Battery piece detection assembly
By designing grooves and conductive contacts on the test board that match the main grid, the problem of inaccurate testing in cell testing was solved, resulting in more efficient and accurate test results, and reducing production costs and time losses.
Patent Information
- Application Number
- CN202520003855.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-02
AI Technical Summary
During the cell testing process, the inconsistent number and spacing of the main grids in the new pattern cause the probes to not overlap completely, resulting in inaccurate test results and wasted time and resources.
A battery cell testing assembly was designed. The testing board has a groove that matches the main grid. A conductive element is installed in the groove. The main grid is inserted into the groove and contacts the conductive element to perform current-voltage and electroluminescence tests.
This improved the accuracy and efficiency of test results, avoided prolonged downtime for adjustments, and reduced production costs and time losses.
Smart Images
Figure CN223786422U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of solar cell technology, and in particular to a cell detection assembly. Background Technology
[0002] In the field of solar cell technology, innovation mainly focuses on improving cell conversion efficiency, reducing costs, enhancing environmental adaptability, and improving sustainability. N-type cell technologies, such as passivated contact cells and heterojunction cells, are favored by the market due to their high efficiency and low light-induced degradation characteristics, and are rapidly increasing their market share. Passivated contact cells represent a major market in the photovoltaic industry; therefore, there are numerous directions for the development, efficiency improvement, and cost reduction of passivated contact cells, resulting in a constant stream of new technologies and products. The emergence of technologies such as OBB, steel plates, and stacked grids represents several major innovative breakthroughs in the history of passivated contact cell development, and the commonality among these new technologies is that they optimize or even revolutionize the traditional cell pattern design.
[0003] When performing current-voltage characteristic testing (IV testing) and electroluminescence testing (EL testing) on solar cells, the patterns of 0BB (no main grid), steel plate (with broken grid lines), and stacked grid (extremely small unit grid lines) all present inconveniences on traditional probe array testing machines. The number of main grids in the new pattern is different, the spacing of the printed main grids is different, or the overall width of the main grid is printed too narrow. All of these will cause the probe to not completely overlap with the main grid, resulting in inaccurate test results. Adjusting the probe on the equipment will delay and waste production line time, manpower, and resources. Utility Model Content
[0004] This application discloses a battery cell testing component. The shape of the first groove corresponds to the shape of the main grid. The main grid enters the first groove and contacts the first conductive element, making the contact between the main grid and the first conductive element more precise, the test results more accurate and more efficient.
[0005] To achieve the above objectives, this application discloses a battery cell detection assembly for detecting battery cells, wherein the surface of the battery cell is provided with a main grid, and the battery cell detection assembly includes:
[0006] The detection plate is made of transparent material and includes a first surface. A first groove is provided on the first surface. The size of the first groove matches the size of the main grid so that when the detection plate presses the battery cell, the main grid can be inserted into the first groove. A first conductive element is provided in the first groove. When the main grid is inserted into the first groove, the first conductive element contacts the main grid.
[0007] As an optional implementation, the first conductive element is disposed at the bottom of the first groove, and the distance from the bottom of the first groove to the first surface is less than or equal to the height of the main gate.
[0008] As an alternative implementation, the width and length of the first groove are matched with the width and length of the main gate.
[0009] As an optional implementation, the detection plate further includes a second surface disposed opposite to the first surface. The second surface is provided with a second groove, and a second conductive element is provided in the second groove. The distance from the bottom of the first groove to the first surface is greater than the distance from the bottom of the second groove to the second surface. The front and back sides of the battery cell are provided with main grids. The first surface is used to press the front side of the battery cell, and the second surface is used to press the back side of the battery cell.
[0010] As an optional implementation, the distance from the bottom of the first groove to the first surface is 6μm-10μm, and the distance from the bottom of the second groove to the second surface is 4μm-8μm.
[0011] As an optional implementation, the detection plate is provided with a plurality of first grooves and a plurality of first conductive elements, and each of the first grooves on the detection plate can correspond one-to-one with each of the main grids.
[0012] As an optional implementation, the detection plate includes multiple detection sub-plates, each of which is provided with the first groove and the first conductive element, and the detection sub-plate is provided with a connecting portion to connect each detection sub-plate along the length direction perpendicular to the groove.
[0013] As an optional implementation, the connecting portion on one of the two adjacent detection sub-boards is a plug, and the connecting portion on the other is a socket. The plug and the socket cooperate to connect the two adjacent detection sub-boards along the length direction perpendicular to the groove.
[0014] As an optional implementation, the thickness of the detection plate is 0.3mm-1.0mm;
[0015] And / or,
[0016] The testing plate is made of acrylic sheet.
[0017] As an optional implementation, the first conductive element is made of copper.
[0018] Compared with the prior art, the beneficial effects of this application are:
[0019] The battery cell testing assembly provided in this application embodiment is used to test battery cells. The surface of the battery cell is provided with a main grid. The testing plate is made of transparent material and includes a first surface with a first groove. The size of the first groove matches the size of the main grid so that when the testing plate presses the battery cell, the main grid can be inserted into the first groove. A first conductive element is provided in the first groove. When the main grid is inserted into the first groove, the first conductive element contacts the main grid. The conductive element contacts the main grid and conducts current-voltage testing and electroluminescence testing. The main grid is inserted in the first groove and contacts the first conductive element, making the pressing more precise and convenient, resulting in more accurate test results. Moreover, it eliminates the need for long-term downtime for switching to calibrate the pressing accuracy of the main grid, avoiding production losses caused by long-term downtime and improving work efficiency. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of a battery cell testing assembly disclosed in an embodiment of this application;
[0022] Figure 2 This is a schematic diagram of a battery cell testing assembly disclosed in this application during the pressing of battery cells;
[0023] Figure 3 This application discloses another structural schematic diagram of the battery cell detection assembly during the pressing of battery cells;
[0024] Figure 4 This is a schematic diagram of another battery cell detection assembly disclosed in this application during the pressing of battery cells (including battery cells);
[0025] Figure 5 This is a schematic diagram of the structure of the detection sub-board disclosed in an embodiment of this application;
[0026] Figure 6 The embodiments disclosed in this application Figure 5 A magnified view of a portion of point A in the middle.
[0027] Explanation of reference numerals in the attached figures:
[0028] 100 - Cell testing assembly; 1 - Testing board; 1a - First surface; 1b - Second surface; 11 - First groove; 111 - First conductor; 12 - Second groove; 121 - Second conductor; 13 - Testing sub-board; 131 - Connector; 1311 - Plug; 1312 - Socket; 2 - Cell; 2a - Front side; 2b - Back side; 21 - Main grid. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0030] In this application, the terms "upper," "bottom," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0031] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0032] Furthermore, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0034] In the field of solar cell technology, innovation mainly focuses on improving cell conversion efficiency, reducing costs, enhancing environmental adaptability, and improving sustainability. N-type cell technologies, such as passivated contact cells and heterojunction cells, are favored by the market due to their high efficiency and low light-induced degradation characteristics, and are rapidly increasing their market share. Passivated contact cell technology is an advanced technology for improving solar cell efficiency. It enhances cell performance by creating a specific electric field on the cell surface to suppress carrier recombination. This technology avoids the heavy doping and direct metal / semiconductor contact found in traditional crystalline silicon solar cells, significantly reducing surface recombination and free carrier absorption, making it the mainstream development direction for high-efficiency crystalline silicon cells. Passivated contact cells represent a major market in the photovoltaic industry, resulting in numerous development directions and cost-saving efforts, with new technologies and products emerging continuously. The emergence of technologies such as 0BB (no main grid), steel plates (with grid line breaks), and stacked grids (extremely small unit grid lines) represents several major innovative breakthroughs in the history of passivated contact cell development. The commonality among these new technologies is that they optimize or even revolutionize the traditional cell pattern design.
[0035] Therefore, it is particularly important to perform current-voltage and electroluminescence (EL) detection by pressing probe arrays on both sides of the solar cell. EL detection, or current-voltage characteristic testing, is a fundamental test in solar cell performance evaluation. By measuring the current-voltage relationship of the solar cell under different illumination and temperature conditions, an EL curve can be obtained, allowing the calculation of key parameters such as short-circuit current (Isc), open-circuit voltage (Voc), maximum power point current (Impp), and voltage (Vmpp). These parameters are crucial for evaluating solar cell performance because they determine the cell's maximum output power and overall efficiency. EL detection is a non-destructive technique for detecting internal defects in solar cells. It applies voltage to the cell to excite electroluminescence within the cell, which is then captured by a special camera to form an EL image. By analyzing the EL image, micro-defects such as microcracks, black edges, microcracks, fragmentation, and poor sintering can be detected. EL detection is of great significance for improving the quality and reliability of solar cells because these defects can severely affect cell performance and lifespan.
[0036] When performing current-voltage characteristic testing and electroluminescence testing on solar cells, the patterns of 0BB (no main grid), steel plate (with broken grid lines), and stacked grid (extremely small unit grid lines) all present inconveniences on traditional probe array testing machines. The number of main grids in the new pattern is different, the spacing of the printed main grids is different, or the overall width of the main grid is printed too narrow. All of these will cause the probe to not completely overlap with the main grid, resulting in inaccurate test results. Adjusting the probe on the equipment will delay and waste production line time, manpower, and resources.
[0037] To address the aforementioned problems, the inventors further improved the battery cell detection component, designing as follows: Figure 1 The structure shown enables the first conductive element to contact and conduct electricity with the main grid, allowing for current-voltage testing and electroluminescence testing. Specifically, the test plate presses the solar cell together, and the main grid enters the first groove to contact the conductive element.
[0038] Based on this, this application discloses a battery cell testing component that makes pressing battery cells more precise and convenient, resulting in more accurate test results and avoiding production losses caused by long-term downtime, thus improving work efficiency.
[0039] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.
[0040] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of a battery cell detection assembly 100 disclosed in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the battery cell testing assembly 100 during the pressing of the battery cell 2, as disclosed in an embodiment of this application. Figure 3 This application discloses another structural schematic diagram of the battery cell detection assembly 100 pressing a battery cell 2. This application discloses a battery cell detection assembly 100 for detecting a battery cell 2. The surface of the battery cell 2 is provided with a main grid 21. The battery cell 2 detection assembly 100 includes a detection plate 1, which is made of transparent material. The detection plate 1 includes a first surface 1a, on which a first groove 11 is provided. The size of the first groove 11 matches the size of the main grid 21, so that when the detection plate 1 presses the battery cell 2, the main grid 21 can be inserted into the first groove 11. A first conductive element 111 is provided in the first groove 11. When the main grid 21 is inserted into the first groove 11, the first conductive element 111 contacts the main grid 21.
[0041] In this way, the detection plate 1 is used to press the battery cell 2 together, so that the first conductive element 111 contacts the main grid 21 and is energized to perform current-voltage testing and electroluminescence testing. The detection plate 1 can be replaced at any time according to the different patterns of the battery cell 2. By setting the first groove 11 that matches the size of the main grid 21, the precise alignment of the battery cell 2 during testing is ensured. The main grid 21 can be inserted into the first groove 11, which not only ensures good contact between the detection plate 1 and the battery cell 2, but also avoids testing errors caused by positional misalignment. The pressing is more accurate and convenient, and the work efficiency is higher. Moreover, it ensures that the main grid 21 can accurately contact the first conductive element 111. It is suitable for main grids 21 of different sizes and designs, which improves the adaptability and compatibility of the battery cell testing assembly 100. It is suitable for testing various types of battery cells 2, and there is no need to stop for a long time to switch or modify the detection probe array of the production line to calibrate the accuracy of pressing the main grid 21, thus avoiding the production loss caused by long-term downtime.
[0042] It should be noted that the detection plate 1 can use any possible conductive and transparent material to facilitate the power supply to the battery cell 2 and the observation of the internal light emission of the battery cell 2 during electroluminescence detection. This embodiment does not limit this.
[0043] As an optional implementation, the first conductive element 111 is disposed at the bottom of the first groove 11, and the distance from the bottom of the first groove 11 to the first surface 1a is less than or equal to the height of the main grid 21. This ensures that when the detection plate 1 presses the battery cell 2, the main grid 21 is engaged in the first groove 11, and the main grid 21 can make complete contact with the first conductive element 111. This makes the contact between the first conductive element 111 and the main grid 21 more stable, reduces the risk of poor contact, and thus improves the stability of the detection signal and the reliability of the detection results.
[0044] Optionally, the width and length of the first groove 11 match the width and length of the main grid 21. By ensuring that the width and length of the first groove 11 perfectly match the main grid 21, the main grid 21 can be accurately positioned during the testing process, avoiding problems such as poor contact or insufficient contact area due to size mismatch, effectively improving the accuracy and reliability of the testing. The precise size match reduces the mechanical stress on the main grid 21 during the testing process, preventing damage to the main grid 21 due to improper pressure during the testing process, protecting the structure of the main grid 21 of the battery cell 2, extending the service life of the battery cell 2, and also enabling the first conductive element 111 to quickly and accurately establish contact with the main grid 21 without additional adjustments, thereby speeding up the testing speed and improving the testing efficiency.
[0045] Understandably, the main grid 21 of the front side 2a and the back side 2b of the battery cell 2 is typically at different heights, with the main grid 21 of the front side 2a being higher than that of the back side 2b. Therefore, when combined with... Figure 4 , Figure 4 This is a schematic diagram of the structure of another battery cell testing assembly 100 when pressing a battery cell (including battery cell 2). In some optional embodiments, the testing plate 1 further includes a second surface 1b disposed opposite to the first surface 1a. The second surface 1b is provided with a second groove 12, and a second conductive element 121 is provided in the second groove 12. The distance from the bottom of the first groove 11 to the first surface 1a is greater than the distance from the bottom of the second groove 12 to the second surface 1b. The front side 2a and the back side 2b of the battery cell 2 are both provided with main grids 21. The first surface 1a is used to press the front side 2a of the battery cell 2, and the second surface 1b is used to press the back side 2b of the battery cell 2.
[0046] Thus, combined Figure 4 By providing a first groove 11 and a second groove 12 on the front and back sides of the detection plate 1 for pressing the main grid 21 of the front and back sides 2b of the battery cell 2, the main grid 21 of the front and back sides 2b of a battery cell 2 can be detected simultaneously by a detection plate 1 of the same size. The depth of the first groove 11 for pressing the front side 2a of the battery cell 2 is greater than the depth of the second groove 12 for pressing the back side 2b of the battery cell 2, so that the main grid 21 on the battery cell 2 can be better inserted into the groove and make precise contact with the conductive element, ensuring the stability of the detection signal and the consistency of the detection results, and improving the overall detection quality.
[0047] Combination Figure 3 It is understandable that when only the first surface 1a of the battery cell 2 has the first groove 11, in order for the main grid 21 of the front side 2a and the back side 2b of the battery cell 2 to be fully inserted into the first groove 11, the distance from the first groove 11 on the detection plate 1 to the first surface 1a should be at least less than or equal to the height of the main grid 21 on the back side 2b. Alternatively, two detection plates 1 with first groove 11 of different sizes can be used to press the front side 2a and the back side 2b of the battery cell 2 respectively.
[0048] In some embodiments, combined with Figure 4 The distance from the bottom of the first groove 11 to the first surface 1a is 6μm-10μm, and the distance from the bottom of the second groove 12 to the second surface 1b is 4μm-8μm. By controlling the groove depth, stable contact between the conductive element and the main grid 21 is ensured, thereby optimizing the transmission of the detection signal and improving the accuracy and stability of the detection. This helps to ensure reliable contact between the main grid 21 and the conductive element, ensuring sufficient contact area while avoiding incomplete contact between the main grid 21 and the first conductive element 111 due to excessive depth, which would affect the test results. By reasonably setting the groove depth, the cell detection assembly 100 ensures rapid and accurate contact when pressing the cell 2, reducing adjustment and detection time and improving detection efficiency.
[0049] Combination Figure 1 and Figure 2 The detection plate 1 is provided with a plurality of first grooves 11 and a plurality of first conductive elements 111, and each of the first grooves 11 on the detection plate 1 can correspond one-to-one with each of the main grids 21. This not only significantly improves the efficiency and accuracy of detection and enhances the adaptability of the battery cell detection assembly 100, but also reduces the risk of false detection and optimizes production costs and maintenance efficiency.
[0050] It is understood that the detection plate 1 can be prefabricated as a whole or as a spliced prefabricated plate, and this embodiment does not limit this.
[0051] As an optional implementation method, combined with Figure 5 , Figure 5 This is a schematic diagram of the structure of the detection sub-board disclosed in this application embodiment. The detection board 1 includes multiple detection sub-boards 13, each of which has a first groove 11 and a first conductive element 111. Each detection sub-board 13 has a connecting portion 131 to connect the detection sub-boards 13 along a length direction perpendicular to the groove. By decomposing the detection board 1 into multiple detection sub-boards 13, on the one hand, the cell detection assembly 100 can flexibly adapt to cell 2 of different sizes and layouts. The detection sub-boards 13 can be added or removed as needed, improving the flexibility and adaptability of the cell detection assembly 100. On the other hand, it allows for individual replacement or maintenance of the detection sub-boards 13, reducing the need for complete board replacement due to damage to a single component, thus lowering maintenance costs and downtime. The standardized design of the connecting portion 131 ensures a stable connection between the detection sub-boards 13, facilitating rapid assembly and expansion, and improving the scalability and standardization level of the cell detection assembly 100.
[0052] It should be noted that there are multiple ways to connect the detection sub-board 13. In the first possible implementation, the detection sub-board 13 is connected by bolts, nuts or screws, which is tight. Alternatively, in the second possible implementation, a snap-fit structure is used for connection, which is convenient and quick. This embodiment does not limit the connection.
[0053] Please see Figure 6 , Figure 6 The embodiments disclosed in this application Figure 5In the enlarged view at point A, in some possible embodiments, the connecting portion 131 on one of two adjacent detection sub-boards 13 is a plug 1311, and the connecting portion 131 on the other is a socket 1312. The plug 1311 and the socket 1312 cooperate to connect the two adjacent detection sub-boards 13 along the length direction perpendicular to the groove. In this way, while ensuring a stable connection between the detection sub-boards 13, rapid connection and disassembly between the detection sub-boards 13 are achieved, greatly improving the assembly and maintenance efficiency of the cell detection assembly 100. Directly setting the plug 1311 and socket 1312 on the detection sub-boards 13 reduces production costs. At the same time, when dealing with cell 2 of different sizes or layouts, the number and layout of the detection sub-boards 13 can be flexibly adjusted by using the plug 1311 and socket 1312, improving the adaptability of the cell detection assembly 100, facilitating replacement and maintenance, and reducing maintenance costs and downtime.
[0054] Optionally, the thickness of the detection plate 1 is 0.3mm-1.0mm. This thickness can ensure the rigidity of the detection plate 1 and avoid unnecessary deformation during the detection process, which would affect the detection accuracy. At the same time, it also maintains a certain degree of flexibility to facilitate adaptation to battery cells 2 of different sizes.
[0055] It is understandable that the detection plate 1 can use materials such as carbon nanotubes, indium tin oxide, and acrylic. In the first possible implementation, the detection plate 1 uses carbon nanotubes, which have excellent electrical properties and extremely high strength, toughness, and good chemical stability. In the second possible implementation, the detection plate 1 uses indium tin oxide, which has good chemical stability and processability.
[0056] As an optional implementation, the detection plate 1 is an acrylic plate. This ensures that the acrylic material has a certain conductivity and transparency to guarantee the feasibility of visual observation. At the same time, it has a low cost, which ensures the accuracy and stability of the cell detection assembly 100, while also reducing weight, improving operability, optimizing cost and maintenance, and enhancing the adaptability and versatility of the cell detection assembly 100.
[0057] In some embodiments, the first conductive element 111 is made of copper. Copper has low resistivity and stable electrical properties, ensuring efficient and accurate signal transmission during the detection process. It also ensures stable signal transmission and reduces signal attenuation. Furthermore, compared to other precious metals, copper is relatively inexpensive, which helps reduce the production cost of the cell detection assembly 100 and improve cost-effectiveness. In addition, copper has good corrosion resistance under normal conditions and maintains stable conductivity even in harsh environments, extending the service life of the cell detection assembly 100. Copper is also easy to process, mold, and connect, which facilitates the manufacturing of the conductive element and its integration with the detection board 1, simplifying the production process.
[0058] It should be noted that the first conductive element 111 can be a copper wire, copper strip, or copper sheet, and this embodiment does not limit this. When the first conductive element 111 is a copper wire, the diameter of the copper wire is 0.15mm-0.25mm. When the first conductive element 111 is a copper strip or copper sheet, the width of the first conductive element 111 in the direction perpendicular to the pressure of the battery cell 2 on the detection plate 1 is 0.15mm-0.25mm. A suitable width can reduce contact resistance, ensure effective signal transmission, and guarantee the conductivity of the first conductive element 111.
[0059] Combination Figure 2 and Figure 3 When the cell detection assembly 100 is used to power the cell 2, the two cell detection assemblies 100 are pressed together to press the front 2a and back 2b of the cell 2, so that the main grid 21 is inserted into the first groove 11 and contacts the first conductive member 111. The power supply device above (not shown in the figure) powers the cell detection assembly 100, and then powers the cell 2 and the main grid 21 to perform current-voltage detection and electroluminescence detection.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A battery cell detection assembly for detecting battery cells, wherein the surface of the battery cell is provided with a main grid, characterized in that, The battery cell detection assembly includes: The detection plate is made of transparent material and includes a first surface. A first groove is provided on the first surface. The size of the first groove matches the size of the main grid so that when the detection plate presses the battery cell, the main grid can be inserted into the first groove. A first conductive element is provided in the first groove. When the main grid is inserted into the first groove, the first conductive element contacts the main grid.
2. The battery cell testing assembly according to claim 1, characterized in that, The first conductive element is disposed at the bottom of the first groove, and the distance from the bottom of the first groove to the first surface is less than or equal to the height of the main gate.
3. The cell testing assembly according to claim 2, characterized in that, The width and length of the first groove match the width and length of the main gate.
4. The cell testing assembly according to claim 1, characterized in that, The detection plate also includes a second surface disposed opposite to the first surface. The second surface is provided with a second groove, and a second conductive element is provided in the second groove. The distance from the bottom of the first groove to the first surface is greater than the distance from the bottom of the second groove to the second surface. The front and back sides of the battery cell are provided with main grids. The first surface is used to press the front side of the battery cell, and the second surface is used to press the back side of the battery cell.
5. The cell testing assembly according to claim 4, characterized in that, The distance from the bottom of the first groove to the first surface is 6μm-10μm, and the distance from the bottom of the second groove to the second surface is 4μm-8μm.
6. The cell testing assembly according to claim 1, characterized in that, The detection plate is provided with a plurality of first grooves and a plurality of first conductive elements, and each of the first grooves on the detection plate can correspond one-to-one with each of the main grids.
7. The cell testing assembly according to claim 6, characterized in that, The detection plate includes multiple detection sub-plates, each of which is provided with the first groove and the first conductive element. The detection sub-plate is provided with a connecting portion to connect each detection sub-plate along the length direction perpendicular to the groove.
8. The cell testing assembly according to claim 7, characterized in that, The connecting part on one of the two adjacent detection sub-boards is a plug, and the connecting part on the other is a socket. The plug and the socket cooperate to connect the two adjacent detection sub-boards along the length direction perpendicular to the groove.
9. The cell testing assembly according to claim 1, characterized in that, The thickness of the detection plate is 0.3mm-1.0mm. And / or, The testing plate is made of acrylic sheet.
10. The cell testing assembly according to claim 9, characterized in that, The first conductive element is made of copper.