Winding type charger and rotary electrical connection structure and forming method thereof

Abstract

The invention relates to a winding type charger and a rotary electrical connection structure and a forming method thereof, and the method comprises the following steps: carrying out the punch forming of an original sheet of a conductive sheet group and an original sheet of a conductive elastic sheet group to form a conductive sheet group precursor and a conductive elastic sheet group precursor, and enabling the conductive sheet group precursor and the conductive elastic sheet group precursor to comprise a plurality of annular conductors with a predetermined thickness, a pre-pressing part is connected among the multiple paths of annular conductors; forming a hollow part on the circuit board corresponding to the position of the pre-pressing part; mounting the conductive sheet group precursor and the conductive elastic sheet group precursor on the circuit board, and enabling the pre-pressing parts to correspond to the corresponding hollow parts during mounting; after surface mounting, the conductive sheet group precursor and the conductive elastic sheet group precursor are punched for the second time, the second punching comprises the step of cutting off or cutting off the pre-pressing part along the indentation, so that adjacent rings are isolated from each other to avoid short circuit, and the pre-pressing part correspondingly forms a first indentation part and a second indentation part after being punched, so that the first indentation part and the second indentation part are separated from each other; the rotary electrical connection structure is long in service life, reliable, high in alignment precision and convenient to form.

Description

Technical Field

[0001] The present invention relates to the technical field of wire-wound chargers, and in particular to a wire-wound charger and a rotating electrical connection structure and a forming method thereof. Background Art

[0002] The circuit boards of a wire-wound charging device are usually connected by conductors, wherein a conductor is mounted on one of the circuit boards, and the two rotate with the winding, while the other circuit board is fixed to the device housing and does not rotate. The circuit board fixed to the device housing is coated with copper foil on the side facing the conductor, and the copper foil abuts against and is electrically connected to the rotating conductor. During the process of the conductor being driven by the winding rotation, the end face of the conductor contacts and rubs against the copper foil. Since the copper foil is only at the micron level in thickness, it is easy to wear and has a short lifespan. If the copper foil is damaged, the electrical connection fails and the charging device fails immediately. Moreover, the electrical connection has high requirements for positioning accuracy. Therefore, there is an urgent need for a wire-wound charger and its rotating electrical connection structure and forming method to solve the above problems. Summary of the invention

[0003] In view of this, a winding type charger having a long service life, being reliable, having a high positioning accuracy and being easy to form and a rotating electrical connection structure and a forming method thereof are provided.

[0004] A rotating electrical connection structure of a winding charger comprises a first circuit board, a second circuit board, a conductive spring sheet group with a predetermined thickness and a conductive sheet group with a predetermined thickness, wherein the conductive spring sheet group is mounted on the first circuit board and electrically connected to the first circuit board, the conductive sheet group is mounted on the second circuit board and electrically connected to the second circuit board, the conductive spring sheet group comprises a multi-way annular spring sheet, the conductive sheet group comprises a multi-way conductive ring, the multi-way annular spring sheet has a first indentation portion between adjacent rings, the multi-way conductive ring has a second indentation portion between adjacent rings, each of the annular spring sheets abuts against and is electrically connected to a corresponding conductive ring, the first circuit board and the second circuit board are respectively provided with hollow portions corresponding to the first indentation portion and the second indentation portion, the first indentation portion and the second indentation portion are respectively indentations formed by stamping preset connecting strips between adjacent rings.

[0005] Furthermore, the intervals between adjacent rings of the multi-way annular spring sheet and the multi-way conductive ring are equal, the multi-way annular spring sheet and the multi-way conductive ring have the same number of rings and the same corresponding ring diameters.

[0006] Furthermore, the multi-way ring-shaped spring piece and the first indentation portion are an integrally formed structure, the multi-way conductive ring and the second indentation portion are an integrally formed structure, the multi-way ring-shaped spring piece and the first indentation portion are made of the same material, and the multi-way conductive ring and the second indentation portion are made of the same material.

[0007] Furthermore, the circumferential width and radial length of the hollow portion are respectively greater than the circumferential width and radial length of the corresponding first indentation portion and second indentation portion, so as to avoid damaging the first circuit board and the second circuit board when the first indentation portion and the second indentation portion are broken.

[0008] Furthermore, the hollow portion is a through hole that penetrates the thickness of the first circuit board and the second circuit board, or is a blind hole.

[0009] Furthermore, the conductive spring sheet group is welded or bonded to the first circuit board, and the conductive sheet group is welded or bonded to the second circuit board.

[0010] Furthermore, the multi-way annular spring pieces are multi-way annular spring pieces arranged in concentric circle order, and the multi-way conductive rings are multi-way conductive rings arranged in concentric circle order; each of the annular spring pieces has a plurality of evenly distributed elastic contact pieces or contact points, and the plurality of elastic contact pieces or contact points on each of the annular spring pieces are correspondingly arranged along the radial direction.

[0011] Furthermore, each of the annular spring sheets extends the elastic contact sheet or contact point toward the direction of the corresponding conductive ring, and each of the annular spring sheets is electrically connected to the corresponding conductive ring through the elastic contact sheet or contact point.

[0012] Furthermore, the thickness of the conductive sheet group is in the range of 0.1 mm or more, and the conductive spring sheet group and the conductive sheet group are both made of copper.

[0013] And, a winding type charger comprises a charging body and a winding device arranged in the charging body, wherein the winding device comprises the rotating electrical connection structure of the winding type charger.

[0014] Furthermore, the forming method of the above-mentioned winding type charger rotating electrical connection structure comprises the following steps: The conductive sheet group original sheet and the conductive spring sheet group original sheet are stamped to form a conductive sheet group precursor and a conductive spring sheet group precursor, wherein the conductive sheet group precursor includes a multi-way conductive ring with a predetermined thickness, and a second pre-pressing portion is connected between the multi-way conductive rings; and the conductive spring sheet group precursor includes a multi-way ring-shaped spring sheet with a predetermined thickness, and a first pre-pressing portion is connected between the multi-way ring-shaped spring sheets; Forming hollow portions on the first circuit board and the second circuit board corresponding to the positions of the first pre-pressing portion and the second pre-pressing portion respectively; The conductive sheet group front body is mounted on the second circuit board, and the conductive spring sheet group front body is mounted on the first circuit board, and each of the second pre-pressing parts and each of the first pre-pressing parts are respectively corresponding to the corresponding hollow parts during mounting; After mounting, the conductive sheet group precursor and the conductive spring sheet group precursor are punched for a second time respectively. The second punching includes punching out or breaking off the second pre-pressing part and the first pre-pressing part along the indentation so that adjacent rings are isolated from each other to form multiple mutually isolated conductive rings and multiple mutually isolated annular spring sheets. The first pre-pressing part and the second pre-pressing part form the first indentation part and the second indentation part respectively after punching.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: First, the above-mentioned winding charger rotating electrical connection structure adopts a copper conductive sheet group with a thickness of more than 0.1 mm to replace the micron-level copper foil printed on the traditional circuit board. In the process of the winding charger rotating electrical connection structure driving the conductive spring sheet group to rotate, the conductive spring sheet group changes from frictional contact with the copper foil to frictional contact with the conductive sheet group. Since the thickness of the conductive sheet group is increased compared to the copper foil, it is less likely to be damaged by wear and tear, has a long service life, and the reliability of the electrical connection is enhanced.

[0016] Second, the forming method of the rotating electrical connection structure of the winding charger adopts a first indentation between adjacent rings of the multi-way annular spring sheet, and a second indentation between adjacent rings of the multi-way conductive ring. The first indentation and the second indentation are used to ensure the relative position of each ring to facilitate one-piece forming, so that when the conductive spring sheet group and the conductive sheet group are mounted on the first circuit board and the second circuit board respectively, there is no need to align each ring separately, and the whole can be aligned once, with high alignment accuracy. Through stamping, industrial mass production can be achieved, and mature stamping technology can be fully utilized, which greatly improves the operability and convenience of the process, improves product quality, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the steps of a method for forming a rotating electrical connection structure of a winding charger according to an embodiment of the present invention.

[0018] Figure 2 It is an overall three-dimensional schematic diagram of a rotating electrical connection structure of a winding type charger according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of an exploded view of a rotating electrical connection structure of a winding charger according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of an exploded view of another direction of a rotating electrical connection structure of a winding charger according to an embodiment of the present invention.

[0021] Figure 5It is a schematic diagram of mounting a first circuit board and a conductive spring sheet assembly of a rotating electrical connection structure of a wire-wound charger according to an embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of mounting a second circuit board and a conductive sheet assembly of a rotating electrical connection structure of a wire-wrap charger according to an embodiment of the present invention.

[0023] in, 1. First circuit board; 2. Second circuit board; 3. Conductive spring sheet group; 31. First indentation; 32. Ring-shaped spring sheet; 4. Conductive sheet group; 41. Second indentation; 42. Conductive ring; 5. Hollow portion; 6. Front cover; 7. Back cover; 8. Winding reel; 81. First reel surface; 82. Second reel surface; 9. Winding shaft; 10. Charging cable. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] See also Figures 1 to 6 , showing a rotating electrical connection structure of a wire-wound charger provided by an embodiment of the present invention, comprising a first circuit board 1, a second circuit board 2, a conductive spring sheet group 3 with a predetermined thickness and a conductive sheet group 4 with a predetermined thickness, wherein the conductive spring sheet group 3 is mounted on the first circuit board 1 and electrically connected to the first circuit board 1, and the conductive sheet group 4 is mounted on the second circuit board 2 and electrically connected to the second circuit board 2, the conductive spring sheet group 3 comprises a multi-way annular spring sheet 32, and the conductive sheet group 4 comprises a multi-way conductive ring 42, wherein the multi-way annular spring sheet 32 ​​has a first indentation 31 between adjacent rings, and the multi-way conductive ring 42 has a second indentation 41 between adjacent rings, and each of the annular spring sheets 32 abuts against and is electrically connected to a corresponding conductive ring 42, and the first circuit board 1 and the second circuit board 2 are respectively provided with hollow portions 5 corresponding to the first indentation 31 and the second indentation 41, and the first indentation 31 and the second indentation 41 are respectively indentations formed by punching preset connecting strips between adjacent rings.

[0026] Specifically, the intervals between adjacent rings of the multi-way ring-shaped spring piece 32 and the multi-way conductive ring 42 are equal, the multi-way ring-shaped spring piece 32 and the multi-way conductive ring 42 have the same number of rings and the same corresponding ring diameters.

[0027] Specifically, the multi-way ring-shaped spring piece 32 and the first indentation portion 31 are a structure formed by stamping, the multi-way conductive ring 42 and the second indentation portion 41 are a structure formed by stamping, the multi-way ring-shaped spring piece 32 and the first indentation portion 31 are made of the same material, and the multi-way conductive ring 42 and the second indentation portion 41 are made of the same material. During the stamping and integral molding, the connection between the preset connecting strips and the ring wall between the adjacent rings is partially broken. In some specific embodiments, the connection between the connecting strip and the ring wall can be broken by 1 / 3 or 1 / 2. After the conductive spring piece group 3 and the conductive sheet group 4 are mounted on the circuit board, the unbroken part is completely broken by a stamping device or a stamping auxiliary jig. Figures 4 and 5 show a state where the connecting strip is not completely broken. More specifically, the first indentation 31 and the second indentation 41 are formed after the connecting strip is broken, and may be fractured remnants. More specifically, the connecting strip is at least pre-punched or otherwise formed to form marks that are convenient for secondary breaking, for example, tooth marks or indentations. The breaking marks may be one or two, preferably two. The upper and lower ends of the connecting strip in the radial direction connect the ring walls of two adjacent rings. Preferably, the two stamping marks are located at the upper and lower ends where the connecting strip is connected to the ring wall, so as to ensure isolation between the rings after breaking.

[0028] Specifically, the circumferential width and radial length of the hollow portion 5 are respectively greater than the circumferential width and radial length of the corresponding first indentation portion 31 and second indentation portion 41 to avoid damaging the first circuit board 1 and the second circuit board 2 when the first indentation portion 31 and the second indentation portion 41 are broken.

[0029] More specifically, the hollow portion 5 is a through hole that penetrates the thickness of the first circuit board 1 and the second circuit board 2 , or is a blind hole.

[0030] Specifically, the conductive spring sheet group 3 is welded or bonded to the first circuit board 1, and the conductive sheet group 4 is welded or bonded to the second circuit board 2. In some specific embodiments, it is preferred to set multiple circles of pads on the first circuit board 1 and the second circuit board 2, and solder paste is evenly applied on each circle of pads. The conductive spring sheet group 3 and the conductive sheet group 4 are fixed to the corresponding pads through a reflow soldering process.

[0031] Specifically, the multi-way annular spring pieces 32 are multi-way annular spring pieces 32 arranged in a concentric circle sequence, and the multi-way conductive rings 42 are multi-way conductive rings 42 arranged in a concentric circle sequence; each of the annular spring pieces 32 has a plurality of evenly distributed elastic contact pieces or contact points, and the plurality of elastic contact pieces or contact points on each of the annular spring pieces 32 are correspondingly arranged along the annular direction, for example Figure 4 As shown, elastic contact pieces are provided at three locations on the annular spring piece 32 of each loop, and the three locations are evenly distributed on the same loop at three equal distances.

[0032] More specifically, each of the annular spring pieces 32 extends the elastic contact piece or contact point toward the direction of the corresponding conductive ring 42, and each of the annular spring pieces 32 is electrically connected to the corresponding conductive ring 42 through the elastic contact piece or contact point. Figure 4 In the example shown, elastic contact pieces are used, and the elastic contact pieces are arranged on the annular elastic pieces 32. The elastic contact pieces extend obliquely from the annular piece body.

[0033] Specifically, the thickness of the conductive sheet group 4 is in the range of 0.1 mm or more, preferably 0.1 mm to 0.3 mm, which is several dozen times the micron-level thickness of the copper foil printed on a traditional circuit board and is more wear-resistant than copper foil. The conductive spring sheet group 3 and the conductive sheet group 4 are preferably made of copper material with good conductive properties.

[0034] An embodiment of the present invention further provides a wire-wrap charger, comprising a charging body and a wire-wrap device disposed in the charging body, wherein the wire-wrap device comprises the above-mentioned rotating electrical connection structure. In this embodiment, the charging body is preferably a vehicle-mounted charging body, with a built-in wire winding reel 8 and a charging cable 10 wound around it. When the wire-wrap charger is inserted into the cigarette lighter, the charging cable 10 is extended by pulling the wire winding reel 8 to facilitate charging over a longer distance. Preferably, the free end of the charging cable 10 can extend at least one charging interface, more preferably three charging interfaces, for example, including a USB type-c interface, a Lightning interface, a Micro USB interface, and the like.

[0035] Specifically, the winding type charger also includes a front cover 6 and a rear cover 7, which together form a storage compartment. A winding device is provided in the storage compartment. The winding device includes a winding reel 8, a winding shaft 9 and a rotating electrical connection structure. The winding reel 8 has a first disk surface 81 and a second disk surface 82. The first disk surface 81 faces the front cover 6, and the second disk surface 82 faces the rear cover 7. The center of the first disk surface 81 is provided with a winding shaft 9, and the charging cable 10 is wound around the winding shaft 9 as the axis. More specifically, a plurality of circular grooves are provided in the center of the second disk surface 82 to accommodate the first circuit board 1, the second circuit board 2 is detachably connected to the back cover 7, the conductive spring sheet group 3 is welded or bonded to the first circuit board 1, the conductive sheet group 4 is welded or bonded to the second circuit board 2, each annular spring sheet 32 ​​on the conductive spring sheet group 3 abuts against and is electrically connected to a corresponding conductive ring 42 on the conductive sheet group 4, when the charging cable 10 is pulled out or retracted, the winding shaft 9 drives the winding disk 8 to rotate, and the winding disk 8 drives the first circuit board 1 on the second disk surface 82 to rotate, and during the rotation process, each annular spring sheet 32 ​​always maintains an electrical connection with the corresponding conductive ring 42.

[0036] The method for forming the above-mentioned rotating electrical connection structure of the winding type charger comprises the following steps: S10, stamping out the original sheet of the conductive sheet group 4 and the original sheet of the conductive spring sheet group 3 into a conductive sheet group 4 precursor and a conductive spring sheet group 3 precursor, wherein the conductive sheet group 4 precursor comprises a multi-way conductive ring 42 with a predetermined thickness, and a second pre-pressing portion is connected between the multi-way conductive rings 42; and the conductive spring sheet group 3 precursor comprises a multi-way ring-shaped spring sheet 32 ​​with a predetermined thickness, and a first pre-pressing portion is connected between the multi-way ring-shaped spring sheets 32.

[0037] In step S10, the precursor of the conductive sheet group 4 and the precursor of the conductive spring sheet group 3 are preformed. In the two precursors, there are connecting strips between the rings, that is, the ring bodies of the two precursors are connected as one. This facilitates integral mounting on the corresponding circuit board. The multi-channel conductive ring 42 or the multi-channel ring spring sheet 32 ​​are mounted on the circuit board at one time, without the need for separate mounting or separate molding of each channel. The structure of the integrated multi-channel ring is formed by one-time stamping.

[0038] S20, forming hollow portions 5 on the first circuit board 1 and the second circuit board 2 corresponding to the positions of the first pre-pressing portion and the second pre-pressing portion, respectively.

[0039] The numbers of the steps do not represent the order of precedence. For example, there is no order between step S10 and step S20, that is, there is no order between the process of forming the first pre-pressing part of the conductive spring group 3 and the second pre-pressing part of the conductive sheet group 4 and the process of forming the hollow part 5 of the first circuit board 1 and the second circuit board 2, and they can be performed simultaneously or successively without affecting each other. The structure of the hollow part 5 refers to the above, and the method for forming the hollow part 5 is preferably to form it during the circuit board molding process, or to pre-form it when the board is prefabricated.

[0040] S30, the conductive sheet group 4 is mounted on the second circuit board 2, and the conductive spring sheet group 3 is mounted on the first circuit board 1, and each of the second pre-pressed parts and each of the first pre-pressed parts are respectively corresponding to the corresponding hollow parts 5. Specifically, in step S30, the mounting of this embodiment is preferably welding, and preferably multiple circles of pads are set on the first circuit board 1 and the second circuit board 2, and solder paste is evenly applied on each circle of pads, and the conductive spring sheet group 3 and the conductive sheet group 4 are fixed to the corresponding pads through a reflow soldering process.

[0041] S40, after mounting, the precursor of the conductive sheet group 4 and the precursor of the conductive spring sheet group 3 are punched for a second time respectively. The second punching includes punching out or breaking off the second pre-pressing part and the first pre-pressing part along the indentation so that adjacent rings are isolated from each other, forming multiple mutually isolated conductive rings 42 and multiple mutually isolated annular spring sheets 32 to avoid short circuit. The first pre-pressing part and the second pre-pressing part are formed into the first indentation part 31 and the second indentation part 41 respectively after punching. Specifically, in step S40, the precursor of the conductive sheet group 4 and the precursor of the conductive spring sheet group 3 are punched for a second time. Before the second punching, the connecting strips of the two precursors have been pre-punched into partial fractures in S10, and the upper surface of the connecting strip has indentations or cracks, so that the connecting strip can be completely punched out along the traces during the second punching. Preferably, the connecting strip is partially broken by 1 / 3 or 1 / 2 before the second punching, and the indentations or cracks are located at the upper and lower ends where the connecting strip is connected to the ring wall, so as to ensure isolation between the rings after punching. More specifically, the first indentation portion 31 and the second indentation portion 41 are formed after the connecting strip is punched out, and may be fractured residual portions.

[0042] In summary, the above-mentioned winding charger rotating electrical connection structure adopts a copper conductive sheet group 4 with a thickness of more than 0.1 mm to replace the micron-level copper foil printed on the traditional circuit board, so that in the process of the winding charger rotating electrical connection structure driving the conductive spring sheet group 3 to rotate, the conductive spring sheet group 3 changes from friction contact with the copper foil to friction contact with the conductive sheet group 4. Since the thickness of the conductive sheet group 4 is increased compared with the copper foil, it is less likely to be damaged due to wear and tear, has a long service life, and the reliability of the electrical connection is enhanced; moreover, this molding method adopts a first indentation portion 31 between adjacent rings of the multi-way annular spring sheet 32, and a second indentation portion 41 between adjacent rings of the multi-way conductive ring 42. The relative positions of each ring are respectively guaranteed by the first indentation portion 31 and the second indentation portion 41, so as to facilitate the one-piece molding and make the conductive spring sheet group 3 and the conductive sheet group 4 respectively mounted on the first circuit board 1 and the second circuit board 2, without the need to align each ring separately and mount them one by one, and the whole can be aligned and mounted once, with high alignment accuracy. Through stamping, industrial mass production can be achieved, and mature stamping technology can be fully utilized, which greatly improves the operability and convenience of the process, improves product quality, and increases production efficiency.

[0043] It should be noted that the present invention is not limited to the above-mentioned embodiments. Based on the creative spirit of the present invention, those skilled in the art may also make other changes. These changes made based on the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. A rotating electrical connection structure of a winding charger, characterized in that: It includes a first circuit board, a second circuit board, a conductive spring sheet group with a predetermined thickness and a conductive sheet group with a predetermined thickness, the conductive spring sheet group is mounted on the first circuit board and electrically connected to the first circuit board, the conductive sheet group is mounted on the second circuit board and electrically connected to the second circuit board, the conductive spring sheet group includes a multi-way ring-shaped spring sheet, the conductive sheet group includes a multi-way conductive ring, the multi-way ring-shaped spring sheet has a first indentation between adjacent rings, the multi-way conductive ring has a second indentation between adjacent rings, each of the ring-shaped spring sheets abuts against and is electrically connected to a corresponding conductive ring, the first circuit board and the second circuit board are respectively provided with hollow portions corresponding to the first indentation and the second indentation, the first indentation and the second indentation are respectively formed by stamping preset connecting strips between adjacent rings.

2. A rotating electrical connection structure for a wire-wound charger as claimed in claim 1, characterized in that: The spacing between adjacent rings of the multi-way ring-shaped spring sheet and the multi-way conductive ring is equal. The multi-way ring-shaped spring sheet and the multi-way conductive ring have the same number of rings and the same corresponding ring diameters.

3. A rotating electrical connection structure for a wire-wound charger as claimed in claim 1, characterized in that: The multi-way ring-shaped spring piece and the first indentation portion are an integrally formed structure, the multi-way conductive ring and the second indentation portion are an integrally formed structure, the multi-way ring-shaped spring piece and the first indentation portion are made of the same material, and the multi-way conductive ring and the second indentation portion are made of the same material.

4. A rotating electrical connection structure for a wire-wound charger as claimed in claim 1, characterized in that: The circumferential width and radial length of the hollow portion are respectively greater than the circumferential width and radial length of the corresponding first indentation portion and second indentation portion, so as to avoid damaging the first circuit board and the second circuit board when the first indentation portion and the second indentation portion are broken. The hollow portion is a through hole that penetrates the thickness of the first circuit board and the second circuit board, or is a blind hole.

5. A rotating electrical connection structure for a wire-wound charger as claimed in claim 1, characterized in that: The conductive spring sheet group is welded or bonded to the first circuit board, and the conductive sheet group is welded or bonded to the second circuit board.

6. A rotating electrical connection structure for a winding charger as claimed in claim 1, characterized in that: The multi-way annular spring pieces are arranged in a concentric circle sequence, and the multi-way conductive rings are arranged in a concentric circle sequence; each of the annular spring pieces has a plurality of evenly distributed elastic contacts or contact points, and the plurality of elastic contacts or contact points on each of the annular spring pieces are correspondingly arranged along the radial direction.

7. A rotating electrical connection structure for a winding charger as claimed in claim 6, characterized in that: Each of the annular spring sheets extends the elastic contact sheet or contact point toward the direction of the corresponding conductive ring, and each of the annular spring sheets is electrically connected to the corresponding conductive ring through the elastic contact sheet or contact point.

8. A rotating electrical connection structure for a wire-wound charger as claimed in claim 1, characterized in that: The thickness of the conductive sheet group is in the range of 0.1 mm or more, and the conductive spring sheet group and the conductive sheet group are both made of copper.

9. A wire-wound charger, comprising a charging body and a wire-wound device disposed in the charging body, characterized in that: The winding device includes an electrical connection structure of a vehicle-mounted retractable wire charging device as described in any one of claims 1 to 8.

10. The method for forming a rotating electrical connection structure of a winding type charger according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: The conductive sheet group original sheet and the conductive spring sheet group original sheet are stamped to form a conductive sheet group precursor and a conductive spring sheet group precursor, wherein the conductive sheet group precursor includes a multi-way conductive ring with a predetermined thickness, and a second pre-pressing portion is connected between the multi-way conductive rings; the conductive spring sheet group precursor includes a multi-way ring-shaped spring sheet with a predetermined thickness, and a first pre-pressing portion is connected between the multi-way ring-shaped spring sheets; Forming hollow portions on the first circuit board and the second circuit board corresponding to the positions of the first pre-pressing portion and the second pre-pressing portion respectively; The conductive sheet group front body is mounted on the second circuit board, and the conductive spring sheet group front body is mounted on the first circuit board, and each of the second pre-pressing parts and each of the first pre-pressing parts correspond to the corresponding hollow parts respectively during mounting; After mounting, the precursor of the conductive sheet group and the precursor of the conductive spring sheet group are punched for a second time respectively. The second punching includes punching out or breaking off the second pre-pressing portion and the first pre-pressing portion along the indentation so that adjacent rings are isolated from each other to form multiple mutually isolated conductive rings and multiple mutually isolated annular spring sheets. The first pre-pressing portion and the second pre-pressing portion form the first indentation portion and the second indentation portion respectively after punching.

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