A re-inspection and screening device for products with poor sealing

Abstract

This application relates to a re-inspection and screening device for defective sealing products, comprising: a re-inspection product input belt for inputting re-inspection products initially marked as having welding defects; a re-inspection product handling mechanism, disposed between the output end of the re-inspection product input belt and the re-inspection preparation position of the re-inspection screening mechanism, for handling the re-inspection products from the output end of the re-inspection product input belt to the re-inspection preparation position; a re-inspection screening component, including a displacement module, the displacement module including a re-inspection preparation position, a re-inspection testing position, and a re-inspection discharge position arranged sequentially along its length, the re-inspection testing position being provided with a re-inspection mechanism; and a qualified product handling mechanism for handling re-inspection products that have been re-inspected and finally marked as qualified to the qualified product conveyor line. This embodiment allows products initially judged to have welding defects to flow back to the qualified product conveyor line in real time for continued production, eliminating the need for manual inspection and return to the production line, thus avoiding interruption of the production line or reduction of the conveying speed of the qualified product conveyor line, maintaining the continuous and normal operation of automated production.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a re-inspection and screening device for products with poor sealing. Background Technology

[0002] Lithium-ion batteries, due to their advantages such as high capacity density, high specific energy, and long cycle life, have become the preferred batteries for portable electronic products, electric vehicles, and energy storage, and are increasingly widely used. A lithium-ion battery mainly consists of the following parts: a cell formed by sequentially stacking positive electrode plates, a separator, and a negative electrode plate; a casing covering the cell; a battery cover plate on top of the casing; and positive and negative electrode posts welded to the mounting holes on the battery cover plate.

[0003] Furthermore, because lithium-ion batteries contain a large amount of chemical substances, a large amount of mixed gas is generated during charging and discharging, causing pressure to continuously accumulate inside the battery. If this pressure is not released in time, it can lead to an explosion. To prevent battery explosions, the pressure accumulated inside the battery needs to be released. The most common measure is to install a safety protection device on the battery top cover. Currently, the common safety protection device involves stamping a longitudinal through hole in the battery top cover and then welding an explosion-proof sheet.

[0004] However, due to defects such as pinholes, broken welds, and damaged explosion-proof valves that easily occur after welding the cover plate terminals and explosion-proof sheets, the battery cover cannot be completely sealed. This allows chemical substances inside the lithium-ion battery to leak through the damaged gaps, resulting in a high scrap rate and failure to meet usage requirements. Therefore, existing processes perform a sealing test on the battery cover to confirm whether it is completely sealed.

[0005] In the existing sealing inspection process, to improve efficiency, a set of testing fixtures will inspect multiple products simultaneously during the initial inspection. If one product is defective, the entire set will be judged as defective, resulting in an excessive number of defective products in a batch. Therefore, it is necessary to collect the products after the initial inspection and then inspect them separately. After inspection, the products that pass the sealing inspection are then transported back to the production line for further processing. This causes production line interruptions and affects the speed of automated production. Summary of the Invention

[0006] This application provides a re-inspection and screening device for products with poor sealing, in order to improve at least some of the above-mentioned problems.

[0007] The present invention is as follows: a re-inspection and screening device for products with poor sealing, comprising:

[0008] The re-inspection input belt is used to input re-inspection items that were initially marked as having welding defects;

[0009] The re-inspection sample handling mechanism is located between the output end of the re-inspection sample input belt and the re-inspection preparation position of the re-inspection screening mechanism, and is used to transport the re-inspection sample from the output end of the re-inspection sample input belt to the re-inspection preparation position;

[0010] The re-inspection and screening component includes a displacement module, which includes a re-inspection preparation position, a re-inspection test position and a re-inspection discharge position arranged sequentially along the length direction. The re-inspection test position is equipped with a re-inspection mechanism.

[0011] The qualified product handling mechanism is located above the re-inspection discharge position and is used to transport the re-inspected products that have been re-inspected by the re-inspection mechanism and finally marked as qualified to the qualified product conveyor line.

[0012] In one embodiment of the present invention, the re-inspection mechanism includes:

[0013] The lower mold is movably disposed in the displacement module, including a bearing surface for bearing the re-inspection product and carrying it to move along the length direction of the displacement module, and a second cavity is formed below the bearing surface;

[0014] The upper mold is vertically mounted above the re-inspection test position and is used to descend and cooperate with the lower mold to cover the re-inspection sample when the lower mold moves to the re-inspection test position. A first cavity communicating with the re-inspection sample is formed in the upper mold. The first cavity is configured to communicate with an external gas supply device to contain gas and cooperate in testing the sealing performance of the re-inspection sample.

[0015] In one embodiment of the present invention, the upper mold is provided with a first air passage connected to a gas supply device. The first air passage is connected to the lower end face of the upper mold and is respectively connected to the first sinks of the lower end face corresponding to the terminal post and the explosion-proof sheet of the battery cover plate through branch channels, for filling the first sinks with air.

[0016] The lower mold is provided with a second air passage that connects to the bearing surface of the lower mold and is connected to each of the second sinks on the bearing surface corresponding to the pole and the explosion-proof sheet through a branch channel; it also includes a detection component connected to the branch channel to detect changes in gas parameters within the branch channel.

[0017] In one embodiment of the present invention, the second air passage penetrates the lower surface of the lower mold; it also includes a vacuum lifting cylinder, the top end of which is provided with a countersunk hole, and the countersunk hole is connected to an external vacuuming device; the vacuum lifting cylinder is located below the lower mold and is configured to rise to abut against the lower surface of the lower mold when the re-inspection product is covered, and the countersunk hole is connected to the lower end of the second air passage.

[0018] In one embodiment of the present invention, the defective product re-inspection and screening device further includes:

[0019] The defective product handling mechanism is located above the re-inspection discharge position at one end and above the defective product recycling bin at the other end. It is used to transport the re-inspected products that have been re-inspected by the re-inspection mechanism and finally marked as defective to the defective product recycling bin.

[0020] The re-inspected products are moved to the re-inspection testing station and re-inspected by the re-inspection agency. The unqualified defective products are then transported by the defective product handling agency to the defective product recycling bin for rework and repair.

[0021] In one embodiment of the present invention, the defective product handling mechanism includes:

[0022] The transfer component is located at one end above the re-inspection discharge position and at the other end above one end of the transfer conveyor belt.

[0023] The transfer conveyor belt is located between the re-inspection discharge point and the defective product recycling bin;

[0024] The recycling component is positioned with one end above the other end of the transfer conveyor belt and the other end above the defective product recycling bin.

[0025] In one embodiment of the present invention, the re-inspection product handling mechanism and the qualified product handling mechanism are respectively: a fixed frame extending perpendicular to the length direction of the re-inspection screening component and arranged above the re-inspection screening component, and a vacuum suction cup slidably disposed on the fixed frame. The vacuum suction cup is configured to move downward to adsorb and carry the battery cover plate along the length direction of the fixed frame.

[0026] In one embodiment of the present invention, it further includes:

[0027] A flipping mechanism, located on the qualified product conveyor line, is used to flip the marked qualified products.

[0028] An electrical testing transfer mechanism is used to transfer flipped products into an electrical testing device to test their electrical performance.

[0029] The beneficial effects of this invention include:

[0030] In this embodiment, defective products can be accurately screened, and products initially judged to have welding defects can be returned to the qualified product conveyor line in real time, that is, returned to the production line to continue production. There is no need for manual inspection and removal from the production line, so there is no need to interrupt the production line or reduce the conveying speed of the qualified product conveyor line, thus avoiding affecting the flow of the production line and maintaining the continuous and normal operation of automated production. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, they can also obtain the necessary information based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a product re-inspection and screening device for poor sealing provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 The view from direction B is omitted after the electrical measurement transfer mechanism and the defective product handling mechanism are omitted.

[0034] Figure 3 for Figure 2 A cross-sectional view of the upper and lower molds working together at the re-inspection test position to test the sealing performance of the battery cover;

[0035] Figure 4 This is a schematic diagram of the battery cover.

[0036] In the diagram, 1 is the battery cover; 101 is the terminal post; and 102 is the explosion-proof plate.

[0037] 721. Input belt for re-inspected items;

[0038] 722. Inspection item handling mechanism;

[0039] 723. Re-inspection screening component; 7231. Displacement module; 7231a. Re-inspection material preparation position; 7231b. Re-inspection testing position; 7231c. Re-inspection material discharge position;

[0040] 7232, lower mold; 7232a, second cavity; 7232b, second air passage; 7232c, second recess;

[0041] 7233, Upper mold; 7233a, First cavity; 7233b, First air passage; 7233c, First sink groove;

[0042] A. Branch channel;

[0043] 7234, vacuum lifting cylinder; 7234a, countersunk hole;

[0044] 7235. Gas supply device;

[0045] 7236. Drive cylinder;

[0046] 724. Qualified goods handling mechanism;

[0047] 725. Qualified product conveyor line; 7251. Tilting mechanism;

[0048] 7261. Transfer components; 7262. Transfer conveyor belt; 7263. Recycling components;

[0049] 727. Defective product recycling bin;

[0050] 728. Electrical measurement transfer mechanism. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0055] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0056] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] Reference Figures 1-4 A device for re-inspecting and screening products with poor sealing is provided, comprising:

[0058] The re-inspection input belt 721 is used to input re-inspection items that were initially marked as having welding defects.

[0059] The re-inspection product handling mechanism 722 is located between the output end of the re-inspection product input belt 721 and the re-inspection material preparation position 7231a of the re-inspection screening mechanism, and is used to handle the re-inspection product from the output end of the re-inspection product input belt 721 to the re-inspection material preparation position 7231a.

[0060] The re-inspection and screening component 723 includes a displacement module 7231. The displacement module 7231 includes a re-inspection material preparation position 7231a, a re-inspection test position 7231b and a re-inspection material discharge position 7231c arranged sequentially along the length direction. The re-inspection test position 7231b is provided with a re-inspection mechanism.

[0061] The qualified product handling mechanism 724 is located above the re-inspection discharge position 7231c and is used to handle the re-inspected products that have been re-inspected by the re-inspection mechanism and finally marked as qualified to the qualified product conveyor line 725.

[0062] Specifically, the re-inspection product is the battery cover plate 1 that was initially marked as having poor welding. After the battery cover plate 1 is input into the re-inspection product input belt 721, the re-inspection product handling mechanism 722 transports the re-inspection product to the re-inspection preparation position 7231a of the re-inspection screening mechanism; the re-inspection product moves to the re-inspection testing position 7231b and is re-inspected by the re-inspection mechanism, and qualified products are screened out and finally marked as qualified; finally, the qualified product handling mechanism 724 transports the finally marked qualified re-inspection product to the qualified product conveyor line 725 for further processing.

[0063] Because the loading and unloading processes occupy a large operating space, only loading or unloading can be performed at any given time, and the two steps cannot be carried out simultaneously. This reduces the efficiency of the testing process and fails to meet the high-efficiency production requirements of the battery cover plate 1. Therefore, in this embodiment, the re-inspection preparation position 7231a and the re-inspection unloading position 7231c are located on both sides of the re-inspection testing position 7231b. That is, the loading of re-inspection products and the unloading of re-inspection products that are finally marked as qualified are located on opposite sides of the re-inspection testing position. The operations of loading re-inspection products and unloading re-inspection products that are finally marked as qualified will not affect each other or interfere with each other, and can even be carried out simultaneously. The loading and unloading actions can be carried out continuously, thereby ensuring high testing process efficiency and meeting the high-efficiency production requirements of the battery cover plate 1.

[0064] like Figure 3 Furthermore, the re-inspection agency includes:

[0065] The lower mold 7232 is movably disposed on the displacement module 7231, and includes a bearing surface for bearing the re-inspection product and carrying it to move along the length direction of the displacement module 7231. A second cavity 7232a is formed below the bearing surface.

[0066] The upper mold 7233 is vertically and flexibly disposed above the re-inspection test position 7231b. It is used to descend and cooperate with the lower mold 7232 to cover the re-inspection sample when the lower mold 7232 moves to the re-inspection test position 7231b. A first cavity 7233a communicating with the re-inspection sample is formed in the upper mold 7233. The first cavity 7233a is configured to communicate with an external gas supply device 7235 to contain gas and cooperate in testing the sealing performance of the re-inspection sample.

[0067] Specifically, the displacement module 7231 moves the lower mold 7232 below the upper mold 7233, reaching the re-inspection test position 7231b. The drive cylinder 7236 descends, driving the upper mold 7233 to descend and cooperate with the lower mold 7232 to cover the battery cover 1. The externally connected gas supply device 7235 supplies gas to the upper mold 7233. When there is a gap due to poor welding on the surface of the battery cover 1, the gas will flow from the first cavity 7233a on the upper surface of the battery cover 1 through the gap into the second cavity 7232a on the lower surface. By detecting the change in air parameters flowing into the second cavity 7232a, the sealing performance of the battery cover 1 and the leakage at the gap can be reflected.

[0068] After the inspection is completed, the drive cylinder 7236 drives the upper mold 7233 to rise, and the displacement module 7231 moves the lower mold 7232 to the re-inspection and discharge position 7231c, and the battery cover 1 can be removed.

[0069] In this embodiment, the gas supply device 7235, which is connected to the outside, is used to confirm whether the battery cover 1 is completely sealed. It can detect defective products such as pinholes, broken welds, and damaged explosion-proof valves, ensuring that the processed battery cover 1 is completely sealed and that the chemical substances inside the lithium-ion battery will not leak, thereby reducing the scrap rate and meeting the usage requirements.

[0070] The airtightness detection in this embodiment has high accuracy, greatly avoiding the problems of false detection and over-detection, and significantly reducing product quality risks.

[0071] like Figure 3 Furthermore, the upper mold 7233 is provided with a first air passage 7233b connected to the gas supply device 7235. The first air passage 7233b is connected to the lower end face of the upper mold 7233 and is connected to each of the first sinks 7233c provided on the lower end face of the terminal post 101 and explosion-proof sheet 102 corresponding to the battery cover plate 1 through branch channels A, for filling the first sinks 7233c with air.

[0072] The lower mold 7232 is provided with a second air passage 7232b, which is connected to the bearing surface of the lower mold 7232 and is connected to each of the second sinks 7232c provided on the bearing surface corresponding to the pole post 101 and the explosion-proof plate 102 through a branch channel A; it also includes a detection component connected to the branch channel A to detect changes in gas parameters in the branch channel A.

[0073] The first air passage 7233b, the wall of the first sink 7233c, and the upper surface of the battery cover 1 together form the first cavity 7233a; the second air passage 7232b, the sealing ring surrounding the wall of the second sink 7232c, and the lower surface of the battery cover 1 together form the second cavity 7232a. If the terminal post 101 and the explosion-proof sheet 102 of the battery cover 1 are well welded, they will completely isolate the upper and lower cavities.

[0074] To test the sealing performance, a tracer gas such as helium can be injected into the first chamber 7233a, and the second chamber 7232a is evacuated. Then, the helium and leakage rate are detected by a detection component such as a helium mass spectrometer. If helium is detected in a branch channel A of the second chamber 7232a or the leakage rate increases, it indicates that the electrode post 101 or the explosion-proof sheet 102 of the battery cover plate 1 is poorly welded, and helium leaks from the first chamber 7233a to the lower second chamber 7232a. The degree of welding damage can be judged with high precision and rapid accuracy based on the amount of helium detected per unit time. In addition, before using tracer gas for detection, a suitable amount of high-pressure gas of 0.25 MPa can be injected into the first cavity 7233a. Then, the gas pressure or gas leakage rate can be detected by the detection components such as gas pressure detectors installed in each branch channel A. If a pressure increase is detected in the branch channel A of the second cavity 7232a, or a pressure decrease is detected in the branch channel A of the first cavity 7233a, it indicates that the electrode post 101 or the explosion-proof sheet 102 of the battery cover plate 1 is poorly welded, and the gas leaks from the first cavity 7233a to the second cavity 7232a below. The degree of welding damage can be judged with high precision and rapid accuracy based on the gas pressure increment detected per unit time. Lithium batteries have strict requirements for the pressure resistance of the explosion-proof sheet 102. Therefore, injecting high-pressure gas also serves to test the pressure resistance of the explosion-proof sheet 102. If the pressure resistance is insufficient, the explosion-proof sheet 102 will rupture, causing a sudden and drastic change in pressure. The pre-injection of high-pressure gas can also perform a rough inspection of the welding. If poor welding is detected, it can be judged as a defective product and reworked directly without the need for the next step of fine helium testing, thus saving helium consumption.

[0075] In this embodiment, multiple first sinks 7233c are respectively set for each pole post 101 and explosion-proof sheet 102, forming a closed state at the positions of pole post 101 and explosion-proof sheet 102, reducing the probability of accidental gas leakage in the first cavity 7233a and avoiding obtaining unqualified test results erroneously; multiple second sinks 7232c are respectively set for each pole post 101 and explosion-proof sheet 102, forming a closed state below pole post 101 and explosion-proof sheet 102, and each sink is connected to the gas channel through a branch channel A. Each branch channel A can detect changes in gas parameters, thereby immediately determining which part of the battery cover 1 is poorly welded, which is beneficial for real-time location of the poor weld location, and can also save the step of finding the specific location of the poor weld after inspection, saving cost and time; from a production perspective, after inspection, the poorly welded parts can be quickly reworked and repaired, improving rework efficiency and overall productivity.

[0076] like Figure 2Furthermore, the gas supply device 7235 includes a tracer gas supply device. When testing for airtightness, the tracer gas supply device can inject a tracer gas, such as helium, into the first cavity 7233a. As an inert gas, helium will not damage the battery cover 1.

[0077] like Figures 2-3 Furthermore, the second air passage 7232b penetrates the lower surface of the lower mold 7232; it also includes a vacuum lifting cylinder 7234, the top of the vacuum lifting cylinder 7234 is provided with a countersunk hole 7234a, and the countersunk hole 7234a is connected to an external vacuuming device; the vacuum lifting cylinder 7234 is located below the lower mold 7232 and is configured to rise to abut against the lower surface of the lower mold 7232 when the re-inspection product is covered, and the countersunk hole 7234a is connected to the lower end of the second air passage 7232b.

[0078] Specifically, after the upper mold 7233 and lower mold 7232 are fitted together to cover the battery cover 1, the vacuum lifting cylinder 7234 is pushed out to abut against the lower surface of the lower mold 7232, and at the same time, the countersunk hole 7234a is connected to the lower end of the second air channel 7232b; the vacuum equipment is then activated to evacuate the second cavity 7232a. After helium is injected into the first cavity 7233a, the leakage of the gaps in the battery cover 1 can be determined with high precision and rapid accuracy using a helium gas spectrometer; or, after high-pressure gas is injected into the first cavity 7233a, the leakage of the gaps in the battery cover 1 can be determined with high precision and rapid accuracy using a gas pressure detector.

[0079] In this embodiment, the vacuum lifting cylinder 7234 can put the second chamber 7232a in a vacuum state, and the pressure difference between the first chamber 7233a and the second chamber 7232a will increase significantly. Under the driving action of this large pressure difference, if the welding is poor, even if the crack is very small, it can be quickly squeezed into the second chamber 7232a and detected. Therefore, compared with the prior art, it can achieve accurate detection of extremely small cracks and improve the detection sensitivity of welding cracks.

[0080] In this embodiment, the vacuum lifting cylinder 7234 has an ingenious design structure with a short upward stroke, enabling rapid docking with the second cavity 7232a and vacuuming, which improves the detection speed and is of great significance for accelerating production pace and efficiency. Moreover, the vacuum lifting cylinder 7234 is set independently of the lower mold 7232, so the overall design structure will not be complicated or the weight will increase due to the connection with the lower mold 7232, thus avoiding affecting the flexible translation of the lower mold 7232 and avoiding increased manufacturing costs. The independent setting also makes maintenance and replacement convenient.

[0081] After the inspection is completed, the actuation cylinder drives the upper mold 7233 to rise, the vacuum equipment is turned off, the vacuum lifting cylinder 7234 retracts, the displacement module 7231 moves the lower mold 7232 to the re-inspection discharge position 7231c, and the qualified product handling mechanism 724 transports the battery cover plate that has been re-inspected by the re-inspection mechanism and finally marked as qualified to the qualified product conveyor line 725.

[0082] like Figure 1 Furthermore, the re-inspection and screening device for defective sealing products also includes:

[0083] The defective product handling mechanism is located above the re-inspection discharge position 7231c at one end and above the defective product recycling box 727 at the other end. It is used to handle the re-inspected products that have been re-inspected by the re-inspection mechanism and finally marked as defective to the defective product recycling box 727.

[0084] The re-inspected items are moved to the re-inspection test station 7231b and re-inspected by the re-inspection agency. The unqualified defective items are then transported by the defective item handling agency to the defective item recycling box 727 for rework and repair.

[0085] like Figure 1 Furthermore, the defective product handling mechanism includes:

[0086] The transfer component 7261 is located above the re-inspection discharge position 7231c at one end and above one end of the transfer conveyor belt 7262 at the other end.

[0087] The transfer conveyor belt 7262 is located between the re-inspection discharge position 7231c and the defective product recycling box 727;

[0088] The recycling component 7263 is located above the other end of the transfer conveyor belt 7262 at one end and above the defective product recycling bin 727 at the other end.

[0089] The rejected defective products are transferred from the transfer component 7261 to the transfer conveyor belt 7262; then, the recycling component 7263 transports them to the defective product recycling bin 727 for rework and repair. The transfer component 7261 and the transfer conveyor belt 7262 serve as relay positioning, preventing the battery cover 1 at the re-inspection discharge point 7231c from being inaccurately positioned and thus avoiding difficulties in accurately placing the product into the defective product recycling bin 727, which would otherwise prevent the recycling operation from proceeding normally.

[0090] The transfer component 7261 and the recycling component 7263 are respectively: a fixed frame extending parallel to the length direction of the re-inspection and screening component 723 and a vacuum suction cup slidably mounted on the fixed frame. The vacuum suction cup is configured to move downwards to adsorb and carry the battery cover plate 1 along the length direction of the fixed frame. The re-inspection product handling mechanism 722 transports the battery cover plate 1 from the re-inspection discharge position 7231c to the transfer conveyor belt 7262 in one go; the recycling component 7263 removes the battery cover plate 1 in one go and then transports it to the defective product recycling box 727. By setting up the vacuum suction cup, the battery cover plate 1 can be quickly adsorbed. It is slidably mounted on the fixed frame and can slide along the fixed frame, which improves the handling speed and efficiency, and is of great significance for speeding up the production pace and improving production efficiency.

[0091] like Figures 1-2 Furthermore, the re-inspection product handling mechanism 722 and the qualified product handling mechanism 724 are respectively: a fixed frame extending perpendicular to the length direction of the re-inspection screening component 723 and arranged above the re-inspection screening component 723, and a vacuum suction cup slidably mounted on the fixed frame. The vacuum suction cup is configured to move downward to adsorb and carry the battery cover plate 1 along the length direction of the fixed frame. The re-inspection product handling mechanism 722 transports the battery cover plate 1 from the output end of the re-inspection product input belt 721 to the bearing surface of the upper mold 7233 at the re-inspection preparation position 7231a in one go; the qualified product handling mechanism 724 removes the battery cover plate 1 that has been re-inspected by the re-inspection mechanism and finally marked as qualified, and then transports it to the qualified product conveyor line 725. By setting up the vacuum suction cup, the battery cover plate 1 can be quickly adsorbed. It is slidably mounted on the fixed frame and can slide along the fixed frame, which improves the handling speed and efficiency, and is of great significance for accelerating the production rhythm and improving production efficiency.

[0092] like Figures 1-2 Furthermore, it also includes:

[0093] A flipping mechanism 7251 is provided on the qualified product conveyor line 725 and is used to flip the marked qualified products.

[0094] Electrical testing transfer mechanism 728 is used to transfer a flipped product into an electrical testing device to test its electrical performance.

[0095] Because the battery cover 1 is facing upwards during the sealing test, and the subsequent electrical performance test requires the battery cover 1 to be facing upwards, a flipping mechanism 7251 is used to flip the battery cover 1. The flipping mechanism 7251 includes a flipping disk installed on the qualified product conveyor line 725. The flipping disk has a slot along the radial direction and can rotate around an axis perpendicular to the conveying direction of the qualified product conveyor line 725. It is configured to engage the battery cover 1 from one side edge through the slot and flip the battery cover 1 to face upwards by rotation.

[0096] By setting a flipping mechanism 7251 to flip the battery cover 1 on the production line and using an electrical testing transfer mechanism 728 to quickly transfer it for electrical testing, it has a high flipping rate and fast handling speed, which is of great significance for speeding up the testing pace and improving production efficiency.

[0097] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A re-inspection screening device for defective products, comprising: a re-inspection product input belt for inputting re-inspection products marked as defective in initial inspection; a re-inspection product conveying mechanism arranged between the output end of the re-inspection product input belt and a re-inspection standby position of a re-inspection screening mechanism, for conveying the re-inspection products from the output end of the re-inspection product input belt to the re-inspection standby position; a re-inspection screening assembly comprising a displacement module, the displacement module comprising, in the length direction, a re-inspection standby position, a re-inspection test position and a re-inspection output position arranged in sequence, the re-inspection output position being on the side of the re-inspection test position opposite to the re-inspection standby position in the length direction of the displacement module, and the re-inspection test position being provided with a re-inspection mechanism; a qualified product conveying mechanism arranged above the re-inspection output position, for conveying the re-inspection products that have been re-inspected by the re-inspection mechanism and finally marked as qualified to a qualified product conveying line; the re-inspection product conveying mechanism and the qualified product conveying mechanism are parallel to each other, and the conveying movement directions of the two are perpendicular to the length direction of the displacement module, and the displacement module, the re-inspection product input belt and the qualified product conveying line are arranged adjacent to and side by side in the conveying movement direction; the re-inspection mechanism comprises: a lower die movably arranged in the displacement module, comprising a bearing surface for bearing the re-inspection products and carrying them to move in the length direction of the displacement module, and a second cavity being formed below the bearing surface; and an upper die arranged above the displacement module and capable of being lifted and lowered, for being lowered and cooperating with the lower die to cover the re-inspection products when the lower die moves to the re-inspection test position; the upper die is provided with a first gas passage connected with a gas supply device, the first gas passage is communicated to the lower end surface of the upper die and is communicated to each first sink groove corresponding to the pole and the explosion-proof sheet of the re-inspection products through branch passages respectively, and the first gas passage, the groove wall of the first sink groove and the upper surface of the re-inspection products together form a first cavity filled with gas; the lower die is provided with a second gas passage communicated to the bearing surface of the lower die, and each second sink groove corresponding to the pole and the explosion-proof sheet on the bearing surface is communicated through a branch passage respectively, and the second gas passage, the groove wall of the second sink groove and the lower surface of the re-inspection products together form a second cavity; and a plurality of detection components are connected with each branch passage respectively to detect the change of gas parameters in each branch passage, so as to locate and find the defective welding position on the surface of the re-inspection products in real time.

2. The re-inspection screening device for defective products according to claim 1, wherein: the second gas passage penetrates the lower surface of the lower die; and a vacuum lifting cylinder is further arranged below the lower die, the top end of the vacuum lifting cylinder is provided with a counterbore, and the counterbore is communicated to an external vacuum equipment; and the vacuum lifting cylinder is arranged below the lower die and is configured to be lifted to abut against the lower surface of the lower die when the re-inspection products are covered and the counterbore is communicated to the lower end of the second gas passage.

3. The re-inspection screening device for defective products according to claim 1, further comprising: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The defective product conveying mechanism is arranged above the re-inspection outlet and above the defective product recycling box, and is used to convey the re-inspected product marked as defective to the defective product recycling box; The re-inspected product is moved to the re-inspection test position and re-inspected by the re-inspection mechanism. The unqualified defective product screened out is conveyed to the defective product recycling box by the defective product conveying mechanism for repair.

4. The sealed defective product re-inspection screening device according to claim 3, characterized in that: The defective product conveying mechanism comprises: The transfer assembly is arranged above the re-inspection outlet and above one end of the transfer conveying belt; The transfer conveying belt is arranged between the re-inspection outlet and the defective product recycling box; The recycling assembly is arranged above the other end of the transfer conveying belt and above the defective product recycling box.

5. The sealed defective product re-inspection screening device according to claim 1, characterized in that: The re-inspected product conveying mechanism and the qualified product conveying mechanism are respectively a fixed frame arranged above the re-inspection screening assembly in the length direction of the re-inspection screening assembly and a vacuum suction cup slidably arranged in the fixed frame, and the vacuum suction cup is configured to move downward to adsorb and carry the re-inspected product to move along the length direction of the fixed frame.

6. The sealed defective product re-inspection screening device according to claim 1, characterized in that: Further comprising: The turnover mechanism is arranged on the qualified product conveying line and is used to implement turnover of the product marked as qualified; The electrical test transfer mechanism is used to transfer the turned-over product to the electrical test device for testing electrical performance.

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