Battery testing device and battery testing method

Abstract

The present application provides a battery testing device and a battery testing method, which relate to the field of battery detection technology. The battery testing device uses transparent conductive glass with high light transmittance and high conductivity to contact the front electrode and the back electrode of the battery. On the one hand, the current can be introduced into the battery cell to achieve conductivity; on the other hand, the structure will not block the infrared camera test image for testing EL and PL, which can reduce the problem of the front and back of the battery being blocked, making the test image more accurate. By using a flat transparent conductive glass as the test surface, the battery can be flattened on the plane of the transparent conductive glass and completely in contact with the glass plane, which can prevent the battery from being pressed unevenly by the probe and causing fragmentation problems. When testing double-sided batteries, the PL can be tested directly from the bottom of the battery. There is no need to replace the probe row, thereby ensuring rapid testing.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery testing device and a battery testing method. Background Art

[0002] EL tester, the full name of which is electroluminescence tester, is a device for detecting internal defects of solar cells or battery modules. It uses the electroluminescence principle of crystalline silicon and a high-resolution CCD (charge coupled device) camera to capture near-infrared images of the modules to obtain and determine the defects of the modules.

[0003] The full name of PL tester is photoluminescence tester: when semiconductor materials are excited by light, electrons make a transition from low energy level to high energy level, generate electron-hole pairs, and form non-equilibrium carriers. After the excited electrons move in the semiconductor for a period of time, they return to a lower energy state and recombine with electron-hole pairs. Non-equilibrium electrons can directly cross the band gap and recombine with valence band holes, or they can be captured in the localized state in the band gap and then recombine with holes. Recombination can be radiative recombination, i.e. luminescence, or non-radiative surface recombination, Auger recombination, and recombination of multiple phonons. During the recombination process, if the electron-hole pairs release excess energy in the form of light, it is called photoluminescence.

[0004] EL testing requires connection with electrodes. Under normal circumstances, wires and probes must be used to press on the electrodes on both sides of the battery cell. PL testing does not require the use of probes for testing. Therefore, the two test methods cannot be completed in the same test bracket. After the EL test is completed, the bracket needs to be replaced, and then the PL image is tested. If the probe row is not replaced, the probe row will block the image of the PL test, thus affecting the test results. There is another problem. In the process of taking images, if you want to get an undistorted image, you need to place the camera above the corresponding center position, but both EL and PL use CCD cameras to take infrared images. However, they use different spectral ranges, so independent cameras must be used. There is no way to place two CCD cameras at the center of the same side of the battery, resulting in distortion of the image taken by one of the cameras. Summary of the invention

[0005] The purpose of the present application is to provide a battery testing device and a battery testing method, so as to implement electroluminescence testing and photoluminescence testing of a battery using the same testing device.

[0006] In a first aspect, an embodiment of the present application provides a battery testing device, comprising a bracket, an imager, and a light source. A first transparent conductive glass and a second transparent conductive glass are provided on the bracket, and a space for accommodating a battery to be tested is provided between the first transparent conductive glass and the second transparent conductive glass, and the first transparent conductive glass, the battery to be tested, and the second transparent conductive glass can form a conductive loop through electrical connection. The imager is configured to capture an image of the battery to be tested. The light source is configured to emit light to the space of the battery to be tested on a side of the battery to be tested away from the imager.

[0007] The battery testing device uses transparent conductive glass with high light transmittance and high conductivity to contact the front and back electrodes of the battery. On the one hand, it can conduct current into the battery cell to achieve conductivity; on the other hand, the structure will not block the infrared camera test image for testing EL and PL, which can reduce the problem of the front and back of the battery being blocked, making the test image more accurate. Using flat transparent conductive glass as the test surface, the battery can be flattened on the transparent conductive glass plane and completely contact the glass plane, which can prevent the battery from being pressed unevenly by the probe and causing fragments. When testing double-sided batteries, the PL can be tested directly from the bottom of the battery. There is no need to replace the probe row, thereby ensuring fast testing.

[0008] Compared with the existing method of pouring current through probes, the current introduction is smoother and the image is clearer because the electrodes on the front and back of the cell have a larger contact area with the conductive layer of the transparent conductive glass. There will be no problem with the probe contact causing a certain area of ​​the cell to be dark or bright, resulting in uneven brightness and affecting the accuracy of the tested image.

[0009] In a possible implementation, the bracket includes a first frame and a second frame, the first transparent conductive glass is arranged in the first frame, the second transparent conductive glass is arranged in the second frame, and a limit block is provided on the surface of the first frame close to the second frame for limiting the position of the battery to be tested relative to the first transparent conductive glass.

[0010] The battery to be tested is limited to a specified position, such as the center position of the first transparent conductive glass, by a limiting block, so as to improve the accuracy of the test image.

[0011] In a possible implementation, the limit block is slidably connected to the first frame, and the limit block is configured to be able to slide relative to the first frame to push the battery to be tested placed on the first transparent conductive glass to move relative to the first transparent conductive glass.

[0012] This structure facilitates the movement of the battery to be tested. The battery to be tested is placed on the edge of the first transparent conductive glass, and then the battery to be tested is moved to the center of the first transparent conductive glass by adjusting the limit block.

[0013] In a possible implementation, the first frame and the second frame are movably connected, and the second frame is configured to be able to move closer to or farther away from the first frame to change the size of the space between the first transparent conductive glass and the second transparent conductive glass.

[0014] This structure facilitates the placement and removal of batteries. Before placing the battery sheet, the second frame is moved away from the first frame. After the battery to be tested is placed on the first transparent conductive glass, the second frame is moved so that the second transparent conductive glass is in complete contact with the upper surface of the battery to be tested.

[0015] In a possible implementation, the first transparent conductive glass and the second transparent conductive glass are single-sided conductive structures, and the conductive layer of the first transparent conductive glass is arranged opposite to the conductive layer of the second transparent conductive glass. This structure enables the first transparent conductive glass, the battery to be tested, and the second transparent conductive glass to be conductive.

[0016] In a possible implementation manner, the first transparent conductive glass and the second transparent conductive glass are respectively connected to the wire through the edge of the conductive layer.

[0017] The connection structure will not block the imaging image and will not affect the accuracy of the test image.

[0018] In a possible implementation, the imager is disposed on a side of the second transparent conductive glass away from the first transparent conductive glass, and corresponds to the center position of the second transparent conductive glass. In a possible implementation, the light source is disposed on a side of the first transparent conductive glass away from the second transparent conductive glass, and corresponds to the center position of the first transparent conductive glass.

[0019] This structure allows the test position to be photographed at the exact center, and the EL and PL images will not be distorted, making it easy for the test results to correspond to the EL or other analysis images of the battery cell.

[0020] In a second aspect, a battery testing method is provided, comprising: when a first transparent conductive glass, a battery to be tested and a second transparent conductive glass form a conductive circuit, using an imager to capture an optical image of the battery to be tested, and / or when the first transparent conductive glass, the battery to be tested and the second transparent conductive glass are electrically disconnected, using a light source to illuminate the battery to be tested, and then using an imager to capture an optical image of the battery to be tested.

[0021] This test method uses transparent conductive glass with high light transmittance and high conductivity to contact the front and back electrodes of the battery, reducing the problem of the front and back of the battery being blocked, making the test image more accurate. The contact area between the transparent conductive glass and the battery is large, making the current introduction smoother and the image clearer. At the same time, by using a flat transparent conductive glass as the test surface, the battery can be flattened on the plane of the transparent conductive glass and completely in contact with the glass plane, which can prevent the battery from being pressed unevenly by the probe and causing fragments. This test method can achieve EL testing and PL testing of double-sided batteries without moving the battery or replacing the test bracket. It is easy to operate and has high detection efficiency.

[0022] In a possible implementation, an imager is disposed on a side of the second transparent conductive glass away from the first transparent conductive glass, and a light source is disposed on a side of the first transparent conductive glass away from the second transparent conductive glass, including: placing a bifacial battery to be tested on the first transparent conductive glass, adjusting the second frame so that the second transparent conductive glass is in full contact with the bifacial battery to be tested; turning on a power supply so that the first transparent conductive glass, the bifacial battery to be tested, and the second transparent conductive glass can form a conductive loop through electrical connection, and the imager captures an image of the bifacial battery to be tested; when the first transparent conductive glass, the bifacial battery to be tested, and the second transparent conductive glass are electrically disconnected, turning on the light source so that light is irradiated on the bifacial battery to be tested, and using the imager to capture an image of the bifacial battery to be tested.

[0023] In the actual detection process, the test sequence can be adjusted as needed, such as first making an electrical connection, capturing the image of the bifacial cell to be tested, then disconnecting the electrical connection, illuminating it and capturing the image of the bifacial cell to be tested, or first illuminating it and capturing the image of the bifacial cell to be tested, then turning off the light source, making an electrical connection, and capturing the image of the bifacial cell to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a battery testing device provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of a first frame and a first transparent conductive glass provided in an embodiment of the present application.

[0027] Icons: 10 - double-sided battery to be tested; 20 - wire; 100 - battery testing device; 110 - bracket; 111 - first frame; 112 - second frame; 113 - first transparent conductive glass; 114 - second transparent conductive glass; 115 - limit block; 120 - imager; 130 - light source. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] The structure of the EL test machine currently used for testing cells is generally that the top is a CCD camera specifically used for testing the light source, the bottom is placed on a test stand, the cell is located between the test stands, and there is a set of corresponding test probe rows on the top and bottom, and the probe rows are in contact with the front and back electrodes of the cell. When negative electricity is introduced to the front and positive electricity is introduced to the back, the cell will produce electroluminescence, and various defects inside the cell will be tested. The shortcomings of the existing EL test include the following aspects:

[0031] 1. The EL tester can only test EL (electroluminescence) alone. If you need to test PL (photoluminescence), you need to disassemble the probe row, so the operation is more troublesome and will seriously affect the test time.

[0032] 2. In the common PL and EL combined devices, the pictures taken will be distorted. This is because the PL and EL cameras are both on the upper side, but the photo positions cannot be taken into account, so only one EL or PL camera can be located directly above the battery cell, and the other camera can only be placed side by side. This distorted EL or PL image is very unfavorable for analyzing the structure of the battery cell. The distorted EL and PL images cannot correspond to the position of the battery cell, which makes the analysis difficult.

[0033] 3. When using probes to test EL, a large number of probes are needed to press the cell up and down, which can easily cause fragmentation. Moreover, the thickness of the cell in the industry is getting thinner and thinner, approaching 160 microns, and the size of the cell is getting larger and larger, and large-size cells with a side length of 210mm are gradually becoming popular, so it is very easy to cause fragmentation during the EL test. Moreover, thinner and larger cell sheets are also easy to bend on the track, so they are also easily scratched by metal probes, resulting in poor electrical performance and appearance.

[0034] 4. When using a metal probe to test EL, the probe is prone to poor contact after a period of use, so a new probe needs to be replaced, increasing the cost of the equipment.

[0035] 5. When using a metal probe to test EL, if the cell is placed on the track with a slight deviation, the probe will easily fail to press down on the electrode of the cell, causing the current to not be normally introduced into the cell, so the tested EL image will not be clear enough or even fail to be photographed.

[0036] In view of the above technical problems, the present application adopts transparent conductive glass as the electrode in contact with the double-sided battery. On the one hand, it can ensure that the back side is completely not blocked by the probe row, etc., which increases the accuracy of the EL image test, and can also test the PL image on the back side of the battery cell at the same time. On the other hand, the battery cell is completely flat and pressed on the conductive glass, and is not easy to be crushed. In particular, the large-sized 210mm diameter battery cells in the industry are more easily bent in the test machine due to the influence of gravity, so it is more suitable to use the test device provided by this application.

[0037] Some implementation methods of the present application are described in detail below in conjunction with the accompanying drawings.

[0038] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the battery testing device 100 provided in this embodiment.

[0039] This embodiment provides a battery testing device 100, including a support 110, an imager 120 and a light source 130. The support 110 is used to place a bifacial battery 10 to be tested, and the imager 120 and the light source 130 are used to test the bifacial battery 10 to be tested placed on the support 110.

[0040] The bracket 110 includes a first frame 111 and a second frame 112 that are arranged opposite to each other. A first transparent conductive glass 113 is arranged in the first frame 111, and a second transparent conductive glass 114 is arranged in the second frame 112. The present application adopts transparent conductive glass, which takes advantage of its high light transmittance and high conductivity to replace the test probe of the prior art. There is a gap between the first transparent conductive glass 113 and the second transparent conductive glass 114 for accommodating the bifacial battery 10 to be tested. The battery is placed on the first transparent conductive glass 113 or the second transparent conductive glass 114. The first transparent conductive glass 113, the bifacial battery 10 to be tested and the second transparent conductive glass 114 can form a conductive loop through electrical connection. This embodiment is described by taking the example that the first frame 111 is arranged at the bottom and the second frame 112 is arranged at the top.

[0041] In some embodiments of the present application, the first transparent conductive glass 113 and the second transparent conductive glass 114 are single-sided conductive structures, and the conductive layer of the first transparent conductive glass 113 is arranged opposite to the conductive layer of the second transparent conductive glass 114. The conductive layer of the first transparent conductive glass 113 and the conductive layer of the second transparent conductive glass 114 are respectively in contact with the two surfaces of the bifacial battery 10 to be tested, thereby achieving conductivity.

[0042] Please refer to Figure 2 , Figure 2 Schematic diagram of the structure of the first frame 111 and the first transparent conductive glass 113. In some embodiments of the present application, the first transparent conductive glass 113 and the second transparent conductive glass 114 are respectively connected to the wire 20 through the edge of their conductive layer, and the current is connected through the wire 20 to form a conductive loop.

[0043] In order to facilitate the placement of the battery cells, the first frame 111 and the second frame 112 in the embodiment of the present application are movably connected, that is, the first frame 111 and the second frame 112 can move relative to each other to change the size of the space between the first transparent conductive glass 113 and the second transparent conductive glass 114. The specific connection method is a common technology in the field and is not limited in this application. Before placing the bifacial battery 10 to be tested, move the second frame 112 away from the first frame 111. After placing the bifacial battery 10 to be tested on the first transparent conductive glass 113, move the second frame 112 so that the second transparent conductive glass 114 is in full contact with the upper surface of the bifacial battery 10 to be tested.

[0044] In order to limit the position of the bifacial battery 10 to be tested, the bifacial battery 10 to be tested is located in the middle of the first transparent conductive glass 113 to obtain a clear image. A limit block 115 is provided on the surface of the first frame 111 close to the second frame 112, which is used to limit the position of the bifacial battery 10 to be tested relative to the first transparent conductive glass 113. As an implementation method, the limit block 115 is slidably connected to the first frame 111, and the limit block 115 is configured to be able to slide relative to the first frame 111 to push the bifacial battery 10 to be tested placed on the first transparent conductive glass 113 to move relative to the first transparent conductive glass 113. That is, by adjusting the position of the limit block 115 to change its limited size, the battery cells of different sizes can be limited. At the same time, the bifacial battery 10 to be tested can be placed on the edge of the first transparent conductive glass 113 first, and then the limit block 115 is adjusted to move the bifacial battery 10 to be tested to the center of the first transparent conductive glass 113. In some embodiments of the present application, the limit block 115 is slidably connected to the first frame 111 through a clamp and a slot. The limit block 115 is an L-shaped structure, one end of the limit block 115 is slidably connected to the first frame 111, and the other end can penetrate into the space between the first transparent conductive glass 113 and the second transparent conductive glass 114 to push the double-sided battery 10 to be tested. In other embodiments of the present application, a connection method with the same function can be used to achieve a sliding connection, which is not limited in the present application. In an embodiment of the present application, two limit blocks 115 are respectively provided on the four frames of the first frame 111. In other embodiments of the present application, the number and shape of the limit blocks 115 can be adjusted as needed.

[0045] The imager 120 and the light source 130 are respectively disposed on both sides of the first transparent conductive glass 113 and the second transparent conductive glass 114 to test the bifacial cell 10 to be tested placed between the first transparent conductive glass 113 and the second transparent conductive glass 114. In this embodiment, the imager 120 is disposed above the second transparent conductive glass 114, and the light source 130 is disposed below the first transparent conductive glass 113.

[0046] Furthermore, in order to improve the accuracy of imaging and avoid image distortion, the imager 120 and the light source 130 are respectively arranged corresponding to the center position of the first transparent conductive glass 113 and the center position of the second transparent conductive glass 114. In this embodiment, the first frame 111 and the second frame 112 are of the same size, the first transparent conductive glass 113 and the second transparent conductive glass 114 are of the same size, and the first frame 111 and the second frame 112 are completely opposite and horizontally arranged. As an implementation method, the upper part of the second transparent conductive glass 114 is a camera for testing EL, and the lower part of the first transparent conductive glass 113 is a camera for testing PL. By using transparent conductive glass, the test process of testing EL and PL is concentrated in one test bracket 110, and the upper part tests the EL image and the lower part tests the PL image. When testing the EL image of the battery, the upper electrode is connected to the negative electrode and the lower part is connected to the positive electrode, and the current is connected. The EL dedicated camera on the upper part is used to test the EL image. When testing the PL image of a double-sided cell, there is no need to move the first transparent conductive glass 113 and the second transparent conductive glass 114, and there is no need to connect current. After the cell is irradiated with the infrared laser, a PL infrared camera is used to directly take a picture of the cell.

[0047] Working principle:

[0048] In the present application, the first transparent conductive glass 113 and the second transparent conductive glass 114 are in full contact with both sides of the bifacial battery, and a conductive circuit is formed after the current is connected. The electroluminescence principle of crystalline silicon is used, and an imager 120 (a high-resolution CCD camera) is used to take a near-infrared image on one side of the bifacial battery 10 to be tested, and the defects of the bifacial battery 10 to be tested are obtained and determined, so as to achieve EL testing of the battery. Since the first transparent conductive glass 113 and the second transparent conductive glass 114 have high light transmittance, and there are no components near the bifacial battery to block the battery surface, the battery can be moved without moving the battery, and the current does not need to be connected. A light source 130 is directly set on the other side of the bifacial battery 10 to emit light to the battery, and a test image is obtained through the imager 120 to achieve PL testing of the battery.

[0049] The beneficial effects of this application include:

[0050] (1) The test bracket 110 provided in the present application uses a transparent conductive glass with high light transmittance and high conductivity to contact the front electrode and the back electrode of the battery. On the one hand, the current can be introduced into the interior of the battery cell to achieve conductivity; on the other hand, the structure will not block the infrared camera test image of the EL and PL test, which can reduce the problem of the front and back of the battery being blocked, making the test image more accurate.

[0051] (2) Compared with the existing method of pouring current through probes, the current introduction is smoother and the image is clearer because the electrodes on the front and back of the cell have a larger contact area with the conductive layer of the transparent conductive glass. There will be no problem with the contact of the probes causing a certain area of ​​the cell to be dark or bright, resulting in uneven brightness and affecting the accuracy of the tested image.

[0052] (3) Using a flat transparent conductive glass as the test surface, the battery can be flattened on the transparent conductive glass plane and completely in contact with the glass plane, which can prevent the battery from being pressed unevenly by the probe and causing fragmentation. Especially as the size of batteries is getting bigger and bigger, the size of the battery cell has reached 210mm, and the size of the battery cell in the future may be even larger. The battery cell is more likely to bend under the action of gravity, and the fragmentation rate will be higher.

[0053] (4) When testing bifacial cells, the present application can directly test the PL from the bottom of the cell. There is no need to replace the probe row, thus ensuring fast testing. It can also ensure that the test position from the bottom is shot in the exact center, and the PL image will not be distorted, making it easier for the test results to correspond to the EL or other analysis images of the cell.

[0054] (5) The test device provided in the present application can also be used as a reverse-bias infrared detection instrument. When used, it can be placed under the test bracket 110, and transparent conductive glass can be used as the electrodes on the front and back of the battery to introduce positive and negative charges respectively, test its infrared image, and analyze the possible abnormal reasons in the corresponding areas of the bifacial battery 10 to be tested.

[0055] The present application also provides a battery testing method, which uses the above-mentioned battery testing device 100 to test a battery, including: when the first transparent conductive glass 113, the bifacial battery to be tested 10 and the second transparent conductive glass 114 form a conductive loop, using an imager 120 to capture an image of the bifacial battery to be tested 10, and / or when the first transparent conductive glass 113, the bifacial battery to be tested 10 and the second transparent conductive glass 114 are electrically disconnected, using a light source 130 to illuminate the battery to be tested, and then using the imager 120 to capture an image of the bifacial battery to be tested 10.

[0056] As an implementation method, the bifacial cell 10 to be tested is placed on the first transparent conductive glass 113, and the second frame 112 is adjusted so that the second transparent conductive glass 114 is in full contact with the bifacial cell 10 to be tested; the power is turned on so that the first transparent conductive glass 113, the bifacial cell 10 to be tested, and the second transparent conductive glass 114 can form a conductive loop through electrical connection; the imager 120 receives the light signal emitted by the bifacial cell 10 to perform an electroluminescence test.

[0057] After the test, there is no need to move the battery. When the first transparent conductive glass 113, the bifacial battery to be tested 10 and the second transparent conductive glass 114 are electrically disconnected, the light source 130 is turned on to allow infrared light to irradiate the bifacial battery to be tested 10, and the imager 120 receives the light signal emitted by the bifacial battery to be tested 10 to perform a photoluminescence test.

[0058] The battery testing method is easy to operate and can implement EL testing and PL testing of the battery without moving the battery and replacing the test bracket 110. The test result of the test method is accurate and it is not easy to cause fragmentation.

[0059] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery testing device, characterized in that: include: A bracket, wherein a first transparent conductive glass and a second transparent conductive glass are provided on the bracket, a space for accommodating a battery to be tested is provided between the first transparent conductive glass and the second transparent conductive glass, and the first transparent conductive glass, the battery to be tested and the second transparent conductive glass can form a conductive loop through electrical connection; the battery to be tested is a double-sided battery; The first transparent conductive glass and the second transparent conductive glass are single-sided conductive structures, and the conductive layer of the first transparent conductive glass is arranged opposite to the conductive layer of the second transparent conductive glass; An imager configured to capture an image of the battery to be tested; the imager includes a camera for testing EL and a camera for testing PL; The camera for testing EL is located above the second transparent conductive glass, and the camera for testing PL is located below the first transparent conductive glass; as well as The light source is configured to emit light toward the space of the battery to be tested at a side of the battery to be tested away from the imager; the light source is arranged below the first transparent conductive glass.

2. The battery testing device according to claim 1, characterized in that: The bracket includes a first frame and a second frame, the first transparent conductive glass is arranged in the first frame, and the second transparent conductive glass is arranged in the second frame. A limit block is provided on the surface of the first frame close to the second frame, which is used to limit the position of the battery to be tested relative to the first transparent conductive glass.

3. The battery testing device according to claim 2, characterized in that: The limit block is slidably connected to the first frame, and the limit block is configured to be able to slide relative to the first frame to push the battery to be tested placed on the first transparent conductive glass to move relative to the first transparent conductive glass.

4. The battery testing device according to claim 2 or 3, characterized in that: The first frame and the second frame are movably connected, and the second frame is configured to be able to move closer to or farther away from the first frame to change the size of the space between the first transparent conductive glass and the second transparent conductive glass.

5. The battery testing device according to claim 1, characterized in that: The first transparent conductive glass and the second transparent conductive glass are respectively connected to the wires through the edges of their respective conductive layers.

6. The battery testing device according to claim 1, characterized in that: The imager is arranged on a side of the second transparent conductive glass away from the first transparent conductive glass and corresponds to a center position of the second transparent conductive glass.

7. The battery testing device according to claim 6, characterized in that: The light source is disposed on a side of the first transparent conductive glass away from the second transparent conductive glass and corresponds to a center position of the first transparent conductive glass.

8. A battery testing method, characterized in that: The battery is tested using the battery testing device according to any one of claims 1 to 7, comprising: in a state where the first transparent conductive glass, the battery to be tested and the second transparent conductive glass form a conductive loop, using the imager to capture an optical image of the battery to be tested, and / or in a state where the first transparent conductive glass, the battery to be tested and the second transparent conductive glass are electrically disconnected, using the light source to illuminate the battery to be tested, and then using the imager to capture an optical image of the battery to be tested.

9. The battery testing method according to claim 8, characterized in that: The imager is arranged on a side of the second transparent conductive glass away from the first transparent conductive glass, and the light source is arranged on a side of the first transparent conductive glass away from the second transparent conductive glass, comprising: Placing the bifacial battery to be tested on the first transparent conductive glass, adjusting the second transparent conductive glass to be in full contact with the bifacial battery to be tested; turning on the power supply so that the first transparent conductive glass, the bifacial battery to be tested and the second transparent conductive glass can form a conductive loop through electrical connection, and the imager captures the optical image of the bifacial battery to be tested; When the first transparent conductive glass, the bifacial battery to be tested and the second transparent conductive glass are electrically disconnected, the light source is turned on to irradiate the bifacial battery to be tested, and the imager is used to capture an image of the bifacial battery to be tested.

Images