Tool for bending fatigue test of photovoltaic cell

Abstract

The utility model discloses a tool for a bending fatigue test of a photovoltaic cell, which belongs to the technical field of cell test tools and comprises a base. The two supporting mechanisms are oppositely arranged, each supporting mechanism comprises an upper supporting rod and a lower supporting rod which are arranged on the base, and a gap is formed between each upper supporting rod and the corresponding lower supporting rod; the bending mechanism comprises an upper pressing rod and a lower pressing rod, the upper pressing rod and the lower pressing rod are used for being connected with a testing machine, and the testing machine is used for driving the upper pressing rod and the lower pressing rod to synchronously ascend and descend; the upper pressing rod and the lower pressing rod are located between the two upper supporting rods, a gap is formed between the upper pressing rod and the lower pressing rod, and the upper pressing rod, the lower pressing rod and the upper supporting rods are arranged in parallel. According to the utility model, the bending cycle test of the front and back surfaces of the battery can be completed without taking out the battery, and in the cycle test process, manual intervention is not needed, the test efficiency is improved, and test errors caused by manual intervention are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery test frock technical field, in particular to a kind of frock for photovoltaic cell bending fatigue test. BACKGROUND

[0002] Photovoltaic cell technology develops rapidly, and different structures of cells such as PERC, TOPCon, HJT, BC, etc. appear. In the cell process, the etching process, laser process and high temperature process reduce the bending strength of the cell. In addition, the stress between different film layers is different, which also reduces the bending strength of the cell. Therefore, the two surfaces of the cell need to be tested by cyclic bending. When the existing test frock is used, it can only test the bending in a single direction on the front or back surface of the cell after single clamping. If double-sided testing is to be completed, manual re-clamping and adjustment of the testing surface direction are required, which not only reduces the testing efficiency, but also affects the comparability of the test data due to the positioning error caused by repeated positioning.

[0003] Therefore, a frock for photovoltaic cell bending fatigue test is proposed. SUMMARY

[0004] The utility model aims to provide a kind of frock for photovoltaic cell bending fatigue test, to solve or improve at least one of the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme: the utility model provides a kind of frock for photovoltaic cell bending fatigue test, comprising:

[0006] a base;

[0007] two sets of support mechanisms, the two sets of support mechanisms are oppositely arranged, the support mechanism includes an upper support rod and a lower support rod arranged on the base, and the upper support rod and the lower support rod have a gap therebetween;

[0008] a bending mechanism, the bending mechanism includes an upper pressing rod and a lower pressing rod, the upper pressing rod and the lower pressing rod are used to be connected with a testing machine, the testing machine is used to drive the upper pressing rod and the lower pressing rod to rise and fall synchronously, the upper pressing rod and the lower pressing rod are located between the two upper support rods, the upper pressing rod and the lower pressing rod have a gap therebetween, and the upper pressing rod, the lower pressing rod, the upper support rod and the lower support rod are arranged in parallel.

[0009] Preferably, two limiting baffle plates are arranged on the base, the two limiting baffle plates are respectively located on the two sides of the two upper support rods, the two ends of the upper support rod and the lower support rod respectively have threaded segments, and nuts are threadedly connected to the threaded segments.

[0010] Preferably, a sliding rail is fixedly connected to the base, the sliding direction of the sliding rail is perpendicular to the upper support rod, a first sliding block is fixedly connected to the bottom of the limiting baffle, the first sliding block is slidably connected to the sliding rail, and a positioning piece detachably connected to the sliding rail is arranged on the first sliding block.

[0011] Preferably, the positioning piece comprises a first screw threadedly connected to the first sliding block, and a plurality of positioning holes are formed in the sliding rail along the length direction of the sliding rail, and the first screw is threadedly connected to any one of the positioning holes.

[0012] Preferably, two support frames are arranged on the base, and the upper support rod and the lower support rod of the support mechanism are fixedly connected to the support frames.

[0013] Preferably, a second sliding block is fixedly connected to the bottom of the support frame, the second sliding block is slidably connected to the sliding rail, a second screw is threadedly connected to the second sliding block, and the second screw is threadedly connected to any one of the positioning holes.

[0014] Preferably, the upper pressing rod and the lower pressing rod are fixedly connected to a pressing rod support, and the pressing rod support is used to be connected to a testing machine.

[0015] Preferably, the distance between the upper support rod and the lower support rod is 3-5 cm, and the distance between the upper pressing rod and the lower pressing rod is 0.3-0.5 mm.

[0016] The utility model discloses the following technical effects: the battery positive face is placed between the upper support rod and the lower support rod of two groups of support mechanism (or upwards), and also is located between the upper pressing rod and the lower pressing rod, makes the battery positive face (or back) contact lower support rod, and the lower support rod plays the supporting role, and the battery back (or positive face) contacts the upper pressing rod, and the upper pressing rod is driven to descend through the testing machine, thereby the force of bending downward is exerted to the battery, after completing the bending test downward, the testing machine drives the battery to restore the original position and continues to ascend, and the battery positive face (or back) contacts the lower pressing rod, and the battery back (or positive face) contacts the upper support rod, and the testing machine drives the lower pressing rod to ascend and thereby the force of bending upward is exerted to the battery, and the bending upward is completed. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of this application are used to provide further understanding of the application, and the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application.

[0018] Figure 1 It is the structural schematic diagram of the utility model.

[0019] Fig. 1, upper support rod; 2, lower support rod; 3, upper pressing rod; 4, lower pressing rod; 5, support frame; 6, pressing rod support; 7, limiting baffle; 8, nut; 9, base. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the prior art, the main components of the bending strength test tool are two support rods and a pressing rod. The pressing rod is located between the two support rods. The support rods are fixedly connected to the base through a support rod support. The pressing rod is connected to the testing machine through a pressing rod support. During testing, first, the battery is placed on the two support rods with the front face downward (or upward), and the pressing rod is pressed against the back face (or the front face) of the battery. Pressure is applied to the sample to bend it downward to a set bending value, and the testing machine is reset. Then, the battery is taken out and placed on the two support rods with the front face upward (or downward), and the pressing rod is pressed against the front face (or the back face) of the battery. Pressure is applied to the sample to bend it to a set bending value, and the testing machine is reset. One cycle of testing is completed. However, this testing method has the following disadvantages:

[0022] 1. The testing process is complicated.

[0023] 2. Manual flipping is required, increasing labor costs.

[0024] 3. Manual taking and placing can cause deviation of the battery position, resulting in testing errors. The discontinuity of testing also leads to long testing time. Generally, a battery is tested for at least 1000 cycles or more. According to the testing device in the prior art, continuous testing requires 5 hours or even longer. The battery is exposed to air for too long, which can change the electrical performance and bending strength performance of the battery, thereby affecting the accuracy of the test.

[0025] To make the above-mentioned purposes, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments.

[0026] Reference Figure 1 The present application provides a tool for bending fatigue testing of photovoltaic cells, comprising:

[0027] a base 9;

[0028] Two sets of support mechanisms, the two sets of support mechanisms are oppositely arranged, the support mechanism comprises an upper support rod 1 and a lower support rod 2 arranged on the base 9, and the upper support rod 1 and the lower support rod 2 have a gap therebetween;

[0029] A bending mechanism, the bending mechanism comprises an upper pressing rod 3 and a lower pressing rod 4, the upper pressing rod 3 and the lower pressing rod 4 are used to be connected with a testing machine, the testing machine is used to drive the upper pressing rod 3 and the lower pressing rod 4 to synchronously ascend and descend; the upper pressing rod 3 and the lower pressing rod 4 are located between the two upper support rods 1, the upper pressing rod 3 and the lower pressing rod 4 have a gap therebetween, and the upper pressing rod 3, the lower pressing rod 4, the upper support rod 1 and the lower support rod 2 are arranged in parallel.

[0030] The battery is placed between the upper support rod 1 and the lower support rod 2 of the two sets of support mechanisms with the front face downward (or upward), and is also located between the upper pressing rod 3 and the lower pressing rod 4, so that the front face (or the back face) of the battery contacts the lower support rod 2, the lower support rod 2 plays a supporting role, the back face (or the front face) of the battery contacts the upper pressing rod 3, the upper pressing rod 3 is driven to descend by the testing machine, so that a downward bending force is applied to the battery, after the downward bending test is completed, the testing machine drives the battery to return to the original position and then continues to ascend, the front face (or the back face) of the battery contacts the lower pressing rod 4, the back face (or the front face) of the battery contacts the upper support rod 1, and the lower pressing rod 4 is driven to ascend by the testing machine, so that an upward bending force is applied to the battery, and the upward bending is completed.

[0031] In some optional embodiments, two limiting baffle plates 7 are arranged on the base 9, the two limiting baffle plates 7 are located on the two sides of the two upper support rods 1 respectively, and the two ends of the upper support rod 1 and the lower support rod 2 are respectively provided with threaded segments, and the threaded segments are threadedly connected with nuts 8.

[0032] After the battery is placed, the two limiting baffle plates 7 contact the two sides of the battery, and the two nuts 8 contact the other two sides of the battery, so that the battery is limited, and it is ensured that the position of the battery does not change in each cycle test, so as to reduce the test deviation caused by the change of the position of the battery.

[0033] In some optional embodiments, the base 9 is fixedly connected with a sliding rail (not shown in the figure), the sliding direction of the sliding rail is perpendicular to the upper support rod 1, the limiting baffle plate 7 is fixedly connected with a first sliding block (not shown in the figure) at the bottom, the first sliding block is slidably connected with the sliding rail, and the first sliding block is provided with a positioning piece which is detachably connected with the sliding rail.

[0034] In some optional embodiments, the positioning piece comprises a first screw (not shown in the figure) which is threadedly connected with the first sliding block, a plurality of positioning holes are formed in the sliding rail along the length direction of the sliding rail, and the first screw is threadedly connected with any positioning hole.

[0035] When installing the battery, the two limiting baffle plates 7 are pulled apart by a certain distance, the battery is placed between the upper support rod 1 and the lower support rod 2, the upper pressing rod 3 and the lower pressing rod 4, then the two limiting baffle plates 7 are pulled close and located on both sides of the battery, and the first screw is screwed into the positioning hole in the corresponding position to realize the positioning of the limiting baffle plate 7.

[0036] In some optional embodiments, two support frames 5 are arranged on the base 9, and the upper support rod 1 and the lower support rod 2 on the support mechanism are fixedly connected to the support frames 5.

[0037] In some optional embodiments, a second sliding block (not shown in the figure) is fixedly connected to the bottom of the support frame 5, the second sliding block is slidingly connected with the sliding rail, a second screw is threadedly connected to the second sliding block, and the second screw is threadedly connected with any positioning hole.

[0038] The position of the support frame 5 can be changed through the second sliding block, so that the corresponding upper support rod 1 and lower support rod 2 can be supported at different positions of the battery.

[0039] In some optional embodiments, the upper pressing rod 3 and the lower pressing rod 4 are fixedly connected to the pressing rod support 6, and the pressing rod support 6 is used to be connected with the testing machine.

[0040] The pressing rod support 6 is provided with a positioning pin, and the positioning pin is connected with the testing machine through the positioning pin; specifically, a positioning hole is formed on the testing machine, the positioning pin is passed through the positioning hole and is fastened through a nut.

[0041] In some optional embodiments, the distance between the upper support rod 1 and the lower support rod 2 is 3-5 cm, and the distance between the upper pressing rod 3 and the lower pressing rod 4 is 0.3-0.5 mm.

[0042] When the battery sample is bent downward, the battery sample only contacts the lower support rod 2 and does not contact the upper support rod 1; similarly, when the sample is bent upward, the sample only contacts the upper support rod 1 and does not contact the lower support rod 2.

[0043] In the embodiment, a scale is engraved on the base 9.

[0044] The use method of the utility model is as follows:

[0045] 1, installation and positioning: the two limiting baffle plates 7 are pulled apart by a certain distance, the battery is placed between the upper support rod 1 and the lower support rod 2, the upper pressing rod 3 and the lower pressing rod 4, then the two limiting baffle plates 7 are pulled close and located on both sides of the battery, and the first screw is screwed into the positioning hole in the corresponding position to realize the positioning of the limiting baffle plate 7; the position of the nut 8 is adjusted to be aligned with the side of the battery, so that the limiting of the battery sample is realized.

[0046] 2. Cyclic Test: Place the battery face down (or face up), with the front (or back) contacting the lower support rod 2, which provides support. The back (or front) contacts the upper pressure rod 3. The upper pressure rod 3 applies a downward bending force to the battery. After bending downwards, the battery returns to its original position. Then, with the upper support rod 1 as support, the lower pressure rod 4 applies an upward bending force to the battery, completing the upward bending. Repeat this cyclic test.

[0047] This utility model has the following advantages:

[0048] 1. By setting up the upper support rod 1 and the lower support rod 2, and the upper pressure rod 3 and the lower pressure rod 4, the front and back bending cycles can be achieved without removing the battery, saving testing time and reducing the impact of long-term exposure of the battery to air on electrical performance and bending strength.

[0049] 2. The battery can be limited by the limiting baffle 7 and the nut 8 to ensure that the position of the battery does not change in each test cycle, thereby reducing the test deviation caused by changes in the position of the battery; and the positions of the limiting baffle 7 and the nut 8 are adjustable to adapt to the testing of batteries of different sizes.

[0050] 3. Throughout the entire cycle test, operators do not need to flip the battery, reducing test errors caused by manual intervention and reducing labor costs.

[0051] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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.

[0052] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A fixture for bending fatigue testing of photovoltaic cells, characterized in that, include: Base (9); Two sets of support mechanisms are arranged opposite to each other. Each support mechanism includes an upper support rod (1) and a lower support rod (2) arranged on the base (9). There is a gap between the upper support rod (1) and the lower support rod (2). A bending mechanism is provided, comprising an upper pressure rod (3) and a lower pressure rod (4). The upper pressure rod (3) and the lower pressure rod (4) are connected to a testing machine, which drives the upper pressure rod (3) and the lower pressure rod (4) to move up and down synchronously. The upper pressure rod (3) and the lower pressure rod (4) are located between two upper support rods (1), and there is a gap between the upper pressure rod (3) and the lower pressure rod (4). The upper pressure rod (3), the lower pressure rod (4), the upper support rod (1), and the lower support rod (2) are arranged in parallel.

2. The fixture for bending fatigue testing of photovoltaic cells according to claim 1, characterized in that: The base (9) is provided with two limiting baffles (7), which are located on both sides of the two upper support rods (1). The two ends of the upper support rod (1) and the lower support rod (2) are respectively threaded, and nuts (8) are threaded onto the threaded sections.

3. The fixture for bending fatigue testing of photovoltaic cells according to claim 2, characterized in that: A slide rail is fixedly connected to the base (9), and the sliding direction of the slide rail is perpendicular to the upper support rod (1). A first slider is fixedly connected to the bottom of the limiting baffle (7). The first slider is slidably connected to the slide rail, and a positioning component that is detachably connected to the slide rail is provided on the first slider.

4. The fixture for bending fatigue testing of photovoltaic cells according to claim 3, characterized in that: The positioning element includes a first screw that is threadedly connected to the first slider. The slide rail has a plurality of positioning holes along its length, and the first screw is threadedly connected to any of the positioning holes.

5. The fixture for bending fatigue testing of photovoltaic cells according to claim 4, characterized in that: The base (9) is provided with two support frames (5), and the upper support rod (1) and the lower support rod (2) on the support mechanism are fixed to the support frame (5).

6. The fixture for bending fatigue testing of photovoltaic cells according to claim 5, characterized in that: The bottom of the support frame (5) is fixedly connected to a second slider, which is slidably connected to the slide rail. A second screw is threaded onto the second slider, and the second screw is threadedly connected to any of the positioning holes.

7. The fixture for bending fatigue testing of photovoltaic cells according to claim 1, characterized in that: The upper pressure rod (3) and the lower pressure rod (4) are fixedly connected to the pressure rod bracket (6), which is used to connect to the testing machine.

8. The fixture for bending fatigue testing of photovoltaic cells according to claim 1, characterized in that: The distance between the upper support rod (1) and the lower support rod (2) is 3-5cm, and the distance between the upper pressure rod (3) and the lower pressure rod (4) is 0.3-0.5mm.

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