Sodium-ion battery anode optimization and plating system

Abstract

The application relates to the field of plating technology, in particular to a sodium ion battery negative electrode optimization and plating system, which comprises a pretreatment device, a negative electrode material conveying device, a plating pool, an automatic cathode device, an anode, a power supply control system, a post-treatment device and a quality sampling detection system; the plating pool is provided with plating liquid; the automatic cathode device and the anode are arranged in the plating pool and are immersed in the plating liquid; and the automatic cathode device and the anode are powered and controlled through the power supply control system; the sodium ion battery negative electrode optimization and plating system can uniformly plate the negative electrode material of the sodium ion battery, optimizes the embedding and de-embedding process of sodium ions in the negative electrode, and reduces the performance attenuation of the battery.

Description

TECHNICAL FIELD

[0001] The application relates to the field of plating technology, in particular to a sodium-ion battery negative electrode optimization and a plating system thereof. BACKGROUND

[0002] The sodium-ion battery negative electrode optimization plating is a technology for coating or plating treatment on the surface of a negative electrode material of a sodium-ion battery, and the main purpose is to optimize the electrochemical performance of the negative electrode material. The negative electrode material of the sodium-ion battery is usually a carbon-based material such as hard carbon, soft carbon or other alloy materials. In the charging and discharging process, sodium ions will be embedded and extracted in the negative electrode material, which may cause the volume expansion and contraction of the material, and then affect the cycle stability and service life of the battery. By forming one or more coating or plating layers on the surface of the negative electrode material, the electrochemical performance of the material can be optimized. These plating layers are usually composed of metals, metal oxides, carbon-based materials or other compounds, which can chemically react with sodium ions, thereby changing the electrochemical behavior of the negative electrode material. However, when the uniformity of the negative electrode material plating is insufficient, the current density of some areas may be too high, and the current density of other areas may be too low, thereby affecting the overall discharge performance and cycle life of the battery. SUMMARY

[0003] The purpose of the present application is to provide a sodium-ion battery negative electrode optimization and a plating system thereof to solve the problems raised in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a sodium-ion battery negative electrode optimization and a plating system thereof, comprising a pretreatment device, a negative electrode material conveying device, a plating bath, an automatic cathode device, an anode, a power supply control system, a post-treatment device and a quality sampling detection system, a plating liquid is arranged in the plating bath, the automatic cathode device and the anode are arranged in the plating bath and immersed in the plating liquid, and the automatic cathode device and the anode are controlled by the power supply control system.

[0005] The negative electrode material to be plated is first treated by the pretreatment device, and then placed in the automatic cathode device by the negative electrode material conveying device for plating.

[0006] After plating is completed, the plated negative electrode material is placed in the post-treatment device by the negative electrode material conveying device, and after treatment by the post-treatment device, it is sent to the quality sampling detection system for quality detection.

[0007] The pretreatment device and the post-treatment device are respectively provided with cleaning devices and drying devices at the same time, the cleaning device in the pretreatment device is cleaned by using an organic solvent, an acid solution or an alkali solution, and the cleaning device in the post-treatment device is cleaned by using deionized water or ethanol.

[0008] The automatic cathode device comprises a cathode frame and a contact bump fixedly arranged at a position on the inner surface of the cathode frame, a suction groove is arranged in the contact bump, a suction flow channel is arranged on the surface of the contact bump and communicates with the suction groove, a mutual cavity pipe and a total cavity pipe are fixedly arranged on the surface of the cathode frame, the suction groove communicates with the total cavity pipe through the mutual cavity pipe, a fixed outer frame is arranged outside the cathode frame, a group track shaft is fixedly arranged in the fixed outer frame, a moving slider is fixedly arranged on the surface of the cathode frame, the group track shaft penetrates through the moving slider, an associated control mechanism is arranged inside and outside the fixed outer frame, and a circulating pump is arranged outside the fixed outer frame and communicates with the total cavity pipe through the associated control mechanism.

[0009] The associated control mechanism comprises a screw rod slider and a screw rod shaft, the screw rod slider is fixedly arranged on the surface of the cathode frame, the screw rod shaft is rotatably arranged on the fixed outer frame, the screw rod shaft penetrates through the screw rod slider and is screw-connected with the screw rod slider, a limiting ring is fixedly arranged on the outer surface of the screw rod shaft, and a worm gear disc is fixedly arranged at the end of the screw rod shaft.

[0010] A worm part is meshingly arranged outside the worm gear disc, a control power shaft is coaxially fixed on the worm part, a limiting support arm is sleeved and mounted on the outer surface of the control power shaft, and the limiting support arm is fixedly mounted with the fixed outer frame.

[0011] Control valve pipes are symmetrically arranged on the surface of the fixed outer frame, a plugging core column is movably arranged in the control valve pipe, and the plugging core column is in sliding sealing contact with the control valve pipe.

[0012] A limiting eave is fixedly arranged on the inner wall surface of the control valve pipe, the limiting eave is located on the side of the plugging core column facing the position of the screw rod slider, a control flange is fixedly arranged on the lower surface of the screw rod slider, and a state switching spring is connected between the control flange and the plugging core column.

[0013] An inner wall hole is arranged on the inner wall surface of the control valve pipe, when the state switching spring is compressed, the inner wall hole is blocked and closed by the plugging core column, and when the state switching spring is stretched, the inner wall hole is in an open state.

[0014] A connecting hose is communicatively arranged outside the inner wall hole, the other end of the connecting hose communicates with the total cavity pipe, a common pipeline is communicatively arranged between the ends of two groups of control valve pipes, a converging suction pipe is communicatively arranged on the common pipeline, and the converging suction pipe communicates with the circulating pump.

[0015] A connecting contact is arranged on the cathode frame, the connecting contact is connected with the cathode power supply line of the power supply control system, a clamping groove is arranged on the cathode frame, and a return pipe is communicatively arranged on the output port of the circulating pump.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] The sodium ion battery negative electrode optimization and plating system can uniformly plate the negative electrode material of the sodium ion battery, optimize the embedding and de-embedding process of sodium ions in the negative electrode, thereby reducing the performance degradation of the battery and improving the stability of the sodium ion battery during the cycle process.

[0018] The automatic cathode device is provided, which can automatically change the suction state of the contact protrusions during plating, so that the suction grooves in the contact protrusions at the two sides inside the cathode frame alternately adsorb the negative electrode material sheet at intervals, and the negative electrode material sheet changes the direction of sticking inside the cathode frame at intervals; so that the contact part of the negative electrode material sheet and the contact protrusion can also be uniformly plated, and by changing the contact part, the current distribution position is changed, the uniformity of plating is improved, and the performance of the sodium ion battery negative electrode is optimized. The adsorption flow grooves are provided, which can keep the plating liquid flowing through the adsorption flow grooves when the suction grooves adsorb the negative electrode material sheet, so that the plating liquid in the cathode frame is in a uniform flowing state, further improving the uniformity of plating.

[0019] The associated control mechanism is provided, which can drive the cathode frame to move back and forth along the axis direction of the group track shaft intermittently, and simultaneously control the negative pressure communication of the suction grooves at the two sides inside the cathode frame in association; when the cathode frame moves to one side, the liquid pressure acts on the surface of the negative electrode material sheet to push the negative electrode material sheet to move to the other side relative to the cathode frame, at this time the suction grooves at the other side are automatically opened under negative pressure, and the cooperation of the two can ensure that the negative electrode material sheet is in place in contact with the contact protrusions when changing the direction of sticking inside the cathode frame, and the cathode frame drives the negative electrode material sheet to move slightly, which can promote the flow of the plating liquid and ensure the uniformity of the plating liquid. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The system module diagram of the present application.

[0021] Figure 2 The structure schematic diagram of the automatic cathode device of the present application.

[0022] Figure 3 The Figure 2 The enlarged schematic diagram of area A.

[0023] Figure 4 The structure schematic diagram of the automatic cathode device of the present application from another angle.

[0024] Figure 5 The Figure 4 The enlarged schematic diagram of area B.

[0025] Figure 6Schematic diagram of the contact bump in the embodiment of the application.

[0026] Figure 7 Schematic diagram of the contact bump in the embodiment of the application. Figure 6 Schematic diagram of the contact bump in the embodiment of the application.

[0027] Figure 8 Schematic diagram of the contact bump in the embodiment of the application.

[0028] Figure 9 Schematic diagram of the contact bump in the embodiment of the application. Figure 8 Schematic diagram of the contact bump in the embodiment of the application.

[0029] Figure 10 Schematic diagram of the contact bump in the embodiment of the application.

[0030] Figure 11 Schematic diagram of the contact bump in the embodiment of the application. Figure 10 Schematic diagram of the contact bump in the embodiment of the application.

[0031] In the figure: 1, pre-treatment device; 2, negative material carrying device; 3, plating pool; 4, automatic cathode device; 5, anode; 6, power supply control system; 7, post-treatment device; 8, quality sampling detection system; 41, cathode frame; 42, contact bump; 43, suction groove; 44, adsorption flow-through groove; 45, intercommunication cavity pipe; 46, total road cavity pipe; 47, fixed outer frame; 48, group track shaft; 49, moving sliding block; 410, circulating pump; 4701, screw rod sliding block; 4702, screw rod shaft; 4703, limiting ring; 4704, worm gear disc; 4705, worm part; 4706, control power shaft; 4707, limiting support arm; 4708, control valve pipe; 4709, plugging core column; 4710, limiting eave; 4711, state switching spring; 4712, control pendant; 4713, inner wall hole; 4714, connecting hose; 4715, common pipeline; 4716, confluence suction pipe; 4101, on-touch point; 4102, clamping groove; 411, backflow pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0033] Please refer to Figures 1 to 11The application provides a technical scheme: a sodium ion battery negative electrode optimization and plating system, which comprises pretreatment equipment 1, negative electrode material conveying device 2, plating pool 3, automatic cathode device 4, anode 5, power supply control system 6, post-treatment equipment 7 and quality sampling detection system 8, the plating pool 3 is provided with plating liquid, the plating pool 3 is made of corrosion-resistant and high-temperature-resistant material to ensure stability in a long-time and high-temperature working environment, the automatic cathode device 4 and the anode 5 are both arranged in the plating pool 3 and immersed in the plating liquid, the automatic cathode device 4 and the anode 5 are controlled in power supply by the power supply control system 6, the power supply control system 6 is responsible for providing the current and voltage required for plating, and the power supply control system 6 can accurately adjust the current, voltage and plating time and the like to meet different plating requirements.

[0034] The negative electrode material to be plated is first treated by the pretreatment equipment 1 and then placed into the automatic cathode device 4 by the negative electrode material conveying device 2 for plating, and the negative electrode material conveying device 2 comprises a conveying belt and a mechanical gripper.

[0035] After plating, the plated negative electrode material is placed into the post-treatment equipment 7 by the negative electrode material conveying device 2, and after treatment by the post-treatment equipment 7, the plated negative electrode material is sent into the quality sampling detection system 8 for quality detection, the quality sampling detection system 8 extracts part of samples, and the morphology and structure of the plated layer are observed by using a scanning electron microscope (SEM), a transmission electron microscope (TEM) and the like; the composition and crystal structure of the plated layer are analyzed by using an energy spectrometer (EDS), an X-ray diffraction (XRD) and the like.

[0036] The pretreatment equipment 1 and the post-treatment equipment 7 are both provided with cleaning devices and drying devices, the cleaning device in the pretreatment equipment 1 is cleaned by using an organic solvent, an acid solution or an alkali solution; and the cleaning device in the post-treatment equipment 7 is cleaned by using deionized water or ethanol.

[0037] The negative electrode material is first cleaned by using an organic solvent, an acid solution or an alkali solution in the pretreatment equipment 1 to remove impurities and oil stains on the surface of the material, and then dried to ensure that the surface is dry and free of moisture; the negative electrode material is placed into the automatic cathode device 4 by the negative electrode material conveying device 2 for plating, and during plating, the negative electrode material serves as a cathode and is immersed in an electrolyte containing plating material ions, and current is applied to make the ions reduced into metal or alloy on the surface of the negative electrode material to form a plated layer.

[0038] The automatic cathode device 4 comprises a cathode frame 41 and a contact bump 42 fixedly arranged at a position of an inner side surface of the cathode frame 41, a suction groove 43 is arranged in the contact bump 42, a suction flow channel 44 is arranged on a surface of the contact bump 42 and communicates with the suction groove 43, a mutual cavity pipe 45 and a total cavity pipe 46 are fixedly arranged on a surface of the cathode frame 41, the suction groove 43 communicates with the total cavity pipe 46 through the mutual cavity pipe 45, a fixed outer frame 47 is arranged outside the cathode frame 41, a group track shaft 48 is fixedly arranged in the fixed outer frame 47, a moving slider 49 is fixedly arranged on a surface of the cathode frame 41, the group track shaft 48 penetrates through the moving slider 49, an associated control mechanism is arranged on an inner and outer part of the fixed outer frame 47, a circulating pump 410 is arranged outside the fixed outer frame 47, the circulating pump 410 communicates with the total cavity pipe 46 through the associated control mechanism, when the circulating pump 410 is arranged inside the plating pool 3, the circulating pump 410 needs to have waterproof performance, when the circulating pump 410 is arranged outside the plating pool 3, waterproof performance is not required.

[0039] The associated control mechanism comprises a screw rod slider 4701 and a screw rod shaft 4702, the screw rod slider 4701 is fixedly arranged on a surface of the cathode frame 41, the screw rod shaft 4702 is rotatably arranged on the fixed outer frame 47, the screw rod shaft 4702 penetrates through the screw rod slider 4701 and is screw-connected with the screw rod slider 4701, a limiting ring 4703 is fixedly arranged on an outer surface of the screw rod shaft 4702, and a worm gear disc 4704 is fixedly arranged at an end of the screw rod shaft 4702.

[0040] A worm part 4705 is meshingly arranged outside the worm gear disc 4704, a control power shaft 4706 is coaxially fixed on the worm part 4705, a limiting support arm 4707 is sleeved and mounted on an outer part of the control power shaft 4706, and the limiting support arm 4707 is fixedly mounted on the fixed outer frame 47.

[0041] The control valve pipe 4708 is symmetrically arranged on a surface of the fixed outer frame 47, a plugging core column 4709 is movably arranged in the control valve pipe 4708, and the plugging core column 4709 is in sliding sealing contact with the control valve pipe 4708.

[0042] A limiting eave 4710 is fixedly arranged on an inner wall surface of the control valve pipe 4708, the limiting eave 4710 is located on a side of the plugging core column 4709 facing a position of the screw rod slider 4701, a control flange 4712 is fixedly arranged on a lower surface of the screw rod slider 4701, and a state switching spring 4711 is connected between the control flange 4712 and the plugging core column 4709, as shown in FIG. Figure 9 When the control flange 4712 moves to a middle position of the fixed outer frame 47, the state switching springs 4711 on both sides are in a state of neither being stretched nor being compressed.

[0043] The inner wall surface of the control valve tube 4708 is provided with an inner wall hole 4713. When the state switching spring 4711 is compressed, the inner wall hole 4713 is blocked and closed by the sealing core 4709. When the state switching spring 4711 is stretched, the inner wall hole 4713 is in the open state.

[0044] The inner wall hole 4713 is externally connected to a connecting hose 4714, the other end of which is connected to the main cavity pipe 46. A common pipe 4715 is connected between the ends of the two sets of control valve pipes 4708. A converging suction pipe 4716 is connected to the common pipe 4715, and the converging suction pipe 4716 is connected to the circulating pump 410.

[0045] The cathode frame 41 is provided with a contact 4101, which is connected to the cathode power supply line of the power control system 6. The contact 4101, the cathode frame 41, and the contact protrusion 42 are all made of conductive material. The lead screw slider 4701, the fixed outer frame 47 and other structures are made of insulating material to prevent the lead screw shaft 4702 from being electroplated and affecting the performance of the lead screw shaft 4702.

[0046] The cathode frame 41 is provided with a clamping slot 4102. The clamping slot 4102 is the clamping part of the mechanical gripper when the negative electrode material handling device 2 clamps or places the negative electrode material sheet. The output port of the circulating pump 410 is connected to a return pipe 411. The return pipe 411 returns to other areas in the plating tank 3, which can promote the flow of plating solution in the plating tank 3.

[0047] When in use, the automatic cathode device 4 of the present invention can be arranged in parallel in the plating tank 3. The group track shaft 48 is used to support and fix the automatic cathode device 4. Multiple automatic cathode devices 4 can be connected and fixed together through the group track shaft 48. The contact point 4101 is connected to the cathode power supply line of the power control system 6. The control power shaft 4706 is connected to an external motor or transmission pulley, which can drive the control power shaft 4706 to rotate.

[0048] The negative electrode material handling device 2 picks up the negative electrode material sheet and places it into the cathode frame 41. The power control system 6 supplies power for plating. At this time, the circulating pump 410 runs, generating negative pressure to draw out the plating solution. The negative pressure sequentially passes through the converging suction pipe 4716 and the common pipe 4715 into the control valve pipe 4708. Figure 9 As shown, with Figure 9As shown in the example, the inner wall hole 4713 of the control valve pipe 4708 located on the left side is open, while the inner wall hole 4713 of the control valve pipe 4708 located on the right side is blocked by the sealing core 4709 inside. Therefore, the negative pressure is connected to the suction tank 43 through the connecting hose 4714, the main cavity pipe 46, and the interconnecting cavity pipe 45 in sequence. At this time, inside the cathode frame 41, only the suction tank 43 on one side is drawing plating solution, while the suction tank 43 on the other side is closed. The negative electrode material sheet is drawn onto the contact protrusion 42 and makes conductive contact with the contact protrusion 42.

[0049] like Figure 3 As shown, the control power shaft 4706 rotates, which drives the worm gear part 4705 to rotate. The worm gear part 4705 drives the worm wheel 4704 to rotate through meshing, causing the lead screw shaft 4702 to rotate. At this time, the lead screw slider 4701 will be driven to move.

[0050] like Figure 9 As shown, when the lead screw slider 4701 moves to the left, the cathode frame 41 is first moved to the left, and the negative electrode material sheet inside the cathode frame 41 is subjected to liquid thrust from the left. Simultaneously, the control tongue 4712 moves to the left. At this time, the state switching spring 4711 on the left side of the control tongue 4712 is gradually compressed, and the state switching spring 4711 on the right side of the control tongue 4712 is gradually stretched. When the state switching spring 4711 deforms to a certain extent, the state switching spring 4711 on the left begins to apply thrust, and the state switching spring 4711 on the right begins to apply tension. This causes the sealing core 4709 in the left control valve tube 4708 to close the inner wall hole 4713, while the sealing core 4709 in the right control valve tube 4708 opens the inner wall hole 4713. The suction grooves 43 on both sides change their switching states, and... Figure 9 and attached Figure 10 From the perspective of the cathode frame 41, the suction groove 43 located on the right side is open; on the one hand, the negative electrode material sheet will be pushed by the liquid from the left side, and on the other hand, the negative pressure of the suction groove 43 on the right side will attract it, which can ensure that the negative electrode material sheet makes contact with the contact protrusion 42 when it changes the bonding direction inside the cathode frame 41, and at the same time complete the alternating opening control of the suction grooves 43 on both sides.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sodium-ion battery negative electrode optimization and coating system, comprising a pretreatment device (1), a negative electrode material handling device (2), a coating tank (3), an automatic cathode device (4), an anode (5), a power control system (6), a post-treatment device (7), and a quality sampling and inspection system (8), characterized in that: The plating tank (3) is provided with plating solution. The automatic cathode device (4) and anode (5) are both provided in the plating tank (3) and immersed in the above-mentioned plating solution. The automatic cathode device (4) and anode (5) are powered and controlled by the power control system (6). The negative electrode material to be plated is first processed by the pretreatment equipment (1), and then placed into the automatic cathode device (4) by the negative electrode material handling device (2) for plating; After the plating is completed, the plated negative electrode material is placed into the post-processing equipment (7) through the negative electrode material handling device (2). After being processed by the post-processing equipment (7), it is sent to the quality sampling and testing system (8) to complete the quality testing. The automatic cathode device (4) includes a cathode frame (41) and contact protrusions (42) fixedly disposed on the inner surface of the cathode frame (41). A suction groove (43) is formed in the contact protrusions (42). An interconnecting cavity (45) and a main cavity (46) are fixedly disposed on the surface of the cathode frame (41). The suction groove (43) is connected to the main cavity (46) through the interconnecting cavity (45). A fixed outer frame (47) is disposed outside the cathode frame (41). An associated control mechanism is disposed inside and outside the fixed outer frame (47). An external circulating pump (410) is provided, which is connected to the main pipeline (46) via an associated control mechanism; the associated control mechanism includes a lead screw slider (4701) and a lead screw shaft (4702). The lead screw slider (4701) is fixedly provided on the surface of the cathode frame (41), and the lead screw shaft (4702) is rotatably provided on the fixed outer frame (47). The lead screw shaft (4702) passes through the lead screw slider (4701) and is screwed to it; control valve pipes (4708) are symmetrically provided on the surface of the fixed outer frame (47). A sealing core (4709) is movably disposed in the valve tube (4708), and the sealing core (4709) has a sliding sealing contact with the control valve tube (4708); a control latch (4712) is fixedly disposed on the lower surface of the lead screw slider (4701), and a state switching spring (4711) is connected between the control latch (4712) and the sealing core (4709); an inner wall hole (4713) is opened on the inner wall surface of the control valve tube (4708), and when the state switching spring (4711) is compressed, the inner wall hole (4713) is blocked. The core column (4709) is blocked and closed. When the state switching spring (4711) is stretched, the inner wall hole (4713) is in the open state. The inner wall hole (4713) is externally connected to a connecting hose (4714). The other end of the connecting hose (4714) is connected to the main channel pipe (46). A common pipeline (4715) is connected between the ends of the two sets of control valve pipes (4708). A converging suction pipe (4716) is connected to the common pipeline (4715). The converging suction pipe (4716) is connected to the circulating pump (410).

2. The sodium-ion battery negative electrode optimization and coating system according to claim 1, characterized in that: The pretreatment equipment (1) and the posttreatment equipment (7) are respectively equipped with a cleaning device and a drying device. The cleaning device in the pretreatment equipment (1) uses organic solvents, acid solutions or alkaline solutions for cleaning; the cleaning device in the posttreatment equipment (7) uses deionized water or ethanol for cleaning.

3. The sodium-ion battery negative electrode optimization and coating system according to claim 1, characterized in that: The surface of the contact protrusion (42) is provided with an adsorption flow groove (44) that communicates with the suction groove (43). A group track shaft (48) is fixedly installed in the fixed outer frame (47). A movable slider (49) is fixedly installed on the surface of the cathode frame (41). The group track shaft (48) passes through the movable slider (49).

4. The sodium-ion battery negative electrode optimization and coating system according to claim 3, characterized in that: A limit ring (4703) is fixedly provided on the outer surface of the lead screw shaft (4702), and a worm gear disk (4704) is fixedly provided at the end of the lead screw shaft (4702).

5. The sodium-ion battery negative electrode optimization and coating system according to claim 4, characterized in that: The worm gear disk (4704) is externally meshed with a worm portion (4705), and a control power shaft (4706) is coaxially fixed on the worm portion (4705). A limit arm (4707) is sleeved on the outside of the control power shaft (4706), and the limit arm (4707) is fixedly installed with the fixed outer frame (47).

6. The sodium-ion battery negative electrode optimization and coating system according to claim 5, characterized in that: The inner wall surface of the control valve tube (4708) is fixedly provided with a limiting eave (4710), which is located on the side of the sealing core column (4709) facing the screw slider (4701).

7. The sodium-ion battery negative electrode optimization and coating system according to claim 3, characterized in that: The cathode frame (41) is provided with a contact (4101), which is connected to the cathode power supply line of the power control system (6). The cathode frame (41) is provided with a clamping slot (4102), and the output port of the circulating pump (410) is connected to a return pipe (411).

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