Solar panel sunshade

Abstract

To provide a solar panel sunshade that can generate a high output voltage capable of charging a vehicle drive battery even when partially deployed.SOLUTION: A solar panel sunshade according to the present invention includes a sheet-like screen, solar cells provided on the screen, and a winding device for the screen. The solar cells are connected in series to form a solar cell module, the solar cell modules are arranged side by side in the pull-out direction and connected in parallel, and at least one of the lock positions that maintains the screen in a pulled-out state is located between adjacent solar cell modules, such that a high output voltage that can charge the vehicle drive battery can be obtained even when the screen is partially deployed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a sunshade with a solar cell, and more particularly to a sunshade with a solar cell that can also charge a vehicle drive battery.

Background Art

[0002] There is known a device in which a solar cell is provided on a screen of a roll screen device used at the edge of a wall or a window to perform both light shielding and power generation.

[0003] For example, Patent Document 1 describes a roll screen device including a sheet-like screen portion and a winding mechanism for winding up the screen portion, and a solar cell is provided on the screen portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the roll screen device of Patent Document 1, since a plurality of solar cells arranged side by side in the vertical direction are not modularized, when a plurality of solar cells are connected in parallel, the output voltage cannot be increased, and when connected in series, when the screen is partially deployed, the solar cells in the undeployed portion become resistors and the overall output voltage decreases, making it difficult to charge a vehicle drive battery.

[0006] The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a sunshade with a solar cell that can obtain a high output voltage capable of charging a vehicle drive battery even during partial deployment.

Means for Solving the Problems

[0007] As a result of intensive studies to achieve the above object, the inventor of the present invention has found that the above object can be achieved by arranging solar cell modules in which a plurality of solar cells are connected in series in the drawing-out direction and connecting them in parallel so that the lock position of the screen comes between the solar cell modules, and has completed the present invention.

[0008] That is, the sunshade with a solar cell of the present invention includes a sheet-shaped screen, a solar cell provided on the screen, and a winding device for the screen. The solar cells are connected in series to form a solar cell module, the solar cell modules are arranged side by side in the drawing-out direction and are connected in parallel, and at least one lock position for maintaining the screen in the drawn-out state is located between adjacent solar cell modules.

Effect of the Invention

[0009] According to the present invention, since solar cell modules in which a plurality of solar cells are connected in series are arranged side by side in the drawing-out direction and connected in parallel so that the lock position of the screen comes between adjacent solar cell modules, it is possible to provide a sunshade with a solar cell that can obtain a high output voltage capable of charging a vehicle drive battery even during partial deployment.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0011] The sunshade with a solar cell of the present invention will be described in detail. The sunshade with a solar cell of the present invention (hereinafter simply referred to as "sunshade") includes a sheet-like screen and a winding device for winding the screen, and has a locking mechanism for maintaining the state where the screen is pulled out.

[0012] As shown in FIG. 1, rectangular flexible solar cells (hereinafter simply referred to as "solar cells") are arranged in a row on the screen such that their longitudinal direction is the width direction of the screen. When the screen is deployed, it blocks the sunlight incident inside the vehicle and generates electricity to charge the drive battery.

[0013] A plurality of the above solar cells are grouped together to form a solar cell module. Since this solar cell module is composed of solar cells connected in series, the output voltage is high, and an output voltage capable of charging the vehicle drive battery can be obtained.

[0014] Also, as shown in FIG. 2, the sunshade of the present invention has a plurality of the above solar cell modules, which are connected in parallel. Therefore, even if there are solar cell modules that do not contribute to power generation because they are not exposed to sunlight during partial deployment, etc., they do not affect the output voltage of other solar cell modules that are generating electricity in the deployed part. Thus, a high output voltage can be maintained even during partial deployment.

[0015] Furthermore, the plurality of solar cell modules are arranged side by side in the pulling-out direction, and the locking position for maintaining the state where the screen is pulled out, that is, the boundary between the area where the screen is pulled out and can receive sunlight and the area where it is wound around the winding device and cannot receive sunlight, is located between adjacent solar cell modules.

[0016] Therefore, it is prevented that one solar cell module is divided into a deployed part and an undeployed part, and the output voltage of the solar cell module does not decrease due to the series-connected solar cells in the undeployed part. Thus, the solar radiation incident on the deployed part of the solar cell module can be effectively utilized, and the power generation efficiency with respect to the deployment amount can be improved.

[0017] When there are a plurality of the above lock positions, at least one lock position may be located between adjacent solar cell modules. However, if all the lock positions are located between adjacent solar cell modules, a solar cell module in which a part is undeployed and the output decreases does not occur, so that the power generation efficiency can be improved.

[0018] The sunshade of the present invention can be provided with a charge-discharge control device that charges the generated power into a battery. The control method of the charge-discharge control device is preferably an MPPT (Maximum Power Point Tracking) method that follows the optimal current × voltage value (maximum power point) at which each solar cell module can maximize the output power generated.

[0019] When performing charge-discharge control on the plurality of solar cell modules collectively by the above MPPT method, it is preferable that the plurality of solar cell modules have the same number of solar cells constituting each solar cell module.

[0020] As a result, the output voltages at the maximum power points become the same among the plurality of solar cell modules receiving solar radiation, so that the power generation efficiency of the entire sunshade can be improved.

[0021] That is, since the solar cell module is composed of serially connected solar cells, for example, as shown in FIG. 3 above, if the number of solar cells constituting the solar cell module is different, the maximum output voltage of the solar cell module will be different between the solar cell modules.

[0022] When controlling the output voltage to match the maximum power point of a solar cell module with a small number of solar cells, as shown in the lower left of FIG. 3, the output of a number of solar cells exceeding the number of solar cells in the solar cell module with a small number of solar cells in a solar cell module with a large number of solar cells is wasted, resulting in a decrease in power generation efficiency.

[0023] Conversely, when controlling the output voltage to match the maximum power point of a solar cell module with a large number of solar cells, as shown in the lower right of FIG. 3, a solar cell module with a small number of solar cells cannot reach the above output voltage and cannot generate electricity.

[0024] By having the same number of solar cells in the solar cell modules, all solar cell modules can be operated at the maximum power point, improving the power generation efficiency.

[0025] The lengths of the plurality of solar cell modules in the drawing-out direction may all be the same or different. However, when the lengths in the drawing-out direction are different, as shown in FIG. 4, it is preferable that the solar cell module on the front side in the drawing-out direction is longer than the solar cell module on the rear side.

[0026] When the lengths of the solar cell modules in the drawing-out direction are the same, the lengths of the solar cells in the short side direction are the same, reducing the manufacturing cost.

[0027] Also, increasing the length of the solar cell module on the front side in the drawing-out direction increases the deployment area of the screen at the first locking position, so the output power during partial deployment can be increased.

[0028] As the winding device, a conventionally known winding device can be used. Specifically, one having a rotating shaft and a winding drum rotating around the rotating shaft, and fixing the rear end in the drawing-out direction of the screen to the winding drum can be used. Further, if necessary, a pair of guide rails for guiding the sliding of the screen may be provided at both ends in the width direction of the screen.

[0029] The drawing out and winding up of the above screen can be performed either electrically or manually. A motor may be provided on the rotating shaft of the winding drum. Alternatively, the rotating shaft of the winding drum may be biased in the direction of winding up the screen by a spring or the like, and the screen may be drawn out manually.

[0030] When the drawing out and winding up of the screen are performed electrically, the motor provided on the rotating shaft can be stopped and locked to maintain the drawn out state.

[0031] When the drawing out and winding up of the screen are performed manually, a cam having a step is provided on the rotating shaft, and the rotation of the rotating shaft biased such that a claw catches on this step is stopped and locked to maintain the drawn out state.

[0032] Furthermore, hooks may be provided on a pair of guide rails for guiding the sliding of the screen, the bottom bar at the tip of the screen may be hooked thereon, and the rotation of the biased rotating shaft may be stopped and locked to maintain the drawn out state.

[0033] The sunshade with a solar cell of the present invention can be preferably used as a sunshade mounted under the sunroof of a vehicle to block sunlight incident from the sunroof into the vehicle interior.

Description of Reference Numerals

[0034] 1 Solar cell module 11 Solar cell 2 Screen 21 Bottom bar 3 Winding device

Claims

1. A sheet-like screen, a solar cell provided on the screen, and a winding device for the screen, a sunshade with a solar cell, characterized in that the solar cells are connected in series to form a solar cell module, the solar cell modules are arranged side by side in the winding direction and are connected in parallel, at least one of the lock positions for maintaining the screen in the pulled-out state is located between adjacent solar cell modules.

2. The sunshade with a solar cell according to claim 1, characterized in that the number of solar cells constituting each solar cell module is the same.

3. The sunshade with a solar cell according to claim 2, characterized in that all of the lock positions are located between adjacent solar cell modules.

4. The sunshade with a solar cell according to claim 2 or 3, characterized in that the length of the solar cell module in the winding direction is such that the solar cell module on the front side in the pulling-out direction is longer than the solar cell module on the rear side.

5. The sunshade with a solar cell according to claim 2 or 3, characterized in that the lengths of the plurality of solar cell modules in the winding direction are all the same.

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