Tab welding quality detection device
By designing an electrode welding quality inspection device that integrates thermal imaging and flattening functions, the problem of detecting poor welding was solved, the battery production efficiency and inspection accuracy were improved, and poorly welded batteries were prevented from being mixed in.
Patent Information
- Application Number
- CN202423197877.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing pressure-balancing devices cannot detect whether there are poor welds on the tabs after ultrasonic welding, resulting in defective batteries with poor welds being mixed with normal batteries.
A device for detecting electrode welding quality was designed, comprising a thermal imaging unit and a flat pressure unit. It determines poor welding by measuring the temperature of the electrode and performs short circuit detection by applying voltage through a probe, integrating flat pressure, poor welding and short circuit testing functions.
It enables effective detection of electrode tab welding quality, prevents poorly welded batteries from being mixed with normal batteries, improves production efficiency and detection accuracy, and reduces production time and space requirements.
Smart Images
Figure CN223770126U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of battery production equipment, and in particular to an electrode lug welding quality detection device. BACKGROUND
[0002] Lithium ion batteries are increasingly concerned by various industries and rapidly developed due to the advantages of large capacity, long cycle life and high cost performance.
[0003] In the production process of a lithium ion battery cell, the electrode lug needs to be flattened after ultrasonic welding to ensure the flatness of the electrode lug, but the existing flattening device cannot detect whether the electrode lug after ultrasonic welding is false welding, so that the waste battery with false welding and the normal battery are mixed together. CONTENT OF THE UTILITY MODEL
[0004] The application provides an electrode lug welding quality detection device to solve the problem that the electrode lug cannot be detected after ultrasonic welding.
[0005] The electrode lug welding quality detection device provided by the application comprises a thermal imaging part and a flattening part, the thermal imaging part can measure the temperature of the electrode lug of the battery cell to determine whether the electrode lug is false welding, and the flattening part can flatten the electrode lug.
[0006] In a possible design, the electrode lug welding quality detection device further comprises a probe, and the probe is used to apply voltage to the electrode lug when the flattening part flattens the electrode lug.
[0007] In a possible design, the flattening part comprises an upper pressing plate and a lower pressing plate, the upper pressing plate has a first plane for contacting the electrode lug, the lower pressing plate has a second plane for contacting the electrode lug, and the first plane and the second plane can respectively contact the upper and lower surfaces of the electrode lug and apply pressure to the electrode lug.
[0008] In a possible design, along a first direction, the probe and the thermal imaging part are arranged on the two sides of the flattening part, and the first direction is the length direction or the width direction of the electrode lug welding quality detection device.
[0009] In a possible design, when the probe contacts the electrode lug, the projection of the thermal imaging part on the battery cell is located on the main body of the battery cell, and the thermal imaging part can measure the temperature of the main body to determine whether the electrode lug is short-circuited.
[0010] In a possible design, the probe is arranged on the upper pressing plate, and the end of the probe for contacting the electrode lug protrudes from the first plane or is flush with the first plane.
[0011] In a possible design, the upper pressing plate is provided with a guide rail, and the probe is in sliding connection with the guide rail.
[0012] In a possible design, the tab welding quality detection device comprises a machine body, the machine body comprises a mounting portion, the mounting portion is provided with a first sliding rail extending in a second direction, the second direction is a height direction of the tab welding quality detection device; the upper pressing plate is provided with a first sliding groove matched with the first sliding rail, and the upper pressing plate is capable of sliding relative to the mounting portion in the second direction; and / or the lower pressing plate is provided with a second sliding groove matched with the first sliding rail, and the lower pressing plate is capable of sliding relative to the mounting portion in the second direction.
[0013] In a possible design, the flat pressing portion further comprises a first driving portion arranged on the mounting portion and capable of driving the upper pressing plate to slide in the second direction; and / or the flat pressing portion further comprises a second driving portion arranged on the mounting portion and capable of driving the lower pressing plate to slide in the second direction.
[0014] In a possible design, the machine body further comprises a base provided with a second sliding rail extending in a first direction, and the mounting portion is provided with a sliding block matched with the second sliding rail and capable of sliding relative to the base in the first direction.
[0015] In the present application, after the ultrasonic welding of the tab, the battery cell is moved to the tab welding quality detection device, at this time, the thermal imaging portion detects the temperature of the tab, if the temperature of the tab is low, it indicates that the temperature of the tab is limited during the ultrasonic welding process, the welding quality of the tab is poor, and there is a virtual welding, thereby realizing the detection of the welding quality of the tab, and preventing the battery cell with virtual welding and the battery cell with normal tab welding from being mixed together.
[0016] It should be understood that the foregoing general description and the following detailed description are only exemplary and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 FIG. 1 is a schematic structural view of a tab welding quality detection device provided in the present application;
[0018] Figure 2 FIG. 1 is a schematic structural view of a tab welding quality detection device provided in the present application;
[0019] Figure 3 FIG. 1 is a schematic structural view of a tab welding quality detection device provided in the present application; Figure 2 FIG. 1 is a schematic structural view of a tab welding quality detection device provided in the present application;
[0020] Figure 4 FIG. 1 is a schematic structural view of a tab welding quality detection device provided in the present application;Figure 2 FIG. 6 is a side view of the tab welding quality detection device in FIG. 1;
[0021] Figure 5 FIG. 7 is a sectional view of A-A of the tab welding quality detection device in FIG. 1. Figure 4
[0022] Reference Signs:
[0023] 1 - body;
[0024] 11 - mounting portion;
[0025] 111 - first sliding rail;
[0026] 112 - sliding block;
[0027] 12 - base;
[0028] 121 - second sliding rail;
[0029] 13 - protruding portion;
[0030] 2 - thermal imaging portion;
[0031] 3 - flat pressing portion;
[0032] 31 - upper pressing plate;
[0033] 311 - first plane;
[0034] 312 - guide rail;
[0035] 32 - lower pressing plate;
[0036] 321 - second plane;
[0037] 33 - first driving portion;
[0038] 34 - second driving portion;
[0039] 4 - probe;
[0040] 5 - battery cell;
[0041] 51 - main body;
[0042] 52 - tab.
[0043] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application. DETAILED DESCRIPTION
[0044] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0045] It should be noted that the embodiments described are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.
[0046] The terms used in the embodiments of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.
[0047] It should be understood that the term "and / or" used herein only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.
[0048] It should be noted that the "up", "down", "left", "right" and other directional words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element.
[0049] Figure 1 The structure of an electric core is shown. As shown in Figure 1 The electric core 5 includes a main body 51 for storing electric energy and a tab 52 for leading out electric energy. Two tabs 52 are arranged on the main body 51, which are positive and negative tabs respectively.
[0050] Figure 2 The structure of a tab welding quality detection device provided by the embodiments of the present application is shown. As shown in Figure 2 The tab welding quality detection device includes a thermal imaging part 2 and a flat pressing part 3. The thermal imaging part 2 can measure the temperature of the tab 52 of the electric core 5 to determine whether the tab 52 is false welding. The flat pressing part 3 can flat press the tab 52.
[0051] After ultrasonic welding of the tab 52, the cell 5 moves to the tab welding quality detection device. At this time, the thermal imaging unit 2 detects the temperature of the tab 52. If the temperature of the tab 52 is low, it means that the temperature rise of the tab 52 is limited during the ultrasonic welding process, the welding quality of the tab 52 is poor, and there is a cold weld. This allows for the detection of the welding quality of the tab 52 and prevents cells 5 with cold welds on the tab 52 from being mixed with cells 5 with normal tab welding.
[0052] For battery cells 5 with poor soldering of tab 52, they can be moved into the collection box for further processing; for battery cells 5 with normal soldering of tab 52, the flattening part 3 flattens the tab 52 to make the tab 52 more flat.
[0053] Understandably, since a battery cell 5 has two tabs 52, the thermal imaging unit 2 is also provided with two corresponding tabs 52.
[0054] To facilitate the description of the electrode welding quality inspection device, the length or width direction of the electrode welding quality inspection device is defined as the first direction X, the height direction of the electrode welding quality inspection device is defined as the second direction Y, and the direction perpendicular to the first direction X and the second direction Y is defined as the third direction Z.
[0055] Specifically, such as Figure 3 and Figure 4 As shown, the flat pressing part 3 includes an upper pressing plate 31 and a lower pressing plate 32. The upper pressing plate 31 has a first flat surface 311 for contacting the electrode tab 52, and the lower pressing plate 32 has a second flat surface 321 for contacting the electrode tab 52. The first flat surface 311 and the second flat surface 321 can respectively contact the upper and lower surfaces of the electrode tab 52 and apply pressure to the electrode tab 52 to achieve flat pressing of the electrode tab 52.
[0056] The first plane 311 and the second plane 321 are both parallel to the plane containing the first direction X and the third direction Z.
[0057] Optionally, the upper pressure plate 31 has two first planes 311 spaced apart along the third direction Z. The two first planes 311 correspond to the positive and negative tabs. When the upper pressure plate 31 approaches the tab 52, the two first planes 311 contact the positive and negative tabs respectively. It is understood that the upper pressure plate 31 may also have a larger first plane 311, so that when the upper pressure plate 31 approaches the tab 52, the first plane 311 contacts both the positive and negative tabs simultaneously. Similarly, the lower pressure plate 32 may have two second planes 321 spaced apart along the third direction Z, or it may have only one larger second plane 321.
[0058] Furthermore, such as Figure 2 and Figure 3As shown, the electrode welding quality inspection device includes: a body 1, which includes a mounting part 11. The mounting part 11 has a first slide rail 111 extending along a second direction Y. An upper pressure plate 31 has a first sliding groove that engages with the first slide rail 111, allowing the upper pressure plate 31 to slide relative to the mounting part 11 along the second direction Y. A lower pressure plate 32 has a second sliding groove that engages with the first slide rail 111, allowing the lower pressure plate 32 to slide relative to the mounting part 11 along the second direction Y.
[0059] When the battery cell 5 moves to the position of the tab 52 between the upper pressure plate 31 and the lower pressure plate 32, the upper pressure plate 31 and the lower pressure plate 32 can both move closer to the tab 52 along the second direction Y, and then flatten the tab 52.
[0060] Preferably, the first slide rail 111 is disposed on both sides of the mounting part 11 along the third direction Z, and the upper pressure plate 31 is provided with first sliding grooves at both ends along the third direction Z, so that the two ends of the upper pressure plate 31 along the third direction Z are respectively slidably connected to the two first slide rails 111, thereby making the connection between the upper pressure plate 31 and the mounting part 11 more stable, and the upper pressure plate 31 can slide relatively smoothly along the first slide rail 111.
[0061] Similarly, the lower pressure plate 32 is provided with second sliding grooves at both ends along the third direction Z, so that the lower pressure plate 32 is slidably connected to the two first slide rails 111 at both ends along the third direction Z, thereby making the connection between the lower pressure plate 32 and the mounting part 11 more stable, and the lower pressure plate 32 can slide relatively smoothly along the first slide rail 111.
[0062] Furthermore, such as Figure 2 As shown, the flat pressing part 3 further includes: a first driving part 33 and a second driving part 34. The first driving part 33 is disposed on the mounting part 11 and can drive the upper pressing plate 31 to slide along the second direction Y; the second driving part 34 is disposed on the mounting part 11 and can drive the lower pressing plate 32 to slide along the second direction Y.
[0063] Optionally, the first drive unit 33 is a first servo motor, the output shaft of which is connected to the upper pressure plate 31, and the second drive unit 34 is a second servo motor, the output shaft of which is connected to the lower pressure plate 32.
[0064] In another embodiment, the upper pressure plate 31 is slidably connected to the first slide rail 111, and the first driving part 33 can drive the upper pressure plate 31 to slide along the second direction Y. The lower pressure plate 32 is fixedly connected to the mounting part 11, and no second driving part 34 is provided. When the tab 52 is flattened, the tab 52 contacts the lower pressure plate 32, and the upper pressure plate 31 moves to the lower pressure plate 32 to apply pressure to the tab 52.
[0065] In another embodiment, the upper pressure plate 31 is fixedly connected to the mounting part 11, and the first driving part 33 is not provided. The lower pressure plate 32 is slidably connected to the first slide rail 111, and the second driving part 34 can drive the lower pressure plate 32 to slide along the second direction Y. When the tab 52 is flattened, the tab 52 contacts the upper pressure plate 31, and the lower pressure plate 32 moves to the upper pressure plate 31 to apply pressure to the tab 52.
[0066] In existing technologies, the flattening process and the short-circuit test process are performed separately by different devices. The transfer of the battery cell 5 between different devices takes a considerable amount of time, resulting in a long production time and low production efficiency for the battery cell 5. In particular, the short-circuit test is used to detect whether physical contact has occurred inside the battery cell 5, causing a short circuit. These internal short circuits can greatly affect the performance of the battery cell 5.
[0067] In one specific implementation, such as Figure 3 As shown, the tab welding quality inspection device also includes a probe 4. The probe 4 is used to apply voltage to the tab 52 when the flattening section 3 flattens the tab 52 to perform short-circuit detection. That is, the tab welding quality inspection device can perform the flattening process and the short-circuit test process simultaneously. Compared with the prior art, the battery cell 5 does not need to be transferred between two devices, thereby reducing the time required for battery cell 5 production and improving the efficiency of battery cell 5 production. In addition, the integrated short-circuit detection function of the tab welding quality inspection device also helps to reduce the space required for battery cell 5 production.
[0068] Specifically, the probe 4 is disposed on the upper pressure plate 31. The end of the probe 4 that is in contact with the tab 52 protrudes from the first plane 311 or is flush with the first plane 311, thereby ensuring that the probe 4 can contact the tab 52 when the upper pressure plate 31 and the lower pressure plate 32 apply flat pressure to the tab 52.
[0069] More specifically, there are two probes 4, which correspond to the positive and negative tabs respectively. When the upper pressure plate 31 and the lower pressure plate 32 flatten the tab 52, the two probes 4 abut against the positive and negative tabs respectively.
[0070] Preferred, such as Figure 5 As shown, the upper pressure plate 31 is provided with a guide rail 312 extending along the third direction Z. The probe 4 is slidably connected to the guide rail 312, so that the probe 4 can slide along the third direction Z to adjust the position of the probe 4 and ensure that the probe 4 can contact the tab 52 to perform short circuit detection on the tab 52.
[0071] Furthermore, along the first direction X, the probe 4 and the thermal imaging unit 2 are disposed on both sides of the flat pressure unit 3. After the thermal imaging unit 2 detects whether there is a poor solder joint on the tab 52, the entire cell 5 moves along the first direction X towards the direction of the pressure plate 31, so that the tab 52 can be flattened and short-circuited.
[0072] Optionally, the mounting part 11 is provided with a protrusion 13, and the thermal imaging part 2 is mounted on the protrusion 13.
[0073] During a short-circuit test on the tab 52, the probe 4 contacts the tab 52, and the projection of the thermal imaging unit 2 onto the cell 5 is located on the main body 51 of the cell 5. The thermal imaging unit 2 can measure the temperature of the main body 51 to determine whether the tab 52 is short-circuited. If a short circuit occurs, the probe 4 will detect a large current, and the temperature of the cell 5 will rise. Therefore, by measuring the temperature of the main body 51, the thermal imaging unit 2 can assist in determining whether a short circuit has occurred, improving the accuracy and reliability of the short-circuit test.
[0074] In the above embodiments, such as Figure 2 As shown, the body 1 also includes: a base 12, the base 12 having a second slide rail 121 extending along a first direction X, and a mounting part 11 having a slider 112, the slider 112 cooperating with the second slide rail 121, and the mounting part 11 being able to slide relative to the base 12 along the first direction X. The base 12 can be placed directly on the ground, and the base 12 can provide stable support for the mounting part 11.
[0075] After ultrasonic welding of the tab 52, the battery cell 5 moves to the tab welding quality inspection device. At this time, the tab 52 is located below the thermal imaging unit 2. The thermal imaging unit 2 can detect whether there is a cold solder joint on the tab 52 by measuring the temperature of the tab 52. If the tab 52 is welded normally, the mounting part 11 can move along the first direction X so that the tab 52 is located between the upper pressure plate 31 and the lower pressure plate 32, and the main body 51 is located below the thermal imaging unit 2. Then, the upper pressure plate 31 and the lower pressure plate 32 flatten the tab 52. At the same time, the probe 4 on the upper pressure plate 31 abuts against the tab 52 to perform a short circuit test. The thermal imaging unit 2 measures the temperature of the main body 51 to help determine whether a short circuit has occurred, thereby improving the accuracy of the short circuit test. Therefore, the tab welding quality inspection device provided in this application integrates the functions of cold solder joint detection, flattening the tab 52, and short circuit testing, which can greatly reduce the time required for battery cell 5 production and improve the efficiency of battery cell 5 production.
[0076] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A tab welding quality detection device, characterized by, The tab welding quality detection device comprises a thermal imaging part (2) and a flat pressing part (3), the thermal imaging part (2) can measure the temperature of the tab (52) of the battery cell (5) to determine whether the tab (52) is false welding; the flat pressing part (3) can flat press the tab (52).
2. The tab weld quality detection apparatus according to claim 1, characterized by, The tab welding quality detection device further comprises a probe (4), which is used to apply voltage to the tab (52) when the flat pressing part (3) flat presses the tab (52).
3. The tab weld quality detection apparatus according to claim 2, characterized by, The flat pressing part (3) comprises an upper pressing plate (31) and a lower pressing plate (32), the upper pressing plate (31) has a first plane (311) for contacting the tab (52), the lower pressing plate (32) has a second plane (321) for contacting the tab (52), the first plane (311) and the second plane (321) can respectively contact the upper and lower surfaces of the tab (52) and apply pressure to the tab (52).
4. The tab weld quality detection apparatus according to claim 3, characterized by, Along the first direction (X), the probe (4) and the thermal imaging part (2) are arranged on both sides of the flat pressing part (3), and the first direction (X) is the length direction or the width direction of the tab welding quality detection device.
5. The tab weld quality detection apparatus according to claim 4, characterized by, When the probe (4) contacts the tab (52), the projection of the thermal imaging part (2) on the battery cell (5) is located on the main body (51) of the battery cell (5); The thermal imaging part (2) can measure the temperature of the main body (51) to determine whether the tab (52) is short-circuited.
6. The tab weld quality detection apparatus according to claim 3, characterized by, The probe (4) is arranged on the upper pressing plate (31), and the end of the probe (4) for contacting the tab (52) protrudes from or is flush with the first plane (311).
7. The tab weld quality detection apparatus according to claim 6, characterized by, The upper pressing plate (31) is provided with a guide rail (312), and the probe (4) is slidingly connected with the guide rail (312).
8. The tab weld quality detection apparatus according to claim 3, characterized by, The tab welding quality detection device comprises a machine body (1), the machine body (1) comprises a mounting part (11), the mounting part (11) has a first sliding rail (111) extending along a second direction (Y), and the second direction (Y) is the height direction of the tab welding quality detection device; The upper pressing plate (31) has a first sliding groove matched with the first sliding rail (111), and the upper pressing plate (31) can slide relative to the mounting part (11) along the second direction (Y); and / or the lower pressing plate (32) has a second sliding groove matched with the first sliding rail (111), and the lower pressing plate (32) can slide relative to the mounting part (11) along the second direction (Y).
9. The tab weld quality detection apparatus according to claim 8, characterized by, The flat pressing part (3) further comprises a first driving part (33) arranged on the mounting part (11) and capable of driving the upper pressing plate (31) to slide along the second direction (Y); And / or, the flat pressing part (3) further comprises a second driving part (34) arranged on the mounting part (11) and capable of driving the lower pressing plate (32) to slide along the second direction (Y).
10. The tab weld quality detection apparatus of claim 8, wherein The machine body (1) further comprises a base (12) having a second sliding rail (121) extending along a first direction (X), the mounting part (11) has a sliding block (112) cooperating with the second sliding rail (121), and the mounting part (11) is capable of sliding relative to the base (12) along the first direction (X).