Lithium battery tab electroplating process and device

Abstract

The invention discloses a lithium battery tab electroplating process and device, and relates to the technical field of lithium battery tab processing, the lithium battery tab electroplating device comprises an electroplating bath, and the middle of the electroplating bath is provided with a middle plate used for adjusting the internal width of a tab metal sheet guide structure; a plurality of groups of tab metal sheet guide structures are arranged on the surface of the middle plate and one inner wall of the electroplating bath; the tab metal sheets cannot fall off along the interiors of the tab metal sheet guiding structures, the directions of the two second pressing blocks can determine the path of the strip-shaped tab metal sheets, the tab metal sheets are flattened, the surface flatness after electroplating is neat, the internal width of the electroplating bath can be adjusted according to the width of the tab metal sheets, and the electroplating efficiency is improved. The electrode lug metal sheet is ensured to be located between the fixing discs, the electroplating process is carried out through the electro-catalysis effect, the layer has excellent corrosion resistance, abrasion resistance and lubricity, the service life of parts can be prolonged, and the performance of chemical nickel alloy plating can be achieved through high-phosphorus electroplating.

Description

Technical Field

[0001] The 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 part of the lithium battery manufacturing process. The main purpose is to electroplate a layer of metal on the tabs of the lithium battery (i.e., the lead-out sheets of the positive and negative electrodes of the battery) to enhance the conductivity and mechanical strength of the tabs. The tab electroplating process has very high requirements on the quality of the electroplating layer, because it directly affects the performance and reliability of the lithium battery. Therefore, in the entire electroplating process, the tab electroplating process parameters and environmental conditions need to be strictly controlled;

[0003] In the prior art, when the lithium battery tabs are electroplated, the strip-shaped tab metal sheet is generally placed in the electroplating tank as a whole. 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 of the metal sheets 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 it difficult to treat the wastewater, thereby increasing 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 a metal sheet wound into a disc shape is placed in the liquid of the electroplating tank, which may cause insufficient penetration of the liquid into the gaps of the metal sheets, especially when the metal sheets are placed in the electroplating liquid when they are relatively tightly attached, thereby causing the surface electroplating effect of the metal sheets to be uneven between each layer of the tab 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, and the wastewater treatment is difficult, thereby the cost of electroplating is high.

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

[0006] A lithium battery tab electroplating device comprises a plating tank; an intermediate plate for adjusting the internal width of a tab metal sheet guide structure is arranged in the middle of the plating tank; a plurality of groups of tab metal sheet guide structures are arranged on the surface of the intermediate plate and an inner wall of the plating tank; the tab metal sheet guide structure comprises a fixed plate, the fixed plate is arranged on the surface of the intermediate plate and an inner wall of the plating tank; a pair of second fixing pins are arranged inside each of the fixed plates; a first swing plate and a second swing plate are respectively sleeved on the outside of the two second fixing pins; the first swing plate and the second swing plate are both rotatably connected with the second fixing pins; a first fixing pin is arranged 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 opened on the surface of the fixed plate; the two first fixing pins are both slidably connected with the inside of the second fixing groove; a first fixing roller and a second fixing roller are respectively arranged on the surface of the fixed plate and at the two first fixing pins; the outer circle of the first fixing roller and the outer circle of the second fixing roller rotate relatively; the outer part of the first fixing roller and the outer part of the second fixing roller are sleeved with a first pressing block; the first pressing block of the first fixing roller fits 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 internal fixing block of 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 clamping blocks respectively, and a second clamping block is integrally arranged at the joint of the two first clamping blocks, and the two second clamping blocks are in contact with each other, and the two second clamping blocks are used to clamp the conductive material of the middle tab, 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, a plurality of 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 opened on the inner wall of the electroplating tank, and an intermittent adjustment structure is arranged between the inner wall of the electroplating tank and the middle plate, and the intermittent adjustment structure includes an intermediate block welded in the middle of the first fixed groove, and the inner part of the intermediate block is rotatably connected with a threaded rod, and a first fixed block and a third fixed block are arranged at both ends of the threaded rod, and the two ends of the threaded rod are respectively threadedly connected to the first fixed block and the third fixed block, and 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 arranged 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 far 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 impurities such as oil and oxides on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemical agents to increase its surface activity and improve the adhesion of the electroplating layer.

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

[0017] Step 3: prepare the hanger and the workpiece, guide the strip-shaped 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 in a certain shape to immerse the tab metal sheet in the electroplating tank;

[0018] Step 4: immerse the pretreated object in an electrolyte containing phosphoric acid or phosphate, connect a power source, and perform electroplating by electrocatalysis;

[0019] Step 5: Electroplating the lithium battery tabs, selecting a suitable electroplating solution according to the tab material, setting appropriate current, voltage, time and other parameters to ensure the uniformity and thickness of the electroplating layer, immersing the tabs in the electroplating solution, and reducing the metal ions in the electroplating solution on the tab surface through the action of the current 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 to 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 usually made of metal sheets and polymer composite materials, the electroplating solution usually 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 limit the strip-shaped tab metal sheet, so that the tab metal sheet will not fall off along the inside of each tab metal sheet guide structure, and the orientation of the two second pressing blocks can be adjusted according to the installation angle of the fixed plate, and the orientation of the two second pressing blocks can determine the path of the strip-shaped tab metal sheet;

[0024] The two swing plates are pressed against by the telescopic spring, 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 so that the tab metal sheet is flattened, the lithium battery tab is electroplated more thoroughly, and the surface flatness after electroplating is more uniform;

[0025] An intermittent adjustment structure is provided. The first fixing block and the third fixing block can be screwed together by rotating the threaded rod, and the position of the second fixing block can be changed. The middle plate moves along the inner wall of the electroplating tank, and the inner width of the electroplating tank can be adjusted according to the width of the pole ear metal sheet to ensure that the pole ear 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] In order 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 It is a schematic diagram of the interior of the electroplating tank of the present invention;

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

[0031] Figure 4 It is a schematic diagram of the first fixing pin and the second fixing groove of the present invention;

[0032] Figure 5 It is a schematic diagram of the guide ring and telescopic spring of the present invention;

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

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

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

[0036] Fig. 9 It is a 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. guide structure of the metal sheet of the pole ear; 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 solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1:

[0040] See also Figure 1 - Figure 5 As shown, a lithium battery tab electroplating device comprises a plating tank 1; an intermediate plate 2 for adjusting the internal width of a tab metal sheet guide structure 3 is arranged in the middle of the plating 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 a plurality of groups of tab metal sheet guide structures 3 are arranged on the surface of the intermediate plate 2 and an inner wall of the plating tank 1, and the tab metal sheet guide structure 3 comprises a fixing plate 31, and the fixing plate 31 is arranged on the surface of the intermediate plate 2 and an inner wall of the plating tank 1, and the surface of the intermediate plate 2 and the inner wall of the plating tank 1 are arranged in pairs, and a pair of second fixing pins 37 are arranged inside each fixing plate 31, and the two second fixing pins 37 are arranged inside each fixing plate 31. The first swing plate 38 and the second swing plate 39 are respectively sleeved on the outside of 7, and the first swing plate 38 and the second swing plate 39 are rotatably connected with the second fixed 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 fixed pins 32 at each end to move, and the two first fixed pins 32 move along the inner wall of the second fixed groove 36, so that the first fixed rollers 33 and the second fixed rollers 34 of the two first fixed 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 pole ear The metal material is extruded to ensure that the strip-shaped pole ear metal material is conveyed along the pole ear metal sheet guide structure 3, and each pole ear metal sheet guide structure 3 can move the strip-shaped pole ear 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 pole ear 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 opened 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 first fixing pin 32. The fixed roller 33 and the second fixed roller 34, the outer circle of the first fixed roller 33 and the outer circle of the second fixed roller 34 rotate relatively, the outside of the first fixed roller 33 and the outside of the second fixed roller 34 are both sleeved with a first clamping block 35, the first clamping block 35 of the first fixed roller 33 is in contact with the first clamping block 35 of the second fixed roller 34, the strip-shaped pole lug metal sheet is transported between the two first clamping blocks 35, and the direction of the two second clamping blocks 313 is also used to guide the strip-shaped pole lug metal sheet, the strip-shaped pole lug metal sheet along each pole lug metal sheet guide structure 3 is more thoroughly electroplated, and the electroplating efficiency when the strip-shaped pole lug metal sheet is guided along the pole lug metal sheet guide structure 3 is higher than the electroplating efficiency of the strip-shaped pole lug 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, the guide ring 310 is slidably connected with the inside of the guide grooves 312, and the second fixed block 53 inside the guide grooves 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, and the first swing plate 38 and the second swing plate 39 are connected to each other. The plate 39 can slide along the inside of the guide ring 310. 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. 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 for clamping 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 clamping 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 clamping blocks 35 are used to clamp the strip-shaped pole lug metal sheet to prevent it from detaching from the first clamping block 35, and the direction of the strip-shaped pole lug metal sheet is adjusted by the direction of the two second clamping blocks 313.

[0043] See also Figure 7As shown, a plurality of rows of fixing holes 317 and middle holes 318 are provided on an inner wall of the electroplating tank 1 and the surface of the middle plate 2. The fixing holes 317 are arranged in a circular array outside the middle hole 318. There are eight fixing rods 315. The back of the fixed plate 31 is provided with fixing rods 315 and fixing columns 316. The fixing rods 315 are arranged in a circular array outside the fixing columns 316. There are four third fixing blocks 55. The fixing columns 316 correspond to the middle holes 318, and the fixing rods 315 correspond to the fixing holes 317. The fixing plate 31 can be pressed against the surface of the middle plate 2 and the inner wall of the electroplating tank 1. Similarly, the angle of the fixing plate 31 can be adjusted according to the angle requirements of the fixing 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 on the fixing column 316 installed inside the middle hole 318, and the fixing rod 315 is adjusted to be located inside the fixing hole 317 according to the orientation of the two second clamping blocks 313. The orientation of the two second clamping blocks 313 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, and the direction of the strip electrode metal sheet can be 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 the first Between a fixed roller 33 and a second fixed roller 34, two first clamping blocks 35 guide the first clamping block 35 to immerse the strip-shaped pole ear metal sheet inside the electroplating tank 1, wherein the copper pole ear usually adopts an acidic copper plating solution, and the nickel pole ear 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-shaped pole ear 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 pole ear 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, and the inner part of the intermediate block 57 is rotatably connected with a threaded rod 54, and the threaded rod 54 rotates inside the intermediate block 57. The threads of the two ends of the threaded rod 54 rotate in opposite directions. The two 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, so that the first fixed block 51 and the third fixed block 55 are close to or away from each other, the second fixed block 53 is welded on the back of the middle plate 2, and the first connecting rod 52 and the 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 pole ear metal sheet.

[0046] See also Figure 8 and Fig. 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 impurities such as oil and oxides on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemical agents 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: Choose the right lithium battery tab. Since the two tabs of the lithium battery are made of different materials, the tab is a key component that connects the positive and negative electrodes of the battery cell with the external circuit. The tab material must have good conductivity. Copper tabs usually use acidic copper plating solution, while nickel tabs use alkaline nickel plating solution.

[0050] 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 to immerse the tab metal sheet in 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 electrocatalysis to perform electroplating. By adding a specific phosphorus source such as phosphoric acid or phosphate to the electrolyte, the metal ions in the electrolyte are reduced on the cathode surface under the action of the electric field, 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;

[0052] Step 5: Electroplating the lithium battery tabs, selecting a suitable electroplating solution according to the tab material, setting appropriate current, voltage, time and other parameters to ensure the uniformity and thickness of the electroplating layer, immersing the tabs in the electroplating solution, and reducing the metal ions in the electroplating solution on the tab surface through the action of the current 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 to ensure the stability and conductivity of the coating.

[0054] The lithium battery tabs in steps 1 to 6 are usually made of metal sheets and polymer composite materials. The electroplating solution usually contains metal salts, conductive salts and additives. The copper tabs use acidic copper plating solution, while the nickel tabs use alkaline nickel plating solution, which solves the problem of frequent replacement of the solution, is more environmentally friendly, and has improved corrosion resistance. High-phosphorus electroplating can achieve the performance of chemical plating P-NI alloy, which determines the quality, corrosion resistance and other properties of the coating. Usually, a certain proportion of phosphoric acid or phosphate, as well as conductive salts, stabilizers, etc. need to be added.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. 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 arranged in the middle of the electroplating tank (1); a plurality of groups of tab metal sheet guide structures (3) are arranged on the surface of the intermediate plate (2) and an inner wall of the electroplating tank (1); the tab metal sheet guide structure (3) comprises a fixed disk (31); the fixed disk (31) is arranged 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 arranged inside each of the fixed disks (31); a first swinging plate (38) and a second swinging plate (39) are respectively sleeved on the outside of the two second fixing pins (37); the first swinging plate (38) and the second swinging 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 fixing plate (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 fixing plate (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 sleeved with a first pressing block (35); the first pressing block (35) of the first fixing roller (33) fits 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 plate (31) and located inside the first swing plate (38) and inside the second swing plate (39), and 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), and telescopic springs (311) are sleeved at both ends of the guide ring (310), the two ends of one telescopic spring (311) are respectively in contact with the inner wall of the fixed plate (31) and the side wall of the first swing plate (38), and the two ends of the other telescopic spring (311) are respectively in contact with the inner wall of the fixed plate (31) and the inner wall of the second swing plate (39).

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 from each other.

5. A 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 clamping blocks (35) respectively, and a second clamping block (313) is integrally arranged at the joint of the two first clamping blocks (35), and the two second clamping blocks (313) are in contact with each other, and the two second clamping blocks (313) are used to compress the conductive material of the tab in the middle, and the ends of the first fixed roller (33) and the second fixed roller (34) are both threadedly connected with connecting sleeves (314), and the two connecting sleeves (314) are respectively connected to the first fixed roller (33) and the second fixed roller (34).

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

7. A 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) comprises an intermediate block (57) welded to the middle of the first fixed groove (4), and a threaded rod (54) is rotatably connected inside the intermediate block (57). A first fixed block (51) and a third fixed block (55) are provided at both ends of the threaded rod (54), 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. A 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 impurities such as oil and oxides on the surface to ensure good bonding between the electroplating layer and the base metal. Treat the tab surface with chemical agents to increase its surface activity and improve the adhesion of the electroplating layer. Step 2: Choose the right lithium battery tabs. Since the two tabs of lithium batteries are made of different materials, the tabs are the key components that connect the positive and negative electrodes of the battery cell with the external circuit. The tab materials must have good conductivity. Step 3: preparing a hanger and a workpiece, guiding 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 arranging the tab metal sheet in a certain shape to immerse the tab metal sheet in the electroplating tank (1); Step 4: immerse the pretreated object in an electrolyte containing phosphoric acid or phosphate, connect a power source, and perform electroplating by electrocatalysis; Step 5: Electroplating the lithium battery tabs, selecting a suitable electroplating solution according to the tab material, setting appropriate current, voltage, time and other parameters to ensure the uniformity and thickness of the electroplating layer, immersing the tabs in the electroplating solution, and reducing the metal ions in the electroplating solution on the tab surface through the action of the current 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 to 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 usually made of metal sheets and polymer composite materials. The electroplating solution usually 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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