021 may be formed by folding the free end of the bus bar 101 by 180 degrees. The opposite surfaces of the lead portion 1022 and the bus bar 101 are bonded to each other, and the connection position of the connection portion 1021 and the bus bar 101 is also bonded to avoid forming a bulge facing away from the bonding surface.

[0039] One end of the lead wire 102 is connected to the bus bar 101, and the other end is a free end. The free end of the lead wire 102 is bent away from the bus bar 101 to form a lead portion 1022. Since one side of the lead wire 102 is in close contact with the bus bar 101, when the lead wire 102 is bent away from the bus bar 101, the bus bar 101 provides a limit for the lead wire 102 to prevent the lead wire 102 from forming a convex bulge toward the bus bar 101 during the bending process. Specifically, the bending position of the connection portion 1021 and the lead portion 1022 can be bent into an arc surface or an angle.

[0040] In this embodiment, since the connecting portion 1021 and the bus bar 101 are integrally formed and fit together, the connecting position between the two is flat and has no protrusions. This design ensures that the bus bar 101 and the lead wire 102 are subjected to uniform force during the lamination process, reduces problems such as battery cell 202 cracking, offset or cold welding caused by unevenness or protrusions, and improves production quality. In addition, the bus bar 101 and the lead wire 102 are integrally formed, and the bending parts can be pre-processed and formed, which reduces the subsequent welding steps, thereby improving production efficiency.

[0041] In one embodiment, the connection portion 1021 is stacked with the bus bar 101 by stamping.

[0042] Stamping is a common metal processing process that applies high pressure to metal materials to cause them to deform plastically, thereby shaping them into the desired shape. This process is usually completed using a punch or press machine and can be applied to a variety of metal materials, including steel, aluminum, copper, etc. Stamping has the advantages of high efficiency, precision, low cost, and strong mass production capacity, and is particularly suitable for the processing of some thin-walled parts.

[0043] The busbar 101 and the lead wire 102 are thin-walled parts formed in one piece with strong plasticity. The stacking arrangement of the connecting portion 1021 and the busbar 101 is achieved by stamping, which can make the contact surface between the two smoother and tighter, effectively reduce the contact resistance, and enhance the current transmission efficiency.

[0044] Embodiment 2

[0045] Based on the first embodiment, the bending angles of the lead portion 1022 and the connecting portion 1021 are less than 90°.

[0046] The busbar 101 lead-out structure is arranged on the photovoltaic module to provide connection and conduction for the photovoltaic module. The busbar 101 lead-out structure is connected to the photovoltaic module for lamination. After lamination, the lead portion 1022 is perpendicular to the connection portion 1021, which is convenient for subsequent connection. The bending angle of the lead portion 1022 and the connection portion 1021 is less than 90°, which is convenient for the subsequent lamination process.

[0047] Embodiment 3

[0048] like Figure 4 As shown, this embodiment further provides a battery assembly 200, including a back plate 201 and the above-mentioned bus bar 101 lead-out structure, and a lead-out hole 2011 for the lead-out wire 102 to extend out is provided on the back plate 201.

[0049] In the battery assembly 200, the back plate 201 is an important structural component, which provides the necessary mechanical support for the battery assembly 200, enhances the overall rigidity and strength of the assembly, and effectively protects the internal battery cells 202, leads and other sensitive components from external impacts and influences.

[0050] The wire outlet hole 2011 opened on the back plate 201 is used for the lead wire 102 to extend out, ensuring that the lead part 1022 and the connecting part 1021 can be smoothly connected to the external circuit.

[0051] In one embodiment, the outlet hole 2011 is a square hole, which can be a square hole or a rectangular hole. The square hole can perfectly match the lead-out structure of the busbar 101, ensuring that the lead portion 1022 and the connection portion 1021 can be accurately and firmly installed in place, avoiding installation difficulties or poor connections caused by inaccurate hole positions. The square hole can also provide good structural stability and strength, ensuring that it is not easy to deform or damage during the transportation and installation of the component.

[0052] Specifically, the projection of any pair of parallel sides of the outlet hole 2011 on the bus bar 101 is perpendicular to the bus bar 101. This ensures accurate alignment between the outlet hole 2011 and the bus bar 101, making the electrical connection more reliable, avoiding poor contact caused by misalignment, and improving the electrical performance and safety of the component.

[0053] Embodiment 4

[0054] On the basis of the third embodiment, the battery assembly 200 further includes a junction box, in which a diode is arranged;

[0055] Two lead wires 102 extend from each lead hole 2011 , and the parallel spacing between the lead wires 102 matches the width of the solder joints at both ends of the diode.

[0056] The junction box is an important part of the battery assembly 200, mainly used to protect the electrical connection points from the external environment (such as moisture, dust and mechanical damage). It provides a safe and reliable electrical connection platform for the battery assembly 200. The diode is set in the junction box, mainly to prevent the reverse current from damaging the battery assembly 200 and to ensure that the current output by each component is not wasted, thereby improving the efficiency and power generation of the entire photovoltaic system.

[0057] One pin of the diode is connected to a bus bar 101, and the other pin is connected to another bus bar 101. In this way, under normal working conditions, current is transmitted through the bus bar 101; when reverse current occurs, the diode can play a blocking role. The spacing of the bus bar 101 and the width of the welding points at both ends of the diode must be matched, so as to ensure that the pins of the diode can be accurately welded to the bus bar 101 and ensure the reliability of the electrical connection.

[0058] Embodiment 5

[0059] On the basis of the fourth embodiment, the width of the lead wire 102 is adapted to the width of the access port of the junction box.

[0060] The lead wire 102 needs to pass through the access port of the junction box and be connected to the diode in the junction box. Usually, in order to ensure the airtightness of the junction box, the access port of the junction box is narrow, and the width of the lead wire 102 is adapted to the width of the access port of the junction box, so that the lead wire 102 can be smoothly inserted into the junction box.

[0061] In actual operation, since the lead wire 102 is extended from the bus bar 101, the width of the lead wire 102 is consistent with the width of the bus bar 101, and the width of the bus bar 101 is usually greater than the width of the access port of the junction box, the lead wire 102 can be trimmed so that the width of the lead wire 102 is compatible with the width of the access port of the junction box. The trimming can be performed along one side of the lead wire 102, or along both sides of the lead wire 102, which is selected according to the actual situation.

[0062] Embodiment 6

[0063] Based on the third embodiment, the width of the connecting portion 1021 is greater than or equal to 1.5 mm and less than or equal to 12 mm.

[0064] When the width of the connection portion 1021 is less than 1.5 mm, it is inconvenient to perform a bending operation on the connection portion 1021 , and when the width of the connection portion 1021 is too wide, it is not conducive to the installation of the junction box body.

[0065] The above are only preferred embodiments of the present invention and are 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 busbar lead-out structure, characterized in that: It includes a bus bar and a lead wire, wherein the bus bar and the lead wire are an integrally formed structure; The lead wire comprises a connecting portion and a lead portion, the connecting portion is connected to the bus bar, the connecting portion and the bus bar are stacked and attached to each other, and the connecting position between the connecting portion and the bus bar is flat and has no protrusions; The lead wire portion is formed by bending the free end of the lead wire.

2. The busbar lead-out structure according to claim 1, characterized in that: The connection portion is stacked with the bus bar by stamping.

3. The busbar lead-out structure according to claim 1, wherein: The bending angles of the lead portion and the connecting portion are smaller than 90°.

4. A battery assembly, characterized in that: The invention comprises a back plate and a busbar lead-out structure as claimed in any one of claims 1 to 3, wherein the back plate is provided with a lead-out hole for the lead-out wire to extend out.

5. The battery assembly according to claim 4, characterized in that: The wire outlet hole is a square hole.

6. The battery assembly according to claim 5, characterized in that: The projection of any pair of parallel sides of the outlet hole on the bus bar is perpendicular to the bus bar.

7. The battery assembly according to claim 4, characterized in that: The battery assembly also includes a junction box, in which a diode is arranged; Two lead wires extend out of each lead hole, and the parallel spacing between the lead wires is adapted to the width of the solder joints at both ends of the diode.

8. The battery assembly according to claim 7, characterized in that: The width of the lead-out wire is adapted to the width of the access port of the junction box.

9. The battery assembly according to claim 4, characterized in that: The width of the connecting portion is greater than or equal to 1.5 mm and less than or equal to 12 mm.

Images