A digital manufacturing method and equipment for solid-state lithium battery electrodes

Abstract

This invention discloses a digital manufacturing method and equipment for solid-state lithium battery electrodes, belonging to the field of electrode material manufacturing. It includes: a printing platform with an external control system mounted on it; a print head slidably mounted on the upper end of the printing platform, with a water-cooling mechanism on its outer side and a curing mechanism at its lower end; an electrode material tube fixedly mounted on the lower end of the print head for ejecting electrode material; a conductive agent tube fixedly mounted on the lower end of the print head for ejecting conductive agent; and an additive tube fixedly mounted on the lower end of the print head for ejecting additive, with a nitrogen protection mechanism on its outer side. This method can reduce interference between components during solid-state lithium battery electrode printing, ensuring that different components are cured to their corresponding positions in the digital skeleton model, thus reducing the likelihood of the solid-state lithium battery electrode being demolded during printing.

Description

Technical Field

[0001] The present invention relates to the field of electrode material manufacturing, and more specifically, to a digital manufacturing method and equipment for solid-state lithium battery electrodes. Background Art

[0002] Lithium battery is an important device for storing electrical energy. It consists of a shell, electrolyte, positive electrode and negative electrode. Nowadays, lithium battery electrodes are often manufactured by 3D printers. The 3D printer first builds a lithium battery electrode model through digital modeling, and then moves the print head on the X-axis, Y-axis and Z-axis to spray out electrode materials (inorganic or organic material powders). The electrode materials are instantly cured by laser to digitally manufacture lithium battery electrodes.

[0003] Through patent search, it is found that the Chinese patent with publication number CN108136674B discloses a multi-nozzle 3D printing nozzle and printing method and 3D printing system. The device includes a printing nozzle, a printing platform, a nozzle, a nozzle seat and a nozzle seat. Although the printing nozzle and the printing platform are relatively moved in three directions of x, y and z, and the nozzle seat or the nozzle seat is controlled to rotate relative to the printing platform, at least two nozzles are moved along the corresponding printing path respectively, and multiple areas can be printed at the same time, which can effectively improve the printing speed and the flexibility of multiple nozzles to quickly follow various curvatures and different spacing printing paths, and can meet various needs in practical applications;

[0004] However, it does not solve the problem that in the process of printing solid-state lithium battery electrodes, although multiple areas are printed through multiple nozzles in the existing multi-nozzle 3D printing nozzles, printing methods and 3D printing systems, the solid-state lithium battery electrodes are composed of electrode materials, conductive agents, adhesives and additives. The temperature conditions for processing each component of the solid-state lithium battery electrode are different, and the processing is prone to interference, resulting in easy demolding when different components of the solid-state lithium battery electrode are printed at the same time, which increases the stress inside the solid-state lithium battery electrode. It is necessary to print each component of the solid-state lithium battery electrode separately. By increasing the number of 3D prints to print each component of the solid-state lithium battery electrode separately, it is easy to increase the cost of manufacturing solid-state lithium battery electrodes. For this reason, we propose a digital manufacturing method and equipment for solid-state lithium battery electrodes. Summary of the invention

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a digital manufacturing method and equipment for solid-state lithium battery electrodes, which can reduce the components that interfere when printing solid-state lithium battery electrodes, so that different components can be solidified to the corresponding positions of the digital skeleton model, thereby reducing the occurrence of solid-state lithium battery electrodes being demolded during printing.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A digital manufacturing equipment for solid-state lithium battery electrodes, comprising:

[0010] A printing platform, on which an external control system is laid;

[0011] A print head, wherein the print head is slidably mounted on the upper end of the printing platform, a water cooling mechanism is disposed on the outer side of the print head, and a curing mechanism is disposed on the lower end of the print head;

[0012] An electrode material tube, which is fixedly mounted at the lower end of the print head and is used to eject the electrode material;

[0013] A conductive agent tube, which is fixedly mounted at the lower end of the print head and is used to spray the conductive agent;

[0014] An additive tube, which is fixedly mounted at the lower end of the print head and is used to spray the additive, and a nitrogen protection mechanism is provided on the outer side of the additive tube;

[0015] An adhesive tube is fixedly mounted at the lower end of the print head and is used for spraying adhesive.

[0016] Furthermore, the curing mechanism comprises:

[0017] Laser heads, wherein the three laser heads are fixedly mounted at the lower end of the print head and are respectively aligned with the discharge ports of the electrode material tube, the conductive agent tube and the additive tube;

[0018] Material sensors, the three material sensors are respectively fixedly installed on the outside of the electrode material tube, the outside of the conductive agent tube and the outside of the additive tube.

[0019] Furthermore, one end of the electrode material tube passes through the print head and is fixedly installed with an electrode material pump, an electric valve a is fixedly installed at the feed port of the electrode material pump, and an electrode material box is fixedly installed at one end of the electric valve a away from the electrode material pump.

[0020] Furthermore, one end of the conductive agent tube passes through the print head and is fixedly installed with a conductive agent pump, an electric valve b is fixedly installed at the feed port of the conductive agent pump, and a conductive agent box is fixedly installed at one end of the electric valve b away from the conductive agent pump.

[0021] Furthermore, one end of the additive tube passes through the print head and is fixedly installed with an additive pump, an electric valve c is fixedly installed at the feed inlet of the additive pump, and an additive tank is fixedly installed at one end of the electric valve c away from the additive pump.

[0022] Furthermore, one end of the adhesive tube passes through the print head and is fixedly mounted with an adhesive pump, an electric valve d is fixedly mounted at the feed port of the adhesive pump, and an adhesive box is fixedly mounted at one end of the electric valve d away from the adhesive pump.

[0023] Furthermore, the water cooling mechanism comprises:

[0024] A water inlet pipe, the water inlet pipe is fixedly mounted on the outside of the print head, and the outside of the water inlet pipe is close to the outside of the laser head, and both ends of the water inlet pipe are far away from the print head;

[0025] A water pump, wherein the output end of the water pump is fixedly connected to one end of the water inlet pipe;

[0026] A water tank, wherein the water inlet of the water tank is fixedly connected to an end of the water inlet pipe away from the water pump;

[0027] A connecting pipe, one end of which is fixedly connected to the water inlet end of the water pump, and the other end of which extends into the interior of the water tank.

[0028] Furthermore, the nitrogen protection mechanism includes:

[0029] A cylinder, the cylinder is fixedly mounted on the outside of the additive tube, and the cylinder is structured such that one end away from the print head is open;

[0030] A nitrogen pipe, wherein the nitrogen pipe is fixedly mounted on the inner wall of the cylinder, and one end of the nitrogen pipe extends out of the cylinder;

[0031] A plurality of guide plates are distributed on the inner wall of the cylinder along a circumferential array, and the guide plates are staggered with the nitrogen pipes in a horizontal direction.

[0032] Furthermore, an electric valve e is fixedly installed on one end of the nitrogen pipe extending out of the cylinder, a buffer tank is fixedly installed on one end of the electric valve e away from the nitrogen pipe, a barometer is fixedly installed on the outside of the buffer tank, and the air inlet of the buffer tank is connected to a nitrogen source.

[0033] A digital manufacturing method for a solid-state lithium battery electrode, the manufacturing method comprising the following steps:

[0034] S1. Stacking skeleton: A digital skeleton model of a solid-state lithium battery electrode is constructed by a computer, imported into an external control system on the printing platform, and then the print head is controlled to move, driving the electrode material tube to move to a specified position, and the electrode material tube ejects the electrode material, and the electrode material is solidified by a curing mechanism, and the skeleton of the solid-state lithium battery electrode is intermittently printed in layers;

[0035] S2. Inserting reinforcing ribs: In the gaps of the solid-state lithium battery electrode skeleton, the conductive agent tube is driven to move by the print head, the conductive agent tube sprays the conductive agent, and the conductive agent is cured by the curing mechanism, and reinforcing ribs in the shape of a three-dimensional grid are printed on each layer of the skeleton, and a filling cavity is formed in the gaps of the reinforcing ribs;

[0036] S3, adhesive filling: after the reinforcement ribs are printed, the adhesive tube is driven to move by the print head, and the adhesive tube sprays adhesive onto the inner wall of the filling cavity;

[0037] S4. Spatial particle laying: After each layer of filling cavity is filled with adhesive, the additive tube is driven by the print head to move, and the additive tube sprays additives into the filling cavity in a quantitative manner, and the additives are solidified by the curing mechanism to print spatial particles in the filling cavity of each layer.

[0038] 3. Beneficial effects

[0039] Compared with the prior art, the advantages of the present invention are:

[0040] (1) This scheme first constructs a digital skeleton model of a solid-state lithium battery electrode through a computer, imports it into an external control system on a printing platform, and then drives the electrode material tube, conductive agent tube, additive tube and adhesive tube to move to designated positions through an XYZ three-axis slide rail seat, and then sprays out the electrode material, conductive agent, adhesive and additive respectively, and solidifies them at different temperatures through a curing mechanism, which can reduce the components that interfere when printing the solid-state lithium battery electrode, so that different components can be cured to the corresponding positions of the digital skeleton model, reduce the occurrence of solid-state lithium battery electrodes being demolded during printing, and can relieve the stress inside the solid-state lithium battery electrode without increasing the number of 3D prints.

[0041] (2) In this scheme, when the additive tube sprays polystyrene powder, nitrogen is transported to the cylinder through the nitrogen tube. The nitrogen diffuses in the cylinder and the flow rate is reduced. It is evenly dispersed to the outside of each guide plate and flows out in a ring shape along the inner wall of the cylinder, so that the nitrogen forms an air wall to surround the polystyrene powder until the polystyrene powder is solidified by the light beam emitted by the print head. This can reduce the loss of nitrogen from the additive tube into the air and reduce the harm caused to the air by the polystyrene powder during printing. Subsequently, the nitrogen is lost into the air and is harmless to the environment.

[0042] (3) This solution uses a water pump and a connecting pipe to draw water from the water tank and transport it into the water inlet pipe. When the print head is working, there is a temperature difference between it and the water inlet pipe. The heat on the print head is absorbed by the water inlet pipe and taken away by the water flow, which facilitates the heat dissipation of the print head. There is no need to set up multiple fans to drive airflow to dissipate heat for the print head. Then the water with heat flows back to the water tank, and the water tank dissipates the heat into the air.

[0043] (4) This scheme prints the positive and negative electrodes of the lithium battery separately, and can use conductive agents to construct three-dimensional grid-shaped reinforcing ribs to strengthen the strength of the electrode skeleton. It can also facilitate the movement of electrons inside the skeleton along the reinforcing ribs. At the same time, the space particles in the filling cavity are wrapped with adhesive to increase the contact area between the electrode skeleton and the space particles, and to facilitate the distribution of the multi-layer array of space particles inside the skeleton. The staggered reinforcing ribs can further alleviate the stress inside the electrode, and the tensile strength and bending resistance of the electrode can be improved by polystyrene to reduce the number of electrodes that are broken and bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the structure of the main view of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the rear view of the present invention;

[0046] Figure 3 It is a schematic diagram of the structure of the present invention from a top view;

[0047] Figure 4 It is a schematic structural diagram of the side view of the present invention;

[0048] Figure 5 It is a schematic diagram of the structure of the print head of the present invention when viewed from above;

[0049] Figure 6 For the present invention Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0050] Figure 7 For the present invention Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0051] Figure 8 For the present invention Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0052] Fig. 9 Schematic diagram of the positive electrode structure of the lithium battery of the present invention;

[0053] Fig.10 It is a schematic diagram of the enlarged structure of the negative electrode of the lithium battery of the present invention;

[0054] Fig.11 The present invention is a flowchart of the manufacturing method of the present invention.

[0055] Description of the numbers in the figure:

[0056] 1. Printing platform; 2. Print head; 3. Electrode material tube; 4. Conductive agent tube; 5. Additive tube; 6. Adhesive tube; 7. Laser head; 8. Material sensor; 9. Electrode material pump; 10. Electric valve a; 11. Electrode material box; 12. Conductive agent pump; 13. Electric valve b; 14. Conductive agent box; 15. Additive pump; 16. Electric valve c; 17. Additive box; 18. Adhesive pump; 19. Electric valve d; 20. Adhesive box; 21. Water inlet pipe; 22. Water pump; 23. Water tank; 24. Connecting pipe; 25. Cylinder; 26. Nitrogen tube; 27. Guide plate; 28. Electric valve e; 29. ​​Buffer tank; 30. Barometer. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0058] Example:

[0059] See also Figure 1-11 , a digital manufacturing equipment for solid-state lithium battery electrodes, comprising:

[0060] Printing platform 1, an external control system is laid on the printing platform 1, and an XYZ three-axis slide rail seat is arranged on the upper end of the printing platform 1. This technical solution is a prior art and is not drawn in the figure;

[0061] The print head 2 is slidably mounted on the upper end of the printing platform 1, a water cooling mechanism is disposed on the outer side of the print head 2, and a curing mechanism is disposed on the lower end of the print head 2;

[0062] An electrode material tube 3, which is fixedly mounted at the lower end of the print head 2 and is used to eject the electrode material;

[0063] A conductive agent tube 4, which is fixedly mounted at the lower end of the print head 2 and is used to spray the conductive agent;

[0064] An additive tube 5, which is fixedly mounted at the lower end of the print head 2 and is used to spray the additive. A nitrogen protection mechanism is provided on the outer side of the additive tube 5;

[0065] The adhesive tube 6 is fixedly mounted at the lower end of the print head 2 and is used for spraying adhesive.

[0066] When the present invention is working, the solid-state lithium battery electrode is composed of electrode material, conductive agent, adhesive and additive, and the temperature conditions for processing each component are different. First, a digital skeleton model of the solid-state lithium battery electrode is constructed by a computer and imported into the external control system on the printing platform 1. Then, the electrode material tube 3, the conductive agent tube 4, the additive tube 5 and the adhesive tube 6 are respectively driven to move to the specified position by the XYZ three-axis slide seat, and then the electrode material, conductive agent, adhesive and additive are respectively sprayed out, and cured at different temperatures by the curing mechanism, which can reduce the components that interfere when the solid-state lithium battery electrode is printed, so that different components can be cured to the corresponding positions of the digital skeleton model, reduce the occurrence of printing demolding of the solid-state lithium battery electrode, and can relieve the stress inside the solid-state lithium battery electrode without increasing the number of 3D prints.

[0067] See also Figure 1 and Figure 3 , the curing mechanism includes:

[0068] Laser heads 7, three laser heads 7 are fixedly mounted at the lower end of the print head 2, and are respectively aligned with the discharge ports of the electrode material tube 3, the conductive agent tube 4, and the additive tube 5;

[0069] Material sensors 8, three material sensors 8 are respectively fixedly installed on the outside of the electrode material tube 3, the outside of the conductive agent tube 4 and the outside of the additive tube 5. The material of the material sensor 8 is an infrared sensor, which can send and receive laser beams to detect information about the distance of the object.

[0070] When the present invention is working, three material sensors 8 are used to monitor the component signals sprayed out of the discharge port of the electrode material tube 3, the discharge port of the conductive agent tube 4 and the discharge port of the additive tube 5 respectively, and transmit them to the external control system. When the external control system receives the specified component signal, it controls the laser head 7 at the corresponding position to work and emit a laser to heat the components sprayed out of the electrode material tube 3, the conductive agent tube 4 or the additive tube 5. Among them, the material of the electrode material is lithium iron phosphate powder, which requires the laser head 7 to heat and print at a temperature of not less than 300 degrees. The material of the adhesive is polyacrylic acid powder, polyamide powder or polyacrylate powder, which requires the laser head 7 to heat and print at a temperature of not less than 106 degrees. The material of the additive is polystyrene powder, which requires the laser head 7 to heat and print at a temperature of not less than 900 degrees.

[0071] See also Figure 2 , Figure 4 and Figure 7One end of the electrode material tube 3 passes through the print head 2 and is fixedly installed with an electrode material pump 9. An electric valve a10 is fixedly installed at the feed port of the electrode material pump 9. An electrode material box 11 is fixedly installed at one end of the electric valve a10 away from the electrode material pump 9. When it is necessary to spray out the electrode material, the electric valve a10 is controlled to open through an external control system, and the electrode material pump 9 is controlled to extract the powdered electrode material in the electrode material box 11 and transport it to the electrode material tube 3, so that the electrode material tube 3 sprays out the electrode material. Conversely, the electrode material tube 3 can be interrupted from spraying out the electrode material by closing the electric valve a10 and controlling the electrode material pump 9 to stop.

[0072] See also Figure 2 , Figure 4 and Figure 7 One end of the conductive agent tube 4 passes through the print head 2 and is fixedly installed with a conductive agent pump 12. An electric valve b13 is fixedly installed at the feed port of the conductive agent pump 12. A conductive agent box 14 is fixedly installed at one end of the electric valve b13 away from the conductive agent pump 12. When the conductive agent needs to be sprayed, the electric valve b13 is controlled to open through an external control system, and the conductive agent pump 12 is controlled to extract the powdered electrode material in the conductive agent box 14 and transport it to the conductive agent tube 4, so that the conductive agent tube 4 sprays the conductive agent. Conversely, the conductive agent tube 4 can be interrupted from spraying the conductive agent by closing the electric valve b13 and controlling the conductive agent pump 12 to stop.

[0073] See also Figure 2 , Figure 4 and Figure 7 One end of the additive tube 5 passes through the print head 2 and is fixedly installed with an additive pump 15. An electric valve c16 is fixedly installed at the feed port of the additive pump 15. An additive box 17 is fixedly installed at one end of the electric valve c16 away from the additive pump 15. When it is necessary to spray the additive, the electric valve c16 is controlled to open through an external control system, and the additive pump 15 is controlled to extract the powdered electrode material in the additive box 17 and transport it to the additive tube 5, so that the additive tube 5 sprays the additive. Conversely, the additive tube 5 can be interrupted from spraying the additive by closing the electric valve c16 and controlling the additive pump 15 to stop.

[0074] See also Figure 3 and Figure 8 , nitrogen protection mechanism includes:

[0075] The cylinder 25 is fixedly mounted on the outside of the additive tube 5, and the cylinder 25 is structured such that one end away from the print head 2 is open;

[0076] A nitrogen pipe 26, which is fixedly mounted on the inner wall of the cylinder 25, and one end of the nitrogen pipe 26 extends out of the cylinder 25;

[0077] A plurality of guide plates 27 are distributed in a circumferential array on the inner wall of the cylinder 25 , and the guide plates 27 are staggered from the nitrogen pipes 26 in the horizontal direction.

[0078] When the additive tube 5 sprays polystyrene powder, nitrogen is transported to the cylinder 25 through the nitrogen tube 26. The nitrogen diffuses in the cylinder 25 and the flow rate is reduced. It is evenly dispersed to the outside of each guide plate 27 and flows out in a ring shape along the inner wall of the cylinder 25, so that the nitrogen forms an air wall to surround the polystyrene powder until the polystyrene powder is solidified by the light beam emitted by the print head 2. This can reduce the loss of nitrogen from the additive tube 5 into the air and reduce the harm caused to the air by the polystyrene powder during printing. The nitrogen is then lost into the air and is harmless to the environment.

[0079] See also Figure 3 and Figure 8 An electric valve e28 is fixedly installed at one end of the nitrogen pipe 26 extending out of the cylinder 25, and a buffer tank 29 is fixedly installed at one end of the electric valve e28 away from the nitrogen pipe 26. A barometer 30 is fixedly installed on the outside of the buffer tank 29. The air inlet of the buffer tank 29 is connected to a nitrogen source. When the electric valve c16 is opened, the external control system synchronously opens the electric valve e28, and the nitrogen in the buffer tank 29 can flow along the electric valve e28 to replenish the nitrogen pipe 26. At the same time, the nitrogen input from the nitrogen source is dispersed through the buffer tank 29 to relieve the air pressure in the nitrogen pipe 26, so as to reduce the wind speed when the nitrogen is sprayed out, thereby reducing the polystyrene powder blown away when the nitrogen pipe 26 is blown. Conversely, the nitrogen spraying from the nitrogen pipe 26 can be blocked by closing the electric valve e28.

[0080] See also Figure 2 , Figure 5 and Figure 7 One end of the adhesive tube 6 passes through the print head 2 and is fixedly installed with an adhesive pump 18. An electric valve d19 is fixedly installed at the feed port of the adhesive pump 18. An adhesive box 20 is fixedly installed at the end of the electric valve d19 away from the adhesive pump 18. When the adhesive needs to be sprayed, the electric valve d19 is controlled to open through an external control system, and the adhesive pump 18 is controlled to extract the adhesive powder in the additive box 17 and transport it to the adhesive tube 6 so that the adhesive tube 6 sprays the adhesive powder. Conversely, the adhesive tube 5 can be interrupted from spraying the adhesive powder by closing the electric valve d19 and controlling the adhesive pump 18 to stop.

[0081] See also Figure 1 , Figure 2 and Figure 6 , the water cooling mechanism includes:

[0082] A water inlet pipe 21, which is fixedly mounted on the outside of the print head 2, and the outside of the water inlet pipe 21 is close to the outside of the laser head 7, and both ends of the water inlet pipe 21 are far away from the print head 2;

[0083] A water pump 22, wherein the output end of the water pump 22 is fixedly connected to one end of the water inlet pipe 21;

[0084] A water tank 23, wherein the water inlet of the water tank 23 is fixedly connected to an end of the water inlet pipe 21 away from the water pump 22;

[0085] A connecting pipe 24 , one end of which is fixedly connected to the water inlet end of the water pump 22 , and the other end of which extends into the water tank 23 .

[0086] When the present invention is working, water in the water tank 23 is extracted through the water pump 22 and the connecting pipe 24 and transported into the water inlet pipe 21. When the print head 2 is working, there is a temperature difference between it and the water inlet pipe 21. The heat on the print head 2 is absorbed by the water inlet pipe 21 and the heat is taken away by the water flow, which facilitates the heat dissipation of the print head 2. There is no need to set up multiple fans to drive the airflow to dissipate the heat of the print head 2. Then the water with heat flows back to the water tank 23, and the water tank 23 dissipates the heat into the air.

[0087] See also Figure 9-11 , a digital manufacturing method for a solid-state lithium battery electrode, the manufacturing method comprising the following steps:

[0088] S1. Stacking skeleton: A digital skeleton model of a solid-state lithium battery electrode is constructed by a computer, which is imported into an external control system on the printing platform 1, and then the print head 2 is controlled to move, driving the electrode material tube 3 to move to a specified position. The electrode material tube 3 ejects the electrode material, and solidifies the electrode material through a curing mechanism. The electrode material is made of lithium iron phosphate powder, which requires a laser head 7 to heat and print at a temperature not lower than 300 degrees, and is intermittently printed in layers to form a skeleton of a solid-state lithium battery electrode. At the same time, water is extracted from the water tank 23 through a water pump 22 and a connecting pipe 24, and transported into the water inlet pipe 21. When the print head 2 is working, there is a temperature difference between the print head 2 and the water inlet pipe 21. The heat on the print head 2 is absorbed by the water inlet pipe 21, and the heat is taken away by the water flow, which facilitates the heat dissipation of the print head 2. There is no need to set up multiple fans to agitate the airflow to dissipate the heat of the print head 2, and then the water flow with heat flows back to the water tank 23, and the water tank 23 dissipates the heat into the air;

[0089] S2, inserting reinforcing ribs: in the gaps of printing the solid-state lithium battery electrode skeleton, the conductive agent tube 4 is driven to move by the print head 2, the conductive agent tube 4 sprays out the conductive agent, and the conductive agent is cured by the curing mechanism. The conductive agent is made of carbon nanotube aqueous slurry, and three-dimensional grid-shaped reinforcing ribs are printed on each layer of the skeleton, which are covered with electrode materials, and a filling cavity is formed in the gaps of the reinforcing ribs;

[0090] S3, adhesive filling: after the reinforcement ribs are printed, the adhesive tube 6 is driven by the print head 2 to move, and the adhesive tube 6 sprays adhesive onto the inner wall of the filling cavity. The adhesive is made of polyacrylic acid powder, polyamide powder or polyacrylate powder, and the laser head 7 needs to be heated and printed at a temperature not lower than 106 degrees;

[0091] S4. Laying of spatial particles: After each layer of filling cavity is filled with adhesive, the additive tube 5 is driven by the print head 2 to move. The additive tube 5 sprays additives quantitatively into the filling cavity and solidifies the additives through the solidifying mechanism. The material of the additive is polystyrene powder, which needs to be heated and printed by the laser head 7 at a temperature not lower than 900 degrees. Spatial particles are printed in the filling cavity of each layer. When the additive tube 5 sprays polystyrene powder, nitrogen is transported to the cylinder 25 through the nitrogen tube 26. The nitrogen diffuses in the cylinder 25 and the flow rate is reduced. It is evenly dispersed to the outside of each guide plate 27 and flows out in a ring shape along the inner wall of the cylinder 25, so that the nitrogen forms an air wall to surround the polystyrene powder until the polystyrene powder is solidified by the light beam emitted by the print head 2. This can reduce the loss of the additive tube 5 into the air and reduce the harm caused to the air by the polystyrene powder during printing. Subsequently, the nitrogen is lost into the air and is harmless to the environment.

[0092] Finally, repeat the above operation to print the positive and negative electrodes of the lithium battery respectively. Conductive agent can be used to construct three-dimensional grid-shaped reinforcing ribs to strengthen the strength of the electrode skeleton. It can also facilitate the movement of electrons inside the skeleton along the reinforcing ribs. At the same time, the space particles in the filling cavity are wrapped with adhesive to increase the contact area between the electrode skeleton and the space particles, and to facilitate the distribution of the multi-layer array of space particles inside the skeleton. The staggered reinforcing ribs can further alleviate the stress inside the electrode, and the tensile strength and bending resistance of the electrode can be improved by polystyrene to reduce the number of electrodes being broken and bent.

[0093] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A digital manufacturing equipment for solid-state lithium battery electrodes, characterized in that: include: A printing platform (1), on which an external control system is arranged; A print head (2), the print head (2) being slidably mounted on the upper end of the printing platform (1), a water cooling mechanism being arranged on the outer side of the print head (2), and a curing mechanism being arranged on the lower end of the print head (2); An electrode material tube (3), the electrode material tube (3) being fixedly mounted at the lower end of the print head (2) and being used for ejecting the electrode material; A conductive agent tube (4), the conductive agent tube (4) being fixedly mounted at the lower end of the print head (2) and used for spraying the conductive agent; An additive tube (5), the additive tube (5) being fixedly mounted at the lower end of the print head (2) and used for spraying the additive, and a nitrogen protection mechanism being arranged on the outer side of the additive tube (5); An adhesive tube (6), the adhesive tube (6) being fixedly mounted at the lower end of the print head (2) and used for spraying adhesive; The nitrogen protection mechanism comprises: a cylinder (25), the cylinder (25) being fixedly mounted on the outside of the additive tube (5), and the cylinder (25) being structured such that one end away from the print head (2) is open; a nitrogen pipe (26), wherein the nitrogen pipe (26) is fixedly mounted on the inner wall of the cylinder (25), and one end of the nitrogen pipe (26) extends out of the interior of the cylinder (25); A guide plate (27), wherein a plurality of the guide plates (27) are distributed in a circumferential array on the inner wall of the cylinder (25), and the guide plates (27) are staggered with respect to the nitrogen pipe (26) in a horizontal direction.

2. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: The curing mechanism comprises: Laser heads (7), wherein the three laser heads (7) are fixedly mounted at the lower end of the print head (2) and are respectively aligned with the discharge port of the electrode material tube (3), the discharge port of the conductive agent tube (4) and the discharge port of the additive tube (5); Material sensors (8), wherein the three material sensors (8) are respectively fixedly mounted on the outside of the electrode material tube (3), the outside of the conductive agent tube (4), and the outside of the additive tube (5).

3. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: One end of the electrode material tube (3) passes through the print head (2) and is fixedly mounted with an electrode material pump (9); an electric valve a (10) is fixedly mounted at the feed port of the electrode material pump (9); and an electrode material box (11) is fixedly mounted at one end of the electric valve a (10) away from the electrode material pump (9).

4. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: One end of the conductive agent tube (4) passes through the print head (2) and is fixedly mounted with a conductive agent pump (12); an electric valve b (13) is fixedly mounted at the feed inlet of the conductive agent pump (12); and a conductive agent tank (14) is fixedly mounted at one end of the electric valve b (13) away from the conductive agent pump (12).

5. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: One end of the additive tube (5) passes through the print head (2) and is fixedly mounted with an additive pump (15); an electric valve c (16) is fixedly mounted at the feed inlet of the additive pump (15); and an additive tank (17) is fixedly mounted at one end of the electric valve c (16) away from the additive pump (15).

6. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: One end of the adhesive tube (6) passes through the print head (2) and is fixedly mounted with an adhesive pump (18); an electric valve d (19) is fixedly mounted at the feed inlet of the adhesive pump (18); and an adhesive box (20) is fixedly mounted at one end of the electric valve d (19) away from the adhesive pump (18).

7. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 2, characterized in that: The water cooling mechanism comprises: A water inlet pipe (21), the water inlet pipe (21) being fixedly mounted on the outside of the print head (2), and the outside of the water inlet pipe (21) being in contact with the outside of the laser head (7), and both ends of the water inlet pipe (21) being away from the print head (2); A water pump (22), wherein an output end of the water pump (22) is fixedly connected to one end of the water inlet pipe (21); A water tank (23), wherein a water inlet of the water tank (23) is fixedly connected to an end of the water inlet pipe (21) away from the water pump (22); A connecting pipe (24), one end of the connecting pipe (24) is fixedly connected to the water inlet end of the water pump (22), and the other end of the connecting pipe (24) extends into the interior of the water tank (23).

8. The digital manufacturing equipment for solid-state lithium battery electrodes according to claim 1, characterized in that: An electric valve e (28) is fixedly mounted on one end of the nitrogen pipe (26) extending out of the cylinder (25), a buffer tank (29) is fixedly mounted on one end of the electric valve e (28) away from the nitrogen pipe (26), a barometer (30) is fixedly mounted on the outside of the buffer tank (29), and an air inlet of the buffer tank (29) is connected to a nitrogen source.

9. A digital manufacturing method for solid-state lithium battery electrodes, characterized in that: A digital manufacturing equipment for a solid-state lithium battery electrode according to any one of claims 1 to 8, wherein the manufacturing method comprises the following steps: S1. Stacking skeleton: A digital skeleton model of a solid-state lithium battery electrode is constructed by a computer, and is imported into an external control system on a printing platform (1). The print head (2) is then controlled to move, driving the electrode material tube (3) to move to a specified position. The electrode material tube (3) ejects the electrode material, and the electrode material is solidified by a curing mechanism, and the skeleton of the solid-state lithium battery electrode is intermittently printed in layers; S2, inserting reinforcing ribs: in the gaps of the printed solid lithium battery electrode skeleton, the conductive agent tube (4) is driven to move by the printing head (2), the conductive agent tube (4) sprays out the conductive agent, and the conductive agent is cured by the curing mechanism, so that reinforcing ribs in the shape of a three-dimensional grid are printed on each layer of the skeleton, and a filling cavity is formed in the gaps of the reinforcing ribs; S3, adhesive filling: after the reinforcement ribs are printed, the adhesive tube (6) is driven to move by the printing head (2), and the adhesive tube (6) sprays adhesive onto the inner wall of the filling cavity; S4, spatial particle laying: after each layer of filling cavity is filled with adhesive, the additive tube (5) is driven by the printing head (2), the additive tube (5) sprays additive into the filling cavity in a quantitative manner, and the additive is cured by the curing mechanism, thereby printing spatial particles in the filling cavity of each layer.

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