# US 12,191,588 B2 · Flexible printed circuit board and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,588 B2 - Document ID: US12191588B2 - Status: Granted - Kind: B2 - Application number: 18/004,165 - Filed: 2022-09-08 - Published: 2024-07-18 - Granted: 2025-01-07 - Earliest claimed: 2021-12-28 - Assignees: Honor Device Co., Ltd. - Applicants: Honor Device Co., Ltd. - Inventors: Yawei Zhou; Fan Luo - Web page: https://patentgrep.com/patent/US12191588B2 ## CPC - H01R 12/613: {by means of interconnecting elements} - H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)} - H05K 3/363: {by soldering} - H05K 2201/10977: Encapsulated connections - H05K 2203/167: Using mechanical means for positioning, alignment or registration, e.g. using rod-in-hole alignment - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A flexible printed circuit board includes a first flexible unit and a second flexible unit, where the first flexible unit includes a first connecting portion and a plurality of first wires, and each of the first wires includes a welding point located at the first connecting portion; each of the welding points is provided with a first connecting structure, and the welding point is electrically connected to the first connecting structure; the second flexible unit includes a first face and a second face, where the first face is located on a side of the second flexible unit facing away from the first flexible unit; the second flexible unit further includes a second connecting portion and a plurality of second wires; the second connecting portion is provided with a plurality of through holes, and the plurality of through holes are provided in one-to-one correspondence to the plurality of second wires. ## Claims ### Claim 1 A flexible printed circuit board, comprising: a first flexible unit with a first connecting portion and a plurality of first wires, and a second flexible unit with a first face and a second face; wherein each of the first wires comprises a welding point located at the first connecting portion, each of the welding points is provided with a first connecting structure, and the welding point is electrically connected to the first connecting structure; wherein the first face is located on a side of the second flexible unit facing away from the first flexible unit; wherein the second flexible unit further comprises a second connecting portion and a plurality of second wires, the second connecting portion is provided with a plurality of through holes, the plurality of through holes are provided in one-to-one correspondence to the plurality of second wires, a second connecting structure is disposed around a side wall of each of the through holes, and the second connecting structure extends to the first face and the second face and is electrically connected to the second wire; and wherein the first connecting structure runs through the through hole and is electrically connected to the second connecting structure. ### Claim 2 (depends on 1) The flexible printed circuit board of claim 1, wherein the first connecting structure comprises a first connecting sub-portion, a middle sub-portion, and a second connecting sub-portion connected in sequence; and wherein the first connecting sub-portion is located between the first flexible unit and the second flexible unit, and is electrically connected to the second connecting structure located on the second face, the middle sub-portion is located inside the through hole and in contact with and electrically connected to the second connecting structure located in the through hole, and the second connecting sub-portion protrudes from the first face and is electrically connected to the second connecting structure located on the first face. ### Claim 3 (depends on 2) The flexible printed circuit board of claim 2, wherein the first connecting structure and the second connecting structure are electrically connected by welding. ### Claim 4 (depends on 3) The flexible printed circuit board of claim 3, wherein in a first direction, a thickness of the first connecting sub-portion is H1, wherein H1 is greater than or equal to 0.02 mm and less than or equal to 0.04 mm; and a thickness of the second connecting sub-portion is H2, wherein H2 is greater than or equal to 0.03 mm and less than or equal to 0.05 mm; and wherein the first direction is a direction in which the first connecting portion points to the second connecting portion. ### Claim 5 (depends on 1) The flexible printed circuit board of claim 1, wherein the flexible printed circuit board further comprises an adhesive layer; and the adhesive layer is located between the first connecting portion and the second connecting portion. ### Claim 6 (depends on 5) The flexible printed circuit board of claim 5, wherein the adhesive layer is provided around a plurality of first connecting structures. ### Claim 7 (depends on 1) The flexible printed circuit board of claim 1, wherein the first connecting portion is provided with a first positioning structure, and the second connecting portion is provided with a second positioning structure; and wherein orthographic projections of the first positioning structure and the second positioning structure on the first connecting portion are identical or complementary in shape. ### Claim 8 (depends on 7) The flexible printed circuit board of claim 7, wherein a minimum distance from the first positioning structure to the first connecting structure is W1, wherein W1 is greater than 0.5 mm; and wherein a minimum distance from the second positioning structure to the through hole is W2, wherein W2 is greater than 0.5 mm. ### Claim 9 (depends on 7) The flexible printed circuit board of claim 7, wherein the first positioning structure comprises a positioning rod, and the second positioning structure comprises a positioning hole. ### Claim 10 (depends on 9) The flexible printed circuit board of claim 9, wherein a minimum distance from the positioning hole to an edge of the second connecting portion is W3, wherein W3 is greater than 0.5 mm. ### Claim 11 (depends on 9) The flexible printed circuit board of claim 9, wherein in a first direction, the positioning rod is cylindrical, conical or truncated cone-shaped, and the positioning hole matches the positioning rod in shape; and wherein the first direction is a direction in which the first connecting portion points to the second connecting portion. ### Claim 12 (depends on 7) The flexible printed circuit board of claim 7, wherein the first positioning structure comprises a positioning rod, and the second positioning structure comprises a positioning slot; wherein the second flexible unit further comprises a side face connecting the first face and the second face; and wherein the positioning slot penetrates through the first face and the second face, and an opening of the positioning slot is located on the side face. ### Claim 13 (depends on 1) The flexible printed circuit board of claim 1, wherein the first face and the second face each comprise the second wire; and in a first direction, the second wire located on the first face overlaps with the second wire located on the second face; wherein the first direction is a direction in which the first connecting portion points to the second connecting portion. ### Claim 14 (depends on 1) The flexible printed circuit board of claim 1, wherein the flexible printed circuit board further comprises an insulation layer; and wherein the insulation layer is provided on a side of the second connecting portion facing away from the first connecting portion. ### Claim 15 An electronic device, comprising a flexible printed circuit board; wherein the flexible printed circuit board comprises: a first flexible unit with a first connecting portion and a plurality of first wires, and a second flexible unit with a first face and a second face; wherein each of the first wires comprises a welding point located at the first connecting portion, each of the welding points is provided with a first connecting structure, and the welding point is electrically connected to the first connecting structure; wherein the first face is located on a side of the second flexible unit facing away from the first flexible unit; wherein the second flexible unit further comprises a second connecting portion and a plurality of second wires, the second connecting portion is provided with a plurality of through holes, the plurality of through holes are provided in one-to-one correspondence to the plurality of second wires, a second connecting structure is disposed around a side wall of each of the through holes, and the second connecting structure extends to the first face and the second face and is electrically connected to the second wire; and wherein the first connecting structure runs through the through hole and is electrically connected to the second connecting structure. ### Claim 16 (depends on 15) The electronic device of claim 15, further comprising: a battery and a battery compartment for accommodating the battery; wherein the battery compartment is provided with an accommodating groove on a side closer to the flexible printed circuit board, and the accommodating groove is configured to accommodate the first connecting portion and the second connecting portion. ### Claim 17 (depends on 16) The electronic device of claim 16, wherein a minimum distance from an edge of the accommodating groove to a side wall of the battery compartment is W4, wherein W4 is greater than or equal to 4 mm. ### Claim 18 (depends on 15) The electronic device of claim 15, wherein the electronic device further comprises a supporting structure; and the supporting structure is located on a side of the first connecting portion facing away from the second connecting portion. ### Claim 19 (depends on 15) The electronic device of claim 15, wherein the electronic device further comprises a heat insulation structure; and the heat insulation structure is located on a side of the first connecting portion facing away from the second connecting portion. ### Claim 20 (depends on 15) The electronic device of claim 15, wherein the first connecting structure comprises a first connecting sub-portion, a middle sub-portion, and a second connecting sub-portion connected in sequence; and wherein the first connecting sub-portion is located between the first flexible unit and the second flexible unit, and is electrically connected to the second connecting structure located on the second face, the middle sub-portion is located inside the through hole and in contact with and electrically connected to the second connecting structure located in the through hole, and the second connecting sub-portion protrudes from the first face and is electrically connected to the second connecting structure located on the first face.