Lithium ion power battery system of transformer substation

Abstract

The utility model relates to a lithium ion power battery system of a transformer substation. The lithium ion power battery system comprises a cooling container, the cooling container is filled with cooling liquid, a supporting structure is fixedly arranged at the inner bottom of the cooling container, a battery module is fixedly arranged through the supporting structure, and a temperature control assembly is arranged on the battery module; the cooling container is provided with a radiator, the output end of the radiator is communicated with the cooling container through a first circulating pipeline, the input end is provided with one end of a second circulating pipeline, and the other end of the second circulating pipeline is communicated with the cooling container; a circulating pump, a valve and a filtering assembly are arranged on the second circulating pipeline; and the controller is fixedly arranged on the cooling container and is electrically connected with the circulating pump, the valve and the temperature control assembly. When the power battery system is used, the safety and the reliability of the battery module are improved through the intelligently adjusted heat dissipation system in the operation process, and meanwhile, the maintenance cost is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of substation energy storage technology, and specifically relates to a substation lithium-ion power battery system. Background Technology

[0002] In substations, lithium-ion power batteries are widely used in energy storage systems due to their advantages such as high energy density, high charge and discharge efficiency, and long service life. However, lithium-ion power batteries generate a lot of heat during charging and discharging. If heat cannot be dissipated in a timely and effective manner, the battery temperature will become too high, which will affect the battery's performance and lifespan, and may even lead to safety accidents.

[0003] Currently, common battery cooling methods mainly include air cooling and water cooling. Air cooling systems have a simple structure and low cost, but their heat dissipation efficiency is limited and cannot meet the heat dissipation requirements of high power density batteries. Water cooling systems have higher heat dissipation efficiency, but there is a risk of coolant leakage. Once coolant leaks into the battery module, it can cause serious consequences such as battery short circuits. In addition, water cooling systems have higher maintenance costs.

[0004] In addition, some existing technologies have attempted to use coolants for heat dissipation, but most coolants have problems such as poor chemical stability and insufficient electrical insulation, making them unable to work safely and effectively when in direct contact with the battery. Utility Model Content

[0005] The purpose of this invention is to provide a lithium-ion power battery system for substations to solve the problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a substation lithium-ion power battery system, including a cooling container filled with coolant, a support structure fixedly installed at the bottom of the container, a battery module fixedly installed through the support structure, and a temperature control component installed on the battery module, the temperature control component being used to monitor the temperature change of the battery module in real time.

[0007] A radiator is fixedly installed on the top of the cooling container. The output end of the radiator is connected to the cooling container through a first circulation pipe, and the input end is connected to one end of a second circulation pipe. The other end of the second circulation pipe is connected to the cooling container. A circulation pump, a valve, and a filter assembly are installed on the second circulation pipe. The circulation pump is used to drive the circulation flow of the coolant. The valve is used to regulate the flow rate of the coolant. The filter assembly is used to filter impurities in the coolant.

[0008] The controller is fixedly mounted on the cooling container and electrically connected to the circulating pump, valve, and temperature control component. The controller is used to analyze and collect data from the temperature control component and intelligently adjust the circulating pump and valve according to preset parameters.

[0009] When the operating temperature of the battery module is lower than the safety threshold, the coolant absorbs the heat of the battery module and changes from liquid to gas through phase change. The gaseous coolant is condensed into liquid coolant by the radiator and flows back to the cooling container. Through the phase change cooling mechanism, excess heat is efficiently removed and energy consumption is reduced.

[0010] When the operating temperature of the battery module is higher than the safety threshold, the controller controls the circulation pump and valve to accelerate the circulation of coolant and dissipate heat quickly through the radiator, ensuring that the temperature of the battery module is maintained within a safe range and preventing overheating from causing a malfunction.

[0011] As a further improvement of this utility model, the battery module is composed of multiple lithium-ion battery cells connected by wires, and an insulating partition is provided between the lithium-ion battery cells, and the insulating partition has a high thermal conductivity.

[0012] As a further improvement of this utility model, the temperature control component consists of multiple first temperature sensors and a temperature control acquisition chip; the first temperature sensor is attached to the lithium-ion battery cell and electrically connected to the input terminal of the temperature control acquisition chip, and the output terminal of the temperature control acquisition chip is electrically connected to the controller.

[0013] As a further improvement of this utility model, the temperature control component also includes a third temperature sensor, which is disposed on the inner wall of the cooling container and electrically connected to the input terminal of the temperature control acquisition chip, for collecting the working temperature change of the coolant.

[0014] As a further improvement of this utility model, the radiator adopts a finned tube heat exchanger structure, which is composed of multiple fins and pipes; a second temperature sensor, a flow regulating valve and a cooling fan are also provided on the radiator, and the second temperature sensor, the flow regulating valve and the cooling fan are electrically connected to the controller.

[0015] As a further improvement of this utility model, the cooling container is made of high-strength, corrosion-resistant stainless steel, and a coating with high thermal conductivity is also applied to the inner wall of the cooling container.

[0016] As a further improvement of this utility model, the coolant is a fluorinated liquid phase change coolant, and antioxidants and surfactants are added.

[0017] As a further improvement of this utility model, the filtration assembly includes a filter cartridge and a filter screen, the filter cartridge is installed on the second circulation pipe, and the filter screen is detachably disposed inside the filter cartridge.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. High heat dissipation. Utilizing the phase change characteristics of fluorinated liquid, it can quickly dissipate the heat generated by the battery. The heat dissipation efficiency is far higher than that of traditional air cooling and water cooling methods, effectively reducing the battery's operating temperature and improving battery performance and lifespan.

[0020] 2. High safety. Fluorinated liquid has good chemical stability and electrical insulation. Direct contact with battery modules will not cause corrosion or short circuits to the batteries. Furthermore, the sealed design of the cooling container further ensures the safety of the system.

[0021] 3. High reliability. The controller can monitor and adjust the temperature of the battery module and coolant in real time through the temperature control component, ensuring that the system can operate stably under different operating conditions and reducing failures and safety hazards caused by excessive temperature.

[0022] 4. Low maintenance cost. The power battery system has a relatively simple structure, the coolant does not need to be replaced frequently, and it is not prone to leakage, which reduces maintenance costs and workload. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall connection of a lithium-ion power battery system for a substation.

[0024] Figure 2 This is a schematic diagram of the side connection of a lithium-ion power battery system in a substation.

[0025] The components include: 1. Battery module; 2. Cooling container; 3. Coolant; 4. Radiator; 5. Second circulation pipe; 6. Valve; 7. Circulation pump; 8. Filter assembly; 9. Temperature control assembly; 10. Controller; 11. Support structure; 12. Cooling fan. Detailed Implementation

[0026] See Figures 1 to 2 As shown, a substation lithium-ion power battery system is characterized by: including a cooling container 2, which is filled with coolant 3, and a support structure 11 is fixedly installed at the bottom of the container. A battery module 1 is fixedly installed through the support structure 11, and a temperature control component 9 is installed on the battery module 1. The temperature control component 9 is used to monitor the temperature change of the battery module 1 in real time.

[0027] A radiator 4 is fixedly installed on the top of the cooling container 2. The output end of the radiator 4 is connected to the cooling container 2 through a first circulation pipe, and the input end is provided at one end of a second circulation pipe 5. The other end of the second circulation pipe 5 is connected to the cooling container 2. A circulation pump 7, a valve 6, and a filter assembly 8 are installed on the second circulation pipe 5. The circulation pump 7 is used to drive the circulation flow of the coolant 3. The valve 6 is used to adjust the flow rate of the coolant 3. The filter assembly 8 is used to filter impurities in the coolant 3.

[0028] The controller 10 is fixedly installed on the cooling container 2 and electrically connected to the circulating pump 7, valve 6, and temperature control component 9. The controller 10 is used to analyze and collect data from the temperature control component 9 and intelligently adjust the circulating pump 7 and valve 6 according to preset parameters.

[0029] When the operating temperature of the battery module 1 is lower than the safety threshold, the coolant 3 absorbs the heat of the battery module 1 and changes from liquid to gas through phase change. The gaseous coolant 3 is condensed into liquid coolant 3 by the radiator 4 and flows back to the cooling container 2. Through the phase change cooling mechanism, excess heat is efficiently removed and energy consumption is reduced.

[0030] When the operating temperature of the battery module 1 is higher than the safety threshold, the controller 10 adjusts the circulation pump 7 and valve 6 to accelerate the circulation of the coolant 3 and dissipate heat quickly through the radiator 4, ensuring that the temperature of the battery module 1 is maintained within a safe range and preventing overheating from causing a malfunction.

[0031] In this solution, the heat generated by the battery module 1 under normal operating conditions is absorbed by the coolant 3. The coolant 3 transfers the heat from the surface of the battery module 1 through a phase change. The temperature control component 9 collects the temperature of the battery module 1 and the coolant 3 in real time and transmits it to the controller 10. The controller 10 intelligently adjusts the speed of the circulation pump 7 and the opening of the valve 6 based on the data, thereby precisely controlling the flow rate of the coolant 3 through the second circulation pipe 5 to the radiator 4, that is, controlling the heat dissipation efficiency, achieving a constant temperature of the battery module 1, effectively preventing overheating, and ensuring the efficient and stable operation of the system.

[0032] When the temperature of battery module 1 and coolant 3 exceeds the preset threshold, controller 10 immediately activates emergency cooling mode, increasing the speed of circulation pump 7 and the opening of valve 6 to accelerate the circulation of coolant 3. Heat sink 4 is used for rapid heat dissipation to quickly reduce the temperature, avoiding the risk of thermal runaway and ensuring system safety. Simultaneously, temperature control component 9 continuously monitors the system. Once the temperature returns to a safe range, controller 10 automatically returns to normal operating mode to maintain stable system operation.

[0033] When the temperature of battery module 1 is low, controller 10 automatically reduces the speed of circulation pump 7 and the opening of valve 6 to slow down the circulation of coolant 3 and reduce the heat dissipation of radiator 4, so that the temperature of battery module 1 gradually rises to a suitable range, avoiding excessive cooling that could affect battery performance and ensuring that the system is in optimal working condition.

[0034] In a preferred embodiment, the battery module 1 is composed of multiple lithium-ion battery cells connected by wires. An insulating partition is provided between the lithium-ion battery cells, and the insulating partition has a high thermal conductivity. The insulating partition can not only effectively isolate the heat transfer between the battery cells, but also quickly dissipate excess heat, prevent local overheating, improve the overall heat dissipation effect, ensure uniform temperature distribution inside the battery module 1, extend battery life, and enhance system reliability and safety.

[0035] The lithium-ion battery cells use high-energy-density materials to improve overall energy storage efficiency; the wires adopt a low-resistance design to reduce energy loss, ensure stable current transmission, and further improve the overall performance and reliability of battery module 1.

[0036] Specifically, based on the substation's requirements for battery system voltage and capacity, an appropriate number and specification of lithium-ion battery cells are selected for connection. For example, for applications requiring higher voltage, multiple battery cells are connected in series; for applications requiring larger capacity, parallel connections are used. Through this flexible connection method, battery module 1 can meet the needs of different application scenarios, ensuring voltage and capacity matching, optimizing overall system performance, improving substation operating efficiency and stability, and ensuring the continuity and reliability of power supply. Simultaneously, battery module 1 is connected to controller 10, which has a built-in intelligent battery management system that can monitor the status of individual battery cells in real time, promptly identify and address potential problems, ensuring stable operation of battery module 1 even in complex environments.

[0037] In this scheme, for example, the lithium-ion battery cell is set as a lithium iron phosphate battery: the safe charging and discharging threshold of the lithium iron phosphate battery is set to 50℃.

[0038] When the operating temperature of the lithium iron phosphate battery is below 50°C, the coolant 3 absorbs the operating temperature of the lithium iron phosphate battery and changes from liquid to gas. The gaseous coolant 3 is condensed into liquid coolant 3 by the radiator 4 and flows back to the cooling container 2. Through the phase change cooling mechanism, excess heat is efficiently removed and energy consumption is reduced.

[0039] When the operating temperature of the lithium iron phosphate battery is higher than 50°C, the controller 10 adjusts the circulation pump 7 and valve 6 to accelerate the circulation of the coolant 3 and dissipate heat quickly through the radiator 4, ensuring that the temperature of the lithium iron phosphate battery is maintained within a safe range and preventing overheating from causing a malfunction.

[0040] In a preferred embodiment, the temperature control component 9 consists of a plurality of first temperature sensors and a temperature control acquisition chip; the first temperature sensors are attached to the lithium-ion battery cell and electrically connected to the input terminal of the temperature control acquisition chip, and the output terminal of the temperature control acquisition chip is electrically connected to the controller 10;

[0041] The temperature control component 9 also includes a third temperature sensor, which is disposed on the inner wall of the cooling container 2 and electrically connected to the input terminal of the temperature control acquisition chip, for collecting the operating temperature change of the coolant 3.

[0042] The temperature control acquisition chip aggregates multiple temperature data and transmits them to the controller 10 for intelligent analysis. Under the action of the controller 10, the circulating pump 7 and valve 6 are adjusted in real time to ensure that the battery module 1 operates in the optimal temperature range. This prevents overheating from causing safety hazards and avoids overcooling from affecting performance, thus comprehensively improving system stability and service life.

[0043] In a preferred embodiment, the radiator 4 adopts a finned tube heat exchanger structure, which consists of multiple fins and pipes; a second temperature sensor, a flow regulating valve and a cooling fan 12 are also provided on the radiator 4, and the second temperature sensor, the flow regulating valve and the cooling fan 12 are electrically connected to the controller 10.

[0044] The second temperature sensor monitors the temperature of the radiator 4 in real time, and the flow regulating valve automatically adjusts the flow rate of the coolant 3 according to temperature changes to ensure maximum heat dissipation efficiency. Simultaneously, when the temperature exceeds a safety threshold, the cooling fan 12 is activated under the regulation of the controller 10 to further improve heat dissipation efficiency and accelerate the cooling of the coolant 3. The controller 10 integrates multiple data sources and dynamically optimizes the heat dissipation strategy to further ensure the stable operation of the battery module 1 under efficient heat dissipation, improving overall system performance and safety. Furthermore, the battery module 1 is equipped with multiple safety protection mechanisms, including overcharge, over-discharge, and short-circuit protection, ensuring safe operation even under various extreme conditions. The controller 10 achieves extended battery life and reduced maintenance costs through algorithm optimization. The overall design is compact, easy to install and maintain, suitable for various substation environments, and improves the reliability and economy of the power system.

[0045] In a preferred embodiment, the cooling container 2 is made of high-strength, corrosion-resistant stainless steel. The inner wall of the cooling container 2 is also coated with a coating with high thermal conductivity, which can effectively improve the heat transfer efficiency and accelerate the heat exchange between the coolant 3 and the battery module 1.

[0046] The coolant 3 is a fluorinated liquid phase change coolant, and it contains antioxidants and surfactants.

[0047] Fluorinated liquid phase change coolant possesses low boiling point, high chemical stability, and good electrical insulation. Its boiling point is typically between 30 and 120°C, with the specific value chosen based on application requirements and the composition of the fluorinated liquid. When battery module 1 generates heat during normal operation, coolant 3 rapidly absorbs heat and undergoes a phase change, transforming from a liquid to a gaseous state. After vaporization, coolant 3 is transported to radiator 4 via pipes. In radiator 4, the gaseous coolant 3 releases heat and recondenses into a liquid state, flowing back to cooling container 2, forming a highly efficient circulating cooling system. This process fully utilizes the phase change characteristics of the fluorinated liquid, ensuring a constant temperature for battery module 1 and significantly improving heat dissipation efficiency and system stability.

[0048] The chemical stability of the fluorinated liquid ensures that it will not react chemically with the battery module 1 and cooling container 2 during long-term contact, thus preventing corrosion of the battery and container. Simultaneously, its excellent electrical insulation ensures that even if the coolant 3 comes into direct contact with the battery's electrodes and other charged parts, it will not cause short circuits or other safety issues. The addition of antioxidants and surfactants further enhances the stability and fluidity of the coolant 3, reducing resistance during heat transfer and ensuring the long-term efficient operation of the cooling system. Furthermore, the design of the cooling container 2 fully considers sealing and pressure resistance to prevent coolant 3 leakage and ensure system safety. Through multi-stage optimization, the overall solution achieves stable heat dissipation of the battery module 1 under high-load conditions, extending equipment lifespan and reducing maintenance costs.

[0049] In a preferred embodiment, the filter assembly 8 includes a filter cartridge and a filter screen. The filter cartridge is installed on the second circulation pipe 5, and the filter screen is detachably disposed inside the filter cartridge. This effectively intercepts impurities and particulate matter in the coolant 3, preventing them from entering the radiator 4 and ensuring the cleanliness of the cooling system. Regular replacement of the filter screen simplifies maintenance, ensures smooth circulation of the coolant 3, and further improves system stability and heat dissipation. The overall design balances efficiency and safety, significantly extending the equipment's service life.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be primarily defined by the scope of the claims.

Claims

1. A lithium-ion power battery system for a substation, characterized in that: Includes a cooling container (2), which is filled with coolant (3) and has a support structure (11) fixedly installed at the bottom. A battery module (1) is fixedly installed through the support structure (11), and a temperature control component (9) is installed on the battery module (1). The temperature control component (9) is used to monitor the temperature change of the battery module (1) in real time. A radiator (4) is fixedly installed on the top of the cooling container (2). The output end of the radiator (4) is connected to the cooling container (2) through a first circulation pipe, and the input end is provided with one end of a second circulation pipe (5). The other end of the second circulation pipe (5) is connected to the cooling container (2). A circulation pump (7), a valve (6), and a filter assembly (8) are provided on the second circulation pipe (5). The circulation pump (7) is used to drive the circulation flow of the coolant (3). The valve (6) is used to adjust the flow rate of the coolant (3). The filter assembly (8) is used to filter impurities in the coolant (3). The controller (10) is fixedly installed on the cooling container (2) and electrically connected to the circulating pump (7), valve (6) and temperature control component (9). The controller (10) is used to analyze and collect data from the temperature control component (9) and intelligently adjust the circulating pump (7) and valve (6) according to preset parameters. When the working temperature of the battery module (1) is lower than the safety threshold, the coolant (3) absorbs the heat of the battery module (1) and changes from liquid to gas through phase change. The gaseous coolant (3) is condensed into liquid coolant (3) by the radiator (4) and flows back to the cooling container (2) to complete the heat dissipation. When the operating temperature of the battery module (1) is higher than the safety threshold, the controller (10) adjusts the circulation pump (7) and the valve (6) to accelerate the circulation of the coolant (3) and quickly dissipate heat through the radiator (4) to ensure that the temperature of the battery module (1) is maintained within the safe range.

2. The substation lithium-ion power battery system according to claim 1, characterized in that: The battery module (1) is composed of multiple lithium-ion battery cells connected by wires. An insulating partition is provided between the lithium-ion battery cells, and the insulating partition has a high thermal conductivity.

3. A substation lithium-ion power battery system according to claim 2, characterized in that: The temperature control component (9) consists of multiple first temperature sensors and a temperature control acquisition chip; the first temperature sensor is attached to the lithium-ion battery cell and electrically connected to the input terminal of the temperature control acquisition chip, and the output terminal of the temperature control acquisition chip is electrically connected to the controller (10).

4. A substation lithium-ion power battery system according to claim 3, characterized in that: The temperature control component (9) also includes a third temperature sensor, which is disposed on the inner wall of the cooling container (2) and electrically connected to the input terminal of the temperature control acquisition chip, for collecting the working temperature change of the coolant (3).

5. A substation lithium-ion power battery system according to claim 1, characterized in that: The radiator (4) directly adopts a finned tube heat exchanger structure, which consists of multiple fins and pipes; a second temperature sensor, a flow regulating valve and a cooling fan (12) are also provided on the radiator (4), and the second temperature sensor, the flow regulating valve and the cooling fan (12) are electrically connected to the controller (10).

6. A substation lithium-ion power battery system according to claim 1, characterized in that: The cooling container (2) is made of high-strength, corrosion-resistant stainless steel, and the inner wall of the cooling container (2) is coated with a coating with high thermal conductivity.

7. A substation lithium-ion power battery system according to claim 1, characterized in that: The coolant (3) is a fluorinated liquid phase change coolant, and contains antioxidants and surfactants.

8. A substation lithium-ion power battery system according to claim 1, characterized in that: The filter assembly (8) includes a filter cartridge and a filter screen. The filter cartridge is installed on the second circulation pipe (5), and the filter screen is detachably installed inside the filter cartridge.

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