A lithium battery tab electroplating process and device

Abstract

The present invention discloses a lithium battery tab electroplating process and device, which relates to the technical field of lithium battery tab processing, including an electroplating tank, wherein an intermediate plate for adjusting the internal width of a tab metal sheet guide structure is provided in the middle of the electroplating tank, and a plurality of groups of tab metal sheet guide structures are provided on the surface of the intermediate plate and an inner wall of the electroplating tank; the tab metal sheets of the present invention will not fall off along the interior of each tab metal sheet guide structure, the orientation of the two second pressing blocks can determine the path of the strip tab metal sheet, the tab metal sheet is flattened, and the surface flatness after electroplating is relatively uniform, and the internal width of the electroplating tank can be adjusted according to the width of the tab metal sheet to ensure that the tab metal sheet is located between fixed plates, and the electroplating process is carried out by utilizing electrocatalysis, the layer has excellent corrosion resistance, wear resistance and lubricity, can improve the service life of parts, and high-phosphorus electroplating can achieve the performance of chemical nickel alloy plating.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery tab processing, and in particular to a lithium battery tab electroplating process and device. Background Art

[0002] The battery tab electroplating process is an important step in the lithium battery manufacturing process. The main purpose is to electroplate a layer of metal on the lithium battery tab (i.e., the lead-out tab of the positive and negative electrodes of the battery) to enhance the conductivity and mechanical strength of the tab. The tab electroplating process has very high requirements for the quality of the electroplating layer because it directly affects the performance and reliability of the lithium battery. Therefore, throughout the electroplating process, the tab electroplating process parameters and environmental conditions need to be strictly controlled.

[0003] In the prior art, when electroplating the lithium battery tabs, the strip-shaped tab metal sheet is generally placed as a whole into the electroplating tank. The metal sheet wound into a disc shape is placed in the electroplating tank liquid, which may cause insufficient liquid penetration into the gaps of the metal sheets, especially when the metal sheets are placed in the electroplating liquid when they are relatively tightly fitted, resulting in uneven surface plating effect of the metal sheet between each layer of the tab metal sheet during electroplating, or defects in the surface plating of the tab after electroplating. In addition, the ordinary electroplating process has poor corrosion resistance during the electroplating process. The wastewater discharged after the chemical nickel plating method is large and the wastewater composition is complex, making wastewater treatment difficult, thereby high the cost of electroplating. Summary of the Invention

[0004] The purpose of the present invention is to provide a lithium battery tab electroplating process and device to solve the problem proposed in the above background technology that the metal sheet wound into a disc shape is placed in the electroplating tank liquid, which may cause insufficient liquid penetration into the gaps of the metal sheets, especially when the metal sheets are placed in the electroplating liquid when they are relatively tightly fitted, thereby causing the liquid between each layer of the tab metal sheet to have an uneven surface electroplating effect on the metal sheet during electroplating, or there are defects in the surface electroplating of the tab after electroplating, and the ordinary electroplating process has poor corrosion resistance during the electroplating process, and the wastewater discharged after the chemical nickel plating method is large in amount and the wastewater composition is complex, making the wastewater treatment difficult, thereby increasing the cost of electroplating.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A lithium battery tab electroplating device comprises an electroplating tank; an intermediate plate for adjusting the internal width of a tab metal sheet guide structure is provided in the middle of the electroplating tank; a surface of the intermediate plate and an inner wall of the electroplating tank are provided with a plurality of arranged tab metal sheet guide structures; the tab metal sheet guide structure comprises a fixed plate, the fixed plate being provided on the surface of the intermediate plate and an inner wall of the electroplating tank; a pair of second fixing pins are provided inside each of the fixed plates; a first swing plate and a second swing plate are respectively sleeved on the exterior of the two second fixing pins; the first swing plate and the second swing plate are both rotatably connected to the second fixing pins; a first fixing pin is provided inside the fixed plate and at the end of the first swing plate and the end of the second swing plate; a second fixing groove is provided on the surface of the fixed plate; the two first fixing pins are both slidably connected to the interior of the second fixing groove; a first fixing roller and a second fixing roller are respectively provided on the surface of the fixed plate and at the two first fixing pins; the outer circumference of the first fixing roller and the outer circumference of the second fixing roller rotate relative to each other; a first pressing block is sleeved on the exterior of the first fixing roller and the exterior of the second fixing roller; the first pressing block of the first fixing roller is in contact with the first pressing block of the second fixing roller.

[0007] As a preferred technical solution of the present invention, a guide ring is provided inside the fixed plate and inside the first swing plate and the second swing plate, and guide grooves are provided inside the first swing plate and the second swing plate. The guide ring is located inside the two guide grooves, and telescopic springs are sleeved on both ends of the guide ring. The two ends of one telescopic spring are respectively in contact with the inner wall of the fixed plate and the side wall of the first swing plate, and the two ends of the other telescopic spring are respectively in contact with the inner wall of the fixed plate and the inner wall of the second swing plate.

[0008] As a preferred technical solution of the present invention, the guide ring is slidably connected to the inside of the guide groove, and the second fixing block inside the guide groove is larger than the diameter of the guide ring.

[0009] As a preferred technical solution of the present invention, the end of the first swing plate moves synchronously with the first fixed pin, the end of the second swing plate moves synchronously with the first fixed pin, and the first swing plate and the second swing plate move closer to or farther away from each other.

[0010] As a preferred technical solution of the present invention, the first fixed roller and the second fixed roller are rotatably connected to the two first pressing blocks respectively, and a second pressing block is integrally provided at the joint of the two first pressing blocks, and the two second pressing blocks are in contact with each other. The two second pressing blocks are used to press the conductive material of the tab in the middle, and the ends of the first fixed roller and the second fixed roller are both threadedly connected with connecting sleeves, and the two connecting sleeves are respectively connected to the first fixed roller and the second fixed roller.

[0011] As a preferred technical solution of the present invention, several rows of fixing holes and middle holes are provided on the surface of an inner wall of the electroplating tank and the middle plate, and the fixing holes are arranged in a circular array outside the middle hole. Fixed rods and fixed columns are provided on the back of the fixed plate, and the fixing rods are arranged in a circular array outside the fixed columns. The fixed columns correspond to the middle holes, and the fixing rods correspond to the fixed holes.

[0012] As a preferred technical solution of the present invention, a first fixed groove is provided on the inner wall of the electroplating tank, and an intermittent adjustment structure is provided between the inner wall of the electroplating tank and the middle plate. The intermittent adjustment structure includes an intermediate block welded in the middle of the first fixed groove, and the internal rotation of the intermediate block is connected to a threaded rod, and a first fixed block and a third fixed block are provided at both ends of the threaded rod. The two ends of the threaded rod are respectively threadedly connected to the first fixed block and the third fixed block. A second fixed block is welded on the back of the middle plate, and a first connecting rod and a second connecting rod are respectively provided between the first fixed block and the second fixed block and between the third fixed block and the second fixed block, and the middle plate is close to or away from the inner wall of the electroplating tank.

[0013] As a preferred technical solution of the present invention, the first fixed block and the third fixed block are close to or away from each other, the two ends of the first connecting rod are movably connected to the first fixed block and the second fixed block respectively, and the two ends of the second connecting rod are movably connected to the third fixed block and the second fixed block respectively.

[0014] A lithium battery tab electroplating process comprises the following steps:

[0015] Step 1: Preparation before electroplating of lithium battery tabs: clean the tabs to remove oil and oxide impurities on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemicals to increase its surface activity and improve the adhesion of the electroplating layer.

[0016] Step 2: Select the appropriate lithium battery tabs. Since the two tabs of the lithium battery are made of different materials, the tabs are the key components that connect the positive and negative poles of the battery cell with the external circuit. The tab material must have good conductivity.

[0017] Step 3: Prepare the hanger and the workpiece, guide the strip of metal tab along the first pressing block and the second pressing block of the tab metal sheet guide structure, and arrange the tab metal sheet into a certain shape and immerse the tab metal sheet in the inside of the electroplating tank;

[0018] Step 4: Immerse the pre-treated object in an electrolyte containing phosphoric acid or phosphate, connect the power supply, and perform electroplating by electrocatalysis;

[0019] Step 5: Electroplate the lithium battery tabs. Select a suitable electroplating solution based on the tab material, set appropriate current, voltage, and time parameters to ensure the uniformity and thickness of the electroplating layer, immerse the tabs in the electroplating solution, and use the current to reduce the metal ions in the electroplating solution on the tab surface to form a metal plating layer.

[0020] Step 6: Post-processing of lithium battery tab electroplating. After electroplating, clean the tab with pure water to remove residual plating solution and impurities on the surface, passivate the coating to improve its corrosion resistance and oxidation resistance, and dry the cleaned tab to remove moisture and ensure the stability and conductivity of the coating.

[0021] As a preferred technical solution of the present invention, the lithium battery tabs in steps one to six are made of metal sheets and polymer composite materials, the electroplating solution contains metal salts, conductive salts and additives, the copper tabs use acidic copper plating solution, and the nickel tabs use alkaline nickel plating solution.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The two first pressing blocks of the tab metal sheet guide structure can restrict the strip of tab metal sheet so that the tab metal sheet will not fall off along the interior of each tab metal sheet guide structure. In addition, the orientation of the two second pressing blocks can be adjusted according to the installation angle of the fixing plate. The orientation of the two second pressing blocks can determine the path of the strip of tab metal sheet.

[0024] The telescopic spring presses against the two swing plates, and the two swing plates are moved closer to each other under the action of the telescopic spring, so that the pressing blocks at the ends of the two swing plates are fitted together to make the tab metal sheet flat, and the lithium battery tab is electroplated more thoroughly, and the surface flatness after electroplating is more uniform;

[0025] An intermittent adjustment structure is provided. Rotating the threaded rod can change the screwing of the first and third fixed blocks, and the position of the second fixed block can be changed. The middle plate moves along the inner wall of the electroplating tank, and the internal width of the electroplating tank can be adjusted according to the width of the tab metal sheet to ensure that the tab metal sheet is located between the fixed plates;

[0026] The pre-treated object to be plated is immersed in an electrolyte containing phosphoric acid or phosphate, and the power is turned on. The electroplating process is carried out using electrocatalysis, which solves the problem of frequent replacement of the solution and is more environmentally friendly. The coating has excellent corrosion resistance, wear resistance and lubricity, which can increase the service life of the parts. High-phosphorus electroplating can achieve the performance of chemical nickel alloy plating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0028] Figure 1 It is the main structure diagram of the present invention;

[0029] Figure 2 Schematic diagram of the interior of the electroplating tank of the present invention;

[0030] Figure 3 This is a schematic diagram of the tab metal sheet guide structure of the present invention;

[0031] Figure 4 A schematic diagram of the first fixing pin and the second fixing slot of the present invention;

[0032] Figure 5 Schematic diagram of the guide ring and telescopic spring of the present invention;

[0033] Figure 6 Schematic diagram of the first pressing block and the second pressing block of the present invention;

[0034] Figure 7 A schematic diagram of a fixing rod and a fixing hole of the present invention;

[0035] Figure 8 This is a schematic diagram of the intermittent adjustment structure of the present invention;

[0036] Figure 9 Schematic diagram of the first connecting rod and the second connecting rod of the present invention.

[0037] In the figure: 1. electroplating tank; 2. middle plate; 3. tab metal sheet guide structure; 4. first fixed groove; 5. intermittent adjustment structure; 31. fixed plate; 32. first fixed pin; 33. first fixed roller; 34. second fixed roller; 35. first clamping block; 36. second fixed groove; 37. second fixed pin; 38. first swing plate; 39. second swing plate; 310. guide ring; 311. telescopic spring; 312. guide groove; 313. second clamping block; 314. connecting sleeve; 315. fixing rod; 316. fixing column; 317. fixing hole; 318. middle hole; 51. first fixed block; 52. first connecting rod; 53. second fixed block; 54. threaded rod; 55. third fixed block; 56. second connecting rod; 57. middle block. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Example 1:

[0040] See also Figure 1 - Figure 5 As shown, a lithium battery tab electroplating device includes an electroplating tank 1; an intermediate plate 2 for adjusting the internal width of a tab metal sheet guide structure 3 is provided in the middle of the electroplating tank 1, and the position of the intermediate plate 2 can be adjusted according to the width of the lithium battery tab strip metal material, and the surface of the intermediate plate 2 and an inner wall of the electroplating tank 1 are provided with a plurality of arranged tab metal sheet guide structures 3, and the tab metal sheet guide structure 3 includes a fixed disk 31, and the fixed disk 31 is provided on the surface of the intermediate plate 2 and an inner wall of the electroplating tank 1, and the fixed disk 31 can be installed between the surface of the intermediate plate 2 and an inner wall of the electroplating tank 1, and the surface of the intermediate plate 2 and the inner wall of the electroplating tank 1 are arranged in pairs, and a pair of second fixing pins 37 are provided inside each fixed disk 31, and the two The first swing plate 38 and the second swing plate 39 are respectively sleeved on the outside of the second fixing pin 37, and the first swing plate 38 and the second swing plate 39 are rotatably connected to the second fixing pin 37. Under the action of the two sets of telescopic springs 311, the first swing plate 38 and the second swing plate 39 are pushed to move toward the middle along the guide ring 310, so that the first swing plate 38 and the second swing plate 39 drive the first fixing pins 32 at each end to move, and the two first fixing pins 32 move along the inner wall of the second fixing groove 36, so that the first fixing rollers 33 and the second fixing rollers 34 of the two first fixing pins 32 move toward the middle, and the two first pressing blocks 35 guide the strip-shaped pole ear metal material, and the second pressing block 313 is used to press The strip-shaped tab metal material is extruded to ensure that the strip-shaped tab metal material is conveyed along the tab metal sheet guide structure 3, and each tab metal sheet guide structure 3 can move the strip-shaped tab metal sheet in different paths, and can move in an S-shaped or specific path. The immersion time inside the electroplating tank 1 is controlled according to the length of the path or the conveying speed of the strip-shaped tab metal sheet. A first fixing pin 32 is provided inside the fixed disk 31 and at the end of the first swing plate 38 and the end of the second swing plate 39. A second fixing groove 36 is provided on the surface of the fixed disk 31. The two first fixing pins 32 are slidably connected to the inside of the second fixing groove 36. The surface of the fixed disk 31 and at the two first fixing pins 32 are respectively provided with a second fixing pin 32. A fixed roller 33 and a second fixed roller 34, the outer circle of the first fixed roller 33 and the outer circle of the second fixed roller 34 rotate relative to each other, the outside of the first fixed roller 33 and the outside of the second fixed roller 34 are both sleeved with a first pressing block 35, the first pressing block 35 of the first fixed roller 33 fits with the first pressing block 35 of the second fixed roller 34, the strip-shaped tab metal sheet is transported between the two first pressing blocks 35, and the direction of the two second pressing blocks 313 is also used to guide the strip-shaped tab metal sheet. The electroplating of the strip-shaped tab metal sheet along each tab metal sheet guide structure 3 is more thorough, and the electroplating efficiency when the strip-shaped tab metal sheet is guided along the tab metal sheet guide structure 3 is higher than the electroplating efficiency of the strip-shaped tab metal sheet directly.

[0041] See also Figure 3 - Figure 6 As shown, a guide ring 310 is provided inside the fixed plate 31 and inside the first swing plate 38 and the second swing plate 39, and a guide groove 312 is provided inside the first swing plate 38 and the second swing plate 39. The guide ring 310 is located inside the two guide grooves 312, and the guide ring 310 is slidably connected to the inside of the guide groove 312. The second fixed block 53 inside the guide groove 312 is larger than the diameter of the guide ring 310, which can ensure that the guide ring 310 floats inside the first swing plate 38 and the second swing plate 39. The first swing plate 38 and the second swing plate 39 are both provided with a guide groove 312. The plate 39 can slide along the inside of the guide ring 310. Both ends of the guide ring 310 are provided with telescopic springs 311. The two ends of one telescopic spring 311 are in contact with the inner wall of the fixed disk 31 and the side wall of the first swing plate 38 respectively, and the two ends of the other telescopic spring 311 are in contact with the inner wall of the fixed disk 31 and the inner wall of the second swing plate 39 respectively. The two telescopic springs 311 are used to move the first swing plate 38 and the second swing plate 39 toward the middle, the two first fixing pins 32 move along the inside of the second fixing groove 36, and the two first clamping blocks 35 also move toward the middle.

[0042] See also Figure 6 As shown, the end of the first swing plate 38 moves synchronously with the first fixed pin 32, and the end of the second swing plate 39 moves synchronously with the first fixed pin 32, and the first swing plate 38 and the second swing plate 39 move closer to or farther away from each other; the first fixed roller 33 and the second fixed roller 34 are respectively rotatably connected to the two first clamping blocks 35, and the second clamping block 313 is integrally provided at the joint of the two first clamping blocks 35, and the two second clamping blocks 313 are in contact with each other. The two second clamping blocks 313 can flatten the strip-shaped pole ear metal sheet to ensure a better effect of lithium battery electroplating. The two second clamping blocks 313 are used to clamp The ends of the first fixed roller 33 and the second fixed roller 34 are both threadedly connected with a connecting sleeve 314, and the two connecting sleeves 314 are respectively connected to the first fixed roller 33 and the second fixed roller 34, and the two first pressing blocks 35 are locked on the first fixed roller 33 and the second fixed roller 34 through the two connecting sleeves 314. The first fixed roller 33 and the second fixed roller 34 move toward the middle, and the two groups of first pressing blocks 35 are used to press the strip of tab metal sheet to prevent it from detaching from the first pressing block 35, and the direction of the strip of tab metal sheet is adjusted by using the direction of the two second pressing blocks 313.

[0043] See also Figure 7As shown, an inner wall of the electroplating tank 1 and the surface of the middle plate 2 are provided with several rows of fixing holes 317 and middle holes 318, and the fixing holes 317 are arranged in a circular array outside the middle hole 318. There are eight fixing rods 315, and the back of the fixed plate 31 is provided with fixing rods 315 and fixing columns 316, and the fixing rods 315 are arranged in a circular array outside the fixing columns 316. There are four third fixed blocks 55, and the fixing columns 316 correspond to the middle holes 318, and the fixing rods 315 correspond to the fixing holes 317. The fixed plate 31 can be pressed against the surface of the middle plate 2 and the inner wall of the electroplating tank 1. The angle of the fixed plate 31 can also be adjusted according to the angle requirements of the fixed plate 31. The interior of the middle plate 2 is provided with transversely arranged square guide rods, and the middle plate 2 can be moved along the transversely arranged square guide rods.

[0044] It should be noted that, since the lithium battery needs to be electroplated on the battery tabs during processing and production, the fixing plate 31 is installed inside the fixing column 316 and the fixing rod 315 is located inside the fixing hole 317 according to the orientation of the two second clamping blocks 313. The orientation of the two fixing plates 31 can be adjusted by using the orientation of the two second clamping blocks 313, and the relative position of each fixing plate 31 can be determined. The direction of the strip electrode metal sheet is determined according to the relative position of each fixing plate 31. The strip-shaped tab metal sheet passes through the interior of each tab metal sheet guide structure 3 inside the electroplating tank 1, and the end of the tab metal sheet is moved along Between the first fixed roller 33 and the second fixed roller 34, two first pressing blocks 35 guide the tab metal sheet and immerse the strip tab metal sheet into the electroplating tank 1, wherein the copper tab adopts an acidic copper plating solution and the nickel tab adopts an alkaline nickel plating solution, and by adding a specific phosphorus source, such as phosphoric acid or phosphate, to the electrolyte, and then under the action of the electric field, the metal ions in the electrolyte are reduced on the cathode surface, and the phosphorus source is oxidized at the anode, and finally a plating layer with a high phosphorus content is formed on the cathode surface. The strip tab metal sheet can increase the time the metal sheet stays in the electroplating tank 1 according to the speed at which the electrode metal sheet is transported in the electroplating tank 1, ensuring that the electroplating of the lithium battery tab is more efficient.

[0045] See also Figure 2 and Figure 8As shown, the inner wall of the electroplating tank 1 is provided with a first fixed groove 4, and an intermittent adjustment structure 5 is provided between the inner wall of the electroplating tank 1 and the middle plate 2. The intermittent adjustment structure 5 includes an intermediate block 57 welded to the middle of the first fixed groove 4. The inner part of the intermediate block 57 is rotatably connected to a threaded rod 54. The threaded rod 54 rotates inside the intermediate block 57. The threads at both ends of the threaded rod 54 rotate in opposite directions. A first fixed block 51 and a third fixed block 55 are provided at both ends of the threaded rod 54. The two ends of the threaded rod 54 are respectively threadedly connected to the first fixed block 51 and the third fixed block 55, so that the first fixed block 51 and the third fixed block 55 are close to or away from each other, a second fixed block 53 is welded to the back of the middle plate 2, and a first connecting rod 52 and a second connecting rod 56 are respectively arranged between the first fixed block 51 and the second fixed block 53 and between the third fixed block 55 and the second fixed block 53. The positions of the first fixed block 51 and the third fixed block 55 change, so that the angle of the first connecting rod 52 and the second connecting rod 56 becomes larger or smaller, and the middle plate 2 is close to or away from the inner wall of the electroplating tank 1. The width of the electroplating tank 1 and the middle plate 2 can be adjusted according to the width of the lithium battery tab metal sheet.

[0046] See also Figure 8 and Figure 9 As shown, the first fixed block 51 and the third fixed block 55 are moved closer to or farther away from each other, and the thread rotation directions of the first fixed block 51 and the third fixed block 55 are different, so that after the threaded rod 54 is rotated, the two fixed blocks on the threaded rod 54 can be moved closer to or farther away from each other, and the two ends of the first connecting rod 52 are movably connected to the first fixed block 51 and the second fixed block 53 respectively, and the two ends of the second connecting rod 56 are movably connected to the third fixed block 55 and the second fixed block 53 respectively, so that the first connecting rod 52 and the second connecting rod 56 are pressed against the middle plate 2, and the inner wall width of the middle plate 2 and the electroplating tank 1 is changed.

[0047] A lithium battery tab electroplating process comprises the following steps:

[0048] Step 1: Preparation before electroplating of lithium battery tabs: clean the tabs to remove oil and oxide impurities on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemicals to increase its surface activity, improve the adhesion of the electroplating layer, and ensure good bonding between the electroplating layer and the tab material.

[0049] Step 2: Select the appropriate lithium battery tabs. Since the two tabs of the lithium battery are made of different materials, the lithium battery tabs are the key components connecting the positive and negative poles of the battery cell with the external circuit. The tab material must have good conductivity. Acidic copper plating solution is used for copper tabs, and alkaline nickel plating solution is used for nickel tabs.

[0050] Step 3: Prepare the hanger and workpiece, guide the strip of metal tab along the first pressing block 35 and the second pressing block 313 of the tab metal sheet guide structure 3, and arrange the tab metal sheet into a certain shape and immerse the tab metal sheet in the interior of the electroplating tank 1;

[0051] Step 4: Immerse the pretreated object in an electrolyte containing phosphoric acid or phosphate, connect the power supply, and use electrocatalytic action to perform electroplating. By adding a specific phosphorus source such as phosphoric acid or phosphate to the electrolyte, and then under the action of the electric field, the metal ions in the electrolyte are reduced on the cathode surface, while the phosphorus source is oxidized at the anode, eventually forming a plating layer with a high phosphorus content on the cathode surface;

[0052] Step 5: Electroplate the lithium battery tabs. Select a suitable electroplating solution based on the tab material, set appropriate current, voltage, and time parameters to ensure the uniformity and thickness of the electroplating layer, immerse the tabs in the electroplating solution, and use the current to reduce the metal ions in the electroplating solution on the tab surface to form a metal plating layer.

[0053] Step 6: Post-processing of lithium battery tab electroplating. After electroplating, clean the tab with pure water to remove residual plating solution and impurities on the surface, passivate the coating to improve its corrosion resistance and oxidation resistance, and dry the cleaned tab to remove moisture and ensure the stability and conductivity of the coating.

[0054] The lithium battery tabs in steps 1 through 6 are made of metal sheets and a polymer composite material. The plating solution contains metal salts, conductive salts, and additives. Copper tabs use an acidic copper plating solution, while nickel tabs use an alkaline nickel plating solution. This eliminates the need for frequent solution changes, is more environmentally friendly, and improves corrosion resistance. High-phosphorus plating achieves the performance of electroless P-Ni alloy plating, which determines the quality, corrosion resistance, and other properties of the coating. A certain proportion of phosphoric acid or phosphate, as well as conductive salts and stabilizers, are typically added.

[0055] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lithium battery tab electroplating device, comprising an electroplating tank (1); characterized in that: An intermediate plate (2) for adjusting the internal width of the tab metal sheet guide structure (3) is provided in the middle of the electroplating tank (1), and a plurality of groups of tab metal sheet guide structures (3) are provided on the surface of the intermediate plate (2) and an inner wall of the electroplating tank (1). The tab metal sheet guide structure (3) includes a fixed disk (31), and the fixed disk (31) is provided on the surface of the intermediate plate (2) and an inner wall of the electroplating tank (1). A pair of second fixing pins (37) are provided inside each of the fixed disks (31), and a first swing plate (38) and a second swing plate (39) are respectively sleeved on the outside of the two second fixing pins (37). The first swing plate (38) and the second swing plate (39) are both rotatably connected to the second fixing pins (37). The inside of the fixed disk (31) A first fixing pin (32) is provided at the end of the first swing plate (38) and the end of the second swing plate (39); a second fixing groove (36) is provided on the surface of the fixed disk (31); the two first fixing pins (32) are slidably connected to the inside of the second fixing groove (36); a first fixing roller (33) and a second fixing roller (34) are provided on the surface of the fixed disk (31) and at the two first fixing pins (32); the outer circle of the first fixing roller (33) and the outer circle of the second fixing roller (34) rotate relative to each other; the outside of the first fixing roller (33) and the outside of the second fixing roller (34) are both sleeved with a first pressing block (35); the first pressing block (35) of the first fixing roller (33) is in contact with the first pressing block (35) of the second fixing roller (34).

2. A lithium battery tab electroplating device according to claim 1, characterized in that: A guide ring (310) is provided inside the fixed disk (31) and located inside the first swing plate (38) and inside the second swing plate (39). Guide grooves (312) are provided inside the first swing plate (38) and inside the second swing plate (39). The guide ring (310) is located inside the two guide grooves (312). Both ends of the guide ring (310) are sleeved with telescopic springs (311). The two ends of one telescopic spring (311) are in contact with the inner wall of the fixed disk (31) and the side wall of the first swing plate (38), respectively, and the two ends of the other telescopic spring (311) are in contact with the inner wall of the fixed disk (31) and the inner wall of the second swing plate (39), respectively.

3. A lithium battery tab electroplating device according to claim 2, characterized in that: The guide ring (310) is slidably connected to the inside of the guide groove (312), and the second fixing block (53) inside the guide groove (312) is larger than the diameter of the guide ring (310).

4. A lithium battery tab electroplating device according to claim 3, characterized in that: The end of the first swing plate (38) moves synchronously with the first fixed pin (32), the end of the second swing plate (39) moves synchronously with the first fixed pin (32), and the first swing plate (38) and the second swing plate (39) move closer to or farther away from each other.

5. The lithium battery tab electroplating device according to claim 4, characterized in that: The first fixed roller (33) and the second fixed roller (34) are rotatably connected to the two first pressing blocks (35), and a second pressing block (313) is integrally provided at the joint of the two first pressing blocks (35), and the two second pressing blocks (313) are in contact with each other. The two second pressing blocks (313) are used to press the tab conductive material in the middle. The ends of the first fixed roller (33) and the second fixed roller (34) are both threadedly connected with a connecting sleeve (314), and the two connecting sleeves (314) are respectively connected to the first fixed roller (33) and the second fixed roller (34).

6. The lithium battery tab electroplating device according to claim 5, characterized in that: A plurality of rows of fixing holes (317) and middle holes (318) are provided on an inner wall of the electroplating tank (1) and a surface of the middle plate (2). The fixing holes (317) are arranged in a circular array outside the middle holes (318). A fixing rod (315) and a fixing column (316) are provided on the back of the fixing plate (31). The fixing rod (315) is arranged in a circular array outside the fixing column (316). The fixing column (316) corresponds to the middle holes (318), and the fixing rod (315) corresponds to the fixing holes (317).

7. The lithium battery tab electroplating device according to claim 6, characterized in that: The inner wall of the electroplating tank (1) is provided with a first fixed groove (4), and an intermittent adjustment structure (5) is provided between the inner wall of the electroplating tank (1) and the middle plate (2). The intermittent adjustment structure (5) includes an intermediate block (57) welded to the middle of the first fixed groove (4), and the inner portion of the intermediate block (57) is rotatably connected to a threaded rod (54), and both ends of the threaded rod (54) are provided with a first fixed block (51) and a third fixed block (55), and the two ends of the threaded rod (54) are respectively threadedly connected to the first fixed block (51) and the third fixed block (55), and a second fixed block (53) is welded to the back of the middle plate (2), and a first connecting rod (52) and a second connecting rod (56) are respectively provided between the first fixed block (51) and the second fixed block (53) and between the third fixed block (55) and the second fixed block (53), and the middle plate (2) is close to or away from the inner wall of the electroplating tank (1).

8. The lithium battery tab electroplating device according to claim 7, characterized in that: The first fixed block (51) and the third fixed block (55) are moved closer to or farther away from each other, the two ends of the first connecting rod (52) are movably connected to the first fixed block (51) and the second fixed block (53), and the two ends of the second connecting rod (56) are movably connected to the third fixed block (55) and the second fixed block (53).

9. A lithium battery tab electroplating process, used in the processing of the lithium battery tab electroplating device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Preparation before electroplating of lithium battery tabs: clean the tabs to remove oil and oxide impurities on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemicals to increase its surface activity and improve the adhesion of the electroplating layer. Step 2: Select the appropriate lithium battery tabs. Since the two tabs of the lithium battery are made of different materials, the tabs are the key components that connect the positive and negative poles of the battery cell with the external circuit. The tab material must have good conductivity. Step 3: Prepare the hanger and the workpiece, guide the strip-shaped metal tab along the first pressing block (35) and the second pressing block (313) of the tab metal sheet guide structure (3), and arrange the tab metal sheet in a certain shape and immerse the tab metal sheet in the interior of the electroplating tank (1); Step 4: Immerse the pre-treated object in an electrolyte containing phosphoric acid or phosphate, connect the power supply, and perform electroplating by electrocatalysis; Step 5: Electroplate the lithium battery tabs. Select a suitable electroplating solution based on the tab material, set appropriate current, voltage, and time parameters to ensure the uniformity and thickness of the electroplating layer, immerse the tabs in the electroplating solution, and use the current to reduce the metal ions in the electroplating solution on the tab surface to form a metal plating layer. Step 6: Post-processing of lithium battery tab electroplating. After electroplating, clean the tab with pure water to remove residual plating solution and impurities on the surface, passivate the coating to improve its corrosion resistance and oxidation resistance, and dry the cleaned tab to remove moisture and ensure the stability and conductivity of the coating.

10. A lithium battery tab electroplating process according to claim 9, characterized in that: The lithium battery tabs in steps 1 to 6 are made of metal sheets and polymer composite materials. The electroplating solution contains metal salts, conductive salts and additives. The copper tabs use an acidic copper plating solution, while the nickel tabs use an alkaline nickel plating solution.

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