Welding detection device and battery production line

Abstract

The utility model discloses a welding detection device, which comprises a rack, a detection position, a detection device and a detection device, wherein the detection position is arranged above the rack and is used for placing a battery pack welded with a post terminal; the air pressure detection head is arranged above the detection position, and the air pressure detection head is provided with a detection cavity used for sealing the pole; the vacuumizing mechanism is communicated with the air pressure detection head; the lifting driving part is arranged above the detection position, and the lifting driving part is used for driving the air pressure detection head to lift relative to the detection position; the lifting driving piece drives the air pressure detection head to be attached to the surface of the battery pack, after the detection cavity is sealed, the vacuumizing mechanism vacuumizes the detection cavity into a vacuum state, then vacuumizing is stopped, and the air pressure detection head detects the air pressure value in the detection cavity, so that whether pseudo soldering exists in battery cell pole welding or not is judged; if cold solder joint occurs, the air pressure value in the detection cavity can be changed; and if no pseudo soldering exists, the air pressure value in the detection chamber is kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and processing equipment, in particular to a welding detection device and a battery production line. Background Art

[0002] Lithium batteries, as efficient energy storage devices, are widely used in modern electronic products. During lithium battery manufacturing, the welding process between the battery pack and the cell terminals is a critical step in ensuring battery performance and safety. However, this process is plagued by a common problem: cold solder joints. Cold solder joints occur when a weld is not as strong as expected, resulting in an unstable electrical connection. This condition can lead to the following problems:

[0003] 1. The current transmission efficiency is reduced, affecting the overall performance of the battery;

[0004] 2. The electrical connection between the cell pole and the battery pack is unstable, which may cause local overheating under high current working conditions and increase the risk of thermal runaway;

[0005] 3. The cold solder joints are easy to break during the battery charging and discharging process, shortening the battery life;

[0006] 4. Cold soldering may cause battery short circuit or open circuit, posing a potential safety risk;

[0007] In order to avoid cold solder joints and ensure the quality and safety of lithium batteries, the following two detection methods are currently used to detect whether the battery cell poles are cold soldered:

[0008] CCD visual inspection: This method uses a high-resolution CCD camera to capture images of the weld point and uses image processing technology to identify weld defects. This method can achieve automated inspection and reduce human interference; however, CCD visual inspection systems are not only expensive but also prone to false detection.

[0009] Manual visual inspection: Trained workers visually inspect welds to identify cold welds or other welding defects. However, manual visual inspection is also very costly, and long hours of visual inspection can easily lead to worker fatigue, affecting detection accuracy. Utility Model Content

[0010] In order to overcome the deficiencies of the prior art, the utility model provides a low-cost welding detection device and a battery capable of detecting cold welds.

[0011] The first technical solution adopted by the utility model to solve its technical problem is:

[0012] A welding detection device, comprising:

[0013] A rack, with a detection position for placing the battery pack with welded poles on top of the rack;

[0014] An air pressure detection head is provided above the detection position, and the air pressure detection head is provided with a detection cavity for sealing the pole;

[0015] a vacuum pumping mechanism, which is connected to the air pressure detection head;

[0016] A lifting drive member, which is provided above the detection position and is used to drive the air pressure detection head to rise and fall relative to the detection position;

[0017] The lifting drive member can drive the air pressure detection head to fit with the surface of the battery pack to seal the detection cavity, and the vacuuming mechanism can vacuum the detection cavity. The air pressure detection head is used to detect the air pressure changes in the detection cavity.

[0018] The welding detection device as described above further includes a mounting frame, on which a plurality of the air pressure detection heads are mounted, and the output end of the lifting drive member is connected to the mounting frame;

[0019] The lifting drive member can drive the multiple air pressure detection heads to rise and fall synchronously.

[0020] In the welding detection device as described above, a plurality of lifting drive members are connected to one mounting frame.

[0021] The welding detection device as described above further includes a gantry frame arranged above the frame, and the fixed end of the lifting drive member is arranged on the gantry frame.

[0022] In the welding detection device as described above, the battery pack is provided with two rows of poles; and the mounting frame is provided with two rows of air pressure detection heads corresponding to the two rows of poles respectively.

[0023] The welding detection device as described above further includes a connecting plate and an auxiliary sliding mechanism provided above the gantry, wherein the auxiliary sliding mechanism includes a first sliding guide rod, a second sliding guide rod and a connecting member;

[0024] The connecting plate is provided with a connecting hole for the output end of the lifting drive member to pass through; the output end of the lifting drive member is arranged perpendicular to the upper surface of the frame;

[0025] A first sliding hole and a second sliding hole are respectively provided on the connecting plate and located on both sides of the connecting hole;

[0026] The first sliding guide rod is slidably provided in the first sliding hole;

[0027] The second sliding guide rod is slidably provided in the second sliding hole;

[0028] One end of the connecting member is fixedly connected to the first sliding guide rod, and the other end of the connecting member is fixedly connected to the second sliding guide rod;

[0029] One end of the first sliding guide rod and one end of the second sliding guide rod are both fixedly connected to the mounting bracket.

[0030] As described above, the welding detection device further comprises a mounting cavity on the frame, the mounting cavity is arranged below the detection position, and the vacuum pumping mechanism is arranged in the mounting cavity.

[0031] As described above, in the welding detection device, a rolling element capable of driving the frame to move is further provided below the frame.

[0032] In the welding detection device as described above, the vacuum pumping mechanism includes an airtightness tester.

[0033] The second technical solution adopted by the present invention to solve its technical problem is:

[0034] A battery production line comprises the above-mentioned welding detection device.

[0035] The beneficial effects of the utility model are:

[0036] The lifting drive member drives the air pressure detection head to fit into the surface of the battery pack. After the detection cavity is sealed, the vacuum mechanism draws the detection cavity into a vacuum state, and then stops vacuuming. The air pressure detection head detects the air pressure value in the detection cavity to determine whether there is a cold weld in the battery cell pole welding; if there is a cold weld, the air pressure value in the detection cavity will change; if there is no cold weld, the air pressure value in the detection cavity remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Figure 1 This is one of the three-dimensional structural diagrams of the in-installation welding detection device of the utility model;

[0039] Figure 2 yes Figure 1 A magnified view of the structure of part A;

[0040] Figure 3 This is a front view of the welding detection device in the utility model;

[0041] Figure 4 This is the second schematic diagram of the three-dimensional structure of the welding detection device in the utility model;

[0042] Figure 5 yes Figure 4 A magnified view of the structure of part B;

[0043] The reference numerals in this specification are as follows:

[0044] Frame 1, detection position 11, installation cavity 12, air pressure detection head 2, battery pack 22, detection cavity 23, vacuum mechanism 3, lifting drive component 4, mounting frame 5, gantry 6, connecting plate 61, first sliding hole 611, second sliding hole 612, auxiliary sliding mechanism 7, first sliding guide rod 71, connecting member 72, second sliding guide rod 73, rolling member 8. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0046] Reference Figure 1 、 Figure 2 , a welding detection device, comprising: a frame 1, a detection position 11 for placing a battery pack 22 with welded poles on the frame 1;

[0047] An air pressure detection head 2 is provided above the detection position 11 and is provided with a detection cavity 23 for sealing the pole;

[0048] A vacuum pumping mechanism 3, which is connected to the air pressure detection head 2;

[0049] a lifting drive member 4, which is disposed above the detection position 11 and is used to drive the air pressure detection head 2 to move up and down relative to the detection position 11;

[0050] The lifting drive 4 can drive the air pressure detection head 2 to fit the surface of the battery pack 22 to seal the detection cavity 23. The vacuum mechanism 3 can vacuum the detection cavity 23. The air pressure detection head 2 can be used to detect the air pressure changes in the detection cavity 23.

[0051] Specifically, the air pressure detection head 2 detects the air pressure change in the detection cavity 23, which means that a detection structure can be provided in the air pressure detection head 2, or the air pressure detection head 2 can be connected to the detection structure.

[0052] The principle of this device for detecting whether the pole is poorly soldered is as follows:

[0053] The lifting drive 4 drives the air pressure detection head 2 to fit with the surface of the battery pack 22. After the detection cavity 23 is sealed, the vacuum mechanism 3 draws the detection cavity 23 into a vacuum state, and then the vacuum mechanism 3 stops vacuuming; the air pressure detection head 2 detects the air pressure value in the detection cavity 23, so as to determine whether there is a cold weld in the battery cell pole welding; if there is a cold weld, the air pressure value in the detection cavity 23 will change; if there is no cold weld, the air pressure value in the detection cavity 23 remains stable; compared with the CCD visual inspection system, this device has a lower manufacturing cost; compared with manual visual inspection, the labor cost is low and the detection accuracy is higher.

[0054] Preferably, the lifting drive member 4 can be a cylinder or a motor; the vacuum pumping mechanism 3 is an airtightness meter. When the vacuum pumping mechanism 3 is an airtightness meter, since the airtightness meter has the functions of vacuuming and detecting air pressure changes, the airtightness meter can also be connected to the air pressure detection head 2. The airtightness meter can not only vacuum the detection chamber 23, but also detect the air pressure changes in the detection chamber 23.

[0055] Furthermore, it includes a mounting frame 5, on which a plurality of the air pressure detection heads 2 are mounted, and the output end of the lifting drive member 4 is connected to the mounting frame 5; the setting of the mounting frame 5 can fix the positional relationship of the adjacent air pressure detection heads 2 and prevent the air pressure detection heads from moving during the lifting process; the mounting frame 5 can be provided with a plurality of mounting holes, and after the air pressure detection heads 2 pass through the mounting holes, they are fixed to the mounting frame 5 using conventional fixing structures such as screws;

[0056] The lifting drive member 4 can drive the multiple air pressure detection heads 2 to rise and fall synchronously, and can detect the cold welding conditions of the poles in batches at one time, thereby improving the detection efficiency.

[0057] Specifically, a plurality of lifting drive members 4 are connected to one mounting frame 5. Compared with only one lifting drive member 4, the provision of multiple lifting drive members 4 can provide multiple support points to the mounting frame 5, and the auxiliary mounting frame 5 drives the air pressure detection head 2 to operate smoothly.

[0058] Preferably, the plurality of lifting drive members 4 are distributed along the length direction of the mounting frame 5 .

[0059] More specifically, the device further includes a gantry 6 disposed above the frame 1, and the fixed end of the lifting drive member 4 is disposed on the gantry 6. The gantry 6 can bear the weight of the lifting drive member 4 and the air pressure detection head 2. Placing the lifting drive member 4 and the air pressure detection head 2 above the frame 1 can reduce the footprint of the device.

[0060] Preferably, the two supporting points connecting the gantry 6 and the frame 1 are located on both sides of the detection position 11 ; the lifting drive member 4 and the air pressure detection head 2 are both arranged directly above the detection position 11 .

[0061] Specifically, the battery pack 22 is provided with two rows of poles; the mounting frame 5 is provided with two rows of air pressure detection heads 2 corresponding to the two rows of poles.

[0062] More specifically, it also includes a connecting plate 61 and an auxiliary sliding mechanism 7 provided above the gantry 6. The auxiliary sliding mechanism 7 includes a first sliding guide rod 71, a second sliding guide rod 73 and a connecting member 72.

[0063] The connecting plate 61 is provided with a connecting hole for the output end of the lifting drive member 4 to pass through; the output end of the lifting drive member 4 is arranged perpendicular to the upper surface of the frame 1;

[0064] The connecting plate 61 is provided with a first sliding hole 611 and a second sliding hole 612 on both ends of the connecting hole.

[0065] The first sliding guide rod 71 is slidably disposed in the first sliding hole 611;

[0066] The second sliding guide rod 73 is slidably disposed in the second sliding hole 612;

[0067] One end of the connecting member 72 is fixedly connected to the first sliding guide rod 71 , and the other end of the connecting member 72 is fixedly connected to the second sliding guide rod 73 ;

[0068] One end of each of the first sliding guide rod 71 and the second sliding guide rod 73 is fixedly connected to the mounting bracket 5 .

[0069] When the output end of the lifting drive member 4 extends to drive the mounting bracket 5 to move toward the battery pack 22, the first sliding guide rod 71 slides in the first sliding hole 611, and the second sliding guide rod 73 slides in the second sliding hole 612; since the first sliding hole 611 and the second sliding hole 612 are arranged on both sides of the lifting drive member 4, that is, the first sliding guide rod 71 and the second sliding guide rod 73 are arranged on both sides of the output end of the lifting drive member 4, the mounting bracket 5 can be assisted to drive the air pressure detection head 2 to move smoothly. At this time, the auxiliary sliding mechanism 7 also has a guiding function.

[0070] Furthermore, the frame 1 is provided with an installation cavity 12, which is provided below the detection position 11, and the vacuum pumping mechanism 3 is provided in the installation cavity 12. The provision of the installation cavity 12 improves the integration of the device.

[0071] Furthermore, a rolling member 8 is provided below the frame 1 to drive the frame 1 to move. The rolling member 8 can be any common rolling structure in the prior art, such as a wheel, a pulley, etc. The provision of the rolling member 8 can facilitate the movement of the device and can facilitate the movement of the device to the desired working space, such as for use in combination with any ring in the lithium battery testing environment.

[0072] The utility model also provides a battery production line, comprising a welding detection device of any of the above structures, so that the battery production line has fewer battery cold welds, has good overall battery performance, a long battery life, and is safer.

[0073] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A welding detection device, characterized in that: include: A frame (1), wherein a detection position (11) is provided above the frame (1) for placing a battery pack (22) with welded poles; An air pressure detection head (2) is arranged above the detection position (11), and the air pressure detection head (2) is provided with a detection cavity (23) for sealing the pole; a vacuum pumping mechanism (3), which is connected to the air pressure detection head (2); A lifting drive member (4) is provided above the detection position (11), and the lifting drive member (4) is used to drive the air pressure detection head (2) to rise and fall relative to the detection position (11); The lifting drive member (4) can drive the air pressure detection head (2) to fit with the surface of the battery pack (22) to seal the detection cavity (23); the vacuuming mechanism (3) can vacuum the detection cavity (23); and the air pressure detection head (2) is used to detect air pressure changes in the detection cavity (23).

2. The welding detection device according to claim 1, wherein: It also includes a mounting frame (5), on which a plurality of the air pressure detection heads (2) are mounted, and the output end of the lifting drive member (4) is connected to the mounting frame (5); The lifting drive member (4) can drive the plurality of air pressure detection heads (2) to rise and fall synchronously.

3. The welding detection device according to claim 2, wherein: A plurality of lifting drive members (4) are connected to one mounting frame (5).

4. The welding detection device according to claim 2 or 3, characterized in that: It also includes a gantry (6) arranged above the frame (1), and the fixed end of the lifting drive member (4) is arranged on the gantry (6).

5. The welding detection device according to claim 3, wherein: The battery pack (22) is provided with two rows of poles; the mounting frame (5) is provided with two rows of air pressure detection heads (2) corresponding to the two rows of poles.

6. The welding detection device according to claim 4, wherein: It also includes a connecting plate (61) and an auxiliary sliding mechanism (7) arranged above the gantry (6), wherein the auxiliary sliding mechanism (7) includes a first sliding guide rod (71), a second sliding guide rod (73) and a connecting member (72); The connecting plate (61) is provided with a connecting hole for the output end of the lifting drive member (4) to pass through; the output end of the lifting drive member (4) is arranged perpendicular to the upper surface of the frame (1); A first sliding hole (611) and a second sliding hole (612) are respectively provided on the connecting plate (61) and located on both sides of the connecting hole; The first sliding guide rod (71) is slidably provided in the first sliding hole (611); The second sliding guide rod (73) is slidably provided in the second sliding hole (612); One end of the connecting member (72) is fixedly connected to the first sliding guide rod (71), and the other end of the connecting member (72) is fixedly connected to the second sliding guide rod (73); One end of each of the first sliding guide rod (71) and the second sliding guide rod (73) is fixedly connected to the mounting frame (5).

7. The welding detection device according to claim 1, wherein: The frame (1) is further provided with an installation cavity (12), the installation cavity (12) is located below the detection position (11), and the vacuum pumping mechanism (3) is arranged in the installation cavity (12).

8. The welding detection device according to claim 1, wherein: A rolling element (8) capable of driving the frame (1) to move is also provided below the frame (1).

9. The welding detection device according to claim 1, wherein: The vacuum pumping mechanism (3) includes an airtightness meter.

10. A battery production line, characterized in that: The production line includes the welding detection device according to any one of claims 1 to 9.

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