A weak light testing method and testing system for laminated battery components

Abstract

The present invention discloses a weak light test method and test system for a laminated battery assembly. The weak light test method for a laminated battery assembly comprises: obtaining a weak light ratio mapping relationship between a battery cell and a laminated battery assembly; determining the parallel resistance of the laminated battery assembly to be tested; within a standard weak light current ratio range, testing the weak light ratio of a battery cell with the same resistance value as the laminated battery assembly to be tested; determining the weak light ratio of the laminated battery assembly to be tested based on the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of a battery cell with the same resistance value as the laminated battery assembly to be tested. The technical solution provided by the embodiment of the present invention simplifies the weak light test process of the laminated battery assembly.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of semiconductor testing technology, and in particular to a weak-light testing method and testing system for a laminated battery assembly. Background Art

[0002] The ability of solar cells to convert light energy into electrical energy under weak light intensity is called the weak light performance of solar cells.

[0003] In actual use, a laminated battery assembly composed of multiple battery cells is used to perform a photovoltaic power generation process. Currently, in the process of testing solar cells under weak light conditions, it is relatively cumbersome to obtain the weak light performance test method of a large number of laminated battery assemblies to be tested. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a weak-light testing method for a laminated battery assembly, which simplifies the weak-light testing process of the laminated battery assembly.

[0005] In a first aspect, an embodiment of the present invention provides a weak light testing method for a laminated battery assembly, comprising:

[0006] Obtain the weak light ratio mapping relationship between the battery cell and the laminated battery assembly;

[0007] Determine the parallel resistance of the laminated battery assembly to be tested;

[0008] Within the standard weak light current ratio range, testing the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested;

[0009] The weak light ratio of the laminated battery assembly to be measured is determined according to the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be measured.

[0010] Optionally, the weak light ratio of the cell is a ratio of the luminous efficiency under current light intensity to the luminous efficiency under standard light intensity.

[0011] Optionally, the current ratio of the battery cell is a ratio of the short-circuit current under the current light intensity to the short-circuit current under the standard light intensity.

[0012] Optionally, obtaining the weak light ratio mapping relationship between the battery cell and the laminated battery assembly includes:

[0013] Obtain the mapping relationship between the weak light ratio and current ratio of the cell under different light intensities;

[0014] Determine a standard weak light current ratio corresponding to the standard weak light ratio according to a mapping relationship between the standard weak light ratio and the weak light ratio and current ratio of the same battery cell;

[0015] Within the standard weak light current ratio range, test the weak light ratio corresponding to different resistance ranges of the battery cell;

[0016] Within the standard weak light current ratio range, the weak light ratio corresponding to different resistance value intervals of the laminated battery module is tested;

[0017] According to the weak light ratios corresponding to different resistance ranges of the battery cell and the weak light ratios corresponding to different resistance ranges of the laminated battery assembly, the weak light ratio mapping relationship between the battery cell and the laminated battery assembly with the same resistance value is determined.

[0018] Optionally, obtaining the mapping relationship between the weak light ratio and the current ratio of the battery cell under different light intensities includes:

[0019] Test the weak light ratio and current ratio of the same cell under different light intensities;

[0020] According to the weak light ratio and current ratio of the same cell under different light intensities, a mapping relationship between the weak light ratio and the current ratio of the same cell under different light intensities is determined.

[0021] Optionally, the width of the resistance interval corresponding to the battery cell is smaller than the width of the resistance interval corresponding to the laminated battery assembly, and the number of resistance intervals corresponding to the battery cell is smaller than the number of resistance intervals corresponding to the laminated battery assembly.

[0022] Optionally, the value range of the standard weak photocurrent ratio is greater than or equal to 4.9 and less than or equal to 5.1.

[0023] Optionally, within the standard weak light illumination intensity range, the variation trend of the weak light ratio of the cell with the resistance value is the same as the variation trend of the weak light ratio of the laminated cell assembly with the resistance value.

[0024] Optionally, different light intensities can be obtained by adjusting the light intensity output power of the standard solar simulation light source.

[0025] In a second aspect, an embodiment of the present invention provides a weak-light testing system for a laminated battery assembly, including any of the weak-light testing methods for a laminated battery assembly described in the first aspect.

[0026] The technical solution provided in this embodiment determines the weak light ratio of the laminated battery assembly to be tested based on the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested. Compared with the prior art of directly testing the weak light ratio of the laminated battery assembly to be tested, in the face of a large number of laminated batteries to be tested, there is no need to directly test each laminated battery assembly to be tested, which avoids the unsafe factor that the laminated battery assembly to be tested may be damaged during the testing process and simplifies the testing process of the weak light ratio of the laminated battery assembly to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 A flowchart of a weak light testing method for a laminated battery assembly provided by an embodiment of the present invention;

[0029] Figure 2 A weak light ratio mapping relationship diagram of a battery cell and a laminated battery assembly provided by an embodiment of the present invention;

[0030] Figure 3 A flow chart of another weak light testing method for a laminated battery assembly provided by an embodiment of the present invention;

[0031] Figure 4 A flow chart of another method for weak light testing of a laminated battery assembly provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram showing the change of the current ratio of a battery cell with the light intensity output power provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the variation of the weak light ratio of a battery cell with the current ratio provided by an embodiment of the present invention;

[0034] Figure 7 A schematic diagram showing the variation of the weak light ratio of a battery cell with the resistance value provided by an embodiment of the present invention;

[0035] Figure 8 A schematic diagram showing the variation of the weak light ratio of a laminated battery assembly with the resistance value provided by an embodiment of the present invention;

[0036] Fig. 9 A schematic structural diagram of an electrical performance testing system for a battery cell or a laminated battery assembly provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] As described in the background technology above, the prior art method for testing the weak light performance of laminated battery assemblies is relatively cumbersome. The reason is that in order to obtain the weak light performance of a large number of laminated assemblies to be tested in the prior art, it is necessary to directly test each laminated battery assembly to be tested, which is a relatively cumbersome process.

[0039] In view of the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0040] It should be noted that the cell in this embodiment refers to a solar cell, and the laminated cell assembly refers to a laminated voltage assembly made of solar cells. Figure 1 A flow chart of a weak light testing method for a laminated battery assembly provided in an embodiment of the present invention. Figure 2 This is a diagram showing the relationship between the weak light ratio of the battery cell and the laminated battery assembly provided by the embodiment of the present invention. Figure 1 The weak light testing method of the laminated battery assembly comprises the following steps:

[0041] Step 110: Obtain the weak light ratio mapping relationship between the battery cell and the laminated battery assembly.

[0042] Optionally, the low-light ratios of the battery cell and the laminated battery assembly are the ratios of the luminous efficiency under the current light intensity and the luminous efficiency under the standard light intensity. The definition of luminous efficiency is explained below using the battery cell as an example. Luminous efficiency refers to the ratio of the solar energy radiated to the surface of the battery cell and converted into electrical energy under a certain light intensity to the solar energy radiated to the surface of the battery cell. Specifically, in this embodiment, simulated sunlight of different light intensities is obtained by adjusting the light intensity output power of the standard solar simulation light source. The standard light intensity is the light intensity corresponding to the solar simulation light source under the standard light intensity output power, and the value is 1000W / M 2 In this embodiment, the weak light intensity is less than the standard light intensity. Under different resistance values, the weak light ratio of the battery cell and the laminated battery assembly has the same trend of change with the resistance value under the same light intensity. According to the above rules, the weak light ratio mapping relationship of the battery cell and the laminated battery assembly under the same light intensity can be obtained.

[0043] Step 120: Determine the parallel resistance of the laminated battery assembly to be tested.

[0044] Specifically, the parallel resistance of the laminated battery assembly to be tested can be measured by the battery testing system. The laminated battery assembly to be tested is made of a single battery.

[0045] Step 130 : within the standard weak light current ratio range, test the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested.

[0046] The cell absorbs the simulated sunlight radiated to the surface of the cell and converts it into electrical energy. In the actual test process, due to partial shading caused by the surface structure of the cell or the placement of the cell, the simulated sunlight cannot be incident vertically on the surface of the cell, resulting in the light intensity radiated on the surface of the cell and the light intensity actually received by the cell not necessarily being equal. By adjusting the standard solar simulated light source to output the same light intensity, it cannot be guaranteed that the light intensity actually absorbed by the cell is the same. Specifically, the cell can convert the energy of the received simulated sunlight into electrical energy under a certain light intensity. The short-circuit current (Isc) of the cell refers to the current flowing through the two ends of the solar cell when it is placed under the irradiation of a light source of a certain light intensity and the output end is short-circuited. The current ratio of the battery is the ratio of the short-circuit current (Isc1) under the current light intensity to the short-circuit current (Isc) under the standard light intensity. Therefore, the amount of electrical energy converted after the solar energy received by the cell and the amount of light intensity actually received by the cell can be characterized according to the size of the current ratio of the cell. The standard weak light current ratio is the current ratio of the battery under the standard weak light illumination intensity. Therefore, in order to ensure that the battery cell and the laminated battery assembly are tested under the same actual light intensity, in this embodiment, the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested is tested within the standard weak light current ratio range.

[0047] Step 140: Determine the weak light ratio of the laminated battery assembly to be tested according to the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested.

[0048] Specifically, in Figure 2 In the standard weak light current ratio range, the weak light ratio of the cell and laminated battery module with the same resistance value is in direct proportion. According to the weak light ratio of the cell with the same resistance value of the laminated battery module to be tested, Figure 2 The weak light ratio mapping relationship diagram of the battery cell and the laminated battery assembly shown can be used to obtain the weak light ratio of the laminated battery assembly to be tested.

[0049] The technical solution provided in this embodiment determines the weak light ratio of the laminated battery assembly to be tested based on the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested. Compared with the prior art of directly testing the weak light ratio of the laminated battery assembly to be tested, in the face of a large number of laminated batteries to be tested, there is no need to directly test each laminated battery assembly to be tested, which avoids the unsafe factor that the laminated battery assembly to be tested may be damaged during the testing process and simplifies the testing process of the weak light ratio of the laminated battery assembly to be tested.

[0050] Figure 3 A flow chart of another method for weak light testing of a laminated battery assembly provided in an embodiment of the present invention. Figure 4 A flowchart of another method for testing weak light of a laminated battery assembly provided by an embodiment of the present invention. Figure 3 Before step 110 of obtaining the weak light ratio mapping relationship between the battery cell and the laminated battery assembly, the following steps are included:

[0051] Step 1101: Obtain a mapping relationship between a weak light ratio and a current ratio of a cell under different light intensities.

[0052] Alternatively, see Figure 4 Step 1101 obtains the mapping relationship between the weak light ratio and the current ratio of the battery cell under different light intensities, including:

[0053] Step 11011, test the weak light ratio and current ratio of the same cell under different light intensities.

[0054] Specifically, the light intensity output power of the standard solar simulation light source is adjusted to obtain different light intensities. For the same cell, the difference between the light intensity radiated by the cell on the cell surface and the light intensity actually received by the cell can be ignored. By controlling the light intensity parameter, the weak light ratio and current ratio of the cell under different light intensities can be obtained.

[0055] For example, Figure 5 It should be noted that this embodiment does not show a schematic diagram of the change of the weak light ratio of the same cell under different light intensities with the light intensity output power of the solar simulated light source.

[0056] Step 11012: Determine a mapping relationship between the weak light ratio and the current ratio of the same cell under different light intensities according to the weak light ratio and the current ratio of the same cell under different light intensities.

[0057] Specifically, according to the weak light ratio and current ratio of the same cell under different light intensities, a mapping relationship between the current ratio of the cell and the light intensity (light output power) and a mapping relationship between the weak light ratio of the cell and the light intensity (light output power) can be established. According to the mapping relationship between the current ratio of the cell and the light intensity (light output power) and the mapping relationship between the weak light ratio of the cell and the light intensity (light output power), the mapping relationship between the weak light ratio and the current ratio of the same cell under different light intensities can be obtained. Figure 6 The schematic diagram exemplarily shows the mapping relationship between the weak light ratio and the current ratio of the same cell under different light intensities. Figure 6 In the figure, the horizontal coordinate of each coordinate point is the current ratio of the battery cell, and the vertical coordinate of the coordinate point is the weak light ratio of the same battery cell under the same light intensity.

[0058] Step 1102: Determine a standard weak light current ratio corresponding to the standard weak light ratio according to the mapping relationship between the standard weak light ratio and the weak light ratio and current ratio of the same battery cell.

[0059] The standard weak light ratio is the ratio of the battery's weak light intensity under the standard weak light intensity. The standard weak light ratio can be a value set by personnel in this field. The standard weak light current ratio is the ratio of the battery's short-circuit current under the standard weak light intensity to the short-circuit current under the standard light intensity. For details, please refer to Figure 6 The weak light ratio of the same cell changes linearly with the current ratio. The standard weak light current ratio corresponding to the standard weak light ratio can be determined based on the mapping relationship between the standard weak light ratio and the weak light ratio and current ratio of the same cell.

[0060] Step 1103: within the standard weak light current ratio range, test the weak light ratio corresponding to different resistance ranges of the battery cell.

[0061] In the standard weak light current ratio range, that is, the light intensity actually absorbed by the cell is the standard weak light intensity, the weak light ratio corresponding to different resistance ranges of the cell is tested. For example, see Figure 7 ,With the increase of resistance value, the weak light ratio corresponding to the battery cell first increases in direct proportion to the increase of resistance value, and when it increases to a certain value, the weak light ratio corresponding to the battery cell increases with the increase of resistance value, and the value of the weak light ratio remains basically unchanged.

[0062] Step 1104: within the standard weak light current ratio range, test the weak light ratio corresponding to different resistance ranges of the laminated battery assembly.

[0063] Optionally, a suitable resistance range of the laminated battery assembly is selected to ensure that within the standard weak light illumination intensity range, the variation trend of the weak light ratio of the battery cell with the resistance value is the same as the variation trend of the weak light ratio of the laminated battery assembly with the resistance value. Figure 8 ,With the increase of resistance value, the weak light ratio corresponding to the laminated battery assembly first increases in direct proportion to the increase of resistance value, and increases to a certain value. The weak light ratio corresponding to the laminated battery assembly increases with the increase of resistance value, and the value of the weak light ratio remains basically unchanged.

[0064] Optionally, the width of the resistance interval corresponding to the battery cell is smaller than the width of the resistance interval corresponding to the laminated battery assembly, and the number of resistance intervals corresponding to the battery cell is smaller than the number of resistance intervals corresponding to the laminated battery assembly.

[0065] For example, see Figure 7 , the resistance range width of the battery cell is 5 ohms, see Figure 8, the resistance range corresponding to the laminated battery assembly is less than 30 ohms, greater than or equal to 30 ohms and less than 50 ohms, greater than or equal to 50 ohms and less than 120 ohms, and greater than 120 ohms. The resistance range width corresponding to the laminated battery assembly includes 30 ohms, 20 ohms and 70 ohms. Specifically, since the resistance range of the laminated battery assembly is relatively wide and the value is greater than the resistance of the battery cell, as long as the trend of the change of the weak light ratio of the battery cell with the resistance value within the standard weak light intensity range is ensured to be the same as the trend of the change of the weak light ratio of the laminated battery assembly with the resistance value, the width of the resistance interval corresponding to the battery cell of the laminated battery assembly is smaller than the width of the resistance interval corresponding to the laminated battery assembly, and the number of resistance intervals corresponding to the battery cell is smaller than the number of resistance intervals corresponding to the laminated battery assembly.

[0066] Step 1105 , determine the weak-light ratio mapping relationship between the battery cells and the laminated battery assemblies with the same resistance value according to the weak-light ratios corresponding to different resistance ranges of the battery cells and the weak-light ratios corresponding to different resistance ranges of the laminated battery assemblies.

[0067] Since within the standard weak light intensity range, the changing trend of the weak light ratio of the battery cell with the resistance value is the same as the changing trend of the weak light ratio of the laminated battery module with the resistance value, the weak light ratio mapping relationship of the battery cell and the laminated battery module with the same resistance value can be determined according to the above rules.

[0068] Optionally, based on the above technical solution, the value range of the standard weak photocurrent ratio is greater than or equal to 4.9 and less than or equal to 5.1.

[0069] The value of the standard weak light current ratio is too small, less than 4.9, the solar energy actually absorbed by the cell or laminated cell assembly is too little, so the value of the weak light ratio is too small, and the actual measured weak light ratio result is not accurate. The value of the standard weak light current ratio is too large, greater than 5.1, the solar energy actually absorbed by the cell or laminated cell assembly is too much, and the corresponding actual light intensity irradiated to the surface of the cell is too high, which does not meet the weak light test conditions.

[0070] It should be noted that Fig. 9 The schematic diagram of the structure of an electrical performance test system for a battery cell or a laminated battery assembly is shown. The electrical performance test system includes a battery cell 30 , a probe 40 , a battery test device 20 and a standard solar energy simulation light source 10 .

[0071] By adjusting the output power of the standard solar simulation light source 10, simulated sunlight of a preset intensity can be obtained. The probe 40 is used to make electrical contact with the cell or laminated cell assembly 30. When the cell or laminated cell assembly 30 is irradiated with simulated sunlight emitted by the standard solar simulation light source 10, photogenerated carriers are generated inside the cell or laminated cell assembly 30, and the battery testing device 20 collects the current ratio and weak light ratio of the cell or laminated cell assembly 30 through the probe 40.

[0072] An embodiment of the present invention further provides a weak-light testing system for a laminated battery assembly, including any of the weak-light testing methods for a laminated battery assembly described in the above technical solutions.

[0073] The weak-light testing system for a laminated battery assembly provided in an embodiment of the present invention adopts any of the weak-light testing methods for a laminated battery assembly described in the above technical solutions, and has the same technical effects as any of the weak-light testing methods for a laminated battery assembly described in the above technical solutions, which will not be repeated here.

[0074] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A weak light testing method for laminated battery components, characterized in that: include: Obtain the weak light ratio mapping relationship between the battery cell and the laminated battery assembly; Determine the parallel resistance of the laminated battery assembly to be tested; Within the standard weak light current ratio range, testing the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be tested; The weak light ratio of the laminated battery assembly to be measured is determined according to the weak light ratio mapping relationship between the battery cell and the laminated battery assembly and the weak light ratio of the battery cell with the same resistance value as the laminated battery assembly to be measured.

2. The weak light testing method for laminated battery assembly according to claim 1, characterized in that: The low-light ratio of the cell is the ratio of the luminous efficiency under the current light intensity to the luminous efficiency under the standard light intensity.

3. The weak light testing method for laminated battery assembly according to claim 1, characterized in that: The current ratio of the battery cell is the ratio of the short-circuit current under the current light intensity to the short-circuit current under the standard light intensity.

4. The weak light testing method for laminated battery assembly according to claim 1, characterized in that: Obtaining the low light ratio mapping relationship between the cell and the laminated cell assembly includes: Obtain the mapping relationship between the weak light ratio and current ratio of the cell under different light intensities; Determine a standard weak light current ratio corresponding to the standard weak light ratio according to a mapping relationship between the standard weak light ratio and the weak light ratio and current ratio of the same battery cell; Within the standard weak light current ratio range, test the weak light ratio corresponding to different resistance ranges of the battery cell; Within the standard weak light current ratio range, the weak light ratio corresponding to different resistance value intervals of the laminated battery module is tested; According to the weak light ratios corresponding to different resistance ranges of the battery cell and the weak light ratios corresponding to different resistance ranges of the laminated battery assembly, the weak light ratio mapping relationship between the battery cell and the laminated battery assembly with the same resistance value is determined.

5. The weak light testing method for laminated battery assembly according to claim 4, characterized in that: The mapping relationship between the weak light ratio and the current ratio of the cell under different light intensities is obtained as follows: Test the weak light ratio and current ratio of the same cell under different light intensities; According to the weak light ratio and current ratio of the same cell under different light intensities, a mapping relationship between the weak light ratio and the current ratio of the same cell under different light intensities is determined.

6. The weak light testing method for laminated battery assembly according to claim 4, characterized in that: The width of the resistance interval corresponding to the battery cell is smaller than the width of the resistance interval corresponding to the laminated battery assembly, and the number of resistance intervals corresponding to the battery cell is smaller than the number of resistance intervals corresponding to the laminated battery assembly.

7. The weak light testing method for laminated battery assembly according to claim 4, characterized in that: The value range of the standard weak photocurrent ratio is greater than or equal to 4.9 and less than or equal to 5.

1.

8. The weak light testing method for laminated battery assembly according to claim 4, characterized in that: Within the standard weak light illumination intensity range, the variation trend of the weak light ratio of the cell with the resistance value is the same as the variation trend of the weak light ratio of the laminated cell assembly with the resistance value.

9. The weak light testing method for laminated battery assembly according to any one of claims 1 to 8, characterized in that: Different light intensities can be obtained by adjusting the light intensity output power of the standard solar simulation light source.

10. A weak light testing system for laminated battery components, characterized in that: A weak light testing method for a laminated battery assembly comprising any one of claims 1-9.

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