CN210123964U - Junction box and photovoltaic panel assembly with same - Google Patents
Junction box and photovoltaic panel assembly with same Download PDFInfo
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- CN210123964U CN210123964U CN201921478437.0U CN201921478437U CN210123964U CN 210123964 U CN210123964 U CN 210123964U CN 201921478437 U CN201921478437 U CN 201921478437U CN 210123964 U CN210123964 U CN 210123964U
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Abstract
The utility model discloses a junction box, which is applied to a photovoltaic module, the photovoltaic module is provided with a first battery string and a second battery string which are arranged in series, the first end of the first battery string is connected with the first end of the second battery string, the junction box comprises a shunt resistor, a first resistor and a second resistor, and the shunt resistor, the first resistor and the second resistor are connected in series in sequence; a connecting interface is arranged between the shunt resistor and the first resistor and is used for connecting the connecting points of the first battery string and the second battery string; the other end of the shunt resistor is provided with a first interface used for connecting the second end of the first battery string, and the other end of the second resistor is provided with a second interface used for connecting the second end of the second battery string; and two ends of the shunt resistor and two ends of the second resistor are respectively provided with an output port which is convenient for measuring or outputting voltage. The interface on the terminal box can cooperate the original interface that is used for connecting the triode on the photovoltaic board subassembly, need not to reform transform. The application also discloses a photovoltaic panel assembly including the junction box.
Description
Technical Field
The utility model relates to a photovoltaic equipment technical field, more specifically say, relate to a terminal box. Furthermore, the utility model discloses still relate to a photovoltaic board subassembly including above-mentioned terminal box.
Background
At present, the loading amount of large photovoltaic power stations is continuously increased, and how to evaluate the performance of the large photovoltaic power stations is an important subject in the industry.
Currently, irradiation testers and temperature sensors are commonly used in the market for monitoring, but they are expensive and have some systematic errors. For example, conventional radiation testers are based on thermopile sensors, and have a large spectral response difference from photovoltaic modules; the circular structure of the conventional irradiation tester makes the incident angle response of the conventional irradiation tester different from that of the photovoltaic module; the temperature sensor is attached to the back of the assembly and is easy to fall off after long-term operation.
In summary, how to obtain the performance of the photovoltaic panel assembly is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a terminal box, the voltage value that battery cluster corresponds in the photovoltaic board subassembly can conveniently be acquireed in the use of this terminal box to carry out the acquireing of photovoltaic board subassembly performance.
Another object of the utility model is to provide a photovoltaic board subassembly including above-mentioned terminal box.
In order to achieve the above object, the present invention provides the following technical solutions:
a junction box is applied to a photovoltaic assembly, the photovoltaic assembly is provided with a first battery string and a second battery string which are arranged in series, the first end of the first battery string is connected with the first end of the second battery string, the junction box comprises a shunt resistor, a first resistor and a second resistor, and the shunt resistor, the first resistor and the second resistor are sequentially connected in series;
a connecting interface is arranged between the shunt resistor and the first resistor and used for connecting the connecting points of the first battery string and the second battery string;
the other end of the shunt resistor is provided with a first interface used for connecting the second end of the first battery string, and the other end of the second resistor is provided with a second interface used for connecting the second end of the second battery string; and the two ends of the shunt resistor and the two ends of the second resistor are respectively provided with an output port convenient for measuring or outputting voltage.
Preferably, two ends of the shunt resistor are provided with first voltage measuring devices which are convenient for measuring and outputting voltages at the two ends of the shunt resistor;
and two ends of the second resistor are provided with second voltage measuring devices which are convenient for measuring and outputting the voltages at the two ends of the second resistor.
Preferably, the battery pack further comprises a control device, the control device is connected with the first voltage measuring device and the second voltage measuring device, and the control device is connected with a memory for storing the shunt resistor, the resistance values of the first resistor and the second resistor, the short-circuit current of the first battery string and the open-circuit voltage of the second battery string.
Preferably, the control device is connected to a display device for displaying the detection results of the first voltage measuring device and the second voltage measuring device.
Preferably, input means for inputting the short-circuit current of the first battery string and the open-circuit voltage of the second battery string is connected to the control means.
Preferably, the control device is connected to a detection device for detecting a short-circuit current of the first battery string and an open-circuit voltage of the second battery string.
Preferably, the control device comprises a battery temperature acquisition module and an irradiation intensity acquisition module;
the battery temperature acquisition module is connected with the second voltage measurement device and the memory and used for acquiring the measurement result of the second voltage measurement device, the first resistor, the resistance value of the second resistor and the open-circuit voltage of the second battery string so as to acquire the battery temperature;
the irradiation intensity acquisition module is connected with the battery temperature acquisition module and the first voltage measurement device and used for acquiring the battery temperature, the resistance value of the shunt resistor, the measurement result of the first voltage measurement device, the short-circuit current of the first battery string, the open-circuit voltage temperature coefficient and the short-circuit current temperature coefficient so as to acquire the irradiation intensity.
A photovoltaic panel assembly comprising a photovoltaic module having a first cell string and a second cell string connected in series, a first end of the first cell string and a first end of the second cell string being connected, and a junction box as in any of the above;
the connection interface is connected with the connection point of the first battery string and the second battery string;
the first interface is connected with the second end of the first battery string, and the second interface is connected with the second end of the second battery string.
Preferably, the shunt resistance satisfies the formula:
wherein R isshuntIs the resistance value of the shunt resistor, VOC.stringAIs the open circuit voltage of the first cell string, ISC.stringAIs a short circuit current of the first battery string;
and/or the first resistance and the second resistance satisfy the formula:
wherein R is1+R2Is the sum of the resistances of the first and second resistors, VOC.stringBIs the open circuit voltage of the second cell string, ISC.stringBIs a short circuit current of the second battery string.
The utility model provides a terminal box has the shunt resistance with first battery cluster parallel and with first resistance and the second resistance of second battery cluster parallel, first resistance and second resistance series connection all have so that measure or output voltage's output port at the both ends of shunt resistance and second resistance. The operator can measure the voltage value of the shunt resistor, the voltage value of the second resistor or the voltage value of the first resistor through the junction box. The battery strings of the photovoltaic panel assembly are respectively connected with different resistors in parallel, the resistors replace diode structures in the existing common junction box, and the current voltage values of the two battery strings can be obtained by obtaining the terminal voltages of the resistors, so that the calculation of the battery temperature and the irradiation intensity can be realized.
Compared with the mode of measuring through specific sensor among the prior art, can obtain the voltage that corresponds the battery cluster through the terminal box in this application, thereby make things convenient for the operator to calculate through the open circuit voltage and the short-circuit current of known battery cluster and the resistance of each resistance and obtain battery temperature and irradiation intensity, the interface on the terminal box can cooperate the original interface that is used for connecting the triode on the photovoltaic panel subassembly, need not reform transform photovoltaic panel subassembly, the terminal box that this application provided provides convenient prerequisite and basis for operating personnel obtains battery temperature and irradiation intensity.
The application also discloses a photovoltaic panel assembly including the junction box.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a circuit connection diagram of a junction box and a photovoltaic panel assembly provided by the present invention.
In fig. 1:
1 is a junction box, 11 is a connection interface, 12 is a first interface, 13 is a second interface, 14 is a first voltage measuring device, and 15 is a second voltage measuring device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a terminal box, the voltage value that the battery cluster corresponds in the photovoltaic board subassembly can conveniently be acquireed in the use of this terminal box to carry out the acquirement of photovoltaic board subassembly performance. Another core of the utility model is to provide a photovoltaic board subassembly including above-mentioned terminal box.
Referring to fig. 1, fig. 1 is a circuit connection diagram of a junction box and a photovoltaic panel assembly provided in the present invention. In the drawings of the present application, a is a first battery string, B is a second battery string, RshuntIs a shunt resistance, R1Is a first resistance, R2Is a second resistor.
The utility model provides a terminal box mainly is applied to the acquisition in-process of photovoltaic module's performance, carries out vertical measurement and acquirees, and photovoltaic module is different from conventional subassembly, and the function of the photovoltaic module of this application design lies in monitoring effective irradiation in inclined plane and subassembly temperature.
The targeted photovoltaic module is generally required to have a first cell string and a second cell string arranged in series, and a first end of the first cell string and a first end of the second cell string are connected. The junction box comprises a shunt resistor RshuntA first resistor R1And a second resistor R2Shunt resistance RshuntA first resistor R1And a second resistor R2Are sequentially connected in series;
shunt resistor RshuntAnd a first resistor R1A connection interface 11 is arranged between the first battery string A and the second battery string B and is used for connecting the connection points of the first battery string A and the second battery string B;
shunt resistor RshuntIs provided with a first interface 12 for connecting the second end of the first battery string a, a second resistor R2The other end of the first battery string B is provided with a second interface 13 for connecting the second end of the second battery string B; shunt resistor RshuntAnd a second resistor R2Respectively, have output ports for measuring or outputting voltages.
The junction box of the present invention may have only a circuit structure having the resistor and the connection interface, or may have a housing structure outside thereof, and each interface is exposed to the surface of the housing structure, thereby facilitating the operation.
Shunt resistor RshuntA first resistor R1And a second resistor R2Connected in series in sequence, shunt resistor RshuntHas one end provided with a first interface 12 and a second resistor R2Has a second interface 13 at one end, is connected to the shunt resistor and the first resistor R1The connection line is provided with a connection interface 11, and the first interface 12, the second interface 13 and the connection interface 11 can be all of common welding spot structures or interfaces with connection line slots for connecting connection positions of the first battery string and the second battery string.
When the junction box 1 is connected with the photovoltaic module, the first interface 12 is connected with the second end of the first battery string a, the second interface 13 is connected with the second end of the second battery string B, and meanwhile, the connection interface 11 is connected with the connection point of the first battery string a and the second battery string B. Therefore, the shunt resistance R can be formedshuntConnected in parallel to the first battery string A and the first resistor R1And a second resistor R2Is connected in parallel to the second battery string B.
The shunt resistor R isshuntOne end of (1), a shunt resistor and a first resistor R1First resistor R1And a second resistor R2A second resistor R2The first end of the first solder joint, the second solder joint, the third solder joint and the fourth solder joint, or the interfaces with corresponding names, and a voltage measuring device can be arranged between any two solder joints or interfaces to measure the voltage value, or the output interface of the voltage value is used to directly obtain the voltage value.
The resistor in the junction box can be connected with the battery strings of the photovoltaic panel assembly in parallel respectively, the resistor replaces a diode structure in the existing common junction box, the current voltage values of the two battery strings can be obtained by obtaining the terminal voltage of the resistor, and therefore the current voltage values can be used for calculating the temperature and the irradiation intensity of the battery.
Compared with the mode of measuring through specific sensor among the prior art, this application can obtain the voltage that corresponds the battery cluster through the terminal box, thereby make things convenient for the operator to calculate through the open circuit voltage and the short-circuit current of known battery cluster and the resistance of each resistance and obtain battery temperature and irradiation intensity, the interface on the terminal box can cooperate the original interface that is used for connecting the triode on the photovoltaic panel subassembly, need not reform transform photovoltaic panel subassembly, the terminal box that this application provided provides convenient operation mode for operating personnel obtains battery temperature and irradiation intensity.
The output port convenient for measurement or voltage output can be used for measuring electric points, a user can conveniently measure through instruments such as a universal meter, and a measuring device can be directly arranged on the structure. On the basis of the above embodiment, the two ends of the shunt resistor are provided with the first voltage measuring device 14 which is convenient for measuring and outputting the voltage at the two ends; the second resistor is provided at both ends thereof with second voltage measuring means 15 for measuring and outputting a voltage across the second resistor.
Referring to fig. 1, a first voltage V is measured by the first voltage measuring device 141The second voltage measuring device 15 measures the first voltage V2. Compare in the mode through external measuring equipment, more make things convenient for the in-service use, the debugging that operating personnel need repeated grafting during avoiding actual measurement.
Optionally, the first voltage measuring device 14 and the second voltage measuring device 15 may be multimeters or other electricity measuring devices.
On the basis of the above embodiment, the battery pack further comprises a control device, the control device is connected with the first voltage measuring device 14 and the second voltage measuring device 15, and the control device is connected with a memory for storing the shunt resistor, the resistance values of the first resistor and the second resistor, the short-circuit current of the first battery string and the open-circuit voltage of the second battery string.
The control device may be a central control system or a computer, and the control device is connected to the first and second voltage measuring devices to facilitate introduction of the measurement results into a computing module in the background thereof, and connected to a memory for storing the shunt resistor, the resistances of the first and second resistors, the short-circuit current of the first battery string, and the open-circuit voltage of the second battery string, so as to facilitate retrieval of data, thereby achieving computation of the irradiation intensity and the battery temperature. The control device in the present embodiment is not limited to performing calculation, and may be a storage device for the measurement results of the first and second voltage measurement devices.
On the basis of the above-mentioned embodiment, the control device is connected to the display device for displaying the detection results of the first voltage measuring device 14 and the second voltage measuring device 15.
Optionally, when the control device has a calculation module, the display device may further display the calculated irradiation intensity and the battery temperature.
In practical use, an operator connects the junction box to the photovoltaic module, and in order to facilitate detection, the short-circuit current of the first battery string and the open-circuit voltage of the second battery string need to be known, and when the photovoltaic module is specific to a certain type of specific photovoltaic module, the data can be a fixed value or obtained through manual input by an operator.
The operation of the above-mentioned input device is complicated and when the operator does not know the value, additional measurements need to be taken. Therefore, in an embodiment of the present application, the battery pack further includes a detection device, and the detection device for detecting the short-circuit current of the first battery string and the open-circuit voltage of the second battery string is connected to the control device.
In the existing electrical testing equipment, such as a multimeter, which has a structure capable of measuring open-circuit voltage and short-circuit current, after the junction box and the assembly are assembled, the assembly is sufficiently illuminated (>200kWh) to ensure that the attenuation is stable, and then the open-circuit voltage and the short-circuit current are tested in a laboratory environment.
In addition to any of the above embodiments, the shunt resistor R may be used to expand the applicability of the junction boxshuntA first resistor R1And/or a second resistance R2Is provided as a variable resistor. Because for different photovoltaic modules, the electricity is usedThe resistance value of the resistor needs to be adjusted to a certain degree so as to avoid the problems of inaccurate measurement, safety range exceeding and the like.
On the basis of any one of the above embodiments, the control device includes a battery temperature acquisition module and an irradiation intensity acquisition module;
the battery temperature acquisition module is connected with the second voltage measurement device 15 and acquires the measurement result to acquire the battery temperature T according to the measurement resultc；
The irradiation intensity acquisition module is connected with the battery temperature acquisition module and the first voltage measurement device 14 and is used for acquiring irradiation intensity I through the acquired numerical valuerr。
In this embodiment, a calculator capable of calculating the battery temperature T is providedcAnd intensity of irradiation IrrThe calculation is realized by a calculator.
Specifically, the control device comprises a battery temperature acquisition module and an irradiation intensity acquisition module.
The battery temperature acquisition module is connected to the second voltage measurement device 15 and the memory, and acquires data, including: the second voltage measuring device 15 measures the result, the first resistance, the second resistance value, and the open circuit voltage of the second battery string, and according to the formula:
obtaining the temperature T of the batteryc；
The irradiation intensity acquisition module is connected with the battery temperature acquisition module and the first voltage measurement device 14, and is used for acquiring data, and the irradiation intensity acquisition module comprises: temperature T of batterycThe resistance of the shunt resistor, the measurement result of the first voltage measuring device 14, the short-circuit current of the first battery string, α being the open-circuit voltage temperature coefficient, β being the short-circuit current temperature coefficient, and are used according to the formula:
obtaining the irradiation intensity Irr。
In addition, the above V1Is a measurement result of the first voltage measuring device 14, V2The measurement results of the second voltage measuring device 15 are obtained by measurement.
RshuntIs the resistance value of shunt resistor, R1+R2The sum of the resistance values of the first resistor and the second resistor can be obtained through a memory;
ISC.stringA.STCis the short-circuit current of the first battery string, i.e. the short-circuit current under STC condition, VOC.stringB.STCIs the open circuit voltage of the second cell string, i.e., the open circuit voltage under STC conditions; may be obtained by measurement or by input.
α and β are both open circuit voltage temperature coefficients and short circuit current temperature coefficients, which can be obtained by pre-storing the inputs.
It should be noted that the above formula is obtained through ohm's law, the influence relationship between the photovoltaic module temperature and the open-circuit voltage, and the influence relationship between the photovoltaic module temperature and the short-circuit current, and specifically, the obtaining method of the open-circuit voltage temperature coefficient and the obtaining method of the short-circuit current temperature coefficient may be referred to, and may also be obtained through other formulas or obtaining methods.
In addition to the structure and connection of the junction box provided in the above embodiments, the present invention also provides a photovoltaic panel assembly including the above junction box.
A photovoltaic panel assembly comprises a photovoltaic module, the photovoltaic module is provided with a first battery string and a second battery string which are connected in series, the first end of the first battery string is connected with the first end of the second battery string, and the photovoltaic panel assembly also comprises the junction box 1.
The connection interface 11 is connected with the connection point of the first battery string and the second battery string;
the first interface 12 is connected to the second end of the first battery string, and the second interface 13 is connected to the second end of the second battery string.
It should be noted that, the junction box 1 provided in this embodiment and the photovoltaic module may be fixedly connected or detachably connected, and in the prior art, a diode parallel battery string is mainly used to prevent a hot spot effect, so that the junction box 1 may be integrally detached to be replaced in a non-measurement and non-debugging state.
Optionally, considering the requirements of safety and accuracy of photovoltaic module design, according to IEC 60904-2 standard, the shunt resistance is required to satisfy the formula:
wherein R isshuntIs the resistance value of the shunt resistor, VOC.stringAIs the open circuit voltage of the first cell string, ISC.stringAThe short-circuit current of the first battery string is the value of the short-circuit current in the STC state;
and/or the first resistance and the second resistance satisfy the formula:
wherein R is1+R2Is the sum of the resistances of the first resistor and the second resistor, VOC.stringBIs the open circuit voltage of the second cell string, ISC.stringBAnd the short-circuit current of the second battery string is the value of the short-circuit current in the STC state.
In this embodiment, only R is limited1+R2The value range of (2) can be adjusted according to the distribution of the resistance values of the first resistor and the second resistor in actual use requirements.
On the basis of the above embodiment, the resistances of the first resistor and the second resistor may specifically satisfy the following restrictions:
wherein VthresholdWhich is the maximum input voltage of the voltage harvester (i.e. the illustrated second voltage measuring device 15), is typically less than 5V.
Please refer to the prior art for the structure of other parts of the photovoltaic panel assembly, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It is right above the utility model provides a terminal box and photovoltaic board subassembly have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (9)
1. A junction box is applied to a photovoltaic assembly, the photovoltaic assembly is provided with a first battery string and a second battery string which are connected in series, and the first end of the first battery string is connected with the first end of the second battery string;
a connecting interface (11) is arranged between the shunt resistor and the first resistor and is used for connecting the connecting points of the first battery string and the second battery string;
the other end of the shunt resistor is provided with a first interface (12) used for connecting the second end of the first battery string, and the other end of the second resistor is provided with a second interface (13) used for connecting the second end of the second battery string; and the two ends of the shunt resistor and the two ends of the second resistor are respectively provided with an output port convenient for measuring or outputting voltage.
2. The junction box according to claim 1, wherein both ends of the shunt resistor are provided with first voltage measuring means (14) for facilitating measurement and output of a voltage across them;
and a second voltage measuring device (15) which is convenient for measuring and outputting the voltage at the two ends of the second resistor is arranged at the two ends of the second resistor.
3. Junction box according to claim 2, further comprising a control device connected to said first voltage measuring device (14) and said second voltage measuring device (15), said control device being connected to a memory storing said shunt resistor, the resistance values of the first and second resistors, the short circuit current of the first battery string, the open circuit voltage of the second battery string.
4. The terminal box according to claim 3, characterized in that the control device is connected with a display device for displaying the detection results of the first voltage measuring device (14) and the second voltage measuring device (15).
5. The junction box according to claim 3, wherein input means for inputting a short-circuit current of the first battery string and an open-circuit voltage of the second battery string are connected to the control means.
6. The junction box according to claim 3, wherein a detection device for detecting a short-circuit current of the first battery string and an open-circuit voltage of the second battery string is connected to the control device.
7. The junction box according to claim 3, wherein the control device includes a battery temperature acquisition module and an irradiation intensity acquisition module;
the battery temperature acquisition module is connected with the second voltage measurement device (15) and the memory and used for acquiring the measurement result of the second voltage measurement device (15), the resistance value of the first resistor, the resistance value of the second resistor and the open-circuit voltage of the second battery string so as to acquire the battery temperature;
the irradiation intensity acquisition module is connected with the battery temperature acquisition module and the first voltage measurement device (14) and used for acquiring the battery temperature, the resistance value of the shunt resistor, the measurement result of the first voltage measurement device (14), the short-circuit current of the first battery string, the open-circuit voltage temperature coefficient and the short-circuit current temperature coefficient so as to acquire the irradiation intensity.
8. A photovoltaic panel assembly comprising a photovoltaic module having a first string of cells and a second string of cells connected in series, a first end of the first string of cells and a first end of the second string of cells being connected, further comprising the junction box of any of claims 1 to 7;
the connection interface is connected with the connection point of the first battery string and the second battery string;
the first interface is connected with the second end of the first battery string, and the second interface is connected with the second end of the second battery string.
9. The photovoltaic panel assembly of claim 8, wherein the shunt resistance satisfies the formula:
wherein R isshuntIs the resistance value of the shunt resistor, VOC.stringAIs the open circuit voltage of the first cell string, ISC.stringAIs a short circuit current of the first battery string;
and/or the first resistance and the second resistance satisfy the formula:
wherein R is1+R2Is the sum of the resistances of the first and second resistors, VOC.stringBIs the open circuit voltage of the second cell string, ISC.stringBIs a short circuit current of the second battery string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921478437.0U CN210123964U (en) | 2019-09-05 | 2019-09-05 | Junction box and photovoltaic panel assembly with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921478437.0U CN210123964U (en) | 2019-09-05 | 2019-09-05 | Junction box and photovoltaic panel assembly with same |
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| CN210123964U true CN210123964U (en) | 2020-03-03 |
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