A method for detecting and controlling leakage distribution in a liquid-cooled energy storage system

Abstract

This invention relates to the field of leakage detection and discloses a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system. The method includes the following steps: first, pressure and liquid level tests are performed within the liquid-cooled energy storage system to determine if leakage exists and locate the leak position; finally, leakage control is implemented based on the leak location, achieving the purpose of detecting and controlling leakage distribution in the liquid-cooled energy storage system. This invention enables the detection and control of leakage distribution in liquid-cooled energy storage systems, allowing for the timely discovery and handling of potential safety hazards, preventing accidents, and ensuring the safe, stable, and efficient operation of the system.

Description

Technical Field

[0001] This invention relates to the field of leakage detection, and in particular to a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system. Background Technology

[0002] A liquid-cooled energy storage system is a system that uses liquid as a cooling medium to remove heat generated by equipment through circulation. In energy storage systems, the main function of the liquid cooling system is to ensure the stable operation of core equipment such as batteries and improve energy utilization efficiency. A liquid-cooled energy storage system generally consists of coolant, liquid cooling plates, liquid cooling pumps, liquid cooling pipes, condensers, and evaporators, offering advantages such as better heat dissipation, stability, reliability, and long service life. Because liquid-cooled energy storage systems involve various metallic and non-metallic materials, such as copper, aluminum, stainless steel, and EPDM rubber, these materials may react chemically with the coolant, leading to corrosion, swelling, and leakage. Furthermore, if the connections of liquid cooling pipes and plates are not tight or have defects during installation, coolant may leak under pressure. In addition, loose or damaged pipe joints can also cause leakage.

[0003] Coolant leakage can lead to safety accidents such as battery short circuits and fires, and can also severely impact the performance of liquid-cooled energy storage systems. Real-time monitoring and control of leakage distribution can promptly identify and address potential safety hazards, preventing accidents. Monitoring and controlling leakage distribution in liquid-cooled energy storage systems is a crucial measure to ensure the safe, stable, and efficient operation of the system. By employing advanced monitoring technologies and control strategies, leakage problems can be detected and addressed promptly, ensuring the normal operation of the system and the stability of equipment performance. Therefore, a method for detecting and controlling leakage distribution in liquid-cooled energy storage systems is proposed. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The first aspect of this invention provides a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system, comprising the following steps:

[0007] Pressure and liquid level tests are performed within the liquid-cooled energy storage system, and the results of the pressure and liquid level tests are used to determine whether the liquid-cooled energy storage system is leaking.

[0008] In a liquid-cooled energy storage system with leakage, the location of leakage distribution is analyzed to determine the target leakage location.

[0009] In a liquid-cooled energy storage system with leakage, leakage control is performed based on the target leakage location to obtain a qualified liquid-cooled energy storage system.

[0010] Furthermore, in a preferred embodiment of the present invention, the step of performing pressure and liquid level tests within the liquid-cooled energy storage system, and determining whether leakage has occurred in the liquid-cooled energy storage system based on the pressure and liquid level test results, specifically involves:

[0011] The liquid-cooled energy storage system that needs to be analyzed for leakage is identified as the target liquid-cooled energy storage system. The target liquid-cooled energy storage system is composed of different system components, including a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump.

[0012] A cooling system tester is introduced into the target liquid-cooled energy storage system, wherein the cooling system tester can perform pressure tests on the target liquid-cooled energy storage system and read the pressure readings within the target liquid-cooled energy storage system;

[0013] The preset pressure test time is used to control the cooling system tester to apply pressure to the target liquid-cooled energy storage system and perform a pressure test during the pressure test time. At the same time, the pressure change rate of the target liquid-cooled energy storage system is read in the cooling system tester during the pressure test time.

[0014] If the pressure change rate of the target liquid-cooled energy storage system is greater than the preset value during the pressure test, it is determined that the target liquid-cooled energy storage system has leakage, and the corresponding target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system.

[0015] If the pressure change rate of the target liquid-cooled energy storage system does not exceed the preset value during the pressure test, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container. The liquid level change rate of the liquid storage container is determined by the rope-type liquid level change sensor during the pressure test.

[0016] If the rate of change of liquid level in the storage container is not greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system.

[0017] If the rate of change of liquid level in the storage container is greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a leaking liquid-cooled energy storage system.

[0018] Furthermore, in a preferred embodiment of the present invention, the step of analyzing the leakage distribution location in the leaking liquid-cooled energy storage system to determine the target leakage location of the leaking liquid-cooled energy storage system specifically involves:

[0019] Obtain the factory specification document of the leaking liquid-cooled energy storage system, and based on the factory specification document of the leaking liquid-cooled energy storage system, determine the key positions of different system components in the leaking liquid-cooled energy storage system;

[0020] In the liquid-cooled energy storage system with leakage, positioning sensor lines are laid at key locations of different system components, and positioning alarms are introduced. The positioning sensor lines are then connected to the positioning alarms via electrical signals.

[0021] Real-time monitoring of whether there is liquid contact positioning sensing line at key locations of different system components in the liquid-cooled energy storage system. If so, the key location of the corresponding system component is marked as the target leakage location, and an alarm signal is generated in the positioning alarm.

[0022] If not, obtain the resistor components of different system components, calibrate them as system resistor components, and determine the positions of different system resistor components in the leaking liquid-cooled energy storage system, calibrating them as system resistor component positions;

[0023] Measure the real-time resistance values ​​of different system resistor components, and combine them with the corresponding system resistor component locations to construct a resistance distribution map of the leaking liquid-cooled energy storage system, which is then calibrated as the system resistance distribution map.

[0024] Based on the system resistance distribution diagram and combined with the gradient descent algorithm, the target leakage location of the liquid-cooled energy storage system is calculated.

[0025] Furthermore, in a preferred embodiment of the present invention, the step of calculating the target leakage location of the liquid-cooled energy storage system based on the system resistance distribution map and combined with the gradient descent algorithm specifically involves:

[0026] A leakage simulation software was introduced, and the system resistance distribution diagram was imported into the leakage simulation software to obtain a mathematical model that can simulate the leakage situation of the liquid-cooled energy storage system. This model was calibrated as the leakage simulation model. Based on the system resistance distribution diagram, the resistance components of the simulated system were obtained, and the distribution location of the resistance components of the simulated system was determined.

[0027] In the leakage simulation model, a gradient descent algorithm is introduced. Based on the gradient descent algorithm, objective functions for different simulated system resistive components are set, wherein the objective function for the simulated system resistive component is the resistance qualification threshold of the simulated system resistive component.

[0028] Run the leakage simulation model, and at the distribution location of the resistor components in the simulation system, calculate the gradient vector at the distribution location of the resistor components in the simulation system based on the real-time resistance value and the resistance qualification threshold of the resistor components in the simulation system, and calibrate it as the initial gradient vector;

[0029] In the gradient descent algorithm, an initial step size is preset, and the initial leakage position of the distribution location of the resistor components in the simulated system is preset. Based on the initial gradient vector and combined with the initial step size, the initial leakage position of the distribution location of the resistor components in the simulated system is iteratively updated.

[0030] Specifically, the position iteration update of the initial position of leakage of the distribution location of the resistor component in the simulation system is to control the initial position of leakage of the current distribution location of the resistor component in the simulation system to move one step in the opposite direction of the initial gradient vector, and the step size is equal to the initial step size.

[0031] Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of position iterations is equal to the standard number of iterations, stop calculating the gradient vector and updating the position, and output the last updated leakage position, which is marked as the target leakage position.

[0032] Furthermore, in a preferred embodiment of the present invention, in the liquid-cooled energy storage system with leakage, based on the target leakage location, leakage control is performed on the liquid-cooled energy storage system with leakage to obtain a qualified liquid-cooled energy storage system, specifically as follows:

[0033] Obtain the shut-off valve of the leaking liquid-cooled energy storage system, wherein the shut-off valve can isolate the target leak location from the location in the leaking liquid-cooled energy storage system where there is no leak, and stop the operation of the leaking liquid-cooled energy storage system.

[0034] When the liquid-cooled energy storage system is a leaking liquid-cooled energy storage system, the shut-off valve is activated in the leaking liquid-cooled energy storage system to stop the operation of the leaking liquid-cooled energy storage system, and it is calibrated as a stopped leaking liquid-cooled energy storage system.

[0035] In the stopped liquid-cooled energy storage system, the target leakage location is cleaned up until no alarm signal is generated in the location alarm, and the stopped liquid-cooled energy storage system is controlled to stop the leakage and there is no real-time leakage.

[0036] The target leakage location is analyzed. If the target leakage location is only on the liquid storage container, the liquid storage container is marked as an abnormal liquid storage container. The liquid storage container with a liquid level change rate not greater than a preset value is marked as a qualified liquid storage container. The abnormal liquid storage container is replaced by a qualified liquid storage container to obtain a qualified liquid-cooled energy storage system.

[0037] If the target leakage location is not only on the liquid storage container, but also exists in the liquid cooling plate, the ring distribution pipeline and the coolant circulation pump, then the leaking liquid-cooled energy storage system will be shut down and classified as a Class I leaking liquid-cooled energy storage system.

[0038] In a type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump are maintained for airtightness, and system leakage is controlled based on negative pressure cold plate liquid cooling technology.

[0039] Furthermore, in a preferred embodiment of the present invention, in a type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump are maintained for airtightness, and system leakage is controlled based on negative pressure cold plate liquid cooling technology, specifically as follows:

[0040] In a type of leaking liquid-cooled energy storage system, the location and size of the target leak location are determined for the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump, respectively.

[0041] If the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump is a connection point, then the sealing material should be replaced at the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump. After the sealing material is replaced, based on the cooling system tester, it should be determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than the preset value within the pressure test time.

[0042] If not, then a type of leaking liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system;

[0043] If so, then negative pressure cold plate liquid cooling technology is introduced, and a vacuum pump is installed in a type of leaking liquid cooling energy storage system. Through the vacuum pump and the coolant circulation pump, negative pressure is provided to the type of leaking liquid cooling energy storage system. The negative pressure can control the gas pressure in the type of leaking liquid cooling energy storage system to be lower than the ambient gas pressure, so that the leaked liquid is sucked into the annular distribution pipeline and flows back to the storage container.

[0044] If, after introducing negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system still exceeds the preset value within the pressure test time, then the liquid cooling plate, annular distribution pipeline, and coolant circulation pump need to be replaced, and combined with negative pressure cold plate liquid cooling technology, a qualified liquid-cooled energy storage system can be obtained.

[0045] A second aspect of the present invention also provides a leakage distribution detection and control system for a liquid-cooled energy storage system. The control system includes a memory and a processor. The memory stores a control method, and when the control method is executed by the processor, it performs the following steps:

[0046] Pressure and liquid level tests are performed within the liquid-cooled energy storage system, and the results of the pressure and liquid level tests are used to determine whether the liquid-cooled energy storage system is leaking.

[0047] In a liquid-cooled energy storage system with leakage, the location of leakage distribution is analyzed to determine the target leakage location.

[0048] In a liquid-cooled energy storage system with leakage, leakage control is performed based on the target leakage location to obtain a qualified liquid-cooled energy storage system.

[0049] This invention addresses the technical deficiencies in the prior art and offers the following advantages: First, pressure and liquid level tests are performed within the liquid-cooled energy storage system to determine the presence and location of leaks. Finally, based on the leak location, leakage control is implemented in the liquid-cooled energy storage system, achieving the goal of leak distribution detection and control. This invention enables leak distribution detection and control in liquid-cooled energy storage systems, allowing for timely identification and handling of potential safety hazards, preventing accidents, and ensuring the safe, stable, and efficient operation of the system. Attached Figure Description

[0050] 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 only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0051] Figure 1 A flowchart of a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system is shown.

[0052] Figure 2 A flow chart for leakage control of a liquid-cooled energy storage system is shown.

[0053] Figure 3 A program view of a leakage distribution detection and control system for a liquid-cooled energy storage system is shown. Detailed Implementation

[0054] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0055] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0056] Figure 1 A flowchart of a method for detecting and controlling leakage distribution in a liquid-cooled energy storage system is shown, including the following steps:

[0057] S102: Perform pressure and liquid level tests within the liquid-cooled energy storage system, and determine whether the liquid-cooled energy storage system is leaking based on the pressure and liquid level test results.

[0058] S104: Analyze the leakage distribution location in the leakage liquid-cooled energy storage system to determine the target leakage location of the leakage liquid-cooled energy storage system.

[0059] S106: In a liquid-cooled energy storage system with leakage, based on the target leakage location, leakage control is performed on the liquid-cooled energy storage system with leakage to obtain a qualified liquid-cooled energy storage system.

[0060] Furthermore, in a preferred embodiment of the present invention, the step of performing pressure and liquid level tests within the liquid-cooled energy storage system, and determining whether leakage has occurred in the liquid-cooled energy storage system based on the pressure and liquid level test results, specifically involves:

[0061] The liquid-cooled energy storage system that needs to be analyzed for leakage is identified as the target liquid-cooled energy storage system. The target liquid-cooled energy storage system is composed of different system components, including a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump.

[0062] A cooling system tester is introduced into the target liquid-cooled energy storage system, wherein the cooling system tester can perform pressure tests on the target liquid-cooled energy storage system and read the pressure readings within the target liquid-cooled energy storage system;

[0063] The preset pressure test time is used to control the cooling system tester to apply pressure to the target liquid-cooled energy storage system and perform a pressure test during the pressure test time. At the same time, the pressure change rate of the target liquid-cooled energy storage system is read in the cooling system tester during the pressure test time.

[0064] If the pressure change rate of the target liquid-cooled energy storage system is greater than the preset value during the pressure test, it is determined that the target liquid-cooled energy storage system has leakage, and the corresponding target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system.

[0065] If the pressure change rate of the target liquid-cooled energy storage system does not exceed the preset value during the pressure test, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container. The liquid level change rate of the liquid storage container is determined by the rope-type liquid level change sensor during the pressure test.

[0066] If the rate of change of liquid level in the storage container is not greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system.

[0067] If the rate of change of liquid level in the storage container is greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a leaking liquid-cooled energy storage system.

[0068] It should be noted that to prevent leakage during the operation of the liquid-cooled energy storage system, which could lead to battery short circuits, fires, or other safety accidents, leakage distribution detection and control are necessary to ensure the system's safe and stable operation. The liquid-cooled energy storage system consists of multiple components, each of which may leak; therefore, leakage detection is required for each component. First, a pressure test, i.e., an airtightness test, is performed on the system. Air pressure is applied inside the battery to establish internal pressure, and pressure changes are observed. If the pressure drops rapidly, i.e., the rate of pressure change exceeds a preset value, it indicates a potential leak. A cooling system tester can be used to apply pressure and process the readings. If the rate of pressure change does not exceed the preset value, it does not necessarily mean there is no leak, as the amount of coolant in the storage container is dynamically balanced, meaning the liquid level is maintained within a certain range because the coolant is replenished through a reflux process, preventing leakage. If the liquid level is low, or the rate of liquid level change exceeds the preset value, it indicates a leak, revealing a leaking liquid-cooled energy storage system.

[0069] Furthermore, in a preferred embodiment of the present invention, the step of analyzing the leakage distribution location in the leaking liquid-cooled energy storage system to determine the target leakage location of the leaking liquid-cooled energy storage system specifically involves:

[0070] Obtain the factory specification document of the leaking liquid-cooled energy storage system, and based on the factory specification document of the leaking liquid-cooled energy storage system, determine the key positions of different system components in the leaking liquid-cooled energy storage system;

[0071] In the liquid-cooled energy storage system with leakage, positioning sensor lines are laid at key locations of different system components, and positioning alarms are introduced. The positioning sensor lines are then connected to the positioning alarms via electrical signals.

[0072] Real-time monitoring of whether there is liquid contact positioning sensing line at key locations of different system components in the liquid-cooled energy storage system. If so, the key location of the corresponding system component is marked as the target leakage location, and an alarm signal is generated in the positioning alarm.

[0073] If not, obtain the resistor components of different system components, calibrate them as system resistor components, and determine the positions of different system resistor components in the leaking liquid-cooled energy storage system, calibrating them as system resistor component positions;

[0074] Measure the real-time resistance values ​​of different system resistor components, and combine them with the corresponding system resistor component locations to construct a resistance distribution map of the leaking liquid-cooled energy storage system, which is then calibrated as the system resistance distribution map.

[0075] Based on the system resistance distribution diagram and combined with the gradient descent algorithm, the target leakage location of the liquid-cooled energy storage system is calculated.

[0076] It should be noted that the location sensor wire is a sensor wire that outputs an alarm signal to the system if it comes into contact with leaking liquid. When the location alarm sounds, it indicates a leak. Since the location sensor wires are installed in different locations, the leak location can be determined based on the alarm signal. If no alarm signal is generated, it may be that the leaking liquid has not come into contact with the sensor wire, or that there is no sensor wire at the leak location. The leak location can be indicated using a resistance distribution diagram and the gradient descent method. The resistance distribution diagram shows the distribution of the resistive components in the system.

[0077] Furthermore, in a preferred embodiment of the present invention, the step of calculating the target leakage location of the liquid-cooled energy storage system based on the system resistance distribution map and combined with the gradient descent algorithm specifically involves:

[0078] A leakage simulation software was introduced, and the system resistance distribution diagram was imported into the leakage simulation software to obtain a mathematical model that can simulate the leakage situation of the liquid-cooled energy storage system. This model was calibrated as the leakage simulation model. Based on the system resistance distribution diagram, the resistance components of the simulated system were obtained, and the distribution location of the resistance components of the simulated system was determined.

[0079] In the leakage simulation model, a gradient descent algorithm is introduced. Based on the gradient descent algorithm, objective functions for different simulated system resistive components are set, wherein the objective function for the simulated system resistive component is the resistance qualification threshold of the simulated system resistive component.

[0080] Run the leakage simulation model, and at the distribution location of the resistor components in the simulation system, calculate the gradient vector at the distribution location of the resistor components in the simulation system based on the real-time resistance value and the resistance qualification threshold of the resistor components in the simulation system, and calibrate it as the initial gradient vector;

[0081] In the gradient descent algorithm, an initial step size is preset, and the initial leakage position of the distribution location of the resistor components in the simulated system is preset. Based on the initial gradient vector and combined with the initial step size, the initial leakage position of the distribution location of the resistor components in the simulated system is iteratively updated.

[0082] Specifically, the position iteration update of the initial position of leakage of the distribution location of the resistor component in the simulation system is to control the initial position of leakage of the current distribution location of the resistor component in the simulation system to move one step in the opposite direction of the initial gradient vector, and the step size is equal to the initial step size.

[0083] Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of position iterations is equal to the standard number of iterations, stop calculating the gradient vector and updating the position, and output the last updated leakage position, which is marked as the target leakage position.

[0084] It should be noted that a mathematical model simulating leakage can be established using simulation software. This model should reflect the impact of leakage on the resistance distribution and how to locate the leakage point through resistance changes. After constructing the leakage simulation model, the gradient descent method, an algorithm combining the physical characteristics of the cooling system, the principle of resistance distribution, and algorithm optimization, is used to accurately locate the leakage position. In the gradient descent method, an objective function needs to be set to evaluate the "quality" of the current position. The objective function is the acceptable resistance threshold of the resistor components in the simulated system. Based on the objective function and the current distribution position of the resistor components, a gradient vector can be calculated. The gradient vector points in the direction of the fastest decrease in the objective function value. The gradient vector is used to update the current position. Specifically, the current position is moved one step in the opposite direction of the gradient vector. The goal of updating the position is to make the change in the objective function less than a preset threshold, thus approaching the actual leakage point. When the number of iterations reaches a standard number, the target leakage location is obtained.

[0085] Figure 2 The flowchart for leak control in a liquid-cooled energy storage system is shown, including the following steps:

[0086] S202: In a liquid-cooled energy storage system with leakage, based on the target leakage location, the system is controlled to obtain a qualified liquid-cooled energy storage system.

[0087] S204: In a type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump are kept airtight, and system leakage is controlled based on negative pressure cold plate liquid cooling technology.

[0088] Furthermore, in a preferred embodiment of the present invention, in the liquid-cooled energy storage system with leakage, based on the target leakage location, leakage control is performed on the liquid-cooled energy storage system with leakage to obtain a qualified liquid-cooled energy storage system, specifically as follows:

[0089] Obtain the shut-off valve of the leaking liquid-cooled energy storage system, wherein the shut-off valve can isolate the target leak location from the location in the leaking liquid-cooled energy storage system where there is no leak, and stop the operation of the leaking liquid-cooled energy storage system.

[0090] When the liquid-cooled energy storage system is a leaking liquid-cooled energy storage system, the shut-off valve is activated in the leaking liquid-cooled energy storage system to stop the operation of the leaking liquid-cooled energy storage system, and it is calibrated as a stopped leaking liquid-cooled energy storage system.

[0091] In the stopped liquid-cooled energy storage system, the target leakage location is cleaned up until no alarm signal is generated in the location alarm, and the stopped liquid-cooled energy storage system is controlled to stop the leakage and there is no real-time leakage.

[0092] The target leakage location is analyzed. If the target leakage location is only on the liquid storage container, the liquid storage container is marked as an abnormal liquid storage container. The liquid storage container with a liquid level change rate not greater than a preset value is marked as a qualified liquid storage container. The abnormal liquid storage container is replaced by a qualified liquid storage container to obtain a qualified liquid-cooled energy storage system.

[0093] If the target leakage location is not only on the liquid storage container, but also exists in the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump, then the leaking liquid-cooled energy storage system will be classified as a Class I leaking liquid-cooled energy storage system.

[0094] It should be noted that when a leak is detected in the system, the shut-off valve should be activated immediately to isolate the leak from other parts of the system, preventing further spread of the leaked liquid and minimizing the damage. After activating the shut-off valve, immediately clean up the leak until the location alarm no longer generates an alarm signal, indicating that no liquid has contacted the location sensor wire. The leak may be located on different components. If it is only in the reservoir, it indicates that the reservoir is damaged or that too much coolant has overflowed, and the reservoir needs to be replaced. After replacement, the system will function normally. If the leak is not only in the reservoir, it indicates that there is a leak elsewhere, and other leak control measures need to be taken.

[0095] Furthermore, in a preferred embodiment of the present invention, in a type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump are maintained for airtightness, and system leakage is controlled based on negative pressure cold plate liquid cooling technology, specifically as follows:

[0096] In a type of leaking liquid-cooled energy storage system, the location and size of the target leak location are determined for the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump, respectively.

[0097] If the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump is a connection point, then the sealing material should be replaced at the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump. After the sealing material is replaced, based on the cooling system tester, it should be determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than the preset value within the pressure test time.

[0098] If not, then a type of leaking liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system;

[0099] If so, then negative pressure cold plate liquid cooling technology is introduced, and a vacuum pump is installed in a type of leaking liquid cooling energy storage system. Through the vacuum pump and the coolant circulation pump, negative pressure is provided to the type of leaking liquid cooling energy storage system. The negative pressure can control the gas pressure in the type of leaking liquid cooling energy storage system to be lower than the ambient gas pressure, so that the leaked liquid is sucked into the annular distribution pipeline and flows back to the storage container.

[0100] If, after introducing negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system still exceeds the preset value within the pressure test time, then the liquid cooling plate, annular distribution pipeline, and coolant circulation pump need to be replaced, and combined with negative pressure cold plate liquid cooling technology, a qualified liquid-cooled energy storage system can be obtained.

[0101] It should be noted that better sealing materials can be used in the liquid cooling plate, annular distribution piping, and coolant circulation pump to control leakage. For example, in the liquid cooling plate, reliable sealing structures such as O-rings and sealants can be used at the joints to ensure that coolant does not leak from the joints. In the annular distribution piping, gaskets and sealants are used to improve the sealing performance at the joints; and advanced technologies such as mechanical seals or magnetic seals are used in the coolant circulation pump. If, after sealing, a pressure test is conducted and the pressure change rate of a leaking liquid-cooled energy storage system still exceeds the preset value, it proves that the sealing effect is poor and other methods are needed to prevent leakage. The introduction of negative pressure cold plate liquid cooling technology is an advanced liquid cooling technology that effectively reduces the risk of coolant leakage by maintaining a negative pressure state inside the liquid cooling system. This technology provides negative pressure through vacuum pumps and liquid pumps, preventing liquid from leaking near the components. When a circuit failure occurs in the system, because the pressure on both sides of the system is lower than the ambient air pressure, air will be drawn into the cooling pipes, and the liquid will flow back to the storage container, thus preventing coolant leakage and obtaining a qualified liquid-cooled energy storage system.

[0102] like Figure 3 As shown, a second aspect of the present invention also provides a leakage distribution detection and control system for a liquid-cooled energy storage system. The control system includes a memory 31 and a processor 32. The memory 31 stores a control method. When the control method is executed by the processor 32, it performs the following steps:

[0103] Pressure and liquid level tests are performed within the liquid-cooled energy storage system, and the results of the pressure and liquid level tests are used to determine whether the liquid-cooled energy storage system is leaking.

[0104] In a liquid-cooled energy storage system with leakage, the location of leakage distribution is analyzed to determine the target leakage location.

[0105] In a liquid-cooled energy storage system with leakage, leakage control is performed based on the target leakage location to obtain a qualified liquid-cooled energy storage system.

[0106] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for detecting and controlling leakage distribution in a liquid-cooled energy storage system, characterized in that, Includes the following steps: Pressure and liquid level tests are performed within the liquid-cooled energy storage system, and the results of the pressure and liquid level tests are used to determine whether the liquid-cooled energy storage system is leaking. In a liquid-cooled energy storage system with leakage, the location of leakage distribution is analyzed to determine the target leakage location. In a liquid-cooled energy storage system with leakage, leakage control is performed based on the target leakage location to obtain a qualified liquid-cooled energy storage system. Specifically, the step of analyzing the leakage distribution location in the liquid-cooled energy storage system to determine the target leakage location of the system involves: Obtain the factory specification document of the leaking liquid-cooled energy storage system, and based on the factory specification document of the leaking liquid-cooled energy storage system, determine the key positions of different system components in the leaking liquid-cooled energy storage system; Positioning sensor lines are laid at key locations of different system components in the leaking liquid-cooled energy storage system, and positioning alarms are introduced. The positioning sensor lines are then connected to the positioning alarms via electrical signals. Real-time monitoring of whether there is liquid contact positioning sensing line at key locations of different system components in the liquid-cooled energy storage system. If so, the key location of the corresponding system component is marked as the target leakage location, and an alarm signal is generated in the positioning alarm. If not, obtain the resistor components of different system components, calibrate them as system resistor components, and determine the positions of different system resistor components in the leaking liquid-cooled energy storage system, calibrating them as system resistor component positions; Measure the real-time resistance values ​​of different system resistor components, and combine them with the corresponding system resistor component locations to construct a resistance distribution map of the leaking liquid-cooled energy storage system, which is then calibrated as the system resistance distribution map. Based on the system resistance distribution map and combined with the gradient descent algorithm, the target leakage location of the liquid-cooled energy storage system is calculated, specifically: A leakage simulation software was introduced, and the system resistance distribution diagram was imported into the leakage simulation software to obtain a mathematical model that can simulate the leakage situation of the liquid-cooled energy storage system. This model was calibrated as the leakage simulation model. Based on the system resistance distribution diagram, the resistance components of the simulated system were obtained, and the distribution location of the resistance components of the simulated system was determined. In the leakage simulation model, a gradient descent algorithm is introduced. Based on the gradient descent algorithm, objective functions for different simulated system resistive components are set, wherein the objective function for the simulated system resistive component is the resistance qualification threshold of the simulated system resistive component. Run the leakage simulation model, and at the distribution location of the resistor components in the simulation system, calculate the gradient vector at the distribution location of the resistor components in the simulation system based on the real-time resistance value and the resistance qualification threshold of the resistor components in the simulation system, and calibrate it as the initial gradient vector; In the gradient descent algorithm, an initial step size is preset, and the initial leakage position of the distribution location of the resistor components in the simulated system is preset. Based on the initial gradient vector and combined with the initial step size, the initial leakage position of the distribution location of the resistor components in the simulated system is iteratively updated. Specifically, the position iteration update of the initial position of leakage of the distribution location of the resistor component in the simulation system is to control the initial position of leakage of the current distribution location of the resistor component in the simulation system to move one step in the opposite direction of the initial gradient vector, and the step size is equal to the initial step size. Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of position iterations is equal to the standard number of iterations, stop calculating the gradient vector and updating the position, and output the last updated leakage position, which is marked as the target leakage position.

2. The method for detecting and controlling leakage distribution in a liquid-cooled energy storage system according to claim 1, characterized in that, The process of performing pressure and liquid level tests within the liquid-cooled energy storage system, and determining whether leakage has occurred based on the pressure and liquid level test results, specifically involves: The liquid-cooled energy storage system that needs to be analyzed for leakage is identified as the target liquid-cooled energy storage system. The target liquid-cooled energy storage system is composed of different system components, including a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump. A cooling system tester is introduced into the target liquid-cooled energy storage system, wherein the cooling system tester can perform pressure tests on the target liquid-cooled energy storage system and read the pressure readings within the target liquid-cooled energy storage system; The preset pressure test time is used to control the cooling system tester to apply pressure to the target liquid-cooled energy storage system and perform a pressure test during the pressure test time. At the same time, the pressure change rate of the target liquid-cooled energy storage system is read in the cooling system tester during the pressure test time. If the pressure change rate of the target liquid-cooled energy storage system is greater than the preset value during the pressure test, it is determined that the target liquid-cooled energy storage system has leakage, and the corresponding target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system. If the pressure change rate of the target liquid-cooled energy storage system does not exceed the preset value during the pressure test, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container. The liquid level change rate of the liquid storage container is determined by the rope-type liquid level change sensor during the pressure test. If the rate of change of liquid level in the storage container is not greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system. If the rate of change of liquid level in the storage container is greater than the preset value, the target liquid-cooled energy storage system will be calibrated as a leaking liquid-cooled energy storage system.

3. The method for detecting and controlling leakage distribution in a liquid-cooled energy storage system according to claim 1, characterized in that, In the aforementioned liquid-cooled energy storage system with leakage, based on the target leakage location, leakage control is performed to obtain a qualified liquid-cooled energy storage system. Specifically: Obtain the shut-off valve of the leaking liquid-cooled energy storage system, wherein the shut-off valve can isolate the target leak location from the location in the leaking liquid-cooled energy storage system where there is no leak, and stop the operation of the leaking liquid-cooled energy storage system. When the liquid-cooled energy storage system is a leaking liquid-cooled energy storage system, the shut-off valve is activated in the leaking liquid-cooled energy storage system to stop the operation of the leaking liquid-cooled energy storage system, and it is calibrated as a stopped leaking liquid-cooled energy storage system. In the stopped liquid-cooled energy storage system, the target leakage location is cleaned up until no alarm signal is generated in the location alarm, and the stopped liquid-cooled energy storage system is controlled to stop the leakage and there is no real-time leakage. The target leakage location is analyzed. If the target leakage location is only on the liquid storage container, the liquid storage container is marked as an abnormal liquid storage container. The liquid storage container with a liquid level change rate not greater than a preset value is marked as a qualified liquid storage container. The abnormal liquid storage container is replaced by a qualified liquid storage container to obtain a qualified liquid-cooled energy storage system. If the target leakage location is not only on the liquid storage container, but also exists in the liquid cooling plate, the ring distribution pipeline and the coolant circulation pump, then the leaking liquid-cooled energy storage system will be shut down and classified as a Class I leaking liquid-cooled energy storage system. In a type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump are maintained for airtightness, and system leakage is controlled based on negative pressure cold plate liquid cooling technology.

4. The method for detecting and controlling leakage distribution in a liquid-cooled energy storage system according to claim 3, characterized in that, In the aforementioned type of leaking liquid-cooled energy storage system, the liquid cooling plate, annular distribution pipeline, and coolant circulation pump are maintained in a sealed manner, and system leakage is controlled based on negative pressure cold plate liquid cooling technology, specifically: In a type of leaking liquid-cooled energy storage system, the location and size of the target leak location are determined for the liquid cooling plate, the annular distribution pipeline, and the coolant circulation pump, respectively. If the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump is a connection point, then the sealing material should be replaced at the target leakage location in the liquid cooling plate, the ring distribution pipe, and the coolant circulation pump. After the sealing material is replaced, based on the cooling system tester, it should be determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than the preset value within the pressure test time. If not, then a type of leaking liquid-cooled energy storage system will be calibrated as a qualified liquid-cooled energy storage system; If so, then negative pressure cold plate liquid cooling technology is introduced, and a vacuum pump is installed in a type of leaking liquid cooling energy storage system. Through the vacuum pump and the coolant circulation pump, negative pressure is provided to the type of leaking liquid cooling energy storage system. The negative pressure can control the gas pressure in the type of leaking liquid cooling energy storage system to be lower than the ambient gas pressure, so that the leaked liquid is sucked into the annular distribution pipeline and flows back to the storage container. If, after introducing negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system still exceeds the preset value within the pressure test time, then the liquid cooling plate, annular distribution pipeline, and coolant circulation pump need to be replaced, and combined with negative pressure cold plate liquid cooling technology, a qualified liquid-cooled energy storage system can be obtained.

5. A leakage distribution detection and control system for a liquid-cooled energy storage system, characterized in that, The control system includes a memory and a processor. The memory stores a control method program. When the control method program is executed by the processor, it implements the steps of the leakage distribution detection and control method for a liquid-cooled energy storage system as described in any one of claims 1-4.

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