Secondary battery preparation method and preparation device based on 3D printing technology

Abstract

The invention discloses a secondary battery preparation method and preparation device based on a 3D printing technology, and the preparation method comprises the steps: obtaining battery information which comprises at least one of a battery model, a battery size, a battery shape, a battery weight, a battery number and battery arrangement; a 3D printing model of a battery package is generated based on the battery information, the battery package at least comprises a bottom support part and a main body part, and at least one contact surface of the battery package and the battery is provided with an anti-sticking structure; printing the 3D printing model based on the battery package to form a bottom support part; placing at least one battery in the collet portion based on the battery information; and the main body part is printed on the bottom support part based on the 3D printing model of the battery package, so that the at least one battery is sealed in the battery package. The battery package is generated based on the 3D printing technology, the package can be customized for the battery, the capacity of rapid production and preparation is achieved, and the generated battery package is good in air tightness.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a method and a device for preparing a secondary battery based on 3D printing technology. Background Art

[0002] Traditional lithium battery packaging usually relies on mold manufacturing and requires customized packaging for batteries. However, the design of traditional molds is fixed and it is difficult to quickly adapt to the needs of different battery models or specifications. Each time the model is changed, new molds need to be remanufactured. Customizing packaging for new battery models requires a long cycle, and the packaging needs to be customized in batches. As the battery update speed accelerates, the mold development speed cannot keep up with the product update speed, and small batch orders may also encounter order rejection. In addition, traditional packaging materials need to be cut into specific shapes, generating a large amount of scraps, and mold production also requires additional materials. These materials often cannot be fully utilized during the production process, resulting in waste. At the same time, traditional packaging production methods usually require manual operations for multiple steps such as assembly, inspection, and packing. The production process flow is complex and prone to operational errors, increasing the production difficulty.

[0003] The sealing performance of battery packaging produced by mold manufacturing is often restricted by materials or manufacturing processes. For example, during battery charging and discharging or temperature changes, traditional packaging may not be able to be completely sealed, resulting in air, moisture, pollutants, etc. entering the interior of the packaging, affecting the performance and safety of the battery core. Poor packaging sealing performance may also lead to safety hazards such as battery leakage or explosion. Summary of the Invention

[0004] Based on this, in view of the problems in the above background art, it is necessary to provide a method and a device for preparing a secondary battery based on 3D printing technology, which can at least avoid the long cycle and difficulty in mold customization and achieve flexible and efficient production of battery packaging.

[0005] To achieve the above object and other related objects, one aspect of the present application provides a method for preparing a secondary battery based on 3D printing technology, including the following steps:

[0006] Obtain battery information, where the battery information includes at least one of battery model, battery size, battery shape, battery weight, battery quantity, and battery arrangement;

[0007] Generate a 3D printing model of the battery packaging based on the battery information. The battery packaging includes at least a bottom part and a main body part, and an anti-sticking structure is provided on at least one contact surface between the battery packaging and the battery;

[0008] Print the bottom part based on the 3D printing model of the battery packaging;

[0009] Place at least one battery in the base part based on battery information;

[0010] Print and form a main body part on the base part based on a 3D printing model of the battery package to seal at least one battery inside the battery package.

[0011] In one embodiment, the main body part includes an outer baffle part, an inner spacer part, and a top cover part;

[0012] Printing and forming a main body part on the base part based on a 3D printing model of the battery package includes:

[0013] Print outer structural material on the base part based on a 3D printing model of the battery package to form the outer baffle part;

[0014] Print inner structural material inside the outer baffle part based on a 3D printing model of the battery package to form the inner spacer part;

[0015] Print top structural material on the outer baffle part and the inner spacer part based on a 3D printing model of the battery package to form the top cover part. The top cover part includes a positive and negative electrode separator for separating the positive and negative electrodes of the battery;

[0016] Wherein, the outer structural material and the top structural material include rigid insulating materials, the inner structural material includes flexible materials, the outer structural material, the top structural material, and the bottom structural material for forming the base part include at least one of polycarbonate, polyether ether ketone, and polyetherimide, and the inner structural material includes at least one of flexible photosensitive resin and thermoplastic elastomer.

[0017] In one embodiment, before printing and forming a main body part on the base part based on a 3D printing model of the battery package, it further includes the step of printing and forming a sealing ring on the base part. The sealing ring is located between the base part and the main body part and is used for sealing and unsealing between the base part and the main body part;

[0018] Wherein, the sealing material for forming the sealing ring includes thermoplastic materials, and the sealing material can be heated and melted to unseal the base part and the main body part; wherein, the thermoplastic materials include at least one of polyurethane, polyethylene, and polyamide, and the melting temperature range of the thermoplastic materials is 60°C to 80°C.

[0019] In one embodiment, anti-sticking structures are provided on the surface of the base part in contact with the bottom surface of the battery and the surface of the main body part in contact with the side surface of the battery. The anti-sticking structures include a plurality of bumps, and the plurality of bumps are evenly distributed to form a bump array; or,

[0020] The bottom support part is provided with a groove for fixing the battery, and an anti-adhesion structure is arranged on the surface of the bottom support part in contact with the bottom surface of the battery. An anti-adhesion spacing is arranged between the side surface of the battery and the main body part.

[0021] In one embodiment, the method for preparing a secondary battery based on 3D printing technology further includes:

[0022] Scanning a label to obtain at least one of the battery model and the battery weight; and / or,

[0023] Scanning the battery to obtain at least one of the battery size and the battery shape.

[0024] In one embodiment, generating a 3D printing model of the battery package based on the battery information includes: generating a battery model based on the battery information, and generating a 3D printing model of the battery package based on the battery information and the battery model.

[0025] In one embodiment, placing at least one battery in the bottom support part based on the battery information includes: placing at least two batteries with the same battery model in the same bottom support part based on the battery information.

[0026] In one embodiment, the method for preparing a secondary battery based on 3D printing technology further includes: generating a radio frequency identification tag based on the battery information; placing the radio frequency identification tag at the tag installation location of the battery package.

[0027] In one embodiment, the method for preparing a secondary battery based on 3D printing technology further includes: obtaining the pressure information inside the battery package, and obtaining the airtightness information of the battery package based on the change of the pressure information; and / or, obtaining the temperature information and / or humidity information inside the battery package, and obtaining the safety status information of the battery based on the change of the temperature information and / or humidity information.

[0028] In one embodiment, the method for preparing a secondary battery based on 3D printing technology further includes: obtaining the safety status information, and sending an alarm signal when the safety status information is abnormal, and the alarm signal includes at least one of a sound signal, a light signal, and a text signal.

[0029] On the other hand, the present invention provides a device for preparing a secondary battery based on 3D printing technology, including:

[0030] An information acquisition device for acquiring battery information, where the battery information includes at least one of a battery model, a battery size, a battery shape, a battery weight, a battery quantity, and a battery arrangement;

[0031] A modeling device for generating a 3D printing model of the battery package based on the battery information, where the battery package at least includes a bottom support part and a main body part, and an anti-adhesion structure is arranged on at least one contact surface between the battery package and the battery;

[0032] A packaging printing device, configured to:

[0033] Print and form a bottom support part based on a 3D printing model of a battery package; and

[0034] Print and form a main body part on the bottom support part based on the 3D printing model of the battery package to seal at least one battery in the battery package;

[0035] An object transferring device, configured to place at least one battery in the bottom support part based on battery information.

[0036] In one embodiment, the packaging printing device is further configured to print and form a sealing ring on the bottom support part before printing and forming the main body part, where the sealing ring is located between the bottom support part and the main body part and is used for sealing and unsealing between the bottom support part and the main body part.

[0037] In one embodiment, the secondary battery preparation device based on 3D printing technology further includes:

[0038] A label device, configured to generate a radio frequency identification label based on battery information;

[0039] A sensor, configured to obtain pressure information inside the battery package and obtain airtightness information of the battery package based on changes in the pressure information; or, configured to obtain temperature information and / or humidity information inside the battery package and obtain safety status information of the battery based on changes in the temperature information and / or humidity information;

[0040] An alarm, configured to obtain safety status information and emit an alarm signal when the safety status information is abnormal, where the alarm signal includes at least one of a sound signal, a light signal, and a text signal;

[0041] A processor, to which the information acquisition device, the modeling device, the packaging printing device, and the packaging printing device are all connected.

[0042] According to the secondary battery preparation method and device based on 3D printing technology provided by the present invention, generating a battery package based on 3D printing technology can not only customize the package for the battery according to the size and shape of the battery, but also has the ability of rapid production and preparation, while avoiding waste of packaging materials. The generated battery package has good airtightness, avoiding moisture or other pollutants from entering the interior of the package, and improving the performance and safety of the battery. Description of the Drawings

[0043] To better describe and illustrate the embodiments and / or examples of those applications disclosed herein, one or more drawings may be referred to. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed applications, the currently described embodiments and / or examples, and the currently understood best mode of these applications.

[0044] Figure 1 It is a schematic diagram of a secondary battery preparation device based on 3D printing technology provided in an embodiment;

[0045] Figure 2 It is a schematic diagram of the structure of a battery package provided in an embodiment;

[0046] Figure 3 It is a flowchart of a secondary battery preparation method based on 3D printing technology provided in an embodiment;

[0047] Figure 4 It is a schematic diagram of a packaging printing device provided in an embodiment;

[0048] Figure 5 It is a schematic diagram of a perspective of a printing device provided in an embodiment;

[0049] Figure 6 It is a schematic diagram of another perspective of a printing device provided in an embodiment;

[0050] Figure 7 It is a block diagram of a 3D modeling system provided in an embodiment;

[0051] Figure 8 It is a block diagram of a projection guidance system provided in an embodiment.

[0052] Explanation of reference numerals:

[0053] 100, Secondary battery preparation device based on 3D printing technology; 110, Information acquisition device; 120, Modeling device; 130, Packaging printing device; 140, Object transfer device; 150, Processor; 160, Labeling device; 170, Sensor; 180, Alarm;

[0054] 200, Battery package; 210, Bottom support part; 220, Outer baffle part; 230, Inner partition part; 240, Top cover part; 250, Sealing ring;

[0055] 510, 3D modeling system; 520, projection guidance system; 530, spraying system; 511, camera module; 512, modeling module; 513, attitude calibration module; 521, image generation module; 522, projection module; 523, fine-tuning module; 524, tracking compensation module; 531, spraying component; 532, moving module; 533, control module; 5311, nozzle; 5312, spraying drive mechanism; 5321, guide rod; 5322, first horizontal drive mechanism; 5323, second horizontal drive mechanism; 5324, vertical drive mechanism; 540, frame; 543, printing platform; 550, heating module; 560, curing module; 570, loading device; 600, battery. Detailed implementation manners

[0056] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0058] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of this application. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of the described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0059] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present application. Although only the components related to the present application are shown in the illustrations and are not drawn according to the number, shape and size of the components in actual implementation, the types, quantities and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0060] In view of the problem that the mold manufacturing cannot meet the packaging requirements of the battery, the present invention provides a secondary battery preparation device 100 based on 3D printing technology, as Figure 1 shown, which includes an information acquisition device 110, a modeling device 120, a packaging printing device 130, a material transfer device 140, a processor 150, as well as a labeling device 160, a sensor 170, and an alarm 180.

[0061] In one embodiment, the information acquisition device 110 is used to acquire battery information, where the battery information includes but is not limited to at least one of battery model, battery size, battery shape, battery weight, battery quantity, and battery arrangement. Optionally, the information acquisition device 110 includes but is not limited to a scanning device, and the scanning device can acquire at least one of the battery signal and battery weight by scanning the label, or can directly scan the battery itself to acquire at least one of the battery size and battery shape. Optionally, the information acquisition device 110 can also include an input device, and the input device includes but is not limited to a keyboard, a mouse, a scanner, a handwriting input board, a voice input device, etc., and acquires battery information based on the interaction between the user and the input device. The information acquisition device 110 is connected to the processor 150, and after acquiring the battery information, the information acquisition device 110 transmits the battery information to the processor 150.

[0062] In one embodiment, the modeling device 120 includes a three-dimensional (3D) modeling device. The modeling device 120 is connected to the processor 150, acquires battery information from the processor 150, and then generates a 3D printing model of the battery packaging based on the battery information. Specifically, the modeling device 120 first generates a 3D model of the battery according to the acquired battery information such as battery model, battery shape, and battery size, and then generates a 3D printing model of the battery packaging according to the 3D model of the battery and battery information such as battery quantity and battery arrangement. After generating the 3D printing model of the battery packaging, the modeling device 120 transmits the 3D printing model of the battery packaging to the processor 150 or the packaging printing device 130.

[0063] In one embodiment, the packaging printing device 130 acquires the 3D printing model of the battery packaging from the processor 150 or the modeling device 120 and performs printing based on the 3D printing model of the battery packaging. Among them, the battery packaging 200 at least includes a bottom support part 210 and a main body part. In addition, an anti-sticking structure is provided on at least one contact surface between the battery packaging 200 and the battery. First, the packaging printing device 130 prints to form the bottom support part 210. Specifically, the packaging printing device 130 prints the bottom structure material to form the bottom support part 210. The bottom structure material generally uses a hard insulating material, such as at least one of polycarbonate, polyetheretherketone, and polyetherimide. Optionally, polyetheretherketone (PEEK) is used as the bottom structure material, which can not only improve the rigidity of the bottom support part 210 but also improve the heat resistance. Refer toFigure 2 As shown, the bottom support part 210 includes one or more grooves for placing the battery, and the size of the groove is greater than or equal to the size of the battery. By making the size of the groove larger than the size of the battery, it is ensured that the battery can be placed in the groove. For example, the size of the groove can be 2 mm to 5 mm larger than the size of the battery, so that the battery can be placed in the groove and the battery can be prevented from shaking or colliding in a groove with too large a size. By making the size of the battery equal to the size of the groove, the battery can be stuck in the groove to prevent the battery from shaking in the groove. In addition, an anti-sticking structure can be provided on the surface of the bottom support part 210 in contact with the bottom surface of the battery. The anti-sticking structure includes, but is not limited to, bumps. The size range of the bumps includes 0.3 mm to 0.5 mm. A honeycomb or grid dot matrix-like bump array can be formed by arranging a plurality of evenly distributed bumps as the anti-sticking structure. When the packaging printing device 130 prints to form the bottom support part 210, the anti-sticking structure can be printed at the same time without additional printing steps.

[0064] In one embodiment, referring to Figure 2 and Figure 4 As shown, after the bottom support part 210 is printed and formed, instead of directly printing other parts of the battery packaging on the bottom support part 210, the battery is first placed in the bottom support part 210. The object transfer device 140 is used to place the battery in the bottom support part 210. The object transfer device 140 includes, but is not limited to, mechanical devices such as a manipulator that can transfer an object from an initial position to a target position. It should be noted that since different models of batteries cannot be placed in the same battery packaging, the object transfer device 140 is connected to the processor 150 to obtain battery information such as battery signals and battery weights. The object transfer device 140 places two or more batteries of the same model in the same bottom support part 210 based on the battery information.

[0065] In one embodiment, referring to Figure 2 As shown, the packaging printing device 130 is also used to print a sealing ring 250 on the bottom support part 210. The sealing ring 250 is used for sealing and unsealing between the bottom support part 210 and the main body part. Specifically, after the battery is placed in the bottom support part 210, the packaging printing device 130 switches to print the sealing material to form the sealing ring 250. The sealing material usually uses a thermoplastic material, such as at least one of polyurethane, polyethylene, and polyamide. Optionally, polyurethane (TPU) is used as the sealing material. It not only has good sealing performance and chemical stability and can be used to achieve the sealing between the bottom support part 210 and the main body part, but also the sealing material can melt at 60°C to 80°C and has high mechanical properties and anti-aging ability, and can be used to achieve the unsealing between the bottom support part 210 and the main body part. For example, it can be unsealed by heating the sealed part with infrared rays.

[0066] In one embodiment, referring toFigure 2 and Figure 4 As shown, the packaging and printing device 130 is also used to print the main body part on the bottom support part 210. Further, the main body part includes an outer baffle part 220, an inner spacer part 230, and a top cover part 240. After printing and forming the sealing ring 250, the packaging and printing device 130 switches to printing the outer baffle part 220 with an outer structural material. The outer structural material generally uses a hard insulating material, such as at least one of polycarbonate, polyetheretherketone, and polyetherimide. Optionally, using polycarbonate as the outer structural material not only has good electrical insulation but also has high impact resistance, and can provide good protection for the battery. In addition, polycarbonate has a relatively high melting point and can withstand the temperature fluctuations generated by the battery cell during use. In addition, an anti-sticking structure can be provided on the inner surface of the outer baffle part 220 in contact with the side of the battery. The anti-sticking structure can be formed by the bumps as described above, or after the battery is stuck in the groove of the bottom support part 210, the anti-sticking can be achieved by setting an anti-sticking spacing between the outer baffle part 220 and the side wall of the battery.

[0067] In one embodiment, referring to Figure 2 and Figure 4 As shown, the packaging and printing device 130 is also used to print the inner spacer part 230 inside the outer baffle part 220. After printing and forming the outer baffle part 220, the packaging and printing device 130 switches to printing the inner spacer part 230 with an inner structural material. The inner structural material generally uses a flexible material, such as at least one of flexible photosensitive resin and thermoplastic elastomer. Optionally, using flexible photosensitive resin as the inner structural material has good elasticity and buffering performance, can effectively absorb external impacts, and also has good anti-wear, anti-aging, and chemical resistance. In addition, an anti-sticking structure can be provided on the surface of the inner spacer part 230 in contact with the side of the battery, which will not be elaborated here.

[0068] In one embodiment, referring to Figure 2As shown, the packaging and printing device 130 is also used to print the top cover portion 240 on the outer baffle portion 220 and the inner spacer portion 230. After printing to form the inner spacer portion 230, the packaging and printing device 130 switches to printing the top cover portion 240 with the top structural material. The top structural material generally uses a rigid insulating material, such as at least one of polycarbonate, polyether ether ketone, and polyetherimide. Optionally, the same material as the outer structural material is used as the top structural material. In addition, a positive and negative separator can be provided between the positive and negative electrodes of the battery. When the packaging and printing device 130 prints to form the top cover portion 240, the positive and negative separator can be printed simultaneously without additional printing steps. After printing the top cover portion 240, the printing of the battery packaging is completed, and one or more batteries placed in the bottom tray portion 210 are sealed in the battery packaging.

[0069] In one embodiment, the secondary battery manufacturing apparatus 100 based on 3D printing technology further includes a labeling device 160. The labeling device 160 is used to generate a radio frequency identification (RFID) label based on battery information. The labeling device 160 is connected to the processor 150 to obtain battery information such as the battery model, generate an RFID label, and the generated RFID label can be placed at the label mounting location 260 of the battery packaging 200 by the transfer device 140, as shown in Figure 2 shown.

[0070] In one embodiment, the secondary battery manufacturing apparatus 100 based on 3D printing technology may further include a sensor 170. Optionally, the sensor 170 can be a pressure sensor for obtaining the pressure information inside the battery packaging 200 and obtaining the airtightness information of the battery packaging 200 according to the change of the pressure information. For example, when the battery packaging 200 is placed in a vacuum airtightness detection device, if the pressure inside the battery packaging 200 drops significantly, it indicates that the airtightness of the battery packaging is poor. The sensor 170 can be a temperature sensor for obtaining the temperature information inside the battery packaging 200 and obtaining the safety status information of the battery according to the change of the temperature information. For example, when the temperature inside the battery packaging 200 suddenly rises, it indicates that there is a safety hazard in the battery, such as an explosion, and at this time the safety status information is "abnormal". The sensor 170 can also be a humidity sensor for obtaining the humidity information inside the battery packaging 200 and obtaining the safety status information of the battery according to the change of the humidity information. For example, when the humidity inside the battery packaging 200 suddenly rises, it indicates that there is a safety hazard in the battery, such as leakage, and at this time the safety status information is "abnormal". The airtightness information of the battery packaging and / or the safety information of the battery obtained by the sensor 170 can be sent to the processor 150 or the alarm 180.

[0071] In one embodiment, the secondary battery preparation device 100 based on 3D printing technology may further include an alarm 180. The alarm 180 obtains safety status information from the processor 150 or the sensor 170. When the safety status information is "normal", the alarm 180 does not emit an alarm signal. When the safety status information is "abnormal", the alarm 180 emits an alarm signal. The alarm signal includes but is not limited to at least one of a sound signal, a light signal, and a text signal.

[0072] In one embodiment, before the battery is packaged, it further includes the step of forming an insulating film on the bottom surface and the side wall of the battery. The secondary battery preparation device 100 based on 3D printing technology further includes an insulating film printing device. After printing an insulating layer on the outside of the battery case through the insulating film printing device, the battery is conveyed by a conveyor belt to the packaging printing device 130 for printing the battery packaging.

[0073] In one embodiment, referring to Figure 5 and Figure 6 as shown, the insulating film printing device includes a three-dimensional modeling system 510, a projection guiding system 520, and a spraying system 530.

[0074] The three-dimensional modeling system 510 is used to scan the battery 600 to be sprayed and generate a three-dimensional model of the battery. During the printing process, the battery is first conveyed by the production line to the insulating film printing device. Subsequently, the three-dimensional modeling system 510 scans and models the battery 600 to be sprayed, generating a three-dimensional model of the battery 600 to be sprayed. The three-dimensional model can accurately display the three-dimensional structure of the battery 600 to be sprayed. For example, the size of the battery 600 to be sprayed, the flatness of the surface, surface wear, concavities and convexities, etc. can all be displayed through the three-dimensional model. By way of example, the three-dimensional modeling system 510 can scan the battery 600 to be sprayed by laser, or the three-dimensional modeling system 510 can take a picture of the battery 600 to be sprayed and model a three-dimensional model based on the image of the battery 600 to be sprayed.

[0075] The projection guidance system 520 is used to determine the spraying boundary of the battery based on the three-dimensional model of the battery, obtain the thickness gradient information of the insulating layer to be sprayed, generate a projection image according to the spraying boundary and the thickness gradient information, and project the projection image onto the surface of the battery. The projection guidance system 520 identifies the spraying boundary of the battery 600 to be sprayed based on the three-dimensional model of the battery. For example, the battery 600 to be sprayed is a square battery, and the surfaces to be sprayed of the battery 600 to be sprayed include four side surfaces and a bottom surface. The projection guidance system 520 identifies the four side surfaces and the bottom surface according to the three-dimensional model, and obtains the spraying boundaries of the surfaces to be sprayed. The projection guidance system 520 obtains the thickness gradient information of the insulating layer to be sprayed on the battery. The thickness gradient information of the insulating layer to be sprayed is stored in an external database or in the database of the control system. The projection guidance system 520 obtains the thickness gradient information of the insulating layer to be sprayed from the database. The projection guidance system 520 calculates the thickness of the material to be sprayed in the area to be sprayed according to the thickness gradient information of the insulating layer to be sprayed. The projection guidance system 520 generates a projection image according to the spraying boundary and the thickness gradient information of the insulating layer to be sprayed, and projects the projection images corresponding to the surfaces to be sprayed onto the surfaces of the corresponding surfaces to be sprayed of the battery. Among them, the thickness of the printing material to be sprayed at each position is encoded in the projection image. It can be understood that the projection image is equivalent to a "spraying map", and the projection image can provide intuitive and accurate guidance for the spraying system 530 to achieve precise spraying.

[0076] The spraying system 530 is used to spray the projection image on the surface of the battery according to the three-dimensional model and the projection image, and spray the printing material with the corresponding thickness on the projection image. The spraying system 530 is used to spray the printing material on the surface of the battery 600 to be sprayed. The spraying system 530 sprays the printing material inside the spraying boundary of the projection image, and sprays the printing material with the corresponding thickness at each position of the projection image according to the thickness gradient information encoded in the projection image.

[0077] The insulating film printing device of the above embodiment scans the battery 600 to be sprayed through the three-dimensional modeling system 510 to generate a three-dimensional model of the battery. The projection guiding system 520 determines the spraying boundary of the battery based on the three-dimensional model of the battery, obtains the thickness gradient information of the insulating layer to be sprayed, generates a projection image according to the spraying boundary and the thickness gradient information, projects the projection image onto the surface of the battery, and the spraying system 530 sprays the projection image on the surface of the battery according to the three-dimensional model and the projection image, and sprays the printing material with a corresponding thickness on the projection image; the three-dimensional model of the battery generated by the three-dimensional modeling system 510 can clearly display the topography of the surface of the battery housing, and the unevenness or wear on the surface of the battery can be constructed by the three-dimensional model. The projection guiding system 520 generates a projection image according to the three-dimensional model of the battery, and the projection guiding system 520 projects the projection image onto the surface of the battery. The projection image can show the spraying boundary and the thickness gradient information to be sprayed, so that the spraying system 530 can spray according to the projection image, improving the efficiency and accuracy of the spraying operation, meeting the requirements of insulating layer spraying for batteries of different shapes and sizes, and realizing high-precision and customized spraying of the insulating layer on the surface of the battery; in the insulating film printing device of this embodiment, the three-dimensional modeling system 510, the projection guiding system 520, and the spraying system 530 cooperate to make the printing material sprayed by the spraying system 530 fit the surface of the battery. The spraying system 530 sprays according to the thickness gradient information shown by the projection image, which can effectively improve the problems of insufficient spraying or too thick spraying, improve the spraying effect, and reduce additional costs such as rework caused by spraying mistakes.

[0078] In some embodiments, referring to Figure 7 , the three-dimensional modeling system 510 includes a camera module 511, a modeling module 512, and an attitude calibration module 513.

[0079] The camera module 511 is used to scan the surface images of the battery from multiple perspectives. Among them, the camera module 511 takes pictures of the battery from multiple perspectives to obtain the surface images of the battery from multiple perspectives. The surface images from multiple perspectives include all details of the battery surface, such as unevenness, wear, marks, dimensions, etc. In this embodiment, the camera module 511 may include a 3D camera. The camera module 511 uses 3D vision technology to perform three-dimensional modeling on the battery 600 to be sprayed through the 3D camera, which can accurately capture the three-dimensional information on the surface of the battery, and is beneficial to improving the problem of inaccurate spraying caused by surface defects of the battery housing.

[0080] A modeling module 512, configured to generate multi-view three-dimensional point cloud data based on surface images of a battery from multiple perspectives, splice the multi-view three-dimensional point cloud data, and perform data modeling to obtain a three-dimensional model. The modeling module 512 processes surface images of the battery from multiple perspectives, and extracts three-dimensional point cloud data from the surface images of each perspective. The three-dimensional point cloud data is a set composed of a large number of three-dimensional coordinate points, and these coordinate points represent the positions of the battery surface in three-dimensional space. The modeling module 512 splices the three-dimensional point cloud data from different perspectives, and after splicing the three-dimensional point cloud data from all perspectives, performs modeling to obtain a three-dimensional model. In this embodiment, the modeling module 512 splices the three-dimensional point cloud data from different perspectives through iterative closest point, so that the point cloud data from different perspectives can be aligned, so that the formed three-dimensional model can restore the morphology and details of the battery surface. In this embodiment, the modeling module 512 generates a three-dimensional model of the battery based on 3D vision technology for visualization modeling, and the three-dimensional shape and features of the battery, such as the structure, morphology, and pose data of the battery, can be visually observed through a display screen on the device or other visualization tools.

[0081] The pose calibration module 513 is used to compare the three-dimensional model with the reference model to detect the size deviation and deformation of the battery, correct the three-dimensional model according to the size deviation and deformation results of the battery, calibrate the pose data of the battery according to the corrected three-dimensional model, and send the corrected three-dimensional model and the calibrated pose data to the projection guidance system 520. The pose calibration module 513 is communicatively connected to the modeling module 512 to obtain the three-dimensional model of the battery 600 to be sprayed. The pose calibration module 513 obtains the corresponding reference model according to the model or identification of the battery 600 to be sprayed. The reference model can be stored in the database of the control system or an external database. The pose calibration module 513 determines the corresponding reference model in the database for the battery according to the identification captured by the camera module 511. Alternatively, the pose calibration module 513 can receive the model of the battery sent from an external device and match the corresponding reference model in the database according to the battery model. The reference model is a three-dimensional modeling of a reference battery. The pose calibration module 513 compares the battery 600 to be sprayed with the reference battery to determine whether there is deformation or size deviation of the battery relative to the reference battery. If battery deformation (such as expansion and contraction or other irregular deformations) is detected, the pose calibration module 513 extracts the point cloud data of the deformed area from the three-dimensional model, fits the extracted point cloud data using the B-spline algorithm, generates a surface close to the deformation of the battery, and replaces the surface originally modeled by the three-dimensional model with the corrected surface. If the pose calibration module 513 corrects the three-dimensional model, the pose calibration module 513 calibrates its pose data according to the corrected three-dimensional model, matches the pose data of the three-dimensional model before correction with the features of the corrected three-dimensional model, calculates the calibrated pose data, and calculates attitude angles such as yaw angle, pitch angle, and roll angle based on the calibrated pose data. The three-dimensional modeling system 510 sends the corrected three-dimensional model and the calibrated pose data to the projection guidance system 520. If the pose calibration module 513 does not correct the three-dimensional model, the three-dimensional modeling system 510 directly sends the three-dimensional model and its pose data to the projection guidance system 520.

[0082] For the insulating film printing device in the above embodiment, the camera module 511 takes multi-view images of the battery to obtain multi-view surface images of the battery. The modeling module 512 processes the multi-view surface images of the battery to generate multi-view three-dimensional point cloud data, stitches the multi-view three-dimensional point cloud data to model the three-dimensional model of the battery. The pose calibration module 513 detects and corrects the three-dimensional model of the battery to improve the modeling accuracy of the three-dimensional model. The pose calibration module 513 calibrates the pose data according to the corrected three-dimensional model, which can provide accurate position and pose information for the projection guidance system 520 and is beneficial to the execution of subsequent spraying operations.

[0083] In some embodiments, referring to Figure 8The projection guidance system 520 includes an image generation module 521, a projection module 522, a fine-tuning module 523, and a tracking compensation module 524:

[0084] The image generation module 521 is used to determine the spraying boundary based on the three-dimensional model and posture data of the battery, and encode the thickness gradient information into the color of the projected image. The image generation module 521 generates the projected image based on the color encoding of the spraying boundary and the thickness gradient information. The image generation module 521 receives the three-dimensional model and posture data of the battery sent by the three-dimensional modeling system 510 to determine the spraying boundary. Taking a square battery as an example, the battery's surface to be sprayed is the four side surfaces and the bottom surface. The image generation module 521 extracts a 2mm wide closed curve at the edge of the surface to be sprayed based on the three-dimensional model and posture data of the battery to generate the spraying boundary. The spraying boundary is a closed curve. The image generation module 521 encodes the spraying thickness gradient information into the color of the projected image. Each thickness gradient corresponds to a different color. The range of each thickness step can be set by the control system of the printing device, or by a third-party user terminal, or the image generation module 521 can generate it based on previous experience. For example, a thickness interval of 1 nm is used as a thickness gradient, 0-1 nm is a thickness gradient, and 1 nm-2 nm is a thickness gradient. The thickness gradient of 0-1 nm and the thickness gradient of 1 nm-2 nm are encoded as different colors. Taking a square battery as an example, the thickness of the insulating layer to be sprayed in the edge area of the sprayed surface is 2 nm, and the thickness of the insulating layer to be sprayed in the center area is 5 nm. The image generation module 521 encodes the edge area of the sprayed surface as the color corresponding to the 1 nm-2 nm thickness gradient, and encodes the center area as the color corresponding to the 4 nm-5 nm thickness gradient, so that the spraying thickness of different areas can be intuitively distinguished during projection. The image generation module 521 generates a color-coded projection image containing the spraying boundary and thickness gradient information.

[0085] Projection module 522 is used to project a projection image onto the surface of the battery. Projection module 522 projects the projection image generated by projection image generation module 521 onto the surface of the battery 600 to be sprayed. Projection module 522 simultaneously acquires the projection image and the battery's position data. Based on the battery's position data, projection module 522 projects the projection image onto the corresponding position in the printing device, so that the projection image is projected onto the battery's surface to be sprayed, and the image edge (spraying boundary) of the projection image coincides with the boundary of the surface to be sprayed. In this embodiment, projection module 522 includes a laser projector with a wavelength of 450nm-650nm, which can adapt to the surface reflectivity of different battery models. The laser projector is integrated with a motorized zoom lens, has a projection accuracy of ±0.1mm, and a working distance of 200-500mm.

[0086] The fine-tuning module 523 is used to adjust the projection boundary of the projection image projected on the surface of the battery. According to the projection boundary of the projection image on the surface of the battery, when the fine-tuning module 523 detects that the boundary of the projection image deviates from the boundary of the battery, it adjusts the projection module 522 to adjust the position of the projection image, so as to guide the projection module 522 to project, so that the boundary of the projection image coincides with the boundary of the surface to be sprayed of the battery. In this embodiment, the fine-tuning module 523 can be automatically adjusted, or the user can operate the printing device. The fine-tuning module 523 adjusts the boundary of the projection image according to the fine-tuning instruction input by the user.

[0087] The tracking compensation module 524 compensates for projection distortion through a ray tracing algorithm according to the surface curvature of the battery, so that the projection image fits the surface of the battery. The tracking compensation module 524 simulates the propagation path of light on the surface of the battery, simulates the influence of the surface curvature of the battery on light, and calculates and compensates for the distortion in the projection image according to the result of ray tracing, so that the projection image can fit the surface of the battery.

[0088] In the insulating film printing device of this embodiment, the image generation module 521 generates a color-coded projection image including spraying boundary and thickness gradient information, and the projection module 522 projects the projection image onto the surface of the battery to project the spraying boundary and thickness gradient information onto the battery. The fine-tuning module 523 adjusts the projection accuracy of the projection image so that the boundary of the projection image coincides with the boundary of the surface to be sprayed of the battery. The tracking compensation module 524 compensates for the distortion in the projection image so that the projection image can fit the surface of the battery, ensuring that the projection image is accurately projected onto the battery. Through the coordinated work of the image generation module 521, the projection module 522, the fine-tuning module 523, and the tracking compensation module 524, the projection image is accurately projected onto the battery, so that the spraying operation can be carried out according to the guidance of the projection image, improving the spraying efficiency and spraying quality. At the same time, the fine-tuning module 523 and the tracking compensation module 524 improve the flexibility and adaptability of the projection, and can be applied to batteries of different shapes and sizes. Whether it is a square battery, a cylindrical battery, or other shaped batteries, the projection image can be projected onto the surface to be sprayed of the battery, and the projection image can fit the surface of the battery, and can guide the spraying operations of various shaped and sized batteries.

[0089] In some embodiments, the projection guidance system 520 further includes a monitoring module:

[0090] The monitoring module is used to monitor the spraying progress of the spraying system 530 and send the spraying progress to the image generation module 521. The monitoring module can detect the spraying progress of the spraying system 530 through laser, and monitor the spraying operation on the battery surface. For example, the spraying progress may include parameters such as the thickness of the printing material on the battery surface and the completion of the spraying operation. The monitoring module sends the spraying progress to the image generation module 521 in real time. The image generation module 521 recodes the color of the projection image according to the spraying progress and the thickness gradient information of the insulating layer to be sprayed, and updates the projection image. The projection module 522 projects the updated projection image onto the surface of the battery, and the spraying system 530 sprays the battery according to the updated projection image. In this embodiment, when the thickness gradient of the insulating layer to be sprayed on the battery surface detected by the monitoring module changes, the image generation module 521 updates the color of the projection image according to the changed thickness gradient. For example, if the thickness of the insulating layer to be sprayed in the central area of the battery decreases from 5 nm to 3.5 nm, and the thickness gradient of the insulating layer to be sprayed in the central area changes from a thickness gradient of 4 nm - 5 nm to a thickness gradient of 3 nm - 4 nm, then the image generation module 521 encodes the color of the central area as the color corresponding to the thickness gradient of 3 nm - 4 nm, and projects the updated projection image onto the battery.

[0091] In the insulating film printing device of this embodiment, the monitoring module detects the spraying progress, and the image generation module 521 dynamically adjusts the projection image according to the spraying progress, which is beneficial to improving the accuracy of guiding the spraying operation, so that the spraying operation can form the expected thickness requirement of the insulating layer and improve the spraying quality.

[0092] In some embodiments, the monitoring module interacts with the camera module 511 of the three-dimensional modeling system 510 to monitor the spraying progress of the spraying system 530. In this embodiment, during the spraying operation, the three-dimensional modeling system 510 captures multi-view images of the battery being sprayed in real time, generates multi-view three-dimensional point cloud data based on the multi-view surface images, and stitches the multi-view three-dimensional point cloud data to obtain the current three-dimensional model of the battery being sprayed; the monitoring module compares the current three-dimensional model of the battery with the three-dimensional model of the battery 600 to be sprayed to obtain the spraying progress of the spraying system 530.

[0093] In some embodiments, referring to Figure 5 , the spraying system 530 includes a plurality of spraying components 531, a moving module 532, and a control module 533:

[0094] Multiple spraying components 531 are used to spray printing materials onto the battery, and the spraying angle of the spraying component 531 is adjusted according to the surface curvature of the battery. In this embodiment, the spraying component 531 includes a nozzle 5311 and a spraying driving mechanism 5312 for controlling the spraying angle of the nozzle 5311. In this embodiment, the spraying system 530 includes at least five spraying components 531. For example, the spraying system 530 may include five spraying components 531, six spraying components 531 or more. In this embodiment, the battery to be sprayed is a square battery, and the surfaces to be sprayed of the battery include four side surfaces and one bottom surface, a total of five surfaces. At least five spraying components 531 of the spraying system 530 can satisfy the simultaneous spraying of the five surfaces to be sprayed of the battery with five surfaces to be sprayed. In some other embodiments, the surfaces to be sprayed of the square battery include the top surface, the bottom surface and four side surfaces of the square battery, a total of six surfaces, and the area to be sprayed on the top surface is the area except the pole column.

[0095] A moving module 532 is used to move the spraying component 531 and adjust the spraying position of the spraying component 531. In this embodiment, the spraying system includes a plurality of moving modules 532, and each moving module 532 is used to correspondingly adjust the position of one spraying component 531. Each moving module 532 includes a guide rod 5321 connected to the spraying component 531 and a first horizontal driving mechanism 5322, a second horizontal driving mechanism 5323 and a vertical driving mechanism 5324 for controlling the movement of the guide rod 5321. The first horizontal driving mechanism 5322 moves along a first direction (x direction) parallel to the printing platform 543, the second horizontal driving mechanism 5323 moves along a second direction (y direction) parallel to the printing platform 543, the first direction is perpendicular to the second direction, and the vertical driving mechanism 5324 moves along a direction perpendicular to the height (z direction) of the printing platform 543. The moving module 532 is used to move the spraying component 531 it controls to move the spraying component 531 to a suitable position, adjust the spraying angle according to the surface curvature of the battery, improve the spraying efficiency and optimize the spraying effect.

[0096] A control module 533 is used to determine the spraying path of the spraying system 530 according to the three-dimensional model and the projection image, and control the moving module 532 to move the spraying component 531 according to the spraying path. To ensure that the spraying component 531 can spray precisely according to the predetermined path, improve the spraying efficiency and accuracy. The control module 533 generates a spraying path based on the path planning algorithm according to the three-dimensional model and the projection image. The path planning algorithm is an algorithm about parameters such as spraying efficiency, material consumption, and thickness gradient information of the area to be sprayed. The control module 533 converts the spraying path into a control instruction and sends it to the moving module 532, so that the moving module 532 moves the spraying component 531 according to the control instruction along the spraying path to spray printing materials onto the battery.

[0097] The insulating film printing device of this embodiment realizes intelligent spraying on the surface of the battery through multiple spraying components 531, a moving module 532, and a control module 533, improving the spraying accuracy.

[0098] In some embodiments, the control module 533 adjusts the spraying path according to the spraying progress of the spraying system 530, and controls the moving module 532 to move the spraying component 531 to spray the battery according to the adjusted spraying path.

[0099] For the insulating film printing device of this embodiment, the control module 533 dynamically adjusts the spraying path according to the spraying progress, which can minimize the waste during the spraying process and improve the spraying efficiency.

[0100] In some embodiments, after the insulating film printing device finishes spraying the battery, the three-dimensional modeling system 510 takes a picture of the sprayed battery, models to obtain the three-dimensional model of the sprayed battery, and the monitoring module determines whether there is an area with insufficient spraying according to the three-dimensional model of the sprayed battery. If there is an area with insufficient spraying, the monitoring module sends the detection result to the control module 533, and the control module 533 starts the spraying system 530 to make up the spraying for the area with insufficient spraying.

[0101] In some embodiments, with reference to Figure 5 、 Figure 6 , the insulating film printing device further includes:

[0102] A frame 540, and the spraying system 530 is arranged in the frame 540. The frame 540 can be a metal frame 540. The frame 540 includes a body (not shown in the figure) and a machine cover (not shown in the figure). The machine cover is arranged on the body, and a printing space is formed between the machine cover and the body. The machine cover can be opened to facilitate the transmission of the battery.

[0103] A printing platform 543, arranged in the frame 540. The printing platform 543 is located below the spraying system 530. The printing platform 543 is used to carry the battery. A groove is arranged on one side of the printing platform 543 facing the spraying system 530 for accommodating the pole columns of the battery. The printing platform 543 is arranged in the printing space of the body. When printing the insulating layer on the surface of the battery, the top surface of the battery is placed on the printing platform 543, and the pole columns on the top surface of the battery are accommodated in the groove to avoid damaging the pole columns of the battery.

[0104] A heating module 550, used to heat the printing platform 543; the heating module 550 can be arranged at the bottom of the printing platform 543. The heating module 550 is used to heat the printing platform 543 to keep the surface of the battery at a suitable temperature, avoiding premature curing of the printing material on the surface of the battery and affecting the printing effect. In this embodiment, the temperature at which the heating module heats the printing platform 543 is 40°C - 80°C.

[0105] The curing module 560 is used to cure the printing material on the surface of the battery after spraying is completed, so as to form an insulating layer. In this embodiment, the curing module 560 is arranged inside the frame 540. The curing module 560 is located in the upper space above the printing. The curing module 560 cures the printing material to form an insulating layer. In this embodiment, the curing module 560 can be an ultraviolet curing lamp. In other embodiments, the curing module 560 can be arranged outside the frame 540.

[0106] In some embodiments, the printing device further includes a feeding device 570. The feeding device 570 is arranged on the outer wall of the machine body. The feeding device 570 is connected to the spraying component 531 of the spraying system 530 and is used to supply the printing material to the spraying component 531.

[0107] The printing device of this embodiment can further improve the printing effect through the heating module 550 and the curing module 560, avoid premature curing of the printing material, is conducive to optimizing the uniform distribution and curing process of the printing material, optimizing the quality of the insulating layer, and reducing the defects of delamination and peeling of the insulating layer.

[0108] In some embodiments, the insulating film printing device is connected to the processor 150. The processor 150 is used to control the spraying system to spray the projection image on the surface of the battery according to the three-dimensional model and the projection image. The processor controls the printing process of the printing device. The processor is used for the process of controlling the three-dimensional modeling system to scan the battery to be sprayed and generate the three-dimensional model of the battery, the process of the processor controlling the projection guiding system to generate the projection image and project the projection image onto the surface of the battery, and the process of the processor controlling the spraying system to spray the projection image on the surface of the battery according to the three-dimensional model and the projection image and spray the printing material with a corresponding thickness on the projection image. The processor is controllably connected to the three-dimensional modeling system, the projection guiding system and the spraying system. A real-time feedback mechanism is established through data transmission between the processor and the three-dimensional modeling system, the projection guiding system and the spraying system.

[0109] The present invention also provides a method for manufacturing a secondary battery based on 3D printing technology, which is applied to the secondary battery manufacturing device based on 3D printing technology as described above, as Figure 3 shown. The method includes the following steps:

[0110] S301: Obtain battery information, where the battery information includes at least one of battery model, battery size, battery shape, battery weight, battery quantity, and battery arrangement;

[0111] S302: Generate a 3D printing model of the battery package based on the battery information. The battery package includes at least a bottom part and a main body part. Among them, an anti-sticking structure is provided on at least one contact surface between the battery package and the battery;

[0112] S303: Print and form the bottom part based on the 3D printing model of the battery package;

[0113] S304: Place at least one battery in the base part based on battery information;

[0114] S305: Print and form a main body part on the base part based on a 3D printing model of a battery package to seal at least one battery within the battery package.

[0115] In one embodiment, a secondary battery preparation device 100 based on 3D printing technology includes an information acquisition device 110, a modeling device 120, a package printing device 130, a material transfer device 140, and a processor 150, wherein the acquisition device 110, the modeling device 120, the package printing device 130, and the material transfer device 140 are all connected to the processor 150. The processor 150 is configured to execute a method for preparing a secondary battery based on 3D printing technology: First, acquire battery information through the information acquisition device 110. The information acquisition device 110 can acquire battery information such as battery model, battery size, battery shape, battery weight, battery quantity, and battery arrangement by scanning a label, scanning a battery, or human-computer interaction, etc.; Then, perform modeling operations such as battery modeling and battery package modeling according to the acquired battery information through the modeling device 120 to generate a 3D printing model of the battery package; Then, perform 3D printing according to the generated 3D printing model of the battery package through the package printing device 130. First, print the base part 210, and then place one or more batteries of the same model in the same base part 210 through the material transfer device 140. Then, continue 3D printing according to the generated 3D printing model of the battery package through the printing device 130, and print the sealing ring 250, the outer baffle part 220, the internal partition part 230, and the top cover part 240 in sequence to complete the printing of the battery package 200, and seal the battery in the battery package 200 formed by 3D printing.

[0116] Refer to Figure 2 As shown, first, the package printing device 130 prints and forms the base part 210. Specifically, the package printing device 130 prints the bottom structural material to form the base part 210. The bottom structural material generally adopts a rigid insulating material, such as at least one of polycarbonate, polyether ether ketone, and polyetherimide. Optionally, polyether ether ketone (PEEK) is used as the bottom structural material, which can not only improve the rigidity of the base part 210 but also improve the heat resistance. Refer to Figure 2As shown, the base part 210 includes one or more grooves for placing the battery, and the size of the groove is greater than or equal to the size of the battery. By making the size of the groove greater than the size of the battery, it is ensured that the battery can be placed in the groove. For example, the size of the groove can be 2 mm to 5 mm larger than the size of the battery, so that the battery can be placed in the groove and at the same time, the battery can be prevented from shaking or colliding in a groove with too large a size. By making the size of the battery equal to the size of the groove, the battery can be stuck in the groove to prevent the battery from shaking in the groove. In addition, an anti-sticking structure can be provided on the surface of the base part 210 in contact with the bottom surface of the battery. The anti-sticking structure includes, but is not limited to, bumps. The size range of the bumps includes 0.3 mm to 0.5 mm. A honeycomb-shaped or grid dot matrix-shaped bump array can be formed by arranging a plurality of evenly distributed bumps as the anti-sticking structure. When the packaging printing device 130 prints and forms the base part 210, the anti-sticking structure can be printed and formed at the same time without additional printing steps. Next, before printing and forming the main body part on the base part based on the 3D printing model of the battery packaging, it further includes the step of printing and forming a sealing ring on the base part. Refer to Figure 2 As shown, the sealing ring 250 is used for sealing and unsealing between the base part 210 and the main body part. Specifically, after the battery is placed in the base part 210, the packaging printing device 130 switches to print the sealing material to form the sealing ring 250. The sealing material usually adopts a thermoplastic material, such as at least one of polyurethane, polyethylene, and polyamide. Optionally, polyurethane (TPU) is used as the sealing material. It not only has good sealing performance and chemical stability and can be used to achieve the sealing between the base part 210 and the main body part, but also the sealing material can melt at 60°C to 80°C and has high mechanical properties and anti-aging ability, and can be used to achieve the unsealing between the base part 210 and the main body part. For example, it can be unsealed by heating the sealed part with infrared rays.

[0117] Next, printing and forming the main body part on the base part based on the 3D printing model of the battery packaging includes: printing the outer structure material on the base part based on the 3D printing model of the battery packaging to form the outer baffle part; printing the inner structure material inside the outer baffle part based on the 3D printing model of the battery packaging to form the inner partition part; printing the top structure material on the outer baffle part and the inner partition part based on the 3D printing model of the battery packaging to form the top cover part. Refer to Figure 2 and Figure 4As shown, the packaging and printing device 130 is also used to print the main body part on the bottom tray part 210. Further, the main body part includes an outer baffle part 220, an inner spacer part 230, and a top cover part 240. After printing and forming the sealing ring 250, the packaging and printing device 130 switches to printing the outer baffle part 220 with an outer structural material. The outer structural material generally uses a rigid insulating material, such as at least one of polycarbonate, polyetheretherketone, and polyetherimide. Optionally, using polycarbonate as the outer structural material not only has good electrical insulation but also has high impact resistance, which can provide good protection for the battery. In addition, polycarbonate has a relatively high melting point and can withstand the temperature fluctuations generated during the use of the battery core. In addition, an anti-sticking structure can be provided on the inner surface of the outer baffle part 220 in contact with the side of the battery. The anti-sticking structure can be formed by the bumps as described above, or after the battery is stuck in the groove of the bottom tray part 210, the anti-sticking can be achieved by setting an anti-sticking spacing between the outer baffle part 220 and the side wall of the battery.

[0118] Next, referring to Figure 2 and Figure 4 As shown, the packaging and printing device 130 is also used to print the inner spacer part 230 inside the outer baffle part 220. After printing and forming the outer baffle part 220, the packaging and printing device 130 switches to printing the inner spacer part 230 with an inner structural material. The inner structural material generally uses a flexible material, such as at least one of flexible photosensitive resin and thermoplastic elastomer. Optionally, using flexible photosensitive resin as the inner structural material has good elasticity and buffering performance, can effectively absorb external impacts, and also has good anti-wear, anti-aging, and chemical resistance. In addition, an anti-sticking structure can be provided on the surface of the inner spacer part 230 in contact with the side of the battery, which will not be elaborated here.

[0119] Next, referring to Figure 2 As shown, the packaging and printing device 130 is also used to print the top cover part 240 on the outer baffle part 220 and the inner spacer part 230. After printing and forming the inner spacer part 230, the packaging and printing device 130 switches to printing the top cover part 240 with a top structural material. The top structural material generally uses a rigid insulating material, such as at least one of polycarbonate, polyetheretherketone, and polyetherimide. Optionally, the same material as the outer structural material is used as the top structural material. In addition, a positive and negative separator can be provided between the positive and negative electrodes of the battery. When the packaging and printing device 130 prints and forms the top cover part 240, the positive and negative separator can be printed and formed simultaneously without additional printing steps. After printing the top cover part 240, the printing of the battery packaging is completed, and one or more batteries placed in the bottom tray part 210 are sealed in the battery packaging.

[0120] In one embodiment, the secondary battery preparation device 100 based on 3D printing technology further includes a labeling device 160, a sensor 170, and an alarm 180. The labeling device 160, the sensor 170, and the alarm 180 are all connected to the processor 150. The processor 150 is configured to execute a method for preparing a secondary battery based on 3D printing technology: generate a radio frequency identification (RFID) tag through the labeling device 160, and then place the RFID tag at the tag mounting location 260 of the battery package 200 through the transfer device 140. Obtain the pressure information, temperature information, and / or humidity information inside the battery package through the sensor 170, obtain the airtightness information of the battery package 200 based on the change in the pressure information, and obtain the safety status information of the battery based on the change in the temperature information and / or humidity information. Send an alarm signal through the alarm 180, and the alarm signal includes at least one of a sound signal, a light signal, and a text signal.

[0121] In one embodiment, the labeling device 160 is connected to the processor 150 to obtain battery information such as the battery model, generate an RFID tag based on the battery information, and the generated RFID tag can be placed at the tag mounting location 260 of the battery package 200 by the transfer device 140, as shown in Figure 2 the figure.

[0122] In one embodiment, the sensor 170 can be a pressure sensor for obtaining the pressure information inside the battery package 200 and obtaining the airtightness information of the battery package 200 based on the change in the pressure information. For example, when the battery package 200 is placed in a vacuum airtightness detection device, if the pressure inside the battery package 200 drops significantly, it indicates that the airtightness of the battery package is poor. The sensor 170 can be a temperature sensor for obtaining the temperature information inside the battery package 200 and obtaining the safety status information of the battery based on the change in the temperature information. For example, when the temperature inside the battery package 200 suddenly rises, it indicates that there is a safety hazard in the battery, such as an explosion, and at this time the safety status information is "abnormal". The sensor 170 can also be a humidity sensor for obtaining the humidity information inside the battery package 200 and obtaining the safety status information of the battery based on the change in the humidity information. For example, when the humidity inside the battery package 200 suddenly rises, it indicates that there is a safety hazard in the battery, such as leakage, and at this time the safety status information is "abnormal". The airtightness information of the battery package and / or the safety information of the battery obtained by the sensor 170 can be sent to the processor 150 or the alarm 180. The alarm 180 obtains the safety status information from the processor 150 or the sensor 170. When the safety status information is "normal", the alarm 180 does not send an alarm signal. When the safety status information is "abnormal", the alarm 180 sends an alarm signal. The alarm signal includes but is not limited to at least one of a sound signal, a light signal, and a text signal.

[0123] In one embodiment, before packaging the battery, it further includes the step of forming an insulating film on the bottom surface and side wall of the battery, including: scanning the battery to be sprayed to obtain a three-dimensional model of the battery; determining the spraying boundary of the battery based on the three-dimensional model of the battery, and obtaining the thickness gradient information of the insulating layer to be sprayed, generating a projection image according to the spraying boundary and the thickness gradient information, and projecting the projection image onto the surface of the battery; spraying the projection image on the surface of the battery according to the three-dimensional model and the projection image, and spraying printing materials with corresponding thicknesses on the projection image.

[0124] In one embodiment, scanning the battery to obtain a three-dimensional model of the battery includes: scanning the surface images of multiple perspectives of the battery, generating three-dimensional point cloud data of multiple perspectives based on the surface images of multiple perspectives of the battery; stitching the three-dimensional point cloud data of multiple perspectives, and performing data modeling to obtain a three-dimensional model; comparing the three-dimensional model with a reference model to detect the size deviation and deformation of the battery, correcting the three-dimensional model according to the size deviation and deformation results of the battery, and calibrating the pose data of the battery according to the corrected three-dimensional model.

[0125] In one embodiment, determining the spraying boundary of the battery based on the three-dimensional model of the battery, obtaining the thickness gradient information of the insulating layer to be sprayed, generating a projection image according to the spraying boundary and the thickness gradient information, and projecting the projection image onto the surface of the battery includes the following steps: determining the spraying boundary according to the three-dimensional model and pose data of the battery, encoding the thickness gradient information as the color of the projection image, generating a projection image according to the spraying boundary and the color encoding of the thickness gradient information; projecting the projection image onto the surface of the battery; adjusting the projection boundary of the projection image projected on the surface of the battery; compensating for projection distortion through a ray tracing algorithm according to the surface curvature of the battery, so that the projection image fits the surface of the battery.

[0126] According to the secondary battery preparation method and device based on 3D printing technology provided by the present invention, generating a battery package based on 3D printing technology can not only customize the package for the battery according to the size and shape of the battery, but also has the ability of rapid production and preparation, while avoiding waste of packaging materials. The generated battery package has good airtightness, avoiding moisture or other pollutants from entering the interior of the package, and improving the performance and safety of the battery.

[0127] Please note that the above embodiments are for illustrative purposes only and do not imply any limitation to the present application.

[0128] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0129] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0130] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A method for preparing a secondary battery based on 3D printing technology, characterized in that, Including the following steps: Obtain battery information, where the battery information includes at least one of battery model, battery size, battery shape, battery weight, number of batteries, and battery arrangement; Generate a 3D printing model of the battery packaging based on the battery information, where the battery packaging includes at least a bottom support part and a main body part. Among them, an anti-sticking structure is provided on at least one contact surface between the battery packaging and the battery; Print and form the bottom support part based on the 3D printing model of the battery packaging; Place at least one battery into the bottom support part based on the battery information; Print and form the main body part on the bottom support part based on the 3D printing model of the battery packaging to seal the at least one battery in the battery packaging.

2. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein The main body part includes an outer baffle part, an inner spacer part, and a top cover part; Printing and forming the main body part on the bottom support part based on the 3D printing model of the battery packaging includes: Printing an outer structure material on the bottom support part based on the 3D printing model of the battery packaging to form the outer baffle part; Printing an inner structure material inside the outer baffle part based on the 3D printing model of the battery packaging to form the inner spacer part; Printing a top structure material on the outer baffle part and the inner spacer part based on the 3D printing model of the battery packaging to form the top cover part, and the top cover part includes a positive and negative electrode separator for separating the positive and negative electrodes of the battery; Among them, the outer structure material and the top structure material include rigid insulating materials, the inner structure material includes flexible materials, the outer structure material, the top structure material, and the bottom structure material for forming the bottom support part include at least one of polycarbonate, polyether ether ketone, and polyetherimide, and the inner structure material includes at least one of flexible photosensitive resin and thermoplastic elastomer.

3. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein, Before printing and forming the main body part on the bottom support part based on the 3D printing model of the battery packaging, it further includes the step of printing and forming a sealing ring on the bottom support part, where the sealing ring is located between the bottom support part and the main body part and is used for sealing and unsealing between the bottom support part and the main body part; Among them, the sealing material for forming the sealing ring includes thermoplastic materials, and the sealing material can be heated and melted to unseal the bottom support part and the main body part; among them, the thermoplastic materials include at least one of polyurethane, polyethylene, and polyamide, and the melting temperature range of the thermoplastic materials is 60°C to 80°C.

4. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein, An anti-sticking structure is provided on the surface of the bottom support part in contact with the bottom surface of the battery and on the surface of the main body part in contact with the side surface of the battery. Among them, the anti-sticking structure includes a plurality of bumps, and the plurality of bumps are evenly distributed to form a bump array; or, A groove for fixing the battery is provided in the bottom support part, an anti-sticking structure is provided on the surface of the bottom support part in contact with the bottom surface of the battery, and an anti-sticking spacing is provided between the side surface of the battery and the main body part.

5. The method for preparing a secondary battery based on 3D printing technology according to claim 1, characterized in that It further includes: Scan the label to obtain at least one of the battery model and battery weight; And / or Scan the battery to obtain at least one of the battery size and battery shape.

6. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein Generating a 3D printing model of the battery package based on the battery information includes: Generating a battery model based on the battery information, and generating a 3D printing model of the battery package based on the battery information and the battery model.

7. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein Placing at least one battery in the bottom tray part based on the battery information includes: Placing at least two batteries with the same battery model in the same bottom tray part based on the battery information.

8. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein Further includes: Generating a radio frequency identification tag based on the battery information; Placing the radio frequency identification tag at the tag mounting position of the battery package.

9. The method for preparing a secondary battery based on 3D printing technology according to claim 1, wherein Further includes: Obtaining the pressure information inside the battery package, and obtaining the airtightness information of the battery package based on the change of the pressure information; And / or Obtaining the temperature information and / or humidity information inside the battery package, and obtaining the safety status information of the battery based on the change of the temperature information and / or humidity information.

10. The method for preparing a secondary battery based on 3D printing technology according to claim 9, wherein Further includes: Obtaining the safety status information, and sending an alarm signal when the safety status information is abnormal, and the alarm signal includes at least one of a sound signal, a light signal, and a text signal.

11. A secondary battery preparation device based on 3D printing technology, characterized in that, Includes: An information acquisition device for acquiring battery information, where the battery information includes at least one of a battery model, a battery size, a battery shape, a battery weight, a battery quantity, and a battery arrangement; A modeling device for generating a 3D printing model of the battery package based on the battery information, where the battery package at least includes a bottom tray part and a main body part, and where at least one contact surface between the battery package and the battery is provided with an anti-sticking structure; A packaging printing device for: Printing to form the bottom tray part based on the 3D printing model of the battery package; and Printing to form the main body part on the bottom tray part based on the 3D printing model of the battery package to seal at least one battery in the battery package; An object transfer device for placing at least one battery in the bottom tray part based on the battery information.

12. The secondary battery preparation device based on 3D printing technology according to claim 11, wherein The packaging printing device is further configured to print a sealing ring on the bottom tray part before printing to form the main body part, and the sealing ring is located between the bottom tray part and the main body part for sealing and unsealing between the bottom tray part and the main body part.

13. The secondary battery preparation device based on 3D printing technology according to claim 11, wherein Further includes: A labeling device for generating a radio frequency identification tag based on the battery information; A sensor for obtaining the pressure information inside the battery package, and obtaining the airtightness information of the battery package based on the change of the pressure information; Or, for obtaining the temperature information and / or humidity information inside the battery package, and obtaining the safety status information of the battery based on the change of the temperature information and / or humidity information; An alarm for obtaining the safety status information and sending an alarm signal when the safety status information is abnormal, and the alarm signal includes at least one of a sound signal, a light signal, and a text signal; A processor, to which the information acquisition device, the modeling device, the packaging printing device, and the packaging printing device are all connected.

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