CN110571877A

CN110571877A - Flexible wireless charging device

Info

Publication number: CN110571877A
Application number: CN201910405176.8A
Authority: CN
Inventors: 刘晨敏; 路胜博; 韩颖龙
Original assignee: Nano and Advanced Materials Institute Ltd
Current assignee: Nano and Advanced Materials Institute Ltd
Priority date: 2018-05-18
Filing date: 2019-05-16
Publication date: 2019-12-13
Anticipated expiration: 2039-05-16
Also published as: CN110571877B

Abstract

A bendable wireless charging device having an operational bend radius of approximately 90 degrees includes a flexible substrate, a receiving coil, a battery, a flexible EMI shielding layer, and a control module. The receiving coil is arranged on one surface of the substrate and is electrically connected to the control module. The battery, which may be a flexible battery, is disposed below the other surface of the substrate. An EMI shielding layer is disposed between the receiver coil and the battery.

Description

flexible wireless charging device

Technical Field

The present invention relates to electronic charging devices, and more particularly to a wireless charging device having a bend radius that can be operated up to about 90 degrees in use.

Background

recently, with the development of a non-contact (i.e., wireless) charging technology, portable electronic devices have been wirelessly charged using an inductive wireless charging device. Wireless power transmission may be defined as resonant wireless power transmission by magnetic induction between a coil located at a Power Transmitting Unit (PTU) and a coil located at a Power Receiving Unit (PRU); the PRU then transmits the received power to batteries of various types of portable electronic devices.

Wearable electronic devices in particular require thin and light batteries to be comfortable and secure for the wearer. As wearable electronic devices take on more complex shapes, batteries that are capable of bending or flexing with the body of the wearer are needed. Although some flexible batteries have been disclosed, these batteries tend to have various rigid or fragile components, such as ceramic separators, which limit the extent to which the battery can bend. Integration of the PRU itself with the aforementioned flexible battery is also considered another challenge; since the receiver coil is typically formed from a thick metal wire that is not easily bent.

Therefore, it has become a challenge for battery manufacturers to integrate PRUs and flexible batteries into flexible charging devices. There is a need for a bendable wireless charging device and a flexible battery; such devices and batteries may be used in flexible electronic devices, such as portable wearable electronic devices.

Disclosure of Invention

It is an object of the present invention to provide a wireless charging device that addresses the above and other needs. According to one aspect of the present invention, a battery-integrated bendable wireless charging apparatus, in particular a flexible battery, is provided.

According to one embodiment of the present invention, a bendable wireless charging device includes a flexible substrate, a flexible receiving coil, a battery, a flexible EMI shielding layer, and a control module. The base plate has an operational bend radius of about 90 degrees. The receiving coil is disposed on a surface of the substrate. The battery is located under the other surface of the substrate. The EMI shielding layer is disposed between the receiving coil and the battery provided on the substrate. The control module is arranged or formed on one side of the substrate adjacent to the receiving coil and is respectively and electrically connected with the receiving coil and the battery.

According to another aspect of the present invention, the bendable wireless charging apparatus further includes an additional output connection set connected to the external load, enabling the flexible battery to simultaneously perform the wireless charging process and the discharging process on the external load. The control module controls a charging process of the flexible battery and/or a discharging process of the load.

drawings

The drawings illustrate the invention by way of example and not by way of limitation. In the drawings, like or similar reference characters designate like or similar elements, and wherein:

Fig. 1 schematically illustrates a bendable wireless charging apparatus according to an embodiment of the present invention;

Fig. 2 shows an example of a bendable wireless charging apparatus according to an embodiment of the present invention;

Fig. 3 shows an example of a cross-sectional view of a bendable wireless charging apparatus without a battery;

Fig. 4 shows an example of a practical implementation of a bendable wireless charging apparatus according to an embodiment of the invention;

FIG. 5 schematically illustrates a control module according to an embodiment of the invention;

fig. 6 schematically illustrates a bendable wireless charging apparatus according to another embodiment of the present invention;

fig. 7 shows an example of a bendable wireless charging apparatus according to the embodiment shown in fig. 6;

Fig. 8 schematically illustrates a bendable wireless charging apparatus according to the embodiment shown in fig. 6;

fig. 9 depicts a flexible battery configuration that may be used with the flexible wireless charging device shown in fig. 1;

Fig. 10 depicts a Jellyroll battery configuration that may be used with the flexible wireless charging device shown in fig. 1; and

fig. 11A and 11B illustrate the structure of the sponge diaphragm of the present invention and the corresponding prior art, respectively.

Detailed Description

in the following description, various flexible batteries and flexible wireless charging devices are exemplified. It will be apparent to those skilled in the art that modifications, including additions and/or substitutions, may be made without departing from the scope and spirit of the invention. To avoid obscuring the present invention, detailed descriptions may be omitted; however, the written description enables one skilled in the art to practice the teachings herein without undue experimentation.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a bendable wireless charging apparatus according to an embodiment of the present invention; fig. 2 is an exemplary view illustrating a bendable wireless charging apparatus according to an embodiment of the present invention. In this embodiment, the bendable wireless charging apparatus 10 includes a flexible substrate 100, a substantially planar receiving coil 20, a flexible battery 40, a flexible EMI shielding (electromagnetic interference shielding) layer 102, and a control module 30. The substrate 100 has an operable bend radius of at least 90 degrees. The term "operable bend radius" means that the charging device can be bent to at least 90 degrees and still have electrical and mechanical functionality. Further, it is also possible that it may still function properly when bent up to 120 degrees or 180 degrees (half stacked on top of each other). The receiving coil 20 is disposed on the surface of the substrate 100, and is used to receive electric power from the external transmitting induction coil 11. The external transfer inductor is typically connected to a power source, such as a conventional wall outlet, or to a computer power source through a USB port. It is noted that the battery 40 may be a flexible battery, and the details will be described later. Alternatively, it can be a very small battery, such as a button cell or membrane cell, which allows the charging device to be switched on and off without interference due to its small size. The flexible battery 40 is located under another surface of the substrate 100 that may also be disposed with the receiving coil 20. An EMI shielding layer 102 is disposed between the receiving coil 20 and the flexible battery 40. The control module 30 is disposed or formed on a side of the substrate 100 adjacent to the receiving coil 20, and is electrically connected to the receiving coil 20 and the flexible battery 40, respectively.

The control module 30 may also include a first output connection set 300 formed with two electrodes 302, 304 (e.g., conductive pads) representing the positive and negative terminals of the respective flexible batteries 40.

further, referring to fig. 3, fig. 3 is an exemplary diagram showing a cross-sectional view of a bendable wireless charging device without a flexible battery. The receiving coil 20 is composed of a metal layer 202 and at least one cover layer 204 attached to the metal layer 202, wherein the metal layer 202 is fabricated on the flexible substrate 100 by using an additive or subtractive coating method. The material of the metal layer 202 may be copper, silver, a copper alloy, a silver composite, or a combination thereof. The at least one capping layer 204 protects the metal layer 202 from mechanical damage or oxidation, and it may also include an optional adhesive layer (not shown) over the metal layer 202, the capping layer 204 being on the optional adhesive layer. The material of the substrate 100 and the cover layer 204 may be a Polyimide (PI) sheet, Polyetheretherketone (PEEK), transparent conductive polyester film, elastomeric film, polyethylene terephthalate (PET), or a combination thereof.

the thickness of the metal layer 202 is in the range of 5-100 μm and the thickness of the substrate 100 or the cover layer 204 is in the range of 2-100 μm.

the EMI shielding layer 102 may be formed of an electromagnetic wave absorbing material or an electromagnetic wave reflecting material (e.g., a thermoplastic or elastomeric material or a combination thereof) with an electrically conductive metal film or powder or fibrous filler (e.g., metal/carbon powder or fibers). Exemplary EMI shielding materials include copper and nickel coated polyurethane sheets, silicone rubber with embedded magnetic ferrite particles.

Referring to fig. 4, fig. 4 shows an exemplary diagram of one implementation of a wireless charging apparatus according to an embodiment of the invention. In this embodiment, the wireless charging device is mounted on the outer surface of a helmet. As shown in fig. 4, the wireless charging device 10 is curved in an arc shape along the contour of the helmet 50.

The receiving coil of the bendable wireless device according to the present invention is capable of withstanding at least 2000 repeated bends (bend radius at 20-40mm and bend angle of at least 120 degrees) without loss of charging performance.

reference is made to fig. 1, 2 and 5. FIG. 5 is a schematic diagram of a control module according to an embodiment of the invention. In this embodiment, the control module 30 includes a wireless charging circuit 300, a battery charging circuit 320, and a protection circuit 340 connected in series.

The wireless charging circuit 300 is electrically connected to the receiving coil 20. The battery charging circuit 320 regulates the voltage and current from the wireless charging circuit 300 and outputs the regulated voltage and current to the protection circuit 340.

The protection circuit is connected to the flexible battery through the first output connection set, and further includes a switch module 360 connected between the protection circuit and the flexible battery. The protection circuit is used for sensing and controlling the switch module. When the current or voltage inputted from the battery charging circuit exceeds or falls below a predetermined value, the switching module is turned OFF, so that erroneous charging of the flexible battery can be prevented. The predetermined value may be defined as a threshold value for corresponding scenarios including short circuit, overcharge, and undercharge. One skilled in the art will recognize that the predetermined value may vary based on the intended use or type of flexible battery. For example, the over-voltage range measured between the first set of output connections may be selected to be 3.5 volts to 5 volts, and the under-voltage range may be selected to be 2 volts to 3 volts.

refer to fig. 6 to 8. Fig. 6 is a schematic diagram of a bendable wireless charging apparatus according to another embodiment of the invention; fig. 7 is an exemplary view illustrating a bendable wireless according to the embodiment shown in fig. 6; FIG. 8 is a schematic diagram of a control module according to the embodiment shown in FIG. 6. This embodiment is similar to the embodiment shown in fig. 1. The difference is that the control module of the embodiment shown in fig. 6 further includes: a second output connection group 310 and a switch module 361, wherein the second output connection group 310 is electrically connected to an external load, system or electronic device (hereinafter referred to as "load 60"), and the switch module 361 is composed of a charging switch and a discharging switch cascaded in series.

In this embodiment, as shown in fig. 6 and 7, the control module 30 is located on a side of the substrate 100 adjacent to the receiving coil 20 and is electrically connected to the receiving coil 20, the flexible battery 40 and the load 60 for controlling a charging process of the flexible battery 40 and/or a discharging process to the load 60. The flexible battery 40 is positioned under the EMI shielding layer 102. The load 60 is not shown in fig. 7, but may be considered to be any type of battery-powered electronic device, such as a wireless power toothbrush, a watch, or glasses. Those skilled in the art will recognize that the implementation and configuration of wireless charging of these devices may be different, as the flexible wireless charging apparatus of the present invention will typically be provided in the respective devices with its flexibility.

As shown in fig. 8, the switch module 361 includes a charge switch 362 and a discharge switch 363. In this embodiment, each of the charge switch 362 and the discharge switch 363 may be an N-type MOSFET (metal oxide semiconductor field effect transistor). Each MOSFET has a gate, a drain and a source. Gates of the charge switch 362 and the discharge switch 363 are connected to the protection circuit 340, respectively. Drains of the charge switch 362 and the discharge switch 363 are connected to each other. A source of the charge switch 362 is connected to the negative terminal of the load 60. A source of the discharge switch 363 is connected to a negative terminal of the flexible battery 40. The positive terminals of the flexible battery 40 and the load 60 are connected to a common node.

the battery charging circuit 320 regulates the voltage and current from the wireless charging circuit 300 and outputs the regulated voltage and current to the protection circuit 340 through VBAT shown in fig. 8. The protection circuit 340 will continuously monitor the flexible battery 40 and the load 60 by detecting the voltage and/or current conditions of the flexible battery 40 and the load 60.

As described in the above paragraphs, the protection circuit 340 includes a plurality of predetermined values for determining whether the bendable wireless charging apparatus of the present invention is operating normally. When the voltage detected during charging or discharging is higher or lower than some predetermined value, the protection circuit 340 will selectively lower the voltage on the gate of the charge switch 362 during charging or the voltage on the gate of the discharge switch 363 during discharging. Since the gate voltage is low, the charge switch 362 and the discharge switch 363 will be switched OFF (OFF), so the protection circuit 340 will be in an open (open) state due to the large resistance of the OFF (OFF) MOSET type switch.

In contrast, for a conventional wireless charging apparatus without an additional (i.e., second) set of output connections, the corresponding external load or electronic device may still be connected to and draw power from the battery. The wireless charging apparatus of the present invention, having the second output connection group connected to the protection circuit of the control module, is advantageous in that it can not only prevent the battery from being damaged by overcharge or overdischarge of the battery during charging and discharging, but also wirelessly charge the battery and simultaneously discharge the battery to a load; thus, the utility and convenience of the present invention are enhanced.

Fig. 9 schematically illustrates a cross-section of a portion of a flexible and foldable lithium ion battery according to one aspect of the present disclosure, which may be used as a battery 40 in a bendable wireless charging apparatus of the present invention. The battery 40 has an operating bend radius of 180 degrees. The term "operational bend radius" as used herein refers to the degree to which a battery can be bent to still produce power without interruption of operation. An operating bend radius of 180 degrees means that the battery can fold completely on itself while still generating power.

In fig. 9, the element 5 represents a cell (single cell) of a battery (battery) including a first current collector 521, a second current collector 531, and a separator 51. The first current collector 521 may be selected from metals such as aluminum. The aluminum may be a sheet having a thickness of about 5 microns to about 100 microns. The active material 522 may be coated on one or both sides of the aluminum sheet to form a cathode. The active material may be selected from, for example, LiCoO2, LiMn2O4, Li2MnO3, LiNiMnCoO2, LiNiCoAlO2, LiFePO4, or lini0.5mn1.5o4, although other active materials and mixtures thereof may also be used.

The second current collector may be selected from metals such as copper. The copper may be a sheet having a thickness of about 5 microns to about 100 microns. The active material 532 may be coated on one or both sides of the copper sheet to form an anode. Active materials for the anode include carbon-based active materials such as graphite, carbon nanotubes, graphene, silicon/carbon composites, germanium, tin, metal oxides, metal hydrides, and mixtures thereof.

The separator 51 is located between the collectors to prevent the collectors from contacting each other. The separator 51 is a highly porous highly elastic polymer fiber felt sponge having a resilient force sufficient to maintain the separation of the current collectors 521 and 531 regardless of the bending, folding, cutting or penetration of foreign matter into the battery. The term "sponge" as used herein refers to a porous, absorbent, and elastic structure that retains liquid while also retaining resiliency. The sponge returns to its original shape after deformation. That is, the sponge can be squeezed into a smaller area as long as the external force is maintained; once the external force is removed, the sponge recovers its original shape and volume. The separator acts as a sponge, firmly holding the liquid electrolyte, but when the battery case is pierced or cut, the separator also maintains sufficient absorption capacity to maintain the liquid electrolyte in a leak-free state, thereby preventing the escape of harmful electrolyte. In addition, the resilient force of the sponge diaphragm enables the electrodes to return to their proper separated position after mechanical injury (e.g., cutting and puncturing), thereby imparting self-healing properties to the overall structure. The term "self-healing" as used herein refers to a battery structure that can return to its original configuration after a mechanical injury, such that power continues to be generated after the power interruption caused by the mechanical injury. The sponge diaphragm can be restored to the original shape and volume due to the sponge characteristic, so that the whole battery structure can be self-restored.

The electrolyte used in the battery may include one or more organic solvents, such as one or more of ethylene carbonate, dimethyl carbonate, and diethyl carbonate. Dissolved in the solvent is one or more lithium salts, such as LiPF6, LiBF4, or LiClO 4. The composition of the electrolyte is typically adjusted based on the active materials selected for the cathode and anode.

Although fig. 9 shows a cell based on a cell in a stack structure, the layers of the assembly may be formed and rolled into a so-called "jelly roll" structure, as shown in fig. 10. In fig. 10, a separator layer 51 is positioned not only between the cathode and anode of each "cell" layer, but also between adjacent cell layers to prevent shorting between the electrodes, thereby creating a self-healing, overall flexible and resilient structure.

the sponge membrane may be formed from a mat of submicron fibers. In one aspect, the fibers may have a diameter between about 100nm and 300 nm. The porosity may be from about 60% to about 90% with an average pore size of less than about 1 micron. In particular, the sub-micron fibers may be made of polymers such as polyvinylidene fluoride (PVDF), Polyimide (PI), Polyamide (PA), Polyacrylonitrile (PAN), polyethylene terephthalate (PET), poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), (vinylidene fluoride-chlorotrifluoroethylene) copolymer (PVDF-co-CTFE), or mixtures thereof.

in another embodiment, the sponge membrane may be a nonwoven polymeric fiber mat in which the polymeric fibers are a composite of a first polymeric material and a second polymeric material. The first polymeric material may include poly (vinylidene fluoride) (PVDF), Polyimide (PI), Polyamide (PA), or Polyacrylonitrile (PAN). The second polymeric material may include polyethylene glycol (PEG), Polyacrylonitrile (PAN), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), or (vinylidene fluoride-chlorotrifluoroethylene) copolymer (PVDF-co-CTFE), wherein the second polymeric material is different from the first polymeric material. The weight ratio of the first and second polymeric materials can be in the range of about 3:1 to about 1:1, more specifically about 3:1 to about 2:1, more specifically about 3:1 to about 3:2, and more specifically about 3: 1.

PVDF is widely used in the manufacture of ultrafiltration and microfiltration membranes due to its excellent chemical resistance and good thermal stability. Pure PVDF polymer has a high melting point and crystallinity, and has good mechanical properties. However, it is soluble only in a limited kind of solvents such as N-methyl-2-pyrrolidone (NMP), N-Dimethylacetamide (DMAC), N-Dimethylformamide (DMF), Dimethylsulfoxide (DMSO), and shows low swelling ability upon soaking in a common electrolyte.

PVDF-HFP copolymers can improve electrolyte solubility, making the polymers soluble in common organic solvents such as acetone and Tetrahydrofuran (THF), which can further improve processability. Furthermore, it has a very high expansion capacity, which may enhance the electrolyte absorption of the separator layer.

The inventors of the present application have found that composites of PVDF and PVDF-HFP provide a number of advantages over other polymers in the manufacture of membranes, such as: electrochemical stability from 0V to 5V over Li +/Li; better solubility than pure PVDF alone, which can enhance processability; the electrolyte wets faster than PVDF; better control of electrolyte leakage; permanently adhering to the electrode; and good flexibility.

The composite material may be formed into a nonwoven fiber mat by electrospinning, as described in further detail below. Electrospinning can be done from the polymer formulation onto aluminum foil to obtain a free-standing separator. The polymeric formulation may include a total amount of the first and second polymeric materials in the range of about 15 to 25 weight percent of the formulation, preferably about 15 to 20 weight percent, and more preferably about 16.5 weight percent. The polymer formulation used for electrospinning to obtain a sponge separator may further comprise about 1-5 wt%, preferably about 2-5 wt%, more preferably about 3-5 wt%, most preferably about 5 wt% of at least one additive. The additive may be lithium chloride (LiCl) to facilitate ion transfer across the separator and to facilitate the electrospinning process by increasing the conductivity of the polymer solution. In a preferred embodiment, the polymer formulation may contain LiCl in an amount of about 0.1 to 0.6. mu.g, preferably about 0.1 to 0.5. mu.g, more preferably about 0.2 to 0.4. mu.g, most preferably about 0.3 to 0.4. mu.g.

In another embodiment, in combination with any of the above and below embodiments, the polymer formulation used to electrospun to obtain the nonwoven nanofiber membranes of the present application may comprise at least one solvent selected from the group consisting of: n-methyl-2-pyrrolidone (NMP), N-Dimethylacetamide (DMAC), N-Dimethylformamide (DMF), dimethyl sulfoxide (DMSO), acetone, and Tetrahydrofuran (THF). In a preferred embodiment, the polymer formulation may include DMF and acetone. In another preferred embodiment, the polymer formulation may include DMF and acetone in a weight ratio of about 3:1 to about 1:1, preferably about 2:1 to about 1:1, more preferably about 1.5:1 to 1:1, most preferably about 1.25: 1.

In another embodiment, in combination with any of the above and below embodiments, the nonwoven nanofiber membrane of the present application may be electrospun by: adding first and second polymeric materials to at least one solvent, optionally together with LiCl; heating the resulting mixture at about 80-100 deg.C and stirring for about 2-5 hours; optionally adding at least one additive, followed by heating at about 80-100 deg.C for about 2-5 hours; cooling the polymer formulation solution to room temperature; and the polymer formulation solution was loaded into a delivery cylinder (carriage) for electrospinning.

The electrostatic spinning of the sponge diaphragm of the present application can be performed under the following parameters: temperature: about 20 ℃ to about 30 ℃; voltage: about 20-50 kV; relative Humidity (RH): about 25-60%; height of the spinning device: 100-; the feeding rate is as follows: 5.5-8.5 ml/h.

On the other hand, additives of tetramethyl orthosilicate (TMOS) or tetraethyl orthosilicate (TEOS) may be used with the polymer formulation. These additives can hydrolyze into ceramic components, thereby improving the surface texture of the sponge separator and increasing dimensional stability.

the microstructure of an exemplary sponge diaphragm is shown in fig. 11A; as shown in fig. 11A, the individual fibers are easily distinguished and form many pores with a porosity of about 80%. In contrast, the microstructure of a prior art commercial separator (Celgard 2400 polypropylene separator) having about 40% porosity is shown in fig. 11B. In such lower porosity structures, the individual fibers are not readily distinguishable. The individual interconnected fibers in the sponge of fig. 11A produce a flexible and resilient sponge separator that contributes to the self-recovery characteristics of the batteries of the various embodiments.

While the application has been described in terms of several embodiments and implementations thereof, the application is not limited thereto but covers various obvious modifications and equivalent arrangements, which fall within the purview of the appended claims. Although features of the application are presented in certain combinations between the claims, it is contemplated that these features can be arranged in any combination and order.

Claims

1. a bendable wireless charging device, comprising:

A flexible substrate having an operable bend radius of at least 90 degrees;

A substantially planar receiving coil for receiving electrical energy from an external transmitting inductor and disposed on a surface of the flexible substrate;

A flexible battery having a bend radius of at least 90 degrees operable;

A flexible EMI shield layer positioned between the receiver coil and the flexible battery for blocking electromagnetic interference from the receiver coil;

And the control module is positioned or formed at one side of the flexible substrate, is adjacent to the receiving coil and is electrically communicated with the receiving coil and the battery, wherein the control module is used for controlling the charging process of the flexible battery and the discharging process of the load.

2. The apparatus of claim 1, wherein the control module further comprises a first set of output connections and a second set of output connections, wherein the control module is connected to the flexible battery through the first set of output connections and to the load through the second set of output connections.

3. The apparatus of claim 1, wherein the control module further comprises a wireless charging circuit, a battery charging circuit, and a protection circuit connected in series, wherein the wireless charging circuit is connected to the receiving coil, and a switch module is connected between the protection circuit and the flexible battery.

4. The apparatus of claim 3, the switch module comprising a charge switch and a discharge switch connected in series.

5. The apparatus of claim 4, wherein the protection circuit selectively turns on and off a charge switch during charging or selectively turns on and off a discharge switch during discharging by comparing a predetermined value with a voltage and/or current of the flexible battery or the load.

6. the apparatus of claim 4, wherein the charge switch and the discharge switch are MOSFET devices having a gate, a drain, and a source,

The grid electrode of the charging switch and the grid electrode of the discharging switch are respectively connected to the protection circuit;

The drain electrode of the charging switch and the drain electrode of the discharging switch are connected with each other;

a source of the charge switch is connected to a negative terminal of the load;

the source of the discharge switch is connected to the negative terminal of the flexible battery, and the positive terminal of the flexible battery and the positive terminal of the load are connected to a common node.

7. The device of claim 1, wherein the flexible battery is a lithium ion battery.

8. The device of claim 7, wherein the lithium ion battery comprises an electrospun polymer fiber sponge separator.

9. The apparatus of claim 8, wherein the lithium ion battery is a self-healing lithium ion battery.

10. A bendable wireless charging device, comprising:

a flexible substrate having an operable bend radius of at least 90 degrees;

A battery;

A flexible EMI shield layer positioned between the receiver coil and the battery for blocking electromagnetic interference from the receiver coil;

a control module located or formed on one side of the flexible substrate adjacent to the receiving coil and in electrical communication with the receiving coil, the battery and an external load, wherein the control module is configured to control a charging process of the battery.

11. The apparatus of claim 10, wherein the control module further comprises a first output connection set having two electrodes on the flexible substrate, wherein the two electrodes are electrically connected to two ends of the battery, respectively.

12. The apparatus of claim 11, wherein the control module further comprises a wireless charging circuit, a battery charging circuit, and a protection circuit connected in series, wherein the wireless charging circuit is connected to the receiving coil, and a switching module is connected between the protection circuit and the battery.

13. The apparatus of claim 12, wherein the protection circuit selectively turns the switching module on and off during charging by comparing a predetermined value with a voltage and/or current of the flexible battery.

14. The apparatus of claim 10, wherein the receive coil is comprised of a metal layer and at least one cover layer attached to the metal layer, wherein the metal layer is fabricated on the flexible substrate by additive or subtractive coating.

15. The apparatus of claim 14, wherein the metal layer is selected from the group consisting of copper, silver, copper alloys, silver composites.

16. The apparatus of claim 14, wherein the at least one capping layer protects the metal layer from mechanical damage or oxidation.

17. The apparatus of claim 14, wherein said receiver coil further comprises an adhesive layer over said metal layer, said cover layer being over said adhesive layer.

18. The apparatus of claim 14, wherein the material of the flexible substrate and the cover layer comprises a Polyimide (PI) sheet, Polyetheretherketone (PEEK), transparent conductive polyester film, elastomeric film, polyethylene terephthalate (PET), or a combination thereof.

19. the apparatus of claim 14, wherein the metal layer has a thickness in a range of about 5-100 μ ι η, and the flexible substrate and the cover layer have a thickness in a range of about 2-100 μ ι η.

20. The apparatus of claim 10, wherein the flexible EMI shielding layer is selected from the group consisting of metal-coated polymers or polymers with embedded conductive particles or fibers, polyurethane sheets, silicone rubber with embedded magnetic ferrite particles, polyesters, elastomers, and combinations thereof.