Method for manufacturing back contact cells, transfer welding apparatus and back contact cell assembly
By forming a connection structure on the transfer welding mechanism and hot-pressing it to the back of the battery cell, an integrated process of series connection and metallization of back contact batteries is achieved, which solves the problem of cumbersome manufacturing process of back contact battery modules, improves processing efficiency and reduces costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUZHOU JBAO TECH LTD
- Filing Date
- 2026-02-13
- Publication Date
- 2026-06-09
Smart Images
Figure CN122180179A_ABST
Abstract
Claims
1. A method for manufacturing a back-contact battery, characterized in that, The method for manufacturing the back contact battery includes: A connection structure is formed on the transfer welding mechanism; Provide battery cells; The connection structure is hot-pressed and transferred to one side surface of two adjacent battery cells; After the hot-press transfer welding, the connection structure makes ohmic contact with the electrode regions of opposite polarities on the two adjacent battery cells to connect the two adjacent battery cells in series.
2. The method for manufacturing a back contact battery according to claim 1, characterized in that, The step of forming a connection structure on the transfer welding mechanism includes: simultaneously forming multiple connection structures on the transfer welding mechanism; The step of providing the battery cells includes: providing a plurality of the battery cells arranged in sequence; The step of hot-press welding the connection structure to one side surface of two adjacent battery cells includes: simultaneously hot-press welding multiple connection structures to one side surface of the multiple battery cells; After the hot-press transfer welding, each of the connection structures makes ohmic contact with the electrode regions of opposite polarities on two adjacent battery cells, so as to connect the multiple battery cells in series to form a battery string.
3. The method for manufacturing a back contact battery according to claim 2, characterized in that, The step of forming a connection structure on the transfer welding mechanism includes: simultaneously forming a busbar and multiple connection structures on the transfer welding mechanism; multiple connection structures corresponding to the same polarity at the end of the battery string are connected through the busbar.
4. The method for manufacturing a back contact battery according to claim 1, characterized in that, The connection structure is formed on the transfer welding mechanism by means of electroplating, metal wire embedding, or slurry filling and curing.
5. The method for manufacturing a back contact battery according to claim 4, characterized in that, The step of forming the connection structure on the transfer welding mechanism includes: A main body layer is formed by electroplating on the transfer welding mechanism, and the material of the main body layer includes at least one of copper, nickel, titanium, and silver; A welding layer is formed by electroplating on the main body layer, and the material of the welding layer includes tin.
6. A transfer welding device, characterized in that, The transfer welding equipment includes a transfer welding mechanism for forming a connection structure and cooperating in hot-press transfer welding. The connection structure is able to make ohmic contact with electrode regions of opposite polarities on two adjacent battery cells after the hot-press transfer welding, so as to connect the two adjacent battery cells in series. The transfer welding mechanism includes: substrate; A conductive layer is disposed on the substrate and is used to conduct current during electroplating; and A mask layer is disposed on the side of the conductive layer opposite to the substrate, and the mask layer has a slotted pattern for forming the connection structure.
7. The transfer welding equipment according to claim 6, characterized in that, The slotting pattern includes a first slot extending along a first direction, the first direction being perpendicular to the thickness direction of the substrate; The first groove is used to form a first grid line, which is capable of ohmic contact with electrode regions of opposite polarity on two adjacent cells.
8. The transfer welding equipment according to claim 7, characterized in that, The slotting pattern includes a plurality of second slots spaced apart along the first direction, each second slot extending along a second direction and connected to the first slot, the second direction being perpendicular to the first direction and the thickness direction of the substrate; The second groove is used to form a second grid line, a portion of which makes ohmic contact with one of the two adjacent cells, and another portion of which makes ohmic contact with the other of the two adjacent cells.
9. The transfer welding equipment according to claim 7 or 8, characterized in that, The mask layer has a third groove, and the extension direction of the third groove is perpendicular to the thickness direction of the substrate; The third slot is located on one side of all the slotted patterns along the first direction and is connected to the first slot of the plurality of connection structures with the same polarity for forming the ends of the battery string.
10. A back-contact battery assembly, characterized in that, The grid lines are fabricated and the cells are connected in series using the manufacturing method of the back contact battery according to any one of claims 1 to 5.