KR101696750B1 - High-efficiency solar generation charging device - Google Patents

Abstract

The present invention relates to a charging apparatus for high-efficiency solar generation, and more particularly, to a charging apparatus for high-efficiency solar generation, which uses power bypassed among power generated from a solar cell due to the full charging state of a secondary battery as power required to maintain a temperature capable of increasing the efficiency of the secondary battery. The charging apparatus includes a solar cell, a secondary battery, a heater coil, and a control part.

Description

[0001] HIGH-EFFICIENCY SOLAR GENERATION CHARGING DEVICE [0002]

More particularly, the present invention relates to a charging apparatus for a high-efficiency solar cell, and more particularly, to a charging apparatus for a high-efficiency solar cell, which is capable of increasing the efficiency of a secondary battery by using power that is bypassed among power generated from a solar cell due to a full- And more particularly, to a high-efficiency charging apparatus for a solar power generator which is used as a power required to maintain a predetermined temperature.

Instead of fossil energy that emits greenhouse gases, research and development on clean energy has progressed, and solar power and wind power generation are emerging as future energy sources that can replace fossil energy.

Since conventional street lamps operate by receiving power from the outside without self-generating facilities, electric power is supplied from a power source of a long distance through a ground or ground power cable. Therefore, a long power cable is required, and a plurality of street lamps must be continuously connected by a power cable, thus requiring a considerable installation and management cost. In addition, there is a high probability that a safety accident will occur due to a short circuit such as a power cable in a flood due to heavy rain or the like.

Therefore, the solar street lamps which are provided with the solar power generation system for each streetlight to enable the nighttime lighting according to the self-generated power are gradually increasing. Such solar street lamps must be accompanied by a battery (secondary battery) for storing the solar irradiating daylight as electric energy.

Most lead-acid solar street lamps currently use lead acid batteries or Ni / Cd batteries. Lead-acid batteries have the advantages of large capacity, high safety and low cost, but they have a low energy density, so they take up a lot of installation space, shorten the operating time and life span, and require excessive maintenance costs. There is a problem that harmful pollutants are discharged. In the case of Ni / Cd batteries, as well as lead-acid batteries, there is a problem of discharging highly toxic pollutants such as cadmium (Cd), which occupy a large space due to low energy density.

Lead-acid batteries have been mainly used for batteries used in such solar power generation systems, and recently, they are being converted to lithium batteries (lithium ion, lithium polymer, etc.).

Normally, the battery voltage is low when the battery is not charged and the rated voltage is reached when the charge amount reaches the rated charge amount.

Therefore, when the charging terminal voltage reaches the set voltage (rated voltage) during charging, it is judged that the battery is fully charged and bypassed (the power generated by the solar cell) is no longer charged (preventing the battery life from shortening) )

However, at low temperature, the charge voltage is applied to the charger terminal (fake voltage, surface voltage), so that even when the battery is not fully charged, the battery is charged at the charge terminal of the battery, There are problems to be made.

Korean Patent No. 10-1035705 discloses a solar battery charge / discharge control device.

Korea registered patent [10-1035705] (Registration date: May 12, 2011)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method of controlling a secondary battery in which the temperature of a secondary battery is increased by using power that is bypassed among power generated from a solar cell due to a full state of the secondary battery, And more particularly, to a high-efficiency charging apparatus for a solar power generator used as a power required to maintain a temperature at which efficiency of a battery can be improved.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description .

According to an aspect of the present invention, there is provided a high efficiency solar cell charging apparatus including: a solar cell for solar power generation; A secondary battery 200 in which electric power generated from the solar cell 100 is charged and a casing 290 is formed in a double structure; A heater coil 300 for maintaining a temperature between the dual structure of the case 290 of the secondary battery 200; And controls the electrical connection so that the power generated from the solar cell 100 charges the secondary battery 200 when the secondary battery 200 is not overcharged, Controls the electrical connection so that power generated from the solar cell (100) is bypassed when the secondary battery (200) is in an overcharged state, and controls the electric power to be bypassed when the heater coil (300) And a controller 900 for controlling electrical connection to be used as a power source of the heater coil 300 and intermittently controlling the temperature of the secondary battery 200 and the margin of the discharge voltage of the secondary battery 200 in the night time zone .

The control unit 900 determines the state of charge (SOC) of the secondary battery 200 based on the terminal voltage and the temperature of the secondary battery 200 and controls the charge and discharge of the secondary battery 200 And a control unit.

The control unit 900 supplies power to the heater coil 300 when the temperature sensed by the secondary battery 200 is lower than a predetermined temperature.

The control unit 900 controls the power supply to the heater coil 300 to be cut off when the temperature of the secondary battery 200 senses the maximum temperature when the outside air temperature is lower than the set minimum temperature.

In addition, the high-efficiency solar power charging apparatus may further include a cooling unit 400 for reducing the temperature of the secondary battery 200. The control unit 900 controls the temperature of the secondary battery 200 And supplies power to the cooling unit 400 when the temperature exceeds the set temperature.

The control unit 900 controls the power supply to the cooling unit 400 to be cut off when the temperature sensed by the secondary battery 200 is lower than a set minimum temperature when the outside air temperature is higher than the set maximum temperature.

The cooling unit 400 is characterized by being composed of an air cooling type, a milk cooling type, a water cooling type, a gas cooling type, or an electronic cooling device.

The cooling unit 400 is configured by a cooling device using a thermoelectric element, wherein the heat absorption side is contacted to the outside of the secondary battery 200, and the heat generation side is exposed to the outside.

Further, the preset temperature is 13 ° C to 43 ° C.

The charging device for high-efficiency solar power may further include a thermal insulating material (500) for covering the case (290) of the secondary battery (200) so as not to be exposed to the outside.

Further, the heater coil 300 is coated with silicon having a self-heating effect.

Also, the insulating material 500 is a covered pad.

In addition, the heat insulating material 500 is heat-resistant to the heater coil 300, and the covering pad is formed of a flame-retardant material or a non-burnable material.

In addition, the thermal insulating material 500 is detachable by a zipper.

According to the charging apparatus for high-efficiency solar power generation according to an embodiment of the present invention, the temperature inside the secondary battery can be adjusted so as to increase the charging / discharging efficiency of the secondary battery, thereby improving the charging / discharging efficiency of the secondary battery .

Also, by sensing the temperature inside the secondary battery, determining the state of charge (SOC) of the secondary battery based on the sensed temperature, and controlling the charging / discharging of the secondary battery accordingly, So that it is possible to perform precise control.

When the temperature at which the secondary battery is sensed by the temperature sensor is lower than the set temperature, power is supplied to the heater coil to lower the temperature inside the secondary battery, thereby preventing the secondary battery from lowering in charge / discharge efficiency.

In addition, when the outside air temperature is lower than the set minimum temperature, the temperature at which the secondary battery is sensed is controlled so that the power supply to the heater coil is cut off at the set maximum temperature, so that the set temperature of the battery can be maintained for a longer time have.

When the temperature sensed inside the secondary battery is higher than the set temperature, power is supplied to the cooling unit to lower the temperature inside the secondary battery, so that the power generated from the solar cell is bypassed and consumed, The efficiency can be further increased.

In addition, when the outside air temperature is higher than the set maximum temperature, the power supply to the cooling unit is cut off at the temperature at which the secondary battery is sensed at the set minimum temperature, so that the set temperature of the battery can be maintained for a longer time have.

Further, by including the cooling unit constituted by the cooling device using the thermoelectric element, it is possible to minimize the volume and weight of the equipment required to maintain the temperature inside the secondary battery at the set temperature.

In addition, when the cell voltage is sensed to cause an unbalance in the cell voltage, the switch is controlled to be switched from the cell having the lowest voltage at the time of charging so as to increase the battery life of the secondary battery.

In addition, there is an effect that the power required for controlling the temperature inside the secondary battery can be reduced owing to the insulating material surrounding the case.

In addition, by using the heater coil coated with silicon having a self-warming effect, the power required for controlling the temperature inside the secondary battery can be reduced.

In addition, it can be detachable by zipper, which is made of coated pad, flame-retardant material or non-burnable material, and can wrap the pad. .

In addition, there is an effect of maximizing the amount of charge power by optimally maintaining the temperature of the battery in order to solve the problem that the secondary battery is misplaced and misplaced generation power is bypassed.

In addition, when the internal temperature of the secondary battery is low or high, surplus power bypassed from the solar cell is used, or the discharge voltage margin rate of the secondary battery is calculated and controlled in the night time zone to heat or cool the secondary battery, By maintaining the temperature at the optimum temperature for the charging and discharging efficiency of the secondary battery, the charging storage capacity and the discharging discharge amount of the secondary battery are increased by 95% or more, so that the utilization coefficient of the battery can be increased. It is possible to extend the life of the battery by extending the voltage, thereby minimizing the natural damage and greatly reducing the maintenance cost compared with the current technology.

1 is a conceptual diagram of a charging apparatus for high-efficiency solar power generation according to an embodiment of the present invention;
FIG. 2 is a graph showing the battery charge / discharge efficiency according to the conventional temperature. FIG.
FIG. 3 is a conceptual diagram in which a cooling unit is additionally provided in FIG. 1; FIG.
FIG. 4 is an exemplary diagram showing an example of the secondary battery internal circuit of FIG. 1; FIG.
Fig. 5 is an exemplary diagram showing another example of the secondary battery internal circuit of Fig. 1; Fig.
FIG. 6 is a conceptual diagram in which a thermal insulating material is additionally provided in FIG. 1;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, And does not preclude the presence or addition of one or more other features, integers, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor should properly interpret the concept of the term to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Further, it is to be understood that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible.

FIG. 1 is a conceptual diagram of a charging device for high-efficiency solar power generation according to an embodiment of the present invention, FIG. 2 is a graph showing charge / discharge efficiency of a battery according to a conventional temperature, FIG. 3 is a conceptual diagram FIG. 4 is an exemplary view showing an example of the secondary battery internal circuit of FIG. 1, FIG. 5 is an exemplary view showing another example of the secondary battery internal circuit of FIG. 1, and FIG. 6 is a cross- It is a conceptual diagram.

As shown in FIG. 1, the high efficiency solar power charging apparatus according to an embodiment of the present invention includes a solar cell 100, a secondary battery 200, a heater coil 300, and a control unit 900.

The solar cell 100 is used for solar power generation.

The solar cell 100 is also referred to as a "solar cell" or a "photovoltaic cell", and refers to a device capable of converting solar energy into electric energy.

 When the semiconductor junction region having the PN junction surface is irradiated with light having a larger energy than that of the forbidden band, electrons and holes are generated, and the internal electric field formed in the junction region moves the electrons to the N type semiconductor and the holes to the P type semiconductor, do. The electrodes to which the N-type semiconductor and the P-type semiconductor are respectively attached become the negative electrode and the positive electrode, so that the direct current can be taken. As a material of the solar cell semiconductor, not only silicon but also gallium arsenide, cadmium tellurium, cadmium sulfide, indium phosphorus, or a complex between these materials is used, but silicon is generally used.

The secondary battery 200 is charged with electric power generated from the solar cell 100, and a case 290, which is cashed in a dual structure, is formed.

The rechargeable battery 200 is a rechargeable battery that can be charged and discharged. The rechargeable battery 200 is charged with electricity from a solar cell (solar cell) during a week time zone in which sunlight or solar heat can be supplied, As a battery, the internal resistance is extremely low, and a large current can be output in a short time if necessary.

The secondary battery 200 is cashed in a case 290 of a double structure (a structure in which a space is formed so that the heater coil 300 can be installed therebetween) so as to mount the DC heater coil 300 .

The secondary battery 200 may be a lead acid battery, a seal lead battery, a nickel-cadmium battery, a nickel hydride battery, or a lithium battery (lithium ion, lithium polymer, etc.).

The secondary battery 200 can be divided into a bag-shaped pouch and a can-can. The pouch type is superior in price competitiveness and product application ability compared to the can type, and the can type is advantageous in the product completion and productivity. That is, since the case 290 can be manufactured as a can type and a pouch type, the double case 290 can be manufactured as a can type or a pouch type.

The heater coil 300 is interposed between the dual structures of the case 290 of the secondary battery 200 and is used for keeping warm.

The charging / discharging efficiency of the secondary battery 200 changes with temperature. In general, the efficiency is high at about 23 ° C. If the temperature is too low (0 ° C. or less) or too high (60 ° C. or more), the efficiency is lowered. Therefore, it is important that the temperature inside the secondary battery 200 is not lowered.

Therefore, it is preferable to provide the heater coil 300 so that the temperature inside the secondary battery 200 is not lowered.

That is, the heater coil 300 is a heating means for keeping the secondary battery 200 warm. When the internal temperature of the secondary battery 200 is low, the temperature of the secondary battery 200 can be maintained at a certain level The temperature of the secondary battery 200 is DC 1 to 5 A so that the temperature of the secondary battery 200 can be maintained.

In other words, when the internal temperature of the secondary battery 200 is low by the control of the controller 900, the surplus electric power of the solar cell 100 may be supplied to the heater coil 300 to be heated.

The control unit 900 determines the state of charge SOC so that the electric power generated from the solar cell 100 is electrically connected to charge the secondary battery 200 when the secondary battery 200 is not overcharged Controls the electrical connection so that the power generated from the solar cell 100 is bypassed when the secondary battery 200 is in an overcharged state and when the heater coil 300 requires power, The temperature of the secondary battery 200 and the margin of the discharge voltage of the secondary battery 200 are intermittently controlled in the night time zone.

When the heater coil 300 needs electric power to be surplus by-pass due to the overcharged state of the secondary battery 200 (the control unit 900) And controls the electrical connection so that the heater coil 300 can be supplied with power when the temperature drops below a predetermined temperature (e.g., 13 占 폚).

For example, when there is no power consumed at the lower end of the secondary battery 200 during the daytime and the secondary battery 200 is charged with electric energy generated in the solar cell 100, 900 controls the electrical connection.

Thereafter, when there is no power consumed at the bottom of the secondary battery 200 and the battery 900 is fully charged, the controller 900 controls the electric energy generated in the solar cell 100 to be supplied to the secondary battery 200 ) Controls the electrical connection. Here, full charge means a state in which charging is not required or the charging can no longer be performed (considering the efficiency of the battery or exceeding the preset charging amount).

At this time, when the temperature inside the secondary battery 200 drops below a proper temperature (for example, 13 ° C), the controller 900 controls the electrical connection so that the bypass coil can supply power to the heater coil 300.

In addition, the temperature inside the secondary battery 200 and the discharge voltage margin of the secondary battery 200 can be simultaneously controlled in the night time zone.

By connecting the power source to the heater coil 300 installed in the inner space of the case 290 having the double structure by heating the surplus electric power of the solar energy bypassed in the overcharged state in the winter time zone during the winter season, Even if the temperature is between -10 ° C and -15 ° C, the internal temperature of the battery can always be optimized (eg, 13 ° C to 43 ° C) to maintain the charge storage space and the discharge rate over 95%.

Also, even if the external temperature falls to -15 ° C to -25 ° C during the nighttime during the nighttime, the controller 900 calculates the margin of the battery discharge voltage and supplies power to the heater coil 300 The inside temperature of the secondary battery 200 is maintained to be optimized (for example, 13 ° C. to 43 ° C.) by heating the inside of the secondary battery 200. Therefore, the charge storage space and the discharge amount of the discharge are increased by 95% There is a feature that can increase.

At this time, the determination of the supply of power to the heater coil 300 (to make the supply of electricity more smooth) can be determined by analyzing the electricity usage pattern at the lower end.

The present invention is characterized in that when it is determined that the solar power generated from the solar cell 100 is fully charged in the secondary battery 200, the surplus power 40 continuously generated in the solar cell 10 is bypassed -pass).

The internal temperature of the secondary battery 200 is lower than the external temperature of the secondary battery 200 due to the characteristic of the battery temperature during winter (e.g., an external temperature: -0 ° C or less) in which the temperature drops sharply because the secondary battery 200 itself has insufficient heat- If the temperature drops significantly, the electrochemical reaction inside the battery may drop below 80% of the total charge. That is, since the charged amount of the battery is reduced, the battery is efficiently charged,

Accordingly, it is an object of the present invention to provide a device for increasing the temperature inside the secondary battery 200 by using surplus electric power generated from a solar cell in order to improve the problems of a battery charging apparatus using a conventional solar cell and to greatly improve utilization efficiency of four- And the like.

The control unit 900 determines the state of charge (SOC) of the secondary battery 200 based on the terminal voltage and the temperature of the secondary battery 200 and controls the charging / discharging of the secondary battery 200 accordingly . ≪ / RTI >

This is because the secondary battery 200 uses an electrochemical reaction, and the degree of the state of charge (SOC) can be changed according to the temperature, so that the state of charge (SOC) is determined and applied even if the temperature changes.

The control unit 900 may supply power to the heater coil 300 when the temperature sensed by the secondary battery 200 is lower than a predetermined temperature.

Normally, the battery voltage is low when the battery is not charged, and the rated voltage is reached when the charged amount reaches the rated charge amount. Accordingly, when the charging terminal voltage reaches a set voltage (rated voltage) at the time of charging, the battery is determined to be fully charged and bypassed (power generated in the solar cell 100) no longer charged.

However, at low temperatures, the charge voltage is applied to the charger terminal (fake voltage, surface voltage), so that even if the battery is not fully charged, as the battery is fully charged, In order to improve this, the battery temperature is optimized (eg, 13 ° C. to 43 ° C.) to maximize the charging power.

Therefore, when the temperature sensed inside the secondary battery 200 is sensed from the temperature sensor and the sensed temperature is lower than the set temperature, the controller 900 supplies power to the heater coil 300 to optimize the temperature (e.g., 13 < 0 > C to 43 < 0 > C) so as to maximize the charging power.

Here, the set temperature may be 13 ° C to 43 ° C.

In the management of the secondary battery, the most important thing is to maintain an appropriate operating temperature.

When the lead acid battery is used as a secondary battery, the lower the temperature of the battery, the less the diffusion of the electrolyte becomes, and the chemical reaction of the sulfur material between the anode and the anode is slowed, and the electric resistance of the electrolyte increases and the electromotive force decreases. And the gas generation rate is increased as well. The use rate of the cell is 30% at -20 ° C, 60% at -10 ° C, 85% at 0 ° C, 100% at 23 ° C and 90% at 60 ° C due to discharge characteristics (change in capacity) (See FIG. 2), it is found that there is a fatal decrease in efficiency and a decrease in lifetime in the sub-zero winter than in the normal temperature.

Especially, in case of the solar charging system security lamp using 100Ah battery, in the winter season, the battery internal temperature is maintained at -5 to -10 ° C in the daytime and -15 to -20 ° C in the nighttime at nighttime, When the capacity is actually operated at 30 Ah and the load for use is 40 W for 25 hours, it is confirmed that the battery is used for about 5 hours due to a reduction in battery efficiency and a reduction in battery storage space. In addition, the charging time should be charged 5.5 ~ 6 hours with the solar cell power generation device of 40V 5A after sunrise. Due to the temperature characteristic, And the diffusion of the electrolyte was difficult. As a result, the chemical reaction of the sulfur between the anode and the anode was observed to be slow. Also, during the summer and winter months, the charging time was three times or more, and the discharge amount was four times the difference.

In order to solve this problem, it is preferable to control the internal temperature of the battery at a setting temperature of 13 to 43 캜, which is a temperature at which the electrochemical reaction is smooth (charge / discharge efficiency of 95% or more).

For this purpose, it is preferable that the heater coil is formed of an electrical characteristic material having a DC rating of 1 to 5 A.

The present invention is not limited to the above embodiments and can be applied to a secondary battery such as a lead battery, a seal lead battery, a nickel-cadmium battery, a nickel hydride battery, or a lithium battery Lithium ion, lithium polymer, etc.) and the like), it is of course possible to set and use the set temperature.

Lithium hexafluorophosphate (LiPF6), which is often used as an electrolyte in lithium-ion batteries, reacts with water when the temperature rises. For this reason, the electrolyte is made of an organic solvent instead of water. Even if there is only a trace amount of water, the electrolyte reacts, and the ability to transfer lithium ions is lowered.

If the temperature is high, the properties of the cathode material and the anode material may be changed. The change in properties of the two materials greatly affects battery life. This is because the charge capacity is determined depending on how much lithium ions adhere to the cathode material or the anode material. If the properties of both materials change by heat, the capacity is permanently reduced.

On the other hand, when the temperature is low, the chemical reaction occurring in the battery occurs slowly. Also, the electrolyte has a high viscosity at a low temperature and does not perform the role of delivering lithium ions. This makes it difficult to transfer electricity to the device even when the battery is fully charged.

The control unit 900 controls the power supply to the heater coil 300 to be cut off when the temperature of the secondary battery 200 senses the maximum temperature when the outside air temperature is lower than the set minimum temperature have.

That is, when the outside air temperature is lower than the preset minimum temperature, such as winter, the controller 900 operates the heater coil 300 when the sensed temperature of the secondary battery 200 is lower than the set minimum temperature, The heater coil 300 is stopped.

This is to keep the set temperature of the battery for a longer time even if there is no surplus power by heating to the maximum set temperature in preparation for the battery temperature being lowered due to the ambient temperature.

Here, if the set temperature is set at 13 ° C to 43 ° C, the set minimum temperature becomes 13 ° C and the set maximum temperature becomes 43 ° C.

The generated electricity disappears when not in use. Therefore, if you do not use the electricity that is bypassed, you will waste energy. Therefore, it is preferable to use the electricity to be bypassed to increase the charging / discharging efficiency of the secondary battery 200.

3, the charging apparatus for high-efficiency solar power generation according to an exemplary embodiment of the present invention further includes a cooling unit 400 for reducing the temperature of the secondary battery 200, And supplies power to the cooling unit 400 when the temperature sensed by the temperature sensor exceeds the set temperature.

As described above, when the internal temperature of the secondary battery 200 is low, the charge / discharge efficiency of the secondary battery 200 is low as shown in FIG. 2, The temperature inside the secondary battery 200 is lowered by using the cooling unit 400 to increase the charge / discharge efficiency of the battery when the temperature inside the battery 200 is high.

For example, when the temperature inside the secondary battery 200 does not drop below an appropriate temperature (for example, 13 ° C. to 43 ° C.) under the condition that the electric energy generated in the solar cell 100 is bypassed, (For example, 23 占 폚) by using the cooling unit 400 if the temperature inside the cooling unit 200 gradually increases to exceed the proper temperature (for example, 13 占 폚 to 43 占 폚) It is also possible to cool it below.

That is, it is difficult to maximize the charge / discharge efficiency of the battery by heating only when the temperature inside the secondary battery 200 falls below a proper temperature. However, if it is possible to heat and cool the secondary battery 200, Can be controlled to be close to the optimum point temperature (for example, 23 DEG C), so that the charging / discharging efficiency of the secondary battery 200 can be further increased.

The control unit 900 controls the power supply to the cooling unit 400 to be cut off when the temperature sensed by the secondary battery 200 is the set minimum temperature when the outside air temperature is higher than the set maximum temperature have.

That is, when the outside air temperature is higher than the preset maximum temperature, such as summer, the controller 900 operates the cooling unit 400 when the sensed temperature of the secondary battery 200 is higher than the set maximum temperature, 200 is detected reaches the set minimum temperature, the cooling unit 400 is stopped.

This is to maintain the set temperature of the battery for a longer time even if there is no surplus power by cooling the battery up to the set temperature in preparation for the battery temperature rising due to the ambient temperature.

Here, if the set temperature is set at 13 ° C to 43 ° C, the set minimum temperature becomes 13 ° C and the set maximum temperature becomes 43 ° C.

At this time, the cooling unit 400 may be an air cooling type, a milk cooling type, a water cooling type, a gas cooling type, or an electronic cooling device.

In the case of the air cooling type cooling apparatus, a heat sink may be installed around the secondary battery 200 and the raised heat may be dissipated into the atmosphere. Further, in order to increase the cooling efficiency, air can be circulated to the heat radiating plate by the blower, thereby further increasing the cooling efficiency.

In the case of a water-cooled, water-cooled or gas-cooled cooling device, a cooling tube is installed around the secondary battery 200, and a pump (motor), a radiator, a fan (blower), a water temperature controller (thermostat) .

When warming the outside of the secondary battery 200, it is preferable to provide a cooling system of oil-cooling type, water-cooling type or gas cooling type rather than the air-cooling type cooling device.

Here, the cooling unit 400 may be a cooling device using a thermoelectric device, wherein the heat absorbing side is in contact with the outside of the secondary battery 200, and the heat generating side is exposed to the outside.

That is, the heat absorption side of the cooling unit 400 absorbs the heat of the secondary battery 200 to lower the temperature inside the secondary battery. At this time, it is preferable that the heat generation side of the cooling unit 400 does not affect the temperature of the secondary battery 200.

4, the secondary battery 200 includes a plurality of cells 210, and each of the cells 210 includes a switch 220 for controlling electrical connection with a terminal of the secondary battery 200, And a battery management system 230 for controlling switching of the switch 220 so as to charge the cell 210 having the lowest voltage at the time of charging when an inter-cell voltage imbalance occurs by sensing the voltage of each cell 210 have.

Each of the cells 210 may be configured to have a voltage of about 1.2 to 2.2 V and the structure of the cell 210 may include a separator, a terminal post, a cell cover, a support, And a cathode plate, a cathode plate, an electrolyte, or the like can be accommodated.

The voltage per each cell 210 of the secondary battery 200 is 1.2 to 2.2 V in a fully charged state but may be discharged at a slightly lower voltage (1.1 to 2.0 V) due to a voltage drop due to an internal resistance at the time of discharging have.

In the electrical connection of the secondary battery 200, a plurality of cells may be connected to the terminals (+ terminal, - terminal) of the secondary battery 200 in a series, parallel or series / parallel combination structure.

In FIG. 4, an example of connecting in series is shown.

4, the secondary battery 200 includes a plurality of cells 210 connected in series, a plurality of leads connected between the cells 210 and the cells 210, The switch 220 may be provided between the cell 210 and the cell 210 and between the terminal of the secondary cell 200 and the cell 210. [

This is to control the electrical connection so that the cell 210 to be charged can be selectively charged with the charging power supplied to the terminal of the secondary battery 200.

At this time, it is preferable that the charging power supplied to the terminal is supplied with the charging power capable of charging one cell, and the cell to be charged may be charged by being connected in parallel with the terminal.

That is, the battery management system 230 senses the voltage of each cell 210, and when the inter-cell voltage imbalance occurs, the switch 220 can be controlled so as to be charged from the cell 210 having the lowest voltage at the time of charging have.

In addition, when the secondary battery 200 supplies power to the load, the switch 220 can be controlled so as to be supplied with the discharge power.

At this time, the charging power (for example, 2 V) and the discharging power (for example, 12 V) may be different from each other. For example, the charging power can be switched so that cells requiring charging are connected in parallel, and the discharging power can be switched so that the cells supplying power to the load are connected in series.

In other words, the switch 220 switches the electrical connection between the cells 210 and the terminals of the secondary battery 200.

That is, the charging can be selectively performed by charging the cell, and the discharge can be discharged at a predetermined voltage.

In addition, the switch 220 may be configured such that some or all of the cells 100, which are discharged and not discharged, are charged.

5, the secondary battery 200 may further include a charging unit 240 and a discharging unit 250. Referring to FIG.

The charging unit 240 is provided between the charging terminal and the switch 220 so that the power supplied from the solar cell 100 can be supplied to the cells to be charged and charged.

The discharging unit 250 is provided between the discharging terminal and the switch 220, and can output a power required for supplying the discharging terminal to the external load.

The cells to be charged through the charging unit 240 can be selected by the battery management system 230 by switching and controlling the switches 220. The cells discharged through the discharging unit 250 are also connected to the battery management system 230, The switch 220 can be controlled by switching, and a cell used for charging and a cell used for discharging can be distinguished from each other to perform charging and discharging simultaneously.

6, the charging apparatus for high-efficiency solar power generation according to an embodiment of the present invention further includes a thermal insulating material 500 for covering the case 290 of the secondary battery 200 so that the case 290 is not exposed to the outside can do.

At this time, the insulating material 500 may be a covered pad.

At this time, when the cooling unit 400 configured by the cooling device using the thermoelectric element is used, the heat absorbing side of the thermoelectric element when the thermoelectric element is used is in contact with the outside of the secondary battery 200, (400) is installed through the heat insulating material (500).

This is to prevent the heat generation side of the cooling unit 400 from affecting the temperature of the secondary battery 200.

Further, in order to prevent a fire due to an explosion, the heat insulating material 500 has heat resistance to the heater coil 300, and the covering pad is formed of a flame retardant material or a non-combustible material .

Further, in order to facilitate detachment and attachment, the heat insulating material 500 can be detachably attached to a zipper, and a vinyl or artificial leather cover or the like can be used.

One of the insulation members 500 may be selectively used, but it is also possible to apply the insulation members 500 in a redundant manner.

For example, the heat insulating material 500 may maximize the thermal effect of the secondary battery 200 generated by the heater coil 300 that warms the secondary battery 200, (A cover type pad) that primarily surrounds the heater coil 300 is used, and is formed of a flame retardant material or a non-combustible material as a secondary material A heat insulating member having heat resistance can be used, and a vinyl or artificial leather cover that can be detachably attached by a zipper and shields wind from the outside can be used.

That is, power is supplied to the heater coil 300 to supply power to the heating unit or the cooling unit 400 to cool the unit, thereby adjusting the temperature inside the secondary battery 200, An additional insulating material 500 may be used to prevent (change) the temperature from being changed by the external temperature.

The heater coil 300 may be coated with silicon having a self-heating effect.

This is to reduce the electric power used for heating by raising the heating effect of the heater coil 300 itself.

That is, the heater coil 300 is coated with silicon having a self-heating effect, and the heater coil 300 is installed inside the case 290 having a double structure of the secondary battery 200, When a three-dimensionally insulated thermal insulating material 500 is used, a five-insulation effect can be obtained when a cover, a case, a covered pad, a heat insulating member having heat resistance, and a cover detachable by a zipper are used.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Solar cell 200: Secondary cell
210: cell 220: switch
230: Battery management system 240:
250: discharging part 290: case
300: heater coil 400: cooling part
500: Insulating material 900: Control unit

Claims (14)

A solar cell (100) for solar power generation;
A secondary battery 200 in which electric power generated from the solar cell 100 is charged and a casing 290 is formed in a double structure;
A heater coil 300 for maintaining a temperature between the dual structure of the case 290 of the secondary battery 200; And
And controls the electrical connection so that the electric power generated from the solar cell 100 charges the secondary battery 200 when the secondary battery 200 is not overcharged by determining the state of charge SOC, Controls the electrical connection so that power generated from the solar cell 100 is bypassed when the battery 200 is in an overcharged state and controls the electrical power to be bypassed when the heater coil 300 requires power, And a control unit 900 for controlling the electrical connection to be used as a power source of the coil 300 and intermittently controlling the temperature of the secondary battery 200 and the margin of the discharge voltage of the secondary battery 200 in the night time zone,
Wherein the heat insulating material (500) is a cover type pad, and further comprises a heat insulating material (500) for covering the case (290) of the secondary battery (200) so as not to be exposed to the outside.
The method according to claim 1,
The control unit 900
(SOC) of the secondary battery (200) based on the terminal voltage and the temperature of the secondary battery (200), and controls charging / discharging of the secondary battery (200) Charging device for power generation.
The method according to claim 1,
The control unit 900
And supplies power to the heater coil (300) when the temperature sensed by the secondary battery (200) is lower than the set temperature.
The method of claim 3,
The control unit 900
And controls the power supply to the heater coil (300) to be cut off when the temperature sensed by the secondary battery (200) is the set maximum temperature when the outside air temperature is lower than the set minimum temperature.
The method according to claim 1,
The high efficiency solar power charging apparatus
A cooling unit 400 for reducing the temperature of the secondary battery 200;
Further comprising:
The control unit 900
And supplies power to the cooling unit (400) when the temperature sensed by the secondary battery (200) exceeds a set temperature.
6. The method of claim 5,
The control unit 900
And controls the power supply to the cooling unit (400) to be cut off when the temperature sensed by the secondary battery (200) is the set minimum temperature when the outside air temperature is higher than the set maximum temperature.
6. The method of claim 5,
The cooling unit 400
Characterized in that it comprises an air cooling type, an oil cooling type, a water cooling type, a gas cooling type or an electronic cooling device.
6. The method of claim 5,
The cooling unit 400
And a cooling device using a thermoelectric element,
Wherein the heat absorption side is in contact with the outside of the secondary battery (200), and the heat generation side is exposed to the outside.
The method according to claim 3 or 5,
The set temperature
13 < 0 > C to 43 < 0 > C.
delete The method according to claim 1,
The heater coil 300
Characterized in that it is coated with silicon having a self-warming effect.
delete The method according to claim 1,
The coated pad
Wherein the heater coil has a heat resistance to the heater coil, and is formed of a flame retardant material or a non-combustible material.

The method according to claim 1,
The coated pad
Wherein the fastening means is detachable by a zipper.

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