Tool jig and device applied to EL detection of battery string

Abstract

The utility model discloses a tool jig and device applied to EL detection of a battery string, and the tool jig comprises a supporting assembly which is fixedly provided with a plurality of conductive blocks in an insulating manner; the downward pressing assembly is movably arranged above the supporting assembly, can be in insulated contact connection with the plurality of conductive blocks and comprises a mounting plate; the connecting mechanism is fixedly arranged on the mounting plate; and the buffer pressing mechanisms are movably arranged on the mounting plate in a penetrating manner, the positions of the buffer pressing mechanisms correspond to the positions of the corresponding conductive blocks, and the buffer pressing mechanisms are pressed to be in tight insulation contact connection with the corresponding conductive blocks. According to the EL detection tool jig, the plurality of pairs of buffer pressing mechanisms are matched with the conductive blocks, so that the problem of poor contact between the conventional EL detection tool jig and the welding strip is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of battery string testing technology, and more specifically, to a tooling fixture and device for EL testing of battery strings. Background Technology

[0002] In the production of solar cell strings, multiple solar cells and solder ribbons need to be welded together. During the production process, due to handling, movement, and microcracks in the solar cells themselves, a solar cell in a string may be damaged. Alternatively, during the welding process, the solder ribbon and solar cell may not be welded firmly, resulting in a cold solder joint. In addition, there may be issues such as dirt and missing corners. When a solar cell in a string is damaged, it needs to be replaced with a qualified solar cell. When a solar cell in a string has a cold solder joint, the affected area needs to be re-welded. Identifying non-compliant solar cells and conducting EL (Elastic Optical) testing after rework are also necessary to determine if the string is defective.

[0003] Existing EL testing fixtures typically place both ends of the battery string on an insulating block (such as bakelite), then press a copper block onto the solder strips of the battery string. The copper block is directly electrically connected to a DC power supply. This connection method allows the direct power supply to power the battery string, and an EL image is obtained by taking a picture of the battery string. Based on the image analysis, the presence of defects such as microcracks, fragments, concentric circles, and black cores is determined. However, since both the copper block and the insulating block are planar surfaces, it's difficult to guarantee consistent contact at every point on both planes. This can lead to incomplete or poor contact between the solder strips and the copper block. Furthermore, the battery string contains multiple solder strips, and the diameter of the solder strips themselves varies. Thicker diameter solder strips may have better contact, while thinner diameter solder strips may have poorer contact. In EL imaging, poorly contacted solder strips appear as if they are incomplete welds, causing visual misjudgment. Therefore, a fixture and device for EL testing of battery strings is provided to solve these problems. Utility Model Content

[0004] One of the objectives of this invention is to provide a tooling fixture and apparatus for EL testing of battery strings, so as to solve the problem of poor contact between existing EL testing tooling fixtures and solder strips.

[0005] The tooling fixture and device for EL testing of battery strings according to this utility model can be achieved through the following technical solutions:

[0006] This utility model discloses a tooling fixture for EL testing of battery strings, comprising a support assembly on which multiple conductive blocks are insulated and fixedly disposed; and a pressing assembly, which is movably disposed above the support assembly and can make insulated contact with the multiple conductive blocks.

[0007] The pressing assembly includes a mounting plate, a connecting mechanism, and multiple buffer pressing mechanisms. The connecting mechanism is fixedly mounted on the mounting plate. The multiple buffer pressing mechanisms are movably disposed through the mounting plate and their positions correspond to the positions of the corresponding conductive blocks. The multiple buffer pressing mechanisms press down and make tight, insulated contact with the corresponding conductive blocks.

[0008] In one embodiment, the buffer pressing mechanism includes a pressure block made of insulating material, which is movably disposed through the mounting plate; an elastic member disposed between the inner wall of the mounting plate and the pressure block, which provides a buffering force to the pressure block; and a locking rod movably disposed through the mounting plate and detachably connected to the pressure block.

[0009] In one embodiment, the mounting plate is provided with a plurality of receiving cavities, and the plurality of buffer pressing mechanisms are respectively movably disposed in the corresponding receiving cavities.

[0010] In one embodiment, the pressure block includes a pressure block body made of insulating material, the pressure block body being movably disposed below the corresponding receiving cavity; it also includes a connector fixedly disposed on the pressure block body and detachably connected to the locking rod.

[0011] In one embodiment, the pressure block body and the connector are integrally formed; the inner wall of the connector is provided with an internal thread, and the lower end of the locking rod is provided with an external thread, and the external thread and the internal thread are detachably threadedly connected.

[0012] In one embodiment, the connecting mechanism includes a connecting body fixedly disposed at the center of the mounting plate; and a fastener detachably disposed on the connecting body.

[0013] In one embodiment, the support assembly further includes a support mechanism and an insulating plate; the insulating plate is fixedly disposed on the support mechanism, and a plurality of conductive blocks are respectively fixedly disposed at intervals on the insulating plate and are insulated from each other.

[0014] In one embodiment, the support mechanism includes two support seats arranged opposite each other; a support plate fixedly disposed between the two support seats; and a plurality of through holes provided through the support seats.

[0015] In one embodiment, the conductive block is made of copper and has multiple stripes on the side opposite to the pressing component, the multiple stripes being wavy.

[0016] This utility model discloses an apparatus for EL testing of battery strings, comprising two tooling fixtures as described above, the two tooling fixtures being arranged opposite to each other, with multiple solder strips at both ends of the battery string respectively placed on corresponding conductive blocks on the two tooling fixtures; multiple first resistors arranged in parallel, with multiple conductive blocks on the first tooling fixture being electrically connected to the positive terminal of a DC power supply through corresponding first resistors; and multiple second resistors arranged in parallel, with multiple conductive blocks on the second tooling fixture being electrically connected to the negative and positive terminals of the DC power supply through corresponding second resistors.

[0017] Compared with the prior art, the advantages of the tooling fixture and device of this utility model for EL detection of battery strings are as follows:

[0018] This utility model discloses a fixture and device for EL testing of battery strings. By employing multiple pairs of split conductive blocks and a buffer pressing mechanism to press multiple solder strips together, the contact between the solder strips and the corresponding conductive blocks is improved, effectively solving the problem of poor contact between existing EL testing fixtures and solder strips. This allows for accurate determination of whether there are defects in the battery string. The use of a buffer pressing mechanism improves compatibility with different solder strip contact height errors. The wavy stripes on the conductive blocks increase the friction between the solder strips and the conductive blocks, thus improving the contact performance between them to a certain extent. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a tooling fixture for EL testing of battery strings according to this utility model, including a support component and a pressing component;

[0021] Figure 2 yes Figure 1 The diagram shows the structural schematic of the supporting components.

[0022] Figure 3 yes Figure 1 The diagram shows the structure of the downward pressing component;

[0023] Figure 4 yes Figure 3 The schematic diagram of the cross-sectional structure of the pressing component shown includes a buffer pressing mechanism;

[0024] Figure 5 yes Figure 4 The diagram shows the structure of the buffer compression mechanism.

[0025] Figure 6 This utility model relates to a device for EL detection of battery strings.

[0026] The diagram indicates: 1, tooling fixture; 10, support assembly; 11, support mechanism; 111, support base; 1111, fixing hole; 112, support plate; 12, insulating plate; 13, conductive block; 131, stripe; 2, first resistor; 20, pressing assembly; 21, mounting plate; 211, receiving cavity; 22, connecting mechanism; 221, connecting body; 222, fixing component; 23, buffer pressing mechanism; 231, pressure block; 2311, pressure block body; 2312, connector; 232, elastic element; 233, locking rod; 3, second resistor; 30, battery string; 31, welding strip; 4, DC power supply. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 As shown, the tooling fixture 1 for EL testing of battery strings according to this utility model mainly includes a support component 10 and a pressing component 20; the support component 10 is fixedly installed at the position to be installed and electrically connected to a DC power supply, and multiple solder strips 31 of the battery string 30 are respectively placed on the support component 10; the pressing component 20 is movably installed above the support component 10 and can be insulatedly connected to the support component 10, so that the multiple solder strips 31 placed on the support component 10 are respectively tightly connected to the support component 10.

[0030] Please see Figure 1 and Figure 2 As shown, in this embodiment, the support assembly 10 includes a support mechanism 11, an insulating plate 12, and multiple conductive blocks 13. The support mechanism 11 serves as the main support body. The insulating plate 12 is fixedly mounted on the support mechanism 11, and the multiple conductive blocks 13 are fixedly mounted on the insulating plate 12 at intervals and insulated from each other. Multiple welding strips 31 are placed on the corresponding conductive blocks 13, and the multiple conductive blocks 13 are electrically connected to a DC power supply. Specifically, the support mechanism 11 includes two support seats 111 and a support plate 112. The two support seats 111 are arranged opposite to each other, and the two ends of the support plate 112 are fixedly mounted on the two support seats 111. In some embodiments, the support plate 112 is made of insulating material, and the multiple conductive blocks 13 are arranged at intervals on the support plate 112. Specifically, the support base 111 has multiple through holes 1111 through it, and screws are used to fix the support base 111 to the required installation position through the through holes 1111; the insulating plate 12 is made of bakelite; the conductive block 13 is made of copper, and multiple stripes 131 are provided on the side of the conductive block 13 opposite to the pressing component 20. Preferably, the multiple stripes 131 are wavy.

[0031] Please see Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the pressing component 20 includes a mounting plate 21, a connecting mechanism 22, and multiple buffer pressing mechanisms 23. The mounting plate 21 serves as the supporting body. The connecting mechanism 22 is fixedly mounted on the mounting plate 21 and is fixedly connected to the lifting component. The lifting component drives the mounting plate 21 to move longitudinally through the connecting mechanism 22. The multiple buffer pressing mechanisms 23 are respectively movably mounted through the mounting plate 21, and their positions correspond to the positions of the corresponding conductive blocks 13. The multiple buffer pressing mechanisms 23 move downward with the mounting plate 21 to make a tight, insulated contact connection between the solder strip 31 placed on the conductive block 13 and the conductive block 13, thereby ensuring good contact between the solder strip 31 and the conductive block 13 and facilitating accurate EL detection operations. Specifically, the mounting plate 21 is provided with multiple receiving cavities 211, and multiple buffer pressing mechanisms 23 are movably disposed in the corresponding receiving cavities 211; the connecting mechanism 22 includes a connecting body 221 and a fixing member 222, the connecting body 221 is fixedly disposed at the center position of the mounting plate 21; the fixing member 222 is detachably disposed on the connecting body 221, and the connecting body 221 is fixedly disposed on the lifting assembly through the fixing member 222.

[0032] Please see Figures 3-5As shown, in this embodiment, the buffer pressing mechanism 23 includes a pressure block 231, an elastic element 232, and a locking rod 233. The pressure block 231 is made of insulating material and is movably disposed in the receiving cavity 211. The elastic element 232 is disposed between the inner wall of the receiving cavity 211 and the pressure block 231, and provides a buffering force to the pressure block 231, thereby changing the rigid contact connection between the pressure block 231 and the welding strip 31 into a flexible contact connection. The locking rod 233 movably passes through the receiving cavity 211 and is detachably connected to the pressure block 231.

[0033] Please see Figure 4 and Figure 5 As shown, in this embodiment, the pressure block 231 includes a pressure block body 2311 and a connector 2312. The pressure block body 2311 is made of insulating material and is movably disposed below the receiving cavity 211. The connector 2312 is fixedly disposed on the pressure block body 2311 and detachably connected to the locking rod 233. Specifically, the pressure block body 2311 and the connector 2312 are integrally formed. The inner wall of the connector 2312 is provided with an internal thread, and the lower end of the locking rod 233 is provided with an external thread. The detachable threaded connection between the connector 2312 and the locking rod 233 is achieved through the cooperation of the external and internal threads. The elastic element 232 is a spring. Preferably, the pressure of the elastic element 232 is 0.2 N / M.

[0034] Please see Figure 6 As shown, the device for EL detection of battery strings according to this utility model includes two tooling fixtures 1, multiple first resistors 2, multiple second resistors 3, and a DC power supply 4. The two tooling fixtures 1 are arranged opposite each other, and multiple solder strips 31 at both ends of the battery string 30 are respectively placed on corresponding conductive blocks 13 on the two tooling fixtures 1. The multiple first resistors 2 are arranged in parallel, and the multiple conductive blocks 13 on the first tooling fixture 1 are electrically connected to the positive terminal of the DC power supply 4 through the corresponding first resistors 2. The multiple second resistors 3 are arranged in parallel, and the multiple conductive blocks 13 on the second tooling fixture 1 are electrically connected to the negative and positive terminals of the DC power supply 4 through the corresponding second resistors 3. The multiple first resistors 2 and multiple second resistors 3 provide current limiting protection for the power supply circuit, thereby effectively preventing overcurrent and sparking. Specifically, the resistance values ​​of the first resistors 2 and the second resistors 3 are both 7 ohms.

[0035] It should be noted that the working process of the tooling fixture and device for EL testing of battery strings of this utility model is as follows: multiple solder strips 31 at both ends of the battery string 30 are placed on the corresponding conductive blocks 13 on two oppositely arranged support components 10. The multiple conductive blocks 13 on the two support components 10 are electrically connected to the DC power supply 4 through the first resistor 2 or the second resistor 3. The two lifting components drive the two pressing components 20 to move downward, so that the multiple buffer pressing mechanisms 23 are in close contact with the corresponding conductive blocks 13, thereby making the conductive blocks 13 and the solder strips 31 in close contact, which facilitates the EL testing operation of the battery string 30.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A tooling fixture for EL detection of battery strings, characterized in that, The utility model relates to a kind of electrically conductive block and the lower pressing assembly of battery string welding strip, including: Supporting assembly, a plurality of electrically conductive blocks are fixedly arranged on the upper insulation of supporting assembly; Lower pressing assembly, which is movably arranged above the supporting assembly and can be insulatedly connected with a plurality of electrically conductive blocks; Wherein, the lower pressing assembly includes a mounting plate, a connecting mechanism and a plurality of buffer lower pressing mechanisms; the connecting mechanism is fixedly arranged on the mounting plate; a plurality of buffer lower pressing mechanisms are movably arranged on the mounting plate and their positions correspond to the positions of the corresponding electrically conductive blocks, respectively; a plurality of buffer lower pressing mechanisms are closely insulatedly connected with the corresponding electrically conductive blocks.

2. The tooling jig for EL inspection of a battery string of claim 1, wherein, The buffer lower pressing mechanism includes a pressing block made of insulating material, which is movably arranged through the mounting plate; a spring is arranged between the inner wall of the mounting plate and the pressing block, which provides a buffer force to the pressing block; a locking rod is movably arranged through the mounting plate and detachably connected with the pressing block.

3. The tooling jig for EL inspection of a battery string of claim 2, wherein, A plurality of accommodating cavities are arranged through the mounting plate, respectively; a plurality of buffer lower pressing mechanisms are movably arranged in the corresponding accommodating cavities, respectively.

4. The tooling jig for EL inspection of a battery string of claim 3, wherein, The pressing block includes a pressing block main body made of insulating material, which is movably arranged below the corresponding accommodating cavity; and a connecting head is fixedly arranged on the pressing block main body and detachably connected with the locking rod.

5. The tooling jig for EL inspection of a battery string of claim 4, wherein, The pressing block main body and the connecting head are integrally formed; an internal thread is arranged on the inner wall of the connecting head; an external thread is arranged on the lower end of the locking rod; the external thread and the internal thread are detachably threadedly connected.

6. The tooling fixture for EL inspection of a battery string of claim 1, wherein, The connecting mechanism includes a connecting main body fixedly arranged at the center of the mounting plate; and a fixing member is detachably arranged on the connecting main body.

7. The tooling fixture for EL inspection of a battery string of claim 1, wherein, The supporting assembly further includes a supporting mechanism and an insulating plate; the insulating plate is fixedly arranged on the supporting mechanism; a plurality of electrically conductive blocks are fixedly arranged on the insulating plate at intervals and insulated from each other, respectively.

8. The tooling jig for EL inspection of a battery string of claim 7, wherein, The supporting mechanism includes two supporting seats arranged oppositely; a supporting plate is fixedly arranged between the two supporting seats; a plurality of through holes are arranged through the supporting seats.

9. The tooling fixture for EL inspection of a battery string of claim 1, wherein, The electrically conductive block is a copper block, which is provided with a plurality of stripes on the side opposite to the lower pressing assembly; the plurality of stripes are in a wavy shape.

10. A device for EL detection of battery strings, characterized in that, Two tooling jigs according to any one of claims 1-9 are arranged oppositely; a plurality of welding strips at both ends of a battery string are placed on the corresponding electrically conductive blocks of the two tooling jigs, respectively; a plurality of first resistors are arranged in parallel; a plurality of electrically conductive blocks on the first tooling jig are electrically connected with the positive electrode of a direct-current power source through the corresponding first resistors, respectively; a plurality of second resistors are arranged in parallel; a plurality of electrically conductive blocks on the second tooling jig are electrically connected with the negative electrode of the direct-current power source through the corresponding second resistors, respectively.

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