Connector and test system

Abstract

The utility model discloses a connector and a test system, and belongs to the technical field of batteries. The connector comprises a base which comprises an arc conductive structure; the shaft rod is located on the inner side of the arc conductive structure, and the central axis of the shaft rod is parallel to the central axis of the arc conductive structure; the shaft rod is rotatably sleeved with the electric conduction barrel, a gap used for containing a welding strip of a battery piece is formed between the electric conduction barrel and the arc electric conduction structure, the center axis of the shaft rod and the center axis of the electric conduction barrel are arranged in a deviated mode, and the electric conduction barrel is used for rotating around the shaft rod so as to adjust the size of the gap. According to the invention, the contact resistance with the battery piece can be reduced, the stability of the contact resistance is improved, and the test stability and accuracy are further improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a connector and a test system. Background Art

[0002] When performing IV tests on photovoltaic modules, the related art uses alligator clips or MC4 connectors to electrically connect the battery cells to the IV tester. However, the contact resistance between the alligator clips and MC4 connectors and the battery cells fluctuates greatly, resulting in poor test stability. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a connector and a test system, which can reduce the contact resistance with the battery cell, improve the stability of the contact resistance, and further improve the test stability and accuracy.

[0004] In a first aspect, this application provides a connector, including:

[0005] A base, including an arc-shaped conductive structure;

[0006] A shaft rod, located inside the arc-shaped conductive structure, and the central axis of the shaft rod is parallel to the central axis of the arc-shaped conductive structure;

[0007] A conductive cylinder, rotatably sleeved on the shaft rod, and there is a gap for accommodating the solder tape of the battery cell between the conductive cylinder and the arc-shaped conductive structure. The central axis of the shaft rod is offset from the central axis of the conductive cylinder, and the conductive cylinder is used to rotate around the shaft rod to adjust the size of the gap.

[0008] According to the connector of this application, by offsetting the central axis of the shaft rod from the central axis of the conductive cylinder, the conductive cylinder rotates around the shaft rod to adjust the size of the gap between the conductive cylinder and the arc-shaped conductive structure. First, rotate the conductive cylinder to increase the gap, put the solder tape of the battery cell into the gap, and then rotate the conductive cylinder to reduce the gap, so that the solder tape of the battery cell has sufficient and good contact with the conductive cylinder and the arc-shaped conductive structure, reducing the contact resistance and improving the stability of the contact resistance, thereby improving the test stability and accuracy.

[0009] According to an embodiment of this application, the radius inside the arc-shaped conductive structure is greater than or equal to the radius of the conductive cylinder.

[0010] According to an embodiment of this application, the offset distance between the central axis of the shaft rod and the central axis of the conductive cylinder is 1 mm to 2 mm.

[0011] According to an embodiment of this application, the arc length of the arc-shaped conductive structure is 1 / 3 to 1 / 2 of the circumference of the circle.

[0012] According to an embodiment of the present application, the outer surface of the conductive tube and / or the inner surface of the arc conductive structure has a rough structure.

[0013] According to one embodiment of the present application, the connector further includes a first adjusting screw;

[0014] The conductive cylinder is a hollow structure, the shaft rod has a first threaded hole located inside the conductive cylinder, the conductive cylinder has an opening corresponding to the first threaded hole, the base has a second threaded hole corresponding to the opening, the first adjusting screw passes through the second threaded hole, the opening and the first threaded hole to be threadedly connected with the base and the shaft rod, and the first adjusting screw is used to adjust the distance between the base and the shaft rod.

[0015] According to one embodiment of the present application, the connector further includes two second adjustment screws;

[0016] The shaft rod has two third threaded holes respectively located on opposite sides of the conductive tube, and the base has two fourth threaded holes respectively arranged corresponding to the two third threaded holes. Two second adjusting screws respectively pass through the two fourth threaded holes and the two third threaded holes to be threadedly connected with the base and the shaft rod, and the second adjusting screw is used to adjust the distance between the base and the shaft rod.

[0017] According to one embodiment of the present application, the connector further includes an operating lever;

[0018] The operating rod is fixedly connected to a side of the conductive tube away from the arc conductive structure.

[0019] According to one embodiment of the present application, the connector further includes a first connecting wire and a second connecting wire;

[0020] The first connecting line is electrically connected to the arc conductive structure, and the second connecting line is electrically connected to the conductive tube.

[0021] In a second aspect, the present application provides a testing system, comprising:

[0022] Tester;

[0023] A connector is electrically connected to the tester, and the connector is the connector as described in the first aspect, and is used to connect the welding strip of the battery cell.

[0024] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0025] By setting the central axis of the shaft rod offset from the central axis of the conductive cylinder, the conductive cylinder is rotated around the shaft rod to adjust the size of the gap between the conductive cylinder and the arc-shaped conductive structure. First, the conductive cylinder is rotated to increase the gap, and the solder tape of the battery cell is placed into the gap. Then, the conductive cylinder is rotated to decrease the gap, so that the solder tape of the battery cell has sufficient and good contact with the conductive cylinder and the arc-shaped conductive structure, reducing the contact resistance and improving the stability of the contact resistance, thereby improving the test stability and accuracy.

[0026] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is one of the schematic structural diagrams of the connector provided by an embodiment of the present application;

[0029] Figure 2 is another schematic structural diagram of the connector provided by an embodiment of the present application;

[0030] Figure 3 is the schematic structural diagram of the conductive cylinder in the connector provided by an embodiment of the present application;

[0031] Figure 4 is the schematic structural diagram of the base in the connector provided by an embodiment of the present application;

[0032] Figure 5 is the third schematic structural diagram of the connector provided by an embodiment of the present application;

[0033] Figure 6 is the fourth schematic structural diagram of the connector provided by an embodiment of the present application;

[0034] Figure 7 is the schematic structural diagram of the test system provided by an embodiment of the present application;

[0035] Figure 8 is the schematic structural diagram of the battery cell provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0037] The connector and test system provided in the embodiments of the present application are described below with reference to the accompanying drawings.

[0038] Figure 1 A schematic diagram of the structure of a connector provided in an embodiment of the present application.

[0039] like Figure 1 As shown, the connector provided in the embodiment of the present application includes a base 1, a shaft 2 and a conductive cylinder 3. The base 1 includes an arc conductive structure 11, and the arc conductive structure 11 can be located at one end of the base 1. The inner side of the arc conductive structure 11 is arc-shaped, and the inner side of the arc conductive structure 11 refers to the side facing the central axis A of the arc conductive structure 11. The material of the arc conductive structure 11 is a conductive material, such as a metal material.

[0040] The shaft 2 is located inside the arc conductive structure 11 , and a central axis B of the shaft 2 is parallel to a central axis A of the arc conductive structure 11 .

[0041] The conductive tube 3 is rotatably sleeved on the shaft 2, that is, the central axis C of the conductive tube 3 is parallel to the central axis B of the shaft 2, and the conductive tube 3 can rotate around the shaft 2. The central axis C of the conductive tube 3 is parallel to the central axis A of the arc conductive structure 11, and there is a gap 4 between the conductive tube 3 and the arc conductive structure 11, and the gap 4 is used to accommodate the welding strip of the battery cell. The central axis B of the shaft 2 is offset from the central axis C of the conductive tube 3, that is, the central axis B of the shaft 2 and the central axis C of the conductive tube 3 are not on a straight line. The conductive tube 3 is used to rotate around the shaft 2 to adjust the size of the gap 4, that is, by rotating the conductive tube 3, the distance between the conductive tube 3 and the arc conductive structure 11 can be adjusted, thereby adjusting the distance between the conductive tube 3 and the arc conductive structure 11 and the welding strip of the battery cell.

[0042] The conductive tube 2 is made of a conductive material, such as a metal material. When there is no gap between the conductive tube 3 and the arc conductive structure 11 and the soldering strip of the battery cell, that is, when the conductive tube 3 and the arc conductive structure 11 are attached to the soldering strip of the battery cell, the conductive tube 3 and the arc conductive structure 11 are electrically connected to the soldering strip of the battery cell.

[0043] Since the central axis B of the shaft 2 is offset from the central axis C of the conductive tube 3, the central axis C of the conductive tube 3 rotates around the shaft 2 during the rotation of the conductive tube 3 around the shaft 2, so that there are two situations in which the conductive tube 3 is close to the arc conductive structure 11 and the conductive tube 3 is far away from the arc conductive structure 11. Figure 1 As shown, the conductive cylinder 3 rotates around the shaft 2, so that the central axis C of the conductive cylinder 3 rotates to the side of the shaft 2 away from the arc conductive structure 11, and the conductive cylinder 3 is away from the arc conductive structure 11. The distance between the conductive cylinder 3 and the arc conductive structure 11 becomes larger, that is, the gap 4 becomes larger, and the soldering strip 40 of the battery cell can be placed in the gap 4. Then, as shown in FIG. Figure 2As shown, the conductive cylinder 3 rotates around the shaft rod 2, causing the central axis C of the conductive cylinder 3 to rotate between the shaft rod 2 and the arc-shaped conductive structure 11. The conductive cylinder 3 approaches the arc-shaped conductive structure 11, and the distance between the conductive cylinder 3 and the arc-shaped conductive structure 11 becomes smaller, that is, the gap 4 becomes smaller. The solder tape 40 of the battery cell is tightly attached between the conductive cylinder 3 and the arc-shaped conductive structure 11, so that the solder tape 40 of the battery cell has sufficient and good contact with the conductive cylinder 3 and the arc-shaped conductive structure 11.

[0044] In the related art, an alligator clip is connected to the solder tape of a battery cell by clamping the solder tape of the battery cell. However, there are differences in the clamping area and position of the alligator clip and the flatness of the solder tape, resulting in a large fluctuation in the contact resistance between the alligator clip and the solder tape of the battery cell. And the MC4 connector is connected to the solder tape of the battery cell through a sleeve structure. However, the wear caused by frequent plugging and unplugging of the sleeve structure and the expansion of the sleeve structure result in a large fluctuation in the contact resistance between the MC4 connector and the solder tape of the battery cell. When performing an IV (current-voltage) test on the battery cell, the large fluctuation in the contact resistance leads to a large fluctuation in the test, affecting the test stability.

[0045] In this embodiment, by rotating the conductive cylinder 3, the solder tape 40 of the battery cell is tightly attached between the conductive cylinder 3 and the arc-shaped conductive structure 11, increasing the contact area between the solder tape 40 of the battery cell and the conductive cylinder 3 and the arc-shaped conductive structure 11, reducing the contact resistance, and the solder tape 40 of the battery cell has sufficient and good contact with the conductive cylinder 3 and the arc-shaped conductive structure 11, improving the stability of the contact resistance. When performing an IV test on the battery cell, the improvement of the stability of the contact resistance can improve the test stability, and the reduction of the contact resistance can improve the test accuracy. In addition, by rotating the conductive cylinder 3, the connection between the connector and the solder tape of the battery cell can be achieved, and the operation is simple and convenient.

[0046] In some embodiments, the radius of the inner side of the arc-shaped conductive structure 11 is greater than or equal to the radius of the conductive cylinder 3. The radius of the inner side of the arc-shaped conductive structure 11 can be equal to the radius of the conductive cylinder 3 or slightly greater than the radius of the conductive cylinder 3, so that when the conductive cylinder 3 is rotated to tightly attach the solder tape 40 of the battery cell between the conductive cylinder 3 and the arc-shaped conductive structure 11, the central axis A of the arc-shaped conductive structure 11 coincides with the central axis C of the conductive cylinder 3, that is, the arc-shaped conductive structure 11 and the conductive cylinder 3 form a concentric circle structure, ensuring that the arc-shaped conductive structure 11 and the conductive cylinder 3 have sufficient and tight contact with the solder tape 40 of the battery cell, and as much as possible increasing the contact area between the arc-shaped conductive structure 11 and the conductive cylinder 3 and the solder tape 40 of the battery cell, reducing the contact resistance.

[0047] In some embodiments, the deviation distance between the central axis B of the shaft rod 2 and the central axis C of the conductive cylinder 3 is 1 mm to 2 mm, that is, the distance between the central axis B of the shaft rod 2 and the central axis C of the conductive cylinder 3 is 1 mm to 2 mm.

[0048] It should be noted that the deviation distance between the central axis B of the shaft rod 2 and the central axis C of the conductive tube 3 cannot be set too small, so as to avoid the gap 4 being too small when the conductive tube 3 is far away from the arc conductive structure 11, resulting in the inability of the soldering ribbon of the battery cell to be inserted into the gap 4 between the conductive tube 3 and the arc conductive structure 11. The deviation distance between the central axis B of the shaft rod 2 and the central axis C of the conductive tube 3 cannot be set too large, so as to avoid the gap 4 being too large when the conductive tube 3 is close to the arc conductive structure 11, resulting in the inability of the soldering ribbon of the battery cell to be closely attached between the conductive tube 3 and the arc conductive structure 11.

[0049] In some embodiments, the arc length of the arc conductive structure 11 is 1 / 3 to 1 / 2 of the circumference. The arc length of the arc conductive structure 11 is the length of the inner side of the arc conductive structure 11 along the circumference, and the circumference is the length of the inner side of the arc conductive structure 11 along the circumference.

[0050] In this embodiment, the arc length of the arc conductive structure 11 is set to 1 / 3 to 1 / 2 of the circumference. When the conductive cylinder 3 is rotated to reduce the gap 4 to ensure that the arc conductive structure 11 and the conductive cylinder 3 have a sufficiently tight contact with the welding strip 40 of the battery cell, the contact area between the arc conductive structure 11 and the conductive cylinder 3 and the welding strip 40 of the battery cell can be increased as much as possible to reduce the contact resistance.

[0051] In some embodiments, the outer surface of the conductive tube 3 and / or the inner surface of the arc conductive structure 11 has a rough structure, that is, the outer surface of the conductive tube 3 has a rough structure, or the inner surface of the arc conductive structure 11 has a rough structure, or the outer surface of the conductive tube 3 and the inner surface of the arc conductive structure 11 have a rough structure.

[0052] like Figure 3 As shown, the outer surface of the conductive tube 3 may have a rough structure (first rough structure 51), and the first rough structure 51 may be a convex structure, a concave structure, or a partially convex structure and a partially concave structure. The material of the first rough structure 51 is a conductive material, such as a metal material. The first rough structure 51 and the conductive tube 3 may be an integrally formed structure.

[0053] like Figure 4 As shown, the surface inside the arc conductive structure 11 may have a rough structure (second rough structure 52), and the second rough structure 52 may be a convex structure, a concave structure, or a partially convex structure and a partially concave structure. The material of the second rough structure 52 is a conductive material, such as a metal material. The second rough structure 52 and the arc conductive structure 11 may be an integrally formed structure.

[0054] When the outer surface of the conductive cylinder 3 has a first rough structure 51 and the inner surface of the arc-shaped conductive structure 11 has a second rough structure 52, the first rough structure 51 and the second rough structure 52 can be adapted to each other. For example, the first rough structure 51 is a convex structure and the second rough structure 52 is a concave structure; or, the first rough structure 51 is a concave structure and the second rough structure 52 is a convex structure; or, the first rough structure 51 includes a first convex structure and a first concave structure (that is, part of the first rough structure 51 is a convex structure and part is a concave structure), and the second rough structure 52 includes a second convex structure and a second concave structure (that is, part of the second rough structure 52 is a convex structure and part is a concave structure), and the second convex structure is arranged corresponding to the first concave structure, and the second concave structure is arranged corresponding to the first convex structure.

[0055] In this embodiment, the outer surface of the conductive cylinder 3 and / or the inner surface of the arc-shaped conductive structure 11 has a rough structure, which can further increase the contact area between the solder tape of the battery cell and the conductive cylinder 3 and the arc-shaped conductive structure 11 when the solder tape of the battery cell is in close contact with the conductive cylinder 3 and the arc-shaped conductive structure 11, thereby further reducing the contact resistance.

[0056] In some embodiments, as Figure 1 shown, the base 1 may further include a flat plate structure 12, and one end of the flat plate structure 12 is connected to one end of the arc-shaped conductive structure 12. The inner side of the arc-shaped conductive structure 12 may be located above the flat plate structure 12. Among them, the flat plate structure 12 may be a conductive structure or a non-conductive structure. In some embodiments, the arc-shaped conductive structure 11 and the flat plate structure 12 may be an integrally formed structure.

[0057] In some embodiments, as Figure 5 shown, the connector further includes a first adjusting screw 71. The conductive cylinder 3 is a hollow structure, the shaft rod 2 has a first threaded hole 81 located inside the conductive cylinder 3, the conductive cylinder 3 has an opening 82 corresponding to the first threaded hole 81, the base 1 has a second threaded hole 83 corresponding to the opening 82, and the first adjusting screw 71 passes through the second threaded hole 83, the opening 82 and the first threaded hole 81 to be threadedly connected to the base 1 and the shaft rod 2. The first adjusting screw 71 is used to adjust the distance between the base 1 and the shaft rod 2.

[0058] Among them, the conductive cylinder 3 has a hollow structure, that is, the conductive cylinder 3 has a cavity, and the shaft rod 2 passes through the cavity. The first threaded hole 81 is located in the cavity and can longitudinally penetrate through the shaft rod 2, and the longitudinal direction is perpendicular to the central axis B of the shaft rod 2. The opening 82 on the conductive cylinder 3 is communicated with the cavity, and the opening 82 can be located at the bottom of the first threaded hole 81, so that the opening 82 and the first threaded hole 81 are correspondingly arranged. The second threaded hole 83 on the base 1 longitudinally penetrates through the base 1, and the second threaded hole 83 can be located at the bottom of the opening 82, and the second threaded hole 83, the opening 82 and the first threaded hole 81 can be located on a straight line, so that the second threaded hole 83, the opening 82 and the first threaded hole 81 are correspondingly arranged.

[0059] The thread on the first adjusting screw 71 is adapted to the threads on the first threaded hole 81 and the second threaded hole 82, so that the first adjusting screw 71 passes through the second threaded hole 83 and is threadedly connected to the base 1, and passes through the first threaded hole 81 and is threadedly connected to the shaft rod 2. In some embodiments, the connector may further include a first nut 72, and the first nut 72 can be located at the bottom of the base 1 to be threadedly connected to one end of the first adjusting screw 71.

[0060] By rotating the first adjusting screw 71, the distance between the base 1 and the shaft rod 2 can be adjusted, and further the distance between the arc-shaped conductive structure 11 and the conductive cylinder 3 can be adjusted (that is, the size of the gap 4 is adjusted). Among them, the first adjusting screw 71 and the conductive cylinder 3 can be used in cooperation. When testing the battery cell, the conductive cylinder 3 can be rotated first to increase the gap 4, and then the first adjusting screw 71 can be rotated to further increase the gap 4, which is convenient for putting the welding tape of the battery cell into the gap 4. Then, rotate the first adjusting screw 71 in the reverse direction to roughly reduce the gap 4, and then rotate the conductive cylinder 3 to further reduce the gap 4, so that the welding tape of the battery cell is closely attached to the conductive cylinder 3 and the arc-shaped conductive structure 11.

[0061] In this embodiment, by adjusting the distance between the base 1 and the shaft rod 2 through the first adjusting screw 71, the distance between the arc-shaped conductive structure 11 and the conductive cylinder 3 can be adjusted, which can be compatible with different specifications and types of welding tapes, so that different specifications and types of welding tapes can be placed between the arc-shaped conductive structure 11 and the conductive cylinder 3.

[0062] In some embodiments, the second threaded hole 83 can be located on the flat plate structure 12 of the bottom plate 1, that is, the first adjusting screw 71 does not pass through the gap 4, so as to avoid the setting of the first adjusting screw 71 affecting the placement of the welding tape of the battery cell into the gap 4.

[0063] In some embodiments, such as Figure 6As shown, the connector further includes two second adjusting screws 73. The shaft rod 2 has two third threaded holes 84 located on opposite sides of the conductive cylinder 3 respectively, and the base 1 has two fourth threaded holes 85 correspondingly arranged with the two third threaded holes 84 respectively. The two second adjusting screws 73 respectively pass through the two fourth threaded holes 85 and the two third threaded holes 84 to be threadedly connected to the base 1 and the shaft rod 2. The second adjusting screw 73 is used to adjust the distance between the base 1 and the shaft rod 2.

[0064] Among them, the conductive cylinder 3 can be a hollow structure or a solid structure. The shaft rod 2 extends axially through the conductive cylinder 3 and protrudes from opposite sides of the conductive cylinder 3 along the axis. The two third threaded holes 84 of the shaft rod 2 are located on opposite sides of the conductive cylinder 3 along the axis, and both of the two third threaded holes 84 can penetrate the shaft rod 2 longitudinally. The two fourth threaded holes 85 on the base 1 are respectively located at the bottoms of the two third threaded holes 84 so that the two fourth threaded holes 85 are arranged in one-to-one correspondence with the two third threaded holes 84.

[0065] The threads on the second adjusting screw 73 are adapted to the threads on the third threaded hole 84 and the fourth threaded hole 85, so that one second adjusting screw 73 passes through one fourth threaded hole 85 to be threadedly connected to the base 1 and passes through the corresponding third threaded hole 84 to be threadedly connected to the shaft rod 2. The other second adjusting screw 73 passes through the other fourth threaded hole 85 to be threadedly connected to the base 1 and passes through the corresponding third threaded hole 84 to be threadedly connected to the shaft rod 2. In some embodiments, the connector may further include two second nuts 74. The two second nuts 74 can be located at the bottom of the base 1 and are respectively threadedly connected to one end of the two second adjusting screws 73 correspondingly.

[0066] By rotating the two second adjusting screws 73, the distance between the base 1 and the shaft rod 2 can be adjusted, and further the distance between the arc-shaped conductive structure 11 and the shaft rod 2 can be adjusted (i.e., the size of the gap 4 is adjusted). Among them, the second adjusting screw 73 and the conductive cylinder 3 can be used in cooperation. When testing the battery cell, the conductive cylinder 3 can be rotated first to increase the gap 4, and then the two second adjusting screws 73 are rotated to further increase the gap 4 to facilitate putting the welding tape of the battery cell into the gap 4. Then, the two second adjusting screws 73 are rotated in the reverse direction to roughly reduce the gap 4, and then the conductive cylinder 3 is rotated to further reduce the gap 4 so that the welding tape of the battery cell is closely attached to the conductive cylinder 3 and the arc-shaped conductive structure 11.

[0067] In this embodiment, the distance between the base 1 and the shaft rod 2 is adjusted by two second adjusting screws 73, so as to adjust the distance between the arc-shaped conductive structure 11 and the conductive cylinder 3, which can be compatible with different specifications and types of solder tapes, so that solder tapes of different specifications and types can be placed between the arc-shaped conductive structure 11 and the conductive cylinder 3. Moreover, the two second adjusting screws 73 are located on opposite sides of the conductive cylinder 3, which is more suitable for placing the solder tape of the battery cell between the conductive cylinder 3 and the arc-shaped conductive structure 11.

[0068] In some embodiments, the two second adjusting screws 73 can be located on the flat plate structure 12 of the base plate 1, that is, the two second adjusting screws 73 do not pass through the gap 4, so as to avoid the setting of the two second adjusting screws 73 affecting the placement of the solder tape of the battery cell into the gap 4.

[0069] In some embodiments, the connector further includes an operating rod 31, and the operating rod 31 is fixedly connected to the side of the conductive cylinder 3 facing away from the arc-shaped conductive structure 11. Among them, the operating rod 31 can be a conductive structure or a non-conductive structure. In some embodiments, the operating rod 31 and the conductive cylinder 3 can be an integrally formed structure.

[0070] This embodiment is provided with the operating rod 31, which facilitates operating the conductive cylinder 3 through the operating rod 31 to make the conductive cylinder 3 rotate around the shaft rod 2.

[0071] In some embodiments, as Figure 1 shown, the connector further includes a first connecting wire 91 and a second connecting wire 92. The first connecting wire 91 is electrically connected to the arc-shaped conductive structure 11, and the second connecting wire 92 is electrically connected to the conductive cylinder 3. Among them, the first connecting wire 91 can be directly connected to the arc-shaped conductive structure 11, and the solder tape of the battery cell is electrically connected to the first connecting wire 91 through the arc-shaped conductive structure 11. The second connecting wire 92 can be directly connected to the conductive cylinder 3, and the solder tape of the battery cell is electrically connected to the second connecting wire 92 through the conductive cylinder 3.

[0072] When the flat plate structure 12 in the base 1 is a conductive structure, the first connecting wire 91 can also be connected to the flat plate structure 12, and the solder tape of the battery cell is electrically connected to the first connecting wire 91 through the arc-shaped conductive structure 11 and the flat plate structure 12. When the operating rod 31 is a conductive structure, the second connecting wire 92 can also be connected to the operating rod 31, and the solder tape of the battery cell is electrically connected to the second connecting wire 92 through the operating rod 31 and the conductive cylinder 3.

[0073] When performing an IV test on the battery cell, the first connecting wire 91 and the second connecting wire 92 are used to be electrically connected to the tester, so that the solder tape of the battery cell is electrically connected to the tester through the connector, so that the tester can perform an IV test on the battery cell. Among them, one of the first connecting wire 91 and the second connecting wire 92 is a voltage test connecting wire, and the other connecting wire is a current test connecting wire.

[0074] According to the connector provided by the embodiment of the present application, by deviating the central axis B of the shaft rod 2 from the central axis C of the conductive cylinder 3, the conductive cylinder 3 rotates around the shaft rod 2 to adjust the size of the gap 4 between the conductive cylinder 3 and the arc-shaped conductive structure 11. First, the conductive cylinder 3 is rotated to increase the gap 4, and the welding tape of the battery cell is placed into the gap. Then, the conductive cylinder 3 is rotated to reduce the gap 4, so that the welding tape of the battery cell has sufficient and good contact with the conductive cylinder 3 and the arc-shaped conductive structure 11, reducing the contact resistance and improving the stability of the contact resistance, thereby improving the test stability and accuracy.

[0075] Correspondingly, the embodiment of the present application further provides a test system.

[0076] As Figure 7 shown, the test system provided by the embodiment of the present application includes a tester 10 and a connector 20. The connector 20 is the connector in the above embodiment, and details are not described herein again. The connector 20 is electrically connected to the tester 10. For example, the first connection wire 91 and the second connection wire 92 in the connector 20 are respectively electrically connected to the tester 10. The connector 20 is used to connect the welding tape 40 of the battery cell, and the tester 10 is used to perform IV test on the battery cell.

[0077] As Figure 8 shown, the battery cell 30 has a front electrode and a back electrode. There are two welding tapes 40 on the battery cell 30. One welding tape 40 is connected to the front electrode of the battery cell 30, and the other welding tape 40 is connected to the back electrode of the battery cell 30. Among them, one of the front electrode and the back electrode of the battery cell 30 is the positive electrode, and the other is the negative electrode, so that one of the two welding tapes 40 is the positive electrode welding tape and the other is the negative electrode welding tape. For example, the front electrode of the battery cell 30 is the negative electrode, and the back electrode of the battery cell 30 is the positive electrode. The positive electrode welding tape is connected to the positive electrode of the battery cell 30, and the negative electrode welding tape is connected to the negative electrode of the battery cell 30.

[0078] The test system may include two connectors 20, and the two connectors 20 are respectively the connectors in the above embodiment. The first connection wires 91 and the second connection wires 92 of the two connectors 20 are respectively electrically connected to the tester 10. When performing the IV test on the battery cell 30, the two connectors 20 are respectively connected to the two welding tapes 40 of the battery cell 30, that is, the positive electrode welding tape of the battery cell 30 is connected to one connector 20, and the negative electrode welding tape of the battery cell 30 is connected to the other connector 20, so that the positive electrode welding tape and the negative electrode welding tape of the battery cell 30 are respectively connected to the tester 10 through the two connectors 20, so that the positive electrode and the negative electrode of the battery cell 30 are respectively connected to the tester 10.

[0079] Combined with Figure 1As shown, the conductive cylinders 3 in the two connectors 20 rotate around the shaft rod 2 respectively, increasing the gap 4 between the conductive cylinder 3 and the arc-shaped conductive structure 11. The two solder tapes 40 (i.e., the positive solder tape and the negative solder tape) of the battery cell 30 are respectively placed into the gap 4 of the two connectors 20. Then, in combination with Figure 2 As shown, the conductive cylinders 3 in the two connectors 20 rotate around the shaft rod 2 respectively, decreasing the gap 4 between the conductive cylinder 3 and the arc-shaped conductive structure 11. The two solder tapes 40 (i.e., the positive solder tape and the negative solder tape) of the battery cell 30 are respectively closely attached between the conductive cylinder 3 and the arc-shaped conductive structure 11 of the two connectors 20, so that the two solder tapes 40 (i.e., the positive solder tape and the negative solder tape) of the battery cell 30 respectively have sufficient and good contact with the conductive cylinder 3 and the arc-shaped conductive structure 11 of the two connectors 20, so as to enable the tester 10 to perform an IV test on the battery cell 30.

[0080] Since the photovoltaic module works outdoors for a long time, it is necessary to perform an aging test on the photovoltaic module. And the aging test mainly uses the IV parameters of the battery cell before and after the aging test as the judgment standard. Therefore, by performing an IV test on the battery cell 30 through the tester 10 to obtain stable and accurate IV parameters, the accuracy of the aging test can be improved.

[0081] According to the test system provided by the embodiment of the present application, by deviating the central axis B of the shaft rod 2 in the connector 10 from the central axis C of the conductive cylinder 3, the conductive cylinder 3 rotates around the shaft rod 2 to adjust the size of the gap 4 between the conductive cylinder 3 and the arc-shaped conductive structure 11. First, by rotating the conductive cylinder 3 to increase the gap 4, the solder tape of the battery cell 30 is placed into the gap. Then, by rotating the conductive cylinder 3 to decrease the gap 4, the solder tape of the battery cell 30 has sufficient and good contact with the conductive cylinder 3 and the arc-shaped conductive structure 11, reducing the test contact resistance and improving the stability of the test contact resistance. When performing an IV test on the battery cell, the improvement of the stability of the contact resistance can improve the test stability, and the reduction of the contact resistance can improve the test accuracy. In addition, by rotating the conductive cylinder 3, the connection between the connector 20 and the solder tape 40 of the battery cell 30 can be realized, and the operation is simple and convenient.

[0082] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or multiple.

[0083] In the description of the present application, "a plurality of" means two or more.

[0084] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A connector, characterized in that: include: A base, including an arc conductive structure; A shaft rod is located inside the arc conductive structure, and a central axis of the shaft rod is parallel to a central axis of the arc conductive structure; A conductive cylinder is rotatably sleeved on the shaft, a gap is provided between the conductive cylinder and the arc conductive structure for accommodating the welding strip of the battery cell, the central axis of the shaft is offset from the central axis of the conductive cylinder, and the conductive cylinder is used to rotate around the shaft to adjust the size of the gap.

2. The connector according to claim 1, characterized in that: The inner radius of the arc conductive structure is greater than or equal to the radius of the conductive tube.

3. The connector according to claim 1, characterized in that: The deviation distance between the central axis of the shaft and the central axis of the conductive tube is 1 mm to 2 mm.

4. The connector according to claim 1, characterized in that: The arc length of the circular arc conductive structure is 1 / 3 to 1 / 2 of the circumference.

5. The connector according to claim 1, characterized in that: The outer surface of the conductive tube and / or the inner surface of the arc conductive structure have a rough structure.

6. The connector according to claim 1, characterized in that: The connector also includes a first adjustment screw; The conductive cylinder is a hollow structure, the shaft rod has a first threaded hole located inside the conductive cylinder, the conductive cylinder has an opening corresponding to the first threaded hole, the base has a second threaded hole corresponding to the opening, the first adjusting screw passes through the second threaded hole, the opening and the first threaded hole to be threadedly connected with the base and the shaft rod, and the first adjusting screw is used to adjust the distance between the base and the shaft rod.

7. The connector according to claim 1, characterized in that: The connector also includes two second adjustment screws; The shaft rod has two third threaded holes respectively located on opposite sides of the conductive tube, and the base has two fourth threaded holes respectively arranged corresponding to the two third threaded holes. Two second adjusting screws respectively pass through the two fourth threaded holes and the two third threaded holes to be threadedly connected with the base and the shaft rod, and the second adjusting screw is used to adjust the distance between the base and the shaft rod.

8. The connector according to claim 1, characterized in that: The connector also includes an operating lever; The operating rod is fixedly connected to a side of the conductive tube away from the arc conductive structure.

9. The connector according to any one of claims 1 to 8, characterized in that: The connector further includes a first connecting wire and a second connecting wire; The first connecting line is electrically connected to the arc conductive structure, and the second connecting line is electrically connected to the conductive tube.

10. A testing system, characterized in that: include: Tester; A connector, electrically connected to the tester, wherein the connector is a connector as described in any one of claims 1 to 9, and is used to connect the welding strip of the battery cell.

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