A solar cell sheet square resistance measuring device

Abstract

The utility model relates to solar cell piece technical field, specifically disclose a solar cell piece square resistance measuring device, including work table, the upper end surface of work table is provided with positioning mechanism, the upper end surface rear end fixedly connected with the top plate of L shape of work table, the lower end surface of top plate installs test four probe panel, the lower end surface of test four probe panel installs a plurality of left and right distribution's telescopic probe, the positioning mechanism includes setting in the positioning groove of work table top and the open structure of upper end and front end, through the positioning groove matched with cell piece, can be positioned to cell piece conveniently and quickly, convenient to use, through the resilience of a plurality of springs can respectively promote a plurality of moving rod and cell piece's a plurality of measuring points stable abut, further through telescopic probe, can make probe and cell piece measuring point between stable contact, avoid causing probe and cell piece measuring point's resistance unstable, and avoid scratching cell piece fragile antireflection film.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, and specifically discloses a device for measuring the sheet resistance of solar cells. Background Technology

[0002] Sheet resistance is a key parameter for measuring the emitter doping concentration and uniformity of solar cells, directly affecting the final conversion efficiency of the cell. Currently, the industry commonly uses the four-probe method for measurement. This method involves applying a constant current to the two probes on either side and measuring the voltage drop between the two middle probes, then calculating the sheet resistance value using a formula.

[0003] Currently, sheet resistance testing of solar cells is mostly conducted manually. During manual testing, it is difficult to maintain stable contact between the probe and the measurement point on the cell, which can easily lead to unstable resistance and affect the accuracy of the measurement results. Furthermore, since the probe is made of metal, it is very easy to scratch the fragile anti-reflective coating of the cell and even cause microcracks, resulting in losses. At the same time, when manually positioning the measurement point on the cell, it is easy to deviate, making it difficult to ensure that the probe and the measurement point on the cell are aligned, which is inconvenient to use. Utility Model Content

[0004] This invention proposes a device for measuring the sheet resistance of solar cells. Through a retractable probe, it can ensure stable contact between the probe and the measurement point of the solar cell, avoiding unstable resistance between the probe and the measurement point of the solar cell, and avoiding scratching the fragile anti-reflective film of the solar cell. Through the positioning groove that matches the solar cell, the solar cell can be positioned conveniently and quickly, making it easy to use.

[0005] This utility model is implemented as follows: a solar cell sheet resistance measuring device includes a worktable, a positioning mechanism is provided on the upper end surface of the worktable, an L-shaped top plate is fixedly connected to the rear end of the upper end surface of the worktable, a test four-probe panel is installed on the lower end surface of the top plate, and a plurality of telescopic probes distributed on the left and right are installed on the lower end surface of the test four-probe panel.

[0006] The positioning mechanism includes a positioning groove disposed above the workbench with an open structure at the top and front. The inner diameter of the positioning groove matches the outer diameter of the battery cell. An electric telescopic rod is installed on the lower end face of the workbench. The output end of the electric telescopic rod extends to the top of the workbench and is fixedly connected to the lower end face of the positioning groove.

[0007] The telescopic probe includes an outer cylinder mounted on the lower end face of the test four-probe panel, a movable rod slidably connected inside the outer cylinder, and a spring fixedly connected between the outer cylinder and the movable rod.

[0008] In a preferred embodiment of the solar cell sheet resistance measuring device of this utility model, a plurality of evenly distributed sliding rods are fixedly connected to the lower end face of the positioning groove. The lower ends of the plurality of sliding rods extend to the bottom of the worktable and are fixedly connected to a limit block. The plurality of sliding rods are slidably connected to the worktable.

[0009] In a preferred embodiment of the solar cell sheet resistance measuring device of this utility model, the front opening of the positioning groove is configured as a flared structure.

[0010] In a preferred embodiment of the solar cell sheet resistance measuring device of this utility model, the outer cylinder and the moving rod are slidably connected by a limiting groove and a limiting slider.

[0011] In a preferred embodiment of the solar cell sheet resistance measuring device of this utility model, the lower end of the moving rod is configured as a spherical structure.

[0012] As a preferred embodiment of the solar cell sheet resistance measuring device of this utility model, a control panel is installed on the upper surface of the workbench, and the control panel is electrically connected to the test four-probe panel and the electric telescopic rod respectively.

[0013] The beneficial effects of this utility model are:

[0014] The positioning slots that match the solar cells allow for convenient and quick positioning of the cells. The multiple springs provide a spring-loaded mechanism that pushes multiple moving rods to stably contact multiple measurement points on the solar cells. Furthermore, the retractable probes ensure stable contact between the probes and the measurement points on the solar cells, preventing unstable resistance measurements due to poor contact and avoiding scratches on the fragile anti-reflective coating of the solar cells. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a front cross-sectional view of the present invention.

[0018] Figure 3 This utility model Figure 2 Enlarged structural diagram of part a;

[0019] Figure 4 This is a schematic diagram of the right-side cross-sectional structure of this utility model.

[0020] The markings in the diagram are: 1. Workbench; 2. Top plate; 3. Test four-probe panel; 4. Telescopic probe; 5. Positioning slot; 6. Electric telescopic rod; 7. Outer cylinder; 8. Moving rod; 9. Spring; 10. Slide rod; 11. Limit block; 12. Control panel. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0022] Please see Figure 1-4 A sheet resistance measuring device for solar cells includes a worktable 1, a positioning mechanism on the upper surface of the worktable 1, an L-shaped top plate 2 fixedly connected to the rear end of the upper surface of the worktable 1, a test four-probe panel 3 installed on the lower surface of the top plate 2, and multiple telescopic probes 4 distributed left and right on the lower surface of the test four-probe panel 3.

[0023] The positioning mechanism includes a positioning groove 5 located above the workbench 1 with an open structure at the top and front. The inner diameter of the positioning groove 5 matches the outer diameter of the battery cell. An electric telescopic rod 6 is installed on the lower end face of the workbench 1. The output end of the electric telescopic rod 6 extends to the top of the workbench 1 and is fixedly connected to the lower end face of the positioning groove 5.

[0024] The telescopic probe 4 includes an outer cylinder 7 installed on the lower end face of the test four-probe panel 3. A movable rod 8 is slidably connected inside the outer cylinder 7, and a spring 9 is fixedly connected between the outer cylinder 7 and the movable rod 8.

[0025] In this embodiment: During use, the battery cell is moved from the front end of the positioning groove 5 into the interior of the positioning groove 5 until the rear end of the battery cell abuts against the rear inner wall of the positioning groove 5. At this time, multiple measuring points of the battery cell are vertically aligned with multiple telescopic probes 4. Since the inner diameter of the positioning groove 5 matches the outer diameter of the battery cell, the battery cell can be accurately positioned through the positioning groove 5. Furthermore, the positioning groove 5, which matches the battery cell, facilitates quick and easy positioning of the battery cell. It is convenient to use. Since the front opening of the positioning groove 5 is set as a flared structure, the flared structure makes it easy to move the battery cell into the interior of the positioning groove 5. Then, the electric telescopic rod 6 is extended by the control panel 12. The electric telescopic rod 6 drives the positioning groove 5 and the battery cell to move upward, so that multiple measuring points of the battery cell are vertically aligned with multiple telescopic probes 4. The lower end of probe 4 abuts against the battery cell, which then continues to move upward a certain distance. The battery cell pushes multiple moving rods 8 into multiple outer cylinders 7, causing multiple springs 9 to generate a rebound force. After the battery cell stops moving, the rebound force of multiple springs 9 can push multiple moving rods 8 to stably abut against multiple measurement points of the battery cell. The retractable probe ensures stable contact between the probe and the measurement points of the battery cell, avoiding unstable resistance between the probe and the measurement points of the battery cell and avoiding scratching the fragile anti-reflective film of the battery cell. Then, the sheet resistance of the battery cell is tested through the four-probe panel 3. After the test is completed, the electric telescopic rod 6 retracts, driving the positioning groove 5 to reset. Then, the battery cell in the positioning groove 5 is replaced, and the sheet resistance of the next battery cell is tested.

[0026] As a technical optimization of this utility model, the lower end face of the positioning groove 5 is fixedly connected with a plurality of evenly distributed slide rods 10. The lower ends of the plurality of slide rods 10 extend to the bottom of the worktable 1 and are fixedly connected with limit blocks 11. The plurality of slide rods 10 are slidably connected to the worktable 1.

[0027] In this embodiment: the positioning groove 5 can be limited by multiple sliding rods 10, which can make the positioning groove 5 move smoothly. Through the cooperation between multiple limiting blocks 11 and multiple sliding rods 10, the movement distance of the positioning groove 5 can be limited to prevent the positioning groove 5 from moving too much, causing the telescopic probe 4 to reach its maximum contraction range, causing the outer cylinder 7 to come into contact with the measurement point of the battery cell and scratch the measurement point of the battery cell.

[0028] As a technical optimization of this utility model, the front opening of the positioning groove 5 is set as a flared structure.

[0029] In this embodiment, the front opening of the positioning groove 5 is set as an flared structure to facilitate the movement of the battery cell into the interior of the positioning groove 5.

[0030] As a technical optimization of this utility model, the outer cylinder 7 and the moving rod 8 are slidably connected by a limiting groove and a limiting slider.

[0031] In this embodiment, the moving rod 8 can be limited by the limiting groove and the limiting slider to prevent the moving rod 8 from detaching from the outer cylinder 7.

[0032] As a technical optimization of this utility model, the lower end of the movable rod 8 is set as a spherical structure.

[0033] In this embodiment, the lower end of the moving rod 8 is set as a spherical structure, which can prevent the moving rod 8 from scratching the measurement point of the battery cell.

[0034] As a technical optimization of this utility model, a control panel 12 is installed on the upper surface of the workbench 1. The control panel 12 is electrically connected to the test four-probe panel 3 and the electric telescopic rod 6 respectively.

[0035] In this embodiment, the control panel 12 facilitates the control of the four-probe panel 3 and the electric telescopic rod 6.

[0036] The working principle and usage process of this utility model are as follows: During use, the battery cell is moved from the front end of the positioning groove 5 to the inside of the positioning groove 5 until the rear end of the battery cell abuts against the inner rear wall of the positioning groove 5. At this time, multiple measuring points of the battery cell are vertically aligned with multiple telescopic probes 4. Then, the electric telescopic rod 6 is extended via the control panel 12. The electric telescopic rod 6 drives the positioning groove 5 and the battery cell upwards, causing multiple measuring points of the battery cell to abut against the lower ends of multiple telescopic probes 4. The battery cell continues to move upwards a certain distance, pushing multiple moving rods 8 into multiple outer cylinders 7, and causing multiple springs 9 to generate a rebound force. After the battery cell stops moving, the rebound force of multiple springs 9 can push multiple moving rods 8 to stably abut against multiple measuring points of the battery cell. Then, the sheet resistance of the battery cell is tested via the four-probe test panel 3. After the test is completed, the electric telescopic rod 6 retracts, causing the positioning groove 5 to reset. Then, the battery cell in the positioning groove 5 is replaced, and the sheet resistance test of the next battery cell is performed.

[0037] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A device for measuring the sheet resistance of a solar cell, comprising a worktable (1), characterized in that: The upper end face of the workbench (1) is provided with a positioning mechanism. The rear end of the upper end face of the workbench (1) is fixedly connected with an L-shaped top plate (2). The lower end face of the top plate (2) is equipped with a test four-probe panel (3). The lower end face of the test four-probe panel (3) is equipped with multiple telescopic probes (4) distributed on the left and right. The positioning mechanism includes a positioning groove (5) set above the workbench (1) with an open structure at the top and front. The inner diameter of the positioning groove (5) matches the outer diameter of the battery cell. An electric telescopic rod (6) is installed on the lower end face of the workbench (1). The output end of the electric telescopic rod (6) extends to the top of the workbench (1) and is fixedly connected to the lower end face of the positioning groove (5). The telescopic probe (4) includes an outer cylinder (7) installed on the lower end face of the test four-probe panel (3), a movable rod (8) is slidably connected inside the outer cylinder (7), and a spring (9) is fixedly connected between the outer cylinder (7) and the movable rod (8).

2. The sheet resistance measuring device for solar cells according to claim 1, characterized in that: The lower end face of the positioning groove (5) is fixedly connected with a plurality of evenly distributed slide rods (10). The lower ends of the plurality of slide rods (10) extend to the bottom of the worktable (1) and are fixedly connected with limit blocks (11). The plurality of slide rods (10) are slidably connected to the worktable (1).

3. The sheet resistance measuring device for solar cells according to claim 1, characterized in that: The front opening of the positioning groove (5) is configured as a flared structure.

4. The sheet resistance measuring device for solar cells according to claim 1, characterized in that: The outer cylinder (7) and the moving rod (8) are slidably connected by a limiting groove and a limiting slider.

5. The sheet resistance measuring device for solar cells according to claim 1, characterized in that: The lower end of the movable rod (8) is configured as a spherical structure.

6. The sheet resistance measuring device for solar cells according to claim 1, characterized in that: The upper surface of the workbench (1) is equipped with a control panel (12), which is electrically connected to the test four-probe panel (3) and the electric telescopic rod (6).

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