Liquid cooling energy storage container capable of monitoring service life of cooling liquid and regulating pressure and control method

Abstract

The invention discloses a liquid cooling energy storage container capable of monitoring the service life of cooling liquid and regulating pressure, which comprises a heat insulation container body, and a heat insulation wallboard is arranged on the left side of the heat insulation container body, and is characterized in that: liquid cooling battery modules are stacked on the right side of the heat insulation container body at intervals from bottom to top; a plurality of liquid-cooled battery modules stacked at intervals from bottom to top form a group, a plurality of groups of liquid-cooled battery modules are arranged on the right side of the heat-insulating container body at intervals, and a battery cluster is connected to the bottom of each liquid-cooled battery module; compared with the prior art, whether the cooling liquid goes bad and fails can be judged in real time, and timely replacement can be achieved; the volume change of cooling liquid in a system pipeline can be controlled, and the pressure can be automatically relieved and increased to normal operation pressure; small pressure drop can be automatically detected, and the pressure can be automatically supplemented and recovered to a normal operation pressure value; the cell temperature and the temperature difference are effectively controlled for a long time; the fault rate is low and the operation efficiency is high; and the maintenance frequency and the maintenance cost are low.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a liquid-cooled energy storage container for monitoring coolant life and pressure regulation and a control method thereof. Background Art

[0002] At present, energy issues have always been valued by the country, and carbon neutrality is a policy that the country is promoting. Therefore, energy storage containers have come into being. In the past one or two years, the huge market demand for the original air-cooled energy storage containers has shifted to the demand for liquid-cooled energy storage containers, and even the market demand for liquid-cooled energy storage containers will gradually surpass the market share of air-cooled energy storage containers. The current advantages of liquid-cooled energy storage containers are that they can be fully enclosed and dustproof, have low operating noise, and have high energy density. In particular, the temperature difference of liquid-cooled containers is extremely small, and a large amount of heat can be carried by the coolant for efficient heat exchange. Ensuring the rapid flow of the coolant depends on the stability of the system pressure of the coolant in the pipeline. How to ensure the life of the coolant and the stability of the system pressure is called the core technology of liquid-cooled energy storage containers.

[0003] Existing liquid-cooled energy storage containers cannot determine whether the coolant has deteriorated and become ineffective during long-term operation. When the climate temperature drops, the volume of coolant in the system pipeline becomes smaller, and the pressure drop triggers a low-pressure alarm, and the charging and discharging operation cannot continue. When the climate temperature rises, the volume of coolant in the system pipeline becomes larger, and the pressure increase triggers a high-pressure alarm, or the pipeline is broken by the pressure, and the charging and discharging operation cannot continue. When the liquid cooling system pipeline leaks, the pressure will be low, the battery cell is prone to high temperature, thermal runaway, and great safety hazards. The liquid-cooled energy storage container has a high failure rate in charging and discharging operation, low operating efficiency, high maintenance frequency, and high maintenance cost. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid-cooled energy storage container and a control method for monitoring the coolant life and pressure regulation, which can solve at least one of the above technical problems. The technical solution of the present invention is as follows:

[0005] A liquid-cooled energy storage container for monitoring coolant life and pressure regulation, comprising: an insulated container body, with an insulating wall panel arranged on the left side of the insulated container body, characterized in that:

[0006] Liquid-cooled battery modules are stacked from bottom to top on the right side of the heat-insulated container body, and each plurality of liquid-cooled battery modules stacked from bottom to top form a group. Multiple groups of liquid-cooled battery modules are arranged at intervals on the right side of the heat-insulated container body, and a battery cluster is connected to the bottom of each of the liquid-cooled battery modules;

[0007] A water cooling unit is arranged on the left side of the heat-insulating container body, a primary water outlet pipe is connected to the water outlet of the water cooling unit, and a primary water return pipe is connected to the water return outlet of the water cooling unit;

[0008] A circulation part, which is connected to the primary water outlet pipe and the primary water return pipe respectively, and is used to guide the coolant in the primary water outlet pipe to the battery cluster and guide the coolant heated by the battery cluster to the primary water return pipe;

[0009] A connecting part, which is connected and arranged between the liquid-cooled battery module and the circulation part, and is used to guide the cooling liquid heated by the liquid-cooled battery module to the circulation part;

[0010] pH intelligent monitoring system, which is installed on the first-level water outlet pipe and is used to detect the pH value of the coolant;

[0011] The high-sensitivity self-pressure regulator is connected between the water-cooling unit and the primary return pipe and is used to adjust the volume pressure of the coolant in the primary return pipe.

[0012] Furthermore, the circulation unit includes a secondary water inlet pipe connected to one side of each battery cluster, each of the secondary water inlet pipes is connected to the primary water outlet pipe, and multiple secondary water return pipes are connected to the primary water return pipe, and each of the secondary water return pipes is connected to the adjacent battery cluster.

[0013] Furthermore, the connecting part includes a three-level return pipe and a three-level water inlet pipe respectively connected to the left and right sides of each liquid-cooled battery module, each of the three-level return pipes is connected to the second-level return pipe, and each of the three-level water inlet pipes is connected to the second-level water inlet pipe.

[0014] Furthermore, the pH intelligent monitoring system includes a pH detector and a first anti-interference communication line. The pH detector is installed on the first-level water outlet pipe, and the first anti-interference communication line is connected to the liquid-cooled battery module.

[0015] Furthermore, the high-sensitivity self-pressure regulator includes a pressure regulator, a piston, a pressure spring, a second anti-interference communication line, a shell, a composite elastic membrane and an inert gas. The shell is connected and installed on the primary return pipe, and a booster gas nozzle is connected to the top of the shell. The piston cover is arranged on the booster gas nozzle, the pressure regulator is arranged above the piston, the pressure spring is arranged between the pressure regulator and the piston, the composite elastic membrane is arranged in the shell and covers the connecting end arranged at the bottom of the shell and the primary return pipe, the inert gas is arranged in the shell and on the outside of the composite elastic membrane, and the second anti-interference communication line is connected between the pressure regulator and the water cooling unit.

[0016] Furthermore, the following corrections are included:

[0017] Step 1: Define the values ​​of the liquid cooling container system, set the coolant temperature T, the maximum battery temperature Tmax, the system coolant pressure P, the initial coolant pH value pH1, and the coolant extreme temperatures of -40°C and 45°C.

[0018] Step 2: Power on the liquid-cooled container system, and the system confirms that the water-cooled unit, pH intelligent monitoring system, and high-sensitivity automatic voltage regulator are powered on and operating normally.

[0019] Step 3: The water-cooled unit and the high-sensitivity automatic voltage regulator collect the normal operating pressure value P1 of the system, the pH intelligent monitoring system collects the initial pH value pH1 of the coolant, the BMS of the liquid-cooled battery module collects the maximum temperature Tmax of the battery cell, and the water-cooled unit collects the coolant temperature T;

[0020] When T≤-45℃ or T≥45℃, the liquid cooling system stops charging and discharging;

[0021] When -40℃<T<25℃, the system pressure P<P1, the water-cooled unit sends out a low-pressure alarm signal, and the high-sensitivity self-voltage regulator detects the current real-time pressure value P. After receiving it, the BMS control system of the liquid-cooled battery module issues a boost command to the high-sensitivity self-voltage regulator to push the stored coolant pressure to the primary return pipe until P=P1, and the liquid-cooled container system is charged and discharged normally.

[0022] When 25℃<T<45℃, the system pressure P>P1, the water-cooled unit sends out a high-pressure alarm signal, the high-sensitivity self-voltage regulator detects the current real-time pressure value P, and the BMS control system of the liquid-cooled battery module issues a boost command to the high-sensitivity self-voltage regulator to release the pressure and store excess coolant until P=P1, and the liquid-cooled container system charges and discharges normally.

[0023] When T=25℃, the system pressure P=P1, and the liquid cooling container system charges and discharges normally.

[0024] When the liquid-cooled container system is normally charging and discharging, the pH intelligent monitoring system detects that pH is less than pH1 and the maximum battery temperature Tmax is less than 40°C, and the temperature growth rate is consistent with the big data growth rate, the liquid-cooled container system continues to charge and discharge normally.

[0025] When the liquid-cooled container system is normally charging and discharging, the pH intelligent monitoring system detects that the pH is less than pH1 and the maximum battery temperature Tmax is greater than 40°C, and the temperature growth rate is significantly increased compared with the big data growth rate, the pH value of the liquid-cooled container system sends an alarm signal, the coolant life expires and meets the termination replacement conditions, the liquid-cooled container is shut down and powered off to replace the new coolant. After the coolant is replaced, the liquid-cooled container system is powered on for normal charging and discharging.

[0026] In summary, the present invention has the following beneficial effects compared with the prior art:

[0027] The present invention provides a liquid-cooled energy storage container and a control method for monitoring the life of a coolant and regulating the pressure. During long-term operation, the liquid-cooled energy storage container can determine in real time whether the coolant has deteriorated and failed through a pH intelligent monitoring system, and can be replaced in time; when the climate temperature drops, the volume of the coolant in the system pipeline decreases, and the pressure of the high-sensitive self-pressure regulator drops and can automatically replenish the pressure to the normal operating pressure; when the climate temperature rises, the volume of the coolant in the system pipeline increases, and the pressure of the high-sensitive self-pressure regulator increases and can automatically release the pressure to the normal operating pressure; when leakage occurs in the liquid cooling system pipeline, the high-sensitive self-pressure regulator can automatically detect a slight drop in pressure and automatically replenish the pressure to restore the normal operating pressure value; the temperature and temperature difference of the battery core are effectively controlled for a long time; the liquid-cooled energy storage container has a low failure rate in charging and discharging operation and a high operating efficiency; the liquid-cooled energy storage container has a low maintenance frequency and a low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the present invention.

[0029] Figure 2 It is a bottom view schematic diagram of the present invention.

[0030] Figure 3 It is a separate schematic diagram of the high-sensitivity self-voltage regulator of the present invention.

[0031] Explanation of the accompanying drawings: 1. Insulated container body; 2. Insulated wall panel; 3. Liquid-cooled battery module; 4. Battery cluster; 5. Water-cooled unit; 6. Primary water outlet pipe; 7. Primary water return pipe; 8. Circulation unit; 10. pH intelligent monitoring system; 11. High-sensitivity automatic pressure regulator; 81. Secondary water inlet pipe; 82. Secondary water return pipe; 91. Third-level water return pipe; 92. Third-level water inlet pipe; 101. pH detector; 102. First anti-interference communication line; 111. Pressure regulator; 112. Piston; 113. Pressure spring; 114. Second anti-interference communication line; 115. Shell; 116. Composite elastic membrane; 117. Inert gas; 118. Booster nozzle. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] like Figures 1 to 3A liquid-cooled energy storage container for monitoring coolant life and pressure regulation is shown, comprising: an insulated container body 1, an insulating wall panel 2 is arranged at the left side of the insulated container body 1, and is characterized in that: a liquid-cooled battery module 3 is stacked from bottom to top on the right side of the insulated container body 1, and each plurality of liquid-cooled battery modules 3 stacked from bottom to top is a group, and a plurality of groups of liquid-cooled battery modules 3 are arranged at intervals on the right side of the insulated container body 1, and a battery cluster 4 is connected to the bottom of each liquid-cooled battery module 3; a water-cooling unit 5 is arranged on the left side of the insulated container body 1, and a primary water outlet pipe 6 is connected to the water outlet of the water-cooling unit 5, and a water return pipe 6 is connected to the water return pipe 6 of the water-cooling unit 5. A primary return pipe 7 is provided; a circulation part 8, which is respectively connected to the primary outlet pipe 6 and the primary return pipe 7, and is used to guide the coolant in the primary outlet pipe 6 to the battery cluster 4 and guide the coolant heated by the battery cluster 4 to the primary return pipe 7; a connecting part 9, which is connected and arranged between the liquid-cooled battery module 3 and the circulation part 8, and is used to guide the coolant heated by the liquid-cooled battery module 3 to the circulation part 8; a pH intelligent monitoring system 10, which is installed on the primary outlet pipe 6, and is used to detect the acidity and alkalinity of the coolant; a high-sensitivity self-voltage regulator 11, which is connected and arranged between the water-cooling unit 5 and the primary return pipe 7, and is used to adjust the volume pressure of the coolant in the primary return pipe 7.

[0034] The above structure is a liquid-cooled energy storage container for monitoring the life of the coolant and regulating the pressure. The liquid-cooled battery module 3 is a module-level unit module composed of other components such as battery cells, BMS control systems, and water-cooled plates. The liquid-cooled battery module 3 generates heat through charging and discharging. The heat is the object unit required to be cooled in this technical solution. The battery cluster 4 is a battery cluster 4 unit composed of multiple liquid-cooled battery modules 3 stacked together in the vertical direction. The primary water outlet pipe 6 is connected to the outlet of the water cooling unit 5, and the coolant of the water cooling unit 5 is directed to the inside of the liquid-cooled energy storage container. The primary return pipe 7 is connected to the return port of the water cooling unit 5, and guides the cooling liquid heated by the energy storage container to the water cooling unit 5. The circulation unit 8 guides the cooling liquid in the primary outlet pipe 6 to the battery cluster 4 and guides the cooling liquid heated by the battery cluster 4 to the primary return pipe 7. The connecting part 9 guides the cooling liquid heated by the liquid-cooled battery module 3 to the circulation unit 8. The pH intelligent monitoring system 10 detects the pH value of the pipeline in the liquid-cooled energy storage container and monitors the battery temperature of the system at the same time. The high-sensitivity self-voltage regulator 11 adjusts the pressure of the pipeline in the liquid-cooled energy storage container.

[0035] like Figure 1As shown, in some embodiments of the present invention, the circulation unit 8 includes a secondary water inlet pipe 81 connected to one side of each battery cluster 4, each of the secondary water inlet pipes 81 is connected to the primary water outlet pipe 6, and a plurality of secondary water return pipes 82 are connected to the primary water return pipe 7, each of the secondary water return pipes 82 is connected to the adjacent battery cluster 4, the secondary water return pipe 82 guides the cooling liquid after the battery cluster 4 is heated to the primary water return pipe 7, and the secondary water inlet pipe 81 guides the cooling liquid in the primary water outlet pipe 6 to the battery cluster.

[0036] like Figure 1 As shown, in some embodiments of the present invention, the connecting portion 9 includes a tertiary return pipe 91 and a tertiary water inlet pipe 92 respectively connected to the left and right sides of each liquid-cooled battery module 3, each of the tertiary return pipes 91 is connected to the secondary return pipe 82, each of the tertiary inlet pipes 92 is connected to the secondary inlet pipe 81, and the tertiary return pipe 91 is connected to the secondary inlet pipe 81 at one end and connected to the liquid-cooled battery module 3 at the other end. The tertiary return pipe 91 guides the cooling liquid heated by the liquid-cooled battery module 3 to the secondary return pipe 82.

[0037] like Figure 2 As shown, in some embodiments of the present invention, in order to achieve the effect of detecting the pH value of the coolant, the pH intelligent monitoring system 10 includes a pH detector 101 and a first anti-interference communication line 102. The pH detector 101 is installed on the first-level water outlet pipe 6, and the first anti-interference communication line 102 is connected to the liquid-cooled battery module 3.

[0038] When a liquid-cooled energy storage container using the above structure for monitoring coolant life and pressure regulation is in operation, the pH intelligent monitoring system is composed of a pH detector 101, an anti-interference communication line 102, and a pH controller (not shown in the attached figure), wherein the pH detector 101 is installed on the first-level water outlet pipe 6, directly and in real time detects the pH value of the coolant flowing through, and uploads the pH value to the pH controller losslessly through the anti-interference communication line 102. The pH controller is designed to be integrated with the display of the water cooling unit, and communicates with the water cooling unit 5 and the BMS (battery management system). The pH value is displayed in real time on the display of the container system, and the pH value is stored in the BMS, which can be downloaded and read. When the pH value reaches the preset pH value and the system battery temperature rises significantly, the pH value triggers an alarm to remind technicians to replace the coolant.

[0039] like Figure 3As shown, in some embodiments of the present invention, in order to achieve the effect of adjusting the volume pressure of the coolant in the primary return pipe 7, the high-sensitivity self-pressure regulator 11 includes a pressure regulator 111, a piston 112, a pressure spring 113, a second anti-interference communication line 114, a shell 115, a composite elastic film 116 and an inert gas 117. The shell 115 is connected and installed on the primary return pipe 7. A booster gas nozzle 118 is connected to the top of the shell 115. The piston 112 is covered on the booster gas nozzle 118. The pressure regulator 111 is arranged above the piston 112. The pressure spring 113 is arranged between the pressure regulator 111 and the piston 112. The composite elastic film 116 is arranged in the shell 115 and covers the connection end arranged at the bottom of the shell 115 and the primary return pipe 7. The inert gas 117 is arranged in the shell 115 and arranged on the outside of the composite elastic film 116. The second anti-interference communication line 114 is connected between the pressure regulator 111 and the water cooling unit 5.

[0040] When a liquid-cooled energy storage container using the above structure for monitoring coolant life and pressure regulation is in operation, the high-sensitivity self-pressure regulator is mainly composed of a pressure regulator 111, a piston 112, a pressure spring 113, an anti-interference communication line 114, a shell 115, a composite elastic film 116, and an inert gas 117. The pressure regulator 111 automatically sets the pressure relief or pressure increase through the principle of an electromagnetic valve, and can communicate with the BMS and the water cooling unit 5; the shell 115 is made of high-strength insulating composite heat-insulating material, can withstand 100 times the system pressure without deformation, and has good insulation, heat insulation and fireproof characteristics. The bottom is connected and fixed with the primary water outlet pipe 6, and a booster air nozzle 118 is opened on the top to amplify the pressure value and increase the pressure sensitivity; the pressure spring 113 is a component that executes the pressure command of the pressure regulator, and is made of a material with high elasticity and high strength; the piston 112 realizes the functions of sealing and pressure transmission, and the friction resistance of the sealing interface is extremely low; the composite material elastic membrane 116 is made of a composite material with high elasticity and high flexibility that is not deformed by temperature changes. The opening is fixed at the bottom of the shell 115 and is directly connected with the primary water outlet pipe 6, and the coolant can directly enter and exit the composite material elastic membrane 116. The inert gas 117 is sealed between the shell 115 and the composite elastic film 116. It is non-toxic, colorless, odorless, chemically stable, and has good compressibility. It is not affected by changes in density and volume due to temperature changes. It only transmits the expansion and contraction force of the composite elastic film 116, compresses the force of the composite elastic film 116 and transmits it to the booster nozzle 118, amplifies the pressure and transmits it to the piston 112, pushes the pressure spring trigger 113 to trigger the pressure regulator 111, and the pressure regulator 111 reads the pressure value, analyzes the actual pressure value of the system, and sends a pressure signal to the BMS. The water cooling unit 5 also sends the pressure value signal to the BMS. After confirmation, the BMS feeds back the pressure adjustment signal to the pressure regulator The device 111 performs a pressure regulating action. When the system pressure is greater than the system set value, the pressure of the inert gas 117 on the composite elastic membrane 116 is lower than the system pressure, and the coolant enters the composite elastic membrane 116. The composite elastic membrane 116 expands by its own high flexibility and elasticity to accommodate more coolant. The increased volume compresses the inert gas. The pressure regulator detects that the pressure value exceeds the set value. At the same time, the overpressure warning signal of the water cooling unit 5 is transmitted to the high-sensitivity self-pressure regulator 11 and the BMS. The BMS sends a pressure relief instruction to the pressure regulator 111 to reduce the compression force of the pressure spring 113 to the set pressure value, thereby relieving the pressure of the entire liquid cooling system and storing the excess coolant in the composite elastic membrane 116.

[0041] A control method for a liquid-cooled energy storage container for monitoring coolant life and pressure regulation, characterized by including the following corrections:

[0042] Step 1: Define the values ​​of the liquid cooling container system, set the coolant temperature T, the maximum battery temperature Tmax, the system coolant pressure P, the initial coolant pH value pH1, and the coolant extreme temperatures of -40°C and 45°C, where T is the coolant temperature, Tmax is the maximum temperature that the battery can withstand, pH1 is the acidity and alkalinity of the initial coolant, and P is the hydraulic pressure of the coolant.

[0043] Step 2: The liquid cooling container system is powered on, and the system confirms that the water cooling unit 5, the pH intelligent monitoring system 10, and the high-sensitivity automatic voltage regulator 11 are powered on and running normally.

[0044] Step 3: The water cooling unit 5 and the high-sensitivity self-voltage regulator 11 collect the normal operating pressure value P1 of the system, the pH intelligent monitoring system 10 collects the initial pH value pH1 of the coolant, the BMS of the liquid-cooled battery module 3 collects the maximum temperature Tmax of the battery cell, and the water cooling unit collects the coolant temperature T, wherein the pressure value P1 refers to the first pressure point or the initial pressure;

[0045] When T≤-45℃ or T≥45℃, the liquid cooling system stops charging and discharging;

[0046] When -40℃<T<25℃, the system pressure P<P1, the water cooling unit 5 sends out a low pressure alarm signal, and the high-sensitivity self-voltage regulator 11 detects the current real-time pressure value P. After receiving the signal, the BMS control system of the liquid-cooled battery module 3 issues a boost command to the high-sensitivity self-voltage regulator 11 to push the stored coolant pressure to the primary return pipe 7 until P=P1, and the liquid-cooled container system is charged and discharged normally.

[0047] When 25℃<T<45℃, the system pressure P>P1, the water-cooled unit 5 sends out a high-pressure alarm signal, the high-sensitivity self-voltage regulator detects the current real-time pressure value P, and the BMS control system of the liquid-cooled battery module 3 issues a boost command to the high-sensitivity self-voltage regulator 11 to release the pressure and store excess coolant until P=P1, and the liquid-cooled container system is charged and discharged normally.

[0048] When T=25℃, the system pressure P=P1, and the liquid cooling container system charges and discharges normally.

[0049] When the liquid-cooled container system is normally charging and discharging, the pH intelligent monitoring system 10 detects that pH is less than pH1 and the maximum battery temperature Tmax is less than 40°C, and the temperature growth rate is consistent with the big data growth rate, the liquid-cooled container system continues to charge and discharge normally.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation, comprising: A heat-insulating container body (1), wherein a heat-insulating wall panel (2) is provided on the left side of the heat-insulating container body (1), characterized in that: Liquid-cooled battery modules (3) are stacked from bottom to top at intervals on the right side of the heat-insulating container body (1), and each plurality of liquid-cooled battery modules (3) stacked from bottom to top at intervals form a group. Multiple groups of liquid-cooled battery modules (3) are arranged at intervals on the right side of the heat-insulating container body (1), and a battery cluster (4) is connected to the bottom of each of the liquid-cooled battery modules (3); A water cooling unit (5) is arranged on the left side of the heat-insulating container body (1), a primary water outlet pipe (6) is connected to the water outlet of the water cooling unit (5), and a primary water return pipe (7) is connected to the water return outlet of the water cooling unit (5); A circulation part (8) which is respectively connected to the primary water outlet pipe (6) and the primary water return pipe (7) and is used to guide the coolant in the primary water outlet pipe (6) to the battery cluster (4) and guide the coolant after heating the battery cluster (4) to the primary water return pipe (7); A connecting portion (9) is connected and arranged between the liquid-cooled battery module (3) and the circulation portion (8) and is used to guide the cooling liquid heated by the liquid-cooled battery module (3) to the circulation portion (8); A pH intelligent monitoring system (10) is installed on the primary water outlet pipe (6) and is used to detect the pH value of the coolant; A high-sensitivity self-pressure regulator (11) is connected and arranged between the water cooling unit (5) and the primary water return pipe (7) and is used to adjust the volume pressure of the cooling liquid in the primary water return pipe (7).

2. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation according to claim 1, characterized in that The circulation unit (8) comprises a secondary water inlet pipe (81) connected to one side of each battery cluster (4), each of the secondary water inlet pipes (81) being connected to a primary water outlet pipe (6), and a plurality of secondary water return pipes (82) being connected to the primary water return pipe (7), each of the secondary water return pipes (82) being connected to an adjacent battery cluster (4).

3. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation according to claim 2, characterized in that The connecting portion (9) comprises a tertiary water return pipe (91) and a tertiary water inlet pipe (92) respectively connected to the left and right sides of each liquid-cooled battery module (3); each of the tertiary water return pipes (91) is connected to the secondary water return pipe (82); and each of the tertiary water inlet pipes (92) is connected to the secondary water inlet pipe (81).

4. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation according to claim 3, characterized in that The pH intelligent monitoring system (10) comprises a pH detector (101) and a first anti-interference communication line (102); the pH detector (101) is installed on a primary water outlet pipe (6); and the first anti-interference communication line (102) is connected to a liquid-cooled battery module (3).

5. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation according to claim 4, characterized in that The high-sensitivity self-pressure regulator (11) comprises a pressure regulator (111), a piston (112), a pressure spring (113), a second anti-interference communication line (114), a shell (115), a composite elastic film (116) and an inert gas (117). The shell (115) is connected and installed on a primary water return pipe (7). A booster gas nozzle (118) is connected and connected to the top of the shell (115). The piston (112) is covered on the booster gas nozzle (118). The pressure regulator (111) is arranged on the piston. (112), the pressure spring (113) is arranged between the pressure regulator (111) and the piston (112), the composite elastic membrane (116) is arranged in the shell (115) and covers the connection end of the bottom of the shell (115) and the primary return pipe (7), the inert gas (117) is arranged in the shell (115) and arranged on the outside of the composite elastic membrane (116), and the second anti-interference communication line (114) is connected between the pressure regulator (111) and the water cooling unit (5).

6. A control method for a liquid-cooled energy storage container for monitoring coolant life and pressure regulation according to claim 5, characterized in that Including the following corrections: Step 1: Define the values ​​of the liquid cooling container system, set the coolant temperature T, the maximum battery temperature Tmax, the system coolant pressure P, the initial coolant pH value pH1, and the coolant extreme temperatures of -40°C and 45°C. Step 2: The liquid cooling container system is powered on, and the system confirms that the water cooling unit (5), the pH intelligent monitoring system (10), and the high-sensitivity automatic voltage regulator (11) are powered on and running normally. Step 3: The water cooling unit (5) and the high-sensitivity automatic voltage regulator (11) collect the normal operating pressure value P1 of the system, the pH intelligent monitoring system (10) collects the initial pH value pH1 of the coolant, the BMS of the liquid-cooled battery module (3) collects the maximum temperature Tmax of the battery cell, and the water cooling unit collects the coolant temperature T; When T≤-45℃ or T≥45℃, the liquid cooling system stops charging and discharging; When -40℃<T<25℃, the system pressure P<P1, the water cooling unit (5) sends a low pressure alarm signal, the high-sensitivity self-voltage regulator (11) detects the current real-time pressure value P, and the BMS control system of the liquid-cooled battery module (3) receives it and issues a pressure increase command to the high-sensitivity self-voltage regulator (11) to push the stored coolant pressure to the primary return pipe (7), until P=P1, the liquid-cooled container system is charged and discharged normally. When 25°C<T<45°C, the system pressure P>P1, the water cooling unit (5) sends a high-pressure alarm signal, the high-sensitivity self-voltage regulator detects the current real-time pressure value P, and the BMS control system of the liquid-cooled battery module (3) issues a boost command to the high-sensitivity self-voltage regulator (11) to release the pressure and store excess coolant until P=P1, and the liquid-cooled container system is charged and discharged normally. When T=25℃, the system pressure P=P1, and the liquid cooling container system charges and discharges normally. When the liquid-cooled container system is normally charged and discharged, the pH intelligent monitoring system detects (10) that pH is less than pH1 and the maximum battery temperature Tmax is less than 40°C, and the temperature growth rate is consistent with the big data growth rate, the liquid-cooled container system continues to charge and discharge normally. When the liquid-cooled container system is in normal charge and discharge process, the pH intelligent monitoring system (10) detects that the pH is less than pH1 and the maximum battery temperature Tmax is greater than 40°C, and the temperature growth rate is significantly increased compared with the big data growth rate, the pH value of the liquid-cooled container system sends an alarm signal, the coolant life expires and the replacement termination conditions are met, the liquid-cooled container is shut down and powered off to replace new coolant, and after the coolant is replaced, the liquid-cooled container system is powered on for normal charge and discharge.

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