Leakage liquid distribution detection and control method of liquid cooling energy storage system

Abstract

The invention relates to the field of liquid leakage detection, and discloses a liquid leakage distribution detection and control method for a liquid-cooled energy storage system, which comprises the following steps: firstly, carrying out pressure test and liquid level test in the liquid-cooled energy storage system, judging whether liquid leakage exists or not, and positioning the liquid leakage position; and finally, performing liquid leakage control on the liquid-cooled energy storage system based on the liquid leakage position, thereby realizing the purposes of liquid leakage distribution detection and control of the liquid-cooled energy storage system. According to the method, liquid leakage distribution detection and control of the liquid cooling energy storage system can be achieved, potential safety hazards can be found and processed in time, accidents are avoided, and the method ensures safe, stable and efficient operation of the system.

Description

Technical Field

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

[0002] The liquid-cooled energy storage system is a system that uses liquid as a cooling medium and removes the heat generated by the equipment through a circulating flow. In the energy storage system, 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. The liquid-cooled energy storage system is generally composed of coolant, liquid cooling plate, liquid cooling pump, liquid cooling pipe, condenser, evaporator, etc., and has the advantages of better heat dissipation, stability and reliability, and long service life. Because the liquid-cooled energy storage system involves a variety of metal and non-metal materials, such as copper, aluminum, stainless steel, EPDM rubber, etc. These materials may react chemically when in contact with the coolant, resulting in corrosion, swelling, etc., causing leakage. At the same time, when installing components such as liquid cooling pipes and liquid cooling plates, if the connection is not tight or there are defects, the coolant may seep out under pressure. In addition, loose or damaged pipe joints may also cause leakage.

[0003] Coolant leakage may cause safety accidents such as battery short circuit and fire, and will also have a serious impact on the performance of the liquid-cooled energy storage system. By real-time monitoring and controlling the leakage distribution, potential safety hazards can be discovered and dealt with in a timely manner to avoid accidents. Monitoring and controlling the leakage distribution of the leaking liquid-cooled energy storage system is an important measure to ensure the safe, stable and efficient operation of the system. By adopting advanced monitoring technology and control strategies, leakage problems can be discovered and dealt with in a timely manner to ensure the normal operation of the system and the stable performance of the equipment. Therefore, a leakage distribution detection and control method for a liquid-cooled energy storage system is proposed. Summary of the invention

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

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A first aspect of the present invention provides a method for detecting and controlling liquid leakage distribution of a liquid-cooled energy storage system, comprising the following steps: Performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; Perform leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine the target leakage position of the leaking liquid-cooled energy storage system; In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

[0006] Furthermore, in a preferred embodiment of the present invention, the pressure test and the liquid level test are performed in the liquid-cooled energy storage system, and based on the pressure test results and the liquid level test results, it is determined whether the liquid-cooled energy storage system is leaking, specifically: The liquid-cooled energy storage system that needs to be subjected to leakage analysis is calibrated as a target liquid-cooled energy storage system, wherein the target liquid-cooled energy storage system is composed of different system components, and the system components include a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump; Introducing a cooling system tester into the target liquid-cooled energy storage system, wherein the cooling system tester can perform a pressure test on the target liquid-cooled energy storage system and read a pressure reading in the target energy storage liquid cooling system; A pressure test time is preset, and during the pressure test time, the cooling system tester is controlled to apply pressure to the target liquid-cooled energy storage system and perform a pressure test, and at the same time, the pressure change rate of the target liquid-cooled energy storage system during the pressure test time is read in the cooling system tester; If the pressure change rate of the target liquid-cooled energy storage system within the pressure test time is greater than a preset value, 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 during the pressure test time is not greater than the preset value, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container, and the liquid level change rate of the liquid storage container is determined during the pressure test time by the rope-type liquid level change sensor; If the liquid level change rate of the liquid storage container is not greater than a preset value, the target liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If the liquid level change rate of the liquid storage container is greater than a preset value, the target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system.

[0007] Furthermore, in a preferred embodiment of the present invention, the leakage distribution position analysis is performed in the leakage liquid-cooled energy storage system to determine the target leakage position of the leakage liquid-cooled energy storage system, specifically: Obtaining an exit specification of the leaky liquid-cooled energy storage system, and determining key locations of different system components in the leaky liquid-cooled energy storage system based on the exit specification of the leaky liquid-cooled energy storage system; Positioning induction lines are laid out at key locations of different system components in the leaking liquid-cooled energy storage system, and positioning alarms are introduced, and the positioning induction lines are connected to the positioning alarms by electrical signals; Real-time monitoring of whether there is liquid contacting the positioning sensing line at the key positions of different system components in the leaking liquid-cooled energy storage system. If so, the key position of the corresponding system component is marked as the target leakage position, and an alarm signal is generated in the positioning alarm; If not, then obtaining the resistance components of different system components, calibrating them as system resistance components, and determining the positions of the different system resistance components in the leaky liquid-cooled energy storage system, calibrating them as system resistance component positions; Measure the real-time resistance values ​​of different system resistance components, and build a resistance distribution map of the leaky liquid-cooled energy storage system based on the corresponding system resistance component positions, which is calibrated as the system resistance distribution map; Based on the system resistance distribution map and combined with the gradient descent algorithm, the target leakage position of the leaking liquid-cooled energy storage system is calculated.

[0008] Further, in a preferred embodiment of the present invention, the target leakage position of the leaking liquid-cooled energy storage system is calculated based on the system resistance distribution map in combination with the gradient descent algorithm, specifically: Introduce leakage simulation software, and import the system resistance distribution map into the leakage simulation software, obtain a mathematical model that can simulate the leakage of the leakage liquid-cooled energy storage system, calibrate it as a leakage simulation model, obtain the simulated system resistance component according to the system resistance distribution map, and determine the distribution position of the simulated system resistance component; In the leakage simulation model, a gradient descent algorithm is introduced, and based on the gradient descent algorithm, objective functions of different simulated system resistance components are set, wherein the objective function of the simulated system resistance component is a resistance qualified threshold value of the simulated system resistance component; Running the leakage simulation model, and at the distribution position of the simulated system resistance component, based on the real-time resistance value of the simulated system resistance component and the resistance qualified threshold, calculating the gradient vector at the distribution position of the simulated system resistance component, and calibrating it as the initial gradient vector; In the gradient descent algorithm, an initial step size is preset, and an initial leakage position of the distribution position of the resistance component of the simulation system is preset, and based on the initial gradient vector and the initial step size, the initial leakage position of the distribution position of the resistance component of the simulation system is iteratively updated; The iterative update of the initial leakage position of the distribution position of the resistance component of the simulation system is to control the initial leakage position of the distribution position of the resistance component of the current simulation system to move one step in the opposite direction of the initial gradient vector, and the step length is equal to the initial step length; Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of iterative position updates 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 calibrated as the target leakage position.

[0009] Furthermore, in a preferred embodiment of the present invention, in the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system, specifically: Acquire a cut-off valve of the leaking liquid-cooled energy storage system, wherein the cut-off valve can isolate the target leakage location from a location in the leaking liquid-cooled energy storage system where no leakage exists, 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, a cut-off valve is started in the leaking liquid-cooled energy storage system to obtain a stopped leaking liquid-cooled energy storage system, which is calibrated as a stopped leaking liquid-cooled energy storage system; In the stopped leaking liquid-cooled energy storage system, cleaning the target leaking position until no alarm signal is generated in the positioning alarm, and controlling the stopped leaking liquid-cooled energy storage system to have no real-time leaking situation; The target leakage position is analyzed. If the target leakage position is only on the liquid storage container, the liquid storage container is calibrated as an abnormal liquid storage container. The liquid storage container whose liquid level change rate is not greater than the preset value is obtained and calibrated as a qualified liquid storage container. The abnormal liquid storage container is replaced by the qualified liquid storage container to obtain a qualified liquid-cooled energy storage system. If the target leakage position 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, the stopped leaking liquid-cooled energy storage system will be calibrated as a Class I leaking liquid-cooled energy storage system; In a type of leaking liquid-cooled energy storage system, the liquid cooling plate, annular distribution pipeline and coolant circulation pump are maintained airtight, and system leakage is controlled based on negative pressure cold plate liquid cooling technology.

[0010] 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 airtightly maintained, and the system leakage is controlled based on the negative pressure cold plate liquid cooling technology, specifically: In a liquid cooling plate, an annular distribution pipeline, and a coolant circulation pump of a leaking liquid-cooled energy storage system, respectively determining the location and size of respective target leakage locations; If the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump is a connection point, the sealing material is replaced in the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and after the sealing material is replaced, based on the cooling system tester, it is determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than a preset value within the pressure test time; If not, then a type of leaking liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If so, introduce negative pressure cold plate liquid cooling technology, and install a vacuum pump in a type of leaking liquid-cooled energy storage system, and provide negative pressure to the type of leaking liquid-cooled energy storage system through the vacuum pump and the coolant circulation pump, wherein the negative pressure can control the air pressure in the type of leaking liquid-cooled energy storage system to be lower than the ambient air pressure, so that the leaking liquid is sucked into the annular distribution pipeline and flows back into the liquid storage container; If after the introduction of negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system is still greater than the preset value within the pressure test time, it is necessary to replace the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and combine the negative pressure cold plate liquid cooling technology to obtain a qualified liquid-cooled energy storage system.

[0011] The second aspect of the present invention further provides a leakage distribution detection and control system for a liquid-cooled energy storage system, the control system comprising a memory and a processor, the memory storing a control method, and when the control method is executed by the processor, the following steps are implemented: Performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; Perform leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine the target leakage position of the leaking liquid-cooled energy storage system; In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

[0012] The present invention solves the technical defects existing in the background technology, and has the following beneficial effects: first, a pressure test and a liquid level test are performed in the liquid-cooled energy storage system to determine whether there is leakage and locate the leakage position, and finally, the liquid-cooled energy storage system is controlled for leakage based on the leakage position, so as to achieve the purpose of leakage distribution detection and control of the liquid-cooled energy storage system. The present invention can realize leakage distribution detection and control of the liquid-cooled energy storage system, can timely discover and deal with potential safety hazards, avoid accidents, and is a method to ensure the safe, stable and efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A flow chart showing a method for detecting and controlling liquid leakage distribution in a liquid-cooled energy storage system; Figure 2 The figure shows the flow chart of the release of leakage control for the leakage liquid-cooled energy storage system; Figure 3 A program view of a leakage distribution detection and control system for a liquid-cooled energy storage system is shown. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0017] Figure 1 A flow chart of a method for detecting and controlling liquid leakage distribution in a liquid-cooled energy storage system is shown, comprising the following steps: S102: performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; S104: performing a leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine a target leakage position of the leaking liquid-cooled energy storage system; S106: In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

[0018] Furthermore, in a preferred embodiment of the present invention, the pressure test and the liquid level test are performed in the liquid-cooled energy storage system, and based on the pressure test results and the liquid level test results, it is determined whether the liquid-cooled energy storage system is leaking, specifically: The liquid-cooled energy storage system that needs to be subjected to leakage analysis is calibrated as a target liquid-cooled energy storage system, wherein the target liquid-cooled energy storage system is composed of different system components, and the system components include a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump; Introducing a cooling system tester into the target liquid-cooled energy storage system, wherein the cooling system tester can perform a pressure test on the target liquid-cooled energy storage system and read a pressure reading in the target energy storage liquid cooling system; A pressure test time is preset, and during the pressure test time, the cooling system tester is controlled to apply pressure to the target liquid-cooled energy storage system and perform a pressure test, and at the same time, the pressure change rate of the target liquid-cooled energy storage system during the pressure test time is read in the cooling system tester; If the pressure change rate of the target liquid-cooled energy storage system within the pressure test time is greater than a preset value, 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 during the pressure test time is not greater than the preset value, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container, and the liquid level change rate of the liquid storage container is determined during the pressure test time by the rope-type liquid level change sensor; If the liquid level change rate of the liquid storage container is not greater than a preset value, the target liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If the liquid level change rate of the liquid storage container is greater than a preset value, the target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system.

[0019] It should be noted that in order to prevent leakage during the operation of the liquid-cooled energy storage system, which may trigger safety accidents such as battery short circuit and fire, it is necessary to detect the distribution of leakage in the liquid-cooled energy storage system and control it to ensure the safe and stable operation of the system. The liquid-cooled energy storage system is composed of multiple components, and different components may have leakage, so different components need to be detected for leakage. First, a pressure test is performed in the system, that is, an airtightness test. Air pressure is applied to the inside of the battery to make the system have pressure and observe the pressure change. If the pressure drops rapidly, that is, the pressure change rate is greater than the preset value, it indicates that the system may have a leak. The cooling system tester can be used to apply pressure and read the readings. If the pressure change rate is not greater than the preset value, it cannot be proved that there is no leakage in the system. The amount of coolant in the liquid storage container is dynamically balanced, that is, the liquid level is maintained within a certain range, because the coolant in the system flows back and forth to replenish, and there will be no leakage. If the liquid level is low, or the liquid level change rate is greater than the preset value, it proves that there is leakage, and a leaking liquid-cooled energy storage system is obtained.

[0020] Furthermore, in a preferred embodiment of the present invention, the leakage distribution position analysis is performed in the leakage liquid-cooled energy storage system to determine the target leakage position of the leakage liquid-cooled energy storage system, specifically: Obtaining an exit specification of the leaky liquid-cooled energy storage system, and determining key locations of different system components in the leaky liquid-cooled energy storage system based on the exit specification of the leaky liquid-cooled energy storage system; Positioning induction lines are laid out at key locations of different system components in the leaking liquid-cooled energy storage system, and positioning alarms are introduced, and the positioning induction lines are connected to the positioning alarms by electrical signals; Real-time monitoring of whether there is liquid contacting the positioning sensing line at the key positions of different system components in the leaking liquid-cooled energy storage system. If so, the key position of the corresponding system component is marked as the target leakage position, and an alarm signal is generated in the positioning alarm; If not, then obtaining the resistance components of different system components, calibrating them as system resistance components, and determining the positions of the different system resistance components in the leaky liquid-cooled energy storage system, calibrating them as system resistance component positions; Measure the real-time resistance values ​​of different system resistance components, and build a resistance distribution map of the leaky liquid-cooled energy storage system based on the corresponding system resistance component positions, which is calibrated as the system resistance distribution map; Based on the system resistance distribution map and combined with the gradient descent algorithm, the target leakage position of the leaking liquid-cooled energy storage system is calculated.

[0021] It should be noted that the positioning induction line is a kind of induction line that will output an alarm signal to the system if it touches the leaking liquid. When the positioning alarm sends out an alarm signal, it proves that there is a leak, and the positioning induction line is installed in different positions, so the leak position can be located according to the alarm signal. If the alarm signal is not generated, it may be that the leaking liquid does not touch the induction line, or there may be no induction line at the location of the leak. The location of the leak can be indicated by a resistance distribution map and a gradient descent method. The resistance distribution map is a distribution map of the position of the resistance component in the system.

[0022] Further, in a preferred embodiment of the present invention, the target leakage position of the leaking liquid-cooled energy storage system is calculated based on the system resistance distribution map in combination with the gradient descent algorithm, specifically: Introduce leakage simulation software, and import the system resistance distribution map into the leakage simulation software, obtain a mathematical model that can simulate the leakage of the leakage liquid-cooled energy storage system, calibrate it as a leakage simulation model, obtain the simulated system resistance component according to the system resistance distribution map, and determine the distribution position of the simulated system resistance component; In the leakage simulation model, a gradient descent algorithm is introduced, and based on the gradient descent algorithm, objective functions of different simulated system resistance components are set, wherein the objective function of the simulated system resistance component is a resistance qualified threshold value of the simulated system resistance component; Running the leakage simulation model, and at the distribution position of the simulated system resistance component, based on the real-time resistance value of the simulated system resistance component and the resistance qualified threshold, calculating the gradient vector at the distribution position of the simulated system resistance component, and calibrating it as the initial gradient vector; In the gradient descent algorithm, an initial step size is preset, and an initial leakage position of the distribution position of the resistance component of the simulation system is preset, and based on the initial gradient vector and the initial step size, the initial leakage position of the distribution position of the resistance component of the simulation system is iteratively updated; The iterative update of the initial leakage position of the distribution position of the resistance component of the simulation system is to control the initial leakage position of the distribution position of the resistance component of the current simulation system to move one step in the opposite direction of the initial gradient vector, and the step length is equal to the initial step length; Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of iterative position updates 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 calibrated as the target leakage position.

[0023] It should be noted that a mathematical model simulating leakage can be established through simulation software. This model should be able to reflect the impact of leakage on resistance distribution and how to locate the leakage point through resistance change. After building the leakage simulation model, the gradient descent method is an algorithm that combines the physical characteristics of the cooling system, the principle of resistance distribution and the idea of ​​algorithm optimization, and is used to accurately locate the leakage position. In the gradient descent method, an objective function needs to be set to evaluate the "goodness" of the current position. The objective function is the resistance qualified threshold of the resistance component of the simulation system. According to the objective function, combined with the current distribution position of the resistance component, the gradient vector can be calculated, and the gradient vector points to the direction where the objective function value decreases fastest. Use the gradient vector to update the current position. Specifically, it is to move the current position one step in the opposite direction of the gradient vector. The purpose of updating the position is to make the change of the objective function less than the preset threshold, so as to approach the real leakage point. When the number of iterations reaches the standard number, the target leakage position can be obtained.

[0024] Figure 2 The flowchart of the release of leakage control of the leaking liquid-cooled energy storage system is shown, including the following steps: S202: In the leaking liquid-cooled energy storage system, based on the target leakage position, controlling the leakage of the leaking liquid-cooled energy storage system to obtain a qualified liquid-cooled energy storage system; S204: In a leaking liquid-cooled energy storage system, perform airtight maintenance on the liquid cooling plate, annular distribution pipeline, and coolant circulation pump, and control system leakage based on negative pressure cold plate liquid cooling technology.

[0025] Furthermore, in a preferred embodiment of the present invention, in the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system, specifically: Acquire a cut-off valve of the leaking liquid-cooled energy storage system, wherein the cut-off valve can isolate the target leakage location from a location in the leaking liquid-cooled energy storage system where no leakage exists, 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, a cut-off valve is started in the leaking liquid-cooled energy storage system to obtain a stopped leaking liquid-cooled energy storage system, which is calibrated as a stopped leaking liquid-cooled energy storage system; In the stopped leaking liquid-cooled energy storage system, cleaning the target leaking position until no alarm signal is generated in the positioning alarm, and controlling the stopped leaking liquid-cooled energy storage system to have no real-time leaking situation; The target leakage position is analyzed. If the target leakage position is only on the liquid storage container, the liquid storage container is calibrated as an abnormal liquid storage container. The liquid storage container whose liquid level change rate is not greater than the preset value is obtained and calibrated as a qualified liquid storage container. The abnormal liquid storage container is replaced by the 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 annular distribution pipeline and the coolant circulation pump, the leaking liquid-cooled energy storage system that has stopped running will be calibrated as a Class I leaking liquid-cooled energy storage system.

[0026] It should be noted that when there is leakage in the system, that is, when a leak is detected, the shut-off valve should be activated immediately to isolate the leak from other locations in the system to prevent the leaked liquid from spreading further and reduce the scope of damage. After the shut-off valve is activated, the leak should be cleared immediately until no alarm signal is generated in the positioning alarm, that is, no leak contacts the positioning sensing line. The location of the leak may be on different components. If it only exists in the liquid storage container, it is judged that the liquid storage container is damaged or a large amount of coolant has overflowed. The liquid storage container needs to be replaced. After replacement, the system works normally. If there is leakage not only in the liquid storage container, it is judged that there is leakage in other places, and other solutions need to be adopted to control the leakage.

[0027] 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 airtightly maintained, and the system leakage is controlled based on the negative pressure cold plate liquid cooling technology, specifically: In a liquid cooling plate, an annular distribution pipeline, and a coolant circulation pump of a leaking liquid-cooled energy storage system, respectively determining the location and size of respective target leakage locations; If the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump is a connection point, the sealing material is replaced in the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and after the sealing material is replaced, based on the cooling system tester, it is determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than a preset value within the pressure test time; If not, then a type of leaking liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If so, introduce negative pressure cold plate liquid cooling technology, and install a vacuum pump in a type of leaking liquid-cooled energy storage system, and provide negative pressure to the type of leaking liquid-cooled energy storage system through the vacuum pump and the coolant circulation pump, wherein the negative pressure can control the air pressure in the type of leaking liquid-cooled energy storage system to be lower than the ambient air pressure, so that the leaking liquid is sucked into the annular distribution pipeline and flows back into the liquid storage container; If after the introduction of negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system is still greater than the preset value within the pressure test time, it is necessary to replace the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and combine the negative pressure cold plate liquid cooling technology to obtain a qualified liquid-cooled energy storage system.

[0028] It should be noted that in the liquid cooling plate, annular distribution pipeline and coolant circulation pump, better sealing materials can be used to achieve leakage control. For example, in the liquid cooling plate, reliable sealing structures such as O-rings, sealants, etc. can be used at the joints to ensure that the coolant does not leak from the joints. In the annular distribution pipeline, gaskets, sealants, etc. are used to improve the sealing performance of the joints; in the coolant circulation pump, advanced technologies such as mechanical seals or magnetic seals are used. If the pressure change rate of a type of leaking liquid-cooled energy storage system is still greater than the preset value after the pressure test is performed after sealing, it proves that the sealing effect is not good and other methods are needed to prevent leakage. Introducing negative pressure cold plate liquid cooling technology, 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 a vacuum pump and a liquid pump so that the liquid in the liquid cooling system will not leak near the components. When the system circuit is damaged, because the air pressure on both sides of the system is lower than the ambient air pressure, air will be sucked into the cooling pipeline and the liquid will flow back to the storage container, thus avoiding coolant leakage and obtaining a qualified liquid-cooled energy storage system.

[0029] like Figure 3 As shown, the second aspect of the present invention further provides a leakage distribution detection and control system for a liquid-cooled energy storage system, the control system comprising a memory 31 and a processor 32, the memory 31 stores a control method, and when the control method is executed by the processor 32, the following steps are implemented: Performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; Perform leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine the target leakage position of the leaking liquid-cooled energy storage system; In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

[0030] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for detecting and controlling leakage distribution of a liquid-cooled energy storage system, characterized in that: The following steps are involved: Performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; Perform leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine the target leakage position of the leaking liquid-cooled energy storage system; In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

2. According to the method for detecting and controlling leakage distribution of a liquid-cooled energy storage system as described in claim 1, it is characterized in that: The pressure test and the liquid level test are performed in the liquid-cooled energy storage system, and based on the pressure test results and the liquid level test results, it is determined whether the liquid-cooled energy storage system is leaking, specifically: The liquid-cooled energy storage system that needs to be subjected to leakage analysis is calibrated as a target liquid-cooled energy storage system, wherein the target liquid-cooled energy storage system is composed of different system components, and the system components include a liquid storage container, a liquid cooling plate, a ring distribution pipeline, and a coolant circulation pump; Introducing a cooling system tester into the target liquid-cooled energy storage system, wherein the cooling system tester can perform a pressure test on the target liquid-cooled energy storage system and read a pressure reading in the target energy storage liquid cooling system; A pressure test time is preset, and during the pressure test time, the cooling system tester is controlled to apply pressure to the target liquid-cooled energy storage system and perform a pressure test, and at the same time, the pressure change rate of the target liquid-cooled energy storage system during the pressure test time is read in the cooling system tester; If the pressure change rate of the target liquid-cooled energy storage system within the pressure test time is greater than a preset value, 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 during the pressure test time is not greater than the preset value, a rope-type liquid level change sensor is installed at the lowest point of the liquid storage container, and the liquid level change rate of the liquid storage container is determined during the pressure test time by the rope-type liquid level change sensor; If the liquid level change rate of the liquid storage container is not greater than the preset value, the target liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If the liquid level change rate of the liquid storage container is greater than a preset value, the target liquid-cooled energy storage system is calibrated as a leaking liquid-cooled energy storage system.

3. According to the method for detecting and controlling leakage distribution of a liquid-cooled energy storage system as described in claim 1, it is characterized in that: The leakage distribution position analysis is performed in the leakage liquid-cooled energy storage system to determine the target leakage position of the leakage liquid-cooled energy storage system, specifically: Obtaining an exit specification of the leaky liquid-cooled energy storage system, and determining key locations of different system components in the leaky liquid-cooled energy storage system based on the exit specification of the leaky liquid-cooled energy storage system; Positioning induction lines are laid out at key locations of different system components in the leaking liquid-cooled energy storage system, and positioning alarms are introduced, and the positioning induction lines are connected to the positioning alarms by electrical signals; Real-time monitoring of whether there is liquid contacting the positioning sensing line at the key positions of different system components in the leaking liquid-cooled energy storage system. If so, the key position of the corresponding system component is marked as the target leakage position, and an alarm signal is generated in the positioning alarm; If not, then obtaining the resistance components of different system components, calibrating them as system resistance components, and determining the positions of the different system resistance components in the leaky liquid-cooled energy storage system, calibrating them as system resistance component positions; Measure the real-time resistance values ​​of different system resistance components, and build a resistance distribution map of the leaky liquid-cooled energy storage system based on the corresponding system resistance component positions, which is calibrated as the system resistance distribution map; Based on the system resistance distribution map and combined with the gradient descent algorithm, the target leakage position of the leaking liquid-cooled energy storage system is calculated.

4. According to the method for detecting and controlling leakage distribution of a liquid-cooled energy storage system as described in claim 3, it is characterized in that: Based on the system resistance distribution map, combined with the gradient descent algorithm, the target leakage position of the leakage liquid-cooled energy storage system is calculated, specifically: Introduce leakage simulation software, and import the system resistance distribution map into the leakage simulation software, obtain a mathematical model that can simulate the leakage of the leakage liquid-cooled energy storage system, calibrate it as a leakage simulation model, obtain the simulated system resistance component according to the system resistance distribution map, and determine the distribution position of the simulated system resistance component; In the leakage simulation model, a gradient descent algorithm is introduced, and based on the gradient descent algorithm, objective functions of different simulated system resistance components are set, wherein the objective function of the simulated system resistance component is a resistance qualified threshold value of the simulated system resistance component; Running the leakage simulation model, and at the distribution position of the simulated system resistance component, based on the real-time resistance value of the simulated system resistance component and the resistance qualified threshold, calculating the gradient vector at the distribution position of the simulated system resistance component, and calibrating it as the initial gradient vector; In the gradient descent algorithm, an initial step size is preset, and an initial leakage position of the distribution position of the resistance component of the simulation system is preset, and based on the initial gradient vector and the initial step size, the initial leakage position of the distribution position of the resistance component of the simulation system is iteratively updated; The iterative update of the initial leakage position of the distribution position of the resistance component of the simulation system is to control the initial leakage position of the distribution position of the resistance component of the current simulation system to move one step in the opposite direction of the initial gradient vector, and the step length is equal to the initial step length; Repeat the process of calculating the gradient vector and updating the position, and preset the standard number of iterations. When the number of iterative position updates 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 calibrated as the target leakage position.

5. According to the method for detecting and controlling leakage distribution of a liquid-cooled energy storage system as described in claim 1, it is characterized in that: In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system, specifically: Acquire a cut-off valve of the leaking liquid-cooled energy storage system, wherein the cut-off valve can isolate the target leakage location from a location in the leaking liquid-cooled energy storage system where no leakage exists, 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, a cut-off valve is started in the leaking liquid-cooled energy storage system to obtain a stopped leaking liquid-cooled energy storage system, which is calibrated as a stopped leaking liquid-cooled energy storage system; In the stopped leaking liquid-cooled energy storage system, cleaning the target leaking position until no alarm signal is generated in the positioning alarm, and controlling the stopped leaking liquid-cooled energy storage system to have no real-time leaking situation; The target leakage position is analyzed. If the target leakage position is only on the liquid storage container, the liquid storage container is calibrated as an abnormal liquid storage container. The liquid storage container whose liquid level change rate is not greater than the preset value is obtained and calibrated as a qualified liquid storage container. The abnormal liquid storage container is replaced by the qualified liquid storage container to obtain a qualified liquid-cooled energy storage system. If the target leakage position 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, the stopped leaking liquid-cooled energy storage system will be calibrated as a Class I leaking liquid-cooled energy storage system; In a 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.

6. A method for detecting and controlling leakage distribution of a liquid-cooled energy storage system according to claim 5, characterized in that: In the first type of leaking liquid-cooled energy storage system, the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump are maintained airtight, and the system leakage is controlled based on the negative pressure cold plate liquid cooling technology, specifically: In a liquid cooling plate, an annular distribution pipeline, and a coolant circulation pump of a leaking liquid-cooled energy storage system, respectively determining the location and size of respective target leakage locations; If the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump is a connection point, the sealing material is replaced in the target leakage position in the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and after the sealing material is replaced, based on the cooling system tester, it is determined whether the pressure change rate of a type of leaking liquid-cooled energy storage system is greater than a preset value within the pressure test time; If not, then the type I leaking liquid-cooled energy storage system is calibrated as a qualified liquid-cooled energy storage system; If so, introduce negative pressure cold plate liquid cooling technology, and install a vacuum pump in a type of leaking liquid-cooled energy storage system, and provide negative pressure to the type of leaking liquid-cooled energy storage system through the vacuum pump and the coolant circulation pump, wherein the negative pressure can control the air pressure in the type of leaking liquid-cooled energy storage system to be lower than the ambient air pressure, so that the leaking liquid is sucked into the annular distribution pipeline and flows back into the liquid storage container; If after the introduction of negative pressure cold plate liquid cooling technology, the pressure change rate of a type of leaking liquid-cooled energy storage system is still greater than the preset value within the pressure test time, it is necessary to replace the liquid cooling plate, the annular distribution pipeline and the coolant circulation pump, and combine the negative pressure cold plate liquid cooling technology to obtain a qualified liquid-cooled energy storage system.

7. 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, wherein a control method program is stored in the memory. When the control method program is executed by the processor, the steps of a liquid leakage distribution detection and control method for a liquid-cooled energy storage system according to any one of claims 1 to 6 are implemented: Performing a pressure test and a liquid level test in the liquid-cooled energy storage system, and determining whether the liquid-cooled energy storage system is leaking based on the pressure test results and the liquid level test results; Perform leakage distribution position analysis in the leaking liquid-cooled energy storage system to determine the target leakage position of the leaking liquid-cooled energy storage system; In the leaking liquid-cooled energy storage system, based on the target leakage position, the leakage of the leaking liquid-cooled energy storage system is controlled to obtain a qualified liquid-cooled energy storage system.

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