A method for stress analysis and defect location marking in non-visual assembly process of batteries

Abstract

A method for stress analysis and defect position marking of a non-visual assembly process of a battery of the present invention belongs to the technical field of battery production, and the method comprises the following steps: starting a servo motor to push a battery cell into a shell at a uniform speed through a slide rail; a sensor collects real-time pressure data of a non-visual fully automatic high-speed assembly process and transmits it to a central control computer; the central control computer summarizes and counts the collected pressure data through a production information management system; the central control computer converts the data into a statistical graph through a data analysis tool, and performs denoising and smoothing processing, and generates a standard pressure curve through a database; according to the waveform difference between the actual pressure curve and the standard pressure curve, corresponding to the assembly position of the battery cell and the shell, the failure modes such as scratches, wrinkles, accumulation, and impact generated during the non-visual fully automatic high-speed assembly of the battery cell and the shell are analyzed and controlled.

Description

Technical Field

[0001] The present invention discloses a method for stress analysis and defect position marking in a non-visual assembly process of a battery, belonging to the technical field of battery production. Background Art

[0002] A battery refers to a cup, trough or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate an electric current. It is a device that can convert chemical energy into electrical energy. As the core of mobile electronic products and electric vehicles, batteries play a vital role in promoting the process of human society to get rid of fossil fuels. As one of the key structures of a battery, the battery cell includes a positive electrode sheet, a negative electrode sheet, a diaphragm, a structural part, etc., and is called the "heart" of the battery. The shell, as the battery cell, uses a 0.2-1mm metal material. The positive and negative electrodes serve as carriers and current collectors for the conductive crystals in the battery, usually composed of 6-8μm copper foil and 10-15μm aluminum foil. The diaphragm can pass conductive ions and prevent electrons from passing through. It is usually composed of 10-15μm polyethylene or polypropylene. It plays a decisive role in the final performance of the battery.

[0003] The pole core and the shell are in a closed environment and assembled non-visually and fully automatically at high speed. The pole core is an assembly part with a complex surface structure and low strength. The shell is a cup, trough, tube, cylinder or other container or a composite container, and there are tiny burrs on the cut end surface.

[0004] During this process, the battery cells may suffer from scratches, wrinkles, and accumulation, and the battery cells may collide with the casing, which cannot be tracked through visual inspection. Summary of the invention

[0005] In order to solve the problems existing in the prior art that during the battery cell assembly process, battery cells may be scratched, wrinkled, piled up, and the battery cells collide with the shell, which cannot be tracked through visual inspection, we proposed a method for stress analysis and defect position marking of non-visual battery assembly process.

[0006] A method for stress analysis and defect position marking in a non-visual assembly process of a battery according to the present invention is characterized in that the method comprises the following steps:

[0007] Step S1: starting the servo motor (1) to push the battery cell (2) into the housing (4) at a constant speed through the slide rail (3);

[0008] Step S2: the sensor (5) transmits the real-time pressure data collected during the non-visual fully automatic high-speed assembly process to the central control computer (6);

[0009] Step S3: The central control computer (6) summarizes and counts the collected pressure data through the production information management system;

[0010] Step S4: The central control computer (6) converts the data into a statistical graph through a data analysis tool, performs denoising and smoothing processing, and generates a standard pressure curve through a database;

[0011] Step S5: According to the waveform difference between the actual pressure curve and the standard pressure curve, corresponding to the assembly position of the battery cell (2) and the shell (4), the failure modes such as scratches, wrinkles, accumulation, and impact generated during the non-visual fully automatic high-speed assembly process of the battery cell (2) and the shell (4) are analyzed and controlled.

[0012] Furthermore, in the step S1, a slide rail (3) is provided on the right side of the servo motor (1), and a battery cell (2) and a housing (4) are provided on the slide rail (3) in sequence from left to right.

[0013] Furthermore, the battery cell (2) is a rectangular parallelepiped or a cylinder, and is a plane-symmetrical structure as a whole, and its outer wall comprises a rectangular convex structure (7), a circular concave structure (8), a circular convex structure a (9), a "Z"-shaped convex structure (10), a circular convex structure b (11) and an oblong convex structure (12).

[0014] Furthermore, the shell (4) is a cup, a trough, a tube, a cylinder or other container or a composite container.

[0015] Furthermore, in step S2, the sensor (5) is located on the right side of the servo motor (1), and is used to collect real-time pressure data of the assembly process, supports input of different types of pressure sensors, and can collect pressure fluctuation data at a fixed frequency and transmit it to the central control computer (6) via a data transmission line.

[0016] Furthermore, a dust cover (13) is provided above the slide rail (3).

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention uses a sensor with a fixed frequency to collect real-time pressure data of a non-visual fully automatic high-speed assembly process, connects a data transmission line, and transmits the pressure data to a central control computer, which records the pressure value through a production information management system; a data analysis tool converts the data into a statistical chart, and performs denoising and smoothing processing; and a standard pressure curve is generated through a database.

[0019] 2. The present invention visualizes the non-visualized fully automatic high-speed assembly process according to the waveform and coordinates of the curve. By analyzing the waveform difference between the actual pressure curve and the standard pressure curve, the corresponding assembly positions of the battery cell and the aluminum shell are identified, and the failure modes such as scratches, wrinkles, accumulation, and impact generated during the assembly process of the battery cell and the shell are marked.

[0020] 3. The present invention visualizes the automated production line processing process through statistical graphics, monitors and adjusts the data at each stage, and achieves the purpose of improving and ensuring quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the non-visual assembly process of the present invention, which also serves as a summary figure.

[0022] Figure 2 It is a schematic front view of a battery cell (2) in the present invention.

[0023] Figure 3 It is a left side schematic diagram of a battery cell (2) in the present invention.

[0024] Figure 4 It is a schematic front view of the housing (4) of the present invention.

[0025] Figure 5 It is a left side schematic diagram of the shell (4) in the present invention.

[0026] Figure 6 It is a left-side schematic diagram of the assembly working state of the battery cell (2) and the housing (4) in the present invention.

[0027] Figure 7 It is a schematic diagram of the pressure curve of the assembly process of the present invention.

[0028] Description of reference numerals:

[0029] 1. Servo motor, 2. Battery cell, 3. Slide rail, 4. Shell, 5. Sensor, 6. Central control computer, 7. Rectangular convex structure, 8. Circular concave structure, 9. Circular convex structure a, 10. "Zhong" shaped convex structure, 11. Circular convex structure b, 12. Oblong convex structure, 13. Dust cover, 14. Waveform 1, 15. Waveform 2, 16. Waveform 3, 17. Waveform 4, 18. Waveform 5, 19. Waveform 6, 20. Waveform 7, 21. Waveform 8, 22. Waveform 9, 23. Waveform 10, 24. Waveform 11, 25. Waveform 12, 26. Waveform 13, 27. Waveform 14, 28. Waveform 15, 29. Waveform 16, 30. Waveform 17. DETAILED DESCRIPTION

[0030] A specific implementation case of the present invention is given below in conjunction with the accompanying drawings to introduce the structure and implementation method of the present invention in detail. It should be noted that the scope of application of the present invention is not limited to the following embodiments, and all similar structures based on the present invention are within the scope of application of the present invention.

[0031] A method for stress analysis and defect position marking of a battery non-visual assembly process according to the present invention is as follows: Figure 1 As shown, the method comprises the following steps:

[0032] Step S1: starting the servo motor (1) to push the battery cell (2) into the housing (4) at a constant speed through the slide rail (3);

[0033] Step S2: the sensor (5) transmits the real-time pressure data collected during the non-visual fully automatic high-speed assembly process to the central control computer (6);

[0034] Step S3: The central control computer (6) summarizes and counts the collected pressure data through the production information management system;

[0035] Step S4: The central control computer (6) converts the data into a statistical graph through a data analysis tool, performs denoising and smoothing processing, and generates a standard pressure curve through a database;

[0036] Step S5: According to the waveform difference between the actual pressure curve and the standard pressure curve, corresponding to the assembly position of the battery cell (2) and the shell (4), the failure modes such as scratches, wrinkles, accumulation, and impact generated during the non-visual fully automatic high-speed assembly process of the battery cell (2) and the shell (4) are analyzed and controlled.

[0037] As a further introduction to this embodiment, in step S1, a slide rail (3) is provided on the right side of the servo motor (1), and battery cells (2) and a housing (4) are provided on the slide rail (3) from left to right. During the use of the battery assembly, the housing (4) serves to protect the battery cells.

[0038] As a further introduction to this embodiment, Figure 2 As shown, the battery cell (2) is a rectangular parallelepiped or cylindrical body, and is composed of a positive electrode sheet, a negative electrode sheet, a diaphragm, a structural member and other parts. The overall structure is plane-symmetrical, and its outer wall includes a rectangular convex structure (7), a circular concave structure (8), a circular convex structure a (9), a "Z"-shaped convex structure (10), a circular convex structure b (11) and an oblong convex structure (12).

[0039] As a further introduction to this embodiment, the shell (4) is a cup, a trough, a tube, a cylinder or other container or a composite container.

[0040] As a further introduction to this embodiment, in step S2, the sensor (5) is located on the right side of the servo motor (1), and is used to collect real-time pressure data of the assembly process, supports different types of pressure sensor input, and can collect pressure fluctuation data at a fixed frequency and transmit it to the central control computer (6) through a data transmission line.

[0041] As a further introduction to this embodiment, a dust cover (13) is provided above the slide rail (3).

[0042] The present invention provides a non-visual full-automatic high-speed assembly process of a battery cell (2) and a housing (4) in a closed environment, including: a servo motor (1), a slide rail (3), a sensor (5), a central control computer (6), etc., to realize the assembly process of pushing the battery cell into the housing. Figure 1

[0043] Figure 7 The present invention provides an assembly process pressure curve as shown in

[0044]

[0045] Waveform 1 (14) is a pressure curve generated by the central control computer (6) through software by collecting the pushing resistance of the rectangular convex structure (7), circular concave structure (8), and circular convex structure a (9) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0046] Waveform 2 (15) is a pressure curve generated by the central control computer (6) through software by collecting the combined pushing resistance of the rectangular convex structure (7) and circular convex structure a (9) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0047] Waveform 3 (16) is a pressure curve generated by the central control computer (1) through software by collecting the single pushing resistance of the circular convex structure a (9) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0047] Waveform 4 (17) is a pressure curve generated by the central control computer (6) through software by collecting the single pushing resistance of the "middle" - shaped convex structure (10) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0048] Waveform 5 (18) is a pressure curve generated by the central control computer (1) through software by collecting the combined pushing resistance of the "middle" - shaped convex structure (10) and circular convex structure b (11) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0049] Waveform 6 (19) is a pressure curve generated by the central control computer (1) through software by collecting the single pushing resistance of the circular convex structure b (11) of the battery cell (2) at a fixed frequency by the sensor (5) during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0050] Waveform 7 (20) is the pressure curve generated by the central control computer (1) through software, which is the combined pushing resistance of the circular convex structure b (11) and the oblong convex structure (12) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0051] Waveform 8 (21) is the pressure curve generated by the central control computer (6) through software, which is the single pushing resistance of the oblong convex structure (12) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0052] Waveform 9 (22) is the pressure curve generated by the central control computer (6) through software, which is the combined pushing resistance of the circular convex structure a (9) and the oblong convex structure (12) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0053] Waveform 10 (23) is the pressure curve generated by the central control computer (6) through software, which is the single pushing resistance of the oblong convex structure (12) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0054] Waveform 11 (24) is the pressure curve generated by the central control computer (1) through software, which is the combined pushing resistance of the circular convex structure b (11) and the oblong convex structure (12) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0055] Waveform 12 (25) is the pressure curve generated by the central control computer (1) through software, which is the single pushing resistance of the circular convex structure b (11) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0056] Waveform 13 (26) is the pressure curve generated by the central control computer (1) through software, which is the combined pushing resistance of the "middle" - shaped convex structure (10) and the circular convex structure b (11) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0057] Waveform 14 (27) is the pressure curve generated by the central control computer (6) through software, which is the single pushing resistance of the "middle" - shaped convex structure (10) of the battery cell (2) collected by the sensor (5) at a fixed frequency during the process of pushing the battery cell (2) into the housing (4) by the servo motor (1).

[0058] Waveform 15 (28) is a pressure curve generated by the central control computer (1) through software when the battery cell (2) is pushed into the housing (4) by the servo motor (1), and the sensor (5) collects the single pushing resistance of the circular convex structure a (9) of the battery cell (2) at a fixed frequency.

[0059] Waveform 16 (29) is a pressure curve generated by the central control computer (6) through software when the battery cell (2) is pushed into the housing (4) by the servo motor (1), and the sensor (5) collects the pushing resistance of the combination of the rectangular convex structure (7) and the circular convex structure a (9) of the battery cell (2) at a fixed frequency.

[0060] Waveform 17 (30) is a pressure curve generated by the central control computer (6) through software when the battery cell (2) is pushed into the housing (4) by the servo motor (1), and the sensor (5) collects the pushing resistance of the rectangular convex structure (7), the circular concave structure (8), and the circular convex structure a (9) of the battery cell (2) at a fixed frequency.

[0061] In the present invention, since the battery cell (2) has a plane-symmetrical structure,

[0062] Waveform 10 (23) has a slightly greater slope than waveform 8 (21);

[0063] Waveform 11 (24) has a slightly greater slope than waveform 7 (20);

[0064] Waveform 12 (25) has a slightly greater slope than waveform 6 (19);

[0065] Waveform 13 (26) has a slightly greater slope than waveform 5 (18);

[0066] Waveform 14 (27) has a slightly greater slope than waveform 4 (17);

[0067] Waveform 15 (28) has a slightly greater slope than waveform 3 (16);

[0068] Waveform 16 (29) has a slightly greater slope than waveform 2 (15);

[0069] Waveform 17 (30) has a slightly greater slope than waveform 1 (14);

[0070] As the contact area between the battery cell (2) and the housing (4) increases, the number of geometric structures of the battery cell (2) in contact increases, the resistance increases slightly, and the slope increases slightly.

[0071] The working principle of the present invention is as follows:

[0072] When the battery cell (2) is pushed into the housing (4) at a uniform speed by the servo motor (1), the battery cell (2) has different structures and structural dimensions, and generates resistance due to friction with the housing (4). The sensor (5) collects data at a fixed frequency and transmits it to the central control computer (6) via a data transmission line. The central control computer (6) records the pressure value through the production information management system, converts the data into a statistical chart through a data analysis tool, and performs denoising and smoothing on a large number of curves to generate a standard pressure curve. Due to slight processing defects such as burrs and deformation on the cutting port of the housing (4), scratches, wrinkles, accumulation, impact and other defects are generated when the battery cell (2) is pushed into the housing (4), resulting in increased resistance, and the actual pressure curve waveform does not match the standard pressure curve waveform. The horizontal axis of the curve is time. The sensor (5) collects data at a fixed frequency, and the servo motor (1) pushes in at a constant speed. Therefore, the horizontal axis can be regarded as the contact position between the battery cell (2) and the shell (4), that is, the position where the defect occurs. The vertical axis is the resistance value, that is, whether there is a defect, which visualizes the non-visual fully automatic high-speed assembly process.

Claims

1. A method for stress analysis and defect position marking in a non-visual assembly process of a battery, characterized in that: The method comprises the following steps: Step S1: starting the servo motor (1) to push the battery cell (2) into the housing (4) at a constant speed through the slide rail (3); Step S2: the sensor (5) transmits the real-time pressure data collected during the non-visual fully automatic high-speed assembly process to the central control computer (6); Step S3: The central control computer (6) summarizes and counts the collected pressure data through the production information management system; Step S4: The central control computer (6) converts the data into a statistical graph through a data analysis tool, performs denoising and smoothing processing, and generates a standard pressure curve through a database; Step S5: According to the waveform difference between the actual pressure curve and the standard pressure curve, corresponding to the assembly position of the battery cell (2) and the shell (4), the failure modes such as scratches, wrinkles, accumulation, and impact generated during the non-visual fully automatic high-speed assembly process of the battery cell (2) and the shell (4) are analyzed and controlled.

2. According to claim 1, a method for stress analysis and defect position marking of a battery non-visual assembly process is characterized in that: In the step S1, a slide rail (3) is provided on the right side of the servo motor (1), and a battery cell (2) and a housing (4) are provided on the slide rail (3) in sequence from left to right.

3. A method for stress analysis and defect position marking in a non-visual assembly process of a battery according to claim 2, characterized in that: The battery cell (2) is a rectangular parallelepiped or cylindrical body, and is a plane-symmetrical structure as a whole. Its outer wall comprises a rectangular convex structure (7), a circular concave structure (8), a circular convex structure a (9), a "Z"-shaped convex structure (10), a circular convex structure b (11), and an oblong convex structure (12).

4. A method for stress analysis and defect position marking in a non-visual assembly process of a battery according to claim 3, characterized in that: The shell (4) is a cup, a trough, a tube, a cylinder or other container or a composite container.

5. A method for stress analysis and defect position marking in a non-visual assembly process of a battery according to claim 1, characterized in that: In step S2, the sensor (5) is located on the right side of the servo motor (1), and is used to collect real-time pressure data during the assembly process. It supports input of different types of pressure sensors and can collect pressure fluctuation data at a fixed frequency and transmit it to the central control computer (6) via a data transmission line.

6. A method for stress analysis and defect position marking in a non-visual assembly process of a battery according to claim 1, characterized in that: A dust cover (13) is provided above the slide rail (3).

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