Main-grid-free battery testing device
By designing a gridless battery testing device with ohmic contact between the contact test point and the fine grid line, the problem of unstable contact of the fine grid line in gridless back contact battery testing was solved, achieving accuracy and reliability of test results, and avoiding reduction in material costs and battery power.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
Existing gridless back contact battery testing devices struggle to ensure stable contact between each fine grid line and the test probe, leading to inaccurate test results and increased material costs.
Design a gridless battery testing device that uses contact test points to form ohmic contact with fine grid lines. The two ends of the contact test points are set to be straight to ensure that Wi < di < Di, and stable contact is maintained through vacuum adsorption holes to avoid the use of large-sized test points.
It improves the accuracy and reliability of test results, avoids increased material costs and decreased battery power, and is suitable for gridless back contact batteries.
Smart Images
Figure CN224095976U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery test technical field especially relates to a kind of main grid-free battery testing device. BACKGROUND
[0002] In the solar cell production and research and development process, the current-voltage (I-V) test and electroluminescence (EL) test need to be carried out on the battery sheet to obtain various electrical performance parameters of the battery sheet.
[0003] The battery sheet is divided into main grid battery and main grid-free battery according to whether there is a main grid. In the testing process of the main grid-free battery, stable contact between each fine grid of the main grid-free battery and the test probe needs to be ensured.
[0004] The main grid-free battery is divided into main grid-free bifacial cell and main grid-free back contact cell. The main grid-free back contact cell (BC) is a new type of solar cell technology, and its core feature is that the positive and negative electrodes of the battery are completely placed on the back of the battery sheet, thereby greatly improving the light utilization efficiency and photoelectric conversion efficiency.
[0005] At present, the testing device for main grid-free battery is more for main grid-free bifacial cell. The existing main grid-free bifacial cell usually directly uses a probe array to test the fine grid. Compared with the main grid-free bifacial cell, since the positive and negative electrodes of the main grid-free back contact cell are completely placed on the back of the battery sheet, the number of fine grids is larger, the spacing is narrower, and the diameter of the fine grid itself is narrow (about 30 μm). However, the size of the existing test probe is too large, so it is difficult to ensure that each fine grid is detected. The common solution is to increase a test point with a large size on the main grid-free back contact cell. The test point is printed together with the fine grid, but the test point increases the material cost and reduces the battery power. UTILITY MODEL CONTENTS
[0006] The utility model aims at the existing technical status, and provides a main grid-free battery testing device.
[0007] The testing device of the utility model can ensure the accuracy and reliability of the test results, can be applied to gridless line battery, especially main grid-free back contact cell, and can avoid the problems such as increase of material cost and reduction of battery power caused by setting a large-size test point on the main grid-free back contact cell.
[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0009] The utility model discloses a main grid-free battery testing device, which comprises a test base, a plurality of contact test points for forming ohmic contact with fine grid lines on a battery to be tested are arranged on the test base,
[0010] The contact test point forms flat ends at two ends of the first direction, the flat ends extend along the second direction, the first direction and the second direction are arranged crossly, wherein,
[0011] W i <d i <D i ,
[0012] In the formula, d i is the relative distance between the flat ends at two ends of the contact test point i, W i is the line width of the corresponding fine grid line on the battery to be tested, D i is the relative distance between the corresponding fine grid line and the adjacent fine grid line adjacent to the corresponding fine grid line, the corresponding fine grid line is the fine grid line on the battery to be tested which is in contact with the contact test point i.
[0013] In some embodiments, the cross-sectional shape of the contact test point is a polygon with at least two parallel sides.
[0014] In some embodiments, the cross-sectional shape of the contact test point is any one of a right-angled rectangle, a rounded rectangle, and a chamfered rectangle.
[0015] In some embodiments, the test base is provided with vacuum suction holes for adsorbing the battery to be tested.
[0016] In some embodiments, each of the contact test points is provided with the vacuum suction holes on both sides in the second direction.
[0017] In some embodiments, the test base comprises a substrate, and the contact test points at least partially protrude from the surface of the substrate.
[0018] In some embodiments, the part of the contact test point protruding from the surface of the substrate forms a protruding part, and the height of the protruding part is at least 10 μm.
[0019] In some embodiments, the height of the protruding part is 10 μm to 300 μm.
[0020] In some embodiments, L i > d i ,
[0021] In the formula, L i is the relative distance between the two ends in the second direction of the contact test point i, and d i is the relative distance between the flat ends at two ends of the contact test point i.
[0022] In some embodiments, the test device is further provided with at least two current needles with opposite polarities and at least two voltage needles with opposite polarities, the current needles and the voltage needles are respectively electrically connected with the contact test points, wherein,
[0023] 0.25 < s < 0.5l0
[0024] In the formula, l0 is the length of the battery to be measured in the second direction, and s is the relative distance between the test position of the voltage needle and any one end of the battery to be measured in the second direction.
[0025] In some embodiments, the contact test points include first polarity test contacts and second polarity test contacts, the first polarity test contacts are used to form ohmic contact with the positive fine grid lines on the battery under test, and the second polarity test contacts are used to form ohmic contact with the negative fine grid lines on the battery under test.
[0026] The first polarity test contacts and the second polarity test contacts are staggered in the first direction.
[0027] In some embodiments, a plurality of the first polarity test contacts are arranged in sequence along the first direction, and a plurality of the first polarity test contacts are arranged in sequence along the second direction.
[0028] A plurality of the second polarity test contacts are arranged in sequence along the first direction, and a plurality of the second polarity test contacts are arranged in sequence along the second direction.
[0029] In some embodiments, the test device is also provided with conductive busbars, which are arranged on the side of the contact test points away from the battery to be measured, and the conductive busbars include a plurality of first polarity busbars and a plurality of second polarity busbars, the same first polarity busbar is electrically connected to a plurality of first polarity test contacts arranged along the first direction and located on the same straight line, and the same second polarity busbar is electrically connected to a plurality of second polarity test contacts arranged along the first direction and located on the same straight line.
[0030] The beneficial effects of the utility model lie in:
[0031] The utility model discloses a contact test point, which is in contact with the fine grid lines on the battery to be measured, and the two ends of the contact test point in the first direction are flat, and W i <d i <D iThe shape and arrangement of the contact test points can better match the fine grid lines of the battery to be tested, the fine grid lines are arranged to correspond to the contact test points and contact each other when the battery to be tested is placed on the test base, and a certain degree of relative offset of the fine grid lines in the first direction is allowed, so that the fine grid lines can be collected smoothly without being affected by the printing deviation of the fine grid lines or the deviation of the battery to be tested, the electrical parameter information of each fine grid line can be collected, the accuracy and reliability of the test results are ensured, the test device can be applied to a gridless battery, especially a gridless back contact battery, and problems such as increase of material cost and decrease of battery power caused by the large-size test points of the gridless back contact battery can be avoided. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 A structure schematic view of a test base of a main grid-free battery test device according to an embodiment of the present application.
[0033] Figure 2 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application. Figure 1 A partial enlarged view of A part of the main grid-free battery test device according to an embodiment of the present application.
[0034] Figure 3 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0035] Figure 4 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0036] Figure 5 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0037] Figure 6 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0038] Figure 7 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0039] Figure 8 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0040] Figure 9 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application.
[0041] Figure 10 A structure schematic view of a main grid-free battery test device according to an embodiment of the present application. DETAILED DESCRIPTION
[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.
[0043] In the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" or "several" means two or more, unless otherwise explicitly specified.
[0044] In the description of this utility model, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or the first feature and the second feature not being in direct contact but being in contact through another feature between them.
[0045] It is understandable that the contact test point 2 and the conductive busbar 6 themselves do not have polarity. In this utility model, for ease of description, the polarity of the contact test point 2 and the conductive busbar 6 refers to their polarity on a certain battery cell. The polarity of the contact test point 2 and the conductive busbar 6 on a certain battery cell is consistent with the polarity of the fine grid lines collected on that battery cell. Correspondingly, the fine grid lines of the opposite polarity are the fine grid lines on the battery cell with the opposite polarity to the fine grid lines collected. For example, if the contact test point 2 is in ohmic contact with the positive fine grid line on a certain battery cell, then the polarity of the contact test point 2 on that battery cell is positive, and the corresponding fine grid line of the opposite polarity is the negative fine grid line.
[0046] See Figures 1 to 4 As shown, this utility model discloses a gridless battery testing device, including a test base 1, on which a plurality of contact test points 2 are provided for forming ohmic contact with the fine grid lines 71 on the battery under test 7.
[0047] The contact test point 2 forms straight ends 23 at both ends in the first direction, and the straight ends 23 extend along the second direction, with the first direction and the second direction intersecting.
[0048] W i <d i <D i ,
[0049] In the formula, d i is the relative distance between the two flat ends 23 of the contact test point 2i (i.e., the i-th contact test point 2), W i is the line width of the corresponding fine grid line 71 on the battery 7 to be tested, and D i is the relative distance between the corresponding fine grid line 71 and the adjacent fine grid line 71 adjacent thereto, and the corresponding fine grid line 71 is the fine grid line 71 on the battery 7 to be tested that is in contact with the contact test point 2i.
[0050] It can be understood that the first direction and the second direction are crossly arranged, and the included angle formed between the first direction and the second direction can be a right angle, an acute angle or an obtuse angle.
[0051] In the utility model, the contact test point 2 is arranged on the test base 1, the fine grid line 71 on the battery 7 to be tested is contacted by the contact test point 2, the electrical property parameter information such as current and voltage of the fine grid line 71 is transmitted by the contact test point 2, compared with the existing test probe, the shape and size of the contact test point 2 are more free, simultaneously, in the utility model, the two ends of the contact test point 2 in the first direction are arranged as flat ends 23, the contact test point 2 forms the shape structure of elongated, flat ends and similar line type, can be more compliant with the line type structure of the fine grid line 71, and can be arranged according to the arrangement and layout of the fine grid line 71, when the battery 7 to be tested is placed on the test base 1, the fine grid line 71 is just arranged corresponding to the contact test point 2 and contacted, wherein d i >W i , can ensure that the fine grid line 71 can still be contacted with the corresponding contact test point 2 under the condition that there is a certain degree of relative offset of the fine grid line 71 in the first direction, guarantees that the electrical property parameter information of each fine grid line 71 can be collected, D i >d i , can avoid that the contact test point 2 is contacted with the adjacent fine grid line 71 in the first direction and causes short circuit.
[0052] The utility model discloses a contact test point 2 is arranged, the fine grid line 71 on the battery 7 to be tested is contacted by the contact test point 2, and the two ends of the contact test point 2 in the first direction are arranged as flat ends 23, and W i <d i <D iThe shape and arrangement of the contact test point 2 are better matched with the fine grid lines 71 of the battery to be tested, and when the battery to be tested 7 is placed on the test base 1, the fine grid lines 71 are just arranged corresponding to the contact test point 2 and are in contact with each other, and a certain degree of relative offset of the fine grid lines 71 in the first direction is allowed, so as to avoid the influence of the printing deviation of the fine grid lines 71 or the deviation of the battery to be tested 7 on the collection of the electrical parameter information of the fine grid lines 71, ensure that the electrical parameter information of each fine grid line 71 can be collected, and ensure the accuracy and reliability of the test results. It can be applied to gridless batteries, especially gridless back contact batteries, and can avoid the problems of increasing material cost and reducing battery power caused by setting large-size test points on gridless back contact batteries.
[0053] In some embodiments, referring to Figures 4 to 8 The cross-sectional shape of the contact test point 2 is a polygon with at least two parallel sides.
[0054] For example, the contact test point 2 can be a rounded rectangle, a right-angled rectangle, a chamfered rectangle, a parallel polygon structure, a waist hole structure, or a polygon with asymmetric or irregular lines on the two sides in the second direction, but is not limited thereto.
[0055] In some embodiments, referring to Figures 4 to 6 The cross-sectional shape of the contact test point 2 is any one of a right-angled rectangle, a rounded rectangle, or a chamfered rectangle, so that the flat end 23 located at the edge of the contact test point 2 in the first direction also has a large width. When the corresponding fine grid line 71 contacts the contact test point 2 near the flat end 23, they can still have a large contact surface, ensuring stable contact between the corresponding fine grid line 71 and the contact test point 2. At the same time, such regular shape is also more convenient for manufacturing.
[0056] More preferably, the cross-sectional shape of the contact test point 2 is a right-angled rectangle.
[0057] In some embodiments, referring to Figure 2 As shown in the figure, the test base 1 is provided with vacuum suction holes 3 for adsorbing the battery to be tested 7.
[0058] The vacuum suction holes 3 can adsorb the battery to be tested 7 by vacuum suction, so as to ensure that the battery to be tested 7 does not shake or displace relative to the test base 1 during the test, and ensure that each fine grid line 71 can be in contact with its corresponding contact test point 2. At the same time, the vacuum suction holes 3 can press the contact test point 2 and the corresponding fine grid line 71 together to form stable contact, ensuring the accuracy and reliability of the electrical performance parameters.
[0059] In some embodiments, the test base 1 is provided with an air flow channel, the air flow channel is in communication with the vacuum suction holes 3, and the air flow channel is connected with a vacuum pump.
[0060] In some embodiments, see Figure 2 As shown, each contact test point 2 has a vacuum adsorption hole 3 on both sides in the second direction.
[0061] By setting the vacuum adsorption holes 3 on both sides of each contact test point 2 in the second direction, the pressure between the contact test points 2 at different positions and the corresponding fine grid lines 71 can be more uniform, which can further improve the accuracy and reliability of electrical performance parameters.
[0062] Understandably, in actual use, this testing device can achieve the pressing between the contact test point 2 and the corresponding fine grid line 71 by adsorption through the vacuum adsorption hole 3, or by pressing the glass plate / elastic wire or other pressing mechanism set above the battery under test 7, which can also achieve the pressing between the contact test point 2 and the corresponding fine grid line 71. This is not limited here.
[0063] In some embodiments, see Figure 1 As shown, the test base 1 includes a substrate 11, and the contact test point 2 protrudes at least partially from the surface of the substrate 11, which can ensure stable contact between the contact test point 2 at different positions and the corresponding fine gate line 71, further improving the accuracy and reliability of electrical performance parameters.
[0064] In some embodiments, the portion of the contact test point 2 protruding from the surface of the substrate 11 forms a protrusion, the height of which is at least 10 μm, so that the ohmic contact between the contact test point 2 at different positions and the corresponding fine gate line 71 is more stable.
[0065] In some embodiments, the height of the protrusion is 10 μm to 300 μm.
[0066] For example, the height of the protrusion may be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 180μm, 200μm, 220μm, 250μm, 280μm or 300μm, but is not limited thereto.
[0067] Excessive protrusion can increase material costs, and the tested battery is prone to deformation during pressing.
[0068] In some embodiments, see Figure 2 As shown, L i >d i ,
[0069] In the formula, L i d represents the relative distance between the two ends of the contact test point 2i in the second direction. iIn order to contact the relative distance between the two straight ends 23 of the two ends of the test point 2i, so that the contact test point 2 has a relatively large area, on the one hand, it has a larger contact area with the corresponding fine grid line 71 to form a stable ohmic contact, and on the other hand, it can form a stable connection with the busbar and other elements to ensure the stable transmission of the electrical parameters of the corresponding fine grid line 71.
[0070] In some embodiments, referring to Figure 10 As shown, the test device is also provided with at least two current needles 4 with opposite polarities and at least two voltage needles 5 with opposite polarities, and the current needles 4 and the voltage needles 5 are electrically connected with the contact test point 2 respectively, wherein,
[0071] 0.25l0≤s≤0.5l0
[0072] In the formula, l0 is the length of the battery 7 to be tested in the second direction, and s is the relative distance between the test position of the voltage needle 5 and any one end of the battery 7 to be tested in the second direction.
[0073] In the prior art, when the 4-wire test method is used for testing, the voltage needle 5 is often arranged at the edge of the battery 7 to be tested, which will cause the measured fill factor to be distorted, affecting the accuracy and reliability of the detection result. In the present embodiment, the test position of the voltage needle 5 is improved to effectively avoid the problem of fill factor distortion, and further improve the accuracy and reliability of the detection result.
[0074] For example, in some embodiments, the test device is provided with four voltage needles 5, including two P-zone voltage needles 51 and two N-zone voltage needles 52.
[0075] In some embodiments, the number of current needles 4 is greater than the number of voltage needles 5, and the current needles 4 are uniformly arranged along the second direction to facilitate uniform collection of the current at each position of the battery 7 to be tested.
[0076] In some embodiments, referring to Figure 1 and Figure 3 As shown, the contact test point 2 includes a first polarity test contact 21 and a second polarity test contact 22, the first polarity test contact 21 is used to form an ohmic contact with the positive fine grid line 711 on the battery to be tested, and the second polarity test contact 22 is used to form an ohmic contact with the negative fine grid line 712 on the battery to be tested,
[0077] The first polarity test contact 21 and the second polarity test contact 22 are staggered arranged in the first direction.
[0078] On the battery to be tested, the positive fine grid lines 711 and the negative fine grid lines 712 are staggered along the first direction. By staggering the first polarity test contacts 21 and the second polarity test contacts 22 along the first direction, the contact test points 2 corresponding to adjacent positive fine grid lines 711 and negative fine grid lines 712 do not interfere with each other or come into contact to cause short circuit.
[0079] In some embodiments, as shown in Figure 1 and Figure 10 a plurality of first polarity test contacts 21 are arranged in sequence along the first direction, and a plurality of first polarity test contacts 21 are arranged in sequence along the second direction.
[0080] a plurality of second polarity test contacts 22 are arranged in sequence along the first direction, and a plurality of second polarity test contacts 22 are arranged in sequence along the second direction.
[0081] In this way, each fine grid line 71 has a corresponding polarity test contact, and the electrical parameters of the fine grid lines 71 at different positions of the battery to be tested can be collected, ensuring the accuracy and reliability of the test results.
[0082] In some embodiments, as shown in Figure 1 and Figure 9 The test device is also provided with a conductive busbar 6 arranged on the side of the contact test points 2 facing away from the battery to be tested 7. The conductive busbar 6 includes a plurality of first polarity busbars 61 and a plurality of second polarity busbars 62. The same first polarity busbar 61 is electrically connected to a plurality of first polarity test contacts 21 arranged along the first direction and located on the same straight line. The same second polarity busbar 62 is electrically connected to a plurality of second polarity test contacts 22 arranged along the first direction and located on the same straight line. Thus, through the cooperation of the conductive busbar 6 and the contact test points 2, the electrical parameters of each fine grid line 71 on the battery to be tested can be collected and transmitted.
[0083] In the description of the present specification, the description of the terms "some embodiments", "embodiments", "exemplary", "example", or "for example" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0084] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are obtained. Any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the present application.
Claims
1. A gridless battery testing device, characterized in that, The test base includes several contact test points for forming ohmic contact with the fine grid lines on the battery under test. The contact test point forms straight ends at both ends in the first direction, and the straight ends extend along the second direction, wherein the first direction and the second direction intersect. W i <d i <D i , In the formula, d i W is the relative distance between the two straight ends at the contact test point i. i D represents the linewidth of the corresponding fine grid line on the battery under test. i The relative distance between the corresponding fine grid line and its adjacent adjacent fine grid line is defined as the fine grid line on the battery under test that is in contact with the contact test point i.
2. The gridless battery testing device according to claim 1, characterized in that, The cross-sectional shape of the contact test point is a polygon with at least two parallel sides.
3. The gridless battery testing device according to claim 2, characterized in that, The cross-sectional shape of the contact test point can be any one of a right-angled rectangle, a rounded rectangle, or a chamfered rectangle.
4. The gridless battery testing device according to claim 1, characterized in that, The test base has vacuum adsorption holes for adsorbing the battery to be tested.
5. The gridless battery testing device according to claim 4, characterized in that, Each of the contact test points is provided with a vacuum adsorption hole on both sides in the second direction.
6. The gridless battery testing device according to claim 1, characterized in that, The test base includes a substrate, and the contact test points at least partially protrude from the surface of the substrate.
7. The gridless battery testing device according to claim 6, characterized in that, The portion of the contact test point protruding from the substrate surface forms a protrusion, the height of which is at least 10 μm.
8. The gridless battery testing device according to claim 7, characterized in that, The height of the protrusion is 10μm to 300μm.
9. The gridless battery testing device according to claim 1, characterized in that, L i >d i , In the formula, L i Let d be the relative distance between the two ends in the second direction at contact test point i. i The distance between the two straight ends of the contact test point i is denoted as i.
10. A gridless battery testing device according to claim 1, characterized in that, The testing device also includes at least two current needles with opposite polarities and at least two voltage needles with opposite polarities, wherein the current needles and the voltage needles are electrically connected to the contact test point, wherein... 0.25l0≤s≤0.5l0 In the formula, l0 is the length of the battery under test in the second direction, and s is the relative distance between the test position of the voltage needle and any end of the battery under test in the second direction.
11. The gridless battery testing device according to claim 1, characterized in that, The contact test points include a first polarity test contact and a second polarity test contact. The first polarity test contact is used to form an ohmic contact with the positive electrode fine grid lines on the battery under test, and the second polarity test contact is used to form an ohmic contact with the negative electrode fine grid lines on the battery under test. The first polarity test contact and the second polarity test contact are arranged alternately in a first direction.
12. The gridless battery testing device according to claim 11, characterized in that, A plurality of first polarity test contacts are arranged sequentially along a first direction, and a plurality of first polarity test contacts are arranged sequentially along a second direction; A plurality of second polarity test contacts are arranged sequentially along the first direction, and a plurality of second polarity test contacts are arranged sequentially along the second direction.
13. The gridless battery testing device according to claim 12, characterized in that, The testing device is further provided with a conductive busbar, which is located on the side of the contact test point facing away from the battery under test. The conductive busbar includes a plurality of first polarity busbars and a plurality of second polarity busbars. The same first polarity busbar is electrically connected to a plurality of first polarity test contacts arranged along a first direction and located on the same straight line. The same second polarity busbar is electrically connected to a plurality of second polarity test contacts arranged along a first direction and located on the same straight line.