A system for supplementing metallic elements

Abstract

The present application discloses a system for supplementing metal elements. The positive electrode, negative electrode, and separator serving as metal element sources are wound into a cylindrical core after being infiltrated by an electrolyte infiltration roller. The surface of the infiltration roller is coated with an elastic film, which elastically squeezes and contacts the surface of the electrode sheet of the cylindrical core, without causing indentation and extension on the surface of the electrode sheet; the electrolyte overflows through the first and second liquid seepage holes to achieve uniform coating of the electrolyte; the cylindrical core is connected to a charging power supply cabinet for charging to complete the supplementation of metal elements to the negative electrode. This winding structure can achieve batch and continuous supplementation of metals. After the cylindrical core is unwound, it is dried in a drying box to ensure that the substances on the surface of the electrode sheet do not fall off during continued use. The negative electrode after supplementing metal elements can be normally put into production after rewinding, and the separator and positive electrode can be reused for the next supplementation of metal elements to the negative electrode after rewinding, and the repeated use stops until the charging voltage of the last time reaches the charging cut-off voltage of the positive electrode material.

Description

Technical Field

[0001] This application relates to the field of secondary metal ion battery applications, and particularly to a system for supplementing metal elements. Background Art

[0002] Power secondary metal ion batteries have currently been maturely applied in fields such as electric tricycles, electric vehicles, and home energy storage. However, their cruising range has become a pain point and a difficult problem in the entire industry at present. Taking lithium-ion batteries as an example, when lithium-ion batteries are charged for the first time, an SEI film is formed along with the consumption of lithium ions, reducing the effective capacity of the lithium-ion batteries. To solve the problem of lithium consumption during the first charge of lithium ions, various lithium supplementation methods have emerged. There are mainly three ways of supplementing lithium at the negative electrode: 1. Adding lithium powder when preparing the slurry, and coating it on the current collector after traditional stirring; 2. Compounding a lithium strip onto the electrode plate through a rolling mechanism; 3. Sprinkling dispersed lithium powder particles on the negative electrode plate and then performing re-rolling.

[0003] However, the above-mentioned lithium supplementation methods have many defects. The method of compounding a lithium strip onto the electrode plate through rolling requires strict control of the electrode plate thickness and has high requirements for rolling accuracy; the method of sprinkling lithium powder on the electrode plate has high requirements for the particle size of the lithium powder and the uniformity and stability of powder sprinkling; the most serious problem is that lithium sheets and lithium powder are very reactive and are extremely likely to cause safety hazards such as fire and explosion, which is also the core problem why the lithium supplementation process has not been applied in large quantities so far. And there are mainly two ways of supplementing lithium at the positive electrode. One is to add a small amount of lithium oxide to the positive electrode system; the other is to add an excessive amount of lithium element during the synthesis process of the positive electrode material; the purpose is to store excessive lithium in the positive electrode material and use the excessive lithium to supplement the lithium element consumed by the negative electrode during the first charge of the lithium-ion battery, improving the first charge efficiency, and further improving the cycle performance of the lithium-ion battery. However, the actual operation is relatively complex and the technical difficulty is relatively high. Secondary metal ion batteries, including but not limited to lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, calcium-ion batteries, magnesium-ion batteries, aluminum-ion batteries, zinc-ion batteries, etc., all have problems similar to those of lithium-ion batteries. Summary of the Invention

[0004] This application provides a system for supplementing metal elements, which solves the problems of complex process and high technical difficulty in supplementing metal elements to batteries in the prior art.

[0005] To solve the above technical problems, a system for supplementing metal elements provided by this application includes:

[0006] A winding machine, on one side of the discharge end of the winding machine, there is a cylindrical core placement device, which is electrically connected to a charging device, and on one side of the cylindrical core placement device, there is an unwinding machine;

[0007] The winding machine includes wetting rollers, which are arranged in pairs, and a pair of the wetting rollers are attached to both sides of the cylindrical core battery electrode sheet. The wetting rollers are of a hollow structure, and a liquid inlet communicating with an external electrolyte transportation pipeline is provided at one end of the wetting rollers. A plurality of first liquid seepage holes are provided on the outer surface circumference of the wetting rollers, and an elastic film is wrapped around the outer surface of the wetting rollers. Second liquid seepage holes corresponding to each of the first liquid seepage holes are provided on the elastic film;

[0008] The cylindrical core placing device includes a placing base, a first placing groove is provided on the placing base, a notch is provided at a position of the placing base close to the first placing groove, a top cover body is clamped on the placing base, a second placing groove corresponding to the first placing groove is provided on the top cover body, and a cylindrical core with a positive end cover plate and a negative end cover plate respectively buckled at both ends is located in a placing space formed by the first placing groove and the second placing groove, and the core shafts at both ends of the cylindrical core are located at the notch;

[0009] The charging device includes a charging power supply cabinet, and the charging power supply cabinet is connected to both the positive end cover plate and the negative end cover plate;

[0010] The unwinding machine includes a drying box body located at the front end of the second process rectifying mechanism, and the electrode sheet and the separator on the cylindrical core penetrate through the drying box body.

[0011] Preferably, an annular sealing ring is further provided at the connection between the placing base and the top cover body.

[0012] Preferably, a negative pressure port communicating with the second placing groove is further provided on the top side of the top cover body, a hose is connected to the top cover body through the negative pressure port, and the other end of the hose is connected to an air extraction mechanism.

[0013] Preferably, a plurality of uniformly distributed strip-shaped connecting pieces are further provided on the surfaces of both the positive end cover plate and the negative end cover plate, and each of the strip-shaped connecting pieces is in extrusion contact with the electrode of the cylindrical core.

[0014] Preferably, the positive terminal of the charging power supply cabinet is electrically connected to the positive end cover plate through a positive lead wire, and the negative terminal of the charging power supply cabinet is electrically connected to the negative end cover plate through a negative lead wire.

[0015] Preferably, lead wire round holes are provided on both the positive end cover plate and the negative end cover plate, and the positive lead wire and the negative lead wire are respectively inserted into the corresponding lead wire round holes.

[0016] Preferably, each of the first liquid seepage holes is uniformly distributed on the outer surface circumference of the wetting roller.

[0017] As can be seen from the above technical solutions, for a system for supplementing metal elements provided by this application, the operating environment needs to be under an environment where the dew point is lower than -30°C; an elastic film is wrapped on the surface of the infiltration roller, and it elastically squeezes and contacts the surface of the electrode sheet of the cylindrical core, which will not cause quality problems such as indentation and extension on the surface of the electrode sheet, and the accuracy requirements for the infiltration roller are not very high; the electrolyte overflows through the first liquid seepage holes and the second liquid seepage holes to achieve electrolyte coating and infiltration, which can effectively ensure uniform infiltration of the electrode sheet and will not overflow to affect the exposed white area of the electrode sheet, and this winding structure can achieve batch continuous supplementation of metal elements. Connecting the cylindrical core to the charging power supply cabinet can charge the cylindrical core, thereby completing the electrochemical supplementation process. After the cylindrical core is unwound, it passes through a drying box for drying to ensure that the substances on the surface of the electrode sheet do not fall off during continued use. After the negative electrode after supplementing metal elements is rewound, it can be normally put into production use, and the separator and the positive electrode can be recycled for the next metal element supplementation after being rewound. The positive electrode, as the metal source electrode, can be reused until the charging voltage of the last time reaches the charging cut-off voltage of the positive electrode material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of this application, the attached drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0019] Figure 1 Structural schematic diagram of a system for supplementing metal elements provided by an embodiment of the present invention;

[0020] Figure 2 Structural schematic diagram of the alignment degree of the electrode sheet and the separator of a cylindrical core battery provided by an embodiment of the present invention;

[0021] Figure 3 Structural schematic diagram of a winding machine provided by an embodiment of the present invention;

[0022] Figure 4 Structural schematic diagram of an infiltration roller provided by an embodiment of the present invention;

[0023] Figure 5 Structural schematic diagram of an elastic film provided by an embodiment of the present invention;

[0024] Figure 6 Structural schematic diagram of the connection between a cylindrical core placement device, a charging device, and an air extraction mechanism provided by an embodiment of the present invention;

[0025] Figure 7 Cross-sectional view of a cylindrical core placement device provided by an embodiment of the present invention;

[0026] Figure 8Schematic diagram of a positive end cover plate or negative end cover plate structure provided by an embodiment of the present invention;

[0027] Figure 9 Schematic diagram of a unwinding machine structure provided by an embodiment of the present invention.

[0028] In the figure: 01, winding machine; 02, cylindrical core placing device; 03, charging device; 04, unwinding machine; 5, negative electrode unwinding mechanism; 6, 2# separator unwinding mechanism; 7, positive electrode unwinding mechanism; 8, 1# separator unwinding mechanism; 9, servo deviation rectifying mechanism; 10, tension control mechanism; 11, first process deviation rectifying mechanism; 12, first driving and traction mechanism; 13, wetting roller; 14, electrolyte storage device; 15, electrolyte outlet; 16, liquid control valve; 17, cutting mechanism; 18, blowing device; 19, gluing mechanism; 20, cylindrical core; 21, core shaft; 22, liquid inlet; 23, first liquid seepage hole; 24, elastic membrane; 25, second liquid seepage hole; 26, placing base; 260, first placing groove; 27, top cover body; 270, second placing groove; 28, annular sealing ring; 29, notch; 30, positive end cover plate; 31, negative end cover plate; 32, positive electrode lead; 33, negative electrode lead; 34, charging power supply cabinet; 35, positive terminal; 36, negative terminal; 37, negative pressure port; 370, hose; 38, air extraction mechanism; 40, strip connecting piece; 41, lead round hole; 42, drying box body; 43, second process deviation rectifying mechanism; 44, tension control mechanism; 45, second driving and traction mechanism; 46, positive electrode rewinding mechanism; 47, servo deviation rectifying mechanism; 48, 1# separator rewinding mechanism; 49, negative electrode rewinding mechanism; 50, 2# separator rewinding mechanism; 1-1, negative extreme; 4-1, first negative electrode exposed white area; 3-1, first separator area; 2-1, first positive electrode exposed white area; 1-2, positive extreme; 2-2, second positive electrode exposed white area; 3-2, second separator area; 4-2, second negative electrode exposed white area. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0030] The core of this application is to provide a system for supplementing metal elements, which can solve the problems of complex process and high technical difficulty in supplementing metal elements to batteries in the prior art.

[0031] Figure 1 Schematic diagram of a system structure for supplementing metal elements provided by an embodiment of the present invention, Figure 2 Schematic diagram of the alignment degree of a cylindrical core battery electrode and separator provided by an embodiment of the present invention, Figure 3Schematic diagram of a winding machine structure provided by an embodiment of the present invention Figure 4 Schematic diagram of an infiltration roller structure provided by an embodiment of the present invention Figure 5 Schematic diagram of an elastic film structure provided by an embodiment of the present invention Figure 6 Schematic diagram of the connection structure of a cylindrical core placement device, a charging device, and an air extraction mechanism provided by an embodiment of the present invention Figure 7 Cross-sectional view of a cylindrical core placement device provided by an embodiment of the present invention Figure 8 Schematic diagram of a positive end cover plate or a negative end cover plate structure provided by an embodiment of the present invention Figure 9 Schematic diagram of an unwinding machine structure provided by an embodiment of the present invention

[0032] Example 1 (illustrated by taking the lithium supplementation of the battery negative electrode as an example)

[0033] As Figures 1 to 8 shown, a system for supplementing metal elements includes:

[0034] A winding machine 01, on one side of the discharge end of the winding machine 01, there is a cylindrical core placement device 02, the cylindrical core placement device 02 is electrically connected to a charging device 03, and on one side of the cylindrical core placement device 02, there is an unwinding machine 04; the winding machine 01 is mainly used to realize the coating of the positive and negative electrodes and the electrolyte on the surface of the separator of the cylindrical core 20, and complete the production of the cylindrical core 20 through the winding form. In this embodiment, the cylindrical cores 20 mentioned are all large-diameter full-pole-ear cylindrical cores.

[0035] Figure 3 In [reference], 8 is the 1# separator unwinding mechanism, 5 is the negative electrode unwinding mechanism, 6 is the 2# separator unwinding mechanism, and 7 is the positive electrode unwinding mechanism; when the negative electrode unwinding mechanism 5 unwinds the electrode sheet, the tension is controlled and adjusted by six tension rollers at the tension control mechanism 10 during the electrode sheet running. When the electrode sheet runs, the first process deviation correction mechanism 11 monitors the edge position of the electrode sheet in real time, and feeds back the detected displacement deviation amount of the electrode sheet to the servo deviation correction mechanism 9 in real time to realize the deviation correction during the electrode sheet running. When the electrode sheet runs, the first driving and traction mechanism 12 realizes the traction and conveying. When the electrode sheet runs, the infiltration roller 13 realizes the extrusion and coating of the electrolyte on the front and back surfaces of the electrode sheet. The infiltration roller 13 is connected to the electrolyte outlet 15 of the electrolyte storage device 14 through a corrosion-resistant hose, and is provided with a liquid control valve 16 to control the liquid flow rate, flow rate, etc. during the electrolyte coating; the functions and principles of the positive electrode and the separator are similar to those of the negative electrode; after the electrode sheet and the separator are stably corrected in the process deviation, the cutting knife mechanism 17 is used to cut the electrode sheet and the separator, and then they are sequentially pulled by their respective driving and traction mechanisms for a certain distance. Then, the blowing device 18 uses positive-pressure blowing to make the cut electrode sheet closely adhere to the core shaft 21. The taping mechanism 19 cuts a single-layer adhesive tape to realize the firm bonding of the electrode sheet, the separator, and the core shaft 21 through the tape in sequence, and finally completes the main winding of the large-diameter cylindrical core 20.

[0036] The wetting rollers 13 are arranged in pairs. When in use, a pair of wetting rollers 13 are attached to both sides of the cylindrical core battery electrode sheet. The wetting rollers 13 are hollow, and a liquid inlet 22 communicating with an external electrolyte transportation pipeline is provided at one end of the wetting roller 13. A plurality of first liquid seepage holes 23 are arranged on the outer circumferential surface of the wetting roller 13. Preferably, the first liquid seepage holes 23 are evenly distributed on the outer circumferential surface of the wetting roller 13. An elastic film 24 is wrapped around the outer surface of the wetting roller 13, and second liquid seepage holes 25 are provided on the elastic film 24. The density of the second liquid seepage holes 25 is greater than that of the first liquid seepage holes 23, and the size of the second liquid seepage holes 25 is smaller than that of the first liquid seepage holes 23. The elastic film 24 is provided on the surface of the wetting roller 13 and is in elastic extrusion contact with the surface of the electrode sheet, which will not cause quality problems such as indentation and extension on the surface of the electrode sheet, and the accuracy requirement for the wetting roller 13 is not very high. The electrolyte overflows through the first liquid seepage holes 23 and the second liquid seepage holes 25 to achieve electrolyte coating and wetting, which can effectively ensure uniform wetting of the electrode sheet and will not overflow to affect the exposed white area of the electrode sheet, and this winding structure can achieve batch continuous lithium supplementation.

[0037] The cylindrical core placing device 02 mainly includes a placing base 26 and a top cover body 27. The placing base 26 and the top cover body 27 are snap-connected. A first placing groove 260 is provided on the placing base 26, and a second placing groove 270 is provided on the top cover body 27. The second placing groove 270 corresponds to the first placing groove 260. After installation, the first placing groove 260 and the second placing groove 270 can form a placing space. A notch 29 is provided at a position on the placing base 26 close to the first placing groove 260. When in use, the core shafts 21 at both ends of the cylindrical core 20 are located on the two notches 29, that is, the cylindrical core 20 is located in the placing space. A positive end cover plate 30 and a negative end cover plate 31 are respectively buckled at both ends of the cylindrical core 20.

[0038] The charging device 03 mainly consists of a charging power supply cabinet 34, a positive lead 32, and a negative terminal 36. During use, the charging power supply cabinet 34 can be set at a suitable position close to the cylindrical core placing device 02. One end of the positive lead 32 is connected to the positive terminal 35 of the charging power supply cabinet 34, and the other end of the positive lead 32 passes through the top cover body 27 and is electrically connected to the positive end cover plate 30. One end of the negative lead 33 is connected to the negative terminal 36 of the charging power supply cabinet 34, and the other end of the negative lead 33 passes through the top cover body 27 and is electrically connected to the negative end cover plate 31. Then, the cylindrical core 20 is charged through the charging power supply cabinet 34. At a certain current i and a certain time t, a certain amount of charge i*t in ampere-hours is charged into the cylindrical core 20, and the voltage of the lithium source positive electrode is calibrated as the monitoring starting voltage for the control parameters of the lithium source positive electrode for repeated use next time. After the charging process is completed, it indicates that the negative electrode has received the lithium from the lithium source positive electrode and completed the electrochemical lithium supplementation process.

[0039] A drying box body 42 is added to the front end of the second process deviation rectifying mechanism 43 of the unwinding machine 04. The structure and working principle of the drying box body 42 can refer to the prior art. After the end glue of the cylindrical core 20 is removed, unwinding starts. The electrode sheets and the separator on the cylindrical core 20 are located in the drying box body 42. After being dried by the drying box body 42, the second process deviation rectifying mechanism 43 monitors the edge position of the electrode sheet in real time and feeds back the detected displacement offset of the electrode sheet edge to the servo deviation rectifying mechanism 47 in real time to achieve the process deviation rectification of the electrode sheet. The six tension rollers at the tension control mechanism 44 are used for tension control adjustment. Finally, the electrode sheet after unwinding is traction-transported to the positive electrode rewinding mechanism 46 by the second driving traction mechanism 45 to complete the separate rewinding of the positive electrode. The 1# separator rewinding mechanism 48, the negative electrode rewinding mechanism 49, and the 2# separator rewinding mechanism 50 are the same as the positive electrode rewinding mechanism 46 and have a similar principle. The solvent on the electrode sheet can be removed through the drying box body 42 to ensure that the surface substances do not fall off during continued use.

[0040] For the negative electrode lithium supplementation in the present invention, the positive electrode serves as the lithium source electrode. The positive electrode material should preferably be a material with rich raw materials, low price, environmental friendliness, and good safety. Generally, lithium iron phosphate, lithium manganate, and lithium-rich materials such as lithium-rich compounds, nano-composite materials based on conversion reactions, and binary lithium compounds are selected. The lithium supplementation environment needs to be carried out in an environment with a dew point lower than -30°C. To ensure uniform lithium supplementation of the negative electrode, the width of the positive electrode material coating area should completely cover the negative electrode material coating area. For easy control, generally, each side should extend more than 1 mm. Figure 2As shown, negative terminal 1-1: The exposed white area 4-1 of the first negative electrode extends beyond the first separator area 3-1 by a certain distance, and the first separator area 3-1 extends beyond the exposed white area 2-1 of the first positive electrode by a certain distance; positive terminal 1-2: The exposed white area 2-2 of the second positive electrode extends beyond the second separator area 3-2 by a certain distance, and the second separator area 3-2 extends beyond the exposed white area 4-2 of the second negative electrode by a certain distance. Use a winding machine 01 to unwind 1 positive electrode roll A1, 1 negative electrode roll B1, and 2 separator rolls C1 simultaneously. The first driving and traction mechanism 12 traction the electrode sheets and the separators through their respective corresponding infiltration rollers 13, and finally wind out a large-diameter full-tab cylindrical core; Place the cylindrical core 20 in a sealed cylindrical core placement device 02. Then connect the positive terminal 35 of the external charging power supply cabinet 34 to the positive terminal cover plate 30 through the positive electrode lead 32, and connect the negative terminal 36 of the external charging power supply cabinet 34 to the negative terminal cover plate 31 through the negative electrode lead 33; Set the charging current, charging time, and the corresponding amount of electricity, start the charging power supply in the charging power supply cabinet 34, and complete the lithium element supplementation for the negative electrode; Use the unwinding mechanism 04 to unwind the lithium-supplemented cylindrical core 20 and dry it in the drying box body 42, and then wind out 1 positive electrode roll A2, 1 negative electrode roll B2, and 2 separator rolls C2 respectively; The negative electrode roll B2 is used for conventional battery production; The positive electrode roll A2 can be reused, and the number of times it can be used can be determined according to the amount of lithium element supplemented for the negative electrode, the surface density of the positive electrode, the solid content of the active material, and the utilization rate, etc.; The 2 separator rolls C2 can be reused and are used together with the positive electrode roll A2 for the next lithium element supplementation; To increase the number of times the separator roll can be used, a separator made of non-woven fabric with a thickness of 20-200um is preferably used.

[0041] Preferably, an annular sealing ring 28 is also provided at the connection position between the placement base 26 and the top cover body 27. A negative pressure port 37 communicating with the second placement groove 270 is also provided on the top side of the top cover body 27. The top cover body 27 is connected to a suction mechanism 38 through the negative pressure port 37. The cylindrical core 20 is completely sealed by the cylindrical core placement device 02, and the annular sealing ring 28 can be made of a corrosion-resistant ring-shaped sealing ring. The negative pressure port 37 is connected to the hose 370 by a clamp. The hose 370 is a corrosion-resistant hose. The sealing effect is achieved by adjusting the tightness of the clamp piece. The placement space is in a negative pressure environment through the suction mechanism 38 to ensure that the gas generated during the charging of the cylindrical core 20 does not leak, effectively avoiding safety, environmental protection and other problems.

[0042] Preferably, the surfaces of the positive end cap plate 30 and the negative end cap plate 31 are both provided with strip-shaped connecting pieces 40 evenly distributed in a disk-dispersed manner. Each strip-shaped connecting piece 40 is in extrusion contact with the electrode of the cylindrical core 20, achieving stable connection by increasing the contact area and reducing the contact resistance; lead holes 41 are provided on both the positive end cap plate 30 and the negative end cap plate 31, and the positive lead 32 and the negative lead 33 are inserted into the lead holes 41 respectively, which can facilitate and quickly realize the connection between the internal circuit of the cylindrical core 20 and the charging power source in the charging power source cabinet 34.

[0043] Example 2

[0044] The present invention is directed to supplementing sodium at the negative electrode of a sodium-ion battery, and the positive electrode provides an electrode for the sodium source. The positive electrode material should preferably be a material with rich raw materials, low price, environmental friendliness, and good safety. Generally, Prussian compounds, poly-silver ion compounds, and sodium-rich materials such as sodium-rich compounds and nano-composite materials based on conversion reactions are selected. The electrolyte can be selected and is not limited to organic solutions of sodium hexafluorophosphate. The rest is the same as in Example 1.

[0045] Example 3

[0046] The present invention is directed to supplementing magnesium at the negative electrode of a magnesium-ion battery, and the positive electrode provides an electrode for the magnesium source. The positive electrode material should preferably be a material with rich raw materials, low price, environmental friendliness, and good safety. Generally, transition metal oxides, Chevrel phases, sulfides, poly-silver ion compounds, Prussian compounds and other sodium-rich compounds are selected. The electrolyte can be selected and is not limited to Grignard reagents, inorganic magnesium salt electrolytes, and THF solutions of organic magnesium haloaluminates. The rest is the same as in Example 1.

[0047] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0048] It should be understood that the present application is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application.

Claims

1. A system for supplementing metal elements, characterized in that, Including: A winding machine, on one side of the discharging end of the winding machine, there is a cylindrical core placing device, the cylindrical core placing device is electrically connected to a charging device, and on one side of the cylindrical core placing device, there is an unwinding machine; The winding machine includes wetting rollers (13), the wetting rollers (13) are arranged in pairs, and a pair of the wetting rollers (13) are attached to both sides of the cylindrical core battery electrode sheet. The wetting rollers (13) are of a hollow structure, and at one end of the wetting rollers (13), there is a liquid inlet (22) communicated with an external electrolyte transportation pipeline. On the outer circumferential surface of the wetting rollers (13), there are a plurality of first liquid seepage holes (23). The outer surface of the wetting rollers (13) is wrapped with an elastic film (24), and on the elastic film (24), there are second liquid seepage holes (25); The cylindrical core placing device includes a placing base (26), on the placing base (26), there is a first placing groove (260), at a position of the placing base (26) close to the first placing groove (260), there is a notch (29), a top cover body (27) is clamped on the placing base (26), on the top cover body (27), there is a second placing groove (270) corresponding to the first placing groove (260). A cylindrical core (20) with a positive end cover plate (30) and a negative end cover plate (31) respectively buckled at both ends is located in the placing space formed by the first placing groove (260) and the second placing groove (270), and the core shafts (21) at both ends of the cylindrical core (20) are located at the notch (29); The charging device includes a charging power supply cabinet (34), and the charging power supply cabinet (34) is connected to both the positive end cover plate (30) and the negative end cover plate (31); The unwinding machine includes a drying box body (42) at the front end of a second process rectifying mechanism (43), and the electrode sheet and the separator on the cylindrical core (20) penetrate through the drying box body (42); On the surfaces of the positive end cover plate (30) and the negative end cover plate (31), there are also a plurality of uniformly distributed strip-shaped connecting pieces (40), and each of the strip-shaped connecting pieces (40) is in extrusion contact with the electrode of the cylindrical core (20); The positive terminal (35) of the charging power supply cabinet (34) is electrically connected to the positive end cover plate (30) through a positive lead wire (32), and the negative terminal (36) of the charging power supply cabinet (34) is electrically connected to the negative end cover plate (31) through a negative lead wire (33).

2. The system for supplementing metal elements according to claim 1, characterized in that At the connection part between the placing base (26) and the top cover body (27), there is also an annular sealing ring (28).

3. The system for supplementing metal elements according to claim 2, characterized in that, On the top side of the top cover body (27), there is also a negative pressure port (37) communicated with the second placing groove (270). The top cover body (27) is communicated with a hose (370) through the negative pressure port (37), and the other end of the hose (370) is communicated with an air extraction mechanism (38).

4. The system for supplementing metal elements according to claim 1, characterized in that The positive end cover plate (30) and the negative end cover plate (31) are both provided with lead round holes (41), and the positive lead (32) and the negative lead (33) are respectively inserted into the corresponding lead round holes (41).

5. The system for supplementing metal elements according to claim 1, characterized in that, Each of the first liquid seepage holes (23) is evenly distributed on the outer circumferential surface of the infiltration roller (13).

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