Battery testing device

Abstract

The utility model relates to the field of batteries, particularly provides a battery testing device, and aims to solve the problem that the testing result of an existing testing device is inaccurate. Therefore, the battery testing device comprises a plurality of current probes and a plurality of current leads, wherein the current lead comprises a positive current lead and a negative current lead; the forward current wires comprise a plurality of forward current transmission wires and a plurality of forward current output wires; the plurality of forward current transmission wires are connected with the current probe and form a plurality of contact points with one ends of the plurality of forward current output wires; the negative current lead comprises a plurality of negative current transmission leads and a plurality of negative current output leads; the plurality of negative current transmission wires are connected with the current probe and form a plurality of contact points with one ends of the plurality of negative current output wires. Through the above implementation mode, the main grid at the edge position and the main grid at the middle position of the battery can transmit current through different contact points, the problem of local brightness is avoided, and the test result is more accurate.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery testing device. Background Technology

[0002] A back contact (BC) cell is a photovoltaic cell in which both the positive and negative electrodes are arranged on the back side. When testing a BC cell, it is usually attached to a fixture, and the test is performed by having the probes of the fixture contact the positive and negative electrodes (i.e., the main grid on the back side of the cell) of the cell.

[0003] However, in actual testing, the potential measured by the multiple voltage probes on the main grid may differ. This potential difference introduces a small internal current, interfering with the current-voltage (IV) test, i.e., the circulating current effect, and affecting the accuracy of the test results. Furthermore, since the positive and negative currents are each led out through a wire, with the connection points of the two wires located in the middle of the first and last rows of probes respectively, the current transmission distance of the main grid at the battery edge is longer than that at the middle. This results in localized bright and dark areas during the battery's electroluminescence (EL) test, affecting the test results.

[0004] Accordingly, there is a need in the field for a new battery testing device to address the aforementioned problems. Utility Model Content

[0005] In order to overcome the above-mentioned defects, this application is made to provide a battery testing device that solves or at least partially solves the technical problem of inaccurate test results when existing testing devices test BC batteries.

[0006] This application provides a battery testing device. The battery includes multiple main grids, and the battery testing device includes multiple current probes 10 and current wires connected to the current probes 10.

[0007] The current conductors include a positive current conductor 21 and a negative current conductor 22;

[0008] The forward current conductor 21 includes multiple forward current transmission conductors 211 and multiple forward current output conductors 212; the multiple forward current transmission conductors 211 are connected to the current probe 10 and form multiple contact points with one end of the multiple forward current output conductors 212.

[0009] The negative current conductor 22 includes multiple negative current transmission conductors 221 and multiple negative current output conductors 222; the multiple negative current transmission conductors 221 are connected to the current probe 10 and form multiple contact points with one end of the multiple negative current output conductors 222.

[0010] In one technical solution of the above-mentioned battery testing device, one end of the multiple forward current transmission wires 211 and the multiple forward current output wires 212 forms multiple equally spaced forward contact points 23.

[0011] The multiple negative current transmission wires 221 and one end of the multiple negative current output wires 222 form multiple equally spaced negative contact points 24.

[0012] In one technical solution of the aforementioned battery testing device, the number of positive contact points 23 and negative contact points 24 is the same; and...

[0013] The positions of the positive contact point 23 and the negative contact point 24 are symmetrical.

[0014] In one technical solution of the above-mentioned battery testing device, the other ends of the multiple positive current output wires 212 are connected to form a positive current output main wire 213;

[0015] The other ends of the multiple negative current transmission wires 221 are connected to form a negative current output main wire 223.

[0016] In one technical solution of the aforementioned battery testing device, the battery testing device further includes multiple voltage probes 30; and,

[0017] Voltage wire connected to the voltage probe 30.

[0018] In one technical solution of the above-mentioned battery testing device, the multiple voltage probes 30 are distributed at equal intervals;

[0019] Each of the voltage probes 30 is connected in series with a resistor 31.

[0020] In one technical solution of the above-mentioned battery testing device, the resistance of the resistor 31 is 200Ω to 500Ω.

[0021] In one technical solution of the above-mentioned battery testing device, the plurality of main grids are distributed on the first surface of the battery;

[0022] The multiple current probes 10 correspond to the multiple main grids, and the multiple current probes 10 are used to acquire the current signal of the battery;

[0023] The multiple voltage probes 30 correspond to at least a portion of the main grid, and the multiple voltage probes 30 are used to acquire the voltage signal of the battery.

[0024] In one technical solution of the above-mentioned battery testing device, the battery testing device further includes testing equipment;

[0025] The positive current output main wire 213 and the negative current output main wire 223 are respectively connected to the test equipment;

[0026] The positive current conductor 21 and the negative current conductor 22 are used to transmit the current signal to the test equipment.

[0027] In one technical solution of the above-mentioned battery testing device, the voltage conductor includes a positive voltage conductor 41 and a negative voltage conductor 42;

[0028] One end of the positive voltage conductor 41 and the negative voltage conductor 42 are connected to the plurality of voltage probes 30, and the other end of the positive voltage conductor 41 and the negative voltage conductor 42 are respectively connected to the test equipment;

[0029] The positive voltage conductor 41 and the negative voltage conductor 42 are used to transmit the voltage signal to the test equipment.

[0030] The above-described technical solutions of this application have at least one or more of the following features.

[0031] Beneficial effects:

[0032] In the technical solution of this application, the battery includes multiple main grids, and the battery testing device includes multiple current probes 10 and current wires connected to the current probes 10. The current wires include positive current wires 21 and negative current wires 22. The positive current wires 21 include multiple positive current transmission wires 211 and multiple positive current output wires 212. The multiple positive current transmission wires 211 are connected to the current probes 10 and form multiple contact points with one end of the multiple positive current output wires 212. The negative current wires 22 include multiple negative current transmission wires 221 and multiple negative current output wires 222. The multiple negative current transmission wires 221 are connected to the current probes 10 and form multiple contact points with one end of the multiple negative current output wires 222. Through the above implementation, the current transmission wires can form multiple contact points with the current output wires, allowing the main grids at the battery edge and the main grids in the middle to transmit current through different contact points, avoiding localized bright / dark areas during battery testing and making the test results more accurate.

[0033] Furthermore, the battery testing device also includes multiple voltage probes and voltage wires connected to the voltage probes, and each voltage probe is connected in series with a resistor, so that the weak internal current caused by the circulating current effect cannot be transmitted, making the IV test more accurate. Attached Figure Description

[0034] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Wherein:

[0035] Figure 1 This is a top view of an existing test fixture;

[0036] Figure 2 This is an internal wiring diagram of an existing test fixture;

[0037] Figure 3 This is a schematic diagram of the internal wiring of a battery testing device according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the internal wiring of a battery testing apparatus according to another embodiment of this application;

[0039] Figure 5 This is a partial enlarged view of a battery testing apparatus according to an embodiment of this application.

[0040] List of reference numerals in the attached diagram:

[0041] 10: Current probe; 21: Positive current lead; 22: Negative current lead; 211: Positive current transmission lead; 212: Positive current output lead; 213: Positive current output main lead; 221: Negative current transmission lead; 222: Negative current output lead; 223: Negative current output main lead; 23: Positive contact point; 24: Negative contact point; 30: Voltage probe; 31: Resistance; 41: Positive voltage lead; 42: Negative voltage lead. Detailed Implementation

[0042] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0043] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in the description of this application, "a plurality of" refers to at least two.

[0044] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Here we will first explain some of the terms used in this application.

[0046] IV testing, or current-voltage characteristic curve testing, is a method to evaluate key parameters such as conversion efficiency and power output of photovoltaic cells by measuring their current-voltage (IV) characteristic curves under different light and temperature conditions. It is crucial for understanding the performance characteristics of photovoltaic cells and provides important reference for the design, optimization, and performance monitoring of photovoltaic systems.

[0047] EL testing: also known as electroluminescence detection, involves applying voltage to the back surface of a photovoltaic cell module to make it emit light, thereby detecting defects, cracks, hot spots, and other problems in the photovoltaic cell module, and thus assessing the quality and reliability of the cell.

[0048] As described in the background section, a BC (Bright Corner) cell is a photovoltaic cell in which both the positive and negative electrodes are arranged on the back surface. An interdigitated back contact (IBC) cell is a BC cell with a front-side cover of a double-layer anti-reflection passivation film of SiNx and SiOx, and no metal grid lines; the P+ and N+ emitters, back field, and corresponding positive and negative electrodes are all arranged on the back surface of the cell. As a platform technology, IBC cells exhibit strong compatibility and can be paired with various cell technologies such as PERC, TOPCon, and HJT to form BC cells such as PERC-BC cells, TOPCon-BC cells, and HBC cells. IBC cells are considered the next generation of photovoltaic cell technology after PERC and TOPCon technologies, and with their technological advantages, they have broad development prospects.

[0049] The positive and negative electrodes of an IBC battery are arranged at equal intervals on the back surface of the battery. During testing, they are typically attached to a fixture, directly above the probes. The probes of the test fixture are pushed upwards from the bottom to contact the positive and negative electrodes (i.e., the main grids) on the back surface of the battery for testing. The probe distribution of the test fixture corresponds to the main grids of the battery, with a certain number of current and voltage probes evenly distributed at the position of each main grid.

[0050] See appendix Figure 1 and attached Figure 2 , Figure 1 This is a top view of an existing test fixture. Figure 2 This is an internal wiring diagram of an existing test fixture. (Example) Figures 1-2 As shown, the entire fixture has multiple current probes and eight voltage probes evenly spaced. The eight voltage probes are distributed across four main grids, with two voltage probes on each main grid. The four output buses—positive current conductor I+, negative current conductor I-, positive voltage conductor V+, and negative voltage conductor V-—are each led out from a single conductor. By connecting external testing equipment, the characteristics of the IBC battery can be tested.

[0051] However, in actual testing, the potential measured by the multiple voltage probes on the main grid may differ. For example, one voltage probe on the main grid may measure a voltage of 750mV, while another may measure a voltage of 730mV. There is a potential difference of 20mV between the two points. This potential difference will bring a small internal current, which will interfere with the IV test, i.e., the circulating current effect, thus affecting the accuracy of the test results.

[0052] Furthermore, the positive and negative currents are each led out through a wire, and the connection points of the two wires are located in the middle of the first and last rows of probes, respectively. This causes the current transmission distance of the main grid at the edge of the battery to be longer than that of the main grid at the middle position, which in turn causes local brightness and darkness during EL testing and affects the test results.

[0053] To address the aforementioned issues, this application provides a battery testing device for use with BC batteries. The BC battery includes multiple main grids distributed on the first surface of the battery, i.e., the backlight surface.

[0054] Specifically, see the appendix. Figure 3 , Figure 3 This is a schematic diagram of the internal wiring of a battery testing device according to an embodiment of this application.

[0055] like Figure 3As shown, the battery testing device includes multiple current probes 10 and current wires connected to the current probes 10. The multiple current probes 10 correspond to multiple main grids on the back surface of the battery, and are used to acquire the battery's current signal. The current wires include a positive current wire 21 and a negative current wire 22.

[0056] Furthermore, the forward current conductor 21 includes multiple forward current transmission conductors 211 and multiple forward current output conductors 212; the multiple forward current transmission conductors 211 are connected to multiple current probes 10 and form multiple contact points with one end of the multiple forward current output conductors 212.

[0057] Among them, the multiple contact points formed by one end of the multiple forward current transmission wires 211 and the multiple forward current output wires 212 are multiple equally spaced forward contact points 23.

[0058] The negative current conductor 22 includes multiple negative current transmission conductors 221 and multiple negative current output conductors 222; the multiple negative current transmission conductors 221 are connected to multiple current probes 10 and form multiple contact points with one end of the multiple negative current output conductors 222.

[0059] Among them, the multiple contact points formed by one end of the multiple negative current transmission wires 221 and the multiple negative current output wires 222 are multiple equally spaced negative contact points 24.

[0060] Furthermore, the number of positive contact points 23 and negative contact points 24 are the same; and the positions of positive contact points 23 and negative contact points 24 are symmetrical.

[0061] Specifically, such as Figure 3 As shown, the positive current conductor 21 includes multiple positive current transmission conductors 211 and three positive current output conductors 212. The multiple positive current transmission conductors 211 are connected to multiple current probes 10 and form three equally spaced positive contact points 23 with the three positive current output conductors 212. The negative current conductor 22 includes multiple negative current transmission conductors 221 and three negative current output conductors 222. The multiple negative current transmission conductors 221 are connected to multiple current probes 10 and form three equally spaced negative contact points 24 with the three negative current output conductors 222.

[0062] It should be pointed out that, Figure 3The number of positive current transmission wires 211, negative current transmission wires 221, positive current output wires 212, and negative current output wires 222, as well as the positions of positive contact points 23 and negative contact points 24 shown, are merely illustrative examples. In practical applications, those skilled in the art can, according to the specific circumstances of the battery, set multiple positive current transmission wires, negative current transmission wires, and at least two positive current output wires and negative current output wires, and set the positions of positive and negative contact points according to the number of positive and negative current output wires, as long as the number of positive and negative contact points is the same and their positions are symmetrical; no limitation is made here.

[0063] Furthermore, the other ends of the multiple positive current output wires 212 are connected to form a positive current output main wire 213; the other ends of the multiple negative current output wires 222 are connected to form a negative current output main wire 223.

[0064] In some embodiments, the battery testing apparatus also includes testing equipment.

[0065] Furthermore, the positive current output main wire 213 and the negative current output main wire 223 are respectively connected to the test equipment. The positive current output main wire 213 and the negative current output main wire 223 are used to transmit the current signal to the test equipment.

[0066] The testing equipment can be any device used to test the characteristics of BC batteries, such as an IV test simulator or an EL test simulator; there are no restrictions here.

[0067] Specifically, such as Figure 3 As shown, multiple current probes in 10 rows correspond to multiple main grids and are used to acquire the battery's current signals, including positive and negative current signals.

[0068] Multiple forward current transmission wires 211 are connected to the current probe 10 and form three forward contact points 23 with one end of three forward current output wires 212. The forward current signal is transmitted to the three forward current output wires 212 through the three forward contact points 23. The other ends of the three forward current output wires 212 are connected to form a forward current output main wire 213, which is connected to the test equipment to transmit the forward current signal to the test equipment.

[0069] Multiple negative current transmission wires 221 are connected to the current probe 10 and form three negative contact points 24 with one end of three negative current output wires 222. The negative current signal is transmitted to the three negative current output wires 222 through the three negative contact points 24. The other ends of the three negative current output wires 222 are connected to form a negative current output main wire 223, which is connected to the test equipment to transmit the negative current signal to the test equipment.

[0070] pass Figure 3 The battery testing device shown has a current transmission wire that can transmit positive and negative current signals to the current output wire through multiple equally spaced contact points. This makes the current transmission distance of the main grid at the edge of the battery equal to the current transmission distance of the main grid at the middle position, avoiding the problem of local brightness and darkness during the test and making the EL test results more accurate.

[0071] Further, see appendix. Figure 4 , Figure 4 This is a schematic diagram of the internal wiring of a battery testing apparatus according to another embodiment of this application.

[0072] like Figure 4 As shown, the battery testing device also includes multiple voltage probes 30, which correspond to at least a portion of the main grid on the back surface of the battery, and are used to acquire the voltage signal of the battery.

[0073] Furthermore, multiple voltage probes 30 are distributed at equal intervals, and each voltage probe 30 is connected in series with a resistor 31.

[0074] See appendix Figure 5 , Figure 5 This is a partial enlarged view of a battery testing apparatus according to an embodiment of this application. Figure 5 As shown, is Figure 4 A partial enlarged view of the box containing the medium voltage probe 30 and resistor 31.

[0075] Specifically, each voltage probe 30 is connected in series with a resistor 31, which can eliminate the weak internal current caused by the circulating current effect. The resistance of the resistor 31 can be between 200Ω and 500Ω.

[0076] Furthermore, the battery testing device also includes voltage wires connected to multiple voltage probes 30, including a positive voltage wire 41 and a negative voltage wire 42. One end of the positive voltage wire 41 and the negative voltage wire 42 is connected to the multiple voltage probes 30, and the other end of the positive voltage wire 41 and the negative voltage wire 42 are respectively connected to the testing equipment for transmitting voltage signals to the testing equipment.

[0077] Specifically, such as Figure 4As shown, the battery testing device includes eight voltage probes 30 evenly distributed, which correspond to four main grids. Two voltage probes 30 are distributed on each main grid to obtain the battery voltage signal, including positive voltage current signal and negative voltage signal.

[0078] Four of the eight voltage probes 30 are connected to one end of the positive voltage wire 41 to transmit the collected positive voltage signal to the positive voltage wire 41; the other four voltage probes 30 are connected to one end of the negative voltage wire 42 to transmit the collected negative voltage signal to the negative voltage wire 42. The other ends of the positive voltage wire 41 and the negative voltage wire 42 are connected to the test equipment to transmit the positive voltage signal and the negative voltage signal to the test equipment.

[0079] It should be pointed out that, Figure 4 The number and position of the voltage probes 30 shown are merely illustrative examples. In practical applications, those skilled in the art can set the number and position of the voltage probes according to the specific conditions of the battery; no limitation is made here.

[0080] pass Figure 4 The battery testing device shown has a resistor connected in series with each voltage probe, which prevents the weak internal current caused by the circulating current effect from being transmitted, thus making the IV test more accurate.

[0081] The above is a further description of the battery testing device provided in this application.

[0082] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0083] The technical solution of this application has been described above with reference to one embodiment shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A battery testing device, characterized in that, The battery includes multiple main grids, and the battery testing device includes multiple current probes (10) and current wires connected to the current probes (10); The current conductors include a positive current conductor (21) and a negative current conductor (22); The forward current conductor (21) includes multiple forward current transmission conductors (211) and multiple forward current output conductors (212); the multiple forward current transmission conductors (211) are connected to the current probe (10) and form multiple contact points with one end of the multiple forward current output conductors (212); The negative current conductor (22) includes multiple negative current transmission conductors (221) and multiple negative current output conductors (222); the multiple negative current transmission conductors (221) are connected to the current probe (10) and form multiple contact points with one end of the multiple negative current output conductors (222).

2. The battery testing apparatus according to claim 1, characterized in that, The multiple positive current transmission wires (211) and the multiple positive current output wires (212) form multiple equally spaced positive contact points (23) at one end; The multiple negative current transmission wires (221) and one end of the multiple negative current output wires (222) form multiple equally spaced negative contact points (24).

3. The battery testing apparatus according to claim 2, characterized in that, The number of positive contact points (23) and negative contact points (24) is the same; and, The positive contact point (23) and the negative contact point (24) are symmetrical in position.

4. The battery testing apparatus according to claim 1, characterized in that, The battery testing device also includes multiple voltage probes (30); and, Voltage wire connected to the voltage probe (30).

5. The battery testing apparatus according to claim 4, characterized in that, The multiple voltage probes (30) are evenly spaced; Each of the voltage probes (30) is connected in series with a resistor (31).

6. The battery testing apparatus according to claim 5, characterized in that, The resistance of the resistor (31) is between 200Ω and 500Ω.

7. The battery testing apparatus according to claim 4, characterized in that, The plurality of main grids are distributed on the first surface of the battery; The multiple current probes (10) correspond to the multiple main grids, and the multiple current probes (10) are used to acquire the current signal of the battery; The multiple voltage probes (30) correspond to at least a portion of the main gate, and the multiple voltage probes (30) are used to acquire the voltage signal of the battery.

8. The battery testing apparatus according to claim 4, characterized in that, The other ends of the multiple positive current output wires (212) are connected to form a positive current output main wire (213); The other ends of the multiple negative current transmission wires (221) are connected to form a negative current output main wire (223).

9. The battery testing apparatus according to claim 8, characterized in that, The battery testing device also includes testing equipment; The positive current output main conductor (213) and the negative current output main conductor (223) are respectively connected to the test equipment; The positive current conductor (21) and the negative current conductor (22) are used to transmit the current signal to the test equipment.

10. The battery testing apparatus according to claim 9, characterized in that, The voltage conductors include a positive voltage conductor (41) and a negative voltage conductor (42); One end of the positive voltage conductor (41) and the negative voltage conductor (42) are connected to the plurality of voltage probes (30), and the other end of the positive voltage conductor (41) and the negative voltage conductor (42) are respectively connected to the test equipment; The positive voltage conductor (41) and the negative voltage conductor (42) are used to transmit the voltage signal to the test equipment.

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