Back contact battery copper grid line alternating current electroplating process and electroplating equipment device

Abstract

The invention discloses a back contact battery copper grid line alternating current electroplating process and electroplating equipment, and relates to the technical field of back contact photovoltaic cells, and the back contact battery copper grid line alternating current electroplating process comprises the following steps: S1, patterning: exposing the part, needing to be plated with copper, of the back surface of a battery piece through developing treatment; s2.1, irradiation: using strong light to irradiate the battery piece; s2.2, electroplating: placing the battery piece in an electrolytic tank to electroplate a copper grid line; s2.3, electrode connection: during irradiation and electroplating, the electrode A is connected to a copper foil parallel to the front surface of the battery piece, the electrode B is connected to an electrolyte, the electrode C is connected to the back surface of the battery piece, when the polarity of the electrode A is negative, the polarity of the electrode B is positive, and the electrode C is powered off, otherwise, when the polarity of the electrode A is positive, the electrode B is powered off, and the polarity of the electrode C is negative; and S3, post-processing. According to the electroplating method, the battery piece is irradiated with strong light, so that a large number of electrons and holes are excited in the battery piece, the resistance of the whole battery piece is reduced, and the electroplating efficiency and uniformity are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of crystalline silicon photovoltaic cells and back contact cells, and in particular to an alternating current electroplating process and electroplating equipment for copper grid lines of a back contact cell. Background Art

[0002] The back contact cell (BC cell) is a special solar cell technology. Its core feature is that the PN junction and metal contact are both located on the back of the cell, so that there is no electrode blocking the front of the cell, maximizing the use of incident light, reducing optical losses and improving conversion efficiency. This design enables the cell to absorb sunlight over the entire area without obstruction, thereby improving power generation efficiency.

[0003] Electroplating technology is a photovoltaic cell metal grid manufacturing technology that aims to reduce silver consumption and shading area and improve the performance of photovoltaic modules. Its core structure is to prepare a conductive seed layer on the cell surface for conducting electroplating current, and then electroplate copper grid lines on the conductive seed layer.

[0004] The disadvantage of the prior art is that, when the copper grid line is electroplated, the cross-sectional area of ​​the electroplated copper grid line is uneven due to the difference in current density at various locations on the conductive seed layer. Summary of the invention

[0005] The object of the present invention is to provide an AC electroplating process and electroplating equipment for copper grid lines of back contact batteries to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a back contact battery copper grid line AC electroplating process, comprising the following steps:

[0007] S1. Graphicalization: Through the development process of photolithography technology, the area on the back of the cell that needs to be copper-plated is exposed, and copper foil is tied to the insulating anti-reflective film on the front of the cell;

[0008] S2.1, irradiation: During electroplating, strong light is used to irradiate the cell, which stimulates a large number of electrons and holes in the cell, thereby reducing the resistance of the cell and improving the electroplating efficiency;

[0009] S2.2, electroplating: while irradiating, the cell is placed in an electrolytic cell for electroplating, and copper ions are reduced by electrolytic chemical reaction and deposited on the exposed surface, thereby forming copper grid lines;

[0010] S2.3, electrode connection: During irradiation and electroplating, electrode A is connected to the copper foil on the front side of the parallel cell, electrode B is connected to the electrolyte, and electrode C is connected to the back side of the cell. When the polarity of electrode A is negative, electrode B is positive and electrode C is powered off; conversely, when the polarity of electrode A is positive, electrode B is powered off and electrode C is negative.

[0011] S3, post-processing: cleaning, drying and anti-oxidation treatment of the battery cells to ensure the quality and stability of the copper grid lines.

[0012] Furthermore, when the polarity of the A electrode is negative, positive charge accumulates on the front surface of the battery cell, and negative charge accumulates on the back surface of the battery cell. The copper ions in the electrolyte capture the negative charge and convert it into copper element and deposit it as copper grid lines. Conversely, when the polarity of the A electrode is positive, negative charge accumulates on the front surface of the battery cell, and positive charge is extracted from the battery cell through the C electrode.

[0013] Electroplating equipment, based on the production of any of the above-mentioned back contact battery copper grid line AC electroplating process, comprising:

[0014] A frame, on which an electroplating tank is provided;

[0015] A turntable, which is rotatably connected to the frame;

[0016] A plurality of rotating racks, which are intermittently driven to rotate by the turntable;

[0017] A plurality of clamping mechanisms are respectively arranged on each rotating frame in a one-to-one correspondence; each clamping mechanism comprises two clamping claws;

[0018] A material rack is arranged on the frame, and multiple batteries are stacked up and down in the material rack;

[0019] The forward and reverse rotation strokes of the turntable include: clamping stroke, electroplating station, reset stroke, switching stroke, and material discharge station.

[0020] In the clamping stroke: the turntable rotates in the first direction, driving one of the clamping claws of the clamping mechanism closest to the material rack to move laterally and clamp the battery in the material rack. After clamping, the clamping claw maintains the clamping state of the battery and moves laterally away from the material rack to take the battery out of the rack;

[0021] At the electroplating station: the turntable continues to rotate in the first direction, and drives each rotating frame to rotate synchronously, driving the clamping mechanism clamping the battery to be rotated into the electroplating tank, and drives an adjacent clamping mechanism to be located at the clamping station;

[0022] In the reset stroke: the turntable rotates in the second direction;

[0023] In the switching stroke: the rotating disk rotates again in the first direction, driving the clamping claw of the battery in the same clamping mechanism to continue to loosen, and the other clamping claw to continue to clamp, so as to achieve switching clamping of the battery;

[0024] At the unloading station: the turntable continues to rotate in the first direction, driving a clamping claw that is clamping the battery to release the clamping state, so as to release the electroplated battery.

[0025] Furthermore, a plurality of through slots are provided on the turntable, and each rotating frame is fixedly connected with a cross bar, and each cross bar is slidably abutted against each through slot in a one-to-one correspondence.

[0026] Furthermore, the clamping mechanism also includes a rotating plate rotatably connected to the rotating frame, a rotating shaft is coaxially fixedly connected to the rotating plate, a slider is slidably connected to the rotating frame, a connecting rod is rotatably connected to the slider, an abutment rod is fixedly connected to the connecting rod, an abutment groove is provided on the rotating plate, the abutment rod is abutted and matched with the abutment groove, an avoidance groove is provided on the connecting rod, and the avoidance groove is abutted and matched with the rotating shaft.

[0027] Furthermore, the abutment groove is composed of a protruding section, a first coaxial section, a retracted section and a second coaxial section.

[0028] Furthermore, the clamping claw comprises two clamping plates which are coaxially rotatably connected to the slider, and an elastic member is arranged between the two clamping plates.

[0029] Furthermore, both ends of the rotating shaft are fixedly connected with an opening and closing member, and each opening and closing member includes two closing plates, and the two closing plates are respectively rotated and abutted against the two clamping plates corresponding thereto.

[0030] Furthermore, the clamping plate has a clamping inclined surface and a retaining inclined surface.

[0031] Furthermore, it also includes a driving mechanism, which includes a worm wheel coaxially fixedly connected to the rotating plate, a worm rotatably connected to the rotating frame, a pawl elastically provided on the worm, a ratchet rotatably connected to the worm, the pawl and the ratchet are snap-fitted together, a gear is fixedly connected to the ratchet, a rack is fixedly connected to the turntable, and the rack is meshingly fitted with the gear.

[0032] In the above technical solution, the present invention provides an AC electroplating process and electroplating equipment for back contact battery copper grid lines:

[0033] 1. By irradiating the cell with strong light during the copper grid electroplating, a large number of electrons and holes are stimulated in the cell, thereby reducing the resistance of the cell and greatly improving the efficiency of electroplating.

[0034] 2. Through the AC electroplating process, the uniform distribution of negative charge density in the electroplating area is achieved, which greatly improves the uniformity of the cross-sectional area size of the electroplated copper grid line.

[0035] 3. During the copper electroplating process of the battery through electroplating equipment, two clamps are set in the clamping mechanism, and the two clamps clamp the same battery alternately and switch the position of the clamped battery to avoid blocking the contact area between the battery and the clamping mechanism, which will cause the blocked position to be unable to be electroplated, thereby affecting the quality of subsequent battery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0037] Figure 1 A schematic diagram of a copper grid line AC electroplating process provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the overall structure of an electroplating device provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the structure of a turntable provided in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the overall structure of the rotating frame and the clamping mechanism provided in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the structure of a clamping mechanism and a driving mechanism provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of the exploded structure of the clamping mechanism provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of a partially enlarged structure provided by an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of the structure of a rotating plate provided in an embodiment of the present invention;

[0045] Fig. 9 A schematic diagram of the driving mechanism structure provided in an embodiment of the present invention.

[0046] Explanation of the reference numerals: 1. frame; 2. turntable; 21. through slot; 3. rotating frame; 31. cross bar; 4. clamping mechanism; 41. rotating plate; 411. extending section; 412. first coaxial section; 413. retracting section; 414. second coaxial section; 42. rotating shaft; 43. slider; 44. connecting rod; 441. avoidance groove; 45. abutting rod; 46. clamping claw; 461. clamping plate; 462. elastic member; 47. opening and closing plate; 471. clamping inclined plane; 472. holding inclined plane; 5. driving mechanism; 51. worm gear; 52. worm; 53. pawl; 54. ratchet; 55. gear; 56. rack; 6. material rack. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] See also Figure 1-9 , an AC electroplating process for a back contact battery copper grid provided by an embodiment of the present invention comprises the following steps:

[0049] S1. Graphicalization: Through the development process of photolithography technology, the area on the back of the cell that needs to be copper-plated is exposed, and copper foil is tied to the insulating anti-reflective film on the front of the cell;

[0050] S2.1, irradiation: During electroplating, strong light is used to irradiate the cell, which stimulates a large number of electrons and holes in the cell, thereby reducing the resistance of the cell and improving the electroplating efficiency;

[0051] S2.2, electroplating: while irradiating, the cell is placed in an electrolytic cell for electroplating, and copper ions are reduced by electrolytic chemical reaction and deposited on the exposed surface, thereby forming copper grid lines;

[0052] S2.3. Electrode connection: During irradiation and electroplating, electrode A is connected to the copper foil on the front side of the parallel cell, electrode B is connected to the electrolyte, and electrode C is connected to the back side of the cell. When the polarity of electrode A is negative, the polarity of electrode B is positive, and electrode C is powered off; conversely, when the polarity of electrode A is positive, electrode B is powered off, and electrode C is negative.

[0053] Specifically, when the polarity of the A electrode is negative, positive charges accumulate on the front surface of the cell, and negative charges accumulate on the back surface of the cell. The copper ions in the electrolyte capture the negative charges and convert them into copper elements, which are deposited as copper grid lines. On the contrary, when the polarity of the A electrode is positive, negative charges accumulate on the front surface of the cell, and positive charges are extracted from the cell through the C electrode. Through the AC electroplating process, the uniform distribution of the negative charge density in the electroplating area is achieved, which greatly improves the uniformity of the cross-sectional area size of the electroplated copper grid lines.

[0054] S3, post-processing: cleaning, drying and anti-oxidation treatment of the battery cells to ensure the quality and stability of the copper grid lines.

[0055] Preferably, a unidirectional conductive diode is used to access the electroplating circuit to implement the electrode connection scheme described in S2.3.

[0056] Preferably, after the patterning process is completed, the cell needs to be cleaned to remove the remaining photoresist and developer.

[0057] In the process of producing batteries, when electroplating the batteries, it is usually necessary to clamp the batteries with a fixture and place them in a plating tank to complete the electroplating. However, the position where the fixture and the battery contact each other cannot be electroplated due to the obstruction caused by clamping, thereby affecting the quality of the batteries produced subsequently. In order to solve the problem that the position clamped by the fixture can also be electroplated, it can be achieved by switching the clamping position of the battery. Please refer to the electroplating equipment below for details.

[0058] The electroplating equipment is based on the AC electroplating process for back-contact battery copper grid lines as described in any of the above items, comprising: a frame 1, on which a plating tank is opened; a plating liquid is arranged in the plating tank; a turntable 2, which is rotatably connected to the frame 1; a plurality of rotating frames 3, which are intermittently driven to rotate by the turntable 2; a plurality of clamping mechanisms 4, which are respectively arranged on each rotating frame 3 in a one-to-one correspondence; each clamping mechanism 4 includes two claws 46; a material rack 6, which is arranged on the frame 1, and a plurality of batteries are stacked up and down in the material rack 6.

[0059] Among them, in the embodiment of the present invention, it also includes a driving source (not shown in the figure), the driving source is a motor, the output shaft of the driving source is coaxially fixedly connected with the turntable 2, and the driving source can drive the turntable 2 to rotate forward and reverse.

[0060] Preferably, in an embodiment of the present invention, the material rack 6 includes a bottom plate, and vertical plates are fixedly connected at the four corners of the bottom plate, wherein notches are provided on the two vertical plates located on the same side, and the notches enable a battery located at the bottom of the material rack 6 to be smoothly moved out of the notches.

[0061] Further preferably, in an embodiment of the present invention, a pushing mechanism (not shown in the figure) is also included. The pushing mechanism is arranged on the frame 1. The pushing mechanism can be a cylinder, a rotation-converted-linear reciprocating motion mechanism, etc. The pushing mechanism is a prior art and will not be described in detail here. The function of the pushing mechanism is to push a battery located at the bottom of the rack 6 out from the notch position so that the clamping mechanism 4 can clamp the pushed-out battery.

[0062] Specifically, in an embodiment of the present invention, the structure in which the turntable 2 intermittently drives the rotating frame 3 to rotate is as follows: a plurality of through slots 21 are provided on the turntable 2, and each rotating frame 3 is fixedly connected with a cross bar 31, and each cross bar 31 is slidably abutted against each through slot 21 one by one.

[0063] Understandable: In the initial state, such as Figure 3 , 4 In the state shown, the cross bar 31 abuts against the inner wall of one end of the through slot 21. As the turntable 2 rotates, the cross bar 31 will move from one end of the through slot 21 to the other end. At this time, when the turntable 2 continues to rotate, the abutment between the cross bar 31 and the through slot 21 will drive the rotating frame 3 to rotate synchronously, that is, drive the clamping mechanisms 4 to rotate synchronously.

[0064] In the embodiment of the present invention: the clamping mechanism 4 also includes a rotating plate 41 rotatably connected to the rotating frame 3, and a rotating shaft 42 is coaxially fixedly connected to the rotating plate 41; wherein the rotating shaft 42 is coaxially fixedly connected to the rotating plate 41; a slider 43 is slidably connected to the rotating frame 3; specifically, a groove is provided on the slider 43, a guide rail is fixedly connected to the rotating frame 3, and the groove is slidably connected to the guide rail, so as to realize the sliding connection between the rotating frame 3 and the slider 43; a connecting rod 44 is rotatably connected to the slider 43, an abutting rod 45 is fixedly connected to the connecting rod 44, an abutting groove is provided on the rotating plate 41, and the abutting rod 45 abuts and cooperates with the abutting groove, and an avoidance groove 441 is provided on the connecting rod 44, and the avoidance groove 441 abuts and cooperates with the rotating shaft 42.

[0065] The abutment rod 45 is fixedly connected to the midpoint of the connecting rod 44 along the length direction, and the abutment rod 45 abuts against the abutment groove, so that the position of the abutment rod 45 is moved, and further one end of the abutment rod 45 drives the slider 43 to slide on the rotating frame 3, that is, drives the two clamping claws 46 to move, so that the clamping claws 46 complete the lateral movement of extending forward and retracting backward; it can be understood that: in order to avoid the interference problem between the other end of the connecting rod 44 and the rotating shaft 42 when the slider 43 slides on the rotating frame 3, and to ensure that the rotating shaft 42 can smoothly pass through the connecting rod 44, in an embodiment of the present invention, an avoidance groove 441 is opened on the connecting rod 44, such as Figure 6 In the state shown, when the rotating shaft 42 abuts against one end of the avoidance groove 441 shown in the figure, the clamping claw 46 is in the initial state, that is, it has not extended forward to move horizontally; when the rotating shaft 42 abuts against the other end of the avoidance groove 441, the slider 43 is driven to slide on the rotating frame 3, and the clamping claw 46 extends toward the position of the battery to prepare for the battery clamping work.

[0066] Specifically, Figure 6 , Fig. 9In the state shown, the rotating plate 41 rotates counterclockwise along its own axis; the abutment groove is composed of an extended section 411, a first coaxial section 412, a retracted section 413 and a second coaxial section 414; more specifically, when the extended section 411 abuts and cooperates with the abutment rod 45, the slider 43 is driven to slide on the rotating frame 3, that is, the clamping claw 46 extends toward the position where the battery is located; when the first coaxial section 412 abuts and cooperates with the abutment rod 45, the slider 43 is driven to maintain the current position on the rotating frame 3 unchanged, that is, the clamping claw 46 maintains the current position unchanged; when the retracted section 413 abuts and cooperates with the abutment rod 45, the slider 43 is driven to slide in the opposite direction on the rotating frame 3, that is, the clamping claw 46 is driven to retract and reset to the initial position; when the second coaxial section 414 abuts and cooperates with the abutment rod 45, the slider 43 remains stationary on the rotating frame 3, that is, the clamping claw 46 maintains the current position.

[0067] It can be understood that: as mentioned above, the extending section 411 is to make the clamping jaws 46 approach the location of the battery; and the retracting section 413 is to drive the clamping jaws 46 and the battery to move laterally synchronously after the clamping jaws 46 clamp the battery. The lateral movement stroke can enable the battery to be smoothly moved out of the rack 6, thereby avoiding the interference between the battery and the rack 6 when the clamping jaws 46 rotate with the rotating rack 3, thereby causing damage to the battery because the clamping jaws 46 have already clamped the battery.

[0068] Specifically, the clamping claw 46 includes two clamping plates 461 coaxially rotatably connected to the slider 43, and an elastic member 462 is arranged between the two clamping plates 461; the elastic member 462 is a compression spring; when the elastic member 462 undergoes elastic deformation and contracts, the ends of the two clamping plates 461 close to the battery approach each other to complete the clamping action.

[0069] Preferably, both ends of the rotating shaft 42 are fixedly connected with a tensioning and closing member; the tensioning and closing member is coaxially fixedly connected to the rotating shaft 42; each tensioning and closing member includes two clamping plates 47; specifically, the two clamping plates 47 are distributed in a circular array with the axis of the rotating shaft 42 as the center; the angle between the two clamping plates 47 is one hundred and eighty degrees; the two clamping plates 47 are respectively rotated and abutted against their corresponding two clamping plates 461 in a one-to-one correspondence.

[0070] When the opening and closing parts rotate, the two clamping plates 461 are driven to rotate around the rotation axis of the slider 43, and the distance between the same ends of the two clamping plates 461 is gradually expanded, and the distance between the other ends is gradually reduced, thereby completing the clamping action of the battery; wherein, there is also a certain angle between the two opening and closing parts at both ends of the rotating shaft 42; through the setting of the angle, when the rotating shaft 42 rotates, one of the clamping claws 46 first completes the clamping action, and then the other clamping claw 46 performs clamping, thereby realizing alternating clamping of the battery and changing the clamping position.

[0071] Specifically, the opening and closing plate 47 is provided with a clamping inclined surface 471 and a retaining inclined surface 472; wherein the clamping inclined surface 471 cooperates with the first coaxial section 412, that is, after the clamping jaw 46 extends forward, through the rotation of the opening and closing plate 47, when the clamping inclined surface 471 abuts against the clamping plate 461, the two clamping plates 461 are driven to rotate so that the clamping jaw 46 completes the clamping; it must be noted that: by retaining the inclined surface 472 abutting against the clamping plate 461, one of the clamping jaws 46 can always maintain a clamping state until the other clamping jaw 46 completes the clamping state, that is, the two clamping jaws 46 clamp the battery at the same time. At this time, as the rotating shaft 42 drives the two opening and closing plates 47 to rotate, the retaining inclined surface 472 is disengaged from the clamping plate 461, that is, the one clamping jaw 46 releases the battery, while the other clamping jaw 46 is still in a state of clamping the battery.

[0072] Preferably, one end clamped by the two clamping plates 461 is elastically connected with a buffer plate (not shown in the figure). The reason is that when the retraction section 413 cooperates with the abutment rod 45, the clamping jaw 46 slides horizontally to reset, but at this time, the two clamping plates 461 of the clamping jaw 46 will be inclined with the retaining inclined surface 472 of the tensioning member. The process of the clamping jaw 46 sliding horizontally will make the two clamping plates 461 used to clamp one end of the battery tighter, and the elastically arranged buffer plate can prevent the battery from being damaged.

[0073] like Figure 5 In the state shown, the clamping mechanism 4 clamps the battery at the clamping station and rotates ninety degrees to the electroplating tank for electroplating, and completes the alternating clamping of the battery during the process. After the clamping mechanism 4 rotates one hundred and eighty degrees, the two jaws 46 in the clamping mechanism 4 release the battery, and the battery is then taken away and collected by a robot. The robot is a prior art and will not be described in detail here. Immediately following the above, after the clamping mechanism 4 rotates one hundred and eighty degrees again, that is, when it is located at the clamping station again, the clamping mechanism 4 returns to the initial state again. During its second rotation of one hundred and eighty degrees, the two jaws 46 complete the clamping action and complete the alternating clamping. When it is rotated to the clamping station, the two jaws 46 remain consistent with the initial state. In general, the clamping mechanism 4 completes the alternating clamping and the releasing action of the two jaws 46 on the battery during each rotation of one hundred and eighty degrees. Each one hundred and eighty degrees is a cycle.

[0074] It also includes a driving mechanism 5, which is used to drive the rotating plate 41 to rotate; it includes a worm wheel 51 coaxially fixedly connected to the rotating plate 41, a worm 52 rotatably connected to the rotating frame 3, a pawl 53 elastically provided on the worm 52, a ratchet 54 rotatably connected to the worm 52, the pawl 53 and the ratchet 54 snap-fitted, a gear 55 fixedly connected to the ratchet 54, a rack 56 fixedly connected to the turntable 2, and the rack 56 meshes with the gear 55.

[0075] By the engagement between the pawl 53 and the ratchet 54 and the meshing between the rack 56 and the gear 55 , the gear 55 only drives the worm 52 to rotate in the same direction, that is, the rotating plate 41 always rotates counterclockwise with its own axis as the center.

[0076] The forward and reverse rotation strokes of the turntable 2 sequentially include: a clamping stroke, an electroplating station, a reset stroke, a switching stroke, and a material discharge station.

[0077] In the clamping stroke: the turntable 2 rotates in the first direction, driving one of the clamping jaws 46 of the clamping mechanism 4 closest to the rack 6 to move laterally and clamp the battery in the rack 6. After clamping, the clamping jaw 46 maintains the clamping state of the battery and moves laterally away from the rack 6 to take the battery out of the rack 6;

[0078] At the electroplating station: the turntable 2 continues to rotate in the first direction, and drives each rotating frame 3 to rotate synchronously, driving the clamping mechanism 4 clamping the battery to be rotated into the electroplating tank, and drives an adjacent clamping mechanism 4 to be located at the clamping station;

[0079] In the reset stroke: the turntable 2 rotates along the second direction;

[0080] In the switching stroke: the rotating disk 2 rotates again in the first direction, driving the clamping jaw 46 of the same clamping mechanism 4 that clamps the battery to continue to loosen, and the other clamping jaw 46 continues to clamp, so as to realize the switching clamping of the battery;

[0081] At the unloading station: the turntable 2 continues to rotate in the first direction, driving the clamping claw 46 that is clamping the battery to release the clamping state, so as to release the electroplated battery.

[0082] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A back contact battery copper grid line AC electroplating process, characterized in that: The following steps are involved: S1. Graphicalization: Through the development process of photolithography technology, the area on the back of the cell that needs to be copper-plated is exposed, and copper foil is tied to the insulating anti-reflective film on the front of the cell; S2.1, irradiation: During electroplating, strong light is used to irradiate the cell, which stimulates a large number of electrons and holes in the cell, thereby reducing the resistance of the cell and improving the electroplating efficiency; S2.2, electroplating: while irradiating, the cell is placed in an electrolytic cell for electroplating, and copper ions are reduced by electrolytic chemical reaction and deposited on the exposed surface, thereby forming copper grid lines; S2.3, electrode connection: During irradiation and electroplating, electrode A is connected to the copper foil on the front side of the parallel cell, electrode B is connected to the electrolyte, and electrode C is connected to the back side of the cell. When the polarity of electrode A is negative, the polarity of electrode B is positive, and electrode C is powered off; Conversely, when the polarity of electrode A is positive, electrode B is powered off, and the polarity of electrode C is negative; S3, post-processing: cleaning, drying and anti-oxidation treatment of the battery cells to ensure the quality and stability of the copper grid lines.

2. The back contact battery copper grid line AC electroplating process according to claim 1, characterized in that: When the polarity of electrode A is negative, positive charge accumulates on the front surface of the battery cell, and negative charge accumulates on the back surface of the battery cell. The copper ions in the electrolyte capture the negative charge and convert it into copper element and deposit it as copper grid lines. Conversely, when the polarity of electrode A is positive, negative charge accumulates on the front surface of the battery cell, and positive charge is extracted from the battery cell through electrode C.

3. An electroplating device, which is based on the back contact battery copper grid line AC electroplating process according to any one of claims 1-2, characterized in that: include: A frame (1) having an electroplating tank disposed thereon; A turntable (2) rotatably connected to the frame (1); A plurality of rotating racks (3) which are intermittently driven to rotate by the rotating disk (2); A plurality of clamping mechanisms (4) are respectively arranged on each rotating frame (3) in a one-to-one correspondence; each clamping mechanism (4) comprises two clamping claws (46); A material rack (6), which is arranged on the frame (1), and a plurality of batteries are stacked up and down in the material rack (6); The forward and reverse rotation strokes of the turntable (2) sequentially include: a clamping stroke, an electroplating station, a reset stroke, a switching stroke, and a material discharge station; In the clamping stroke: the turntable (2) rotates in a first direction, driving one of the clamping claws (46) of the clamping mechanism (4) closest to the material rack (6) to move laterally and clamp the battery in the material rack (6); after clamping, the clamping claw (46) maintains the clamping state of the battery and moves laterally away from the material rack (6) to remove the battery from the material rack (6); At the electroplating station: the turntable (2) continues to rotate in the first direction, and drives each rotating frame (3) to rotate synchronously, driving the clamping mechanism (4) clamping the battery to be rotated into the electroplating tank, and drives an adjacent clamping mechanism (4) to be located at the clamping station; In the reset stroke: the turntable (2) rotates in the second direction; In the switching stroke: the rotating disk (2) rotates again in the first direction, driving the clamping claw (46) of the same clamping mechanism (4) that clamps the battery to continue to loosen, and the other clamping claw (46) to continue to clamp, so as to achieve switching clamping of the battery; At the unloading station: the turntable (2) continues to rotate in the first direction, driving a clamping claw (46) that is clamping the battery to release the clamping state, so as to release the electroplated battery.

4. The electroplating equipment according to claim 3, characterized in that: A plurality of through slots (21) are provided on the rotating disk (2), and each rotating frame (3) is fixedly connected with a cross bar (31), and each cross bar (31) is slidably abutted against each through slot (21) in a one-to-one correspondence.

5. The electroplating equipment according to claim 3, characterized in that: The clamping mechanism (4) further comprises a rotating plate (41) rotatably connected to the rotating frame (3); a rotating shaft (42) is coaxially fixedly connected to the rotating plate (41); a slider (43) is slidably connected to the rotating frame (3); a connecting rod (44) is rotatably connected to the slider (43); an abutment rod (45) is fixedly connected to the connecting rod (44); an abutment groove is provided on the rotating plate (41); the abutment rod (45) abuts against the abutment groove; an avoidance groove (441) is provided on the connecting rod (44); the avoidance groove (441) abuts against the rotating shaft (42).

6. The electroplating equipment according to claim 5, characterized in that: The abutment groove is composed of a protruding section (411), a first coaxial section (412), a retracting section (413) and a second coaxial section (414) which are connected.

7. The electroplating equipment according to claim 5, characterized in that: The clamping jaw (46) comprises two clamping plates (461) coaxially rotatably connected to the slider (43), and an elastic member (462) is arranged between the two clamping plates (461).

8. The electroplating equipment according to claim 7, characterized in that: Both ends of the rotating shaft (42) are fixedly connected with a stretching and closing member, each of which comprises two clamping plates (47), and the two clamping plates (47) are respectively rotatably abutted against the two clamping plates (461) corresponding thereto.

9. The electroplating equipment according to claim 8, characterized in that: The clamping plate (47) is provided with a clamping inclined surface (471) and a retaining inclined surface (472).

10. The electroplating equipment according to claim 5, characterized in that: The invention also comprises a driving mechanism (5), which comprises a worm wheel (51) coaxially fixedly connected to the rotating plate (41), a worm (52) rotatably connected to the rotating frame (3), a ratchet (53) elastically provided on the worm (52), a ratchet wheel (54) rotatably connected to the worm (52), the ratchet (53) and the ratchet wheel (54) being engaged with each other, a gear (55) being fixedly connected to the ratchet wheel (54), a rack (56) being fixedly connected to the rotating disk (2), and the rack (56) and the gear (55) being engaged with each other.

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