Imaging enhancement device and battery piece detection device

Abstract

The embodiment of the utility model provides an imaging enhancement device and a battery piece detection device, and the device comprises a resistor unit which comprises a plurality of resistors which are connected in parallel; the first end of one resistor is electrically connected with the first end of the main grid in the battery piece, and the second end of the resistor and the second end of the main grid are electrically connected with the positive and negative electrodes of the power supply respectively to form a loop; wherein the battery piece comprises a plurality of main grids, and one main grid corresponds to one resistor, so that a plurality of loops are formed. According to the technical scheme provided by the embodiment of the invention, the resistor is connected between the main grids and the power supply, so that the current among a plurality of loops formed by the plurality of main grids and the power supply is more uniform, the brightness of EL imaging is uniform, and the condition that the defect of a dark surface area in an image is difficult to identify or the dark surface area is misjudged as the defect of a battery piece is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cell manufacturing and detection, and in particular to an imaging enhancement device and a cell detection device. Background Art

[0002] The quality of photovoltaic cell modules directly affects the power generation performance of photovoltaic cells. Before photovoltaic cell modules are put into use, they need to be tested to ensure the power generation performance of photovoltaic cell modules.

[0003] Photovoltaic cell modules are assembled from multiple cells. If any cell in a photovoltaic cell module is defective, it will affect the product quality of the photovoltaic cell module, resulting in low power generation efficiency of the entire photovoltaic cell module and unusable. Therefore, before the cells are assembled into photovoltaic cell modules, it is necessary to test the cells one by one.

[0004] The current EL (electroluminescent) detection uses imaging to obtain images of the cell when it is luminous, so as to distinguish various defects based on the images, such as black core, black edge, broken grid, hidden cracks, etc. However, due to these defects or uneven thickness of the main grid in the cell, the EL imaging is uneven, which affects the identification of defects and affects the efficiency and accuracy of detection. Utility Model Content

[0005] The embodiments of the present application provide an imaging enhancement device and a battery cell detection device to solve or alleviate one or more technical problems in the prior art.

[0006] As one aspect of an embodiment of the present application, an imaging enhancement device is provided in the embodiment of the present application, including:

[0007] A resistor unit, the resistor unit includes a plurality of resistors connected in parallel; a first end of a resistor is electrically connected to a first end of a main grid in a battery cell, and a second end of the resistor and a second end of the main grid are electrically connected to a positive and negative electrode of a power source, respectively, to form a loop;

[0008] The battery cell includes multiple main grids, one main grid corresponds to one resistor, forming multiple loops.

[0009] In one embodiment, the resistor is a variable resistor.

[0010] In one embodiment, a current probe is further included; a loop is provided with a current probe to adjust the resistance value of the variable resistor in the loop according to the current measured by the current probe.

[0011] In one embodiment, the resistance of the resistor ranges from 1 to 100 ohms.

[0012] In one embodiment, it further includes a first terminal row, which includes a plurality of terminals; the first end of the resistor is electrically connected to the first end of the main grid through the terminal.

[0013] In one embodiment, the first terminal row and the plurality of resistors are integrated on a terminal board.

[0014] In one embodiment, the terminal plate includes at least three edges;

[0015] At least one row of terminals of the first terminal row is arranged along the first edge;

[0016] The first ends of the plurality of resistors are arranged close to the second edge, and the second ends of the plurality of resistors are arranged close to the third edge.

[0017] As another aspect of the embodiment of the present application, the embodiment of the present application provides a battery cell detection device, including an imaging enhancement device and an imaging device;

[0018] The imaging enhancement device is electrically connected to a plurality of main grids of the cell to form a plurality of loops, each loop comprising a resistor and a main grid connected in series;

[0019] The imaging device is used to photograph the battery cell.

[0020] In one embodiment, it further includes a control mechanism;

[0021] The resistor is a variable resistor, and each loop is also connected in series with a current probe;

[0022] The control mechanism is communicatively connected with the current probe of each loop;

[0023] The control mechanism collects the electrical signal of the current probe and adjusts the resistance value of the variable resistor in the corresponding loop according to the electrical signal so that the current difference between the multiple loops is within a preset range;

[0024] The imaging device photographs the battery cell when the current difference between the multiple loops is within a preset range.

[0025] In one embodiment, the imaging device is an electroluminescent imaging device.

[0026] The embodiment of the present application adopts the above-mentioned technical solution, by connecting a resistor between the main grid and the power supply to make the current between the multiple loops formed by multiple main grids and the power supply more uniform, so that the brightness of the EL imaging is uniform, avoiding the situation where the dark area in the image is difficult to identify defects, or the dark area is misjudged as a defect in the battery cell.

[0027] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0029] Figure 1 A schematic diagram of the circuit principle of an imaging enhancement device according to an embodiment of the present application is shown.

[0030] Figure 2 A schematic diagram of the circuit principle of an imaging enhancement device according to another embodiment of the present application is shown.

[0031] Figure 3 A partial circuit diagram of an imaging enhancement device according to an embodiment of the present application is shown.

[0032] Figure 4 A schematic structural diagram of a terminal board according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0034] Figure 1 A schematic diagram of the circuit principle of an imaging enhancement device according to an embodiment of the present application is shown. Figure 2 A schematic diagram of the circuit principle of an imaging enhancement device according to another embodiment of the present application is shown. Figure 3 A partial circuit diagram of an imaging enhancement device according to an embodiment of the present application is shown. Figure 4 FIG. 2 shows a schematic diagram of the structure of a terminal board according to an embodiment of the present application. Figures 1 to 4 As shown, an imaging enhancement device according to an embodiment of the present application includes: a resistor 210 unit. The resistor 210 unit includes a plurality of resistors 210 connected in parallel; a first end of a resistor 210 is electrically connected to a first end of a main grid 310 in a battery cell 300; a second end of the resistor 210 and a second end of the main grid 310 are electrically connected to the positive and negative electrodes of a power source 100, respectively, to form a loop.

[0035] The cell 300 is a solar cell 300, which can be, for example, a silicon crystal cell 300. When the cell 300 is produced, a main grid 310 and a secondary grid (not shown) are formed on the surface of the cell 300 during the screen printing process. Both the main grid 310 and the secondary grid are electrodes provided to enhance the electric field of the cell 300. The greater the intensity of the electric field, the greater the movement speed and energy between the charges, so the electric field intensity is one of the important factors affecting the performance of the cell 300.

[0036] The main grid 310 is the most important electrode in the solar cell module. It refers to an electrode arranged along the area of ​​the cell 300 and having a width greater than that of the auxiliary grid. The main grid 310 occupies most of the surface area of ​​the cell 300 and mainly plays the role of collecting charges and transporting electrons to the output end of the battery.

[0037] The auxiliary grid is a supplement to the main grid 310. It is usually processed on the back aluminum strip, and some designs are also on the front. The function of the auxiliary grid is to make the electric field distribution of the battery cell 300 more uniform, so that more charges can be gathered near the main grid 310, thereby increasing the electric field strength while avoiding charge loss caused by excessive electric field concentration.

[0038] The power source 100 is loaded on the main grid 310 of the battery cell 300 to generate an electric field; the EL imaging detection device takes a near-infrared image of the battery cell 300 through a high-resolution infrared camera, and the defects of the battery cell 300 can be determined through the image.

[0039] Furthermore, by adding a resistor 210 at one end of the main grid 310, it is equivalent to increasing the resistance value in the loop. By adding the resistor 210, the influence of the resistance change between multiple main grids 310 caused by main grid 310 defects and the like on the image brightness can be reduced.

[0040] In the embodiment of the present application, the battery cell 300 includes a plurality of main grids 310 , and one main grid 310 corresponds to one resistor 210 , forming a plurality of loops.

[0041] The battery cell 300 includes a plurality of main grids 310 . To test the product quality of the battery cell 300 , each main grid 310 needs to be tested to ensure that the electrons in each main grid 310 can be smoothly transported to the output end of the battery.

[0042] By adding a resistor 210 in each loop, the resistance values ​​of the resistors 210 in multiple loops can be the same or different. When the resistance values ​​of the resistors 210 are the same, the resistance value of the resistor 210 needs to be significantly greater than the contact resistance in the loop, so that the currents in the multiple loops will be balanced and the brightness and darkness of the imaging will be close.

[0043] The embodiment of the present application adopts the above-mentioned technical solution, by connecting a resistor 210 between the main grid 310 and the power supply 100, so that the current between the multiple loops formed by multiple main grids 310 and the power supply 100 is more uniform, so that the brightness of the EL imaging is uniform, avoiding the situation where the dark area in the image is difficult to identify defects, or the dark area is misjudged as a defect of the battery cell 300.

[0044] In one embodiment, Figure 2 As shown, the resistor 210 is a variable resistor 210 - 1 .

[0045] In the embodiment of the present application, by setting the resistor 210 as a variable resistor 210-1, the resistor 210 in the loop can be adjusted. When the main grid 310 in the loop is defective, the contact resistance becomes larger, and by reducing the resistance of the variable resistor 210-1, the current of the loop can be balanced with the current of other loops. The light and dark effects of the imaging are close. When the light and dark effects are the same, the position with defects can be more easily distinguished.

[0046] Based on the imaging results, the location of the defect area can be determined by human judgment or by computer image processing.

[0047] In one embodiment, Figure 2 As shown, the imaging enhancement device further includes a current probe 220; a current probe 220 is provided in a loop to adjust the resistance value of the variable resistor 210-1 in the loop according to the current measured by the current probe 220.

[0048] The current probe 220 may adopt various current detection devices known to those skilled in the art now or in the future to obtain the current in the loop.

[0049] By obtaining the current in the loop, the embodiment of the present application can timely adjust the resistance value of the variable resistor 210 - 1 based on the current value, thereby ensuring that the current in multiple loops is balanced.

[0050] In one implementation, the resistance of the resistor 210 ranges from 1 ohm to 100 ohms.

[0051] In the embodiment of the present application, the resistance value of the resistor 210 may be close to the resistance value of the contact resistance in the loop.

[0052] In one example, the resistance of the resistor 210 may be greater than the resistance of the contact resistance in the loop. The difference between the resistance of the resistor 210 and the resistance of the contact resistance in the loop may be 5-30 ohms.

[0053] In the case where the resistance value of the contact resistance in the loop cannot be determined, the resistance value of the resistor 210 may be the minimum resistance value for achieving current balance in multiple loops.

[0054] In the embodiment of the present application, current balancing can be that the currents in multiple loops are equal or nearly equal, or the current difference in multiple loops is within a preset range. The maximum difference between the multiple currents corresponding to the multiple loops is the maximum value that does not affect the imaging brightness and darkness effect.

[0055] In one embodiment, a first terminal row 240 is further included, and the first terminal row 240 includes a plurality of terminals; the first end of the resistor 210 is electrically connected to the first end of the main grid 310 through the terminal. Specifically, the first end of the resistor 210 is electrically connected to the first end of the main grid 310 in the battery cell 300, which is achieved in the following manner: the first end of the main grid 310 is electrically connected to the terminal, and the terminal is electrically connected to the first end of the resistor 210.

[0056] In the embodiment of the present application, multiple terminals are configured through the first terminal row 240, the first end of the main grid 310 is electrically connected to the terminal, and then electrically connected to the first end of the resistor 210, which can facilitate the connection of the circuit and at the same time achieve and ensure insulation and independence between multiple circuits.

[0057] In order to better insulate and separate multiple circuits from each other, a contact block can be provided on the terminal. The contact block is a preset lead connection structure, so that the lead can be electrically connected by a clamping or similar method.

[0058] The embodiment of the present application realizes the connection between the main grid 310 and the resistor 210 in the battery cell 300 through the first terminal row 240, which can facilitate the rapid access of the battery cell 300, facilitate continuous detection of multiple battery cells 300 on the assembly line, and improve the detection efficiency of the battery cells.

[0059] In one example, the imaging enhancement device of the embodiment of the present application further includes a second terminal row, and the second end of the main grid 310 is electrically connected to the power supply 100 through a terminal of the second terminal row, further improving the access speed of the battery cell 300 and improving the detection efficiency.

[0060] In one embodiment, Figure 3 As shown, the first terminal row 240 and the plurality of resistors 210 are integrated on a terminal board 200 .

[0061] In one example, the terminal board 200 includes at least three edges; the terminal board 200 may be a triangle, a quadrilateral, or a polygon with more sides than four sides. At least one row of terminals of the first terminal row 240 is arranged along the first edge; the first ends of the plurality of resistors 210 are arranged close to the second edge, and the second ends of the plurality of resistors 210 are arranged close to the third edge.

[0062] In the embodiment of the present application, by arranging the port that needs to be electrically connected close to the edge of the terminal board 200, it can be easily and quickly accessed, further improving the detection efficiency.

[0063] In one example, if Figure 3 As shown, the terminal board 200 is a rectangular structure, the first terminal row 240 includes a left terminal row 241 and a right terminal row 242, the left terminal row 241 is arranged near the first edge of the terminal board 200, and the main grid 310 of the battery cell 300 can be connected to multiple connection ports of the left terminal row 241. The multiple connection ports of the right terminal row 242 can be electrically connected to the first ends of the multiple resistors 210 respectively, and the connection port formed by the second ends of the multiple resistors 210 on the terminal board 200 is then electrically connected to the power supply 100.

[0064] In the terminal board 200, the number of connection ports of the left terminal row 241 is greater than or equal to the number of main grids 310 in the battery cell 300; as an example, the number of connection ports of the left terminal row 241 can be greater than the number of main grids 310 in the battery cell 300, so as to provide spare connection ports for detecting the battery cell 300.

[0065] In the terminal board 200 , at the resistance unit, the number of connected resistors 210 is greater than or equal to the number of connection ports of the left terminal row; as an example, the number of connected resistors 210 can be greater than the number of connection ports of the left terminal row to provide spare resistors 210 .

[0066] In order to better insulate and separate multiple circuits from each other, such as Figure 3 As shown, a contact block 250 may be provided on the connection port of the resistor 210. The contact block 250 is a preset lead connection structure, so that the lead can be electrically connected by a clamping or similar method.

[0067] After the resistor 210 unit and the first terminal row 240 are integrated into a terminal board 200, the terminal board 200 can be connected to a circuit as an integral device. Figure 4 As shown, the positive or negative pole of the power source 100 is connected to the terminal board 200, and the terminal board 200 is connected to multiple leads 230, and the multiple leads 230 are respectively connected to multiple probes 270, and the probes 270 are used to contact the main grid 310 of the battery cell 300 to form a loop. By contacting the probes 270 with the battery cell 300, the assembly line detection of multiple battery cells 300 can be carried out more quickly, thereby improving the detection efficiency.

[0068] Other components of the imaging enhancement device in the above embodiment may adopt various technical solutions known to ordinary technicians in this field now and in the future, and will not be described in detail here.

[0069] The embodiment of the present application also provides a battery cell detection device, including an imaging device and an imaging enhancement device.

[0070] Imaging enhancement devices and imaging apparatus;

[0071] The imaging enhancement device is electrically connected to a plurality of main grids of the cell to form a plurality of loops, each loop comprising a resistor and a main grid connected in series;

[0072] The imaging device is used to photograph the battery cell.

[0073] In one embodiment, it further includes a control mechanism;

[0074] The resistor is a variable resistor, and each loop is also connected in series with a current probe;

[0075] The control mechanism is communicatively connected with the current probe of each loop;

[0076] The control mechanism collects the electrical signal of the current probe and adjusts the resistance value of the variable resistor in the corresponding loop according to the electrical signal so that the current difference between the multiple loops is within a preset range;

[0077] The imaging device photographs the battery cell when the current difference between the multiple loops is within a preset range.

[0078] In one example, the control mechanism is connected to the current probe in communication to collect the electrical signal of the current probe; the control mechanism can be electrically connected to the sliding switch of the variable resistor to adjust the resistance value of the variable resistor. The control mechanism can be a computer or other terminal device. The control mechanism determines whether the resistance value of the variable resistor needs to be adjusted based on the read current signal, and based on the determination result, operates the sliding switch of the corresponding variable resistor to adjust the resistance value of the variable resistor.

[0079] In one embodiment, the imaging device is an electroluminescent imaging device, ie, an EL imaging device.

[0080] The other components of the battery cell detection device of the above embodiment can adopt various technical solutions known to ordinary technicians in this field now and in the future, and will not be described in detail here.

[0081] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0085] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An imaging enhancement device, characterized in that: include: A resistor unit, the resistor unit comprising a plurality of resistors connected in parallel; a first end of one of the resistors is electrically connected to a first end of a main grid in a battery cell, and a second end of the resistor and a second end of the main grid are electrically connected to a positive and negative electrode of a power source, respectively, to form a loop; Wherein, the battery cell includes a plurality of the main grids, and one main grid corresponds to one resistor to form a plurality of the loops.

2. The imaging enhancement device according to claim 1, characterized in that: The resistor is a variable resistor.

3. The imaging enhancement device according to claim 2, characterized in that: It also includes a current probe; one of the loops is provided with the current probe so as to adjust the resistance value of the variable resistor in the loop according to the current measured by the current probe.

4. The imaging enhancement device according to any one of claims 1 to 3, characterized in that: The resistance value of the resistor ranges from 1 to 100 ohms.

5. The imaging enhancement device according to any one of claims 1 to 3, characterized in that: It also includes a first terminal row, which includes a plurality of terminals; the first end of the resistor is electrically connected to the first end of the main grid through the terminal.

6. The imaging enhancement device according to claim 5, characterized in that: The first terminal row and the plurality of resistors are integrated on a terminal board.

7. The imaging enhancement device according to claim 6, characterized in that: The terminal plate includes at least three edges; At least one row of terminals of the first terminal row is arranged along the first edge; The first ends of the plurality of resistors are arranged close to the second edge, and the second ends of the plurality of resistors are arranged close to the third edge.

8. A battery cell detection device, characterized in that: Including imaging enhancement devices and imaging devices; The imaging enhancement device is electrically connected to a plurality of main grids of the cell to form a plurality of loops, each loop comprising a resistor and a main grid connected in series; The imaging device is used to photograph the battery cell.

9. The battery cell detection device according to claim 8, characterized in that: It also includes control agencies; The resistor is a variable resistor, and each loop is also connected in series with a current probe; The control mechanism is in communication connection with the current probe of each loop; The control mechanism collects the electrical signal of the current probe, and adjusts the resistance value of the variable resistor in the corresponding loop according to the electrical signal, so that the current difference between the multiple loops is within a preset range; The imaging device photographs the battery cell when the current difference between the multiple loops is within a preset range.

10. The battery cell detection device according to claim 8 or 9, characterized in that: The imaging device is an electroluminescent imaging device.

Images