CN108667117A - A shared charging treasure device based on photovoltaic power generation at bus stops - Google Patents

Abstract

The present invention relates to a kind of shared charger baby device based on bus platform photovoltaic generation, which is characterized in that including：Photovoltaic battery panel；Echelon utilizes lithium battery group；According to photovoltaic battery panel, echelon electric energy is provided for shared charger baby case and platform load using the sequencing of lithium battery group, road lamp power supply；It is arranged in the shared charger baby case of bus platform, has multiple charger babies and charging wire in shared charger baby case；Intelligent monitor system.The present invention, using lithium battery energy storage battery, using bus platform as shared charger baby by means of also place, is facilitated borrowing for shared charger baby and gone back, embody energy-saving and emission-reduction, the environmental protection concept that green is shared using the power generation of photovoltaic photovoltaic battery panel, echelon.

Description

A shared charging treasure device based on photovoltaic power generation at bus stops

technical field

The invention relates to a device that combines photovoltaic power generation with a shared power bank and is applied to a bus stop.

Background technique

At present, shared charging treasure is the most fashionable sharing economy nowadays. Traditional places for shared power banks are generally in stations, coffee shops, and large shopping malls. Relatively fixed places make it inconvenient to borrow and return shared power banks, which greatly hinders the promotion of shared power banks. With the development of the urban public transportation system, bus stops have spread all over the city. Nowadays, the awnings of bus stops are basically idle resources and have not been effectively utilized. With the gradual industrialization of electric vehicles, according to the forecast of the authoritative department: by 2020, the annual decommissioned lithium batteries will grow explosively. The recycling and treatment of waste power lithium batteries have attracted people's close attention. The cascade utilization technology of decommissioned batteries is becoming more and more mature. Therefore, the use of a large number of cascaded lithium batteries is a problem that people need to consider urgently.

There are several types of shared power banks: one is mobile sharing in mobile mode, that is, both people and charging equipment can be moved, and users can borrow power banks from A to B; the other is fixed scenarios. Mobile sharing, that is, borrowing from point A and repaying at point A; the third is fixed sharing in a fixed scene, that is, the integration of line and machine. Their commonality is that the location is relatively fixed, and it is not convenient for people to borrow and return, which seriously hinders the promotion of shared charging treasures.

Contents of the invention

The purpose of the present invention is to provide a shared power bank device based on photovoltaic power generation at bus stops to solve the problem that the canopy at bus stops is basically an idle resource that has not been effectively utilized, and waste power lithium batteries are recycled and processed. , Most of the current shared charging treasure devices are placed in some relatively fixed places, resulting in problems such as not being convenient enough to borrow and return. In order to solve the above problems, the technical scheme that the present invention takes is as follows:

In order to achieve the above purpose, the technical solution of the present invention is to provide a shared charging treasure device based on photovoltaic power generation at bus stops, which is characterized in that it includes:

Photovoltaic panels are used to convert solar energy into direct current, and the direct current is sent to the DC bus after being converted by a unidirectional DC/DC converter;

The lithium battery pack is used in stages, and the lithium battery retired from the electric vehicle is used, which is connected to the DC bus through a bidirectional DC/DC converter. If the energy sent by the photovoltaic panel to the DC bus is excess, the excess energy will be converted through a bidirectional DC/DC converter. After the voltage is sent to the cascade utilization lithium battery pack for storage, if the energy provided by the photovoltaic panel is insufficient, the cascade utilization of the electric energy stored in the lithium battery pack is sent to the DC bus after the voltage is converted by the bidirectional DC/DC converter. After the electric energy stored in the battery pack is lower than the threshold A, the AC power is converted into DC power through the AC/DC converter, and then sent to the cascade utilization lithium battery pack through the DC bus and bidirectional DC/DC converter to provide the cascade utilization lithium battery pack. The battery pack is charged until the electric energy stored in the lithium battery pack is higher than the threshold B;

Photovoltaic panels or cascades use lithium battery packs to provide working voltage for the electrical equipment connected to the bus station of the DC bus;

The shared charging treasure box arranged on the bus station has multiple charging treasures in the shared charging treasure box, among which: the charging treasure and the shared charging treasure box adopt the combination of absorbing and charging, and the charging treasure is inserted into the hole on the shared charging treasure box and connected to the DC The busbar is connected, and the power bank is charged by the photovoltaic panel or the lithium battery pack in steps;

The intelligent monitoring system is used to monitor the output power of photovoltaic panels, the stored power in lithium battery packs in cascade utilization, the power consumption of electric equipment at bus stops, and the status of charging treasures in shared charging treasure boxes and mobile devices connected to charging cables. Power consumption, and according to the monitored data, control the photovoltaic panel to provide working voltage for the DC bus, or control the cascade use of lithium battery packs to provide working voltage for the DC bus, or control the photovoltaic panel to charge the cascade use of lithium battery packs, Or control the mains to charge the lithium battery pack for cascade use, so as to ensure the stable operation of the entire system.

Preferably, the shared charging treasure box is provided with a two-dimensional code containing the loan payment information of the charging treasure, and the shared charging treasure box also leads to a free charging data line, which is connected to the DC bus, and is powered by a photovoltaic panel or Ladder utilizes lithium battery packs to charge mobile devices connected to a charging cable.

Preferably, the bus stop is equipped with a rain shelter supported by support rods, the photovoltaic cell board is a polysilicon photovoltaic panel, and two polysilicon photovoltaic panels and the rain shelter are placed in an inverted triangular prism.

Preferably, the cascaded lithium battery pack is connected with loads such as the shared charging treasure box, street light power supply and photovoltaic panels through the support rod through dark lines.

Preferably, according to the difference in the location planning of each bus stop, the cascade utilization lithium battery is built on the left or right side of the platform, and adopts a waterproof and closed cabinet design, which should meet the safe and normal operation requirements of the cascade utilization lithium battery pack.

Preferably, the monitoring system is integrated inside the shared charging treasure box.

Preferably, the step is made using a lithium battery pack using the following steps:

Step 1. Recycling the decommissioned power lithium batteries of electric vehicles;

Step 2. Non-destructive dismantling of the decommissioned power lithium battery for subsequent testing;

Step 3. Detection and screening: According to the external characteristic parameters of the decommissioned power lithium battery, the performance of the lithium battery is detected and screened;

Step 4. Grouping: According to the performance test results of lithium battery cells, multiple lithium battery cells are paired and reassembled to form a battery pack;

Step 5, system integration: carry out the integration of step-by-step lithium battery packs.

Preferably, the shared charging treasure device for photovoltaic power generation at the bus station, the design of the platform part includes photovoltaic panels, cascaded lithium battery packs, shared charging treasure boxes, data lines, two-dimensional codes, electronic stop signs, electronic billboards, benches, The rain shelter, platform street lamp, support pole, and charging treasure are characterized in that: the underside of the rain shelter is provided with an electronic billboard and an electronic station board, and the lower side of the electronic billboard and the electronic station board is provided with a fixed bench, and There is a shared charging treasure box in the middle of the electronic billboard and the electronic station sign; the inside of the shared charging treasure box is equipped with a charging treasure, and a free charging data line is drawn out from the outside, and a two-dimensional code sign is pasted on the shared charging treasure box; The canopy and the two photovoltaic panels above it are placed in the shape of an inverted triangular prism; under the canopy, there are platform street lights for the night lighting of the bus platform; The location plan is built on the left or right of the platform. The technical characteristics of the present invention are:

1) According to the sequence of photovoltaic power generation, energy storage batteries, and street light power supplies, power is provided for the load, saving energy and reducing emissions while taking into account the reliability of the system's power supply;

2) The cascade utilization of decommissioned lithium batteries of electric vehicles provides energy storage batteries. Resource reuse saves costs and promotes the market promotion of electric vehicles;

3) Adopt intelligent monitoring system to realize the stable operation of the whole system;

4) Take advantage of the characteristics of large traffic and wide distribution of bus stops to facilitate the borrowing and returning of shared charging treasures;

5) Implement the convenience service of free charging for passengers at bus stops;

6) The lithium battery pack is used by the ladder to power the electronic stop sign, and to provide street lighting for the bus stop at night.

The invention adopts the order of photovoltaic power generation, cascade utilization of lithium battery energy storage, and street lamp power supply to provide electric energy for shared charging treasure boxes and platform loads, which embodies the environmental protection concept of energy saving, emission reduction, and green sharing. Using electric vehicles to use decommissioned lithium battery packs in stages as the energy storage batteries of the system saves costs and reuses resources, which is conducive to the market promotion of electric vehicles. The use of automated intelligent monitoring system embodies the modern concept of "artificial intelligence", which provides convenience for the later maintenance of the product and the feasibility of enhancing the system. The core advantage of the present invention is: using the bus station with large flow of people as the place, using new energy photovoltaic power generation as the main power supply and combining the step-by-step utilization technology of the decommissioned lithium battery of electric vehicles, it greatly provides convenience for people to use the shared power bank, and provides Under the trend of sharing charging economy, the promotion of sharing charging treasure plays a positive catalytic role.

Description of drawings

Fig. 1 is a system block diagram of the present invention;

Fig. 2 is a system logic diagram of the present invention;

Figure 3 is a logic block diagram of control theory;

Fig. 4 is the appearance schematic diagram (front view) of the present invention;

Fig. 5 is a schematic view of the appearance of the present invention (side view).

Detailed ways

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

The system structure of a shared charging treasure device based on photovoltaic power generation at bus stops provided by the present invention is shown in Figure 1, and is mainly composed of four parts: photovoltaic panels, cascaded lithium battery packs, shared charging treasure boxes and monitoring systems. Multiple sets of DC/DC converters are used in the conversion process of photovoltaic cell arrays, shared charging boxes and energy storage systems. According to the power transmission demand in the station, the AC/DC converter converts the alternating current from the mains to direct current to be connected to the charging system, and the monitoring system monitors and controls the energy transmission, thereby coordinating the operation of the charging station.

1) Photovoltaic panels: convert solar energy into direct current, and connect it to the DC bus of the system through a unidirectional DC/DC converter.

The essence of the photovoltaic cell panel is a large PN junction. When the photovoltaic cell panel is irradiated by sunlight, photons with a certain intensity are absorbed in the interface layer. These photons can excite the electrons in the covalent bond in the P and N regions. out to form electron-hole pairs. During the process of recombination of holes and electrons near the interface layer, they are separated from each other due to the electric field generated by the space charge. Electrons move to the N region while holes move to the P region. In this process, the current from the N-type region to the P-type region is formed, and then a potential difference is formed in the PN junction, which forms a photovoltaic power source.

There are mainly three types of photovoltaic panels on the market: monocrystalline silicon, polycrystalline silicon and semi-flexible polycrystalline silicon, and the efficiency of energy utilization increases in turn. Polycrystalline silicon is more cost-effective than monocrystalline silicon, and with the development of current technology, the cost of polycrystalline silicon has reached a price that can be fully utilized, and polycrystalline silicon photovoltaic panels are the best solution. For the bus stop platform of the present invention, the area of all of its usual rain shelters is about 6-10 square meters, adopting photovoltaic cell panels and rain shelters to be placed in the mode of side inverted triangular prisms (the number of each photovoltaic cell panel and roof The included angle is the same, about 10-25 degrees), and the total area of photovoltaic panels is about 8-12 square meters. The power of photovoltaic panels is about 150W per square meter, and the total power is about 1500W. The present invention arranges two photovoltaic cell panels to ensure that part of the system can still continue to perform photovoltaic power generation when one of them fails.

2) Cascade utilization of lithium battery packs: it plays a role in energy regulation in the system. When the photovoltaic power generation is excessive, the lithium battery pack is used in stages to store the excess electric energy; when the photovoltaic power generation is insufficient, it is discharged to the system, and the photovoltaic power generation and the street lamp power supply jointly provide charging power.

The cascade utilization of decommissioned lithium-ion batteries for vehicles is an effective means to reduce the life cycle cost of power batteries and improve the utilization value of batteries. From the perspective of effective resource utilization, environmental protection and cost saving, it is proposed to use decommissioned lithium batteries of electric vehicles as energy storage batteries. The step-by-step utilization steps are as follows:

① Recycling decommissioned power lithium batteries;

②Non-destructive disassembly of the battery system for subsequent testing;

③ Detection and screening: According to the external characteristic parameters of the battery, such as battery capacity and internal resistance characteristic test, OCV-SOC curve analysis, etc., the performance of the battery is detected and screened;

④ Grouping: According to the performance test results of the battery cells, the battery cells are paired and reassembled to form a battery pack.

⑤ System integration: Finally, carry out the integration of the step-by-step lithium battery pack.

In the screening process, the energy utilization rate and capacity of lithium batteries are used as the main performance evaluation indicators, and the consistency of lithium battery capacity is required to be high, so lithium batteries with good capacity consistency should be selected first. Selecting lithium batteries with the same capacity after fading to form a group will inevitably bring about a large initial difference in the internal resistance of lithium batteries, coupled with the inconsistency of self-discharge rate and polarization of lithium batteries, as the cascade utilization of lithium batteries continues The inconsistency problem of cascade utilization of lithium battery packs will become increasingly prominent, and the energy utilization rate and capacity of cascade utilization lithium battery packs will also decline significantly. Therefore, the consistency analysis and evaluation of lithium battery packs should also be carried out. Taking the maximum available capacity of the lithium battery pack as the basis for judging the consistency of the lithium battery pack can realize the decoupling between the consistency problem of the lithium battery pack and the operating conditions and environment of the cascaded utilization of the lithium battery pack, thus effectively avoiding the use of batteries outside the lithium battery pack. The problem of getting inaccurate conclusions by judging the consistency of lithium battery packs in cascades using voltage differences.

The charge and discharge capacity of a lithium battery is related to the magnitude of the charge and discharge current. In order to study the influence of the charge and discharge rate on the capacity of a lithium battery. When both the new lithium battery and the old lithium battery are charged at a certain rate of the rated capacity, the percentage of the charged capacity of the old lithium battery in the constant current stage is much lower than that of the new lithium battery; when both are charged at a certain rate of the available capacity, The charge capacity percentage of the old lithium battery in the constant current stage is close to that of the new lithium battery. When the old lithium battery is charged and discharged at a high rate, the polarization is more serious than that of the new lithium battery, and the available capacity is significantly reduced. Therefore, the cascaded lithium battery pack is suitable for putting into the energy storage condition of the small rate charge and discharge. A shared charging treasure device based on photovoltaic power generation at bus stops. This system just meets the working conditions of small rate charging and discharging.

3) DC/DC module: Photovoltaic panels and shared charging treasure boxes adopt unidirectional DC/DC modules, and the input and output related to lithium battery packs used in cascade use adopt bidirectional DC/DC modules.

4) AC/DC module: As a connecting component between the street lamp power supply and the charging system, it converts alternating current into direct current and then connects it to the system.

5) The shared charging box part includes a monitoring system, and the monitoring system is integrated inside the shared charging box. The charging treasure and the shared charging treasure box adopt the combination of absorbing and charging. People can choose to borrow the fully charged charging treasure when using it, and insert the charging treasure into the hole on the shared charging treasure box when returning it. The monitoring system detects that the charging treasure needs to be charged. charging is completed automatically. There is a QR code pasted on the shared charging treasure box, and people can borrow and return the charging treasure under the premise of paying a deposit by scanning the QR code. The shared charging treasure box also leads to a limited number of free charging data lines, and people can charge their mobile phones for free while waiting for the bus on the platform, bringing people a convenient service of free charging.

The monitoring system part uses a microcontroller (with a single-chip microcomputer or ARM processor as the core), including CPU, memory and registers. The monitoring system mainly monitors the power condition of the lithium battery pack used in the cascade. According to the battery power condition, the electric energy exchange between photovoltaic, street light power supply and cascade utilization lithium battery pack is realized by controlling the charging and discharging of the battery. The stable operation of the entire system is controlled by collecting and monitoring the parameters of the operating state of the entire system.

The monitoring system can monitor the power supply status of the charging treasure box, photovoltaic power generation status, and cascaded lithium battery pack power status in real time, and feed back to the remote monitoring center. Once a platform fails, an alarm will be issued immediately to facilitate the management and maintenance of the shared charging treasure device. At the same time, the operating data of the system is collected, such as the daily photovoltaic power generation, power consumption, battery terminal voltage value, and the borrowing and returning frequency of charging treasures, etc., and these data are stored and sent to the terminal. Through data analysis, the system can be effectively monitored. Healthy, convenient to improve and perfect the existing system.

The energy exchange strategy of the present invention is: always use the lithium battery pack to provide power for the shared charging treasure box and platform loads (such as electronic station signs, electronic billboards, and platform street lights, etc.), and monitor the power of the lithium battery pack in real time through the monitoring system. The situation realizes the electric energy exchange between photovoltaic, street light power supply and cascade utilization lithium battery pack. Its logic diagram is shown in Figure 2.

When the photovoltaic panel is not generating power (at night), the step-by-step lithium battery pack is used to supply power to the platform load. If the step-up lithium battery pack is less than 30% of its capacity, the street lamp power supply is used to charge the step-up lithium battery pack. End charging at 80% capacity. When the photovoltaic panel is generating electricity normally, the photovoltaic power supply is used to charge the cascaded lithium battery pack; if the photovoltaic power supply is not enough to supply the cascaded lithium battery pack with sufficient power and the power of the cascaded lithium battery pack is lower than 30% of the capacity, Start the street lamp power supply to charge the lithium battery pack for cascade utilization. In addition to powering the shared power bank system, the cascaded lithium battery pack also supplies power to other loads on the bus platform, such as bus electronic stop signs, bus electronic billboards, and platform street lights.

The theoretical logic block diagram of the charge and discharge control of the lithium battery pack is shown in Figure 3. The core of the control circuit adopts a microprocessor with a single-chip microcomputer or ARM processor as the core, controls the entire charging and discharging process by collecting and monitoring the operating status of the entire system, and controls DC/DC and AC/ The switch of the DC converter controls the charging and discharging process of the cascaded lithium battery pack. The use of PWM pulse modulation control protection technology can not only effectively protect the cascade utilization of lithium battery packs and prevent overcharging, but also quickly and smoothly charge the cascade utilization of lithium battery packs. The so-called PWM control is to control the duty cycle of the output waveform, the cycle does not change, and the charge and discharge are controlled by the conduction and closure of the switch tube.

Combining Figure 4 and Figure 5, a shared power bank device based on photovoltaic power generation at bus stops. The design of the platform includes: photovoltaic panels 1, step-by-step lithium battery packs 2, shared charging boxes 3, data lines 4, two-dimensional codes 5, Electronic station sign 6, electronic billboard 7, bench 8, rain shelter 9, platform street lamp 10, support pole 11, charging treasure 13, characterized in that: the lower side of the rain shelter 9 is provided with electronic billboard 7 and The electronic station sign 6, the electronic billboard 7 and the lower side of the electronic station sign 6 are provided with a fixed bench 8, and the middle of the electronic billboard 7 and the electronic station sign 6 is provided with a shared charging treasure box 3; the internal setting of the shared charging treasure box 3 There is a charging treasure 13, a free charging data line 4 is drawn from the outside, and a two-dimensional code 5 label is pasted on the shared charging treasure box 3; the canopy 9 and the two photovoltaic panels 1 above it form a side inverted triangular prism The shape is placed; there is a platform street lamp 10 for night lighting of the bus platform under the canopy 9; the ladder uses 2 groups of lithium battery packs to be built on the left or right of the platform according to the position planning of each bus platform.

A shared charging treasure device based on photovoltaic power generation at bus stops according to the present invention is mainly based on photovoltaic power generation and supplemented by street light power, which ensures the reliability of the system, energy saving and environmental protection. Provide energy storage batteries for the cascade utilization of decommissioned lithium batteries of electric vehicles, save costs by reusing resources, and promote the market promotion of electric vehicles. The monitoring system with single-chip microcomputer or ARM processor as the core ensures the stable operation of the whole system. Taking advantage of the characteristics of large traffic and wide distribution of bus stops facilitates the borrowing and returning of shared charging treasures, and at the same time makes full use of limited resources. The convenience service of charging passengers for free is proposed. Use photovoltaic power to power electronic stop signs and electronic billboards, and provide power for street lights at bus stops at night to save power.

Claims (7)

1. a kind of shared charger baby device based on bus platform photovoltaic generation, which is characterized in that including：

Photovoltaic battery panel, for converting solar energy into direct current, direct current is sent into after unidirectional DC/DC converters voltage of transformation DC bus；

Echelon utilizes lithium battery group, and using the retired lithium battery of electric vehicle, it is female to access direct current by two-way DC/DC converters Line, if photovoltaic battery panel is sent into the energy surplus of DC bus, extra energy passes through two-way DC/DC converters voltage of transformation It is sent into echelon afterwards using storage in lithium battery group, if the energy that photovoltaic battery panel provides is insufficient, echelon is using in lithium battery group The electric energy of storage is stored by being sent into DC bus after two-way DC/DC converters voltage of transformation when echelon utilizes in lithium battery group Electric energy less than after threshold value A, after convert alternating current is direct current by alternating current by AC/DC converters, then by DC bus and Two-way DC/DC converters are sent into echelon and utilize lithium battery group, are that echelon is charged using lithium battery group, until echelon utilizes lithium battery The electric energy stored in group is higher than threshold value B；

Photovoltaic battery panel or echelon provide work electricity using lithium battery group to access the electrical equipment of the bus platform of DC bus Pressure；

It is arranged in the shared charger baby case of bus platform, there are multiple charger babies in shared charger baby case, wherein：Charger baby is together It enjoys using the combination for receiving charging between charger baby case, charger baby is inserted into behind the hole shared on charger baby case and direct current mother Line is connected, and is charged for charger baby using lithium battery group by photovoltaic battery panel or echelon；

Intelligent monitor system, for monitoring the output electricity of photovoltaic battery panel, echelon utilizes storing electricity, the public affairs in lithium battery group It hands over the electricity consumption situation of the electrical equipment of platform, share the electricity consumption of charger baby and the mobile device being connected with charging wire in charger baby case Situation, and according to the data monitored, control provides operating voltage by photovoltaic battery panel for DC bus, or control echelon utilizes Lithium battery group provides operating voltage for DC bus, or control photovoltaic battery panel is that echelon is charged using lithium battery group, or is controlled Alternating current is that echelon is charged using lithium battery group, so that it is guaranteed that the stable operation of whole system.

2. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that The shared charger baby case is equipped with the Quick Response Code that payment information is borrowed comprising the charger baby, and shared charger baby case is also led to Free charging data line, charging data line are then connected with DC bus, are connected using lithium battery group by photovoltaic battery panel or echelon The charging of mobile devices being connected on charging data line.

3. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that institute It states bus platform and is disposed with rain shade by they sup-port, the photovoltaic battery panel uses polysilicon photovoltaic panel, two pieces of polycrystalline Silicon photovoltaic panel and rain shade fall the mode of tri-prismoid at side and place.

4. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that institute Echelon is stated using lithium battery group to be connected across supporting rod by concealed wire with load.

5. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that institute The difference of the position planning of each bus platform is stated, echelon build the left side or the right of the platform in using lithium battery group, using anti- The cabinet type design of water seal.

6. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that institute Monitoring system is stated to be integrated in inside shared charger baby case.

7. a kind of shared charger baby device based on bus platform photovoltaic generation as described in claim 1, which is characterized in that institute Echelon is stated to be made of following steps using lithium battery group：

Step 1, the retired dynamic lithium battery for recycling electric vehicle；

Step 2 carries out lossless dismantling to retired dynamic lithium battery, to carry out subsequent detection；

Step 3, detection screening：According to the external characteristics parameter of retired dynamic lithium battery, the performance of lithium battery is detected and is sieved Choosing；

Step 4, in groups：According to the performance test results of lithium battery monomer, multiple lithium battery monomers are subjected to pairing and reassemble into electricity Pond group；

Step 5, the system integration：Echelon is carried out using the integrated of lithium battery group.