CN218272739U

CN218272739U - Welding detection device

Info

Publication number: CN218272739U
Application number: CN202222120430.XU
Authority: CN
Inventors: 赵森; 徐广�
Original assignee: Zhongchuangxin Aviation New Energy Xiamen Co ltd; China Lithium Battery Technology Co Ltd
Current assignee: Zhongchuangxin Aviation New Energy Xiamen Co ltd; China Lithium Battery Technology Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2023-01-10
Anticipated expiration: 2032-08-12

Abstract

The utility model relates to a check out test set technical field especially relates to a welding detection device. The device comprises a negative pressure system, a power element, an adjusting frame and a plurality of detection assemblies, wherein the detection assemblies are connected with the negative pressure system and can be abutted against a bus bar to detect the sealing pressure at a welding seam; the power element is fixedly connected with the detection assembly and is configured to drive the detection assembly to move relative to the bus bar; the adjusting frame is used for bearing the detection assembly or the power element, and the detection assembly can slide relative to the adjusting frame. The distance between a plurality of determine module can be adjusted to the alignment jig, and the welding seam distance between the battery module is different, can directly adjust the detection needs of distance between the determine module in order to be applicable to the battery module welding seam, so can make the welding detection device that provides be applicable to different battery modules in this embodiment, need not change the welding detection device who corresponds when detecting different battery module welding seams, improved welding detection device's commonality.

Description

Welding detection device

Technical Field

The utility model relates to a check out test set technical field especially relates to a welding detection device.

Background

When the rosin joint takes place for the welding seam between busbar and the battery utmost point post among the battery module, will influence battery module product quality, and the detection of busbar welding seam rosin joint has certain degree of difficulty, conventional visual detection and electrical property test are difficult to effectively detect out the rosin joint, lead to judging firm reliability by staff's individual full inspection after battery module welding accomplishes, this kind of method needs a large amount of manpowers, but artifical detection efficiency is low, and is with high costs, and the missed-examination risk ratio is great, adopt artifical detection still to destroy the point that has welded well easily simultaneously.

Therefore, in the prior art, the detection of the welding position is realized by adopting a vacuum negative pressure mode. However, the height and width of the batteries in the modules of different models are different, so that the sealing head cannot be changed along with the batteries of different heights and widths, and the welding detection device is not suitable for detecting the welding seams of the battery modules of different models.

Therefore, a welding inspection apparatus is needed to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a welding detection device can be applicable to the welding seam detection of the battery module of different models.

To achieve the purpose, the utility model adopts the following technical proposal:

a weld detection device comprising:

a negative pressure system;

the detection assemblies are connected with the negative pressure system and can be abutted with the conductive bar or the bus bar to detect the sealing pressure at the welding seam;

a power element fixedly connected with the detection assembly, wherein the power element is configured to drive the detection assembly to move relative to the conductive bar or the bus bar;

and the adjusting frame is used for bearing the detection assembly or the power element, and the detection assembly can slide relative to the adjusting frame.

The utility model discloses beneficial effect:

the detection assembly can be abutted against the welding seam of the conductive bar or the bus bar, the negative pressure system extracts air from the welding seam, and whether the cold joint occurs at the welding seam is determined by detecting the sealing pressure at the detection assembly. Power component and determine module fixed connection, power component provides drive power for determine module, and determine module slides for the alignment jig to change the distance between the determine module, the welding seam distance between different battery module is different like this, can directly adjust the detection needs of distance between the determine module in order to be applicable to different battery module welding seams, so can make the utility model provides a welding detection device is applicable to different battery modules, need not change the welding detection device who corresponds when detecting time measuring to different battery module welding seams, has improved welding detection device's commonality.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a welding detection apparatus provided in an embodiment of the present invention;

fig. 3 is a schematic view illustrating a connection between a power element and a detection assembly according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a welding detection apparatus provided by the embodiment of the present invention;

fig. 5 is a cross-sectional view of a detection assembly provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of a position relationship of the welding detection device when detecting at the battery module according to the embodiment of the present invention.

In the figure:

1. a detection component; 11. a sealing head; 111. a negative pressure hole; 12. briquetting; 121. air holes; 13. a gas pipe joint;

2. a power element; 21. adjusting the groove;

3. an adjusting bracket; 31. a support frame; 311. a bottom support plate; 312. a vertical mounting rack; 3121. a second direction adjustment groove; 32. a first direction mounting bracket; 321. a first direction adjustment plate; 3211. a first direction adjustment groove; 322. a second direction adjustment plate; 3221. a fixing hole; 33. a first locking member; 331. a first bolt; 332. a first nut; 34. a second locking member;

10. a bus bar; 101. welding a positioning hole; 102. welding;

20. and (4) a pole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

As shown in fig. 1, a circular welding seam 102 may exist after welding the conductive bar or the bus bar 10, a virtual welding seam 102 may occur after welding the conductive bar or the bus bar 10 of the battery module in the prior art, and although the quality of the welding seam 102 can be detected by the existing detection device for detecting the pressure of the welding seam, the height and the width of the battery in the modules of different models and sizes are different, so that the detection device of the corresponding size needs to be replaced when welding the battery modules of different models each time, and the purpose of detection can be achieved.

In order to solve the problem, the embodiment of the utility model provides a welding detection device is provided, can be applicable to the not unidimensional battery module of different models.

As shown in fig. 2 and 4, the welding detection apparatus includes a negative pressure system, a power element 2, an adjusting bracket 3 and a plurality of detection assemblies 1, wherein the negative pressure system provides negative pressure for the detection assemblies 1, the detection assemblies 1 are connected with the negative pressure system, and the detection assemblies 1 can be abutted with a conductive bar or a bus bar 10 to detect the sealing pressure at the welding seam 102; the power element 2 is fixedly connected with the detection assembly 1, and the power element 2 is configured to drive the detection assembly 1 to move relative to the conductive bar or the bus bar 10; the adjusting frame 3 is used for carrying the detecting component 1 or the power element 2, and the detecting component 1 can slide relative to the adjusting frame 3.

The detection assembly 1 can be abutted against the welding seam 102 on the conductive bar or the welding seam 102 arranged on the bus bar 10, the negative pressure system can exhaust air at the welding seam 102, and whether the cold welding condition occurs at the welding seam 102 or not can be determined by detecting the sealing pressure at the detection assembly 1. Power component 2 and determine module 1 fixed connection, power component 2 provides drive power for determine module 1, a plurality of determine modules 1 can slide for alignment jig 3, thereby change the distance between the determine module 1, like this when the welding seam 102 distance between the different battery modules is different, but the distance between the direct adjustment determine module 1 is in order to be applicable to the detection needs of different battery module welding seams 102, so can make the welding detection device that provides in this embodiment be applicable to different battery modules, need not change the welding detection device who corresponds when detecting different battery module welding seams 102, the commonality of welding detection device has been improved.

In the present embodiment, the inspection assembly 1 is used to inspect a weld 102 on a busbar 10.

For the convenience of adjustment, a plurality of power elements 2 are arranged in one-to-one correspondence with a plurality of detection assemblies 1.

In this embodiment, as shown in fig. 4, the adjusting bracket 3 includes a supporting bracket 31 and a first direction mounting bracket 32, wherein the first direction mounting bracket 32 forms an accommodating space, so that the plurality of power elements 2 can be slidably disposed in the accommodating space along the first direction, and both ends of the first direction mounting bracket 32 are connected to the supporting bracket 31. Because a plurality of power components 2 can slide and set up in the accommodation space, can carry out position control according to the distance of different battery module welding seams 102 department like this when actual detection to make power component 2 be applicable to different battery modules.

The first direction mounting bracket 32 is provided with a first direction adjustment groove 3211, a length direction of the first direction adjustment groove 3211 is the same as a length direction of the first direction mounting bracket 32, and each power member 2 is locked to the first direction mounting bracket 32 by a first locking member 33. Specifically, two first direction adjustment grooves 3211 are oppositely disposed on the first direction mounting bracket 32, a first locking member 33 is disposed in each first direction adjustment groove 3211, and the two first locking members 33 are engaged with each other to lock one power element 2 on the first direction mounting bracket 32.

For example, as shown in fig. 3, the first locking member 33 includes a first bolt 331 and a first nut 332, wherein a head of the first bolt 331 and the first nut 332 are located at two ends of the first direction adjustment groove 3211, and the head of the first bolt 331 and the first nut 332 cooperate with each other to achieve a purpose that the first bolt 331 and the first nut 332 clamp the first direction mounting bracket 32, so that a position of the first bolt 331 can be defined, one end of the first bolt 331, which penetrates through the first nut 332, can abut against the power element 2, and when two opposite side walls of the power element 2 are both abutted by the bolt, a purpose that the first locking member 33 locks a position of the power element 2 can be achieved.

Specifically, the two ends of the first direction mounting frame 32 are slidably connected with the supporting frame 31 along the second direction, so that the power elements 2 can slide in the first direction and the second direction to adjust the distance, and the first direction and the second direction form an included angle, so that the power elements 2 can be adjusted in different directions. It should be noted that, since the power element 2 is fixedly connected to the detecting component 1, and the power elements 2 correspond to the detecting components 1 one by one, adjusting the position of the power element 2 is actually adjusting the position of the detecting component 1.

It should be noted that the angle formed between the first direction and the second direction is any angle between 0 ° and 180 °, preferably the angle formed between the first direction and the second direction is 30 ° to 120 °, and more preferably the angle formed between the first direction and the second direction is 90 °.

In order to realize the purpose of detecting simultaneously to more battery module, in order to improve detection efficiency, the quantity of first direction mounting bracket 32 is two at least, every first direction mounting bracket 32 and support frame 31 sliding connection, can realize adjusting the purpose of power component 2 position in first direction and second direction like this, because power component 2 and detecting component 1 one-to-one set up, can adjust the position of detecting component 1 alone like this, further improve this welding detection device's commonality.

For example, the first direction mounting bracket 32 includes a first direction adjustment plate 321 and a second direction adjustment plate 322, the two first direction adjustment plates 321 and the two second direction adjustment plates 322 enclose a rectangular receiving space, a first direction adjustment groove 3211 is disposed on the first direction adjustment plate 321, and a fixing hole 3221 is disposed on the second direction adjustment plate 322. The first direction adjustment plate 321 is disposed perpendicular to the vertical mounting frame 312.

Specifically, the second direction adjustment groove 3121 is provided on the support frame 31, and since the fixing hole 3221 is provided on the first direction mounting frame 32, the first direction mounting frame 32 is engaged with the fixing hole 3221 through the second locking member 34 to be locked on the support frame 31. For example, the second locking member 34 is a second bolt, the fixing hole 3221 is a threaded hole, one end of the second bolt passes through the second direction adjustment groove 3121 and then enters the fixing hole 3221, the second bolt is threadedly connected to the first direction mounting frame 32 through the fixing hole 3221, and the other end of the second locking member 34 abuts against the side wall of the supporting frame 31.

Of course, in some other embodiments, the fixing hole 3221 may be a light hole, and the second locking member 34 includes a second bolt and a second nut, one end of the second bolt passes through the second direction adjusting groove 3121 and the fixing hole 3221 and is screwed with the second nut, and the second bolt and the second nut cooperate to lock the first direction mounting bracket 32 on the supporting frame 31.

More specifically, two second direction adjusting grooves 3121 are relatively disposed on the supporting frame 31, two ends of the first direction mounting frame 32 are locked on the supporting frame 31 by the second locking members 34, and when the position of the first direction mounting frame 32 needs to be adjusted, the purpose of moving the first direction mounting frame 32 can be achieved after the second locking members 34 are released.

For example, the supporting frame 31 includes a bottom supporting plate 311 and two vertical mounting brackets 312, wherein the vertical mounting brackets 312 are vertically disposed on the bottom supporting plate 311, the two vertical mounting brackets 312 are disposed oppositely, and two ends of the first direction mounting bracket 32 are slidably connected with the two vertical mounting brackets 312 through the second locking members 34, respectively. The vertical mounting frame 312 is provided with a second direction adjusting groove 3121, one end of the second locking member 34 passes through the second direction adjusting groove 3121 and then is fixedly connected with the first direction mounting frame 32, the second locking member 34 is matched with the first direction mounting frame 32 to clamp the vertical mounting frame 312, so that the first direction mounting frame 32 can be prevented from moving at will, and when the position of the second direction needs to be adjusted, the second locking member 34 is released and unscrewed to drag the first direction mounting frame 32 to move to a specified position.

Because the battery module height of different models is different, in order to be applicable to the needs of not co-altitude battery module, all be provided with on every power component 2 in this embodiment and adjust recess 21, adjust recess 21's length direction and set up along the third direction, and first direction, second direction and third direction all are the contained angle setting. Each power element 2 is provided with two adjusting grooves 21, and the two adjusting grooves 21 are respectively arranged at two opposite side walls of the power element 2. The arrangement of the adjusting groove can ensure that the power element 2 can adjust the position of the table according to actual requirements in the third direction.

Specifically, the first direction, the second direction and the third direction are respectively arranged at 90 °, and it is understood that, among the first direction, the second direction and the third direction, the first direction is the X direction, the second direction is the Y direction, and the third direction is the Z direction. The first locking member 33 can abut against the adjusting groove 21, so that the position of the power element 2 in the third direction can be adjusted, and the detection assembly 1 can be suitable for battery modules with different heights.

In order to simplify the overall structure of the welding detection apparatus, in the present embodiment, the power element 2 includes air cylinders, and a plurality of air cylinders are provided in one-to-one correspondence with the plurality of detection assemblies 1. The cylinder can be applicable to not the not welding seam 102 of co-altitude when pushing down the determine module 1, and every determine module 1 all can realize good sealed with welding seam 102 like this, and the sealing pressure that the welding seam 102 department that every determine module 1 corresponds received is unanimous, the condition that partial position sealing pressure is not enough can not appear.

In other embodiments, the number of the power elements 2 is one, the power elements 2 include air cylinders, the detecting assembly can be slidably disposed in the first direction mounting frame 32 to form a receiving space, the air cylinders have air cylinder rods connected to the first direction mounting frame 32, and the detecting assembly 1 is fixed relative to the first direction mounting frame 32 during operation, so that the air cylinders drive the first direction mounting frame 32 to move toward the weld and make the detecting assembly 1 fit to the weld 102.

It should be noted that the selected cylinder type should meet the sealing pressure requirement, and the size of the cylinder should meet the equipment installation requirement.

In other embodiments, the power mechanism may include a screw rod, a nut and a driving motor, the nut is screwed on the screw rod, and the nut is connected with the detection assembly 1; the driving motor is used for driving the screw rod to rotate. In this way, the sealing pressure applied to the corresponding welding seam 102 of each detection assembly 1 is consistent, and the detection assembly 1 and the welding seam 102 are well sealed.

In the present embodiment, as shown in fig. 5 and 6, the detecting assembly 1 includes a sealing head 11, and the plurality of power elements 2 are disposed in one-to-one correspondence with the plurality of sealing heads 11. The sealing head 11 can achieve good sealing between the battery module and the sealing head after the welding seam 102 is compressed. The sealing head 11 is, for example, a rubber sealing head or a silicone sealing head. Of course, in other embodiments, the sealing head 11 may be made of resin, plastic, foam, etc. with good elastic deformation and sealing capability. The above materials can ensure that the surface of the welding seam 102 between the sealing head 11 and the conductive bar or bus bar 10 can achieve a good sealing state under a certain sealing pressure.

In order to be able to draw out air at the weld 102, the sealing head 11 is provided with a negative pressure hole 111, the negative pressure hole 111 is connected with a negative pressure system, and the sealing head 11 can completely cover the welding positioning hole 101 and the weld 102 on the conductive bar or the bus bar 10. This can avoid the situation that the weld joint 102 is exposed outside the sealing head 11, which results in inaccurate detection results.

In the present embodiment, the negative pressure hole 111 can completely cover the welding positioning hole 101, i.e., the diameter of the negative pressure hole 111 is larger than that of the welding positioning hole 101, and the diameter of the negative pressure hole 111 is smaller than the inner diameter of the weld 102. This provides a good seal during inspection and also prevents the weld 102 from being damaged by the high suction forces.

Since the sealing head 11 has a certain deformation after being pressed, the sealing head 11 may be blocked due to the deformation of the negative pressure hole 111 after being pressed by the power element 2, and for this reason, in this embodiment, the detecting assembly 1 further includes a pressing block 12, and the pressing block 12 is fixedly connected to the sealing head 11 and the power element 2, respectively. The pressing block 12 can uniformly apply the acting force applied by the power element 2 to all positions of the sealing head 11, so that the sealing head 11 is uniformly stressed and cannot be locally deformed greatly, and meanwhile, the sealing effect between the sealing head 11 and the welding seam 102 can be ensured.

The pressing block 12 and the sealing head 11 can be fixedly connected through a fastener, that is, the pressing block 12 and the sealing head 11 are of a split structure. Because the sealing head 11 is frequently compressed and released, the sealing head is easy to damage, only the sealing head 11 needs to be replaced during replacement, and the pressing block 12 and the sealing head 11 are of a split structure, so that the cost of replacing parts can be effectively reduced.

When the power element 2 is a cylinder, the pressing block 12 is fixedly connected with a cylinder rod of the cylinder. The press block 12 is made of a metal material, but the press block 12 may be made of a material having a good structural strength, such as plastic, wood, or ceramic. In order to realize the connection between the sealing head 11 and the negative pressure system, the pressing block 12 is provided with an air hole 121, the air hole 121 is communicated with the negative pressure hole 111 of the sealing head 11, and the air hole 121 and the negative pressure hole 111 form an air tightness detection channel. It should be noted that the air hole 121 is a hole with an L-shaped or T-shaped cross section, so that the pressing block 12 can be connected to the power element 2, the negative pressure system, and the sealing head 11 respectively.

In this embodiment, the sealing head 11 and the pressing block 12 may be connected by a mechanical matching structure, and the sealing property of the connection is ensured, and of course, the sealing head 11 and the pressing block 12 may also be connected by gluing, tenon-and-mortise structural connection, or the like.

Furthermore, the detecting assembly 1 further includes a gas pipe joint 13, one end of the gas pipe joint 13 is connected to the negative pressure system, the other end of the gas pipe joint 13 is connected to the pressing block 12, and the gas pipe joint 13 is communicated with the gas hole 121. The air pipe joint 13 serves the purpose of communicating the negative pressure system with the air hole 121 and the negative pressure hole 111.

In other embodiments, when there is one cylinder, the cylinder and the detecting assembly 1 are directly connected to the adjusting frame 3, and specifically, the detecting assembly 1 is slidably connected to the first direction mounting frame 32 through the pressing block 12.

During detection, the negative pressure hole 111 is respectively communicated with the air hole 121 and the welding positioning hole 101 arranged on the bus bar 10, and then negative pressure is pumped, so as to detect whether the welding seam 102 around the welding positioning hole 101 has a failure problem.

In addition, the foregoing is only a preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A weld detection device, comprising:

a negative pressure system;

a plurality of detection assemblies (1), wherein the detection assemblies (1) are connected with the negative pressure system, and the detection assemblies (1) can be abutted with a conductive bar or a bus bar (10) to detect the sealing pressure at a welding seam (102);

a power element (2) fixedly connected with the detection assembly (1), wherein the power element (2) is configured to drive the detection assembly (1) to move relative to the conductive bar or the bus bar (10);

an adjusting frame (3) for carrying the detecting component (1) or the power element (2), wherein the detecting component (1) can slide relative to the adjusting frame (3).

2. The welding detection device according to claim 1, characterized in that said adjusting carriage (3) comprises:

a support frame (31);

the first direction mounting rack (32) is formed with an accommodating space, the power elements (2) can be arranged in the accommodating space in a sliding mode along the first direction, the two ends of the first direction mounting rack (32) are connected with the supporting frame (31), and the power elements (2) and the detection assemblies (1) are arranged in a one-to-one correspondence mode.

3. The welding detection device according to claim 2, wherein the adjustment bracket (3) further comprises a first locking member (33) for fastening the power element (2) to the first direction mounting bracket (32).

4. The welding detection device according to claim 3, characterized in that a first direction adjustment groove (3211) is provided on the first direction mounting bracket (32), a length direction of the first direction adjustment groove (3211) is the same as a length direction of the first direction mounting bracket (32), and each power member (2) is locked to the first direction mounting bracket (32) by the first locking member (33).

5. The welding detection device according to claim 4, wherein the first direction mounting frame (32) comprises a first direction adjustment plate (321) and a second direction adjustment plate (322), two first direction adjustment plates (321) and two second direction adjustment plates (322) enclose a receiving space, and the first direction adjustment plate (321) is provided with the first direction adjustment groove (3211).

6. The welding detection device of claim 2, wherein the two ends of the first direction mounting frame (32) are slidably connected with the support frame (31) along a second direction, and the first direction and the second direction are arranged at an included angle.

7. The welding detection device according to claim 6, wherein the adjusting carriage (3) further comprises a second locking member (34) for locking the first direction mounting frame (32) to the support frame (31).

8. The welding detection device according to claim 7, characterized in that the supporting frame (31) comprises a bottom supporting plate (311) and a vertical mounting frame (312), the vertical mounting frame (312) is vertically arranged on the bottom supporting plate (311), the bottom supporting plate (311) is fixedly connected with the vertical mounting frame (312), a second direction adjusting groove (3121) is arranged on the vertical mounting frame (312), and the first direction mounting frame (32) is locked on the vertical mounting frame (312) through the second locking piece (34).

9. The welding detection device according to claim 6, characterized in that each power element (2) is provided with an adjusting groove (21), the length direction of the adjusting groove (21) is arranged along a third direction, and the first direction, the second direction and the third direction are arranged at an included angle.

10. The welding detection device according to claim 2, wherein at least two of the first direction mounts (32) are slidably connected to the support frame (31).

11. The welding detection device according to claim 1, wherein the power element (2) comprises a cylinder, and a plurality of cylinders are provided in one-to-one correspondence with a plurality of detection assemblies (1).

12. The welding detection device according to claim 1, characterized in that said detection assembly (1) comprises a sealing head (11), a plurality of said power elements (2) being arranged in a one-to-one correspondence with a plurality of said sealing heads (11);

the sealing head (11) is provided with a negative pressure hole (111), the negative pressure hole (111) is connected with the negative pressure system, and the sealing head (11) can completely cover the conductive bar or a welding positioning hole (101) and a welding seam (102) on the bus bar (10).

13. The welding detection device according to claim 12, wherein a diameter of the negative pressure hole (111) is larger than a diameter of the welding positioning hole (101), and a diameter of the negative pressure hole (111) is smaller than an inner diameter of the weld (102).

14. The welding detection device according to claim 12, wherein the detection assembly (1) further comprises a pressing block (12), the pressing block (12) is fixedly connected with the sealing head (11) and the power element (2), and the pressing block (12) is provided with an air hole (121), and the air hole (121) is communicated with the negative pressure hole (111).

15. The welding detection device according to claim 14, characterized in that the detection assembly (1) comprises a gas pipe connector (13), one end of the gas pipe connector (13) is connected with the negative pressure system, the other end of the gas pipe connector (13) is connected with the pressure block (12), and the gas pipe connector (13) is communicated with the gas hole (121).

16. The welding detection device according to claim 12, characterized in that the sealing head (11) is a rubber sealing head or a silicone sealing head.