Connecting circuit of photovoltaic cell and photovoltaic module

Abstract

The utility model relates to a photovoltaic cell connecting circuit and a photovoltaic assembly, comprising a main circuit and a bypass, the main circuit comprises a diode and a plurality of cells connected in series, and the diode is connected in parallel with the cells; the bypass comprises at least one super capacitor which is connected in series, and each super capacitor is connected with a first resistor in parallel; wherein the main path and the bypass are connected in parallel. By adopting the scheme, the super capacitor is connected in series in the bypass, the super capacitor can complete a frequency modulation instruction of a short time scale, and the super capacitor can quickly modulate frequency and stabilize voltage, so that the effects of peak regulation, peak clipping and valley filling are achieved; the super capacitor is connected in parallel with the first resistor, so that a voltage dividing effect is achieved; in addition, the main path and the bypass are separately arranged, and the super capacitor is arranged on the bypass, so that the influence of the additional bypass on the main path is reduced, the improvement on the existing structure or the conventional part is facilitated, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a connection circuit of photovoltaic cells and a photovoltaic module. Background Art

[0002] At present, in the case of shading of solar photovoltaic modules, especially when the entire bypassed battery string is "quasi-simultaneously" shaded, it will cause instantaneous voltage and current changes, and the voltage and current will undergo "cliff-like" mutations. In response to this "mutation", existing modules do not have corresponding anti-variation designs. Photovoltaic modules have a temperature coefficient response. When their temperature rises significantly, it also significantly affects the current and voltage changes of the battery, easily causing current mutations, thereby affecting the current performance of the entire system. Summary of the Utility Model

[0003] Based on this, a connection circuit of photovoltaic cells and a photovoltaic module are provided to improve the problem that when the photovoltaic module in the prior art is shaded, the bypass diode conducts, thereby causing large changes in current and voltage.

[0004] On the one hand, the utility model provides a connection circuit of photovoltaic cells, including:

[0005] A main circuit, the main circuit includes a diode and a plurality of serially connected battery cells, and the diode is connected in parallel with the battery cells;

[0006] A bypass, the bypass includes at least one super capacitor connected in series, and each super capacitor is connected in parallel with a first resistor;

[0007] Wherein, the main circuit and the bypass are connected in parallel.

[0008] In one implementation, the bypass further includes:

[0009] A thermistor, the thermistor is connected in series with the super capacitor.

[0010] On the basis of the above technical solution, the utility model can also be improved as follows.

[0011] In one implementation, the main circuit further includes:

[0012] A thermistor, the thermistor is connected in series with the battery cells.

[0013] In one implementation, the plurality of serially connected battery cells are divided into at least one group, and each group of battery cells is connected in parallel with a diode.

[0014] On the other hand, the utility model also provides a photovoltaic module, including a photovoltaic cell connection circuit, and further including:

[0015] An encapsulation component, used to fix and encapsulate the main circuit;

[0016] A frame component for fixing a bypass, the frame component surrounding the outer periphery of the encapsulation component.

[0017] In one implementation, the frame component has a rectangular structure and includes:

[0018] Long side frames and short side frames,

[0019] Connecting corner pieces for connecting adjacent long side frames and short side frames, the connecting corner pieces being L-shaped;

[0020] Cross beams for supporting the encapsulation component, the two ends of the cross beam being respectively connected to two long side frames arranged in parallel;

[0021] Fixing blocks for supporting the cross beam and being snap-connected to the long side frames.

[0022] In one implementation, the cross beam is filled with heat storage material.

[0023] In one implementation, the long side frame includes:

[0024] A first card slot for snap-connecting the fixing block;

[0025] A second card slot for snap-connecting the encapsulation component;

[0026] Wherein, the first card slot is located below the second card slot, and both the first card slot and the second card slot are C-shaped slots with a single-sided opening, and the opening directions are both towards the middle of the frame component.

[0027] In one implementation, the frame component further includes:

[0028] A spring piece for supporting the lower part of the cross beam and pressing the encapsulation component into the second card slot;

[0029] Wherein, a card slot is provided in the middle of the fixing block, the lower part of the spring piece is U-shaped and is used for being inserted into the card slot, and the top of the spring piece is flat and is used for supporting the cross beam.

[0030] In one implementation, the short side frame includes:

[0031] A third card slot, the opening direction of the third card slot being towards the middle of the frame component, and the third card slot being used for accommodating one side of the L-shaped connecting corner piece;

[0032] Wherein, the other L-shaped side of the connecting corner piece extends into the first card slot.

[0033] In one implementation, at least one deformable pressure strip is connected to the top surface of the second card slot, the end of the pressure strip inclines towards the middle of the second card slot, and the end of the top surface of the second card slot also inclines towards the middle of the second card slot; a V-shaped snap-connection structure is provided between the lower part of the first card slot and the fixing block.

[0034] The beneficial effects of the present utility model are as follows: By connecting a super capacitor in series in the bypass, the super capacitor can complete the frequency modulation command on a short time scale. The super capacitor can quickly adjust the frequency and stabilize the voltage, playing the role of peak shaving and valley filling; A first resistor is connected in parallel with the super capacitor to achieve the effect of voltage division; In addition, by separately setting the main path and the bypass, and arranging the super capacitor in the bypass, the influence of adding the bypass on the main path is reduced, which is convenient for improvement on the existing structure or conventional components, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the main path of the connection line of the photovoltaic cell in an embodiment;

[0036] Figure 2 It is a schematic diagram of the bypass of the connection line of the photovoltaic cell in an embodiment;

[0037] Figure 3 It is a schematic diagram of the structure of the frame assembly of the connection line of the photovoltaic cell in an embodiment;

[0038] Figure 4 For Figure 3 It is a partial sectional structure diagram of the frame assembly in

[0039] Figure 5 For Figure 4 It is a partial enlarged view of the end part in

[0040] Figure 6 It is a sectional structure diagram of the long side frame;

[0041] Figure 7 For Figure 3 It is a partial enlarged view of the connection position of the cross beam;

[0042] Figure 8 It is a schematic diagram of the structure of the fixing block;

[0043] Figure 9 It is a schematic diagram of the structure of the elastic piece.

[0044] In the drawings, the components represented by the reference numerals are as follows:

[0045] 10. Main path; 11. Diode; 12. Battery cell;

[0046] 20. Bypass; 21. Super capacitor; 22. First resistor; 23. Thermistor;

[0047] 40. Frame assembly; 41. Connecting angle piece; 42. Cross beam; 43. Elastic piece;

[0048] 44. Long side frame; 44-1. First card slot; 44-2. Second card slot; 44-3. Pressure strip;

[0049] 45. Short side frame; 45-1. Third card slot;

[0050] 46. Fixed block; 46-1. Clamping groove. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] Embodiment 1:

[0053] A connection circuit of a photovoltaic cell, see Figure 1 and Figure 2 , including: a main circuit 10 and a bypass circuit 20. The main circuit 10 includes a diode 11 and a plurality of serially connected solar cells 12, and the diode 11 is connected in parallel with the solar cells 12; the bypass circuit 20 includes at least one super capacitor 21 connected in series, and each super capacitor 21 is connected in parallel with a first resistor 22; wherein, the main circuit 10 and the bypass circuit 20 are connected in parallel.

[0054] The beneficial effect of this embodiment is that: by connecting the super capacitor 21 in series in the bypass circuit 20, the super capacitor 21 can complete the frequency modulation command on a short time scale, and the super capacitor 21 can quickly perform frequency modulation and stabilize the voltage, playing the role of peak shaving and valley filling; a first resistor 22 is connected in parallel with the super capacitor 21 to achieve the effect of voltage division; in addition, by separately providing the main circuit 10 and the bypass circuit 20 and arranging the super capacitor 21 in the bypass circuit 20, the influence of adding the bypass circuit 20 on the main circuit 10 is reduced, which is convenient for improvement on the existing structure or conventional components, thereby reducing costs.

[0055] In some embodiments, see Figure 1 and Figure 2 , the bypass circuit 20 further includes a thermistor 23, and the thermistor 23 is connected in series with the super capacitor 21. In this way, in the photovoltaic system, under normal circumstances, neither the diode 11 nor the thermistor 13 works, and the super capacitor 21 stores charge when there is voltage in the main circuit 10. When the occlusion is large enough, the bypass circuit connected in parallel with it conducts, the solar cells 12 become loads, and the charge stored by the super capacitor 21 is released by the conducting diode 11, and the flowing current is regulated by the thermistor, thereby regulating the uniformity of the current release of the super capacitor 21.

[0056] See Figure 1 and Figure 2 , Figure 1 The capacitance symbol in the bypass circuit 20 in Figure 2 shows the schematic of the overall structure in

[0057] In some embodiments, seeFigure 1 and Figure 2 The multiple series-connected cell pieces 12 are divided into at least one group, and a diode 11 is connected in parallel to each group of cell pieces 12. In this way, by separately arranging multiple groups of cell pieces 12 and connecting a diode 11 to each group of cell pieces 12 individually, the stability of the cell pieces 12 during photovoltaic power generation operation is improved; the diode 11 is provided to play a role of unidirectional conduction.

[0058] In the embodiment, referring to Figure 1 and Figure 2 The multiple series-connected cell pieces 12 are evenly divided into three groups connected in series in sequence. In this way, the specific number of groups of cell pieces 12 can be adjusted according to the number of series-connected cell pieces 12.

[0059] Based on the above embodiment, there are sixty cell pieces 12, and each group of cell pieces 12 has 24.

[0060] Embodiment Two:

[0061] A photovoltaic module, referring to Figure 3 includes a photovoltaic cell connection line, and further includes: a packaging component and a frame component 40. The packaging component is used to fix and encapsulate the main circuit 10, and the frame component 40 is used to fix the bypass 20. The frame component 40 surrounds the outer periphery of the packaging component. In this way, the packaging component is provided to encapsulate the series of cell pieces 12, the frame component 40 is provided to fix the bypass 20, and then the frame component 40 surrounds the outer periphery of the packaging component to enclose the photovoltaic module.

[0062] Based on the above embodiment, after the packaging component encapsulates the main circuit 10, a front plate glass, a packaging material, the main circuit 10, a packaging material, and a rear plate glass are sequentially arranged along its thickness direction, and an integral body is formed through a heat-sealing process, that is, the formed glass bonding plate is fixed through a lamination process.

[0063] In some embodiments, referring to Figure 3 and Figure 7 the frame component 40 has a rectangular structure. The frame component 40 includes long side frames 44, short side frames 45, connecting corner pieces 41, cross beams 42, and fixing blocks 46. The connecting corner pieces 41 are used to connect adjacent long side frames 44 and short side frames 45, and the connecting corner pieces 41 are in an L shape; the cross beams 42 are used to support the packaging component, and both ends of the cross beams 42 are respectively connected to two parallelly arranged long side frames 44; the fixing blocks 46 are used to support the cross beams 42 and are snap-connected to the long side frames 44. In this way, the frame component 40 has a rectangular structure and is surrounded by alternately connecting long side frames 44 and short side frames 45. The connecting corner pieces 41 are used to connect adjacent long side frames 44 and short side frames 45 and improve the stability after connection of the long side frames 44 and short side frames 45. The fixing blocks 46 are provided to support the cross beams 42 and assist in fixing the cross beams 42. The two long side frames 44 are connected through the cross beams 42, and the top surface of the cross beams 42 is used to place the packaging component.

[0064] On the basis of the above embodiments, the connecting corner piece 41 is a hollow frame structure, and the bypass 20 is fixed on the short side frame 45.

[0065] In some embodiments, referring to Figure 6 , the long side frame 44 includes a first card slot 44-1 and a second card slot 44-2 opened along its length direction. The first card slot 44-1 is used for clamping and fixing the fixing block 46, and the second card slot 44-2 is used for clamping the encapsulation component; wherein, the first card slot 44-1 is located below the second card slot 44-2, and both the first card slot 44-1 and the second card slot 44-2 are C-shaped slots with one-sided openings, and the opening directions are both towards the middle of the frame component 40. In this way, the long side frame 44 clamps the fixing block 46 through the first card slot 44-1, and the long side frame 44 clamps the encapsulation component through the second card slot 44-2. The first card slot 44-1 is located below the second card slot 44-2, so that the fixing block 46 can support the encapsulation component; both the first card slot 44-1 and the second card slot 44-2 are C-shaped slots with one-sided openings, reducing the opening positions of the card slots and improving the stability after the first card slot 44-1 and the second card slot 44-2 are clamped.

[0066] On the basis of the above embodiments, referring to Figure 8 , the shape of the fixing block 46 is square and hollow in the middle, which has the effect of reducing weight and is convenient for the fixing block 46 to generate a certain deformation, facilitating the tight fit between the fixing block 46 and the first card slot 44-1.

[0067] In some embodiments, referring to Figure 7 and Figure 9 , the frame component 40 further includes a spring piece 43. The spring piece 43 is used to support the lower part of the cross beam 42 and press the encapsulation component in the second card slot 44-2; wherein, a card slot 46-1 is opened in the middle of the fixing block 46, the lower part of the spring piece 43 is U-shaped and is used to be inserted into the card slot 46-1, and the top of the spring piece 43 is a plane and is used to support the cross beam 42. In this way, by setting the deformable spring piece 43, the cross beam 42 and the encapsulation component are pressed in the second card slot 44-2; the encapsulation component can be set to be rectangular. In this solution, the four sides of the rectangular encapsulation component are limited by the frame component 40, the lower part of the rectangular encapsulation component abuts against the cross beam 42, and the upper part of the rectangular encapsulation component is pressed against the top surface of the second card slot 44-2 by the spring piece 43, and the positioning effect on the encapsulation component is good.

[0068] In some embodiments, referring to Figure 4The short frame 45 includes a third card slot 45-1, the opening direction of the third card slot 45-1 is toward the middle of the frame assembly 40, and the third card slot 45-1 is used to accommodate one side of the L-shaped connecting corner piece 41; wherein, the other side of the L-shaped connecting corner piece 41 extends into the first card slot 44-1. In this way, the third card slot 45-1 is provided on the short frame 45, which has the effect of reducing weight and is convenient for placing the connecting corner piece 41, and has high space utilization; the two ends of the connecting corner piece 41 are respectively placed in the third card slot 45-1 and the first card slot 44-1, so as to prevent the connecting corner piece 41 from protruding out of the frame assembly 40 and thus affecting the placement space of the packaging assembly.

[0069] Based on the above embodiments, see Figure 4 The short frame 45 is a thin-walled structure, which has a good weight reduction effect.

[0070] In some embodiments, see Figure 6 The top surface of the second card slot 44-2 is connected to at least one deformable pressure strip 44-3, the end of the pressure strip 44-3 is inclined toward the middle of the second card slot 44-2, and the end of the top surface of the second card slot 44-2 is also inclined toward the middle of the second card slot 44-2; the lower part of the first card slot 44-1 and the fixed block 46 is provided with a matching V-shaped card connection structure. In this way, a pressure strip 44-3 is provided to press the top surface of the packaging component, thereby reducing the shaking of the packaging component after the position is fixed, and the pressure strip 44-3 is tilted toward the middle of the second card slot 44-2 to ensure that the pressure strip 44-3 is in contact with the top surface of the packaging component; the end of the top surface of the second card slot 44-2 is also tilted toward the middle of the second card slot 44-2 to ensure that the end of the top surface of the second card slot 44-2 presses the packaging component and improves the stability of the packaging component; a V-shaped clamping structure is provided to clamp and fix the first card slot 44-1 and the fixing block 46 to reduce the shaking after the fixing block 46 is placed in the first card slot 44-1.

[0071] For details, see Figure 5 The first clamping groove 44 - 1 and the lower part of the connecting angle piece 41 are provided with matching V-shaped clamping structures.

[0072] Based on the above embodiments, see Figure 6 The top surface of the second card slot 44-2 is in an outwardly convex arc shape, and the pressure strip 44-3 is provided with a.

[0073] Specifically, the bypass 20 is fixed on the insulating board. Specifically, the supercapacitor 21 and the first resistor 22 of the bypass 20 are fixed on the insulating board through insulating nuts. The bypass 20 and the insulating board are fixed together in the third card slot 45-1 of the short frame 45. The battery cell 12 of the main circuit 10 is pressed by the packaging component and placed in the middle of the frame component 40. The packaging component extends into the second card slot 44-2 and is clamped. The connecting wire of the main circuit 10 extends from the edge of the packaging component and the outer periphery of the connecting wire is surrounded by an insulating jacket. The connecting wire is connected to the bypass 20.

[0074] Specifically, the frame component 40 is provided with a heat storage material on the rack. The heat storage material can adjust and stabilize the extreme working temperature of the component.

[0075] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention schematically. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0076] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0077] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it cannot be understood as a limitation to the present invention.

[0078] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0081] In the description of this specification, the descriptions with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0082] The above-described embodiments merely represent several implementation manners of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A connection circuit of a photovoltaic cell, characterized in that, Comprising: A main path (10), the main path (10) includes a diode (11) and a plurality of serially connected solar cells (12), and the diode (11) is connected in parallel with the solar cells (12); A bypass path (20), the bypass path (20) includes at least one supercapacitor (21) connected in series, and each supercapacitor (21) is connected in parallel with a first resistor (22); Wherein, the main path (10) and the bypass path (20) are connected in parallel.

2. The connection line of the photovoltaic cell according to claim 1, characterized in that, The bypass path (20) further includes: A thermistor (23), the thermistor (23) is connected in series with the supercapacitor (21).

3. The connection circuit of the photovoltaic cell according to claim 1, characterized in that The plurality of serially connected solar cells (12) are divided into at least one group, and each group of solar cells (12) is connected in parallel with one of the diodes (11).

4. A photovoltaic module, characterized in that, Including the photovoltaic cell connection circuit according to any one of claims 1-3, further comprising: A packaging component for fixing and packaging the main path (10); A frame component (40) for fixing the bypass path (20), and the frame component (40) surrounds the outer periphery of the packaging component.

5. The photovoltaic module according to claim 4, characterized in that, The frame component (40) has a rectangular structure, and the frame component (40) includes: Long side frames (44) and short side frames (45), Connecting corner pieces (41) for connecting adjacent long side frames (44) and short side frames (45), and the connecting corner pieces (41) are L-shaped; Cross beams (42) for supporting the packaging component, and two ends of the cross beams (42) are respectively connected to two long side frames (44) arranged in parallel; Fixing blocks (46) for supporting the cross beams (42) and being snap-connected to the long side frames (44).

6. The photovoltaic module according to claim 5, characterized in that, The cross beams (42) are filled with heat storage materials.

7. The photovoltaic module according to claim 5, characterized in that, The long side frames (44) include: A first card slot (44-1) opened along its length direction for snap-connecting the fixing block (46); A second card slot (44-2) opened along its length direction for snap-connecting the packaging component; Wherein, the first card slot (44-1) is located below the second card slot (44-2), and both the first card slot (44-1) and the second card slot (44-2) are C-shaped slots with one-sided openings, and the opening directions both face the middle of the frame component (40).

8. The photovoltaic module according to claim 7, characterized in that, The frame component (40) further includes: Elastic pieces (43) for supporting the lower part of the cross beams (42) and pressing the packaging component into the second card slot (44-2); Wherein, a card slot (46-1) is opened in the middle of the fixing block (46), the lower part of the elastic piece (43) is U-shaped and is used for being snapped into the card slot (46-1), and the top of the elastic piece (43) is flat and is used for supporting the cross beams (42).

9. The photovoltaic module according to claim 7, wherein, The short side frames (45) include: A third card slot (45-1), the opening direction of the third card slot (45-1) faces the middle of the frame component (40), and the third card slot (45-1) is used for accommodating one side of the L-shaped connecting corner piece (41); Wherein, the other L-shaped side of the connecting corner piece (41) extends into the first card slot (44-1).

10. The photovoltaic module according to claim 7, wherein, At least one deformable pressing strip (44-3) is connected to the top surface of the second card slot (44-2). The end of the pressing strip (44-3) is inclined towards the middle of the second card slot (44-2), and the end of the top surface of the second card slot (44-2) is also inclined towards the middle of the second card slot (44-2); a matching V-shaped clamping structure is provided at the lower parts of the first card slot (44-1) and the fixing block (46).

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