Detection and grading method for battery strings

Abstract

The invention provides a detection and grading method for a cell string, and relates to the technical field of solar cell preparation. The detection and grading method for the battery string can comprise the step of controlling the battery string manufacturing equipment to electrically connect battery pieces based on an instruction to obtain the battery string. And controlling the battery string detection equipment to detect the IV performance of the battery string. And obtaining the power, the current, the filling factor, the open-circuit voltage and the series resistance of each battery string according to the IV performance. And controlling the battery string grading equipment to divide the battery strings with the power, the current, the fill factor, the open-circuit voltage or the series resistance at the same gear into the same group. And scrapping and repairing the same group of battery strings or further forming a battery assembly. The performance of the formed cell strings of the same cell assembly is ensured to be similar, and the efficiency and stability of the solar cell are improved.

Description

Technical Field

[0001] The invention relates to the technical field of solar cell preparation, and in particular to a detection and grading method for a battery string. Background Art

[0002] The production steps of solar cells generally include forming cells, welding the cells to form cell strings, and arranging and laminating the cell strings to form solar cells. In the current prior art, the performance of solar cells is generally tested after the cells are produced and finally formed into solar cells. After the cells are formed into cell strings, there is no testing process for the cell strings. This will cause many cells with good performance to have poor performance of the cell strings formed due to poor welding process, resulting in low efficiency of solar cells, and ultimately leading to a decrease in the production capacity of qualified solar cells. Summary of the invention

[0003] An object of the first aspect of the present invention is to provide a solar cell grading method to solve the problem of low efficiency of solar cells prepared in the prior art.

[0004] Specifically, the present invention provides a battery string detection and grading method, using a detection and grading system to perform performance detection and grading on the battery string; the detection and grading system includes a battery string manufacturing device, a battery string detection device and a battery string grading device, and the battery string detection and grading method includes:

[0005] Based on the instruction, control the battery string manufacturing equipment to electrically connect the battery cells to obtain a battery string;

[0006] Controlling the battery string detection device to detect the IV performance of the battery string;

[0007] Obtaining power, current, fill factor, open circuit voltage and series resistance of each battery string according to the IV performance;

[0008] Controlling the battery string binning device to bin the battery strings with the power, the current, the fill factor, the open circuit voltage or the series resistance at the same level into the same group; wherein the levels are divided into a plurality of levels, each level having a value in a range, and the values ​​of the plurality of levels are sequentially set from small to large or from large to small;

[0009] The battery strings of the same group are scrapped, repaired or further formed into battery assemblies.

[0010] Optionally, before controlling the battery string detection device to detect the IV performance of the battery string, the method further includes:

[0011] Detecting the photoluminescence and / or electroluminescence of the battery string to obtain a photoluminescence image and / or an electroluminescence image;

[0012] Determining whether the photoluminescence image and / or the electroluminescence image of the battery string meets requirements;

[0013] If yes, the battery string detection device is controlled to detect the IV performance of the battery string.

[0014] Optionally, before scrapping, repairing or further forming the battery assembly of the battery strings of the same group, the process further includes:

[0015] Determining whether the battery string enters the next step of forming the battery assembly;

[0016] If so, determining whether the time from the battery string detection device detecting the IV performance of the battery string to the battery string entering the next step of forming the battery assembly is greater than a preset value;

[0017] If yes, the IV performance of the battery string is retested.

[0018] Optionally, before the battery string is obtained by controlling the battery string manufacturing equipment to electrically connect the battery cells based on the instruction, the method further includes:

[0019] A cell with a preset length is provided; wherein the cell includes any one of a heterojunction cell, a single junction perovskite cell (PSC), a stacked perovskite cell, an interdigitated back contact cell (IBC), a tunneling oxide passivation contact cell (TOPCon), an emitter back passivation cell (PERC), and an aluminum back field cell (BSF).

[0020] Optionally, the step of controlling the battery string manufacturing equipment to electrically connect the battery cells to obtain the battery string includes:

[0021] Connecting the main grids of the plurality of battery cells with welding strips to form the battery string; or

[0022] Connecting the main grids of the plurality of battery cells to welding strips to form an alloy, and then connecting the main grids to the welding strips by UV dispensing to form the battery string; or

[0023] Connecting the plurality of battery cells through UV glue and welding ribbon to form the battery string; or

[0024] Pressing and connecting a plurality of the battery sheets with the copper wire composite film to form the battery string; or

[0025] The battery string is formed by stacking a plurality of the battery sheets through conductive adhesive.

[0026] Optionally, the battery string detection device comprises:

[0027] A carrying assembly, including a carrier plate, for carrying the battery string; and

[0028] At least one solar simulator, which is arranged on one side of the supporting assembly and is used to provide a light source, and the light irradiated by the solar simulator covers the battery string;

[0029] Wherein, before controlling the battery string detection device to detect the IV performance of the battery string, the method further includes:

[0030] Controlling the carrier plate to maintain horizontality;

[0031] The solar simulator is controlled to maintain horizontality.

[0032] Optionally, the battery string detection device further comprises a tester, the tester comprises a probe row, and the IV performance of the battery string is detected by the probe row;

[0033] The step of controlling the battery string detection device to detect the IV performance of the battery string includes:

[0034] Controlling to turn on one or more of the solar simulators; wherein the light from each of the solar simulators irradiates the battery string;

[0035] Controlling and driving the probe row to contact the battery string;

[0036] The tester is controlled to be turned on, and the IV performance of the battery string is detected by using the tester.

[0037] Optionally, a first drive assembly;

[0038] A gantry, which moves along a first preset direction under the drive of the first drive assembly;

[0039] A fixing seat, used to fix the probe row, the fixing seat being connected to the gantry so as to drive the probe row to move along the first preset direction when the gantry moves; and

[0040] A slide cylinder, which is arranged between the gantry and the fixing seat, to drive the fixing seat to move relative to the carrier along a second preset direction, thereby making the probe row approach or move away from the battery string; wherein the second preset direction is perpendicular to the first preset direction;

[0041] The step of controlling and driving the probe row to contact the battery string includes:

[0042] Controlling the first driving assembly to drive the gantry to move to a position where the probe row corresponds to the battery string;

[0043] The slide cylinder is controlled to move until the probe row and the battery string are in contact with each other.

[0044] Optionally, the battery string detection device further includes a temperature control system;

[0045] When the IV performance of the battery string is tested by the tester, the method further includes:

[0046] The temperature control system is used to control the temperature of the battery string so that the temperature of the battery string is within a preset range.

[0047] Optionally, the temperature control system comprises:

[0048] A temperature detection device, disposed on one side of the battery string, for detecting the temperature of the battery string;

[0049] a control module connected to the temperature detection device to issue a control instruction according to the temperature of the temperature detection device; and

[0050] a cooling device, disposed at one side of the battery string, for receiving the control instruction of the control module and adjusting the fluid flow so that the temperature of the battery string is within the preset range;

[0051] The step of controlling the temperature of the battery string by using the temperature control system so that the temperature of the battery string is within a preset range comprises:

[0052] detecting a temperature of the battery string;

[0053] Determining whether the temperature is within a preset range;

[0054] If yes, controlling the fluid in the cooling device to flow according to the current flow rate;

[0055] If not, when the temperature is greater than the maximum temperature within the preset range, the flow rate of the fluid in the cooling device is controlled to increase; when the temperature is less than the minimum temperature within the preset range, the flow rate of the fluid in the cooling device is controlled to decrease or the cooling device is turned off.

[0056] Optionally, the battery string detection device further comprises a homogenizing plate, which is arranged between the solar simulator and the battery string, so that the light emitted by the solar simulator passes through the homogenizing plate and then irradiates the battery string.

[0057] Optionally, there are multiple solar simulators; the light emitted by adjacent solar simulators at least partially overlaps before irradiating the homogenizing plate; the light spots emitted by multiple solar simulators form a continuous light spot of a preset shape after passing through the homogenizing plate, and the preset shape matches the shape of the battery string.

[0058] In this solution, after the battery string manufacturing equipment of the battery string grading system welds the battery cells to form a battery string, the IV performance of the battery string is tested by the battery string testing equipment, and the power, current, fill factor, open circuit voltage and series resistance of the battery string are obtained according to the performance of the battery string. The battery string grading equipment divides the battery strings with the same power, current, fill factor, open circuit voltage and series resistance into a group according to the power, current, fill factor, open circuit voltage and series resistance of the battery string and the pre-grading data, and the battery strings divided into the same group are scrapped, repaired or further formed into battery modules, thereby ensuring that the performance of the battery strings of the same battery module is similar, thereby improving the efficiency and stability of the solar cell.

[0059] In this solution, before testing the IV performance of the battery string, it is necessary to first test the photoluminescence or electroluminescence image of the battery string, and then determine whether the battery string is defective through the photoluminescence image or electroluminescence image. If there is a defect, it will be scrapped or repaired. If there is no defect, it will proceed to the next step of IV performance testing, thereby reducing the IV performance testing steps of defective battery strings and reducing energy loss.

[0060] This solution limits the time between the IV performance detection of the battery string and the formation of the battery assembly by the battery string, which can effectively reduce the impact of some factors in the process from the battery string performance detection to the next step of the battery string production on the battery assembly, thereby improving the performance of the solar cell.

[0061] The supporting assembly of the battery string detection device of this solution is used to support the battery string, and the solar simulator is used to provide light source for the battery string performance detection. Before the detection, the solar simulator and the battery string need to be kept level to avoid misalignment or protrusion, thereby avoiding affecting the intensity of light irradiating the battery string, thereby improving the accuracy of the IV performance detection of the battery string.

[0062] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0064] Figure 1 is a schematic structural block diagram of a battery assembly preparation device according to a specific embodiment of the present invention;

[0065] Figure 2 is a schematic flow chart of a method for binning a solar cell according to a specific embodiment of the present invention;

[0066] Figure 3 is a schematic flow chart of a method for binning a solar cell according to another specific embodiment of the present invention;

[0067] Figure 4 is a schematic structural block diagram of the battery string classification and the post-classification process according to a specific embodiment of the present invention;

[0068] Figure 5 is a schematic flow chart of a method for binning a solar cell according to another specific embodiment of the present invention;

[0069] Figure 6 is a schematic flow chart of a method for binning a solar cell according to another specific embodiment of the present invention;

[0070] Figure 7 is a schematic three-dimensional diagram of a battery string detection device according to a specific embodiment of the present invention;

[0071] Figure 8 is a schematic flow chart of steps before controlling a battery string detection device to detect IV performance of a battery string according to a specific embodiment of the present invention;

[0072] Fig. 9 is a schematic structural diagram of a homogenizing sheet of a battery string detection device according to a specific embodiment of the present invention;

[0073] Fig.10 is a schematic flow chart of steps for controlling a battery string detection device to detect IV performance of a battery string according to a specific embodiment of the present invention;

[0074] Fig.11 is a partial schematic structural diagram of a battery detection device according to a specific embodiment of the present invention;

[0075] Fig.12 is a schematic flow chart of steps for controlling a battery string detection device to detect IV performance of a battery string according to another specific embodiment of the present invention;

[0076] Fig.13 is a partial schematic structural diagram of a battery detection device according to a specific embodiment of the present invention;

[0077] Fig.14 is a schematic flow chart of steps for controlling the temperature of a battery string by using a temperature control system so that the temperature of the battery string is within a preset range according to a specific embodiment of the present invention;

[0078] Fig.15 is a schematic structural diagram of a solar simulator according to a specific embodiment of the present invention;

[0079] Fig.16 is a schematic structural diagram of a solar simulator according to a specific embodiment of the present invention at one angle;

[0080] Fig.17 is a schematic structural diagram of a solar simulator according to a specific embodiment of the present invention from another angle;

[0081] Fig.18 is a side view of a fly-eye lens of a solar simulator according to a specific embodiment of the present invention;

[0082] Fig.19 is a top view of a fly-eye lens of a solar simulator according to a specific embodiment of the present invention;

[0083] Fig. 20 is a top view of a fly-eye lens of a solar simulator according to another specific embodiment of the present invention;

[0084] Fig.21 is a light path principle diagram of light sources arranged on two sides of a solar simulator according to a specific embodiment of the present invention;

[0085] Fig. 22 is a schematic structural diagram of a solar simulator according to another specific embodiment of the present invention.

[0086] Description of reference numerals:

[0087] Detection and grading system-10; Battery string manufacturing equipment-11; Battery string detection equipment-12; Battery string grading equipment-13; Typesetting machine-20; Stitch welding machine-30; Laminating machine-40;

[0088] Carrying assembly-300; carrier plate-320; through hole-321; adsorption assembly-322; first driving assembly-330; motor-331; driving wheel-332; transmission belt-333; gantry-341; fixed seat-342; slide cylinder-343;

[0089] Solar simulator-100; homogenizing sheet-400; grid point-401; second driving component-500; temperature control component-600; temperature detection device-610; cooling device-620;

[0090] Light source 101; simulated light group 110; lamp cup 111; first side surface 120; second side surface 130; dichroic mirror 140; spectrometer 150; first fly-eye lens 160; sub-lens 161; first Fresnel lens 170; second fly-eye lens 180; second Fresnel lens 190;

[0091] Xenon lamp-102; filter-103; light homogenizer-104. DETAILED DESCRIPTION

[0092] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0093] As a specific embodiment of the present invention, Figure 1 and Figure 2 As shown, this embodiment provides a battery string detection and grading method, using a detection and grading system 10 to perform performance detection and grading on the battery string; the detection and grading system 10 includes a battery string manufacturing device 11, a battery string detection device 12 and a battery string grading device 13. Specifically, the battery string detection and grading method of this embodiment may include:

[0094] Step S100, based on the instruction, controlling the battery string manufacturing equipment 11 to electrically connect the battery cells to obtain a battery string;

[0095] Step S200, controlling the battery string detection device 12 to detect the IV performance of the battery string;

[0096] Step S300, obtaining the power, current, fill factor, open circuit voltage and series resistance of each battery string according to the IV performance;

[0097] Step S400, controlling the battery string binning device 13 to bin the battery strings with the same power, current, fill factor, open circuit voltage or series resistance into the same group; wherein the bins are divided into multiple, each of which has a value in a range, and the values ​​of the multiple bins are sequentially set from small to large or from large to small;

[0098] Step S100, scrapping, repairing or further forming battery modules of the same group of battery strings.

[0099] Specifically, in this embodiment, after the battery cells are welded to form a battery string by the battery string manufacturing equipment 11 of the battery string grading system 10, the IV performance of the battery string is detected by the battery string detection equipment 12, and the power, current, fill factor, open circuit voltage and series resistance of the battery string are obtained according to the IV performance of the battery string. The battery string grading equipment 13 divides the battery strings with the power, current, fill factor, open circuit voltage and series resistance of the battery string at the same level into a group according to the power, current, fill factor, open circuit voltage and series resistance of the battery string and the pre-grading data, and the battery strings divided into the same group are scrapped, repaired or further formed into battery assemblies, thereby ensuring that the performance of the battery strings of the same battery assembly is similar, thereby improving the efficiency and stability of the solar cells.

[0100] Specifically, Figure 3 As shown, in this embodiment, IV data can be obtained by detecting the IV performance of the battery string, and then the power, current, fill factor, open circuit voltage and series resistance of the battery string can be obtained through the IV data. You can selectively use power, current, fill factor, open circuit voltage or series resistance data. When you choose to use power data, you can preset the power gear and the power data range of each gear in advance. When the power of the battery string is within the power data range of a certain gear, it can be divided into this group, and so on. When you choose to use current data, you can set the current gear in advance, as well as the current data range of each gear. When the current of the battery string is within the data range of the current of a certain gear, it is divided into this group, and so on. Similarly, when you choose to use fill factor, open circuit voltage or series resistance data, set the fill factor, open circuit voltage or series resistance gear in advance, and the data orientation of each gear fill factor, open circuit voltage or series resistance. When the fill factor, open circuit voltage or series resistance of the battery string is within the data range of a certain gear, it is divided into this group, and so on.

[0101] Specifically, during the production of solar cells, the battery cells can be electrically connected to form battery strings. After the battery strings are formed, the performance of the battery strings is tested to obtain data, and then the battery strings are classified. After the number of battery strings in each group reaches a certain amount, they are laid out and laminated to form battery modules.

[0102] As a specific embodiment of the present invention, Figure 3 As shown, in step S100, the battery string manufacturing device 11 electrically connects the battery cells, and before obtaining the battery string, the following steps may also be included:

[0103] Step S600: providing a battery cell of a preset length.

[0104] Specifically, the cell of this embodiment may also include any one of a heterojunction cell, a single junction perovskite cell (PSC), a stacked perovskite cell, an interdigitated back contact cell (IBC), a tunneling oxide passivation contact cell (TOPCon), an emitter back passivation cell (PERC), and an aluminum back field cell (BSF).

[0105] Specifically, the battery cells welded into a battery string each time are of the same type, and the battery strings for grading the battery strings also need to be of the same type.

[0106] More specifically, in step S100 of this embodiment, the steps of controlling the battery string manufacturing equipment 11 to electrically connect the battery cells to obtain the battery string may include:

[0107] Connecting the main grids of multiple solar cells with welding strips to form a solar cell string; or

[0108] Connect the main grids of multiple battery cells to the welding ribbon to form an alloy, and then connect them to the welding ribbon through UV dispensing to form a battery string; or

[0109] Connect multiple cells with UV glue and welding ribbon to form a battery string; or

[0110] Connecting multiple battery cells with copper wire composite films by pressing and laminating to form a battery string; or

[0111] Multiple battery cells are stacked together using conductive adhesive to form a battery string.

[0112] Specifically, in this embodiment, the welding of the welding strip and the main grid silver paste of the battery cell to form an alloy mainly includes MBB technology, SMBB technology, and BC back welding technology. The welding strip and the main grid silver paste of the battery cell are first welded to form an alloy, and then connected to the welding strip by UV dispensing to form a battery string, which can adopt NBB technology. NBB technology is used to connect multiple battery cells to the welding strip through UV glue to form a battery string. Film coating technology can be used to press and connect multiple battery cells with copper wire composite film to form a battery string. Shingling technology can be used to stack multiple battery cells through conductive glue to form a battery string.

[0113] Specifically, in actual equipment, such as Figure 1 As shown, after the battery string grading system 10, a typesetting machine 20, a stitch welding machine 30 and a laminator 40 may also be included. After the grouped battery strings are transmitted to the typesetting machine 20, the stitch welding machine 30 and the laminator 40, a battery assembly is formed. Specifically, the battery string manufacturing equipment 11, the typesetting machine 20, the stitch welding machine 30 and the laminator 40 in this embodiment can all be devices that can realize solar cell preparation in the prior art, and the specific structure is not limited.

[0114] Specifically, the number of gears and the numerical range of the gears in this embodiment can be set according to actual conditions, which is related to factors such as the area and number of battery cells.

[0115] Specifically, Figure 3 As shown, Figure 4 As shown, a specific embodiment is briefly described below:

[0116] Take the test sample as an example, a battery string consisting of 11 HJT battery cells (182*105cm), with an area of ​​0.212m 2 .

[0117] The first IV electrical performance parameters of 50 battery strings are tested by an IV tester. Usually, the battery strings can be divided into two categories: Pmpp (power) and Isc (current).

[0118] For example, if Pmpp (power / W) is divided into 4 gears, the setting range of the high gear a is 50.45W≥a>50.35W; the setting range of the middle gear b is 50.35W≥b>50.15W, the setting range of the low gear c is 50.15W≥c≥49.95W, and the setting range of the ultra-low gear d is 49.95W>d.

[0119] For example, if Isc (current / A) is divided into 4 gears, the setting range of the high gear A is 7.82A≥A>7.8A, the setting range of the middle gear B is 7.8A>B≥7.78A, the setting range of the low gear C is 7.78A≥C≥7.76A, and the setting range of the ultra-low gear D is 7.76A>D.

[0120] The battery strings of different gears (Pmpp / Isc) flow into their corresponding battery string buffer areas to prepare for the next step of component production. The ultra-low-grade battery strings can be further screened for repair or scrap recycling. The battery strings in the above-mentioned high-grade, medium-grade and low-grade ranges can be further made into solar cells.

[0121] As another specific embodiment of the present invention, Figure 5 As shown, before step S200 controls the battery string detection device 12 to detect the IV performance of the battery string, the following steps are also included:

[0122] Step S700, detecting the photoluminescence and / or electroluminescence of the battery string to obtain a photoluminescence image and / or electroluminescence image;

[0123] Step S800, determining whether the photoluminescence image and / or electroluminescence image of the battery string meets the requirements; if so, executing step S200, if not, returning the battery string for repair or scrapping.

[0124] Specifically, in this embodiment, before testing the IV performance of the battery string, it is necessary to first test the photoluminescence or electroluminescence image of the battery string, and then determine whether the battery string is defective through the photoluminescence image or electroluminescence image. If it is defective, it will be scrapped or repaired. If it is not defective, it will proceed to the next step of IV performance testing, thereby reducing the IV performance testing steps of defective battery strings and reducing energy loss.

[0125] Specifically, the detection of photoluminescence or electroluminescence in this embodiment can be performed by the battery string detection device 12 .

[0126] As another specific embodiment of the present invention, Figure 6 As shown, before the step S500 of this embodiment scraps, repairs or further forms a solar cell with the same group of battery strings, it also includes:

[0127] Step S900, determining whether the battery string enters the next step of forming a battery assembly; if so, proceeding to step S110, if not, proceeding to step S500;

[0128] Step S110, determining whether the time from the battery string detection device 12 detecting the IV performance of the battery string to the battery string entering the further formation of the battery assembly is greater than a preset value. If so, return to step S200; otherwise, proceed to step S500.

[0129] Specifically, in this embodiment, if the time between the IV performance test of the battery string and the entering of the typesetting machine is too long, some external factors may affect the battery string during the process, thereby making the performance of the formed battery assembly poor. This embodiment limits the time between the IV performance test of the battery string and the formation of the battery assembly by the battery string, which can effectively reduce the impact of some factors in the process from the performance test of the battery string to the next step of the battery string production on the battery assembly, thereby improving the performance of the solar cell. Specifically, the preset value of this embodiment can be about 30 minutes.

[0130] As a specific embodiment of the present invention, Figure 7 and Figure 8 As shown, the battery string detection device 12 in this embodiment may include a carrier assembly 300 and at least one solar simulator 100. The carrier assembly 300 may include a carrier plate 320, which is used to carry the battery string. At least one solar simulator 100 is arranged on one side of the carrier assembly 300 to provide a light source, and the light irradiated by the solar simulator 100 covers the battery string.

[0131] Wherein, before step S200 controls the battery string detection device 12 to detect the IV performance of the battery string, the following steps are also included:

[0132] Step S130, controlling the carrier plate 320 to maintain a horizontal state;

[0133] Step S140, controlling the solar simulator 100 to maintain horizontality.

[0134] Specifically, in this embodiment, the carrying assembly 300 of the battery string detection device 12 is used to carry the battery string, and the solar simulator 100 is used to provide a light source for the battery string when performing IV performance detection. Before the detection, the solar simulator 100 and the battery string need to be kept level to avoid misalignment or protrusions, thereby avoiding affecting the intensity of light irradiating the battery string, thereby improving the accuracy of the IV performance detection of the battery string.

[0135] As a specific embodiment of the present invention, at least one through hole 321 is provided at the carrier 320 of this embodiment. The carrier assembly 300 may further include an adsorption assembly 322, which is provided at the through hole 321, and the adsorption assembly 322 is configured to blow air into the through hole so that the battery string is adsorbed on the carrier 320.

[0136] Specifically, a battery string needs to be arranged on the carrier 320 of this embodiment. In order to ensure that the battery string does not move during the detection process, a through hole 321 is arranged on the carrier 320, and an adsorption component 322 is arranged at the through hole 321. The adsorption component 322 may be a Bernoulli suction cup. Air is blown toward the through hole 321 of the carrier 320 through the Bernoulli suction cup, so that the battery string is adsorbed on the carrier 320.

[0137] Specifically, each carrier plate 320 of the present embodiment may include two through holes, and an adsorption component 322 is disposed at each through hole 321 .

[0138] Specifically, the solar simulator 100 in the battery string detection device 12 in this embodiment may include one or more solar simulators 100. The light emitted by the one or more solar simulators 100 must cover the entire battery string.

[0139] The light of the solar simulator 100 is generally strong in the middle and weak at the periphery. In order to ensure that the light irradiating the battery string reaches a certain energy level, the light irradiated by the solar simulator 100 needs to cover the battery string and make the battery string located at a position with a higher energy level in the middle of the light.

[0140] As a specific embodiment of the present invention, Fig. 9 As shown, the battery string detection device 12 of this embodiment may further include a homogenizing sheet 400 , which is disposed between the solar simulator 100 and the battery string, so that the light emitted by the solar simulator 100 passes through the homogenizing sheet 400 and irradiates the battery string.

[0141] Specifically, in this embodiment, a homogenizing sheet 400 is disposed between the solar simulator 100 and the battery string, so that the light irradiated onto the battery string is more uniform, thereby making the detection data of the battery string more accurate.

[0142] As a specific embodiment of the present invention, when there are multiple solar simulators 100, the positions between the multiple solar simulators 100 can be adjusted so that the light from the multiple solar simulators 100 is irradiated on the battery string together. Specifically, the light emitted by adjacent solar simulators 100 at least partially overlaps before irradiating the homogenizing plate 400. The light spots emitted by the multiple solar simulators 100 form a continuous light spot of a preset shape after passing through the homogenizing plate 400, and the preset shape matches the shape of the battery string.

[0143] The light overlapped parts of multiple solar simulators 100 can be homogenized by the homogenizing sheet 400, so as to avoid excessive light intensity in the overlapping parts, which would affect the detection of the battery string.

[0144] The homogenizing sheet 400 of this embodiment may include a grid glass, and a plurality of unevenly arranged grid points 401 are provided on the surface of the grid glass, so that the light emitted by the solar simulator 100 is homogenized after passing through the grid points 401 .

[0145] Specifically, the distribution of the grid points 401 in the grid glass of this embodiment is related to the intensity of light, the shape of the light spot, etc. of the solar simulator 100. And the distribution of the grid points 401 is also related to the number of solar simulators 100. Specifically, the grid point 401 optical system simulation design ultimately achieves the modulation of irradiation uniformity.

[0146] Since the shape of the battery string in this embodiment is generally rectangular, the light irradiated by the solar simulator 100 in this embodiment can also be rectangular, so that it can be ensured that the sunlight reaching the battery string with the smallest irradiation area reaches the required energy level.

[0147] Of course, when one solar simulator 100 cannot cover the entire battery string, multiple solar simulators 100 can be provided, and the light emitted by the multiple solar simulators 100 can still be rectangular.

[0148] As a specific embodiment of the present invention, the battery string detection device 12 of this embodiment may also include a tester (not shown in the figure), and the tester may include a probe row (not shown in the figure) to detect the IV performance of the battery string through the probe row.

[0149] Among them, Fig.10 As shown, step S200 controls the battery string detection device 12 to detect the IV performance of the battery string, including:

[0150] Step S210, controlling to turn on one or more solar simulators 100; wherein the light of each solar simulator 100 irradiates the battery string;

[0151] Step S220, controlling the driving probe row to contact the battery string;

[0152] Step S230, controlling to start the tester, and using the tester to detect the IV performance of the battery string.

[0153] Specifically, in this embodiment, before testing, the battery string testing device 12 is separated from the battery string. When the IV performance of the battery string needs to be tested, the solar simulator 100 needs to be turned on first so that the light of the solar simulator 100 is irradiated on the battery string, and then the position of the probe row is adjusted so that the probe row contacts the battery string, and then the tester is turned on to test the IV performance of the battery string.

[0154] More specifically, Fig.11 As shown, the battery string detection device 12 of this embodiment may also include a first driving component 330, a gantry 341, a fixed seat 342 and a slide electric cylinder 343. The gantry 341 moves along a first preset direction driven by the first driving component 330. The fixed seat 342 is used to fix the probe row, and the fixed seat 342 is connected to the gantry 341 to drive the probe row to move along the first preset direction when the gantry 341 moves. The slide electric cylinder 343 is arranged between the gantry 341 and the fixed seat 342 to drive the fixed seat 342 to move relative to the carrier plate 320 along a second preset direction, thereby making the probe row close to or away from the battery string; wherein the second preset direction is perpendicular to the first preset direction.

[0155] Among them, step S220 controls the step of driving the probe row to contact the battery string (such as Fig.12 shown) may include:

[0156] Step S221, controlling the first driving assembly 330 to drive the gantry 341 to move to a position where the probe row corresponds to the battery string;

[0157] Step S222, controlling the slide cylinder 343 to move until the probe row and the battery string are in contact with each other.

[0158] Specifically, each first driving assembly 330 of this embodiment may include a motor 331, a driving wheel 332, and a transmission belt 333. The driving wheel 332 rotates under the drive of the motor 331. The transmission belt 333 is disposed on the driving wheel 332 to move when the driving wheel 332 rotates.

[0159] Specifically, a first driving assembly 330 is respectively disposed on both sides of each fixing assembly 340. The two first driving assemblies 330 jointly drive the fixing assembly 340 to move. Another two first driving assemblies 330 jointly drive another fixing assembly 340 to move.

[0160] As a specific embodiment of the present invention, the battery string detection device 10 of this embodiment may also include a second driving component 500, which is connected to the support frame 310 to drive the support frame 310 to move along a third preset direction; wherein the third preset direction is perpendicular to the first preset direction, and the third preset direction is perpendicular to the second preset direction.

[0161] Specifically, the second driving assembly 500 is mainly used to drive the carrier board 320 to drive the battery string to move along the third preset direction, so as to match the position of the battery string with the light irradiated by the solar simulator 100.

[0162] As a specific embodiment of the present invention, the battery string detection device 12 of this embodiment may further include a temperature control system 600 .

[0163] Step S230, when using the tester to test the IV performance of the battery string, also includes:

[0164] The temperature control system 600 is used to control the temperature of the battery string so that the temperature of the battery string is within a preset range.

[0165] Specifically, this embodiment also controls the temperature of the battery string when performing IV performance testing on the battery string to ensure that the temperature of the battery is within a preset range, thereby avoiding self-heating of the battery string due to photocurrent during testing, thereby affecting the accuracy of the IV performance test data.

[0166] More specifically, Fig.13 As shown, the temperature control system 600 of this embodiment may include a temperature detection device 610, a control module and a cooling device 620. Among them, the temperature detection device 610 is arranged on one side of the battery string to detect the temperature of the battery string. Specifically, the temperature detection device 610 may be a temperature sensor, which can detect the temperature of the battery string. The control module is connected to the temperature detection device 610 to issue a control instruction according to the temperature of the temperature detection device 610. The cooling device 620 is arranged on one side of the battery string to receive the control instruction of the control module and then adjust the fluid flow so that the temperature of the battery string is within a preset range. Specifically, the cooling device 620 of this embodiment may be an air-cooled or water-cooled structure. The heat is taken away by the flow of gas or liquid to cool the battery string. More specifically, the cooling device 620 of this embodiment is a wind knife, and the outlet of the wind knife faces the battery string. The battery string is cooled by blowing cleaner gas to the battery string through the wind knife.

[0167] Specifically, Fig.14 As shown, the steps of controlling the temperature of the battery string by using the temperature control system 600 in this embodiment so that the temperature of the battery string is within a preset range include:

[0168] Step S231, detecting the temperature of the battery string;

[0169] Step S232, determining whether the temperature is within a preset range;

[0170] If yes, execute step S233; if no, execute step S234.

[0171] Step S233: Control the fluid in the cooling device 620 to circulate according to the current flow rate;

[0172] Step S234: when the temperature is greater than the maximum temperature within the preset range, the flow rate of the fluid in the cooling device 620 is controlled to increase; when the temperature is less than the minimum temperature within the preset range, the flow rate of the fluid in the cooling device 620 is controlled to decrease or the cooling device 620 is turned off.

[0173] Specifically, the temperature of the battery string is detected by the temperature detection device 610, and the temperature of the battery string is controlled so that the temperature of the battery string is kept within a preset range. When the temperature is within the preset range, the flow rate of the fluid of the cooling device 620 is kept unchanged. When the temperature is too high, the flow rate of the fluid of the cooling device 620 is increased. When the temperature is too low, the flow rate of the fluid of the cooling device 620 is reduced or the cooling device 620 is turned off. If the temperature of the battery string is kept within the preset range, the data when the IV performance of the battery string is detected is guaranteed to be more accurate.

[0174] As a specific embodiment of the present invention, Figure 15-17 As shown, the solar simulator 100 of this embodiment may include a light source 101 and a shaping component. The light source 101 is used to emit solar simulated light. The shaping component is used to form the simulated light emitted by the light source 101 into a light spot with a preset cross-section shape; the preset shape is a rectangle or a square.

[0175] Specifically, this embodiment forms the light emitted by the light source 101 into a rectangular or square light spot through a shaping component, which can match a rectangular battery string and reduce light loss as much as possible while satisfying the light source 101 used for battery string detection.

[0176] Specifically, Fig.18 As shown, the shaping component of this embodiment may include a first fly-eye lens 160, which is disposed on one side of the light source 101 to homogenize the simulated light and form light of a preset shape before emitting it.

[0177] Specifically, in this embodiment, a first fly-eye lens 160 is provided on one side of the light source 101, so that the light emitted from the light source 101 is more uniform after passing through the first fly-eye lens 160. The first fly-eye lens 160 is formed into a preset shape, so that the light spot of the emitted light can be formed into a preset shape. The shape of the fly-eye lens is related to the shape of the irradiated target. Specifically, the shape can be changed according to actual needs. For example, when the solar simulator 100 of this embodiment needs to irradiate the solar cell with light, since the solar cell is generally rectangular, the fly-eye lens 160 is also designed to be rectangular, so that the light emitted from the first fly-eye lens 160 is rectangular when irradiated to a plane. Of course, in other embodiments, the first fly-eye lens 160 can also be designed to be, for example, square, circular, elliptical, etc., so that the light emitted from the first fly-eye lens 160 is square, circular, elliptical, etc. shapes. Preferably, the first fly-eye lens 160 of this embodiment is designed to be square or rectangular.

[0178] Specifically, the first fly-eye lens 160 of this embodiment may include a plurality of sub-lenses 161, each of which has a preset shape. For example, Fig.19 The sub-lens 161 shown is in the shape of a square. Fig. 20 The shape of the sub-lens 161 shown is a rectangle. The curved surface R value of each sub-lens 161 can be obtained through simulation design as needed. The material used for the first compound eye lens 160 is plastic. Specifically, the shape of the sub-lens 161 of this embodiment can also be freely designed as needed. Specifically, since the shape of the irradiated battery string in this embodiment is a rectangle, in order to ensure that the light irradiated onto the battery string is also basically rectangular, the shape of the sub-lens 161 of the first compound eye lens 160 of this embodiment is designed to be a rectangle.

[0179] As a specific embodiment of the present invention, Figure 15-17 As shown, the solar simulator 100 of this embodiment may further include a dichroic mirror 140 and a spectrometer 150. The dichroic mirror 140 is disposed between the light source 101 and the first fly-eye lens 160 to divide the simulated light emitted by the light source 101 into two beams, one of which exits the dichroic mirror 140 and enters the first fly-eye lens 160 before being emitted. The spectrometer 150 is disposed on the side of the dichroic mirror 140 to receive the other beam of light from the dichroic mirror 140, and then monitor and feedback the light emitted by the light source 101 in real time.

[0180] In this embodiment, the light source 101 irradiates light to the dichroic mirror 140, and the dichroic mirror 140 is used to divide the light into two beams, one of which is irradiated to the target object (i.e., the battery string), and the other is irradiated to the spectrometer 150, so that the light irradiated to the spectrometer 150 and the target object is the light at the same position, so that the properties of the light detected in the spectrometer 150 are consistent with the properties of the light irradiated to the target object, so that the subsequent detection structure is more accurate.

[0181] Specifically, the dichroic mirror 140 of this embodiment forms an angle of 45 degrees with the side surface where the light source 101 is disposed.

[0182] Specifically, Fig.12 As shown, the dichroic mirror 140 and the side surface on which the light source 101 is disposed are both at an angle of 45 degrees, so that after the light emitted by the light source 101 passes through the dichroic mirror 140, part of it directly passes through the dichroic mirror 140 and is emitted, while part of it is reflected by the dichroic mirror 140 and then emitted.

[0183] If light sources 101 are provided on the top and the side of the solar simulator 100, the light from the two light sources 101 can be emitted after being overlapped at the dichroic mirror 140. The light emitted from the simulated light group 110 on the upper side is irradiated into the dichroic mirror 140, about 90% of the light is transmitted from the dichroic mirror 140, and about 10% of the light is reflected from the dichroic mirror 140 and emitted from the left side of the solar simulator 100. When the light emitted from the simulated light group 110 on the side is irradiated into the dichroic mirror 140, about 90% of the light is reflected from the dichroic mirror 140, and about 10% of the light is transmitted from the dichroic mirror 140.

[0184] The solar simulator 100 of this embodiment further includes a second fly-eye lens 180, which is disposed between the spectrometer 150 and the dichroic mirror 140, so that the light emitted by the light source 101 is homogenized by the second fly-eye lens 180 before being irradiated to the spectrometer 150. The second fly-eye lens 180 is the same as the first fly-eye lens 160.

[0185] Specifically, the second fly-eye lens 180 can homogenize the light emitted from the dichroic mirror 140 , thereby making the light irradiated to the spectrometer 150 after passing through the second fly-eye lens 180 more uniform.

[0186] The shape of the second fly-eye lens 180 and the shape of the sub-lens are consistent with the first fly-eye transparency, ensuring that the light irradiated to the spectrometer 150 and the emitted light are substantially consistent.

[0187] As a specific embodiment of the present invention, Figure 15-17As shown, the solar simulator 100 of this embodiment may further include a first Fresnel lens 170 , which may be disposed on a side of the first fly-eye lens 160 opposite to the light source 101 , so that light emitted from the first fly-eye lens 160 passes through the first Fresnel lens 170 before being emitted.

[0188] Specifically, in this embodiment, after the light emitted from the first fly-eye lens 160 passes through the first Fresnel lens 170 , the light can be focused on a certain plane, thereby achieving a more collimated and uniform light spot at the focal plane.

[0189] As a specific embodiment of the present invention, the solar simulator 100 of this embodiment may further include a second Fresnel lens 190, which is disposed between the second fly-eye lens 180 and the spectrometer 150. The light emitted from the second fly-eye lens 180 passes through the second Fresnel lens 190 and then irradiates the spectrometer 150.

[0190] In this embodiment, the second Fresnel lens 190 and the first Fresnel lens 170 are the same type of lens.

[0191] Specifically, the light source in the solar simulator 100 of the present embodiment is an LED light source. The LED light source includes at least one group of simulated light groups 110, each of which is provided with a plurality of LED lamp beads of different wavelengths, and the wavelength range of the light emitted by the LED lamp beads in each group of simulated light groups 110 is M to N; the light emitted by the LED lamp beads in all simulated light groups 110 forms simulated sunlight that is highly fitted with the AM1.5 spectrum; wherein, M<N, and the range of M is 300nm≤M<1200nm, and the range of N is 300nm<N≤1200nm.

[0192] Specifically, the LED lamp beads of this embodiment can be round or square. By arranging multiple LED lamp beads to fit the AM1.5 solar spectrum, since the life of LED lamp beads is generally about 2 years, the service life of the entire solar simulator 100 can be extended.

[0193] The light source 101 of this embodiment uses an LED light source, so that the energy consumption of the solar simulator 100 is much lower than that of the traditional thermal light source of the solar simulator 100. Reducing energy consumption also reduces the afterglow effect of the IV test system. In addition, the LED lamp beads of the solar simulator 100 of this embodiment have a relatively stable light intensity output. Under a certain temperature, the current stability determines the light intensity stability, and the electronic control part can ensure that the light intensity fluctuation of each flash is small. The LED lamp beads of the solar simulator 100 of this embodiment are selected to have only 300nm to 1200nm light, and there is no infrared light pollution and EL imaging interference.

[0194] In addition, the wavelength range of light emitted by the lamp beads in each simulated light group 110 of the present embodiment is M to N; M < N, and the range of M is 300nm≤M<1200nm, and the range of N is 300nm<N≤1200nm. The wavelength range of light emitted by the lamp beads in all simulated light groups 110 is 300nm to 1200nm. That is, the solar simulator 100 of the present embodiment can ultimately select lamp beads with wavelengths in the range of 300nm to 1200nm for fitting, so that a variety of lamp beads can meet the high degree of fitting matching, and the final spectrum level can reach a higher level (for example, A+), and can be maintained at this level for a long time, and can always maintain extremely low spectral mismatch during the electrical performance detection process.

[0195] Specifically, each simulated light group 110 in this embodiment can be fitted to form light within a certain wavelength range, and the light of all simulated light groups 110 can be superimposed to simulate the AM1.5 solar spectrum.

[0196] As a specific embodiment of the present invention, Fig.15 As shown, all the simulated light groups 110 of this embodiment are arranged on the same side of the solar simulator 100, and the wavelength of the light emitted by the lamp beads of each simulated light group 110 is in the range of M to N, where M is equal to 300 nm and N is equal to 1200 nm.

[0197] Specifically, when all the simulated light groups 110 of the present embodiment are arranged on the same side of the solar simulator 100, since the solar simulator 100 is completely simulated by the light emitted by the simulated light groups 110 on this side, the wavelength of the light emitted must cover all wavelength ranges, that is, 300nm to 1200nm. Of course, the number of simulated light groups 110 on the same side can be one or more. When the number of simulated light groups 110 is one, the lamp beads therein can be arranged in an array according to the shape and size of the side of the solar simulator 100. When the number of simulated light groups 110 is multiple, multiple simulated lights can be arranged in an array according to the shape and size of the side of the solar simulator 100.

[0198] As another specific embodiment of the present invention, Fig.16 and Fig.17As shown, some of the simulated light groups 110 of this embodiment are arranged on the first side 120 (e.g., the upper side in the figure) of the solar simulator 100, and the wavelength range of the light emitted by the lamp beads of each simulated light group 110 on the first side 120 is M to X, where M is equal to 300nm, and 300nm<X<1200nm. Other simulated light groups 110 are arranged on the second side 130 (e.g., the right side in the figure) of the solar simulator 100, and the wavelength of the light emitted by the lamp beads of each simulated light group 110 on the second side 130 is X to N, where 300nm<X<1200nm, and N is equal to 1200nm. The first side 120 and the second side 130 are perpendicular to each other.

[0199] As another specific embodiment of the present invention, Fig.16 and Fig.17 As shown, some simulated light groups 110 of the present embodiment are arranged on the first side 120 of the solar simulator 100, and the wavelength range of the light emitted by the lamp beads of each simulated light group 110 on the first side 120 is X~N; wherein, 300nm<X<1200nm, N is equal to 1200nm; other simulated light groups 110 are arranged on the second side 130 of the solar simulator 100, and the wavelength of the light emitted by the lamp beads of each simulated light group 110 on the second side 130 is M~X; wherein, M is equal to 300nm, 300nm<X<1200nm; wherein, the first side 120 and the second side 130 are perpendicular to each other.

[0200] Specifically, in this embodiment, the first side surface 120 may be the upper side of the solar simulator 100, and the second side surface 130 may be the side surface of the solar simulator 100 ( Fig.16 and Fig.17 The light source arranged on the right side of the figure is only one embodiment. According to the above two embodiments, the wavelength range of all the simulated light groups 110 located on the two sides is 300nm to 1200nm. However, the wavelength range of the light emitted by the simulated light group 110 located on the first side 120 and the wavelength range of the light emitted by the simulated light group 110 located on the second side 130 cannot cross each other or mix with each other.

[0201] Specifically, the lamp beads of each simulation light group 110 are arranged in an array.

[0202] Specifically, each side of the solar simulator 100 may include a plurality of simulation light groups 110, and the plurality of simulation light groups 110 are arranged in an array. Specifically, four simulation light groups 110 are arranged on each side of the solar simulator 100 of this embodiment.

[0203] When all the simulated light groups 110 are arranged on the top of the solar simulator 100, the angle between the dichroic mirror 140 and the top is 45 degrees. The light emitted by the simulated light group 110 is irradiated into the dichroic mirror 140, about 90% of the light is transmitted from the dichroic mirror 140, and about 10% of the light is reflected from the dichroic mirror 140 and emitted from the side (e.g. Fig.21 ) is issued from the left side of the .

[0204] When part of the simulated light group 110 is disposed on the upper side of the solar simulator 100, part of the simulated light group 110 is disposed on the side of the solar simulator 100 (eg Fig.21 When the light emitted by the simulated light group 110 at the upper side is irradiated into the dichroic mirror 140, about 90% of the light is transmitted from the dichroic mirror 140, and about 10% of the light is reflected from the dichroic mirror 140 and emitted from the left side of the solar simulator 100. When the light emitted by the simulated light group 110 at the side is irradiated into the dichroic mirror 140, about 90% of the light is reflected from the dichroic mirror 140, and about 10% of the light is transmitted from the dichroic mirror 140.

[0205] Specifically, in this embodiment, preferably, the simulated light groups 110 are arranged on the top and side of the solar simulator 100, so as to reduce the number or area of ​​the simulated light groups 110 located on the same side, thereby reducing the area of ​​the dichroic mirror 140 and reducing the cost.

[0206] In addition, since the reflectivity and transmittance of the dichroic mirror 140 are related to the coating thereon, the coating parameters can be designed according to the light wavelength classification of the lamp beads, so as to realize the design of the reflectivity and transmittance in different directions of the dichroic mirror 140. In this embodiment, the wavelengths of the light emitted from the simulated light group 110 on the upper side and the side of the solar simulator 100 do not cross each other, which can reduce the difficulty of manufacturing the dichroic mirror 140, and reduce the manufacturing cycle and manufacturing cost of the dichroic mirror 140.

[0207] When only the simulated light group 110 is arranged on the upper side of the solar simulator 100, the spectrometer 150 is arranged on the left side of the solar simulator 100, so as to receive the light reflected from the dichroic mirror 140. When the simulated light group 110 is arranged on both the upper side and the right side of the solar simulator 100, the spectrometer 150 is arranged on the left side of the solar simulator 100, and it can receive the light emitted by the simulated light on the upper side reflected from the dichroic mirror 140, and also receive the light emitted from the simulated light group 110 on the right side transmitted through the dichroic mirror 140. The spectrometer 150 is used to monitor the light beam in real time, collect spectral data, and monitor the spectrum and light intensity of the light source. The monitored spectrum and light intensity are the light at the same position as the spectrum and light intensity irradiated on the target object, thereby providing accuracy and consistency of detection, so that the spectrum and light intensity of the light source can be adjusted in real time later to meet the detection requirements and improve the accuracy of the detection results.

[0208] As a specific embodiment of the present invention, Fig.17 As shown, each simulated light group 110 of the present embodiment may further include a plurality of lamp cups 111, each lamp cup 111 is matched with one of the lamp beads, and each lamp cup 111 is tightly attached to the corresponding lamp bead, so that the light emitted by the lamp bead is converged by the corresponding lamp cup 111 and then emitted.

[0209] In this embodiment, the light with a divergent angle emitted by the lamp bead is converged and collimated by the lamp cup 111 .

[0210] As another specific embodiment of the present invention, Fig. 22 As shown, the light source 101 of this embodiment is a xenon lamp light source. The shaping component may include a lampshade arranged outside the xenon lamp 102, the lampshade having an opening, and the shape of the opening is a preset shape.

[0211] Specifically, by directly arranging a lampshade outside the xenon lamp 102 , the xenon lamp 102 is formed into a light spot of a preset shape, so as to match the shape of the battery string, thereby meeting the detection requirements.

[0212] As a specific embodiment of the present invention, the solar simulator 100 of this embodiment may further include a filter disposed on one side of the xenon lamp light source, so that the light emitted by the xenon lamp 102 passes through the filter 103 to form simulated sunlight that is highly fitted with the AM1.5 spectrum.

[0213] In this embodiment, the light emitted by the xenon lamp is transformed into simulated sunlight with a highly fitting spectrum of AM1.5 through a filter, thereby satisfying the light source required for IV testing of a battery string.

[0214] As a specific embodiment of the present invention, the solar simulator 100 of this embodiment may further include a light homogenizer 104 disposed on a side of the filter 103 away from the xenon lamp light source, so that light emitted from behind the filter 103 is homogenized by the light homogenizer 104 before being emitted.

[0215] The solar simulator 100 of this embodiment may further include a light homogenizer 104 , so that the light irradiated by the xenon lamp 102 is more uniform after passing through the light homogenizer 104 .

[0216] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for detecting and grading a battery string, characterized in that: The battery string is subjected to performance testing and grading by using a testing and grading system; the testing and grading system comprises a battery string manufacturing device, a battery string testing device and a battery string grading device, and the battery string testing and grading method comprises: Based on the instruction, control the battery string manufacturing equipment to electrically connect the battery cells to obtain a battery string; Controlling the battery string detection device to detect the IV performance of the battery string; Obtaining power, current, fill factor, open circuit voltage and series resistance of each battery string according to the IV performance; Controlling the battery string binning device to bin the battery strings with the power, the current, the fill factor, the open circuit voltage or the series resistance at the same level into the same group; wherein the levels are divided into a plurality of levels, each level having a value in a range, and the values ​​of the plurality of levels are sequentially set from small to large or from large to small; The battery strings of the same group are scrapped, repaired or further formed into battery assemblies.

2. The method for detecting and grading a battery string according to claim 1, characterized in that: Before controlling the battery string detection device to detect the IV performance of the battery string, the method further includes: Detecting the photoluminescence and / or electroluminescence of the battery string to obtain a photoluminescence image and / or an electroluminescence image; Determining whether the photoluminescence image and / or the electroluminescence image of the battery string meets requirements; If yes, the battery string detection device is controlled to detect the IV performance of the battery string.

3. The method for detecting and grading a battery string according to claim 1, characterized in that: Before the battery strings of the same group are scrapped, repaired or further formed into the battery assembly, the method further includes: Determining whether the battery string enters the next step of forming the battery assembly; If so, determining whether the time from the battery string detection device detecting the IV performance of the battery string to the battery string entering the next step of forming the battery assembly is greater than a preset value; If yes, the IV performance of the battery string is retested.

4. The method for detecting and grading a battery string according to any one of claims 1 to 3, characterized in that: Based on the instruction, the battery string manufacturing equipment is controlled to electrically connect the battery cells to obtain the battery string, and the method further includes: A cell with a preset length is provided; wherein the cell includes any one of a heterojunction cell, a single junction perovskite cell, a stacked perovskite cell, a cross back contact cell, a tunnel oxide passivation contact cell, an emitter back passivation cell, and an aluminum back field cell.

5. The method for detecting and grading a battery string according to any one of claims 1 to 3, characterized in that: The step of controlling the battery string manufacturing equipment to electrically connect the battery cells to obtain the battery string includes: Connecting the main grids of the plurality of battery cells with welding strips to form the battery string; or Connecting the main grids of the plurality of battery cells to welding strips to form an alloy, and then connecting the main grids to the welding strips by UV dispensing to form the battery string; or Connecting the plurality of battery cells through UV glue and welding ribbon to form the battery string; or Pressing and connecting a plurality of the battery sheets with the copper wire composite film to form the battery string; or The battery string is formed by stacking a plurality of the battery sheets through conductive adhesive.

6. The method for detecting and grading a battery string according to any one of claims 1 to 3, characterized in that: The battery string detection device comprises: A carrying assembly, including a carrier plate, for carrying the battery string; and At least one solar simulator, which is arranged on one side of the supporting assembly and is used to provide a light source, and the light irradiated by the solar simulator covers the battery string; Wherein, before controlling the battery string detection device to detect the IV performance of the battery string, the method further includes: Controlling the carrier plate to maintain horizontality; The solar simulator is controlled to maintain horizontality.

7. The method for detecting and grading a battery string according to claim 6, characterized in that: The battery string detection device further includes a tester, the tester includes a probe row, and the IV performance of the battery string is detected by the probe row; The step of controlling the battery string detection device to detect the IV performance of the battery string includes: Controlling to turn on one or more of the solar simulators; wherein the light from each of the solar simulators irradiates the battery string; Controlling and driving the probe row to contact the battery string; The tester is controlled to be turned on, and the IV performance of the battery string is detected by using the tester.

8. The detection and grading method according to claim 7, characterized in that: The battery string detection device also includes: a first drive assembly; A gantry, which moves along a first preset direction under the drive of the first drive assembly; A fixing seat, used to fix the probe row, the fixing seat being connected to the gantry so as to drive the probe row to move along the first preset direction when the gantry moves; and A slide cylinder, which is arranged between the gantry and the fixing seat, to drive the fixing seat to move relative to the carrier along a second preset direction, thereby making the probe row approach or move away from the battery string; wherein the second preset direction is perpendicular to the first preset direction; The step of controlling and driving the probe row to contact the battery string includes: Controlling the first driving assembly to drive the gantry to move to a position where the probe row corresponds to the battery string; The slide cylinder is controlled to move until the probe row and the battery string are in contact with each other.

9. The method for detecting and grading a battery string according to claim 6, characterized in that: The battery string detection device also includes a temperature control system; When the IV performance of the battery string is tested by the tester, the method further includes: The temperature control system is used to control the temperature of the battery string so that the temperature of the battery string is within a preset range.

10. The method for detecting and grading a battery string according to claim 9, characterized in that: The temperature control system comprises: A temperature detection device, disposed on one side of the battery string, for detecting the temperature of the battery string; a control module connected to the temperature detection device to issue a control instruction according to the temperature of the temperature detection device; and a cooling device, disposed at one side of the battery string, for receiving the control instruction of the control module and adjusting the fluid flow so that the temperature of the battery string is within the preset range; The step of controlling the temperature of the battery string by using the temperature control system so that the temperature of the battery string is within a preset range comprises: detecting a temperature of the battery string; Determining whether the temperature is within a preset range; If yes, controlling the fluid in the cooling device to flow according to the current flow rate; If not, when the temperature is greater than the maximum temperature within the preset range, the flow rate of the fluid in the cooling device is controlled to increase; when the temperature is less than the minimum temperature within the preset range, the flow rate of the fluid in the cooling device is controlled to decrease or the cooling device is turned off.

11. The method for detecting and grading a battery string according to claim 6, characterized in that: The battery string detection device further includes a homogenizing plate, which is arranged between the solar simulator and the battery string, so that the light emitted by the solar simulator passes through the homogenizing plate and then irradiates the battery string.

12. The method for detecting and grading a battery string according to claim 11, characterized in that: There are multiple solar simulators; the light emitted by adjacent solar simulators at least partially overlaps before irradiating the homogenizing plate; the light spots emitted by multiple solar simulators form a continuous light spot of a preset shape after passing through the homogenizing plate, and the preset shape matches the shape of the battery string.

Images