Connecting device and detection equipment

Abstract

The invention discloses a connecting device and detection equipment, and belongs to the technical field of batteries, the connecting device is used for connecting a battery pole and an equipment current line terminal, and the connecting device comprises a lap joint piece connected to the battery pole; the first connecting piece is connected to one side of the lap joint piece; the second connecting piece is connected to the side, away from the first connecting piece, of the lap joint piece; the second connecting piece is provided with a first position and a second position, and at the first position, the second connecting piece and the first connecting piece are arranged at intervals in the length direction. The stacking arrangement of the first connecting piece and the second connecting piece increases the over-current area of current on the connecting device, improves the over-current capability, and reduces the heat production of the connecting device. In the battery short-circuit test process, the temperature of the connecting device is low, so that fusing and burning of the connecting device can be avoided to a certain extent, and it is ensured that the test can be completed smoothly.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to connection devices and detection equipment. Background Art

[0002] During the battery development phase, short-circuit testing is required to ensure safety and reliability. During testing, one end of a tab is typically welded to the positive or negative electrode of the battery, while the other end is connected to the device's current line terminal. However, prolonged short-circuit testing can cause the tab to heat up, making it susceptible to melting or burning. Summary of the Invention

[0003] Purpose of the invention: An embodiment of the present application provides a connection device, which aims to overcome the technical problem that when a battery is short-circuited through a bar, the bar may cause the bar to melt or burn; another purpose of the embodiment of the present application is to provide a detection device.

[0004] Technical solution: A connection device according to an embodiment of the present application is used to connect a battery pole and a device current line terminal, and the connection device includes:

[0005] A connecting piece connected to the battery pole;

[0006] a first connecting member connected to one side of the connecting member;

[0007] a second connecting member connected to a side of the bridging member facing away from the first connecting member;

[0008] The second connecting member has a first position and a second position. In the first position, the second connecting member is spaced apart from the first connecting member along the length direction; in the second position, the second connecting member is located on one side of the first connecting member along the thickness direction, and the two are connected so that both the first connecting member and the second connecting member are connected to the device current line terminal.

[0009] In some embodiments, the connecting device satisfies: 8.24 cm 2 ≤S1+S2≤11.74cm 2 ;

[0010] Wherein, S1 is the orthographic projection area of the first connecting member on a plane perpendicular to the longitudinal direction, and S2 is the orthographic projection area of the second connecting member on a plane perpendicular to the longitudinal direction.

[0011] In some embodiments, the first connecting member has a first through hole, the second connecting member has a second through hole, and in the second position, the first through hole is connected to the second through hole; the connecting device includes:

[0012] A fixing member, in the second position, is passed through the first through hole and the second through hole, and the fixing member connects the device current line terminal with the first connecting member and the second connecting member.

[0013] In some embodiments, the bridging member comprises:

[0014] a main body connected to one side of the first connector along the length direction, the main body being connected to the battery post;

[0015] The bending portion is connected between the main body and the second connecting member to enable the second connecting member to flip from the first position to the second position.

[0016] In some embodiments, the body portion comprises:

[0017] a substrate connected between the first connecting member and the bending portion;

[0018] The welding structure is provided on the substrate and is used for welding the main body and the battery pole.

[0019] In some embodiments, the substrate has a positioning hole, which is arranged to penetrate along the thickness direction, and the positioning hole is used to correspond to the matching structure on the battery pole.

[0020] In some embodiments, the substrate has a plurality of positioning holes, and the plurality of positioning holes are arranged at intervals around the welding structure, and each of the positioning holes is arranged corresponding to one of the matching structures on the battery pole.

[0021] In some embodiments, the bending portion includes a plurality of thinning sheets. At the first position, the plurality of thinning sheets are spaced apart along the thickness direction, and each of the thinning sheets is connected between the main body and the second connecting member.

[0022] In some embodiments, the thinning sheet, the main body, and the second connecting member are an integrated structure.

[0023] A detection device comprises any one of the connecting devices described above.

[0024] Beneficial effect: The connecting device of the embodiment of the present application is used to connect the battery pole and the device current line terminal, and the connecting device includes: a lap joint connected to the battery pole; a first connector connected to one side of the lap joint; a second connector connected to the side of the lap joint away from the first connector; the second connector has a first position and a second position, and in the first position, the second connector and the first connector are spaced apart along the length direction; in the second position, the second connector is located on one side of the first connector along the thickness direction, and the two are connected so that the first connector and the second connector are both connected to the device current line terminal. The stacking arrangement of the first connector and the second connector increases the flow area of the current on the connecting device, improves the flow capacity, and reduces the heat generation of the connecting device. During the battery short circuit test, the temperature on the connecting device is relatively low, so to a certain extent, the melting and burning of the connecting device can be avoided, ensuring that the test can be completed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a front view of the connecting device according to an embodiment of the present application, wherein the second connecting member is located in the first position;

[0027] Figure 2 This is a left-side structural schematic diagram of the connecting device according to an embodiment of the present application, wherein the second connecting member is located in the first position;

[0028] Figure 3 For the embodiment of this application Figure 2 A partial enlarged view of area A in the middle;

[0029] Figure 4 This is a schematic structural diagram of the connecting device according to an embodiment of the present application, wherein the second connecting member is located at the second position;

[0030] Figure 5 This is a schematic structural diagram of a connecting device according to an embodiment of the present application, wherein the fixing member passes through the first connecting member and the second connecting member;

[0031] Figure 6 This is a schematic structural diagram of a battery terminal according to an embodiment of the present application;

[0032] Figure 7 This is a structural diagram of the connection device of an embodiment of the present application when connected to a battery terminal, wherein the second connecting member is located in the first position;

[0033] Figure markings: 10-connector; 11-main body; 111-substrate; 1111-positioning hole; 112-welding structure; 12-bending portion; 121-thinning sheet; 20-first connecting member; 21-first through hole; 30-second connecting member; 31-second through hole; 40-fixing member; 50-battery pole; 51-matching structure; 60-equipment current line terminal; X-length direction; Y-thickness direction. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, and at least one means one, two, or more, unless otherwise clearly and specifically defined.

[0036] Lithium-ion batteries are a green and clean new energy battery with excellent properties such as a high discharge platform, high energy density, long service life and no memory effect. Therefore, they are widely used in electric vehicles, energy storage and other industries. Currently, power batteries and energy storage batteries are more popular in the market. As market demand increases, the demand for battery capacity often increases accordingly. During the battery development stage, the battery needs to be verified and tested according to the corresponding industry standards and corresponding requirements. Among them, short-circuit testing is an important part of ensuring the safety and reliability of battery products. The test of single cells generally requires welding the battery plates to the positive and negative poles before testing. Therefore, when conducting a short-circuit test, the current capacity of the battery plate is a great test.

[0037] Current battery tab welding typically uses a universal tab, similar to the tabs used in other performance and safety tests. These tabs typically consist of three parts: one end is welded to the battery terminal, the other end connects to the device's current line terminal, and a flexible connector is located in the middle. Prolonged short-circuit testing of batteries can cause the tab to heat up, making it susceptible to melting or burning, leading to test failure and increasing testing costs.

[0038] In view of this, an embodiment of the present application provides a connection device to overcome at least one of the above-mentioned technical problems.

[0039] See also Figure 1 and Figure 5 In the embodiment of the present application, the connecting device is used to connect the battery pole 50 and the device current line terminal 60. The connecting device includes a bridge 10, a first connecting member 20 and a second connecting member 30.

[0040] The bridging member 10 is connected to the battery terminal 50. The first connector 20 is connected to one side of the bridging member 10. The second connector 30 is connected to the side of the bridging member 10 facing away from the first connector 20. The second connector 30 has a first position and a second position. In the first position, the second connector 30 is spaced apart from the first connector 20 along the length direction X. In the second position, the second connector 30 is located on one side of the first connector 20 along the thickness direction Y, and the two are connected, so that both the first connector 20 and the second connector 30 are connected to the device current line terminal 60. The length direction X is the length of the first connector 20, and the thickness direction Y is the thickness of the first connector 20.

[0041] It is understandable that when a short circuit test is performed on a battery, the battery pole 50 and the device current line terminal 60 can be connected separately through a connecting device to establish a direct circuit path so that current can flow through the battery and the test equipment. The connecting device can be made of a metal material with good conductivity, such as aluminum or copper. The electrical connection between the connecting member 10 and the battery pole 50 is achieved by welding the connecting member 10 on the connecting device and the battery pole 50 or other conventional connection methods. The original second connecting member 30 is in the first position, that is, the second connecting member 30 and the first connecting member 20 are spaced apart along the length direction X. When the connecting device is connected to the device current line terminal 60, since the second connecting member 30 is rotatably connected to the connecting member 10, the second connecting member 30 can be rotated and flipped over so that the second connecting member 30 rotates from the first position to the second position. In the second position, the second connector 30 is connected to one side of the first connector 20 along the thickness direction Y. That is, the second connector 30 and the first connector 20 are stacked in the thickness direction Y, and both the first connector 20 and the second connector 30 are connected to the device current line terminal 60. By flipping the second connector 30 so that the second connector 30 and the first connector 20 are stacked, the current on the battery post 50 can be simultaneously conducted to the device current line terminal 60 through the first connector 20 and the second connector 30. Alternatively, the current on the device current line terminal 60 can be simultaneously conducted to the battery post 50 through the first connector 20 and the second connector 30. The stacked arrangement of the first connector 20 and the second connector 30 increases the current flow area of the connection device, improves the current flow capacity, and reduces the heat generation of the connection device. When performing a short-circuit test on the battery, the connecting device generates less heat than the original bar structure in the same period of time. During the test, the temperature on the connecting device is lower, so to a certain extent, it can avoid the connecting device from melting or burning, ensuring that the test can be completed smoothly. Multiple tests will not be performed due to the melting of the connecting device, reducing the number of tests and thus reducing the testing cost.

[0042] See also Figure 1 and Figure 5 In combination with the above embodiments, in some embodiments, the connection device satisfies: 8.24cm 2 ≤S1+S2≤11.74cm 2 Wherein, S1 is the orthographic projection area of the first connecting member 20 on the plane perpendicular to the longitudinal direction X, and S2 is the orthographic projection area of the second connecting member 30 on the plane perpendicular to the longitudinal direction X. The sum of S1 and S2 is 8.24 cm 2 and 11.74cm 2 When within the range (including 8.24cm 2 and 11.74cm 2), the sum of S1 and S2 can be 8.24cm 2 , 8.5cm 2 , 9cm 2 , 9.5cm 2 , 10cm 2 , 10.5cm 2 , 11cm 2 , 11.5cm 2 、11.74cm 2 Any numerical value or a range value between any two numerical values in . Since the first connector 20 and the second connector 30 are rectangular structures, S1 and S2 can be measured by a caliper: the corresponding dimensions of a side surface of the first connector 20 and the second connector 30 in the length direction X can be directly measured using a caliper, and then the area of the corresponding side surface (i.e., the orthographic projection area of the first connector 20 and the second connector 30 on the plane perpendicular to the length direction X) can be obtained by calculation, which is the value of S1 and S2. It can also be measured by a three-dimensional scanner, which can obtain three-dimensional data corresponding to the first connector 20 and the second connector 30, and then the corresponding area of a side surface of the first connector 20 and the second connector 30 in the length direction X can be obtained by calculation, which is the value of S1 and S2.

[0043] According to current industry testing standards, the maximum short-circuit resistance of the energy storage battery is set to 1mΩ, and the short-circuit duration is maintained for 10 minutes. If it is a lithium iron battery, the current during the 10-minute short-circuit period is as high as about 3000A, and the temperature of the corresponding pole is as high as about 400℃-500℃. Multiple connecting devices of different sizes are connected to the poles of multiple lithium iron batteries (the orthographic projection area S1 of the first connecting member 20 on each connecting device on the plane perpendicular to the length direction X is different, and the orthographic projection area S2 of the second connecting member 30 on the plane perpendicular to the length direction X is also different) to form multiple test samples. Short-circuit tests are performed on these multiple test samples. A current of about 3000A is applied to the connecting device, and the short circuit is maintained for 10 minutes. The connecting device is observed to see if it is blown. The test results are as follows:

[0044]

[0045]

[0046] Combined with the above table, we can see that when 8.24cm 2 ≤S1+S2≤11.74cm 2During the short-circuit test, the connection device did not fuse, indicating that the first connector 20 and the second connector 30 on the connection device are of appropriate size and have good current capacity. The temperature on the connection device did not reach the melting point of the first connector 20 and the second connector 30, maintaining integrity and meeting the requirements of the battery short-circuit test. 2 When the connection device is blown, it means that the size of the first connector 20 and the second connector 30 on the connection device is not appropriate and the current capacity is low, which makes the temperature on the first connector 20 and the second connector 30 too high, reaching the melting point of the first connector 20 and the second connector 30. At least one of the two has blown, and the battery short circuit test requirements cannot be met. When S1+S2>11.74cm 2 When the connection device is used, the connection device does not melt, but the size of the connection device is relatively large, that is, the size of the first connection member 20 and the second connection member 30 is relatively large, which is not conducive to the spatial layout inside the battery pack or battery module and is not recommended.

[0047] See also Figure 1 and Figure 5 In combination with the above embodiments, in some embodiments, the first connector 20 has a first through hole 21, the second connector 30 has a second through hole 31, and in the second position, the first through hole 21 communicates with the second through hole 31. The connecting device includes a fixing member 40. In the second position, the fixing member 40 is disposed through the first through hole 21 and the second through hole 31, and the fixing member 40 connects the device current line terminal 60 to the first connector 20 and the second connector 30.

[0048] It is understood that after the second connector 30 is flipped, the second connector 30 moves from the first position to the second position. At this time, the first connector 20 and the second connector 30 are stacked, and the first through hole 21 on the first connector 20 and the second through hole 31 on the second connector 30 are positioned correspondingly and interconnected. The first connector 20 and the second connector 30 can then be connected by a fixing member 40 that penetrates the first through hole 21 and the second through hole 31, thereby preventing the second connector 30 from resetting after flipping and allowing the first connector 20 and the second connector 30 to be tightly connected together. The fixing member 40 can be a fixed connection structure such as a fixing bolt or a snap. To facilitate the connection of the device current line terminal 60 with the first and second connectors 20 and 30 and ensure a secure connection between the three, the device current line terminal 60 can be passed through the first and second through-holes 21 and 31 before the first and second connectors 20 and 30 are connected via the fixing member 40. The fixing member 40 then passes through the first and second through-holes 21 and 31, tightly fitting the device current line terminal 60 to the inner walls of the first and second through-holes 21 and 31. This achieves an electrical connection between the device current line terminal 60 and the first and second connectors 20 and 30, ensuring a secure connection and simplifying the connection process. By simultaneously connecting the device current line terminal 60 to the inner walls of the first and second through-holes 21 and 31, the current flow area of the connection device is increased. During a short-circuit test of the battery, heat generation on the connection device is reduced, preventing the connection device from melting or catching fire during the test, thus ensuring safety during the test.

[0049] See also Figure 1 and Figure 4 In combination with the above embodiments, in some embodiments, the connecting member 10 includes a main body portion 11 and a bending portion 12 .

[0050] The main body 11 is connected to one side of the first connector 20 along the length direction X, and the main body 11 is connected to the battery pole 50. The bending portion 12 is connected between the main body 11 and the second connector 30 to enable the second connector 30 to flip from the first position to the second position. It can be understood that the lap joint 10 is welded to the battery pole 50 through the main body 11 thereon, thereby achieving electrical connection. The second connector 30 is connected to the bending portion 12 on the lap joint 10. The bending portion 12 is a soft conductive structure, and the second connector 30 can be flipped from the first position to the second position through the bending portion 12. Of course, a conductive rotating structure can also be provided on the second connector 30. The rotating structure can be a hinge, a rotating shaft, etc. The rotating structure connects the second connector 30 to the main body 11. The bending portion 12 does not need to be provided, and the second connector 30 can also be moved from the first position to the second position.

[0051] See also Figure 1 、 Figure 2 and Figure 5 In combination with the above embodiments, in some embodiments, the main body 11 includes: a substrate 111 and a welding structure 112 .

[0052] The substrate 111 is connected between the first connector 20 and the bending portion 12. The welding structure 112 is connected to the substrate 111 and is used to weld the main body 11 and the battery pole 50. It can be understood that the substrate 111 on the main body 11 is connected to the first connector 20 and the bending portion 12 respectively, so that the current can be conducted between the first connector 20 and the substrate 111, and between the bending portion 12 and the substrate 111. A welding structure 112 is connected to the substrate 111, and the welding structure 112 and the battery pole 50 can be welded to achieve welding of the main body 11 and the battery pole 50, so that the current can be conducted between the battery pole 50 and the main body 11. The size of the cross-sectional area of the welding structure 112 can be adjusted as needed so as to be able to meet the current flow capacity of the welding point between the main body 11 and the battery pole 50. The welding structure 112 can be a block structure that is arranged along the thickness direction Y of the first connector 20 and passes through the substrate 111. One side of the welding structure 112 along the thickness direction Y contacts the surface of the battery post 50. The welding equipment (such as a resistance welder) welds the welding structure 112 and the battery post 50 together by penetration welding on the other side of the welding structure 112 along the thickness direction Y. The welding structure 112 can also be a surface structure. The welding structure 112 is arranged on the side of the substrate 111 away from the battery post 50, and the substrate 111 and the battery post 50 are attached. The welding equipment welds at the position of the welding structure 112 by penetration welding, so that the substrate 111 and the battery post 50 are welded. In this case, the welding structure 112 serves as a marker, making it easier for the welding equipment to set the range of the welding area.

[0053] See also Figure 1 、 Figure 6 and Figure 7In combination with the above embodiments, in some embodiments, the substrate 111 has a positioning hole 1111, which is provided through the substrate along the thickness direction Y. The positioning hole 1111 is used to correspond to the mating structure 51 on the battery post 50. It is understood that during the process of welding the body 11 and the battery post 50, the two need to be first fitted together, and then the position of the body 11 is adjusted so that the positioning hole 1111 corresponds to the mating structure 51 on the battery post 50. This allows the welding structure 112 to be positioned, and thus the welding position of the body 11 and the battery post 50 is positioned, so that the body 11 and the battery post 50 are welded at the appropriate position on the battery post 50 to avoid displacement of the welding position. Among them, the mating structure 51 on the battery post 50 can be a protruding structure, which can be snap-fitted with the positioning hole 1111 to achieve the positioning of the welding position of the body 11 and the battery post 50. The mating structure 51 may also be a hole structure, so that the positioning hole 1111 is connected to the hole structure to achieve the positioning of the welding position between the main body 11 and the battery terminal 50. The mating structure 51 can even be a mark made with a colored pen, so that the positioning hole 1111 is aligned with the colored mark to achieve the positioning of the welding position between the main body 11 and the battery terminal 50.

[0054] See also Figure 1 、 Figure 6 and Figure 7 In combination with the above embodiments, in some embodiments, the substrate 111 has a plurality of positioning holes 1111, and the plurality of positioning holes 1111 are arranged at intervals around the welding structure 112, and each positioning hole 1111 is arranged corresponding to a matching structure 51 on the battery post 50. It is understandable that a plurality of positioning holes 1111 can be provided on the substrate 111, and each positioning hole 1111 corresponds to the position of a matching structure 51 on the battery post 50. The greater the number of positioning holes 1111 and the number of matching structures 51 provided on the battery post 50, the more reference objects there are for positioning, thereby improving the positioning effect of the positioning holes 1111 and the matching structures 51, and more accurately positioning the welding position between the main body 11 and the battery post 50.

[0055] See also Figure 1 、 Figure 2 and Figure 3In combination with the above embodiments, in some embodiments, the bending portion 12 includes a plurality of thinning sheets 121. In the first position, the plurality of thinning sheets 121 are spaced apart along the thickness direction Y, and each thinning sheet 121 is connected between the main body 11 and the second connector 30. It is understood that the bending portion 12 can be composed of a plurality of spaced apart thinning sheets 121, and the thinning sheets 121 can be made of a conductive metal material with a certain degree of elasticity. The deformable thinning sheets 121 allow the second connector 30 connected to the thinning sheets 121 to be flipped from the first position to the second position, which facilitates the stacking of the first connector 20 and the second connector 30.

[0056] See also Figure 1 、 Figure 2 and Figure 3 In combination with the above embodiments, in some embodiments, the thinning sheet 121 is an integral structure with the main body 11 and the second connecting member 30. It is understandable that the thinning sheet 121 can be formed by opening a plurality of rectangular holes spaced apart along the thickness direction Y on the bending portion 12. After the plurality of rectangular grooves are opened, a plurality of thinning sheets 121 spaced apart along the thickness direction Y are formed on the bending portion 12. The thinning sheet 121 is integrally formed with the main body 11 and the second connecting member 30, which can reduce the processing steps. There is no need to process multiple thinning sheets 121 separately and then weld the multiple thinning sheets 121 to the main body 11 and the second connecting member 30 respectively. At the same time, the connection strength between the thinning sheet 121 and the main body 11, as well as the thinning sheet 121 and the second connecting member 30, can be improved, thereby reducing the probability of breakage at the connection between the three.

[0057] A detection device includes the above-mentioned connecting device. The detection device has all the technical features and beneficial effects of the above-mentioned connecting device, which will not be described in detail here.

[0058] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] The above is a detailed introduction to the connection device and detection equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A connecting device, characterized in that: Used to connect the battery pole and the equipment current line terminal, the connecting device includes: A connecting piece connected to the battery pole; a first connecting member connected to one side of the connecting member; a second connecting member connected to a side of the bridging member facing away from the first connecting member; The second connecting member has a first position and a second position. In the first position, the second connecting member is spaced apart from the first connecting member along the length direction; in the second position, the second connecting member is located on one side of the first connecting member along the thickness direction, and the two are connected so that both the first connecting member and the second connecting member are connected to the device current line terminal.

2. The connecting device according to claim 1, characterized in that The connecting device meets the following requirements: 8.24cm 2 ≤S1+S2≤11.74cm 2 ; Wherein, S1 is the orthographic projection area of the first connecting member on a plane perpendicular to the longitudinal direction, and S2 is the orthographic projection area of the second connecting member on a plane perpendicular to the longitudinal direction.

3. The connecting device according to claim 1, characterized in that The first connecting member has a first through hole, the second connecting member has a second through hole, and in the second position, the first through hole is connected to the second through hole; the connecting device includes: A fixing member, in the second position, is passed through the first through hole and the second through hole, and the fixing member connects the device current line terminal with the first connecting member and the second connecting member.

4. The connecting device according to claim 1, characterized in that The connecting piece includes: a main body connected to one side of the first connector along the length direction, the main body being connected to the battery post; The bending portion is connected between the main body and the second connecting member to enable the second connecting member to flip from the first position to the second position.

5. The connecting device according to claim 4, characterized in that The main body comprises: a substrate connected between the first connecting member and the bending portion; The welding structure is provided on the substrate and is used for welding the main body and the battery pole.

6. The connecting device according to claim 5, characterized in that The substrate has a positioning hole, which is arranged to penetrate along the thickness direction and is used to correspond to the matching structure on the battery pole.

7. The connection device according to claim 6, characterized in that The substrate has a plurality of positioning holes, which are arranged at intervals around the welding structure, and each positioning hole is arranged corresponding to one of the matching structures on the battery pole.

8. The connecting device according to claim 4, characterized in that The bending portion includes a plurality of thinning sheets. At the first position, the plurality of thinning sheets are spaced apart along the thickness direction, and each of the thinning sheets is connected between the main body and the second connecting member.

9. The connecting device according to claim 8, characterized in that The thinning sheet, the main body and the second connecting member are an integrated structure.

10. A detection device, characterized in that: Comprising the connecting device according to any one of claims 1 to 9.

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