Portable solar liquid crystal writing board device and manufacturing method thereof

Abstract

The invention discloses a portable solar liquid crystal writing board device and a manufacturing method thereof, and belongs to the field of photovoltaic modules. A writing board comprises a solar module, a storage battery, a control module and a writing panel. The solar module comprises a battery piece, an insulating layer and a conducting layer; the writing panel is configured to be capable of changing colors through pressure change; the battery piece has a photovoltaic effect and transmits generated electric energy to the storage battery for storage; the battery piece and the conducting layer are arranged on the two end faces of the insulating layer respectively, and the control module is used for controlling on-off of electric connection between the storage battery and the writing panel and between the storage battery and the battery piece. Compared with the prior art, the writing board is light in weight, thin in thickness and convenient to carry, meets the integrated requirements of outdoor workers / students for charging, lighting and recording, has longer endurance through solar power generation, is low in production cost and has application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic modules, in particular to a portable solar liquid crystal writing board device and a manufacturing method thereof. BACKGROUND

[0002] Photovoltaic is the abbreviation of photovoltaic, which is a phenomenon of converting light into electricity. That is, using photovoltaic effect to make solar light on silicon material to produce current to generate electricity directly. The product produced according to this effect is a photovoltaic product. There are many photovoltaic products that use solar power to generate electricity: photovoltaic modules and components, large-scale photovoltaic power generation systems, rural photovoltaic power generation systems, distributed photovoltaic systems, balcony photovoltaic systems, and photovoltaic folding bags.

[0003] The traditional solar charging device has single function, only supports power supply, and lacks interaction and portable writing ability. The existing LED light belt is powered by mains or disposable battery, which has problems such as complex wiring, frequent battery replacement, and limited outdoor use. The liquid crystal writing board has the advantages of low power consumption and repeated erasing, but it needs independent battery power supply, has limited endurance and cannot generate electricity itself, and cannot work for a long time in long-term outdoor or power shortage environment. The charging and note recording of electronic equipment need to carry multiple devices, which is inconvenient to use. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a portable solar liquid crystal writing board device and a manufacturing method thereof.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A writing board, comprising:

[0007] A solar module, a battery, a control module and a writing panel; the solar module comprises a cell sheet, an insulating layer and a conductive layer;

[0008] The writing panel is configured to change color by pressure transformation;

[0009] The cell sheet has photovoltaic effect and transmits the generated electric energy to the battery for storage;

[0010] The cell sheet and the conductive layer are respectively arranged on the two end surfaces of the insulating layer, and the control module is used to control the on-off of the electrical connection between the battery and the writing panel and the electrical connection between the battery and the cell sheet.

[0011] Optionally, the cell sheet has a plurality of cell sheet assemblies, and the cell sheet assemblies are connected in series through the conductive layer.

[0012] Optionally, it further comprises a light belt welded on the conductive layer and powered by the battery.

[0013] Optionally, the conductive layer is formed by metal foil EVA glue compression molding.

[0014] Optionally, the front plate and the back plate are respectively attached to the end surface of the battery piece and the end surface of the insulating layer.

[0015] Optionally, it further comprises an interface for supplying power to the outside.

[0016] Optionally, the interface is USB or type-c.

[0017] Optionally, the writing panel is a liquid crystal panel with piezoelectric effect, and the plurality of liquid crystal units of the liquid crystal panel can change color or light transmission state by pressure; the control module is configured to apply an electric field to the liquid crystal unit to restore the color or light transmission state in the initial state.

[0018] Optionally, the front plate and the back plate are respectively attached by the front adhesive film and the back adhesive film; the front adhesive film and / or the back adhesive film are configured as EVA, POE, EPE or transparent silicone.

[0019] Optionally, the insulating layer is an EVA-PET-EVA composite film.

[0020] The beneficial effects of the present application are:

[0021] 1. Light weight, thin thickness, convenient to carry; solve the integrated needs of outdoor workers / students for charging, lighting, recording;

[0022] 2. Realize the dual functions of lighting and writing, suitable for use in power-free environment;

[0023] 3. Self-sufficient, can generate electricity cyclically, long service time;

[0024] 4. No glare design, low production cost, 40% lower than the purchase cost of separate equipment;

[0025] 5. Solar self-power supply reduces battery consumption, daily carbon emission reduction≈50g; BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings.

[0027] Figure 1 Structure diagram of solar liquid crystal writing panel, the left side is the front view, and the right side is the back view;

[0028] Figure 2 Front and back views of the solar assembly;

[0029] Figure 3 Sectional view of the solar assembly;

[0030] Figure 4 Device front circuit connection diagram, left side is the electrode point arrangement diagram of the battery piece, right side is the conductive layer circuit connection diagram;

[0031] Figure 5 Device circuit connection diagram. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] In some embodiments of the present application, a structure of a portable solar liquid crystal writing board device is disclosed, which comprises (as shown in Figures 1 to 4 ):

[0034] 1. The device comprises two layers A and B:

[0035] Layer A: located on the front of the device, mainly a solar module, as a power generation device, with a flexible LED light strip embedded inside;

[0036] Layer B: located on the back of the device, with a micro-power solar power management module, a battery, and a liquid crystal writing panel, which are pasted on the back of the solar module using silicone, and the micro-power solar power management module and the battery are provided with protective shells for protection.

[0037] 2. Solar module structure:

[0038] The solar module is composed of a front plate, a front adhesive film, a photovoltaic cell piece, an insulating layer, a conductive layer, a back adhesive film, a back plate, and an LED light strip. (as shown in Figure 2 、 3 )

[0039] 1) The solar module is designed to output a voltage of 5~10V and an output power of 5~20W;

[0040] 2) The front plate is a transparent material, which can be ETFE, PVDF / PET multi-layer composite plate (CPC), chemically enhanced ultra-thin glass (≤1.6 mm), or an integrated transparent plate of organic resin-glass fiber, with a thickness of 0.2~2mm;

[0041] 3) The front and back adhesive films use one or several of EVA, POE, EPE, and transparent silicone;

[0042] 4) BC solar cells are selected, with a quantity of 6 or more cells. The size of the cells varies according to the design requirements for voltage and power; length 40~200mm, width 40~100mm.

[0043] 5) The insulating layer uses an EVA-PET-EVA composite layer with a thickness of 0.1~0.4mm. The insulating layer has round holes with a diameter of 2~4mm at the corresponding points of the electrodes of the battery cell.

[0044] 6) The conductive layer uses copper foil to form the connection circuit, and the circuit connection direction is as follows: Figure 4 As shown, the conductive layer is connected to the electrode points of the battery cell via conductive adhesive; LED strips of different colors are connected between the positive and negative electrodes of the conductive layer.

[0045] 7) The back panel is made of PVDF / PET multilayer composite board (CPC) or organic resin-glass fiber integrated back panel with a thickness of 0.2~1mm; wherein, the liquid crystal display panel can be fixed on the back panel.

[0046] 3. The battery can store the electricity generated by the solar panel, provide power to the writing tablet, and also charge the mobile phone;

[0047] like Figure 5 As shown, in some embodiments of the present invention, the low-power solar power management module used in layer B of the device has a control circuit, a stable output interface, a USB interface, and a power control switch. The power control switch can control whether the battery provides power to the writing board or charges the mobile phone, and can also control the opening and closing of the entire circuit. The solar power management module has a starting voltage of ≤330 mV and a boost output of 5 V / 10V. The internal circuit control system includes: an energy management module connected to the battery → USB output, connected to the battery → LED light strip, and connected to the battery → LCD writing panel. The control unit can control the power supply to the LED light, writing panel, or USB interface.

[0048] 5. The passive LCD writing panel is attached to the back of the component and uses pressure-sensitive writing technology. It has a control switch for the writing panel, which can turn the writing panel on and off and also erase the content on the writing panel.

[0049] In some examples, liquid crystal writing panels can exhibit piezoresistive or piezoelectric effects. When pressure is applied, the resistance, capacitance, or charge of these materials changes, thereby generating a signal.

[0050] The material of a liquid crystal writing panel can be, for example, a cholesteric liquid crystal film, which is characterized by bistable properties. This means that under a specific voltage, the liquid crystal molecules will transition from one state (transparent) to another state (opaque or displaying color), and retain that state after the voltage is removed. In a passive liquid crystal writing panel, the pressure applied by the pen tip changes the molecular arrangement in a local area of ​​the liquid crystal film, thus leaving a mark.

[0051] When the erase switch is pressed, the control circuit applies an electric field to the entire liquid crystal film. This electric field exerts an external force on all the liquid crystal molecules, forcing them to rearrange into a neat and orderly state. In this state, light can penetrate the liquid crystal film, thus restoring the entire screen to the same color as the background.

[0052] In some examples of the present invention, a method for manufacturing a portable solar-powered liquid crystal writing board device is disclosed, which may include the following steps:

[0053] 1. Bill of Materials Preparation

[0054] Front panel: 1 piece of 0.3 mm CPC composite transparent film, size 350×250 mm.

[0055] Film: Prepare 1 piece of 260g / m2 EVA film (crosslinking degree 75~85%) and 1 piece of 560g / m2 POE film (crosslinking degree 75~85%), size 330×230mm.

[0056] Photovoltaic cells: BC monocrystalline cells, 12 cells, 46×91 mm, Voc per cell ≈ 0.7 V.

[0057] Insulation layer: EVA-PET-EVA three-layer composite film, 0.15 mm thick, 1 piece.

[0058] Conductive layer: 35 µm rolled copper foil is used, and the copper foil is laminated with the coating film, with a size of 330×230mm.

[0059] LED light strip: SMD 2835 white light, rated 5V, length 174mm, width 5mm.

[0060] Back panel: 1 piece of 0.3mm black CPC composite board, size 350×250mm.

[0061] Conductive adhesive: Conductive solder paste specifically for solar cells.

[0062] Low-power solar power management module: starting voltage ≤330 mV, boost voltage 5V / 2 A, with USB deactivation, integrated lithium battery charging + path management, and control switch.

[0063] Battery: Li-ion 3.7 V 4000 mAh, dimensions 65×40×8 mm.

[0064] LCD writing panel: 8.5 inches, operating voltage 5 V, power consumption ≤15W.

[0065] Silicone: Special silicone for solar modules, black.

[0066] 2. Equipment Manufacturing Process ("Level A")

[0067] Conductive layer fabrication, LED strip welding, insulating layer fabrication, lamination, cutting, and electrode hole drilling.

[0068] Step 1: Fabrication of the conductive layer

[0069] a. Copper foil and adhesive film (EVA) are hot-pressed together using a laminating machine at a lamination temperature of 80℃ and a lamination speed of 120mm / s.

[0070] b. Use a specialized scribing machine to create a fixed pattern on the surface of the copper foil, such as... Figure 5 The excess part is torn off to form a conductivity with a specific pattern. This circuit can realize the series connection between the positive and negative electrodes of two adjacent different cells. There is a 2mm insulation gap between the positive and negative electrodes of the same cell.

[0071] Step 2: LED strip welding

[0072] a. Cut a 174mm long LED strip and cut off the negative terminal at one end, leaving the positive terminal; cut off the positive terminal at the other end, leaving the negative terminal.

[0073] b. Connect the positive and negative terminals of the LED strip according to... Figure 4 The positions shown are soldered to the positive and negative pads of the copper foil using Sn63 / Pb37 solder wire and a 270°C soldering iron for manual spot soldering. After soldering, a DC power supply is used to check whether the circuit is connected correctly.

[0074] Step 3: Insulation layer fabrication: Using a laser drilling machine ( According to the design drawings, the insulating layer is opened at the positions corresponding to the positive and negative terminals of the battery cell. Round holes with a positioning accuracy of ±0.1 mm; square holes are made in the insulating layer corresponding to the position of the light strip to ensure that the LED beads can be exposed; the position positioning diagram of the battery cells is marked on the insulating layer.

[0075] Step 4: Stacking

[0076] Place them in order from bottom to top:

[0077] Backplate → Adhesive film → Copper foil conductive layer (including LED light strip) → Insulating layer (holes facing upwards) → Battery cell (electrode points aligned with holes) → Positive adhesive film → Front plate.

[0078] Alignment accuracy of each layer: ±0.5 mm.

[0079] 1) Conductive adhesive is printed on the electrode points of the battery cell;

[0080] 2) The insulating layer completely covers the underlying metal foil;

[0081] 3) The LED beads in the LED strip position are fully visible;

[0082] Step 5: Lamination: Place the stacked materials into a laminator for lamination.

[0083] Step 6 Cutting: Use a mechanical cutting machine to cut according to the design.

[0084] Step 7: Opening the back: At the designated locations on the design drawing, open the battery connection port and the light strip connection port respectively, with an opening size of 30×6mm.

[0085] 3. Electronic System Integration (“B Layer”)

[0086] Step 8 Connect the power management module to the battery: Solder the battery input and output pads of the micro-power solar power management module to the positive and negative output terminals of the battery using 0.5 mm² silicone wire (temperature resistant 150 ℃).

[0087] Step 9: Connection of power management module and component: Solder the total input pad of the micro-power solar power management module to the positive and negative terminals of the total output on the back of the component using 0.5 mm² silicone wire (temperature resistant 150 ℃). After soldering, use silicone to attach the micro-power solar power manager and battery to the back of the component.

[0088] Step 10: LED strip welding: Weld the output pads of the micro-power solar power management module to the positive and negative terminals of the main LED strip on the back of the module using 0.5 mm² silicone wire (temperature resistant 150 ℃).

[0089] Step 11: Install the writing panel

[0090] a. Use 1 mm thick double-sided 3M VHB tape to position the writing board around its perimeter, then apply RTV silicone sealant around the edges. Adhesive strip (adhesive amount 0.3 g / 10 mm), cure at room temperature for 24 h.

[0091] b. Connect the positive and negative terminals of the writing panel to the output pads of the low-power solar power management module, and connect the writing panel and the LED light strip in parallel.

[0092] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A writing tablet, characterized in that The solar module, the battery, the control module and the writing panel are included. The writing panel is configured to change color by pressure transformation. The battery piece has a photovoltaic effect and transmits the generated electric energy to the battery for storage. The battery piece and the conductive layer are respectively arranged on the two end surfaces of the insulating layer, and the control module is used to control the on-off of the electrical connection between the battery and the writing panel and between the battery and the battery piece. The battery piece has a plurality of battery piece assemblies, and the battery piece assemblies are connected in series through the conductive layer.

2. A writing tablet according to claim 1, wherein The lamp strip is welded on the conductive layer and powered by the battery.

3. The writing tablet of claim 1 wherein, The conductive layer is formed by metal foil EVA glue compression molding.

4. The writing tablet of claim 1 wherein, The end surface of the battery piece and the end surface of the insulating layer are respectively attached with a front plate and a back plate, and the front plate is configured as transparent or translucent material.

5. The writing tablet of claim 1 wherein, An interface for supplying power to the outside is further included.

6. The writing tablet of claim 1 wherein, The interface is USB or type-c.

7. A writing tablet according to claim 6, wherein The writing panel is a liquid crystal panel with piezoelectric effect, and a plurality of liquid crystal units of the liquid crystal panel can change color or light transmission state by pressure; the control module is configured to apply an electric field to the liquid crystal unit to restore it to the color or light transmission state in the initial state.

8. The writing tablet of claim 1 wherein, The front plate and the back plate are attached by front adhesive film and back adhesive film respectively; the front adhesive film and / or the back adhesive film are configured as EVA, POE, EPE or transparent silicone.

9. The writing tablet of claim 5 wherein, The insulating layer is an EVA-PET-EVA composite film.

10. The writing tablet of claim 1 wherein, ​

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