Liquid-cooled energy storage self-power generation device and method

Abstract

The application belongs to the technical field of energy storage equipment, and provides a liquid-cooled energy storage self-power generation device and method, which comprises an energy storage battery for charging and discharging, a battery heat preservation plate arranged on the surface of the energy storage battery, a charging circuit having one end connected with the outlet of the battery heat preservation plate and the other end connected with the inlet of the energy storage battery, and first to fifth pipelines, wherein the charging circuit is used for charging the energy storage battery. The high-temperature liquid of the battery heat preservation plate can be converted into electric energy on one hand and charge the energy storage battery through the charging circuit, and on the other hand, the high-temperature liquid can be heat-exchanged, and the cooled liquid returns to the battery heat preservation plate, so that waste heat collection is realized in the cooling process.

Description

Technical Field

[0001] This invention belongs to the field of energy storage equipment technology, and specifically relates to a liquid-cooled energy storage self-generating device and method. Background Technology

[0002] With the development of distributed energy technology, solar photovoltaic (PV) power generation and wind power generation have become the most watched distributed energy systems in the power system. my country is already a world leader in the utilization of wind and solar energy. In PV and wind power generation systems, to avoid the mismatch between renewable energy generation and user load caused by the uncertainty of wind and solar energy resources, a certain capacity of energy storage device is configured into the system to ensure the power quality, reliability, stability, and security of the power supply. PV / wind power generation systems can continuously charge energy storage systems, which can supply power to users during peak electricity demand and serve as emergency power sources when the grid fails. During the charging and discharging process, energy storage systems generate a large amount of waste heat. The conversion efficiency of batteries in energy storage systems is greatly affected by ambient temperature, and the conversion efficiency is highest within a certain temperature range. This waste heat is low-quality thermal energy and is not utilized, resulting in a large amount of energy waste. Summary of the Invention

[0003] To address at least one of the problems in the background art, the present invention proposes a liquid-cooled energy storage self-generating device and method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Liquid-cooled energy storage self-generating devices include:

[0006] Energy storage batteries are used for charging and discharging.

[0007] A battery insulation plate is installed on the surface of the energy storage battery;

[0008] The charging circuit connects to the outlet of the battery insulation plate at one end to convert the potential energy of the insulation liquid into electrical energy, and to the inlet of the energy storage battery at the other end to charge the energy storage battery.

[0009] The first pipeline is connected at one end to the outlet of the battery insulation plate and at the other end to the inlet of the battery insulation plate, and is used to cool the battery insulation plate.

[0010] The second pipeline, with both ends connected to the first pipeline, is used for heat exchange through the liquid in the first pipeline;

[0011] The evaporator is equipped with a first liquid inlet, a first liquid outlet, a refrigerant inlet, a refrigerant outlet, a second liquid inlet, and a second liquid outlet.

[0012] The third pipeline is connected at one end to the first pipeline and at the other end to the first liquid inlet of the evaporator.

[0013] The fourth pipeline is connected at one end to the first liquid outlet of the evaporator and at the other end to the inlet of the battery insulation plate.

[0014] The fifth pipe is connected at one end to the refrigerant inlet of the evaporator and at the other end to the refrigerant outlet of the evaporator, and is used for heat exchange of the liquid in the second pipe.

[0015] An air handling unit is connected at one end to the second liquid inlet of the evaporator and at the other end to the second liquid outlet of the evaporator, and is used for cooling or heating.

[0016] Preferably, the charging line includes a pump, a water turbine generator, and an inverter;

[0017] The pump inlet is connected to the battery insulation plate outlet, the water turbine generator is connected to the pump outlet, one end of the inverter is electrically connected to the water turbine generator, and the other end is electrically connected to the energy storage battery.

[0018] Preferably, the first pipeline includes a pump, a water turbine generator, a pressure tank, and a heat exchanger connected in series.

[0019] The heat exchanger is connected to the inlet of the battery insulation plate.

[0020] Preferably, the second pipeline is equipped with a condenser, and a liquid pipe is installed inside the condenser. One end of the liquid pipe is connected to the inlet of the water turbine generator, and the other end is connected to the outlet of the heat exchanger.

[0021] Preferably, one end of the third pipeline is connected to the outlet of the pressure stabilizing tank in the first pipeline.

[0022] Preferably, the fifth pipeline is provided with a refrigerant pipe connected in series with the compressor and the condenser;

[0023] The compressor inlet is connected to the refrigerant outlet of the evaporator;

[0024] The refrigerant pipe is connected to the refrigerant inlet of the evaporator;

[0025] The refrigerant tube exchanges heat with the liquid tube.

[0026] Preferably, the first, second, third, fourth, and fifth pipelines are all equipped with valves.

[0027] The liquid-cooled energy storage self-generation method, used in the aforementioned liquid-cooled energy storage self-generation device, includes the following steps:

[0028] Acquire energy storage battery temperature data;

[0029] Determine if the temperature of the energy storage battery exceeds the maximum threshold. If so, cool the liquid inside the battery insulation plate and charge the energy storage battery. If not, proceed to the first step.

[0030] First step: Determine if the temperature of the energy storage battery is below the minimum threshold. If yes, proceed to the second step; otherwise, do nothing.

[0031] The second step is to determine whether the heating function of the air handling unit is operating. If so, it is determined that the user has a need for air conditioning heating, and the energy storage battery is heated. If not, a low temperature warning message is output.

[0032] Preferably, cooling the liquid inside the battery insulation plate and charging the energy storage battery includes the following steps:

[0033] The kinetic energy of the liquid in the battery insulation plate is converted into mechanical energy through the charging circuit, and then the mechanical energy is converted into electrical energy to charge the energy storage battery.

[0034] At the same time, the first pipeline is opened, and the liquid is cooled through the heat exchanger of the first pipeline;

[0035] At the same time, it determines whether the air handling unit's cooling function is operating. If so, it opens the second pipeline, and the liquid flowing out of the heat exchanger in the first pipeline condenses the refrigerant in the condenser in the second pipeline. Then, the cooled liquid flows back to the second pipeline to generate electricity, and finally returns to the battery insulation plate.

[0036] Preferably, determining that the user has a need for air conditioning heating and heating the energy storage battery includes the following steps:

[0037] Open the third and fourth pipes, and introduce the liquid in the pressure tank in the first pipe into the liquid pipe of the evaporator. Then, heat the liquid in the liquid pipe based on the refrigerant in the refrigerant pipe of the evaporator. The heated liquid flows back to the battery insulation plate to heat the energy storage battery.

[0038] The beneficial effects of this invention are:

[0039] 1. By setting up a charging line and a first pipeline, the high-temperature liquid in the battery insulation plate can convert kinetic energy into electrical energy and charge the energy storage battery through the charging line. On the other hand, it can also exchange heat with the high-temperature liquid and return the cooled liquid to the battery insulation plate, thus realizing waste heat collection during the cooling process.

[0040] 2. This invention incorporates a second pipeline that allows the cooled liquid to enter the condenser, thereby cooling the refrigerant and returning it to the evaporator. This pipeline improves heat exchange efficiency and promotes refrigerant circulation.

[0041] 3. By setting up a third and a fourth pipeline, when the temperature of the energy storage battery is low, the low-temperature liquid in the battery insulation plate can be extracted and heated by heat exchange through an evaporator. The heated liquid is then returned to the battery insulation plate, thereby increasing the temperature of the energy storage battery and further improving the waste heat utilization rate.

[0042] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the structure of the liquid-cooled energy storage self-generating device of the present invention is shown;

[0045] Figure 2 A diagram showing the charging and discharging connection relationship of the energy storage battery of the present invention is provided.

[0046] In the diagram: 1. Energy storage battery; 2. Battery insulation board; 3. Pump; 4. Hydro generator; 5. Pressure stabilizing tank; 6. Heat exchanger; 7. Inverter; 8. Condenser; 9. Compressor; 10. Evaporator; 11. Air handling unit. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Liquid-cooled energy storage self-generating devices, such as Figure 1 As shown, it includes an energy storage battery 1, a battery insulation plate 2, an evaporator 10, an air handling unit 11, a charging line, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, and a fifth pipeline.

[0049] Among them, energy storage battery 1 is used for charging and discharging, and its application is particularly widespread in photovoltaic equipment. For example... Figure 2 As shown, the photovoltaic device is connected to a DC power combiner box, which is then connected to a DC power distribution cabinet. The DC power distribution cabinet is then connected to a grid-connected inverter, which finally charges or discharges the energy storage battery 1. A battery insulation plate 2 is installed on the surface of the energy storage battery 1, its main function being to maintain the temperature of the energy storage battery 1 within a safe range.

[0050] One end of the charging line is connected to the outlet of the battery insulation plate 2, and the other end is connected to the inlet of the energy storage battery 1, for charging the energy storage battery 1. Specifically, a pump 3, a water turbine generator 4, and an inverter 7 are connected in series on the charging line. The inlet of the pump 3 is connected to the liquid outlet of the battery insulation plate 2, the water turbine generator 4 is connected to the outlet of the pump 3, one end of the inverter 7 is electrically connected to the water turbine generator 4, and the other end is electrically connected to the energy storage battery 1. In operation, the pump 3 extracts the liquid from the battery insulation plate 2 and then delivers it to the water turbine generator 4, using the potential energy of the water to generate electricity. The electricity is then used to charge the energy storage battery 1 through the inverter 7.

[0051] One end of the first pipeline is connected to the outlet of the battery insulation plate 2, and the other end is connected to the inlet of the battery insulation plate 2, for cooling the battery insulation plate 2. Specifically, a pump 3, a water turbine generator 4, a pressure stabilizing tank 5, and a heat exchanger 6 are connected in series on the first pipeline, with the heat exchanger 6 connected to the liquid inlet of the battery insulation plate 2. During operation, the pump 3 draws out the high-temperature liquid from the battery insulation plate 2, which is then used to generate electricity by the water turbine generator 4. The high-temperature liquid then enters the pressure stabilizing tank 5 for pressure stabilization, and then enters the heat exchanger 6 for heat exchange and cooling. Finally, the cooled liquid returns to the battery insulation plate 2.

[0052] It should be noted that pump 3 and water turbine generator 4 are shared in the charging line and the first pipeline, which ensures that the electricity generated by water turbine generator 4 and the liquid passing through water turbine generator 4 can be fully utilized.

[0053] The second pipeline is connected to the first pipeline at both ends and is used to cool the liquid in the first pipeline. Specifically, a condenser 8 is installed on the second pipeline. Inside the condenser 8, there is a liquid pipe. One end of the liquid pipe is connected to the inlet of the water turbine generator 4, and the other end is connected to the outlet of the heat exchanger 6. In operation, if the cooled liquid enters the condenser 8, it will cool the refrigerant passing through the condenser 8. Then, the heated liquid returns to the water turbine generator 4 for secondary power generation, then continues to flow into the heat exchanger 6 for cooling, and finally returns to the battery insulation plate 2.

[0054] The evaporator 10 is equipped with a first liquid inlet, a first liquid outlet, a refrigerant inlet, a refrigerant outlet, a second liquid inlet, and a second liquid outlet. In addition, one end of the third pipeline is connected to the outlet of the pressure stabilizing tank 5 in the first pipeline, and the other end is connected to the first liquid inlet of the evaporator 10; one end of the fourth pipeline is connected to the first liquid outlet of the evaporator 10, and the other end is connected to the inlet of the battery insulation plate 2.

[0055] It should be noted that the third and fourth pipes form a heating pipe for cryogenic liquid. In operation, the cryogenic liquid from the water turbine generator 4 enters the evaporator 10 and is then heated. The heated liquid returns to the battery insulation plate 2 through the fourth pipe.

[0056] The fifth pipeline is connected at one end to the refrigerant inlet of the evaporator 10 and at the other end to the refrigerant outlet of the evaporator 10, for heat exchange with the liquid in the second pipeline. Specifically, the fifth pipeline is equipped with a compressor 9 and a refrigerant pipe connected in series in the condenser 8; the inlet of the compressor 9 is connected to the refrigerant outlet of the evaporator 10; the refrigerant pipe is connected to the refrigerant inlet of the evaporator 10 to facilitate heat exchange between the refrigerant pipe and the liquid pipe. The air handling unit 11 (i.e., air conditioner) is connected at one end to the second liquid inlet of the evaporator 10 and at the other end to the second liquid outlet of the evaporator 10, for cooling or heating.

[0057] It should be noted that, in Figure 1 The condenser 8, compressor 9, evaporator 10, and air handling unit 11 are the main equipment for realizing refrigerant circulation. The refrigerant outlet of the evaporator 10 is connected to the compressor 9. After passing through the compressor 9, the refrigerant enters the cold medium inlet of the condenser 8. The cold medium outlet of the condenser 8 is connected to the refrigerant inlet of the evaporator 10. The refrigerant in the evaporator 10 evaporates under low pressure, turns into vapor, and absorbs heat from the air being cooled. The vapor is then discharged as cold air through the air handling unit 11. The refrigerant vapor is compressed by the compressor 9 and enters the cold medium inlet of the condenser 8.

[0058] Furthermore, valves are installed in the second, third, fourth, and fifth pipelines. Specifically, from... Figure 1 It can be seen that valve a is installed between heat exchanger 6 and condenser 8 in the second pipeline, valve b is installed between condenser 8 and evaporator 10 in the fifth pipeline, valve c is installed between battery insulation plate 2 and heat exchanger 6 in the first pipeline, valve d is installed in the third pipeline, and valve e is installed in the fourth pipeline. The above valves a to e can be selected as needed, and the on / off state of the first pipeline to the fifth pipeline can also be controlled by controlling the closing of valves a to e.

[0059] The liquid-cooled energy storage self-generation method, used in the aforementioned liquid-cooled energy storage self-generation device, includes the following steps:

[0060] S1: Obtain temperature data for energy storage battery 1;

[0061] S2: Determine whether the temperature of the energy storage battery 1 is greater than the maximum threshold. If yes, cool the liquid in the battery insulation plate 2 and charge the energy storage battery 1. If no, proceed to the first step.

[0062] S3: First step: Determine if the temperature of energy storage battery 1 is less than the minimum threshold. If yes, proceed to the second step; otherwise, do nothing.

[0063] S4: Second step: Determine whether the heating function of the air handling unit 11 is running. If yes, determine that the user has a need for air conditioning heating and heat the energy storage battery 1; otherwise, output a low temperature warning message.

[0064] Further, the liquid inside the battery insulation plate 2 is cooled and the energy storage battery 1 is charged, including the following steps: S201: The kinetic energy of the liquid in the battery insulation plate 2 is converted into mechanical energy through the charging circuit, and then the mechanical energy is converted into electrical energy to charge the energy storage battery 1; S202: At the same time, the first pipeline is opened, and the liquid is cooled through the heat exchanger 6 of the first pipeline; at the same time, it is determined whether the cooling function of the air handling unit 11 is running. If so, the second pipeline and the fifth pipeline are opened, the compressor 9 cools the high-temperature refrigerant, and then delivers it to the condenser 8. At the same time, the liquid flowing out of the heat exchanger 6 in the first pipeline condenses the refrigerant in the condenser 8 in the second pipeline. Then the cooled liquid flows back to the second pipeline to generate electricity, and finally returns to the battery insulation plate 2.

[0065] Furthermore, determining that the user has a need for air conditioning heating, the energy storage battery 1 is heated, including the following steps:

[0066] S401: Open the third and fourth pipelines, introduce the liquid in the pressure tank 5 in the first pipeline into the liquid pipe of the evaporator 10, and heat the liquid in the liquid pipe based on the refrigerant in the refrigerant pipe in the evaporator 10. The heated liquid flows back to the battery insulation plate 2 to heat the energy storage battery 1.

[0067] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid-cooled energy storage self-generating device, characterized in that, include: Energy storage battery (1), used for charging and discharging; A battery insulation plate (2) is installed on the surface of the energy storage battery (1); The charging line is connected at one end to the outlet of the battery insulation plate (2) and at the other end to the inlet of the energy storage battery (1) for charging the energy storage battery (1); the charging line includes a pump (3), a water turbine generator (4) and an inverter (7); the inlet of the pump (3) is connected to the outlet of the battery insulation plate (2), the water turbine generator (4) is connected to the outlet of the pump (3), and one end of the inverter (7) is electrically connected to the water turbine generator (4) and the other end is electrically connected to the energy storage battery (1); The first pipeline is connected at one end to the outlet of the battery insulation plate (2) and at the other end to the inlet of the battery insulation plate (2) for cooling the battery insulation plate (2); the first pipeline includes a pump (3), a water turbine generator (4), a pressure stabilizing tank (5) and a heat exchanger (6) connected in series. The second pipeline, with both ends connected to the first pipeline, is used for heat exchange through the liquid in the first pipeline; The second pipeline is equipped with a condenser (8), and a liquid pipe is installed inside the condenser (8). One end of the liquid pipe is connected to the inlet of the water turbine generator (4), and the other end is connected to the outlet of the heat exchanger (6). The evaporator (10) is provided with a first liquid inlet, a first liquid outlet, a refrigerant inlet, a refrigerant outlet, a second liquid inlet, and a second liquid outlet; The third pipeline is connected at one end to the first pipeline and at the other end to the first liquid inlet of the evaporator (10); one end of the third pipeline is connected to the outlet of the pressure stabilizing tank (5) in the first pipeline; The fourth pipeline is connected at one end to the first liquid outlet of the evaporator (10) and at the other end to the inlet of the battery insulation plate (2); The fifth pipeline is connected at one end to the refrigerant inlet of the evaporator (10) and at the other end to the refrigerant outlet of the evaporator (10), and is used for heat exchange between the liquid in the second pipeline; the fifth pipeline is equipped with a compressor (9) and a refrigerant pipe in the condenser (8) connected in series; the inlet of the compressor (9) is connected to the refrigerant outlet of the evaporator (10); the refrigerant pipe is connected to the refrigerant inlet of the evaporator (10); the refrigerant pipe exchanges heat with the liquid pipe; An air handling unit (11) is connected at one end to the second liquid inlet of an evaporator (10) and at the other end to the second liquid outlet of an evaporator (10) for cooling or heating.

2. The liquid-cooled energy storage self-generating device according to claim 1, characterized in that, The heat exchanger (6) is connected to the inlet of the battery insulation plate (2).

3. The liquid-cooled energy storage self-generating device according to claim 1 or 2, characterized in that, Valves are installed in the first, second, third, fourth and fifth pipelines.

4. A liquid-cooled energy storage self-generation method, characterized in that, The liquid-cooled energy storage self-generating device according to any one of claims 1-3 comprises the following steps: Acquire temperature data of energy storage battery (1); Determine whether the temperature of the energy storage battery (1) is greater than the maximum threshold. If so, cool the liquid in the battery insulation plate (2) and charge the energy storage battery (1). If not, proceed to the first step. First step: Determine whether the temperature of the energy storage battery (1) is less than the minimum threshold. If yes, proceed to the second step. If no, do not take any action. The second step is to determine whether the heating function of the air handling unit (11) is running. If it is, it is determined that the user has a need for air conditioning heating and the energy storage battery (1) is heated. If not, a low temperature warning message is output.

5. The liquid-cooled energy storage self-generation method according to claim 4, characterized in that, Cooling the liquid inside the battery insulation plate (2) and charging the energy storage battery (1) includes the following steps: The kinetic energy of the liquid in the battery insulation plate (2) is converted into mechanical energy through the charging circuit, and then the mechanical energy is converted into electrical energy to charge the energy storage battery (1). At the same time, the first pipeline is opened, and the liquid is cooled through the heat exchanger (6) of the first pipeline; At the same time, it is determined whether the cooling function of the air handling unit (11) is running. If so, the second pipeline is opened, and the liquid flowing out of the heat exchanger (6) in the first pipeline is used to condense the refrigerant in the condenser (8) in the second pipeline. Then the cooled liquid flows back to the second pipeline to generate electricity, and finally returns to the battery insulation plate (2).

6. The liquid-cooled energy storage self-generation method according to claim 4 or 5, characterized in that, Determining that the user has a need for air conditioning heating, and heating the energy storage battery (1), including the following steps: Open the third and fourth pipes, and introduce the liquid in the pressure tank (5) in the first pipe into the liquid pipe of the evaporator (10). Heat the liquid in the liquid pipe based on the refrigerant in the refrigerant pipe in the evaporator (10). The heated liquid flows back to the battery insulation plate (2) to heat the energy storage battery (1).

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