CN113098388A - Photovoltaic module, junction box for photovoltaic module and power station abnormity determination method - Google Patents
Photovoltaic module, junction box for photovoltaic module and power station abnormity determination method Download PDFInfo
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- CN113098388A CN113098388A CN201911337560.5A CN201911337560A CN113098388A CN 113098388 A CN113098388 A CN 113098388A CN 201911337560 A CN201911337560 A CN 201911337560A CN 113098388 A CN113098388 A CN 113098388A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a photovoltaic module, a junction box for the photovoltaic module and a power station abnormity judgment method, wherein the junction box comprises: the top of the box body is open; the cover body is arranged at the top of the box body, and an accommodating cavity is defined between the cover body and the box body; the plurality of diodes are arranged in the accommodating cavity; and the current display devices are all arranged in the accommodating cavity, and each current display device is connected in series on a corresponding branch of the diode. According to the junction box for the photovoltaic module, the current display devices are arranged in the accommodating cavity, and each current display device is connected in series on the corresponding branch of the diode, so that the current value in the photovoltaic module is displayed in real time, the problem is conveniently checked in time, and the photovoltaic module is prevented from being damaged by hot spot effect.
Description
Technical Field
The invention relates to the technical field of photovoltaic, in particular to a photovoltaic module, a junction box for the photovoltaic module and a power station abnormity judgment method.
Background
In the related technology, in the actual operation process of a power station, the problem that the battery piece of the photovoltaic module is possibly shaded by shadows, foreign matters and the like exists, so that the battery piece can be subjected to attenuation mismatch to cause forward conduction of a diode in a junction box of the photovoltaic module, forward current passes through the diode, and the shaded battery piece or the hidden cracked battery piece becomes a load to consume the power of other battery pieces. Moreover, when the shielded cell or the hidden-cracked cell consumes power, the temperature of the cell is increased along with the heating phenomenon, and as the power of the photovoltaic module is higher and higher, the hot spot temperature of the photovoltaic module is also higher and higher, so that the hot spot risk is higher and higher, and the photovoltaic module is further damaged. However, when the battery piece generates slight hot spots or the temperature difference of the power station test is small (at the moment, the hot spots are just generated), the problem that the battery piece is shielded or hidden cracks is not easy to be found by operation and maintenance personnel.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one object of the present invention is to provide a junction box for a photovoltaic module, which ensures real-time display of a current value in the photovoltaic module, facilitates timely troubleshooting, and avoids damage to the photovoltaic module due to hot spot effect.
Another object of the present invention is to provide a photovoltaic module having the junction box.
The invention further aims to provide a power station abnormity judgment method with the photovoltaic module.
The junction box for a photovoltaic module according to an embodiment of the first aspect of the present invention includes: the top of the box body is open; the cover body is arranged at the top of the box body, and an accommodating cavity is defined between the cover body and the box body; the plurality of diodes are arranged in the accommodating cavity; and the current display devices are all arranged in the accommodating cavity, and each current display device is connected in series on a corresponding branch of the diode.
According to the junction box for the photovoltaic module, the current display devices are arranged in the accommodating cavity, and each current display device is connected in series on the corresponding branch of the diode, so that the current value in the photovoltaic module is displayed in real time, problems are conveniently checked in time, and the photovoltaic module is prevented from being damaged by hot spot effect.
According to some embodiments of the invention, the current display device comprises a display screen, and a portion of the cover body corresponding to the display screen is a transparent member.
According to some embodiments of the invention, the cover is a transparent piece.
According to some embodiments of the invention, the accommodating cavity is filled with a pouring sealant, and the pouring sealant is transparent adhesive.
According to some embodiments of the invention, the cartridge is a transparent cartridge or a black cartridge.
According to a second aspect of the invention, a photovoltaic module comprises: the battery pack comprises a plurality of battery cell groups, a plurality of battery cell groups and a plurality of battery cells, wherein the plurality of battery cell groups are connected in series, each battery cell group comprises two battery strings, the two battery strings are connected in series, and each battery string comprises a plurality of battery sheets which are connected in series; the junction box is arranged on the back of the plurality of cell units, each diode of the junction box and the corresponding current display device are connected in parallel between the two cell strings of the corresponding cell unit, and the junction box is used for a photovoltaic module according to the embodiment of the first aspect of the invention.
According to an abnormality determination method for a power station of an embodiment of a third aspect of the present invention, the power station includes a photovoltaic module including a plurality of cell groups, the plurality of cell groups being connected in series, each of the cell groups including two cell strings, the two cell strings being connected in series, each of the cell strings including a plurality of battery cells connected in series, a diode being connected in parallel between the two cell strings of the cell group, the determination method including the steps of: under the conditions that the irradiance is stable and the radiation illumination reaches a preset threshold value, judging whether the branch of the diode has current passing through; under the condition that the branch of the diode passes through current, detecting the change trend of the current of the branch of the diode along with the change trend of the shielding area for shielding one of a plurality of battery pieces which are connected with the diode in parallel so as to judge whether the photovoltaic module is abnormal; and under the condition that no current passes through the branch of the diode, detecting the change trend of the current of the branch of the diode along with the shielding area so as to judge whether the photovoltaic module is abnormal.
According to some embodiments of the present invention, in a case where the branch of the diode has a current passing therethrough, when the current of the branch of the diode is Imp and does not vary with a variation of the shielding area, it is determined that a bus bar lead line of the battery string is cold-soldered or the battery string is disconnected; when the initial current value of the branch of the diode is negative, and the current of the branch of the diode gradually increases along with the increase of the shielding area and is changed from negative to positive, determining that the diode is short-circuited; and when the current of the branch of the diode is gradually increased and the current value is always positive along with the increase of the shielding area, judging that the battery string connected with the diode in parallel has shielding or hidden crack.
According to some embodiments of the present invention, when there is no current flowing through the branch of the diode, the current of the branch of the diode is always zero and does not change with the change of the shielding area, and the branch of the diode is determined to be an open circuit; and the initial current value of the branch of the diode is zero, the current of the branch of the diode is increased along with the increase of the shielding area, and the diode is judged to normally protect two battery strings connected with the diode in parallel.
According to some embodiments of the invention, the predetermined threshold is 600W per square meter.
According to some embodiments of the present invention, the photovoltaic module is the photovoltaic module according to the embodiment of the second aspect of the present invention, and whether a current passes through the branch and a trend of the current changing with the shielding area are determined by looking at the current display device of the branch of the diode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a junction box for a photovoltaic module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention with one of the diode branches open;
FIG. 3 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention with current in one of the diode branches;
FIG. 4 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention when one of the diode legs has current and the diode is shorted;
FIG. 5 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention when one of the diode branches has current and the string of cells connected in parallel with the diode has shading or subfissure;
fig. 6 is a flowchart illustrating a power station abnormality determination method according to an embodiment of the present invention.
Reference numerals:
100: a photovoltaic module;
1: a junction box; 11: a box body; 12: a diode; 13: a current display device; 14: a binding post;
2: a battery cell stack; 21: a battery string; 211: a battery piece.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A junction box 1 for a photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 6.
As shown in fig. 1, a junction box 1 for a photovoltaic module 100 according to an embodiment of the first aspect of the present invention includes a box body 11, a cover body (not shown), a plurality of diodes 12, and a plurality of current display devices 13. Here, "a plurality" means two or more.
Specifically, the top of box body 11 is opened, and the lid is established at the top of box body 11, and the chamber that holds is injectd between lid and the box body 11, and a plurality of diodes 12 and a plurality of current display device 13 are all established and are held the intracavity, and every current display device 13 establishes ties on the branch road of the diode 12 that corresponds. For example, in the example of fig. 1, the case 11 may be substantially rectangular, the cover and the case 11 together define a receiving cavity, the plurality of diodes 12 may be disposed in the receiving cavity at intervals, the plurality of diodes 12 are connected in series in the receiving cavity, the plurality of current display devices 13 may be disposed in the receiving cavity at intervals, the current display devices 13 are connected in series in branches where the corresponding diodes 12 are located, and the plurality of current display devices 13 correspond to the plurality of diodes 12 one to one. So set up, can guarantee that current display device 13 can show the current value on the branch road at diode 12 place in real time, when terminal box 1 was applied to photovoltaic module 100, the fortune dimension personnel of being convenient for in time investigated the risk according to above-mentioned current value, avoided hot spot effect to lead to the fact the damage to photovoltaic module 100.
According to the junction box 1 for the photovoltaic module 100, the plurality of current display devices 13 are arranged in the accommodating cavity of the junction box 1, and each current display device 13 is connected in series on the branch of the corresponding diode 12, so that the current value of the branch can be digitally displayed by the current display devices 13, and the purpose of real-time monitoring is achieved. When the junction box 1 is applied to the photovoltaic module 100, the time when the photovoltaic module 100 generates hot spots and the hot spot degree can be accurately reflected through the current value, and operation and maintenance personnel can conveniently overhaul, replace and the like, so that the purposes of reducing the risk of the photovoltaic module 100 and improving the power generation amount and the reliability are achieved.
According to some embodiments of the present invention, the current display device 13 includes a display screen, and a portion of the cover corresponding to the display screen is a transparent member. Therefore, operation and maintenance personnel can clearly read the current value on the display screen through the cover body.
In some alternative embodiments, the cover is a transparent piece. From this, through adopting transparent material preparation with whole lid to be convenient for the whole machine-shaping of lid, can improve machining efficiency, reduce cost. The cover body may be made of transparent PPO (polyphenylene oxide), glass, or organic glass, but is not limited thereto.
According to some embodiments of the present invention, the accommodating cavity of the junction box 1 is filled with a pouring sealant. Because a plurality of diodes 12 in terminal box 1, a plurality of terminal 14 all are electrified bodies, fill the casting glue and can play insulating effect holding the intracavity, guarantee that a plurality of diodes 12, a plurality of terminal 14 do not influence each other, the casting glue can also play sealed and heat conduction's effect simultaneously to the life of terminal box 1 has been improved. The potting adhesive is transparent adhesive, which is convenient for reading the current value on the current display device 13.
In some alternative embodiments, the box 11 is a transparent box or a black box, but is not limited thereto.
Optionally, the current display device 13 is an ammeter. Therefore, the structure is simple and the cost is low. But is not limited thereto.
As shown in fig. 2 to 5, a photovoltaic module 100 according to an embodiment of the second aspect of the present invention includes a plurality of cell stacks 2 and at least one junction box 1.
Specifically, a plurality of battery cell groups 2 are connected in series, each battery cell group 2 includes two battery strings 21, the two battery strings 21 are connected in series, and each battery string 21 includes a plurality of battery tabs 211 connected in series. For example, as shown in fig. 2 to 5, the photovoltaic module 100 includes three cell stacks 2, the three cell stacks 2 are connected in series, each cell stack 2 includes two cell strings 21, and the two cell strings 21 are connected in series, and each cell string 21 includes twelve cell sheets 211 connected in series, but is not limited thereto. It is understood that the number of the battery cell groups 2 and the number of the battery sheets 211 may be set according to actual requirements. The terminal block 1 may be provided at the rear of the plurality of cell stacks 2, and each diode 12 and the corresponding current display device 13 in the terminal block 1 are connected in parallel between two battery strings 21 of the corresponding cell stack 2.
According to the photovoltaic module 100 provided by the embodiment of the invention, the current display device 13 is ensured to display the current value of each battery cell group 2 in real time, so that operation and maintenance personnel can conveniently and timely troubleshoot the abnormal problem of the photovoltaic module 100 according to the current value, and the damage of the hot spot effect to the photovoltaic module 100 can be effectively avoided.
As shown in fig. 6, a power plant abnormality determination method according to an embodiment of the third aspect of the present invention. Wherein, the power station includes photovoltaic module 100, and photovoltaic module 100 includes a plurality of battery cell group 2, a plurality of battery cell group 2 series connection, every battery cell group 2 includes two battery strings 21, two battery strings 21 series connection, and every battery string 21 includes a plurality of battery pieces 211 of series connection, and parallel connection has diode 12 between two battery strings 21 of battery cell group 2.
The power station abnormity judging method comprises the following steps:
under the condition that the irradiance is stable and the irradiance reaches a predetermined threshold,
judging whether the branch of the diode 12 has current passing through;
in case of a current passing through the branch of the diode 12,
detecting the trend of the current of the branch of the diode 12 along with the change of the shielding area shielding one of the plurality of battery slices 211 connected with the diode 12 in parallel so as to judge whether the photovoltaic module 100 is abnormal;
in case no current passes through the branch of the diode 12,
the variation trend of the current of the branch of the diode 12 along with the shielding area is detected to judge whether the photovoltaic module 100 is abnormal.
Further, in case of a current passing through the branch of the diode 12,
when the current of the branch of the diode 12 is Imp and does not change along with the change of the shielding area, judging that the bus bar lead wire of the battery string 21 is in false soldering or the battery string 21 is in open circuit;
when the initial current value of the branch of the diode 12 is negative, and the current of the branch of the diode 12 gradually increases along with the increase of the shielding area and becomes positive from negative, it is determined that the diode 12 is short-circuited;
when the current of the branch of the diode 12 gradually increases and the current value is always positive along with the increase of the shielding area, it is determined that the battery string 21 connected in parallel with the diode 12 has shielding or hidden cracks.
Specifically, for example, referring to fig. 3 in combination with fig. 6, under the condition that the irradiance is stable and is greater than the predetermined threshold, if a current passes through a certain cell stack 2, any one of the battery plates 211 in the cell stack 2 is shielded, and the shielding area of the battery plate 211 is gradually increased, for example, the shielding area may be gradually increased by 10%, 20%, 30%, 40%, and 50%. If the current value of the branch of the diode 12 of the cell group 2 is always Imp and does not change with the change in the shielded area of the cell string 21, it is possible to determine that the bus bar lead wire of the cell group 2 is in a cold joint, or that the cell string 21 of the cell group 2 is broken. At this time, the problem of the open circuit of the battery string 21 of the battery cell group 2 can be solved by re-welding the bus bar lead wires and performing the cold welding and glue filling on the bus bar lead wires of the battery cell group 2, or replacing the photovoltaic module 100.
Referring to fig. 4 in combination with fig. 6, if a current flows through a certain cell stack 2 and the initial value of the current display device 13 of the cell stack 2 is negative under the condition that the irradiance is stable and greater than the predetermined threshold, the shading area of any one of the battery slices 211 in the cell stack 2 is gradually increased, for example, the shading area may be gradually increased by 10%, 20%, 30%, 40%, and 50%. As the shielding area of the battery sheet 211 increases, the short-circuit current Isc1 of the battery cell group 2 gradually decreases, the current I of the branch of the diode 12 of the battery cell group 2 gradually increases, the current value of the current display device 13 is Imp-Isc1(Imp is the operating current of the photovoltaic module 100, and Isc1 is the short-circuit current of the battery string of the branch of the diode of the battery cell group 2), and the current value of the current display device 13 changes from a negative value to a positive value (the diode reverse current changes to the forward current), it can be determined that the diode 12 of the battery cell group 2 is short-circuited. This may occur because the diode 12 is broken down, a conductive object, or a conductive foreign object causes a short circuit across the diode 12. When the diode 12 is broken down, and the shielding area of the cell sheet 211 of the cell group 2 is increased so that Isc1 is Imp, the hot spot of the cell group 2 is the most serious, the shielded cell sheet 211 consumes the largest power, and the consumed power is about the sum of the output powers of the other cell sheets. At this time, the problem of the breakdown of the diode 12 or the short circuit at two ends can be solved by replacing the diode 12 or the junction box 1, or filling the potting adhesive in the junction box 1 after removing the conductive foreign matters and the conductive bodies.
Referring to fig. 5 in combination with fig. 6, if a current flows through a certain cell stack 2 under the condition that the irradiance is stable and greater than the predetermined threshold, any one of the battery pieces 211 in the cell stack 2 is shielded, and the shielding area of the battery piece 211 is gradually increased, for example, the shielding area may be gradually increased by 10%, 20%, 30%, 40%, and 50%. As the shielding area of the battery cells 211 of the battery cell group 2 increases, the current value of the battery cell group 2 gradually increases, and the current values are positive values, it can be determined that the diode 12 of the battery cell group 2 still has the function of protecting the battery string 21, and has the performance of forward conduction and reverse cut-off. When a current flows through the cell stack 2, the diodes 12 of the cell stack 2 are in a forward conduction state, which may be caused by a shadow, a foreign object, or a hidden crack in the battery strings 21 of the cell stack 2, thereby causing a cell mismatch. At this time, the problem of shadow or foreign matter blocking of the battery string 21 of the battery cell group 2 can be solved by removing the foreign matter, or the problem of hidden crack and mismatch of the battery pieces 211 can be solved by replacing the photovoltaic module 100.
Further, when no current flows through the branch of the diode 12,
the current of the branch of the diode 12 is always zero and does not change along with the change of the shielding area, and the branch of the diode 12 is judged to be an open circuit;
the initial current value of the branch of the diode 12 is zero, and the current of the branch of the diode 12 increases with the increase of the shielding area, so that it is determined that the diode 12 normally protects the two battery strings 21 connected in parallel with the diode 12.
Specifically, for example, referring to fig. 2 in combination with fig. 6, when the radiation illuminance is stable and is greater than the predetermined threshold value, one of the cells 211 is shielded, and the shielding area of the cell 211 is gradually increased, for example, the shielding area may be gradually increased by 10%, 20%, 30%, 40%, or 50%. If no current passes through the battery cell group 2 in which the battery piece 211 is located, the current does not change with the change of the shielding area of the battery piece 211, and the current is zero, it can be determined that the battery cell group 2 in which the battery piece 211 is located is in an open circuit state, the cause of this situation may be insufficient soldering of the terminal 14 of the diode 12, or burning of the diode 12, and the diode 12 no longer plays a role in hot spot protection. At this time, the disconnection problem of the cell group 2 can be solved by replacing the junction box 1 or replacing the photovoltaic module 100.
The above determination method can perform sampling test on all the photovoltaic modules 100 in the power station to determine whether the diode 12 is in a normal working state.
In some alternative embodiments, the predetermined threshold is, but is not limited to, 600W per square meter. The current of the photovoltaic module 100 is positively correlated with the light intensity, and the preset threshold value is set to be 600W/square meter, so that the photovoltaic module 100 is ensured to have enough normal working current, and the experimental error is reduced.
According to some embodiments of the present invention, the photovoltaic module 100 is the photovoltaic module 100 according to the second aspect of the present invention, and whether the current passes through the branch or not and the trend of the current along with the change of the shielding area are determined by looking at the current display device 13 of the branch of the diode 12. Therefore, operation and maintenance personnel can be effectively guaranteed to quickly track the abnormal cell group in the photovoltaic module 100, problems are solved in time, the operation risk of the power station is reduced, and the reliability of the power station is improved.
Other constructions and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
Other configurations and operations of electronic devices according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. A junction box for a photovoltaic module, comprising:
the top of the box body is open;
the cover body is arranged at the top of the box body, and an accommodating cavity is defined between the cover body and the box body;
the plurality of diodes are arranged in the accommodating cavity;
and the current display devices are all arranged in the accommodating cavity, and each current display device is connected in series on a corresponding branch of the diode.
2. The junction box for a photovoltaic module according to claim 1, wherein the current display device comprises a display screen, and a portion of the cover corresponding to the display screen is a transparent member.
3. The junction box for a photovoltaic module of claim 2, wherein the cover is a transparent member.
4. The junction box for a photovoltaic module according to claim 1, wherein the accommodating cavity is filled with a pouring sealant, and the pouring sealant is transparent adhesive.
5. The junction box for a photovoltaic module of claim 1, wherein the box is a transparent box or a black box.
6. A photovoltaic module, comprising:
the battery pack comprises a plurality of battery cell groups, a plurality of battery cell groups and a plurality of battery cells, wherein the plurality of battery cell groups are connected in series, each battery cell group comprises two battery strings, the two battery strings are connected in series, and each battery string comprises a plurality of battery sheets which are connected in series;
at least one junction box, the junction box is arranged on the back of a plurality of battery cell groups, each diode of the junction box and the corresponding current display device are connected in parallel between two battery strings of the corresponding battery cell group, and the junction box is the junction box for the photovoltaic module according to any one of claims 1 to 5.
7. A power station abnormality determination method is characterized in that a photovoltaic module is included in a power station, the photovoltaic module includes a plurality of cell groups, the plurality of cell groups are connected in series, each of the cell groups includes two cell strings, the two cell strings are connected in series, each of the cell strings includes a plurality of cell sheets connected in series, a diode is connected in parallel between the two cell strings of the cell groups,
the determination method includes the steps of:
under the condition that the irradiance is stable and the irradiance reaches a predetermined threshold,
judging whether the branch of the diode has current passing through;
under the condition that the branch of the diode passes through current, detecting the change trend of the current of the branch of the diode along with the change trend of the shielding area for shielding one of a plurality of battery pieces which are connected with the diode in parallel so as to judge whether the photovoltaic module is abnormal;
and under the condition that no current passes through the branch of the diode, detecting the change trend of the current of the branch of the diode along with the shielding area so as to judge whether the photovoltaic module is abnormal.
8. The power station abnormality determination method according to claim 7,
in case of a current through said branch of said diode,
when the current of the branch of the diode is Imp and does not change along with the change of the shielding area, judging that the bus bar lead wire of the battery string is in a false soldering state or the battery string is in an open circuit state;
when the initial current value of the branch of the diode is negative, and the current of the branch of the diode gradually increases along with the increase of the shielding area and is changed from negative to positive, determining that the diode is short-circuited;
and when the current of the branch of the diode is gradually increased and the current value is always positive along with the increase of the shielding area, judging that the battery string connected with the diode in parallel has shielding or hidden crack.
9. The power station abnormality determination method according to claim 7,
when no current flows through the branch of the diode,
the current of the branch of the diode is always zero and does not change along with the change of the shielding area, and the branch of the diode is judged to be an open circuit;
and the initial current value of the branch of the diode is zero, the current of the branch of the diode is increased along with the increase of the shielding area, and the diode is judged to normally protect two battery strings connected with the diode in parallel.
10. The power station anomaly determination method according to claim 7, characterized in that said predetermined threshold value is 600W/square meter.
11. The power station abnormality determination method according to any one of claims 7 to 10, characterized in that the photovoltaic module is according to claim 6, and whether or not there is a current passing through the branch of the diode and a trend of the current with the change in the shielding area are determined by looking at the current display device of the branch.
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