CN114142790B - Knapsack and power generation mechanism - Google Patents

Abstract

The present invention provides a backpack and a power generation mechanism, comprising a backpack body and a power generation mechanism arranged on the backpack body, the power generation mechanism comprising an IBC solar cell, the IBC solar cell having a first electrode and a second electrode located on the back thereof, the first electrode and the second electrode being arranged up and down; the power generation mechanism further comprises: a friction plate, which contacts the back of the IBC solar cell and can move up and down relative to the IBC solar cell, the friction plate being made of an insulating material having an electron-accepting capacity greater than that of the first electrode and the second electrode; wherein the power generation mechanism has at least a first state and a second state, in the first state, the friction plate contacts the first electrode and is separated from the second electrode; in the second state, the friction plate contacts the second electrode and is separated from the first electrode. The backpack of the present invention has a photovoltaic power generation function, can convert mechanical energy generated by a user when walking into electrical energy, and has a high electrical energy output power.

Description

Backpack and power generation mechanism

Technical Field

The invention belongs to the field of photovoltaics, and in particular relates to a backpack and a power generation mechanism.

Background Art

Solar backpacks integrate solar panels on the backpack, which can use solar power to recharge the electronic products carried during outdoor sports. However, solar power generation is greatly affected by weather, sun angle, and backpack orientation, and cannot provide electricity continuously and stably. When users carry a backpack and exercise, a large amount of mechanical energy will be generated. If this mechanical energy can be collected and utilized, the power generation efficiency can be improved.

Summary of the invention

In view of the above problems, one object of the present invention is to provide a backpack which has a photovoltaic power generation function and can also convert the mechanical energy generated by the user when walking into electrical energy, and has a higher electrical energy output power.

Another object of the present invention is to provide a power generation mechanism that has a photovoltaic power generation function and can also convert the mechanical energy generated during the movement into electrical energy, with a higher electrical energy output power.

In order to achieve the above object, the technical solution adopted by the present invention is:

A backpack includes a backpack body and a power generation mechanism disposed on the backpack body, wherein the power generation mechanism includes an IBC solar cell, wherein the IBC solar cell has a first electrode and a second electrode located on the back side thereof, wherein the first electrode and the second electrode are disposed up and down; and the power generation mechanism further includes:

a friction plate, which contacts the back surface of the IBC solar cell and can move up and down relative to the IBC solar cell, wherein the friction plate is made of an insulating material having an electron receiving capacity greater than that of the first electrode and the second electrode;

The power generation mechanism has at least a first state and a second state. In the first state, the friction plate contacts the first electrode and is separated from the second electrode; in the second state, the friction plate contacts the second electrode and is separated from the first electrode.

Preferably, the number of the friction plates is multiple and they are spaced apart in an upper and lower manner, and the orthographic projections of each friction plate and the gap between two adjacent friction plates on the back side of the IBC solar cell are respectively covered by the orthographic projections of the first electrode or the second electrode or coincide with the orthographic projections of the first electrode or the second electrode, respectively. When the power generation mechanism is in the first state, each friction plate covers one first electrode, and the second electrodes between the covered first electrodes are opposite to the gap; when the power generation mechanism is in the second state, each friction plate covers one second electrode, and the first electrodes between the covered second electrodes are opposite to the gap.

Preferably, the IBC solar cell has a first polarization portion and a second polarization portion located on the back side thereof, the left end of each of the first electrodes is in contact and conduction with the first polarization portion, and the right end of each of the second electrodes is in contact and conduction with the second polarization portion; the left end of each of the friction plates is connected via a first connecting portion, and the right end of each of the friction plates is connected via a second connecting portion; the first connecting portion and the first polarization portion are arranged opposite to each other, and the second connecting portion and the second polarization portion are arranged opposite to each other.

Preferably, the number of the friction plates is less than half of the number of the first electrodes or the second electrodes.

Preferably, the power generation mechanism further includes an upper frame and a lower frame, the IBC solar cell is connected between the upper frame and the lower frame, and the friction plate is connected between the upper frame and the lower frame so as to be movable up and down.

Preferably, an elastic member is provided between the friction plate and the upper frame and/or the lower frame.

Preferably, the triboelectric charge density of the insulating material is less than -80 μCm ^-2 .

Preferably, the insulating material is selected from one or more of PDMS, PTFE and FEP.

Preferably, the power generation mechanism further comprises an insulation reinforcement plate, and the friction sheet is coated on a surface of the insulation reinforcement plate on a side opposite to the IBC solar cell.

Preferably, the power generation mechanism further comprises a panel and a packaging material located between the panel and the front side of the IBC solar cell.

Preferably, the backpack body comprises a main body for forming an accommodating space and a shoulder strap for tying the main body to the user's body, and the power generation mechanism is arranged on a side of the main body farther from the user's body.

The present invention also adopts the following technical solution:

A power generation mechanism, wherein the power generation mechanism is the power generation mechanism as described above.

The present invention adopts the above technical solution, which has the following advantages compared with the prior art:

A backpack of the present invention has an IBC solar cell capable of performing photoelectric conversion to generate photovoltaic power. A power generation mechanism is provided on the backpack body, wherein a friction plate can contact and rub with a first electrode and a second electrode respectively. Due to the difference in the electron-accepting ability of the friction plate and the two electrodes, static charges are accumulated on the friction plate, and a potential difference is generated between the first electrode and the second electrode through electrostatic induction, and electric energy is output externally, so that the friction between the two electrodes can be converted into electric energy when the backpack moves with the user. In the case of insufficient light, the backpack can also generate electricity by converting mechanical energy into electric energy, output electric energy more stably, and improve the power generation capacity. The friction plate converts mechanical energy into electric energy by using the electrodes of the IBC solar cell, has a compact structure, can be installed on the backpack as a whole, and is easy to install.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

FIG1 is a schematic structural diagram of a backpack according to an embodiment of the present invention;

FIG2 is a schematic structural diagram of a power generation mechanism according to an embodiment of the present invention;

FIG3 shows the shapes of a friction plate and an IBC solar cell according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a friction plate at a certain position on an IBC solar cell according to an embodiment of the present invention.

in,

1. Backpack body; 10. Main body; 11. Shoulder strap; 2. Power generation mechanism; 20. IBC solar cell; 201. First electrode; 202. Second electrode; 203. First polarization part; 204. Second polarization part; 21. Friction plate; 211. Gap; 22. First connecting part; 23. Second connecting part; 24. Insulation reinforcement plate; 25. Upper frame; 26. Lower frame; 27. Spring; 28. Panel; 29. Packaging material; 3. Sunlight.

DETAILED DESCRIPTION

The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

As shown in the present invention, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. The term "and/or" used herein includes any combination of one or more related listed items.

As shown in FIG1 , a backpack of the present embodiment includes a backpack body 1 and a power generation mechanism 2 disposed on the backpack body 1. The backpack body 1 includes a main body 10 for forming a storage space and a shoulder strap 11 for tying the main body 10 to the user's body, and the power generation mechanism 2 is disposed on a side of the main body 10 that is farther from the user's body. Specifically, the main body 10 has a rear piece that is close to the user's body and can contact each other, a front piece that is farther from the user's body and faces outward, and a side portion connected between the rear piece and the front piece, and the power generation mechanism 2 is disposed on the front piece of the main body 10. The rear piece is usually specially designed according to ergonomics. The present embodiment can effectively avoid changing the rear piece of the main body 10, thereby not affecting the comfort of use of the backpack.

As shown in FIG. 2 , the power generation mechanism 2 includes an IBC solar cell 20, and the IBC solar cell 20 has a first electrode 201 and a second electrode 202 located on the back side thereof (specifically, the backlight side of the IBC solar cell), and the first electrode 201 and the second electrode 202 are arranged up and down. There are a plurality of first electrodes 201 and a plurality of second electrodes 202, and the first electrodes 201 and the second electrodes 202 are arranged in an interdigitated manner. The first electrodes 201 and the second electrodes 202 are insulated from each other.

The power generation mechanism 2 also includes a friction plate 21, which contacts the back of the IBC solar cell 20 and can move up and down relative to the IBC solar cell 20. The friction plate 21 is made of an insulating material with an electron-acquiring ability greater than that of the first electrode 201 and the second electrode 202. The insulating material used in this embodiment is an insulating material with a triboelectric charge density less than -80μCm ^-2 . For details, see the article "Quantifying the triboelectric series" published by Haiyang Zou, Ying Zhang, Litong Guo, Peihong Wang, Xu He, Guozhang Dai, Haiwu Zheng, Chaoyu Chen, Aurelia Chi Wang, Cheng Xu and Zhong Lin Wang in Nature Communication. Specifically, the insulating material selected is one or more of polydimethylsiloxane (PDMS), polytetrafluoroethylene (PTFE) or perfluoroethylene propylene copolymer (FEP).

As shown in FIG. 2 to FIG. 4 , the number of friction plates 21 is multiple and they are arranged at intervals in the upper and lower parts. The orthographic projection of each friction plate 21 on the back of the IBC solar cell 20 is covered by the orthographic projection of the first electrode 201 or the second electrode 202 or coincides with the orthographic projection of the first electrode 201 or the second electrode 202, respectively. The orthographic projection of the gap 211 between two adjacent friction plates 21 on the back of the IBC solar cell 20 is covered by the orthographic projection of the first electrode 201 or the second electrode 202 or coincides with the orthographic projection of the first electrode 201 or the second electrode 202. Further, the shape and size of each friction plate 21 are the same, the shape and size of the gaps 211 between all friction plates 21 are the same, and the shape and size of each friction plate 21, each gap 211, each first electrode 201, and each second electrode 202 are the same.

The power generation mechanism 2 has at least a first state and a second state. In the first state, the friction plate 21 contacts the first electrode 201 and is separated from the second electrode 202; in the second state, the friction plate 21 contacts the second electrode 202 and is separated from the first electrode 201. When the power generation mechanism 2 is in the first state, each friction plate 21 covers a first electrode 201, and the second electrodes 202 between the covered first electrodes 201 are opposite to the gap 211; when the power generation mechanism 2 is in the second state, each friction plate 21 covers a second electrode 202, and the first electrodes 201 between the covered second electrodes 202 are opposite to the gap 211. When the power generation mechanism 2 is in the first state, the friction plate 21 just completely covers the first electrode 201 and has no contact with the second electrode 202; when the power generation mechanism 2 is in the second state, the friction plate 21 just completely covers the second electrode 202 and has no contact with the first electrode 201.

As shown in FIG3 , the IBC solar cell 20 has a first polarization portion 203 and a second polarization portion 204 located on the back side thereof, the left end of each first electrode 201 is in contact with the first polarization portion 203, and the right end of each second electrode 202 is in contact with the second polarization portion 204; the left end of each friction plate 21 is connected via a first connecting portion 22, and the right end of each friction plate 21 is connected via a second connecting portion 23. The friction plate 21 is integrally arranged with the first connecting portion 22 and the second connecting portion 23 to move synchronously. The first connecting portion 22 and the first polarization portion 203 are arranged opposite to each other and have a gap 211, and the second connecting portion 23 and the second polarization portion 204 are arranged opposite to each other and have a gap 211. Preferably, the length of the friction plate 21 is similar to the length of the first electrode 201 and the length of the second electrode 202, the width of the friction plate 21, the width of the gap 211 between the friction plates 21, the width of the first electrode 201 and the width of the second electrode 202 are similar, and the number of the friction plates 21 is less than half of the number of the first electrode 201 or the second electrode 202. Specifically in this embodiment, three friction plates 21 are connected between the first connecting portion 22 and the second connecting portion 23, and two gaps 211 are formed between the three friction plates 21; in the first state, the three friction plates 21 cover the three first electrodes 201 respectively, and the two second electrodes 202 between the three covered first electrodes 201 are aligned with the two gaps 211 so as not to contact the friction plates 21; similarly, in the second state, the three friction plates 21 cover the three second electrodes 202 respectively, and the two first electrodes 201 between the three covered second electrodes 202 are aligned with the two gaps 211 so as not to contact the friction plates 21.

The power generation mechanism 2 further includes an insulating reinforcement plate 24, and the friction plate 21 is covered on the surface of the insulating reinforcement plate 24 on the side opposite to the IBC solar cell 20. The insulating reinforcement plate is made of acrylic material, which has good insulation performance. Specifically, the friction plate 21 can be formed by patterning the above-mentioned insulating material with strong electron-accepting ability on the surface of one side of the insulating reinforcement plate 24 or by covering a patterned insulating material film made of the insulating material with strong electron-accepting ability. Preferably, the insulating reinforcement plate 24 is processed to form the same shape as the friction plate 21.

The power generation mechanism 2 further includes an upper frame 25 and a lower frame 26, the IBC solar cell 20 is fixedly connected between the upper frame 25 and the lower frame 26, and the friction plate 21 is connected between the upper frame 25 and the lower frame 26 so as to be movable up and down. An elastic member is provided between the friction plate 21 and the upper frame 25 and the lower frame 26. Specifically in this embodiment, the elastic member is a spring 27, and the number is four, wherein two springs 27 are connected between the insulation enhancement plate 24 and the upper frame 25, and the other two springs 27 are connected between the insulation enhancement plate 24 and the lower frame 26, and the friction plate 21 is covered on the insulation enhancement plate 24 so as to be connected between the frame and the lower frame 26 so as to be movable up and down through the four springs 27.

The power generation mechanism 2 also includes a panel 28 and a packaging material 29 located between the panel 28 and the front surface of the IBC solar cell 20. The panel 28 is glass or a transparent polymer, and the packaging material 29 is ethylene-vinyl acetate copolymer (EVA), polyethylene octene co-elastomer (POE) or polyvinyl butyral (PVB) with high permeability. The panel 28 and the packaging material are respectively connected between the upper frame 25 and the lower frame 26. The packaging material 29 is arranged on the front surface of the IBC solar cell, and the panel 28 is arranged on the front surface of the packaging material 29.

3 and 4, the working principle and process of the backpack are as follows:

Under light conditions, when the front side of the IBC solar cell 20 faces the sunlight, the sunlight passes through the panel 28 and the packaging material 29 and irradiates the front side of the IBC solar cell 20. The solar energy is absorbed by the IBC solar cell 20, converted into electrical energy, and output to the outside through the first electrode 201 and the second electrode 202.

When the user puts on the backpack and starts to move, the power generation mechanism 2 has a first state and a second state. In the first state, the friction sheet 21 contacts the first electrode 201 and is separated from the second electrode 202. At this time, the positive projection of the friction sheet 21 on the back of the solar cell just completely covers the first electrode 201, and the positive projection of the gap 211 between the friction sheets 21 on the back of the solar cell coincides with the positive projection of the second electrode 202; in the second state, the friction sheet 21 contacts the second electrode 202 and is separated from the first electrode 201. At this time, the positive projection of the friction sheet 21 on the back of the solar cell just completely covers the second electrode 202, and the positive projection of the gap 211 between the friction sheets 21 on the back of the solar cell coincides with the positive projection of the first electrode 201. In the process of switching between the first state and the second state of the power generation mechanism 2, the insulation reinforcement plate 24 and the friction sheet 21 covered thereon contact and rub with the first electrode 201 and the second electrode 202, and electrons are transferred from the first electrode 201 and the second electrode 202 to the friction sheet 21 with strong electron receiving ability, and static charge accumulates on the surface of the friction sheet 21. The power generation mechanism 2 continuously repeats the above process, and a large amount of static charge accumulates on the friction plate 21. These static charges perform alternating electrostatic induction on the first electrode 201 and the second electrode 202, so that a potential difference is generated between the first electrode 201 and the second electrode 202, thereby outputting electrical energy to the outside and converting mechanical energy into electrical energy.

The present embodiment provides a backpack and a power generation mechanism 2, wherein the IBC solar cell 20 can perform photoelectric conversion to generate photovoltaic power. The power generation mechanism 2 is provided on the backpack body 1. When the user puts on the backpack and starts to move, the friction plate 21 can contact and rub with the first electrode 201 and the second electrode 202 respectively. Since the electron-accepting ability of the friction plate 21 is stronger than that of the first electrode 201 and the second electrode 202, a large amount of static electricity accumulates on the friction plate 21 during the process of repeated contact and friction with the first electrode 201 and the second electrode 202, and an electric potential difference is generated between the first electrode 201 and the second electrode 202 through electrostatic induction, thereby outputting electrical energy to the outside. The backpack of this embodiment integrates the solar power generation function and the mechanical energy power generation function. It can generate electricity by converting mechanical energy into electrical energy even under insufficient light conditions, output electrical energy more stably, and improve the power generation power and efficiency. The upper frame 25 and the lower frame 26 of the power generation mechanism 2 are fixed to the backpack seat 12, so that the entire power generation mechanism 2 can be fixed to the backpack. It is easy to install, does not occupy the internal space of the backpack, and does not affect the normal use of the backpack. At the same time, the design of the back piece can make the user feel more comfortable when using it, which is in line with the concept of ergonomics. There is no electrode on the front of the IBC solar cell 20, which can make the appearance of the backpack more beautiful.

The above embodiment is only for illustrating the technical concept and features of the present invention, and is a preferred embodiment. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention.

Claims (8)

1. The backpack comprises a backpack body and a power generation mechanism arranged on the backpack body, and is characterized in that the power generation mechanism comprises an IBC solar cell, wherein the IBC solar cell is provided with a first electrode and a second electrode which are positioned on the back surface of the IBC solar cell, and the first electrode and the second electrode are arranged up and down; the power generation mechanism further includes:

A friction plate which is in contact with the back surface of the IBC solar cell and can move up and down relative to the IBC solar cell, wherein the friction plate is made of an insulating material with higher electron-obtaining capacity than the first electrode and the second electrode;

Wherein the power generation mechanism has at least a first state and a second state, and in the first state, the friction plate is in contact with the first electrode and separated from the second electrode; in the second state, the friction plate is contacted with the second electrode and separated from the first electrode;

Under the condition of illumination, the electrical energy converted by the IBC solar cell is externally output through the first electrode and the second electrode; when the backpack moves, a potential difference is generated between the first electrode and the second electrode so as to output electric energy to the outside;

The power generation mechanism further comprises an insulation reinforcing plate, an upper frame and a lower frame, wherein one side surface of the insulation reinforcing plate is coated with insulation materials in a patterning mode or is coated with patterned insulation material films made of the insulation materials in a pasting mode to form the friction plate, the upper frame and the lower frame are fixed on a front piece of the backpack body, the IBC solar cell is arranged between the upper frame and the lower frame, a spring is connected between the insulation reinforcing plate and the upper frame, and a spring is connected between the insulation reinforcing plate and the lower frame so as to allow the friction plate to move up and down relative to the IBC solar cell and be limited between the upper frame and the lower frame.

2. The backpack of claim 1, wherein the IBC solar cell comprises a plurality of first electrodes spaced apart from one another and a plurality of second electrodes spaced apart from one another, the first and second electrodes being staggered, the friction plate covering one or more of the first electrodes when the power generation mechanism is in the first state; the friction plate covers one or more of the second electrodes when the power generation mechanism is in the second state.

3. The backpack of claim 2, wherein the number of friction plates is plural and arranged at intervals up and down, the front projection of each friction plate and the gap between two adjacent friction plates on the back surface of the IBC solar cell is covered by or coincides with the front projection of the first electrode or the second electrode, respectively, each friction plate covers one of the first electrodes when the power generating mechanism is in the first state, and the second electrode between the covered first electrodes is opposite to the gap; when the power generation mechanism is in the second state, each friction plate covers one second electrode, and the first electrode between the covered second electrodes is opposite to the gap; the number of friction plates is less than half the number of the first electrodes or the second electrodes.

4. The backpack of claim 3, wherein the IBC solar cell has a first polarization and a second polarization on a back side thereof, a left end of each of the first electrodes being in contact with the first polarization, a right end of each of the second electrodes being in contact with the second polarization; the left end of each friction plate is connected through a first connecting part, and the right end of each friction plate is connected through a second connecting part; the first connecting portion and the first polarizing portion are disposed opposite to each other, and the second connecting portion and the second polarizing portion are disposed opposite to each other.

5. The backpack of claim 1, wherein an elastic member is disposed between the friction plate and the upper and/or lower rims.

6. The backpack of any one of claims 1 to 4 wherein the insulating material has a triboelectric charge density of less than-80 μcm ^-2.

7. The backpack of claim 6, wherein the insulating material is selected from one or more of PDMS, PTFE, FEP.

8. The backpack of any one of claims 1 to 4 wherein,

The power generation mechanism further comprises a panel and an encapsulation material positioned between the panel and the front surface of the IBC solar cell; and/or the number of the groups of groups,

The backpack body comprises a main body for forming a containing space and a strap for attaching the main body to the body of a user, and the power generation mechanism is arranged on one side of the main body far from the body of the user.