Coating device, coating system and copper electroplating method for battery cell

Abstract

A coating device, a coating system and a copper electroplating method for a cell, belonging to the field of photovoltaic technology. The copper electroplating method for a cell comprises: obtaining a pre-treated cell provided with a copper seed layer, using a coating system to make the pre-treated cell pass through a purging section, a spraying section and a drying section in sequence through a conveying mechanism, and then directly placing the pre-treated cell on a printing table; coating the pre-treated cell on the printing table with a photosensitive adhesive, and then exposing, developing and electroplating. The coating system provided in the present application is used to coat the cell. Before coating, the cell is sequentially subjected to nitrogen purging for dust removal, acid washing for decontamination and drying, and then the dried cell is directly transferred to the printing table for coating, which can reduce impurities on the surface of the pre-treated cell on the printing table, improve the coating quality, and reduce the probability of broken gates in the metal grid line electrodes formed after the subsequent electroplating process.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a coating device, a coating system and a copper electroplating method for a cell. Background Art

[0002] The preparation process of photovoltaic cells includes the preparation of metal electrodes. Currently, the preparation methods of metal electrodes include screen printing and copper electroplating.

[0003] Silver paste is a key raw material for preparing metal electrodes for photovoltaic cells by screen printing. It is a viscous paste composed of a mechanical mixture of high-purity (99%) silver powder, glass oxide, organic materials, etc. The consumption of silver paste is large when preparing metal electrodes by screen printing, which increases the production cost of solar cells.

[0004] Copper electroplating is a non-contact electrode metallization technology that deposits copper on the surface of the base metal through electrolysis to make copper grid lines and collect carriers generated by the photovoltaic effect. In order to solve the contact and adhesion problems between electroplated copper and transparent conductive film (TCO), a very thin copper seed layer must be plated using PVD equipment to connect the preceding TCO and the subsequent electroplated copper.

[0005] In the current copper electroplating technology, the process flow is as follows: copper seed layer plating → coating (front or back) → drying → coating (back or front) → drying → printing → developing → electroplating → film removal. After electroplating copper using the existing preparation process, the metal grid line electrode formed often has a broken grid, which affects the electrical performance of the battery cell. Summary of the invention

[0006] Based on the above-mentioned deficiencies, the present application provides a coating device, a coating system and a copper electroplating method for a battery cell, so as to partially or completely improve the problem of copper electroplating broken grid in the related art.

[0007] This application is implemented as follows:

[0008] In a first aspect, an example of the present application provides a coating device, comprising:

[0009] The cleaning mechanism comprises a purge section, a spray section and a drying section which are arranged in sequence; the purge section is provided with a first nozzle for purging nitrogen gas to the battery cell; the spray section is provided with a first cleaning tank and a second nozzle, and the second nozzle is configured to spray pickling liquid to the first cleaning tank; the drying section is configured to dry the battery cell after being sprayed by the spray section;

[0010] The coating mechanism includes a printing table, which is directly connected to the rear end of the drying section;

[0011] Conveying mechanism: The conveying mechanism is equipped to convey the battery cells through the blowing section, the spraying section and the drying section to the printing table in sequence.

[0012] In the above implementation process, a purging section, a spraying section and a drying section are sequentially arranged, and the battery cells to be processed can be placed on a conveying mechanism. Under the action of the conveying mechanism, the battery cells to be coated are sequentially passed through the purging section for nitrogen purging, passed through the spraying section for acid washing, passed through the drying section for drying, and then directly conveyed to the printing table for gluing.

[0013] The coating device provided in this example is used for coating. Before the battery cell enters the printing station, the battery cell will be sequentially purged with nitrogen by the purging section and acid-washed by the spraying section, so that dust and other impurities and oil and other adhesives on the surface of the battery cell can be removed. In addition, the printing station is directly set at the rear end of the drying section. After the impurities and adhesives on the surface of the battery cell are removed by purging and washing, the cleaned and dried battery cell can be coated with glue in time, further reducing the probability of re-attachment of impurities during the transportation of the battery cell and reducing the impurities between the glue layer and the copper seed layer after coating.

[0014] In combination with the first aspect, in a first possible implementation manner provided in the first aspect of the present application, the spraying portion further includes a second cleaning tank disposed at the rear end of the first cleaning tank, and a third nozzle disposed at the second cleaning tank; the third nozzle is configured to spray water washing liquid into the second cleaning tank.

[0015] In the above implementation process, a second cleaning tank is arranged at the rear end of the first cleaning tank, and a third nozzle is arranged at the second cleaning tank, so that the battery cells after pickling in the first cleaning tank can be washed with water to remove the pickling liquid remaining in the battery cells.

[0016] In combination with the first aspect, in a second possible implementation manner provided in the first aspect of the present application, the drying section includes a drying tank arranged at the rear end of the second cleaning tank, and a fourth nozzle arranged in the drying tank; the fourth nozzle is configured to blow drying gas into the drying tank.

[0017] In the above implementation process, a drying tank is provided at the rear end of the second cleaning tank, which can dry the washed battery cells and remove water stains on the surface of the battery cells. In addition, a fourth nozzle for blowing drying gas is provided in the drying tank, which can dry the battery cells placed in the drying tank and further remove dust and other impurities attached to the surface of the battery cells during transportation.

[0018] In combination with the first aspect, in a third possible implementation manner provided in the first aspect of the present application, the purge portion further includes a purge tank, and the purge tank, the first cleaning tank, the second cleaning tank and the drying tank are connected in sequence.

[0019] In the above implementation process, the purge tank, the first cleaning tank, the second cleaning tank and the drying tank are connected in sequence, so that the battery cells to be coated with glue can pass through the purge tank in sequence to be purged with nitrogen, and then directly enter the first cleaning tank from the channel connecting the purge tank and the first cleaning tank for acid washing; then directly enter the second cleaning tank from the channel connecting the first cleaning tank and the second cleaning tank for water washing; then directly enter the drying tank from the channel connecting the second cleaning tank and the drying tank for drying.

[0020] By providing a purge tank, a first cleaning tank, a second cleaning tank and a drying tank that are connected in sequence, the battery cells can be directly transported from the tank body of the previous processing section to the tank body of the next processing section, reducing the probability of impurities re-attaching to the battery cells during the process of entering and exiting the corresponding tank body.

[0021] In combination with the first aspect, in a fourth possible implementation manner provided in the first aspect of the present application, the conveying mechanism includes a chain roller conveyor, and the chain roller conveyor extends from the purge slot to the printing table.

[0022] In the above implementation process, the chain roller conveyor is extended from the purge tank to the printing table, the battery cells can be placed on the chain roller conveyor, and then transported by the chain roller conveyor to the purge tank for nitrogen purging and ash removal, and then directly transported to the first cleaning tank from the channel connecting the purge tank and the first cleaning tank for acid washing and decontamination, and then directly transported to the second cleaning tank from the channel connecting the first cleaning tank and the second cleaning tank for water washing, and then directly enter the drying tank from the channel connecting the second cleaning tank and the drying tank for drying to remove water stains, and then transported to the printing table directly connected to the rear end of the drying tank for glue coating, which can further reduce impurities in the battery cells transported to the printing table.

[0023] The chain conveyor passes through the sequentially connected purge tank, the first cleaning tank, the second cleaning tank and the drying tank to reach the printing table, which can prevent the battery cells from entering and exiting the corresponding cleaning tanks and contacting impurities outside the cleaning tanks.

[0024] In combination with the first aspect, in the fifth possible implementation manner provided in the first aspect of the present application, the first nozzle, the second nozzle, the third nozzle and the fourth nozzle reciprocate in the corresponding trough body along a preset direction through a connecting member; the preset direction intersects with the extension direction of the chain roller conveyor.

[0025] In the above implementation process, the first nozzle, the second nozzle, the third nozzle and the fourth nozzle reciprocate in the corresponding trough body along the preset direction through the connecting piece, and the preset direction intersects with the extension direction of the chain roller conveyor. The battery cell can be blown, sprayed or dried along the length direction of the chain roller conveyor, and the battery cell can also be blown, sprayed or dried in the width direction perpendicular to the conveying direction. The corresponding reciprocating operations such as blowing, spraying or drying can be performed, which can further improve the cleaning effect.

[0026] In combination with the first aspect, in the sixth possible embodiment provided in the first aspect of the present application, the coating device also includes a feeding mechanism; the feeding mechanism includes a reflux groove connected to the liquid of the first cleaning tank; the reflux groove is connected to the second nozzle for spraying the pickling liquid in the reflux groove into the first cleaning tank.

[0027] In the above implementation process, a reflux tank connected to the first cleaning tank is provided, and the pickling liquid after cleaning can be collected through the reflux tank and re-input into the second nozzle to rinse the battery cell again, so as to reuse the pickling liquid and reduce the cleaning cost.

[0028] In a second aspect, an example of the present application provides a coating system, comprising:

[0029] The coating device provided by the first aspect;

[0030] A nitrogen gas storage tank and a CDS liquid supply machine; the nitrogen gas storage tank is connected to the first nozzle, and the CDS liquid supply machine is equipped to deliver pickling liquid to the second nozzle.

[0031] In the above implementation process, nitrogen is delivered to the first nozzle using a nitrogen storage tank, and pickling liquid is delivered to the second nozzle using a CDS liquid supply machine, so that the battery cell before coating can be purged, dusted and pickled to remove dirt, thereby reducing impurities between the glue layer and the copper seed layer after coating.

[0032] In addition, a drying section directly connected to the front end of the printing table is provided in the coating device, so that the cleaned and dried battery cells can be coated with glue in time, which can reduce the probability of re-adherence of impurities to the cleaned battery cells.

[0033] In a third aspect, an example of the present application provides a copper electroplating method for a battery cell, comprising:

[0034] Obtaining a pre-treated cell provided with a copper seed layer;

[0035] Using the coating system provided in the second aspect, the pre-treated battery sheet is passed through the purging section, the spraying section and the drying section in sequence through the conveying mechanism, and then directly placed on the printing table;

[0036] The pre-treated cell on the printing table is coated with photosensitive adhesive, and then exposed, developed and electroplated.

[0037] In the above implementation process, the coating system provided by the second aspect is used to make the pre-treated battery cells pass through the conveying mechanism in turn through the purging section for nitrogen purging and dust removal and through the first cleaning tank for acid washing and decontamination, and then dry in the drying section to remove water stains. The dried battery cells are directly placed on the printing table directly connected to the rear end of the drying section for glue coating. This can avoid the dried battery cells being loaded with flower baskets and transported to the coating device through intermediate conveying devices such as running carts, thereby reducing impurities between the glue layer and the copper seed layer, reducing the probability of broken gates formed after the subsequent electroplating process, and improving the electrical properties of copper electroplated battery cells.

[0038] In combination with the third aspect, in a first possible implementation manner provided in the third aspect of the present application, the nitrogen purge pressure of the first nozzle is 3 bar-6 bar; the pickling liquid in the second nozzle includes a sulfuric acid solution with a mass concentration of 0.1%-2%.

[0039] In the above implementation process, the battery cell is purged using the first nozzle with a purging pressure of 3bar-6bar, which can improve the efficiency of the first nozzle in removing dust and other particulate impurities in the copper seed layer of the battery cell; and the battery cell is sprayed with a 0.1%-2% concentration of sulfuric acid solution, which can further increase the effect of removing adhesives on the surface of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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 or the description of the prior art are briefly introduced below.

[0041] Figure 1 It is a schematic diagram of the process before coating in the prior art;

[0042] Figure 2 A top view of a coating system provided for an example of this application;

[0043] Figure 3 A cross-sectional view of a coating apparatus provided as an example of the present application.

[0044] icon:

[0045] 1- coating system; 10- coating device; 11- cleaning mechanism; 111- blowing part; 1111- first nozzle; 1112- blowing tank; 112- spraying part; 1121- first cleaning tank; 1122- second nozzle; 1123- second cleaning tank; 1124- third nozzle; 113- drying part; 1131- drying tank; 1132- fourth nozzle; 114- connecting piece; 12- coating mechanism; 121- printing table; 13- conveying mechanism; 14- feeding mechanism; 141- reflux tank; 20- nitrogen gas storage tank; 30- CDS liquid supply machine;

[0046] 2-seed layer electroplating table; 3-flower basket; 4-transmission belt; 5-transport trolley; 6-coating machine. DETAILED DESCRIPTION

[0047] The embodiments of the present application will be described in detail below in conjunction with the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be considered to limit the scope of the present application. If no specific conditions are specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer.

[0048] The following is a specific description of the coating device, coating system and copper electroplating method for a battery cell provided in the example of this application:

[0049] Copper electroplating is a non-contact electrode metallization technology that deposits copper on the surface of the base metal through electrolysis to make copper grid lines and collect carriers generated by the photovoltaic effect. In order to solve the contact and adhesion problems between the electroplated copper and the transparent conductive film, a very thin copper seed layer must be plated using PVD equipment to connect the previous transparent conductive film and the subsequent electroplated copper.

[0050] In the current copper electroplating technology for photovoltaic cells, the process of patterning is as follows: copper seed layer plating → coating (front or back) → drying → coating (back or front) → drying → printing → developing → electroplating → film removal. When copper is electroplated using the existing preparation process, the metal grid electrode formed often has a broken grid, which affects the electrical performance of the cell.

[0051] The inventor analyzed the reasons for the occurrence of broken gates and believed that in some existing production processes, please refer to Figure 1 , the battery cell is placed on the seed layer electroplating station 2 to prepare a copper seed layer, and then the battery cell after the copper seed layer is plated is loaded into the flower basket 3, and after the intermediate transportation process such as the transmission belt 4 and the transport trolley 5, the battery cell is transferred to the coating machine 6 for glue coating. During the transfer in the intermediate process, it will contact the copper seed layer of the battery cell, resulting in impurities such as dust and adhesion such as oil stains between the glue and the copper seed layer of the battery cell during coating. After entering the subsequent electroplating process, foreign matter will be attached between the electroplated copper and the copper seed layer, resulting in broken grids of the battery cell, which reduces the electrical performance of the battery cell.

[0052] Based on this, see Figure 2 The inventor provides a coating system 1 and a coating device 10 . The coating system 1 includes the coating device 10 .

[0053] Wherein, the coating device 10 comprises:

[0054] The cleaning mechanism 11 includes a purge section 111, a spray section 112 and a drying section 113 which are arranged in sequence; the purge section 111 is provided with a first nozzle 1111 for purging nitrogen gas to the battery cell; the spray section 112 is provided with a first cleaning tank 1121 and a second nozzle 1122, and the second nozzle 1122 is configured to spray a pickling solution to the first cleaning tank 1121; the drying section 113 is configured to dry the battery cell after being sprayed by the spray section 112;

[0055] The coating mechanism 12 includes a printing table 121, and the printing table 121 is directly connected to the rear end of the drying section 113;

[0056] Conveying mechanism 13 ; The conveying mechanism 13 is configured to convey the battery cells sequentially through the blowing section 111 , the spraying section 112 and the drying section 113 to the printing table 121 .

[0057] A cleaning mechanism 11 and a coating mechanism 12 are provided in the coating device 10 . Before the coating mechanism 12 is used to coat the battery cell with the copper seed layer, the cleaning mechanism 11 in the coating device 10 can be used to clean the battery cell.

[0058] In addition, a purging section 111, a spraying section 112 and a drying section 113 are sequentially arranged in the cleaning mechanism 11, and the conveying mechanism 13 can make the battery cells after the copper seed layer is plated pass through the purging section 111 for purging and dust removal and pass through the first cleaning tank 1121 for pickling and decontamination, and then be conveyed to the drying section 113 for drying, and then be conveyed to the printing table 121 directly connected to the rear end of the drying section 113 for glue coating, which can avoid the battery cells after drying from intermediate transportation processes such as basket loading, transport carts, and transmission belts, and further reduce impurities on the surface of the copper seed layer of the battery cells on the printing table 121.

[0059] In the copper electroplating process of the battery cell, the battery cell can be first placed on the seed layer plating table 2 to plate the copper seed layer, and then the battery cell after the copper seed layer is plated is loaded into the flower basket 3, and transported to the coating device 10 provided in this example through conveying devices such as the transmission belt 4 and the transport trolley 5, and then the conveying mechanism 13 in the coating device 10 provided in this example is used to blow dust, pickle and clean, dry and coat the battery cell in sequence.

[0060] That is, the coating process in the prior art is: copper plating seed layer→transfer→coating. The coating process using the coating device provided in this example is: copper plating seed layer→transfer→cleaning and coating.

[0061] By using the coating device 10 provided in this example, the battery cells after copper seed layer plating can be cleaned, and then the cleaned battery cells can be directly transported to the printing table 121 for glue coating, thereby preventing the cleaned battery cells from re-attaching impurities during the intermediate transportation process such as transportation using the flower basket 3, reducing the impurities between the subsequent glue layer and the copper seed layer after coating, and improving the electrical performance of the battery cells.

[0062] The coating device 10 provided by the example of the present application is further described in detail below in conjunction with the accompanying drawings.

[0063] See also Figure 2 and Figure 3 The cleaning mechanism 11 includes a purging section 111, a spraying section 112 and a drying section 113 which are arranged in sequence; the purging section 111 is provided with a first nozzle 1111 for purging nitrogen to the battery cell; the spraying section 112 is provided with a first cleaning tank 1121 and a second nozzle 1122, and the second nozzle 1122 is configured to spray pickling liquid to the first cleaning tank 1121; the drying section is configured to dry the battery cell after being sprayed by the spraying section 112.

[0064] The present application does not limit the specific configuration of the purge unit 111, and relevant personnel may make corresponding adjustments as needed.

[0065] In some possible implementations, the purge portion 111 further includes a purge slot 1112 for accommodating battery cells, and the first nozzle 1111 purges nitrogen into the purge slot 1112 to remove impurities such as particles on the surface of the battery cells placed in the purge slot 1112 .

[0066] Alternatively, the purging unit 111 includes a placement plate for placing battery cells, and the first nozzle 1111 is disposed above the placement plate, and the battery cells are placed on the placement plate for purging and dust removal.

[0067] Furthermore, the present application does not limit the specific arrangement of the first nozzle 1111. In some possible implementations, the first nozzle 1111 includes a plurality of nozzles arranged at intervals.

[0068] The present application does not limit the specific configuration of the spraying part 112. In some possible implementations, the spraying part 112 further includes a second cleaning tank 1123 disposed at the rear end of the first cleaning tank 1121, and a third nozzle 1124 disposed in the second cleaning tank. The third nozzle 1124 can spray water washing liquid into the second cleaning tank 1123 to wash the battery cells after being pickled with the pickling liquid, so as to prevent the pickling liquid from remaining in the battery cells.

[0069] Further, the present application does not limit the specific configuration of the second nozzle 1122 and the third nozzle 1124, and relevant personnel can make corresponding selections as needed. Exemplarily, the second nozzle 1122 and the third nozzle 1124 each include a plurality of nozzles disposed at intervals to simultaneously rinse multiple locations of the battery cell.

[0070] Alternatively, the second nozzle 1122 and the third nozzle 1124 may be arranged at intervals in the first cleaning tank 1121, and the second nozzle 1122 may be opened for pickling or the third nozzle 1124 may be opened for water washing. However, if the second nozzle 1122 and the third nozzle 1124 are arranged in the first cleaning tank 1121 at the same time, the pickling liquid and the water washing liquid sprayed by the second nozzle 1122 and the third nozzle 1124 will mix in the first cleaning tank 1121, which is not conducive to the recycling of the pickling liquid or the water washing liquid.

[0071] Furthermore, in order to facilitate the reuse of the pickling solution, the coating device 10 provided in this example also includes a feeding mechanism 14. The feeding mechanism 14 includes a reflux tank 141, which is connected to the first cleaning tank 1121, so that the pickling solution in the first cleaning tank 1121 flows into the reflux tank 141 for collection. The reflux tank 141 is connected to the second nozzle 1122, so that the pickling solution in the reflux tank 141 flows to the second nozzle 1122, and the battery cells in the first cleaning tank 1121 are sprayed from the second nozzle 1122.

[0072] Furthermore, a water pump may be used to pump the pickling liquid in the reflux tank 141 back to the second nozzle 1122 .

[0073] Furthermore, a filter screen may be provided at the bottom of the first cleaning tank 1121 to filter the pickling liquid in the first cleaning tank 1121 , and then the filtered pickling liquid flows into the reflux tank 141 .

[0074] Furthermore, a pickling liquid feeder or a liquid storage tank may be connected to the reflux tank 141 , and when the pickling liquid in the reflux tank 141 is insufficient or the pickling liquid in the reflux tank 141 is replaced, new pickling liquid is added to the reflux tank 141 and then input into the second nozzle 1122 .

[0075] Furthermore, the reflux mechanism 14 may also be provided with a second reflux groove, which connects the second reflux groove with the second cleaning groove 1123, collects the washing liquid in the second cleaning groove 1123, and then transports the washing liquid in the second reflux groove to the third nozzle 1124 to reuse the washing liquid.

[0076] The present application does not limit the specific configuration of the drying section 113 . In some possible implementations, the drying section 113 includes a drying tank 1131 and a fourth nozzle 1132 disposed in the drying tank 1131 .

[0077] The fourth nozzle 1132 is used to blow drying gas (such as hot air) into the drying tank 1131, which can not only dry the water stains on the surface of the battery cell, but also blow the battery cell a second time to further remove impurities on the surface of the battery cell.

[0078] Alternatively, a heating element may be provided in the drying tank 1131 to dry the battery cells in the drying tank 1131. The heating element may be a resistance wire.

[0079] Furthermore, in order to facilitate the arrangement of the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131, the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131 can be arranged in a "one" shape, and the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131 are connected in sequence.

[0080] Furthermore, in order to facilitate the conveying mechanism 13 to convey the battery cells through the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131 in sequence and then to the printing table 121, the conveying mechanism 13 can be set as a chain roller conveyor. The chain roller conveyor extends from the purge tank 1112 to the printing table 121.

[0081] Furthermore, the chain roller conveyor passes through the channel connecting the purge tank 1112 with the first cleaning tank 1121, then passes through the channel connecting the first cleaning tank 1121 with the second cleaning tank 1123, then passes through the drying tank 1131 from the channel connecting the second cleaning tank 1123 with the drying tank 1131, and finally passes out from the drying tank 1131 to the printing table 121, and directly conveys the battery cells to the printing table 121.

[0082] Furthermore, in order to increase the cleaning effect of the battery cell in the width direction perpendicular to the conveying direction, the first nozzle 1111, the second nozzle 1122, the third nozzle 1124 and the fourth nozzle 1132 can be reciprocated in the corresponding trough body along a preset direction through the connecting member 114; the preset direction intersects with the extension direction of the chain roller conveyor.

[0083] The present application does not limit the specific arrangement form of the connecting member 114. In some possible embodiments, the connecting member 114 includes a connecting rod arranged along the extension direction of the chain roller conveyor. The connecting rod is arranged above the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131. A reciprocating member is respectively arranged at the position of the connecting rod corresponding to the position above the purge tank 1112, the first cleaning tank 1121, the second cleaning tank 1123 and the drying tank 1131, and the reciprocating member reciprocates along the extension direction perpendicular to the chain roller conveyor. The first nozzle 1111, the second nozzle 1122, the third nozzle 1124 and the fourth nozzle 1132 are respectively installed at the corresponding reciprocating members, so that the first nozzle 1111, the second nozzle 1122, the third nozzle 1124 and the fourth nozzle 1132 can reciprocate independently. The reciprocating member can be a screw reciprocating structure, the extension direction of the screw is perpendicular to or intersecting with the extension direction of the chain roller conveyor, and the reciprocating motion range of the screw does not exceed the width of the corresponding trough body (the width is the vertical length of the trough body along the extension direction of the chain roller conveyor).

[0084] The coating mechanism 12 includes a printing table 121, and the printing table 121 is used to place the battery cell for coating.

[0085] The printing table 121 is disposed on a side of the drying tank 1131 away from the second cleaning tank 1123 .

[0086] Furthermore, the surface of the printing table 121 for placing the battery cells is flush with the surface of the chain roller conveyor for conveying the battery cells, so that the battery cells on the chain roller conveyor can be directly fed onto the printing table 121 when being transferred out of the drying tank 1131 .

[0087] The present application does not limit the specific configuration of the coating mechanism 12 , and relevant personnel can make corresponding adjustments as needed. Exemplarily, the coating mechanism also includes a brush head disposed above the printing table 121 to facilitate coating the photosensitive adhesive on the battery cell on the printing table 121 .

[0088] The coating system 1 provided in the present application further includes a nitrogen gas storage tank 20 and a CDS liquid supply machine 30 (Control and Dynamical System, CDS). The nitrogen gas storage tank 20 is connected to the first nozzle 1111, and the CDS liquid supply machine 30 is configured to deliver pickling liquid to the second nozzle 1122. The CDS liquid supply machine 30 is a conventional automatic control system, and the present application does not limit it.

[0089] Furthermore, the CDS liquid supply machine 30 delivers the pickling liquid to the reflux tank 141 , and delivers the pickling liquid to the second nozzle 1122 through the reflux tank 141 .

[0090] The example of the present application also provides a copper electroplating method for a battery cell, comprising:

[0091] Obtaining a pre-treated cell provided with a copper seed layer;

[0092] By using the coating system 1, the pre-treated cell is passed through the purging section 111, the spraying section 112 and the drying section 113 in sequence by the conveying mechanism 13, and then directly placed on the printing table 121;

[0093] The pre-treated cell on the printing station 121 is coated with photosensitive adhesive, and then exposed, developed and electroplated.

[0094] The pretreated cell with a copper seed layer is placed on the conveying mechanism 13 in the coating system 1, and the conveying mechanism 13 is used to make the pretreated cell pass through the purging section 111 for nitrogen purging and dust removal, the spraying section 112 for acid washing and decontamination, and the drying section 113 for drying. Then, the dried pretreated cell is placed on the printing table 121 directly connected to the rear end of the drying section 113 for glue coating, which can reduce the surface impurities of the pretreated cell on the printing table 121, improve the coating quality, further improve the quality of the subsequent electroplating to form the gate line electrode, and reduce the probability of broken gates.

[0095] Furthermore, when entering the purge section 111 for nitrogen purge and dust removal, the pressure of the nitrogen sprayed from the first nozzle 1111 can be set to 3-6 bar. The concentration of the nitrogen can be 99.9%.

[0096] Furthermore, when entering the spraying part 112 for pickling and decontamination, the pickling liquid sprayed by the second nozzle 1122 is a sulfuric acid solution. The sulfuric acid solution is a low-concentration sulfuric acid solution, and the volume concentration can be 0.1%-2%.

[0097] Furthermore, when entering the drying section 113 and reverse drying, the drying temperature is 50-80°C.

[0098] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A copper electroplating method for a battery cell, characterized in that: include: Obtaining a pre-treated cell provided with a copper seed layer; A coating system is obtained, wherein the coating system comprises a coating device, a nitrogen gas storage tank and a CDS liquid supply machine, and the coating device comprises: A cleaning mechanism; the cleaning mechanism comprises a purge section, a spray section and a drying section arranged in sequence; the purge section is provided with a first nozzle for purging nitrogen gas to the battery cell; the spray section is provided with a first cleaning tank and a second nozzle, the second nozzle is configured to spray a pickling liquid to the first cleaning tank; the drying section is configured to dry the battery cell after being sprayed by the spray section; A coating mechanism; the coating mechanism comprises a printing table, and the printing table is directly connected to the rear end of the drying section; Conveying mechanism; the conveying mechanism is configured to convey the battery sheet sequentially through the purging section, the spraying section and the drying section to the printing table; The nitrogen gas storage tank is connected to the first nozzle, and the CDS liquid supply machine is configured to deliver pickling liquid to the second nozzle; Using the coating system, the pre-treated battery sheet is passed through the conveying mechanism in sequence through the purging section, the spraying section and the drying section, and then directly placed on the printing table; The pre-treated cell sheet located on the printing station is coated with photosensitive adhesive, and then exposed, developed and electroplated.

2. The copper electroplating method for a battery cell according to claim 1, characterized in that: The spraying part further includes a second cleaning tank disposed at the rear end of the first cleaning tank, and a third nozzle disposed at the second cleaning tank; the third nozzle is configured to spray water washing liquid to the second cleaning tank.

3. The copper electroplating method for a battery cell according to claim 2, characterized in that: The drying section includes a drying tank disposed at the rear end of the second cleaning tank, and a fourth nozzle disposed in the drying tank; the fourth nozzle is configured to blow drying gas into the drying tank.

4. The copper electroplating method for a battery cell according to claim 3, characterized in that: The purge portion further includes a purge tank, and the purge tank, the first cleaning tank, the second cleaning tank, and the drying tank are sequentially connected.

5. The copper electroplating method for a battery cell according to claim 4, characterized in that: The conveying mechanism includes a chain roller conveyor extending from the purge slot to the printing station.

6. The copper electroplating method for a battery cell according to claim 5, characterized in that: The first nozzle, the second nozzle, the third nozzle and the fourth nozzle reciprocate along a preset direction in the corresponding trough body through a connecting piece; the preset direction intersects with the extension direction of the chain roller conveyor.

7. The copper electroplating method for a battery cell according to any one of claims 1 to 6, characterized in that: The coating device also includes a feeding mechanism; the feeding mechanism includes a reflux groove connected to the first cleaning tank liquid, and the reflux groove is connected to the second nozzle for spraying the pickling liquid in the reflux groove to the first cleaning tank.

8. The copper electroplating method for a battery cell according to claim 1, characterized in that: The nitrogen purge pressure of the first nozzle is 3 bar-6 bar; the pickling liquid in the second nozzle includes a sulfuric acid solution with a mass concentration of 0.1%-2%.

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