Device for on-line detection of welding strength after welding of collector plate of full-tab cylindrical lithium battery

Abstract

The utility model relates to the technical field of lithium particle batteries, in particular to a device for on-line detection of welding strength after welding of a collector plate of a full-tab cylindrical lithium battery. The device comprises clamping detection mechanisms which are symmetrically arranged left and right, and is characterized in that the clamping detection mechanisms have the same structure; the device comprises a transfer platform, a guide rail arranged on the transfer platform, a tension spring elastic assembly installed on the guide rail in a sliding mode, a tension sensor unit connected with the tension spring elastic assembly and installed on the guide rail in a sliding mode, and a collector plate cover plate clamping unit connected with the tension sensor unit and installed on the guide rail in a sliding mode. And the aluminum shell positioning mechanism is arranged at the end part of the guide rail and is used for limiting the lithium battery. The on-line detection device has the beneficial effects that the working mode that the welding strength cannot be detected on line after the current collecting plate is welded in the past is changed, 100% on-line detection of the welding strength after the current collecting plate of the full-tab cylindrical lithium battery is welded is realized, and the yield in the product manufacturing process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium particle batteries, in particular to a device for on-line detection of welding strength after welding of a current collector plate of a full-tab cylindrical lithium battery. Background Art

[0002] As a high-energy density and environmentally friendly power solution, lithium batteries have been widely used in various electronic products and new energy vehicles. The tab is an important component responsible for conducting electricity and connection in a lithium battery. During the battery assembly process, the current collector plate is connected to the positive and negative electrodes of the battery through laser welding. However, problems such as poor welding and insufficient welding strength that may occur during the welding process can have a negative impact on the performance and safety of the lithium battery. The welding quality of the current collector plate and the tab of the wound core directly affects the charge and discharge efficiency and service life of the battery.

[0003] In the prior art, CN2022212881467, a tab welding strength detection device, its structure can only perform tests. After welding, it needs to be transferred for detection, which consumes a relatively long time and has low efficiency. Now, a production line is designed for unified production and welding. In order to cooperate with this production line and improve production efficiency.

[0004] Therefore, it is necessary to design a device for on-line detection of welding strength after welding of a current collector plate of a full-tab cylindrical lithium battery to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for on-line detection of welding strength after welding of a current collector plate of a full-tab cylindrical lithium battery to overcome the above-mentioned deficiencies existing in the current prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An on-line detection device for the welding strength of the current collector plate of a full-tab cylindrical lithium battery after welding, which includes clamping and detecting mechanisms symmetrically arranged on the left and right. It is characterized in that: the clamping and detecting mechanisms have the same structure, and each includes a transfer platform, a guide rail placed on the transfer platform, a spring tension component slidably mounted on the guide rail, a tensile sensor unit connected to the spring tension component and slidably mounted on the guide rail, a current collector plate cover clamping unit connected to the tensile sensor unit and slidably mounted on the guide rail, and an aluminum shell positioning mechanism provided at the end of the guide rail for limiting the lithium battery. The spring tension component includes a spring slider slidably mounted on the guide rail, a spring column mounted on the spring slider through a mounting block, a spring with one end mounted on the spring column through a connecting piece, a driving cylinder for driving the spring slider to move along the guide rail, and a limit nut for limiting the moving distance of the spring slider. The other end of the spring is connected to the tensile sensor unit, and the limit nut is mounted on the side of the spring slider.

[0008] Preferably, the spring tension component, the tensile sensor unit, and the current collector plate cover clamping unit are sequentially connected in series front and back and installed on the same line.

[0009] Preferably, the tensile sensor unit includes a tensile sensor slider slidably mounted on the guide rail, a rear end bolt with one end mounted on the side of the tensile sensor slider, a tensile sensor mounted on the other end of the rear end bolt, and a front end bolt for supporting the other end of the tensile sensor. The right end of the front end bolt is connected to the current collector plate cover clamping unit.

[0010] Preferably, the rear end bolt, the tensile sensor, and the front end bolt are all on the same horizontal plane.

[0011] Preferably, the current collector plate cover clamping unit includes a cover clamping mounting block slidably mounted on the guide rail, a clamping cylinder mounted on the cover clamping mounting block, and a profiling jaw clamped by the clamping cylinder. The front end bolt is connected to the cover clamping mounting block.

[0012] Preferably, the aluminum shell positioning mechanism includes a positioning mounting block fixed on the transfer platform and a positioning limit block provided on the positioning mounting block. A plurality of groups of fixing holes are provided on the positioning mounting block.

[0013] The beneficial effects of the present utility model are as follows: This technical solution changes the previous working mode in which the welding strength of the current collector plate cannot be inspected online after welding, realizes 100% online inspection of the welding strength of the current collector plate of the all-pole-ear cylindrical lithium battery after welding, and improves the yield rate during the product manufacturing process; through the action of the forward and backward cylinders in the device on the tension spring, the displacement of the tension spring forms a fixed-distance and fixed-direction tension force, which is used to detect the tension force of the welding points of the current collector plate of the all-pole-ear lithium battery after welding. The actual tension force data of the welding points of the current collector plate after welding is obtained through the tension sensor. According to the preset qualified standard, the test results are judged. If the tension force data meets the standard requirements, it is determined that the welding quality is qualified; if the tension force data is lower than the standard requirements, it is determined that the welding quality is unqualified. By setting the alarm value for continuous unqualified tension force, adjustments can be made to welding abnormalities in a timely manner, reducing the waste of materials caused by poor welding, saving material costs, and improving the actual yield rate of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of a device for online inspection of the welding strength of the current collector plate of an all-pole-ear cylindrical lithium battery after welding according to the present utility model;

[0015] Figure 2 It is a test schematic diagram of a device for online inspection of the welding strength of the current collector plate of an all-pole-ear cylindrical lithium battery after welding according to the present utility model;

[0016] In the figure: 1. Transfer platform; 2. Guide rail; 3. Tension spring elastic force assembly; 4. Tension sensor unit; 5. Current collector plate cover clamping unit; 6. Aluminum shell positioning mechanism; 31. Tension spring slider; 32. Tension spring column; 33. Connector; 34. Tension spring; 35. Driving cylinder; 36. Limit nut; 41. Tension sensor sliding block; 42. Rear end bolt; 43. Tension sensor; 44. Front end bolt; 51. Cover clamping mounting block; 52. Clamping cylinder; 53. Profiled clamping jaw; 61. Positioning mounting block; 62. Positioning limit block; 7. Lithium battery; 71. Current collector plate cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0019] Referring to Figures 1 to 2 , a device for on-line detection of the welding strength after welding of a current collector plate of a full-tab cylindrical lithium battery, which includes clamping and detecting mechanisms symmetrically arranged on the left and right. The clamping and detecting mechanisms have the same structure and both include a transfer platform 1, a guide rail 2 placed on the transfer platform, a spring tension component 3 slidably mounted on the guide rail, a tension sensor unit 4 connected to the spring tension component and slidably mounted on the guide rail, a current collector plate cover clamping unit 5 connected to the tension sensor unit and slidably mounted on the guide rail, and an aluminum shell positioning mechanism 6 provided at the end of the guide rail for limiting the lithium battery.

[0020] The spring tension component 3, the tension sensor unit 4, and the current collector plate cover clamping unit 5 are sequentially connected in series front and back and installed on the same line.

[0021] The spring tension component 3 includes a spring slider 31 slidably mounted on the guide rail, a spring column 32 mounted on the spring slider through a mounting block, a spring 34 with one end mounted on the spring column through a connecting piece 33, a driving cylinder 35 for driving the spring slider to move along the guide rail 2, and a limit nut 36 for limiting the moving distance of the spring slider. The other end of the spring 34 is connected to the tension sensor unit 4. The limit nut 36 is mounted on the side of the spring slider 31, that is, the side close to the driving cylinder 35. By adjusting the extended distance of the limit nut 36, the moving distance of the spring slider 31 can be controlled, and thus the stretching distance of the spring 34 can be controlled. After the spring slider 31 is driven, the end of the limit nut will abut against the end limit block of the driving cylinder to achieve the purpose of limiting. When the limit nut 36 extends longer, the moving distance becomes shorter, and the stretching distance of the spring becomes shorter. When the extended part of the limit nut is shorter, the moving distance becomes longer, and the stretching distance of the spring becomes longer. It can be adjusted in time according to the requirements of the detected product to adapt to different models for detection.

[0022] The tensile sensor unit 4 includes a tensile sensor slider 41 slidably mounted on the guide rail 2, a rear end bolt 42 with one end mounted on the side of the tensile sensor slider 41, a tensile sensor 43 mounted on the other end of the rear end bolt 42, and a front end bolt 44 used to abut against the other end of the tensile sensor 43. The right end of the front end bolt 44 is connected to the current collector cover clamping unit 5. To avoid affecting the detection effect, the rear end bolt 42, the tensile sensor 43, and the front end bolt 44 are all on the same horizontal plane;

[0023] The current collector cover clamping unit 5 includes a cover clamping mounting block 51 slidably mounted on the guide rail 2, a clamping cylinder 52 mounted on the cover clamping mounting block 51, and a profiling jaw 53 driven by the clamping cylinder for clamping. The front end bolt 44 is connected to the cover clamping mounting block 51. The cover clamping mounting block 51 is driven to move back and forth along the guide rail 2. After moving to the corresponding position, the clamping cylinder 52 drives the profiling jaw 53 to clamp the current collector cover;

[0024] The aluminum shell positioning mechanism 6 includes a positioning mounting block 61 fixed on the transfer platform 1 and a positioning limit block 62 provided on the positioning mounting block. A number of groups of fixing holes are provided on the positioning mounting block, and the positioning limit block is fixed by a fixing nut in cooperation with the fixing holes, and its position can be adjusted as needed to cooperate with different models of lithium batteries for installation. The aluminum shell of the lithium battery is clamped on the positioning limit block for fixation.

[0025] In this embodiment, it is symmetrically placed on both sides of the production line. When the lithium battery 7 is transported to this detection station by the production line, the L-shaped transfer platform 1 is moved to the working position by the transplanting cylinder or motor, and the cylindrical lithium battery 7 is clamped. The online welding strength of the positive and negative current collector covers 71 at both ends is detected. The positioning limit block 62 positions the outer shell of the lithium battery 7, and the driving cylinder 35 drives it to approach the lithium battery 7. The current collector cover is placed in the middle of the clamping part of the clamping cylinder 52. Then, according to the displacement distance to be measured, the distance of the limit screw is adjusted, and the clamping cylinder 52 is driven to clamp the current collector cover 72. After clamping, the driving cylinder 36 retreats away from the lithium battery 7, driving the tensile sensor 43, and at the same time driving the current collector cover to retreat backward, stretching the synchronous tension spring 34 to form a fixed-distance and fixed-direction tensile force, and transmitting this tensile force through the tensile sensor signal, so as to obtain specific data, and then comparing through the set parameters to determine whether the tensile test result is OK or NG; at the same time, the clamping cylinder is opened, and the driving cylinder and the L-shaped transfer platform 1 are reset to prepare for the next test.

[0026] The beneficial effects of the present utility model are as follows. This technical solution changes the working mode in which the welding strength of the current collector plate cannot be inspected online after welding in the past, realizes 100% online detection of the welding strength of the current collector plate of the all-pole-ear cylindrical lithium battery after welding, and improves the yield rate in the product manufacturing process. Through the action of the forward and backward cylinders in the device on the tension spring, the displacement of the tension spring forms a fixed-distance and fixed-direction tension force to detect the tension of the welding point of the all-pole-ear lithium battery current collector plate after welding. The actual tension data of the welding point of the current collector plate after welding is obtained through the tension sensor. According to the preset qualified standard, the detection result is judged. If the tension data meets the standard requirements, the welding quality is judged to be qualified; if the tension data is lower than the standard requirements, the welding quality is judged to be unqualified. By setting the alarm value for continuous unqualified tension, the welding abnormality is adjusted in time, reducing the material waste caused by poor welding, saving the material cost, and improving the actual yield rate of the production line.

[0027] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An on-line detection device for the welding strength after welding of a current collector plate of a fully tabular cylindrical lithium battery, which comprises clamping and detection mechanisms symmetrically arranged on the left and right, and is characterized in that: The clamping detection mechanisms have the same structure, and each includes a transfer platform, a guide rail placed on the transfer platform, a tension spring elastic force assembly slidably mounted on the guide rail, a tension sensor unit connected to the tension spring elastic force assembly and slidably mounted on the guide rail, a current collector cover plate clamping unit connected to the tension sensor unit and slidably mounted on the guide rail, and an aluminum shell positioning mechanism provided at the end of the guide rail for limiting the lithium battery. The tension spring elastic force assembly includes a tension spring slider slidably mounted on the guide rail, a tension spring column mounted on the tension spring slider through a mounting block, a tension spring with one end mounted on the tension spring column through a connecting piece, a driving cylinder for driving the tension spring slider to move along the guide rail, and a limit nut for limiting the moving distance of the tension spring slider. The other end of the tension spring is connected to the tension sensor unit, and the limit nut is mounted on the side of the tension spring slider.

2. The device for on-line detection of the welding strength after welding of the current collector plate of a full-tab cylindrical lithium battery according to claim 1, characterized in that: The tension spring elastic force assembly, the tension sensor unit, and the current collector cover plate clamping unit are connected in series front to back and installed on the same line.

3. An apparatus for on-line detection of the welding strength after welding of a current collector plate of a fully tabular cylindrical lithium battery according to claim 1, characterized in that: The tension sensor unit includes a tension sensor sliding block slidably mounted on the guide rail, a rear end bolt with one end mounted on the side of the tension sensor sliding block, a tension sensor mounted on the other end of the rear end bolt, and a front end bolt for abutting against the other end of the tension sensor. The right end of the front end bolt is connected to the current collector cover plate clamping unit.

4. An apparatus for on-line detection of the welding strength after welding of a current collector plate of an all-pole-ear cylindrical lithium battery according to claim 3, characterized in that: The rear end bolt, the tension sensor, and the front end bolt are all on the same horizontal plane.

5. An apparatus for on-line detection of the welding strength after welding of a current collector plate of a fully tabular cylindrical lithium battery according to claim 3, characterized in that: The current collector cover plate clamping unit includes a cover plate clamping mounting block slidably mounted on the guide rail, a clamping cylinder mounted on the cover plate clamping mounting block, and a profiling jaw clamped by the clamping cylinder. The front end bolt is connected to the cover plate clamping mounting block.

6. The device for on-line detection of welding strength after welding of the current collector plate of a fully tabular cylindrical lithium battery according to claim 1, characterized in that: The aluminum shell positioning mechanism includes a positioning mounting block fixed on the transfer platform and a positioning limit block provided on the positioning mounting block. A number of groups of fixing holes are provided on the positioning mounting block.

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