Low-power-cost charging station system

Abstract

The invention relates to the technical field of new energy charging, in particular to a low-electricity-cost charging station system, which is characterized in that electric energy is stored through a cement battery technology in a low-electricity-price period of a power grid at night, and a cement battery is supplemented and charged by a photovoltaic panel and a wind power generation system configured in a charging station in the daytime; the cement battery can provide electric energy for a charging pile at low cost in the daytime and at night, the cement battery is prepared by mixing cement, carbon black and an auxiliary additive, a carbon network with electronic conductivity is formed through a hydration process, and the interior of the cement battery contains a pore structure and is used as a charge storage medium; a mixture with cement and carbon black as main components is used as an electrode material, and a KCl solution with a neutral pH value is selected as an electrolyte, so that the safety of the battery and the compatibility with a cement material are improved. By utilizing the low cost of the cement battery, photovoltaic power, wind power and low-electricity-price power in the early morning are charged into the cement battery module, so that the effects of low electricity price and quick charging are realized.

Description

Technical Field

[0001] The present invention relates to the field of new energy charging technology, and in particular to a low-electricity cost charging station system. Background Art

[0002] In the power system, the peak period during the day is the peak period of industrial and commercial electricity consumption. At this time, the power grid is under great pressure and the electricity cost is relatively high. Since charging piles mainly rely on power grids for power supply, the electricity price for charging during the day remains high. In this case, many new energy vehicle owners are unwilling to charge at high electricity prices during the day, resulting in a shortage of charging vehicles at charging piles during the day, while charging vehicles line up in long queues during the low electricity price period in the early morning.

[0003] To solve this problem, we urgently need an energy storage technology that can store electricity during the night when electricity prices are lower and release it during the daytime peak hours to meet the growing daytime charging demand. However, the current energy storage battery solutions, such as lead-acid batteries, lithium-ion batteries, sodium-ion batteries, lithium-sulfur batteries, etc., although the technology is mature, have high manufacturing costs, high safety risks and high environmental protection requirements, and require strict safety management measures and reporting procedures. Summary of the invention

[0004] The purpose of the present invention is to provide a low-electricity cost charging station system to address the deficiencies of the prior art. The low-electricity cost charging station system can well solve safety and environmental protection problems.

[0005] In order to achieve the above requirements, the technical solution adopted by the present invention to solve its technical problems is:

[0006] A low-electricity-cost charging station system is provided. The system utilizes the low-electricity-price period of the night power grid to store electric energy through cement battery technology. During the day, the photovoltaic panels and wind power generation systems configured in the charging station are used to supplement and charge the cement batteries. Electric energy can be provided to charging piles at low cost both during the day and at night. The cement battery is made of a mixture of cement, carbon black and auxiliary additives. A carbon network with electronic conductivity is formed through a hydration process. The carbon network contains a pore structure inside, which is used as a charge storage medium. A mixture with cement and carbon black as main components is used as an electrode material. A KCl solution with a neutral pH value is selected as the electrolyte, so as to improve the safety of the battery and the compatibility with the cement material.

[0007] Preferably, the cement battery adopts a standardized modular design and uses a diaphragm to isolate the positive and negative electrodes and the electrolyte to ensure safe and efficient operation between battery cells.

[0008] Preferably, the charging station system also includes a battery management system (BMS), which is used to monitor the voltage, current, capacity and temperature of the cement battery cells in real time, implement charge and discharge protection, ensure that the battery operates within a safe temperature range, and achieve balanced charge and discharge between battery cells.

[0009] The preferred solution of this invention is that the photovoltaic panels and wind power generation devices configured in the charging station cooperate with big data analysis to intelligently adjust the storage and distribution of electric energy according to weather and wind forecast results, so as to ensure that the cement battery packs are fully charged during the period of low electricity price.

[0010] Preferably, each of the charging piles is equipped with a small energy storage battery as a buffer to cope with the discharge jitter problem when the cement battery pack is quickly switched, thereby meeting the fast charging needs of new energy vehicles.

[0011] Preferably, the charging station system is combined with a microgrid distributed energy system to provide an integrated energy management and utilization solution for smart buildings and cities.

[0012] Preferably, the battery box of the cement battery adopts a stackable structure for installation and expansion, and a packaging material with mechanical protection and electrical insulation is arranged on the outside to ensure the long-term stable operation of the battery box in various outdoor environments.

[0013] The preferred solution of this invention is that the charging station system is integrated with the building for application, the cement battery is embedded in the building structure and connected to the photovoltaic panels and wind power generation equipment on the building surface, so as to realize a self-sufficient green energy system for the building.

[0014] The beneficial effects of the present invention are:

[0015] This low-electricity-cost charging station system utilizes the low cost of cement batteries to charge the electricity from photovoltaics, wind power, and low-early-morning electricity prices into cement battery modules, allowing the energy storage modules to meet the daytime charging needs of new energy vehicles, enjoying the same price as low-early-morning electricity prices, and also having the same fast charging capability.

[0016] Cement batteries are sustainable and environmentally friendly. They are made of environmentally friendly materials such as cement, water and carbon black. Compared with traditional lithium-ion batteries, their manufacturing process does not involve rare metals and toxic chemicals, so they have less impact on the environment. Moreover, cement batteries do not produce harmful electrolyte leakage during use, further reducing the impact on the environment.

[0017] The role of cement batteries in energy storage and balancing, with the rapid development of renewable energy, energy storage and balancing are becoming more and more important. As a new type of energy storage, cement batteries have high potential. It can store unstable renewable energy such as solar and wind energy, achieve energy balance and scheduling, and improve the stability and reliability of the power grid.

[0018] With the development of intelligent and distributed energy systems, new energy systems such as microgrids are gradually becoming mainstream. As a flexible and reliable energy storage method, cement batteries can be combined with distributed energy systems such as solar energy and wind energy to provide stable energy support for microgrids and improve the autonomy and controllability of energy systems.

[0019] Cement batteries can not only be used in traditional energy storage and supply systems, but can also be combined with architectural and urban design to achieve intelligent energy management and utilization. For example, cement batteries can be embedded in building structures, and solar photovoltaic panels and wind power generation systems on the surface of the building can be used to charge cement batteries, thus achieving a self-sufficient energy system for the building, while reducing dependence on external energy and improving the environmental protection and sustainability of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0021] Figure 1 The logical structure diagram of the low-electricity-cost charging station system of the present invention;

[0022] Figure 2 A structural diagram of a cement battery of a low-electricity-cost charging station system of the present invention;

[0023] Figure 3 It is a logic structure diagram of the circuit system of the low-electricity-cost charging station system of the present invention. DETAILED DESCRIPTION

[0024] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0025] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0027] Moreover, the terms "up, down, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or equipment described in this scheme during normal use.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0029] This embodiment discloses Figure 1 - Attachment Figure 3 A low-electricity cost charging station system is shown. It uses cement battery technology to store electric energy during the night when the power grid has low electricity prices. During the day, the photovoltaic panels and wind power generation systems configured in the charging station are used to supplement and charge the cement batteries. Electricity can be provided to the charging piles at low cost both during the day and at night. The cement battery is made of a mixture of cement, carbon black and auxiliary additives. A carbon network with electronic conductivity is formed through a hydration process. The carbon network contains a pore structure inside, which is used as a charge storage medium. A mixture with cement and carbon black as the main components is used as an electrode material. The electrolyte uses a KCl solution with a neutral pH value to improve the safety of the battery and its compatibility with cement materials.

[0030] In this embodiment, the cement battery adopts a standardized modular design and uses a diaphragm to isolate the positive and negative electrodes and the electrolyte to ensure safe and efficient operation between battery cells.

[0031] In this embodiment, the charging station system also includes a battery management system (BMS), which is used to monitor the voltage, current, capacity and temperature of the cement battery cells in real time, implement charge and discharge protection, ensure that the battery operates within a safe temperature range, and achieve balanced charge and discharge between battery cells.

[0032] In this embodiment, the photovoltaic panels and wind power generation devices configured in the charging station cooperate with big data analysis to intelligently adjust the storage and distribution of electrical energy based on weather and wind forecast results to ensure that the cement battery packs are fully energy stored during periods of low electricity prices.

[0033] In this embodiment, each of the charging piles is equipped with a small energy storage battery as a buffer to cope with the jitter problem during switching when the cement battery pack is rapidly discharged, thereby meeting the fast charging requirements of new energy vehicles.

[0034] In this embodiment, the charging station system is combined with a microgrid distributed energy system to provide an integrated energy management and utilization solution for smart buildings and cities.

[0035] In this embodiment, the battery box of the cement battery adopts a stackable structure for installation and expansion, and a packaging material with mechanical protection and electrical insulation is arranged on the outside to ensure the long-term stable operation of the battery box in various outdoor environments.

[0036] In this embodiment, the charging station system is integrated with the building for application, the cement battery is embedded in the building structure and connected to the photovoltaic panels and wind power generation equipment on the building surface, realizing a self-sufficient green energy system for the building.

[0037] In this embodiment, the main purpose is to realize cement energy storage batteries and low electricity price systems. Different proportions of carbon black are added to cement for dry mixing. Then, water and a high-efficiency water reducer (1-1) are mixed under continuous stirring to achieve a target water-cement ratio (W / C mass ratio 1-2). After cement hydration, a fractal-like electronic conductive carbon network is generated. The carbon black is fully and evenly distributed in the cement to form disordered microporous carbon black, which relies on high specific surface area electronic conductive materials to store charges. This means that the network structure formed on the electrode surface is used to transmit electrons, the pores are conducive to the storage of charges, and the surface layer carries an opposite charge to adsorb charges, which helps ions diffuse and transmit charges. Ions will enter and exit the surface layer through saturated electrolytes.

[0038] In this embodiment, the formation of reservoir pores: ① hydration reaction is the key to the generation of reservoir pores; ② the characteristic stoichiometry of the hydration reaction limits the maximum amount of water that can chemically combine into calcium hydroxide and calcium silicon hydrate and adsorb onto the surface of CSH nanoparticles (1-3); ③ water exceeding this stoichiometric water limit will lead to the formation of micron and submicron sized hydration pores; the above three points can be used as storage pores for saturated electrolytes, thereby creating a super container with high rate capability.

[0039] In this example, fresh cement-carbon paste was poured into a mold and soaked in lime water during hydration. After the sample hardened for at least 28 days, it was demoulded following conventional concrete engineering specifications. Afterwards, the sample was cut to a specified thickness using an electroplated diamond saw and the sample surface was polished using a sequence of silicon carbide sandpapers with decreasing abrasiveness. The sample acting as an electrode was also saturated in a 1M KCl (1-4) electrolyte. KCl (1-4) was selected as the electrolyte because its pH value is neutral, aiming to minimize the potential impact on the microstructure of the cement paste. Avoiding the use of acidic solutions and choosing KCl (1-4) makes the electrolyte suitable for its intended application while ensuring compatibility with the cement paste. In addition, KCl (1-4) has a relatively high diffusion coefficient. The threads formed by the aggregation of carbon black particles in the cement mixture are cut into sheets or blocks, and a membrane and an electrolyte made of simple salts such as sodium chloride are added between the electrodes, and the sandwich structure is sealed. The role of the electrolyte is to provide an ion conductive channel and act as a medium during the charging and discharging process; the above forms a container for a cement battery.

[0040] In this embodiment, the charging process of the monolithic cement battery container is as follows: ① Electrolyte ionization: During the charging process, the ions in the electrolyte are forced to move due to the action of the external power source. The ions released when the positive electrode is discharged will be forced to return to the negative electrode during the charging process, and the electrons released when the negative electrode is discharged will return to the positive electrode. ② Storing electrical energy: The electrolyte plays the role of storing the electrical energy provided by the external power source during the charging process. By converting the current provided by the external power source into chemical energy, the electrolyte helps the cement battery store the electrical energy for subsequent use.

[0041] In this embodiment, the discharge process of the monolithic cement battery container is as follows: ① Electrolyte conduction: During the discharge process, the electrolyte plays a conductive role, allowing the charge inside the battery to be transferred in the electrolyte. In this way, the electrons at the negative electrode flow from the negative electrode to the positive electrode, and the ions at the positive electrode flow to the negative electrode through the electrolyte, completing the battery discharge process; ② Release of stored electrical energy: During the discharge process, the electrolyte helps the cement battery convert the stored electrical energy into current, thereby providing power to the external circuit.

[0042] In this embodiment, based on the sheet or block cement battery formed above, we can build it into a standard cement battery box. In this box, the positive and negative electrodes of the cement battery and the electrolyte are separated by a diaphragm. Each cement battery cell is made of a mixture of carbon black and cement, and a plurality of sheet or block cement battery cells are contained in the battery box.

[0043] In order to ensure the efficient operation and safety of the battery, the cement battery box is equipped with a battery management system (BMS1-5). The functions of the system include: ① Monitoring and management: real-time monitoring of the status of each cement battery unit, including parameters such as voltage, current and capacity; ② Temperature monitoring: continuous monitoring of the temperature of the cement battery to ensure that it operates within a safe operating temperature range to avoid the impact of overheating or low temperature on battery performance; ③ Charge and discharge protection: provide overcharge and over-discharge protection to prevent the battery from overcharging or over-discharging, so as to extend battery life and improve safety; ④ Balanced charge and discharge: achieve balanced charge and discharge between battery units, ensure the consistency of the power of each battery unit, prevent overcharging or discharging of some units in the battery pack, thereby improving the overall power quality and stability.

[0044] In this embodiment, in addition, the battery box also includes necessary connectors and wires for connecting multiple cement battery cells together and providing convenient charging and discharging interfaces. The shell and packaging materials provide mechanical protection and electrical insulation to ensure the reliable operation of the battery box under various environmental conditions. Through the above design and components, the standard cement battery box can effectively store and supply electrical energy, is suitable for a variety of application scenarios, and ensures power quality and system stability.

[0045] In this embodiment, 3D printing technology (including but not limited to) is used to realize the mass production of cement batteries. Through standardized modular design, the battery box can be freely stacked and disassembled according to demand. Its external structure is equipped with positive and negative lead pins, and the top and bottom are each provided with a support platform made of four supporting small cylinders. These top supporting cylindrical platforms can lead out two positive and negative positioning pins, and the bottom of the box is partially hollowed out according to the lead cylindrical platform to facilitate positioning when multiple battery boxes are stacked, thereby realizing the mutual connection of positive and negative electrodes (including but not limited to this connection).

[0046] In this embodiment, in a charging station, a gas station, or an upgrade of an existing charging or gas station (hereinafter referred to as a charging station), it is only necessary to place the cement battery module on the ground or underground. Photovoltaic panels and surrounding wind power generation equipment are configured on the top of the charging station to continuously charge the cement battery module. By predicting weather and wind power through big data analysis, sufficient energy storage space is reserved in advance so that low-priced electricity can be charged into the cement battery pack in the early morning. Taking into account the jitter of switching between groups during the rapid discharge of the cement battery pack, each charging pile is equipped with a small energy storage battery (such as a lead-acid battery, a lithium-ion battery, a sodium-ion battery or a lithium-sulfur battery, hereinafter referred to as an intermediate energy storage battery). When the intermediate energy storage battery is not fully charged, the cement battery will continue to charge it. When new energy vehicles are charged using charging piles, the intermediate energy storage battery can quickly provide high-voltage, high-current fast charging. Therefore, the cost of electricity stored in the cement battery module is low and the source is green, and the charging cost of new energy vehicles is the same during the day and at night. This will promote the number of times new energy vehicles are charged during the day and promote the development of new energy vehicles.

[0047] In this embodiment, please refer to Figure 1 The cement battery ④ shown in the figure is used as the main power storage of the whole system. The power stored comes from ①. The wind turbine uses air flow to drive the blades to rotate. The blades are connected to the power generation machinery and convert kinetic energy into electrical energy through the principle of electromagnetic induction. ②. Photovoltaic power generation is based on the photovoltaic effect. When sunlight shines on semiconductor materials (such as silicon), the photon energy stimulates the movement of electrons to form current. ③. The power grid has a lower electricity price during the off-peak period. By purchasing and storing electricity during this period, costs can be optimized. The system combines the weather forecast data of sunlight and wind power, intelligently predicts and allocates wind and photovoltaic power generation, and automatically charges the remaining power during the period of low electricity price in the power grid; when the cement battery is full, the system automatically disconnects all continuous power generation storage such as wind power and photovoltaic power. At this time, the electricity generated by photovoltaic and wind power will be stored in the power grid according to local policies; when new energy vehicles are charging, the system will control the discharge of cement batteries ④ through the battery management system (BMS 1-5); when multiple groups of cement batteries are in the battery management system, the control circuit automatically switches the cement battery charge and discharge switch according to the temperature and remaining power of the cement battery group, and the small energy storage ⑤ connected in parallel in the circuit plays a role in stabilizing voltage and current to deal with the jitter problem during switching when the cement battery group is discharged rapidly.

[0048] The realization of cement energy storage battery and low electricity price system, in this embodiment, based on the above-mentioned ordinary cement battery, Figure 2Improved implementation to increase the capacity of the actual cement battery during charging. When external voltage is applied to the two plates of the cement battery, like ordinary capacitors, the positive electrode of the plate stores positive charge and the negative plate stores negative charge. Under the action of the electric field of the upper charge on the two plates of the cement battery, opposite charges are formed at the interface between the electrolyte and the electrode to balance the internal electric field of the electrolyte. As the cement battery discharges, the charges on the positive and negative plates are discharged by the external circuit, and the charge on the interface of the electrolyte decreases accordingly. It can be seen from this that the charging and discharging process of supercapacitors is always a physical process without chemical reactions, so the charging and discharging life is very long. ( Figure 2 ) Make two positive and negative capacitor molds, and use metals (such as aluminum, including but not limited to) that are not easy to produce chemical reactions, have good conductivity and low price as the outer frame; in the negative electrode mold, except for the right side (i.e., attached to the edge of the diaphragm), the outer frame is made of metal sheets, and the top is a circular arc convex, while the bottom of the negative electrode is a circular arc concave shape; in the positive electrode capacitor mold, except for the left side (i.e., attached to the edge of the diaphragm), the outer frame is made of metal sheets, and the top is a square convex, while the bottom of the positive electrode is a square concave shape; in the outer frame mold, the top is made convex and the bottom is made concave, which is convenient for installation without error and the contact surface is more solid. This design can realize free parallel connection in the circuit, and if a cement battery in the series circuit is abnormal, the aluminum collector of the abnormal cement battery can still continue to conduct electricity without affecting the circuit flow (the arc square shape of the top and bottom of the battery designed in the current experiment are all designed by the experiment, but including but not limited to this design method); by pouring the outermost frame ( Figure 2 (3)) The corresponding holes are left at the top and bottom, and the corresponding cover plates are cast to simulate the cement battery. The cement is hardened for at least 28 days and demoulding is carried out in accordance with the conventional concrete engineering specifications. Figure 2 (2)) The aluminum collector modules are respectively loaded into the corresponding cement mold positions, and after mixing carbon black and sodium chloride in a specific ratio, conductive metal powder ferroferric oxide (including but not limited to other metals with low price, high dielectric parameters and chemical resistance and comprehensive cost-effectiveness) is added and stirred evenly to increase the conductivity. At this time, a capacitor is formed, which can increase the capacity of the cement battery. After the mixture of black carbon, sodium chloride and ferroferric oxide is loaded into the positive and negative aluminum molds, it is compacted multiple times without leaving any extra gaps, so that the collector and the electrolyte are in better contact and the conductivity is improved. In addition, an insulating diaphragm is used to separate the anion and cation in the positive and negative aluminum molds. The closer the anion and cation are in the capacitor, the greater the amount of electricity stored in the capacitor; in order to ensure the safety of the anion and cation diaphragms, thin cement plates are used to cover both sides of the diaphragm (the current experiment uses thin cement plates to protect the battery from breakdown, including but not limited to using other materials as diaphragms or protective diaphragms), which effectively enhances the strength of the insulating diaphragm and improves safety. A small amount of cement slurry is used to fit and seal the thin cement plate cover and the cement sealing position.

[0049] In this embodiment, after a sample cement battery is made based on the above, the positive and negative electrodes of the DC power supply are connected to the corresponding positive and negative electrode positions of the sample cement battery through wires. After the control circuit is powered on, the cement battery is under constant voltage. The current decreases as the space that can be charged into the cement battery decreases, until the cement battery and the DC power supply voltage are consistent, indicating that the cement battery is full. Then, the full cement battery is connected to the positive and negative electrodes of the load end through the positive and negative electrodes, and after the control cement battery is powered on, the voltage of the cement battery gradually decreases over time.

[0050] In this embodiment, based on the cement batteries made above, a group of cement battery groups are connected in series according to needs, and then multiple groups of cement battery groups are connected in parallel, and then connected in parallel through circuits. Temperature sensors and power detection devices in the circuit are installed on the surface of the cement battery. In order to ensure the efficient operation and safety of the battery, a battery management system (BMS1-5) is equipped in the system environment. The functions of the system include: ① Monitoring and management: real-time monitoring of the status of each cement battery unit, including parameters such as voltage, current and capacity; ② Temperature monitoring: continuous monitoring of the temperature of the cement battery to ensure that it operates within a safe operating temperature range to avoid the impact of overheating or low temperature on battery performance; ③ Charge and discharge protection: provide overcharge and over-discharge protection to prevent the battery from overcharging or over-discharging, so as to extend battery life and improve safety; ④ Balanced charge and discharge: realize balanced charging and discharging between battery cells, ensure that the power of each battery cell is consistent, and prevent some cells in the battery pack from overcharging or discharging, thereby improving the overall power quality and stability.

[0051] In this embodiment, according to the attached Figure 2 The structure diagram of the cement battery is shown: the outer frame of the cement battery and the partition between the positive and negative electrodes are composed of cement plates, (3 in the figure) is an aluminum current collector, and the top and bottom of the cement battery are made into arc and square shapes, which are convenient for cement battery stacking and solving installation errors; the material wrapped by the aluminum current collector is composed of carbon black and sodium chloride, which form anions and cations after polarization.

[0052] In this embodiment, according to the attached Figure 3 Circuit system logic structure diagram, 21 cement battery is the main power storage in the whole system, and the stored power comes from 23 photovoltaic, wind power generation system and low electricity price period of regional power grid (such as low electricity price from 0:00 to 8:00 in some areas); the power grid controls the current through 2 variable resistors through 20 circuit bridge method to meet the circuit requirements.

[0053] In this embodiment, the system's initial network access logic is as follows: 1. The local management system and 17. The cloud management system form a long link and a persistent link through the network. Each charging station will enter and set a low electricity price period, and configure data and policies in the 17. The cloud management system will synchronize them in real time to 1. The local management system of each charging station. When there is an Ethernet anomaly, each charging station can also rely on the data synchronized and cached by 1. The local management system operates normally, and when the Ethernet is normal, the long link synchronization data and other operations can be restored.

[0054] In this embodiment, the power grid charges at a low electricity price: when the 17 cloud management system detects that the set low electricity price time has arrived, it immediately notifies the 1 local management system to start charging and detects the total chargeable amount of the 21 cement batteries. If the chargeable amount of the battery is lower than the preset threshold, there is no need to charge; if it is higher than the preset threshold, the 1 local management system controls the 15 control board to open the 8 switch, close the 9 switch and close the 24 switch. At this time, the power grid is directly connected to the load-end charging pile 19, and the charging or non-charging is directly controlled by the 6 or 7 switch; at the same time, the 1 local management system intelligently controls the 4 switches and 3 switches of each group of batteries to close according to the temperature and remaining power of each group of 21 cement batteries, and the power of the power grid is charged into the 21 cement batteries; at the same time, the parallel 18 small energy storages will intelligently feed back their own power to the 1 local management system to control the 15 control board to control the switch 5 to decide whether to charge or not; when the 15 control board detects that a group of 21 cement batteries is full, it controls the 3 switches and 4 switches to be opened at the same time until all 21 cement battery groups reach the charge amount preset by the algorithm and the 18 small energy storages are full.

[0055] In this embodiment, green energy charging: 23 photovoltaic and wind power generation systems interact with 1 local management system, 1 local management system detects in real time the status of each group 21 cement battery and 18 small energy storage, and the amount of electricity that can be stored. If the amount of electricity that can be stored is lower than the threshold, 1 local management system controls 15 control board to operate 22 bidirectional switch to 12 grid-connected switch, at which time the electricity generated by 23 photovoltaic and wind power generation systems will be incorporated into the power grid; until each group 21 cement battery can be charged or the amount of electricity stored is higher than the preset threshold, 1 local management system controls 15 control board Operate 22 two-way switches to run to 13 storage switches, control switches 3 and 4 to close according to the amount of chargeable electricity in 21 cement batteries, and at the same time control switch 5 to close so that 18 small energy storages can automatically store energy according to the actual situation. During the charging process, 1 local management system will intelligently dispatch switches of each group of 21 cement batteries and 18 small energy storages according to the electricity generated by the photovoltaic and wind power generation systems detected 23 until the storage electricity of each group of 21 cement batteries and 18 small energy storages is fully charged; 1 local management system controls 15 control board to operate 22 two-way switches to run to 12 grid-connected switches.

[0056] In this embodiment, discharge during non-low electricity price periods: during the local non-electricity price period, the 17 cloud management system notifies the 1 local management system to control the opening of switch 24 and the opening of switch 9 through the 15 control board; when a new energy vehicle comes to charge, the 1 local management system controls the closure of the 6 switches corresponding to the 19 charging pile, controls the 3 switches and 4 switches of the 21 cement battery to close the loop, and also controls the 5 switches of the 18 small energy storage to close; the 18 small energy storage plays a role in stabilizing voltage and current in the circuit, and controls the 21 cement battery temperature and discharge control of all battery packs through the BMS battery energy management 15 control board in the 1 local management system, and controls each 21 cement battery and battery 3 and 4 to open It accurately calculates the voltage and power in the circuit, and intelligently dispatches 18 small energy storages for absorption or discharge to keep the circuit stable, so that the 19 charging piles are always in a relatively stable charging environment; when the new energy vehicle is fully charged or the user chooses to stop charging, the 19 charging piles notify 1 local management system to control 15 control boards to turn on 6 switches of the corresponding charging piles, and then detect whether there are other new energy vehicles charging. If there are other vehicles charging, the current and voltage of the charging piles currently being charged will be continuously controlled to remain stable; until there are no vehicles charging, 1 local management system controls 15 control boards to control all 21 cement batteries to turn on switches 3 and 4.

[0057] In this embodiment, during the charging and discharging process, a local management system detects the charging temperature and abnormal problems of all energy storage batteries in real time. If an abnormality occurs, the safety alarm system is controlled and pushed to the cloud management system simultaneously.

[0058] Noun analysis in this embodiment:

[0059] 1-1 High-efficiency water reducing agent: A HRWRA based on polynaphthalene sulfonate PNS, i.e. high range water reducing agent. Polynaphthalene sulfonate (PNS) is a high-performance cement admixture, often used as a water reducing agent. HRWRA stands for High Range Water Reducing Admixture, which is an additive used in concrete and cement products that can significantly reduce the amount of cement required for concrete, thereby improving the strength and durability of concrete. Its active ingredient is polynaphthalene sulfonate. This additive can act as a water reducing agent in concrete, thereby achieving better fluidity and workability, while reducing the water-cement ratio of concrete and improving the strength and durability of concrete.

[0060] 1-2W / C mass ratio: W / C mass ratio refers to the mass ratio of water to cement in concrete. In concrete, the ratio of cement to water has an important influence on the performance and characteristics of concrete. W / C mass ratio is usually used to describe the mix ratio of concrete, that is, the ratio between the amount of cement and the amount of water.

[0061] 1-3CSH nanoparticle surface: CSH (calcium silicate gel) is an important component of cement hydration products, and it plays a vital role in cement hydration reaction. CSH is the main gelling agent in cement hydration products, which can fill the pores in the cement matrix and increase the density and strength of concrete.

[0062] 1-4KCI: KCl stands for potassium chloride, a common chemical with many uses and applications; potassium chloride is a colorless crystal that is solid at room temperature. It can be dissolved in water to form a potassium chloride solution, which has a certain electrical conductivity.

[0063] 1-5BMS: Battery Management System (BMS) is a system used to monitor and control rechargeable batteries to ensure battery safety, performance and life.

[0064] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A low-electricity-cost charging station system, characterized in that: By utilizing the low electricity price period at night, cement battery technology is used to store electric energy. During the day, photovoltaic panels and wind power generation systems configured in the charging station are used to supplement and charge the cement batteries. Electric energy can be provided to the charging piles at low cost both during the day and at night. The cement battery is made of a mixture of cement, carbon black and auxiliary additives. A carbon network with electronic conductivity is formed through a hydration process. The carbon network contains a pore structure inside, which is used as a charge storage medium. A mixture with cement and carbon black as the main components is used as an electrode material, and a neutral pH KCl solution is used as the electrolyte to improve the safety of the battery and its compatibility with cement materials.

2. The low electricity cost charging station system according to claim 1, characterized in that: The cement battery adopts a standardized modular design and uses a diaphragm to isolate the positive and negative electrodes and the electrolyte to ensure safe and efficient operation between battery cells.

3. The low electricity cost charging station system according to claim 2, characterized in that: The charging station system also includes a battery management system, which is used to monitor the voltage, current, capacity and temperature of the cement battery cells in real time, implement charge and discharge protection, ensure that the battery operates within a safe temperature range, and achieve balanced charge and discharge between battery cells.

4. The low electricity cost charging station system according to claim 3, characterized in that: The photovoltaic panels and wind power generation devices configured in the charging station cooperate with big data analysis and intelligently adjust the storage and distribution of electricity according to weather and wind forecast results to ensure that the cement battery packs are fully energy-storing during periods of low electricity prices.

5. The low electricity cost charging station system according to claim 4, characterized in that: Each of the charging piles is equipped with a small energy storage battery as a buffer to cope with the jitter during switching due to insufficient energy from the cement battery's rapid discharge.

6. The low electricity cost charging station system according to claim 5, characterized in that: The charging station system is combined with a microgrid distributed energy system to provide an integrated energy management and utilization solution for smart buildings and cities.

7. The low electricity cost charging station system according to claim 6, characterized in that: The battery box of the cement battery adopts a stackable structure for installation and expansion, and a packaging material with mechanical protection and electrical insulation is arranged on the outside.

8. The low electricity cost charging station system according to claim 7, characterized in that: The charging station system is integrated with the building, with the cement battery embedded in the building structure and connected to the photovoltaic panels and wind power generation equipment on the building surface.

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