Battery piece testing device
By setting up a light-blocking plate and a laser in the solar cell testing device, the problem of inaccurate detection caused by probe obstruction was solved, and high-precision detection of solar cells was achieved.
Patent Information
- Application Number
- CN202422873933.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-22
AI Technical Summary
In existing technologies, probe arrays can obstruct electroluminescence images captured during online detection, resulting in shielded areas in the detection images and affecting detection accuracy.
A battery cell testing device was designed, including a support frame, a light-blocking plate, a laser, a probe unit, and an image acquisition unit. By setting a blocking area for the laser incident on the probe unit and using the light-blocking plate to limit the range of the laser beam, the front of the battery cell under test is ensured to be unobstructed. The probe unit provides current to the battery cell to make it emit light, and the image acquisition unit acquires the emitting image in real time.
It effectively reduces the error caused by laser obstruction, improves the accuracy of detection, protects important areas from interference from other factors, and ensures the reliability of detection results.
Smart Images
Figure CN223652227U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field especially relates to a testing arrangement of battery piece. BACKGROUND
[0002] In prior art, the multiple probes in the probe row group are usually welded on a copper pipe, which makes the shadow on the online detection shooting electroluminescence (EL) picture larger, and is not conducive to the detection of the battery piece. SUMMARY
[0003] The utility model provides a testing arrangement of battery piece to solve the problem of the probe row group existing in the prior art to the online detection shooting and causing the detection image to appear shielding area to influence the detection accuracy.
[0004] According to the provided testing arrangement of battery piece, it comprises support frame, light barrier, laser, probe unit and image acquisition unit;
[0005] The light barrier is arranged around the support frame, and the support frame is used for placing the battery piece to be detected;
[0006] The laser is arranged on the support frame and is used for emitting laser beams to the surface of the battery piece to be detected;
[0007] The probe unit is used for providing current for the battery piece to be detected during the test, so that the battery piece to be detected emits light;The image acquisition unit is used for acquiring the light emitting image of the battery piece to be detected.
[0008] Optionally, the projection of the light barrier along the thickness direction of the battery piece to be detected on the plane where the battery piece to be detected is located surrounds the battery piece to be detected.
[0009] Optionally, the projection of the light barrier along the thickness direction of the battery piece to be detected on the plane where the battery piece to be detected is located is a rectangle.
[0010] Optionally, the probe unit comprises a control unit, a probe group and a conductive part;
[0011] The probe group is electrically connected with the conductive part;
[0012] The control unit is fixedly connected with the probe group and is used for controlling the movement of the probe group;
[0013] The control unit comprises a control circuit, the control circuit is electrically connected with the probe group and the conductive part respectively, and is used for supplying power to the probe group and the conductive part to form a loop.
[0014] Optionally, the probe group comprises a probe shaft sleeve, a probe head and a probe clamp;
[0015] The probe shaft sleeve is fixedly connected with the probe clamp;The probe head is detachably connected at one end of the probe shaft sleeve;
[0016] The control unit is fixedly connected with the probe clamp, and the control circuit is electrically connected with the probe head.
[0017] Optionally, the number of probe clamps is the same as the number of grid lines of the battery piece to be tested along the first direction.
[0018] Each probe clamp is connected with a probe head, the probe clamps are arranged and connected along the first direction, and the minimum distance between adjacent probe heads is the same as the minimum distance between adjacent grid lines, wherein the first direction is the arrangement direction of the grid lines of the battery piece to be tested.
[0019] Optionally, the testing device further comprises probe clamps arranged along a second direction, and the adjacent probe clamps are arranged at intervals along the second direction.
[0020] Optionally, the first direction and the second direction are perpendicular in the plane where the battery piece to be tested is located.
[0021] Optionally, each probe clamp is connected with a plurality of probe heads.
[0022] The probe heads are arranged at intervals on the probe clamp, and the interval distance is the same as the minimum distance between adjacent grid lines.
[0023] Optionally, the testing device further comprises a connector.
[0024] The conductive part and the control circuit are electrically connected through the connector.
[0025] Optionally, the probe shaft sleeve comprises a sliding block on the side away from the battery piece to be tested.
[0026] The probe clamp comprises a limiting groove, and the probe shaft sleeve is fixed in the limiting groove through the sliding block.
[0027] The technical scheme of the utility model, through setting up support frame, light barrier, laser, probe unit and image acquisition unit in battery piece testing device, through setting up laser incident probe unit shielding area, using light barrier to limit the range of laser beam, ensure that the front of the battery piece to be tested can be scanned by laser and there is no shielding, greatly reduce the probability of result error caused by laser shielding probe wheel, improve the accuracy, increase the light barrier to protect the important places in the detection area from being disturbed by other factors and cause inaccurate results.
[0028] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS
[0029] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort should belong to the protection scope of the present application.
[0030] Figure 1 is a structural schematic diagram of a battery piece testing device according to the embodiments of the present application,
[0031] Figure 2 is a structural schematic diagram of a probe unit according to the embodiments of the present application,
[0032] Figure 3 is a connection schematic diagram of a probe unit according to the embodiments of the present application,
[0033] Figure 4 is a principle schematic diagram of a first probe unit according to the embodiments of the present application,
[0034] Figure 5 is a principle schematic diagram of a second probe unit according to the embodiments of the present application,
[0035] Figure 6 is a principle schematic diagram of a third probe unit according to the embodiments of the present application. DETAILED DESCRIPTION
[0036] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort should belong to the protection scope of the present application.
[0037] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0038] Figure 1 is a structural schematic diagram of a battery piece testing device according to the embodiments of the present application, Figure 2It is a structure schematic diagram of a probe unit according to the embodiment of the utility model. As shown in Figure 1 And Figure 2 The test device comprises:
[0039] Support frame 1, light barrier 2, laser 3, probe unit 4 and image acquisition unit 5;
[0040] The light barrier 2 is arranged around the support frame 1, and the support frame 1 is used for placing the battery piece 6 to be tested;
[0041] The laser 3 is arranged on the support frame 1 and is used for emitting a laser beam to the surface of the battery piece 6 to be tested;
[0042] The probe unit 4 is used for providing a current for the battery piece 6 to be tested during the test, so that the battery piece 6 to be tested emits light; and the image acquisition unit 5 is used for acquiring the light-emitting image of the battery piece 6 to be tested.
[0043] In some embodiments, the support frame 1 further comprises a substrate, and the battery piece 6 to be tested is placed on the substrate to ensure that the battery piece 6 to be tested is stably placed horizontally.
[0044] In some embodiments, the light barrier 2 is arranged around the support frame 1, and the battery piece 6 to be tested is arranged in the region surrounded by the light barrier 2, so that the light barrier 2 reduces light interference on the battery piece 6 to be tested and ensures imaging quality.
[0045] In some embodiments, the laser 3 can be used for emitting a laser beam, and the laser 3 is arranged above the battery piece 6 to be tested and on the support frame 1, so that the laser 3 can emit a laser beam to the battery piece 6 to be tested.
[0046] In some embodiments, the test device for the battery piece in the utility model embodiment adopts EL detection, and the main mode is that a forward current slightly higher than the short-circuit current of the solar cell is first applied to the solar cell, the current excites the electrons in the solar cell, so that the electrons jump to a high-energy level state, and then emit light; by acquiring the light-emitting image of the solar cell, the defects in the solar cell can be judged, and the detection of the solar cell can be realized. Therefore, the probe unit 4 in the utility model embodiment can be used for providing a current for the battery piece 6 to be tested, so that the battery piece 6 to be tested emits light; specifically, a current can be provided to the grid line of the battery piece 6 to be tested, so that the battery piece 6 to be tested emits light; at the same time, the image acquisition unit 5 is arranged above the battery piece 6 to be tested, the light-emitting image of the battery piece 6 to be tested during the detection process is acquired in real time, and the purpose of detecting the battery piece 6 to be tested is achieved.
[0047] It can be understood that, since the image acquisition module and the probe unit 4 are both arranged above the battery piece 6 to be tested, the image acquisition unit 5 is used to acquire the overall image of the battery piece 6 to be tested, and the probe unit 4 provides the current at the corresponding position of the grid line, so it is inevitable to shield the battery piece 6 to be tested, so that the light-emitting image acquired by the image acquisition unit 5 has a shadow, which affects the detection accuracy of the battery piece 6 to be tested, and therefore the laser 3 is arranged, and during the detection process, the laser continuously illuminates the battery piece 6 to be tested, so that the area shielded by the probe unit 4 is illuminated by the laser beam, and then the light-emitting image acquired by the image acquisition unit 5 is unshielded, thereby ensuring the accuracy of the test of the battery piece 6 to be tested.
[0048] In some embodiments, the direction of the laser 3 can be adjusted according to the position of the probe unit 4, for example, there is a certain angle between the angle at which the probe unit 4 is arranged and the direction of the laser 3, so as to ensure that the front surface of the battery piece 6 to be tested can be scanned by the laser beam without being shielded.
[0049] Specifically, the battery piece 6 to be tested is arranged on the support frame 1, the laser 3, the probe unit 4 and the image acquisition unit 5 are turned on, the laser beam emitted by the laser 3 is incident on the battery piece 6 to be tested, the laser beam incident on the light shield plate 2 is absorbed, and only the area around the support plate is illuminated, thereby covering the surface of the battery piece 6 to be tested. The probe unit 4 provides the current for the battery piece 6 to be tested in real time, the battery piece 6 to be tested emits light, and the image acquisition module acquires the light-emitting image of the battery piece 6 to be tested, thereby detecting the battery piece 6 to be tested.
[0050] The technical scheme of the embodiment of the utility model discloses a support frame, a light shield plate, a laser, a probe unit and an image acquisition unit are arranged in the battery piece testing device, the laser is arranged to be incident on the shielding area of the probe unit, the light shield plate is used to limit the range of the laser beam, so that the front surface of the battery piece to be tested can be scanned by the laser without being shielded, the probability of result error caused by the shielding of the laser on the probe wheel is greatly reduced, and the accuracy is improved.
[0051] Optionally, continuing to refer to Figure 1 As shown in the figure, the light shield plate 2 surrounds the battery piece 6 to be tested in the projection of the thickness direction Z of the battery piece 6 to be tested in the plane of the battery piece 6 to be tested.
[0052] As shown in the drawings, the light barrier 2 is arranged around the support frame 1, and the support frame 1 is used for placing the battery piece 6 to be measured, so that the projection of the light barrier 2 along the thickness direction Z of the battery piece 6 to be measured in the plane where the battery piece 6 to be measured is located surrounds the battery piece 6 to be measured, thereby ensuring that the laser beam incident on the light barrier 2 is absorbed, and the laser beam not absorbed by the light barrier 2 is located on the support frame 1, thereby ensuring the quality of laser scanning of the battery piece 6 to be measured. Moreover, the light barrier 2 is arranged around the battery piece 6 to be measured to play a protection role, protects the detection environment of the battery piece 6 to be measured from being interfered by other factors, and ensures the accuracy of the detection result.
[0053] In some embodiments, with continued reference to Figure 1 As shown in the drawings, the projection of the light barrier 2 along the thickness direction of the battery piece 6 to be measured in the plane where the battery piece 6 to be measured is located is a rectangle. Wherein, since the shape of the battery piece 6 to be measured can be a rectangle, the shape of the light barrier 2 is set to a rectangle, thereby ensuring the surrounding effect of the light barrier 2 and facilitating the arrangement.
[0054] The technical scheme of the embodiment of the utility model, through setting the projection of the light barrier along the thickness direction of the battery piece to be measured in the plane where the battery piece to be measured is located surrounds the battery piece to be measured, so that the laser beam is only located in the surrounding area of the light barrier, thereby ensuring the laser scanning effect of the battery piece to be measured, and the light barrier is arranged around the battery piece 6 to be measured to play a protection role, protects the detection environment of the battery piece to be measured from being interfered by other factors, and ensures the accuracy of the detection result.
[0055] Optionally, Figure 3 is a connection diagram of a probe unit according to the embodiment of the utility model, which is combined with Figure 2 and Figure 3 As shown in the drawings, the probe unit 4 comprises a control unit 41, a probe group 42 and a conductive part 43;
[0056] The probe group 42 is electrically connected with the conductive part 43;
[0057] The control unit 41 is fixedly connected with the probe group 42, and is used for controlling the movement of the probe group 42;
[0058] The control unit 41 comprises a control circuit 411, and the control circuit 411 is electrically connected with the probe group 42 and the conductive part 43 respectively, and is used for supplying power to the probe group 42 and the conductive part 43 to form a loop.
[0059] Wherein, the control unit 41 comprises a control circuit 411, and the control current is electrically connected with the probe group 42 and the conductive part 43 respectively to form a complete current loop. The control unit 41 can also control the movement of the probe group 42, thereby providing current for different regions on the battery piece 6 to be measured.
[0060] Specifically, the probe group 42 is electrically connected with the conductive part 43, a control current is connected with the probe group 42 and the conductive part 43 respectively, the control unit 41 controls the probe group 42 to move to the corresponding grid line, and the control circuit 411 provides a battery to the probe group 42 and the conductive part 43, so that the grid line is electrified, and then the battery piece 6 to be detected is lighted, and normal detection is ensured.
[0061] The technical scheme of the embodiment of the utility model, through setting control unit, probe group and conductive part in probe unit, electrically connecting probe group and conductive part, fixedly connecting control unit and probe group, electrically connecting control circuit with probe group and conductive part respectively, for supplying power to probe group and conductive part to form a loop, guaranteeing the smooth progress of detection process.
[0062] Optionally, continuing to refer to Figure 2 And Figure 3 As shown, the probe group 42 comprises a probe shaft sleeve 421, a probe head 422 and a probe clamp 423.
[0063] The probe shaft sleeve 421 is fixedly connected with the probe clamp 423; the probe head 422 is detachably connected at one end of the probe shaft sleeve 421.
[0064] The control unit 41 is fixedly connected with the probe clamp 423; and the control circuit 411 is electrically connected with the probe head 422.
[0065] Among them, the probe head 422 is arranged in the probe shaft sleeve 421, the probe clamp 423 is used for fixing the probe shaft sleeve 421, the probe head 422 is detachably arranged in the probe shaft sleeve 421, and the reliability and accuracy of detection can be ensured by regularly replacing the probe head 422 in the probe shaft sleeve 421. The control circuit 411 is electrically connected with the probe head 422, when the probe head 422 contacts with the grid line, the electrical connection with the grid line is realized, and then the current is provided for the battery piece 6 to be detected.
[0066] Among them, the probe clamp 423 is fixedly connected with the probe shaft sleeve 421, the control unit 41 is fixedly connected with the probe clamp 423, the control unit 41 can drive the probe clamp 423 to move, and then the fixed position of the current of the probe head 422 on the battery piece 6 to be detected is ensured.
[0067] It can be understood that each probe shaft sleeve 421 only comprises one probe head 422, and each probe clamp 423 can comprise a plurality of probe shaft sleeves 421 or one probe shaft sleeve 421.
[0068] Specifically, the probe set 42 includes a probe shaft sleeve 421, a probe head 422 and a probe clamp 423, the probe shaft sleeve 421 is fixedly connected with the probe clamp 423, and the probe head 422 is detachably connected at one end of the probe shaft sleeve 421. The control unit 41 is fixedly connected with the probe clamp 423, the control circuit 411 is electrically connected with the probe head 422, the control unit 41 drives the probe clamp 423 to move and then drives the probe head 422 in the probe shaft sleeve 421 to move, so that the probe head 422 contacts the grid line, the control circuit 411 is electrically connected with the probe head 422, so that when the probe head 422 contacts the grid line, the battery piece 6 to be tested provides current.
[0069] The technical scheme of the embodiment of the utility model, through setting up probe set including probe shaft sleeve, probe head and probe clamp, probe shaft sleeve and probe clamp fixed connection, probe head detachable connection in one end of probe shaft sleeve, control unit and probe clamp fixed connection, control circuit and probe head electric connection, guarantee the accuracy and reliability in the detection process.
[0070] Optionally, Figure 4 It is the principle diagram of the first probe unit according to the embodiment of the utility model, and the principle diagram of the first probe unit is combined with Figure 2 And Figure 4 As shown in the figure, along the first direction X, the number of probe clamps 423 is the same as the number of grid lines 61 of the battery piece 6 to be tested.
[0071] Each probe clamp 423 is connected with a probe head 422; the probe clamps 423 are arranged and connected along the first direction X, and the minimum distance between adjacent probe heads 422 is the same as the minimum distance between adjacent grid lines 61; wherein, the first direction X is the arrangement direction of the grid lines 61 of the battery piece 6 to be tested.
[0072] Wherein, since the grid lines 61 arranged along the first direction X exist on the battery piece 6 to be tested, a plurality of grid lines 61 are arranged in parallel, so that a plurality of probe clamps 423 can be arranged in the detection process of the testing device, each probe clamp 423 is connected with a probe head 422, the probe clamps 423 are arranged and connected along the first direction X, and the minimum distance between adjacent probe heads 422 is the same as the minimum distance between adjacent grid lines 61, so that each probe head 422 contacts a grid line 61 and can simultaneously act on the battery piece 6 to be tested, simultaneously provides current for all grid lines 61, and guarantees the detection effect.
[0073] Exemplarily, the battery piece 6 to be tested has five grid lines 61 arranged along the first direction X and extending along the second direction Y. The test device further includes five probe clamps 423 arranged along the first direction X and connected to each other, each of the probe clamps 423 has a probe shaft sleeve 421, and each of the probe shaft sleeves 421 has a probe head 422. The control unit 41 controls the probe clamps 423 to move to the battery piece 6 to be tested, and ensures that each of the probe heads 422 contacts a grid line 61, so that all the grid lines 61 are electrified at the same time, and the simultaneity and accuracy of the detection process are ensured.
[0074] The technical scheme of the embodiment of the utility model, through setting the same number of probe clamps as the grid lines of the battery piece to be tested, connecting each probe clamp with a probe head, arranging the probe clamps along the first direction X and connecting them to each other, and ensuring that the minimum distance between adjacent probe heads is the same as the minimum distance between adjacent grid lines, the accuracy of the detection process is ensured.
[0075] Optionally, continuing to refer to Figure 4 and Figure 2 , the test device further includes probe clamps 423 arranged along the second direction Y, and the adjacent probe clamps 423 are arranged at intervals along the second direction Y.
[0076] Among them, in the plane where the battery piece 6 to be tested is located, the first direction X and the second direction Y are perpendicular.
[0077] Among them, the second direction Y can be the extension direction of the grid line 61. The test device further includes probe clamps 423 arranged along the second direction Y, and the adjacent probe clamps 423 are arranged at intervals along the second direction Y, so that there is a probe head 422 contacting the grid line 61 at a certain distance on the same grid line 61. In some embodiments, the distance between the adjacent probe clamps 423 along the second direction Y can also be the same, so that there is a probe head 422 at a fixed distance along the second direction Y, ensuring the uniformity of the light emission of the battery piece 6 to be tested, and ensuring the accuracy and reliability of the detection process.
[0078] The technical scheme of the embodiment of the utility model, by setting the probe clamps arranged along the second direction in the test device and arranged at intervals between the adjacent probe clamps along the second direction, there is a probe head at a fixed distance along the second direction, and there is also a probe head on each grid line along the first direction, ensuring the uniformity of the light emission of the battery piece to be tested, and ensuring the accuracy and reliability of the detection process.
[0079] Optionally, Figure 5 is a principle schematic view of a second probe unit according to the embodiment of the utility model, in combination with Figure 5 and Figure 2 , each of the probe clamps 423 is connected to a plurality of probe heads 422.
[0080] The probe heads 422 are arranged on the probe holder 423 at intervals and the interval distance is the same as the minimum distance between the adjacent grid lines 61.
[0081] The probe heads 422 are arranged on the probe holder 423 at intervals and the interval distance is the same as the minimum distance between the adjacent grid lines 61.
[0082] It can be understood that each probe holder 423 is connected with the plurality of probe heads 422, and a plurality of probe holders 423 are arranged in the second direction Y, so that the probe heads 422 exist in the first direction X and the second direction Y, and can act on the surface of the battery sheet 6 to be detected at the same time, thereby ensuring the accuracy of the detection process.
[0083] The technical scheme of the embodiment of the utility model, each probe holder is connected with the plurality of probe heads, the probe heads are arranged on the probe holder at intervals and the interval distance is the same as the minimum distance between the adjacent grid lines, which simplifies the testing device and ensures the accuracy of the detection process.
[0084] Optionally, the testing device further comprises a connector (not shown in the figure).
[0085] The conductive part 43 and the control circuit 411 are electrically connected through the connector.
[0086] The testing device further comprises a connector, and the conductive part 43 and the control circuit 411 are electrically connected through the connector. The conductive part 43 can be a metal wire, and a connector matched with the conductive part 43 can be arranged at one end close to the conductive part 43. Each connector is connected with a power port on the control circuit 411. When the other end of each conductive part 43 contacts the same probe head 422, a complete current loop is formed.
[0087] Optionally, Figure 6 is a third probe unit provided by the embodiment of the utility model, which is combined with Figure 2 and Figure 6 It is shown that the probe shaft sleeve 421 includes a sliding block 4210 on the side away from the battery sheet 6 to be detected.
[0088] The probe holder 423 includes a limiting groove 4230, and the probe shaft sleeve 421 is fixed in the limiting groove 4230 through the sliding block 4210.
[0089] The size of the sliding block 4210 can be adapted to the size of the limiting groove 4230, so as to ensure that the sliding block 4210 can be fixed in the limiting groove 4230. By arranging the sliding block 4210 on the probe shaft sleeve 421 away from the battery piece 6 to be measured and arranging the limiting groove 4230 in the probe clamp 423, the probe shaft sleeve 421 can be fixed in the limiting groove 4230 through the sliding block 4210, so that the assembly of the probe shaft sleeve 421 and the probe clamp 423 is realized.
[0090] It can be understood that, through arranging the sliding block 4210 on the probe shaft sleeve 421 away from the battery piece 6 to be measured and arranging the limiting groove 4230 in the probe clamp 423, the probe shaft sleeve 421 and the probe clamp 423 can be flexibly disassembled. When a plurality of probe shaft sleeves 421 are arranged in the same probe clamp 423, a plurality of different sliding blocks 4210 can be arranged in the same limiting groove 4230 at intervals, so that the assembly of the probe shaft sleeve 421 and the sliding block 4210 is more convenient and flexible.
[0091] The technical scheme of the embodiment of the utility model, through setting up support frame, light barrier, laser, probe unit and image acquisition unit in battery piece testing arrangement, through setting up laser incident probe unit sheltered area, utilize light barrier to the range of laser beam to limit, guarantee the battery piece to be measured front all can be scanned by laser and there is no shelter, greatly reduce the result error's occurrence probability due to the shelter of laser to probe wheel, improve the accuracy, increase light barrier to protect those important places in the detection area not to be interfered with other factors and lead to the emergence of the result inaccurate condition.
[0092] The above specific embodiment does not constitute a limitation on the protection scope of the utility model. Those skilled in the art should understand that, according to design requirements and other factors, various modifications, combinations, sub-combinations and substitutions can be made. Any modification, equivalent substitution and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A testing device for a battery cell, characterized by, The test device comprises a support frame, a light barrier, a laser, a probe unit and an image acquisition unit. The light barrier is arranged around the support frame, and the support frame is used for placing a battery piece to be tested. The laser is arranged on the support frame and used for emitting a laser beam to the surface of the battery piece to be tested. The probe unit is used for providing a current for the battery piece to be tested during the test, so that the battery piece to be tested emits light. The projection of the light barrier along the thickness direction of the battery piece to be tested on the plane where the battery piece to be tested is located surrounds the battery piece to be tested.
2. The test device of claim 1, wherein, The projection of the light barrier along the thickness direction of the battery piece to be tested on the plane where the battery piece to be tested is located is a rectangle.
3. The test device of claim 2, wherein, The probe unit comprises a control unit, a probe group and a conductive part.
4. The test device of claim 1, wherein, The probe group is electrically connected with the conductive part. The control unit is fixedly connected with the probe group and is used for controlling the movement of the probe group. The control unit comprises a control circuit, which is electrically connected with the probe group and the conductive part respectively and is used for supplying power to the probe group and the conductive part to form a loop. The probe group comprises a probe shaft sleeve, a probe head and a probe clamp.
5. The test device of claim 4, wherein, The probe shaft sleeve is fixedly connected with the probe clamp, and the probe head is detachably connected to one end of the probe shaft sleeve. The control unit is fixedly connected with the probe clamp, and the control circuit is electrically connected with the probe head. In a first direction, the number of probe clamps is the same as the number of grid lines of the battery piece to be tested.
6. The test device of claim 5, wherein, Each probe clamp is connected with one probe head, and the probe clamps are arranged and connected in the first direction, and the minimum distance between adjacent probe heads is the same as the minimum distance between adjacent grid lines, wherein the first direction is the arrangement direction of the grid lines of the battery piece to be tested. The test device further comprises the probe clamps arranged in a second direction, and the probe clamps are arranged at intervals in the second direction.
7. The test device of claim 6, wherein, In the plane where the battery piece to be tested is located, the first direction and the second direction are perpendicular. Each probe clamp is connected with a plurality of probe heads.
8. The test device of claim 5, wherein, The probe heads are arranged at intervals on the probe clamps, and the interval distance is the same as the minimum distance between adjacent grid lines. The test device further comprises a connector.
9. The test device of claim 4, wherein, The conductive part and the control circuit are electrically connected through the connector. The probe shaft sleeve comprises a sliding block on the side away from the battery piece to be tested.
10. The test device of claim 5, wherein, The probe clamp comprises a limiting groove, and the probe shaft sleeve is fixed in the limiting groove through the sliding block.