Lithium battery lamination deviation rectifying structure

Abstract

The lithium battery lamination deviation rectifying structure comprises an equipment frame body and a plurality of groups of carrying mechanisms, bearing mechanisms, detecting mechanisms and deviation rectifying mechanisms which are arranged on the equipment frame body, the carrying mechanism is used for obtaining and carrying materials to the bearing mechanism, the bearing mechanism comprises a bearing plate, the bearing plate is hollow to form a bearing cavity, a plurality of suction holes communicated with the bearing cavity are formed in the bearing plate, and the suction holes are used for adsorbing the materials; a light source is arranged on one side of the bearing plate, the detection mechanism is arranged on the side, away from the light source, of the bearing plate and used for detecting the position deviation value of materials, and the deviation correction mechanisms are connected with the bearing mechanisms in a one-to-one correspondence mode. Multi-station simultaneous deviation correction can be achieved, the deviation correction efficiency is improved, the equipment productivity is improved, whole-process adsorption transposition is achieved, the detection mechanism detects on the side, away from the light source, of the material, the influence of the light source on the detection structure is reduced, therefore, the detection data deviation is reduced, and the deviation correction positioning precision is improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a lithium battery stack correction structure. Background Art

[0002] The structure of the automatic lithium battery cutting and stacking machine is a hot composite cutting and stacking machine developed for the core making process of power and energy storage lithium-ion batteries, and adopts a hot composite technology route. The biggest feature of hot composite technology is that it can achieve complete slicing and stacking of the positive electrode, negative electrode and separator at one time, effectively improving the quality and production rate of the stacking and battery cells; during the production process of the composite stacking, there is no reciprocating movement of the stacking table. The negative electrode sheet and the two layers of separator have been heated and composited into a unit before entering the stacking table, and there is no separator tail roll after the stacking is completed, avoiding the problems of internal wrinkles of the separator and separator wrinkles at the tail roll during the stacking process. The separator moves at a uniform speed throughout the stacking process, avoiding the alternation of separator tension. The visual inspection of the hot composite sheet is more accurate, with close to zero misjudgment; and the composite process makes the positive and negative electrode sheets and separators fit better, and the interface retention effect is better.

[0003] With the widespread use of lithium-ion batteries, production efficiency and safety requirements are increasing. During battery production, the accuracy of the stacking process is paramount to ensuring battery safety. During the lithium-ion battery stacking process, the accuracy of the stacking process is paramount. The position of the electrodes is typically adjusted using a correction mechanism. This mechanism utilizes an XXY correction platform combined with a CCD inspection camera to ensure OH alignment during the stacking process.

[0004] Existing correction structures are limited by structural space and usually use frontal light sources for lighting and photographing detection. They are easily affected by factors such as light source angle, contrast, light spot shadow, etc., resulting in large deviations in detection data. Coupled with the errors in the correction structure itself, it is difficult to ensure the correction positioning accuracy, resulting in poor battery cell alignment and low quality. Utility Model Content

[0005] The present application provides a lithium battery stack correction structure for reducing detection data deviation and improving correction positioning accuracy.

[0006] According to the present application, an embodiment provides a lithium battery stack correction structure for adjusting materials to a set position, comprising an equipment frame and multiple groups of conveying mechanisms, bearing mechanisms, detection mechanisms, and correction mechanisms provided on the equipment frame;

[0007] The transport mechanism is used to obtain and transport materials to the carrying mechanism. Multiple groups of the carrying mechanisms are arranged side by side, including a carrying plate, the carrying plate is hollow to form a carrying cavity, and the carrying plate is provided with a plurality of suction holes connected to the carrying cavity. The suction holes are used to absorb materials, and the number of the carrying mechanisms is not less than the number of the transport mechanisms;

[0008] A light source is provided on one side of the carrying plate, the detection mechanism is provided on the side of the carrying plate away from the light source, the detection mechanism is used to detect the position deviation value of the material, and the correction mechanism is connected to the carrying mechanism in a one-to-one correspondence.

[0009] In another embodiment, the transport mechanism includes a transport plate, which is hollow to form a transport cavity. A plurality of suction nozzles connected to the transport cavity are provided on the transport plate, and the suction nozzles are used to absorb or press the material.

[0010] In another embodiment, a driving mechanism is provided on the equipment frame, and a buffer bracket is provided on the side of the conveying plate away from the suction nozzle. The buffer bracket is used to connect the conveying plate and the driving mechanism, and multiple conveying plates are conveyed simultaneously by the driving mechanism.

[0011] In another embodiment, a buffer layer is provided on one side of the transport plate, and the buffer layer is provided on the same side as the suction nozzle.

[0012] In another embodiment, the detection mechanism includes an industrial camera, which is arranged close to one side of the supporting plate, and the industrial camera and the light source are arranged on the same straight line, and the supporting plate is arranged to be light-transmissive.

[0013] In another embodiment, light-transmitting plates are provided at both ends of the transport plate, and the light source, light-transmitting plate and industrial camera are arranged along the same straight line.

[0014] In another embodiment, a marking hole is provided on the light-transmitting plate.

[0015] In another embodiment, the side of the carrying plate used for carrying materials is smooth.

[0016] In another embodiment, the number of the supporting plates is a multiple of the number of the transport plates.

[0017] In another embodiment, the correction mechanism includes a correction platform and a correction bracket. The correction bracket is arranged on the correction platform, and the correction bracket is used to support and connect the supporting plate on a side away from the correction platform.

[0018] According to the lithium battery stacking correction structure of the above embodiment, the conveying plate obtains the electrode material and transports it to the supporting plate. The supporting plate turns on the negative pressure to make the material complete the position exchange between the conveying plate and the supporting plate. When the conveying plate is pressed down, the deviation value of the material position relative to the set position is detected by the detection mechanism. After the conveying plate is removed, the correction mechanism adjusts the position of the supporting plate according to the deviation value to correct the material, thereby realizing correction at any position within the correction range; at the same time, multiple groups of supporting mechanisms can realize correction at multiple stations at the same time, reducing the time required for correction and improving equipment production capacity. It can be applied to ultra-high-speed stacking equipment, and the whole process of adsorption and replacement is carried out. The detection mechanism detects on the side of the material away from the light source, reducing the influence of the light source on the detection structure, thereby reducing the deviation of the detection data and improving the correction positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall schematic diagram of the lithium battery stack correction structure;

[0020] Figure 2 This is a structural diagram of a carrying mechanism in an embodiment;

[0021] Figure 3 A side view of a supporting mechanism in another embodiment;

[0022] Figure 4 It is a structural schematic diagram of a transport mechanism in another embodiment;

[0023] Figure 5 A schematic structural diagram of a bearing mechanism and a deviation-correcting mechanism in another embodiment;

[0024] Figure 6 Schematic diagram of the correction drive in another embodiment.

[0025] Figure numerals: 1. Transport mechanism; 11. Transport plate; 12. Suction nozzle; 13. Buffer bracket; 14. Buffer layer; 15. Light-transmitting plate; 2. Carrying mechanism; 21. Carrying plate; 22. Suction hole; 3. Detection mechanism; 31. Light source; 32. Industrial camera; 33. Marking hole; 4. Correction mechanism; 41. Correction platform; 411. Lower table; 412. Correction drive; 413. Upper table; 42. Correction bracket; 5. Equipment frame. DETAILED DESCRIPTION

[0026] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0027] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various implementations, and the operational steps involved in each embodiment may be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a particular embodiment and do not imply a required composition and / or sequence.

[0028] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0029] Nowadays, with the widespread application of lithium batteries, the production efficiency and safety performance requirements of the batteries themselves are gradually increasing. In the battery production process, the accuracy of the stacking process has become the top priority for battery safety. During the stacking process of lithium batteries, the position of the pole pieces is generally adjusted by a correction structure. The principle is to use the XXY correction platform in combination with the CCD detection camera to ensure the OH alignment of the battery cells during the stacking process. However, the existing correction structure is limited by the structural space and usually uses a front light source for lighting and photo detection. It is easily affected by factors such as the light source angle, contrast, light spot shadow, etc., resulting in large deviations in the detection data. Coupled with the errors of the correction structure itself, it is difficult to ensure the accuracy of the correction positioning, resulting in poor cell alignment and low quality.

[0030] The present application provides a lithium battery stacking correction structure, which improves the overall structural rigidity and correction accuracy through a visual detection correction algorithm and a correction mechanism 4, ensures the final alignment of the battery cells of the stacking equipment, reduces the detection data deviation, and improves the correction positioning accuracy.

[0031] For this application, please refer to Figure 1In one embodiment, a lithium battery stack correction structure is provided, which is used to adjust the material to a set position, including an equipment frame 5 and multiple groups of conveying mechanisms 1, supporting mechanisms 2, detection mechanisms 3 and correcting mechanisms 4 arranged on the equipment frame 5; the conveying mechanism 1 is used to obtain and convey the material to the supporting mechanism 2, and multiple groups of supporting mechanisms 2 are arranged side by side, including a supporting plate 21, the supporting plate 21 is hollow to form a supporting cavity, and the supporting plate 21 is provided with multiple suction holes 22 connected to the supporting cavity, the suction holes 22 are used to absorb the material, and the number of the supporting mechanisms 2 is not less than the number of the conveying mechanisms 1; a light source 31 is provided on one side of the supporting plate 21, and the detection mechanism 3 is provided on the side of the supporting plate 21 away from the light source 31, the detection mechanism 3 is used to detect the position deviation value of the material, and the correcting mechanism 4 is connected to the supporting mechanism 2 in a one-to-one correspondence, and is used to correct the material according to the position deviation value.

[0032] For further information, please refer to Figure 1 The transport mechanism 1 includes a transport plate 11, which is hollow to form a transport cavity. The transport plate 11 is provided with a plurality of suction nozzles 12 connected to the transport cavity. The suction nozzles 12 are used to absorb or press materials. In the embodiment of the present application, an air pipe connected to the transport cavity is provided on the outside of the transport plate 11, and an air pipe connected to the bearing cavity is also provided on the outside of the carrying plate 21. One end of the air pipe is connected to the transport cavity and the carrying cavity respectively, and the other end is used to connect to an air pump and an external air source, so as to form positive and negative pressures in the transport cavity and the transport cavity, thereby sucking or pressing materials through the suction nozzles 12 and the suction cavity.

[0033] Furthermore, a driving mechanism is provided on the equipment frame 5, and a buffer bracket 13 is provided on the side of the conveying plate 11 away from the suction nozzle 12. The buffer bracket 13 is used to connect the conveying plate 11 and the driving mechanism, and multiple conveying plates 11 are conveyed simultaneously by the driving mechanism; in this embodiment, the driving mechanism is generally set as a multi-degree-of-freedom robotic arm, which cooperates with the conveying mechanism 1 to convey the material that has completed the previous process to the loading position of the next process within the XY space range.

[0034] In this embodiment, the conveying plate 11 turns on the negative pressure to absorb the material at the unloading position of the previous process through the suction nozzle 12, the driving mechanism transports the material to the top of the correction plate, and drives it down through the Z axis to place the material on the supporting plate 21. The supporting plate 21 turns on the negative pressure at the same time, absorbs the material through the suction nozzle 12, and the conveying plate 11 switches to positive pressure, so that the material completes the position exchange between the conveying plate 11 and the supporting plate 21. When the conveying plate 11 is pressed down, the detection mechanism 3 detects the deviation value of the material position relative to the set position; after removing the conveying plate 11, the correction mechanism 4 adjusts the position of the supporting plate 21 according to the deviation value to correct the material, and realizes correction at any position within the correction range; at the same time, multiple groups of supporting mechanisms 2 are arranged side by side to realize correction of multiple stations at the same time, reduce the time required for correction, and improve equipment production capacity. It can be applied to ultra-high-speed stacking equipment, and adsorbs and replaces throughout the process. The detection mechanism 3 detects on the side of the material away from the light source 31, reducing the influence of the light source 31 on the detection structure, thereby reducing the detection data deviation and improving the correction positioning accuracy.

[0035] For further information, please refer to Figure 1 In this embodiment, the transport plate 11 is designed as a suction cup with positive and negative pressure, which is convenient for quickly sucking out the hollow and not easy to leak the hollow; the supporting plate 21 is used to support the material. The surface of one side is flat and smooth. The specific supporting plate 21 is made of a whole plate with holes punched to form positive and negative pressure to protect the material during the correction process.

[0036] In this embodiment, in order to improve the correction efficiency, the number of the carrying plates 21 is a multiple of the number of the transport plates 11, which is convenient for the utilization rate of the carrying plates 21 and the transport plates 11. For details, please refer to Figure 1 There are 8 carrying plates 21 and they are evenly distributed side by side. There are 4 transport plates 11 and they are evenly distributed side by side. Multi-station correction, the number and size of the carrying plates 21 can be set according to the site, and it can be compatible with large-size pole piece correction.

[0037] Furthermore, in order to improve the stability and positioning accuracy of the electrode during transportation, please refer to Figure 1 A buffer layer 14 is provided on the lower end surface of the conveying plate 11. The buffer layer 14 is arranged on the same side as the suction nozzle 12 and is staggered with the position of the suction nozzle 12. During the conveying process, the buffer layer 14 contacts the material to reduce the vibration and rigid contact of the material during the conveying process and protect the material. Specifically, the buffer layer 14 is made of foam.

[0038] For further information, please refer to Figure 1The detection mechanism 3 includes an industrial camera 32. The carrier plate 21 is light-transmissive, and light-transmissive plates 15 are installed at both ends of the transport plate 11. The light source 31, light-transmissive plates 15, and industrial camera 32 are arranged along the same straight line. The industrial camera 32 is positioned near one side of the carrier plate 21 to capture the side position of the material, thereby capturing the actual position of the material. Marking holes 33 are provided on the light-transmissive plates 15. Marking holes 33 serve as a reference for detecting the material's position. When the transport plate 11 absorbs the material, the edges of the material at both ends contact the light-transmissive plates 15. Each light-transmissive plate 15 is provided with two marking holes 33, one corresponding to the corner of the material.

[0039] In this embodiment, two groups of industrial cameras 32 are provided corresponding to any material and are respectively arranged at both ends of the material. The light-transmitting plate 15 is a glass plate. The industrial camera 32 is arranged above the supporting plate 21 through the matching equipment frame 5, and the light source 31 is arranged below the supporting plate 21. The light source 31 can pass through the translucent supporting plate 21 and the light-transmitting plate 15 to capture the specific image of the light-transmitting plate 15 and the edge of the material; the correction structure of this application adopts a numerical control system to control the shooting and correction, and the controller is connected to the control detection mechanism 3 and the correction mechanism 4. The image taken by the industrial camera 32 is based on the visual detection correction algorithm, with the position of the marking hole 33 on the light-transmitting plate 15 as the reference, to calculate the deviation value of the material from the set position, and feed it back to the correction mechanism 4 for correction. The correction accuracy is high and the response speed is fast, which improves the overall structural rigidity and correction accuracy, and ensures the final alignment of the battery cells of the stacking equipment.

[0040] For further information, please refer to Figure 1 The correcting mechanism 4 includes a correcting platform 41 and a correcting bracket 42. The correcting platform 41 adopts an XXY correcting structure, which generally includes a lower table 411 fixed on the equipment frame 5, a correcting drive 412 arranged on the lower table 411, and an upper table 413 arranged on the correcting drive 412, wherein the upper table 413 can realize rapid adjustment of displacement and angle under the action of the correcting drive 412; the lower end of the correcting bracket 42 is connected to the upper table 413, and the upper end of the correcting bracket 42 is used to support and connect the supporting plate 21, so that after obtaining the deviation value of the material at the set position, the material on the supporting plate 21 is adjusted and corrected accordingly.

[0041] For high-speed and high-capacity battery production lines, equipment capacity, and simplified mechanisms reduce costs, improve equipment maintainability, and even reduce the frequency of daily maintenance and repairs. At the same time, the mechanism is simplified simultaneously, which greatly reduces costs. This mechanism has high correction accuracy, fast response speed, and can operate in parallel at multiple stations, and can be applied to ultra-high-speed stacking equipment. In the embodiment of the present application, the correction structure adopts a visual detection correction algorithm, combined with an XXY correction structure, to improve the overall structural rigidity and correction accuracy, ensure the final alignment of the stacking equipment battery cells, and the structure occupies a small space. The multi-module side-by-side design can realize the simultaneous operation of multiple stations, reduce the time required for correction, and improve equipment production capacity.

[0042] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A lithium battery stack correction structure for adjusting materials to a set position, characterized in that: It comprises an equipment frame (5) and a plurality of groups of transport mechanisms (1), bearing mechanisms (2), detection mechanisms (3) and deviation correction mechanisms (4) arranged on the equipment frame (5); The transport mechanism (1) is used to obtain and transport materials to the carrying mechanism (2), and multiple groups of the carrying mechanisms (2) are arranged side by side, including a carrying plate (21), the carrying plate (21) is hollow to form a carrying cavity, and the carrying plate (21) is provided with a plurality of suction holes (22) connected to the carrying cavity, and the suction holes (22) are used to absorb materials, and the number of the carrying mechanisms (2) is not less than the number of the transport mechanisms (1); A light source (31) is provided on one side of the carrier plate (21), the detection mechanism (3) is provided on a side of the carrier plate (21) away from the light source (31), the detection mechanism (3) is used to detect the position deviation value of the material, and the deviation correction mechanism (4) is connected to the carrier mechanism (2) in a one-to-one correspondence.

2. The lithium battery stack correction structure according to claim 1, wherein: The transport mechanism (1) comprises a transport plate (11), the transport plate (11) is hollow to form a transport cavity, and a plurality of suction nozzles (12) in communication with the transport cavity are provided on the transport plate (11), and the suction nozzles (12) are used to absorb or press materials.

3. The lithium battery stack correction structure according to claim 2, wherein: A driving mechanism is provided on the equipment frame (5); a buffer bracket (13) is provided on the side of the transport plate (11) facing away from the suction nozzle (12); the buffer bracket (13) is used to connect the transport plate (11) and the driving mechanism; and a plurality of transport plates (11) are transported simultaneously by the driving mechanism.

4. The lithium battery stack correction structure according to claim 2, wherein: A buffer layer (14) is provided on one side of the transport plate (11), and the buffer layer (14) is provided on the same side as the suction nozzle (12).

5. The lithium battery stack correction structure according to any one of claims 2 to 4, characterized in that: The detection mechanism (3) includes an industrial camera (32), the industrial camera (32) is arranged close to one side of the supporting plate (21), and the industrial camera (32) and the light source (31) are arranged on the same straight line, and the supporting plate (21) is arranged to be light-transmissive.

6. The lithium battery stack correction structure according to claim 5, characterized in that: Translucent plates (15) are provided at both ends of the transport plate (11), and the light source (31), the translucent plate (15) and the industrial camera (32) are arranged along the same straight line.

7. The lithium battery stack correction structure according to claim 6, characterized in that: A marking hole (33) is provided on the light-transmitting plate (15).

8. The lithium battery stack correction structure according to claim 2, wherein: The supporting plate (21) is used for supporting materials and has a smooth side.

9. The lithium battery stack correction structure according to claim 2, wherein: The number of the bearing plates (21) is a multiple of the number of the transport plates (11).

10. The lithium battery stack correction structure according to claim 1, wherein: The deflection correction mechanism (4) comprises a deflection correction platform (41) and a deflection correction bracket (42). The deflection correction bracket (42) is arranged on the deflection correction platform (41), and the side of the deflection correction bracket (42) facing away from the deflection correction platform (41) is used to support and connect the supporting plate (21).

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