Ultrahigh-yield high-speed assembling method for lithium battery pole piece assembly

Abstract

The invention discloses an ultrahigh-yield high-speed assembly method for a lithium battery pole piece assembly, and the method is characterized in that an automatic process assembly line is a multi-branch confluence middle assembly output assembly line, and comprises two or more groups of assembly line input assembly ends, a confluence assembly table and a downstream output assembly line assembly end; one end of each assembly line input assembly end is a branch input end, the other end of each assembly line input assembly end is a branch output end, and all the branch output ends surround the confluence assembly table and are in butt joint with the confluence assembly table through a conveying belt or a mechanical arm. The method is novel in design, parts which are assembled at a high speed and prone to defective products serve as key nodes, the confluence assembly table is arranged, meanwhile, a sequential assembly automation assembly line thread is changed into two assembly line input assembly ends which are arranged in front, and then the two assembly line input assembly ends are assembled together on the confluence assembly table; the method is used for completing final assembly of parts where defective products are prone to occurring, and ultrahigh-yield high-speed assembly of the parts where the defective products are prone to occurring is achieved.

Description

Technical Field

[0001] The present invention relates to the field of automated high-speed assembly, and in particular to a high-speed assembly method for lithium battery pole piece components with ultra-high yield. Background Art

[0002] CN113537414B discloses a lithium battery defect detection method, including: obtaining a target pole piece image of a lithium battery to be detected; obtaining a first defect feature corresponding to the target pole piece image based on a first feature extraction algorithm; determining a first defect classification result corresponding to the first defect feature according to a first deep network; obtaining a second defect classification result corresponding to the target pole piece image based on a second feature extraction algorithm, wherein the second feature extraction algorithm is a second deep network; performing deduplication fusion processing on the first defect classification result and the second defect classification result to obtain a third defect classification result; screening the third defect classification result, and determining the target defect classification result as the defect detection result of the lithium battery to be detected. The invention can improve the accuracy of defect detection of lithium battery pole pieces. The method identifies defects of lithium battery pole pieces through traditional defect recognition methods and deep neural network methods, and performs deduplication, fusion and screening operations on the defect classification results identified by the two methods, thereby improving the accuracy of defect detection of lithium battery pole pieces and reducing the defective rate. The technology can effectively improve the production efficiency and quality of lithium batteries.

[0003] The utility model patent with patent number CN201621460020.8 discloses a blind hole detection fixture with threads on a mobile phone case. The detection fixture includes a product placement seat and an electric control box. The electric control box includes an electric control box body and an electric control box upper cover installed together. The product placement seat is arranged on the electric control box upper cover of the electric control box. A mold core that matches the shape of the product to be detected is fixedly arranged above the product placement seat. A probe is respectively installed on the upper cover of the electric control box at each position of the blind hole with threads on the product to be detected. An upper detection spring and a lower detection spring are fixedly installed on the top of the probe. The upper detection spring and the lower detection spring are insulated from each other. A control circuit is arranged in the electric control box body. The upper detection spring and the lower detection spring are respectively electrically connected to the control circuit. A through hole is opened at a corresponding position on the product placement seat. The probe is inserted into the through hole. Indicator lights are installed on the upper cover of the electric control box. The number of indicator lights is the same as the number of probes. The indicator lights are respectively electrically connected to the control circuit.

[0004] CN108172907B discloses a pole piece processing device, which relates to a high-speed die stacking machine; it includes a feeding mechanism for feeding pole pieces after die cutting; the feeding mechanism includes a chassis, a closed-loop track installed on the top of the chassis, a plurality of jigs for placing pole pieces arranged on the top of the track, and a power component for driving the track movement; the jig is provided with a plurality of pole piece placement positions. The invention has a high degree of automation and high work efficiency. The positive and negative pole piece die cutting mechanisms are arranged in parallel, and the space utilization rate is high. The track is in a closed loop shape to avoid damage to the pole piece, ensure the normal operation of the equipment, and further improve the stacking efficiency and stacking quality. The power component includes a driving motor, a mounting frame, a driving gear set and a driven gear set, which reduces production costs, takes up less space overall, and improves work efficiency and stacking quality. At the same time, it also includes a first fixed plate, a vertical slide installed on the side of the first fixed plate, a horizontal slide, a slider and a pressing claw and other components to ensure the stable operation of the stacking machine and improve the stacking efficiency and stacking quality.

[0005] CN209119252U discloses an automated assembly equipment for lithium-ion battery caps, including a frame, a detection mechanism, a welding mechanism, and a feeding device. The detection mechanism, the welding mechanism, and the feeding device are all arranged on the frame. A welding assembly is arranged on the periphery of the welding mechanism. A material shifting and changing plate assembly is arranged near the detection mechanism of the welding mechanism. An internal resistance test assembly, a height test assembly, and a discharging assembly are arranged on the periphery of the detection mechanism. The feeding device feeds the parts of the lithium-ion battery cap, the welding assembly assembles and welds the parts, the material shifting and changing plate assembly moves the welded lithium-ion battery cap to the detection mechanism, the internal resistance test assembly tests the internal resistance, the height test assembly tests the assembly height, and the lithium-ion battery cap that has been tested is removed from the discharging assembly. Through the structural arrangement of the feeding device, the welding assembly, the material shifting and changing plate assembly, the internal resistance test assembly, the height test assembly, and the discharging assembly, the assembly welding of the lithium-ion battery cap and the detection of the internal resistance height are realized, thereby improving production efficiency, avoiding the trouble of operating multiple devices, facilitating operation, and reducing production costs.

[0006] CN105280957B relates to a fully automatic production line for power lithium batteries and its production process. It is mainly composed of a pole piece production unit, a battery assembly unit, a battery injection unit and a factory processing unit. The electrical control system of the key equipment of each unit is composed of PLC, industrial computer, hydraulic and pneumatic components. The PLC control equipment coordinates the actions of various mechanisms, and the industrial computer collects data to realize the functions of storing and reading the data of the entire line. The main effects are reflected in: through the key debugging of production parameters, the mutual matching of the production efficiency of each unit is achieved, and the conveyor belt is used in the middle link, and finally the full automation of the production process is realized; the production line is compatible with the production requirements of multiple specifications of batteries, and the product change only needs to adjust the equipment parameters and replace some tooling fixtures to achieve production, meeting the order-based production requirements of the product; the key equipment and technical processes involved in the line are all independently developed, reliable and stable in operation, and have a high cost performance.

[0007] CN117059977A discloses a pole piece structure of a lithium battery, including a body, a protective layer 1 is fixedly sleeved on the outer wall of the body, a protective layer 2 is attached to the inner wall of the protective layer 1, a slot is provided on the outer wall of the body, a fixing strip is inserted into the inner wall of the slot, a support column is provided in the middle of the fixing strip, and a positive electrode and a negative electrode are provided on the inner walls of the two ends of the body respectively. Through the provided body, bottom plate, sleeve, telescopic rod, top cover, and negative electrode structure, during the assembly process of the lithium battery, the user can directly wrap the protective layer 2 around the outer wall of the body, and then fix the protective layer 2 by plugging the fixing strip and the slot, and the positive and negative electrode protection can directly pick up the top cover and align the fixing plate with the inner wall of the bottom plate, so that the fixing plate pushes the card plate to move, and then the card plate is sent into the inner wall of the card slot by the spring, so as to achieve the effect of rapid assembly of the lithium battery, improve assembly efficiency, and have the advantages of good heat dissipation effect, strong insulation, and high assembly efficiency. By providing the main body, bottom plate, sleeve, telescopic rod, top cover, and negative electrode structure, during the assembly of the lithium battery, the user can directly wrap the second protective layer around the outer wall of the main body, and then fix the second protective layer by plugging the fixing strip into the slot. The positive and negative electrode protection can be directly achieved by lifting the top cover and aligning the fixing plate with the inner wall of the bottom plate, so that the fixing plate pushes the card plate to move, and then the card plate is sent into the inner wall of the card slot by the spring, thereby achieving the effect of rapid assembly of the lithium battery and improving assembly efficiency. At the same time, by providing the air groove, exhaust pipe, storage groove, and heat insulation layer structure, during the operation of the lithium battery, the evaporating liquid will first contact the heat generated by the electrolyte when generating electricity, so that the evaporating liquid will have a vaporization effect, and after the air pressure increases, it will be discharged into the air groove through the exhaust pipe, thereby ensuring that the heat can be removed in time, ensuring that the lithium battery will not expand due to the heat, and improving the heat dissipation effect of the lithium battery. The above are all relatively close or related technologies in this field. In summary, the industry does not have a fully automatic high-speed assembly line for reference to solve the problem of defective assembly during high-speed assembly. Summary of the invention

[0008] The purpose of the present invention is to overcome the above problems existing in the prior art, and to provide a high-speed assembly method for lithium battery pole piece components with ultra-high yield in the field of fully automatic high-speed assembly lines. The present invention takes the high-speed assembly of parts that are prone to defective products as the key node, and sets a confluence assembly table to complete the final assembly of parts that are prone to defective products. At the same time, the sequential assembly automation line thread is changed to at least two line input assembly ends in front of the confluence assembly table, one of which is an automated assembly branch containing parts that are prone to defective products, and the other is an automated assembly branch that does not contain parts that are prone to defective products. Then the two are assembled together on the confluence assembly table to achieve ultra-high yield high-speed assembly of parts that are prone to defective products, that is, the number of defects in every million automated high-speed assemblies shall not exceed one.

[0009] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions: A high-speed assembly method for lithium battery pole piece components with ultra-high yield rate, including an automated process assembly line and an assembly method, characterized in that: the automated process assembly line is a multi-branch confluence assembly line, including a line input assembly end, a confluence assembly platform and a downstream confluence line assembly end, the number of the line input assembly ends is two or more, one end of each line input assembly end is a branch input end, and the other end is a branch output end, all the branch output ends surround the confluence assembly platform, and are connected to the confluence assembly platform through a conveyor belt or a manipulator, respectively, to provide semi-finished assembly components for the confluence assembly platform, and to perform splicing and assembly of the semi-finished assembly components, one end of the output line assembly end is connected to the confluence assembly platform through a conveyor belt or a manipulator, and the other end is connected to the assembly finished product storage place. The flow assembly method is a multi-branch confluence assembly output process, and the multi-branch confluence assembly output process includes multiple front-end branch assembly processes, a confluence assembly process and a downstream export assembly process.

[0010] Preferably, the assembly of the lithium battery pole piece assembly is divided into two or more simple assembly branches at the location where the risk of adverse reactions may occur during sequential assembly, and the conventional sequential assembly process of components is replaced by a sequential assembly process after branch confluence in combination with a confluence assembly station and subsequent sequential assembly branches.

[0011] Preferably, the sequentially assembled parts of the lithium battery pole piece assembly are the pole piece aluminum block, the pole piece upper plastic part, the pole column, the pole piece top cover plate, the sealing ring, the pole piece lower plastic part, and the busbar.

[0012] Preferably, the sealing ring is a flexible part, which is very easy to deform. When assembled after deformation, it is very easy to be damaged by the shear force of the outer ring assembly or to cause poor sealing due to distortion and deformation of the assembly. In the lithium battery pole piece assembly, the inner ring of the sealing ring covers the pole to achieve internal sealing, and the outer ring fits with the sink of the pole piece top cover to achieve external sealing. The second assembly of the sealing ring is the confluence assembly table, and the reverse assembly of the first side containing the sealing ring and the sequential assembly of the other side without the sealing ring are used as the assembly line input end. After the confluence assembly table realizes the internal and external seals of the sealing ring, parts continue to be added for assembly until the assembly task is completed at the downstream confluence assembly end.

[0013] Preferably, at the assembly end of the pipeline input that is assembled in reverse sequence on the first side containing the sealing ring, when the outer ring of the sealing ring is installed into the sinking platform of the pole piece top cover plate, the inner ring of the sealing ring is also inserted into the ejector pin supported by the pre-compression spring on the same side as the pole piece top cover plate, that is, the inner ring and outer ring of the sealing ring are completed in the same assembly step.

[0014] Preferably, the other side without the sealing ring is sequentially assembled into an assembly line input end to automatically assemble the pole, the bus bar, and the plastic part under the pole piece in sequence.

[0015] Preferably, the pole is to be assembled and sealed with the inner ring of the sealing ring of the ejector pin supported by the pre-compression spring, and the operation steps include: the pole is first contacted with the ejector pin supported by the pre-compression spring to form a concentric cylinder, and the pole then presses against the ejector pin supported by the pre-compression spring to compress the spring of the ejector pin supported by the pre-compression spring more, and the ejector pin retreats, and the sealing ring is blocked by the sink of the pole piece top cover plate and cannot retreat. As the concentric cylinder moves, the contact and fitting surface of the pole and the ejector pin passes over the inner ring of the sealing ring, and the inner ring of the sealing ring originally assembled on the surface of the ejector pin column is transferred to the column surface of the pole, thereby realizing lossless and gap-free replacement of the inner ring assembly.

[0016] Preferably, the downstream assembly line assembly end continues to automatically assemble the plastic parts and aluminum blocks on the pole pieces, thereby achieving high-speed assembly of lithium battery pole piece components with ultra-high yield.

[0017] The beneficial effects of the present invention are: 1. When assembling lithium battery pole piece components at high speed and automatically, the thinking is unique. The high-speed assembly of parts that are prone to defective products is taken as the key node, and a confluence assembly table is set up to complete the final assembly of parts that are prone to defective products. At the same time, the thread of the sequential assembly automation line is changed to at least two assembly line input terminals in front of the confluence assembly table, one of which is the automated assembly branch containing parts that are prone to defective products, and the other is the automated assembly branch without parts that are prone to defective products. Then the two are assembled together on the confluence assembly table, so that the weak links that are prone to defects are no longer weak.

[0018] 2. Achieve high-quality and high-speed assembly of parts that are prone to defective products. The number of defects shall not exceed one for every million automated high-speed assemblies, which greatly improves assembly efficiency, product quality, brand effect and economic benefits.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the pipeline technology architecture and process of the present invention; Figure 2 It is a schematic diagram of the explosion of parts of the lithium battery pole piece assembly involved in the present invention; Figure 3 This is a schematic diagram of the effect of the lithium battery pole piece assembly after assembly according to the present invention; Figure 4 It is a cross-sectional schematic diagram of the lithium battery pole piece assembly after assembly according to the present invention; Figure 5 Schematic diagram of the steps for assembling the key positions of the weak links of the present invention Figure 1 ; Figure 6 Schematic diagram of the steps for assembling the key positions of the weak links of the present invention Figure 2 ; Figure 7 Schematic diagram of the steps for assembling the key positions of the weak links of the present invention Figure 3 ; Figure 8 Schematic diagram of the steps for assembling the key positions of the weak links of the present invention Figure 4 ; Fig. 9 This is a flow chart of the fully automatic sealing ring loading steps of an embodiment of the present invention; Fig.10 This is a flow chart of the steps of fully automatic top cover sheet loading in one embodiment of the present invention; Fig.11 This is a flow chart of the steps of assembling a fully automatic sealing ring and a top cover sheet according to an embodiment of the present invention; Fig.12 It is a cross-sectional view of the assembly state of a fully automatic confluence assembly station according to an embodiment of the present invention.

[0021] Explanation of the numbers in the figure: pole piece aluminum block 1, pole piece upper plastic part 2, pole column 3, pole piece top cover plate 4, sealing ring 5, pole piece lower plastic part 6, bus bar 7, ejector pin 10, pre-load return spring 11, nozzle mounting seat 12, nozzle 13, lower plastic positioning block 14, assembly positioning fixture 15, positioning pin 16. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings: Reference Figures 1 to 12 As shown, the lithium battery pole piece assembly is assembled at a high speed with an ultra-high yield rate. The assembled parts of the lithium battery pole piece assembly are the pole piece aluminum block 1, the pole piece upper plastic part 2, the pole column 3, the pole piece top cover sheet 4, the sealing ring 5, the pole piece lower plastic part 6, and the busbar 7. After analysis and testing, the sealing ring 5 in this case is a flexible part, which is very easy to deform. After deformation, it is easy to be sheared by the shear force of the outer ring assembly or to cause poor sealing due to assembly distortion and deformation. In the lithium battery pole piece assembly, the inner ring of the sealing ring 5 should cover the pole column 3 to achieve internal sealing, and the outer ring and the pole piece top cover sheet 4 should be sealed. The sinking table is fitted to achieve external sealing. Since the sealing ring 5 is a weak link, one of the steps of assembling the two adjacent parts before and after the sealing ring 5 is set as a confluence assembly table, and the assembly at both ends of the sealing ring 5 is divided into two simple fully automatic assembly branches, that is, the second assembly of the sealing ring 5 is the confluence assembly table, and the reverse assembly of the first side containing the sealing ring 5 and the sequential assembly of the other side without the sealing ring 5 are the pipeline input assembly ends. After the confluence assembly table realizes the internal and external sealing assembly of the sealing ring 5, continue to add parts for assembly until the assembly task is completed. Specific embodiments The first side containing the sealing ring 5 is assembled in reverse order at the assembly line input end. When the outer ring of the sealing ring 5 is installed into the sink of the pole piece top cover sheet 4, the inner ring of the sealing ring 5 is also inserted into the ejector pin 10 supported by the pre-compression spring on the same side as the pole piece top cover sheet 4, that is, the inner ring and the outer ring of the sealing ring 5 are completed in the same assembly step. The other side without the sealing ring 5 is sequentially assembled as the assembly line input end to automatically assemble the pole piece aluminum block 1, the pole piece plastic part 2, and the pole 3 in sequence; the pole 3 is to realize the sealing replacement of the inner ring of the sealing ring 5 with the ejector pin 10 supported by the pre-compression spring, and the operation steps include: the pole 3 is first in contact with the ejector pin 10 supported by the pre-compression spring to form a concentric The pole 3 then presses against the ejector pin 10 supported by the pre-compression spring, so that the spring of the ejector pin 10 supported by the pre-compression spring is further compressed, the ejector pin retreats, and the sealing ring 5 is blocked by the sink of the pole piece top cover plate 4 and cannot retreat. With the movement of the concentric cylinder, the contact and fitting surface of the pole and the ejector pin passes over the inner ring of the sealing ring 5, and the inner ring of the sealing ring 5 originally assembled on the surface of the ejector cylinder is transferred to the cylinder surface of the pole 3, realizing the lossless and gap-free replacement of the inner ring assembly. Then, according to the sequential assembly process of the assembly end of the downstream confluence assembly line, the plastic part 2 on the pole piece and the pole piece aluminum block 1 are continuously assembled automatically, so as to realize the ultra-high yield and high-speed assembly of the lithium battery pole piece assembly.

[0024] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-speed assembly method for lithium battery pole piece components with ultra-high yield, including an automated process assembly line and a flow assembly method, characterized in that: The automated process assembly line is a multi-branch confluence assembly and export line, including an assembly line input assembly end, a confluence assembly platform and a downstream confluence assembly line end. The number of the assembly line input assembly ends is two or more. One end of each assembly line input assembly end is a branch input end, and the other end is a branch output end. All branch output ends surround the confluence assembly platform and are connected to the confluence assembly platform through a conveyor belt or a manipulator, respectively providing semi-finished assembly components for the confluence assembly platform, and performing splicing and assembly of the semi-finished assembly components. One end of the output assembly line end is connected to the confluence assembly platform through a conveyor belt or a manipulator, and the other end is connected to the assembly finished product storage area. The assembly method is a multi-branch confluence assembly output process, and the multi-branch confluence assembly output process includes multiple front-end branch assembly processes, a confluence assembly process and a downstream export assembly process.

2. A high-yield and high-speed assembly method for lithium battery pole piece components according to claim 1, characterized in that: The assembly of the lithium battery pole piece assembly is divided into two or more simple assembly branches at the position where the sequential assembly is prone to adverse risks, combined with the confluence assembly table and the subsequent sequential assembly branches, and the conventional component sequential assembly process is replaced by the sequential assembly process after branch confluence.

3. A high-yield and high-speed assembly method for lithium battery pole piece components according to claim 1, characterized in that: The sequentially assembled parts of the lithium battery pole piece assembly are a pole piece aluminum block (1), a pole piece upper plastic part (2), a pole column (3), a pole piece top cover plate (4), a sealing ring (5), a pole piece lower plastic part (6), and a busbar (7).

4. A high-yield and high-speed assembly method for lithium battery pole piece components according to claim 3, characterized in that: The sealing ring (5) is a flexible part and is very easy to deform. After deformation, it is easy to be damaged by the shear force of the outer ring during assembly or to cause poor sealing due to assembly distortion and deformation. In the lithium battery pole piece assembly, the inner ring of the sealing ring (5) covers the pole (3) to achieve internal sealing, and the outer ring fits with the sink of the pole piece top cover plate (4) to achieve external sealing. The second assembly of the sealing ring (5) is used as the confluence assembly table, and the reverse assembly of the first side containing the sealing ring (5) and the sequential assembly of the other side without the sealing ring (5) are used as the assembly line input end. After the confluence assembly table realizes the internal and external sealing assembly of the sealing ring (5), parts are continuously added for assembly until the assembly task is completed, which is the downstream confluence assembly end.

5. A high-speed assembly method for lithium battery pole piece components with ultra-high yield according to claim 4, characterized in that: At the assembly end of the pipeline input assembly of the first side of the sealing ring (5) assembled in reverse order, when the outer ring of the sealing ring (5) is installed into the sinking platform of the pole piece top cover plate (4), the inner ring of the sealing ring (5) is also inserted into the ejector pin (10) supported by the pre-compression spring on the same side as the pole piece top cover plate (4), that is, the inner ring and the outer ring of the sealing ring (5) are completed in the same assembly step.

6. A high-speed assembly method for lithium battery pole piece components with ultra-high yield according to claim 4, characterized in that: The other side without the sealing ring (5) is sequentially assembled into an assembly line input end to automatically assemble the pole (3), the busbar (7), and the plastic part (6) under the pole piece in sequence.

7. A high-speed assembly method for lithium battery pole piece components with ultra-high yield according to claims 5 and 6, characterized in that: The pole (3) is to be assembled and sealed with the inner ring of the sealing ring (5) of the ejector pin (10) supported by the pre-compression spring, and the operation steps include: the pole (3) first contacts the ejector pin (10) supported by the pre-compression spring to form a concentric column, and the pole (3) then presses against the ejector pin (10) supported by the pre-compression spring, so that the spring of the ejector pin (10) supported by the pre-compression spring is further compressed, the ejector pin retreats, and the sealing ring (5) is blocked by the sink of the pole top cover plate (4) and cannot retreat. As the concentric column moves, the contact and fitting surface of the pole and the ejector pin passes over the inner ring of the sealing ring (5), and the inner ring of the sealing ring (5) originally assembled on the surface of the ejector column is transferred to the surface of the pole (3) column, thereby realizing lossless and gapless replacement of the inner ring assembly.

8. A high-speed assembly method for lithium battery pole piece components with ultra-high yield according to claim 7, characterized in that: The downstream assembly line assembly end continues to automatically assemble the plastic parts (2) on the electrode and the electrode aluminum block (1), thereby achieving high-speed assembly of lithium battery electrode components with an ultra-high yield rate.

Images