Liquid-cooled energy storage container and control method for monitoring coolant life and pressure regulation

Abstract

The application discloses a liquid-cooled energy storage container for monitoring the service life and pressure regulation of cooling liquid, comprising: a heat-insulating container body, a heat-insulating wall plate being arranged on the left side of the heat-insulating container body, characterized in that: liquid-cooled battery modules are stacked on the right side of the heat-insulating container body from bottom to top, a plurality of liquid-cooled battery modules stacked 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, and a battery cluster is connected to the bottom of each liquid-cooled battery module. Compared with the prior art, the liquid-cooled energy storage container can judge whether the cooling liquid is deteriorated and invalid in real time, can be replaced in time, can control the volume change of the cooling liquid in the system pipeline, and can automatically detect a slight decrease in pressure and automatically compensate the pressure to recover to a normal operating pressure value. The battery cell temperature and temperature difference are effectively controlled for a long time. The liquid-cooled energy storage container has low failure rate, high operation efficiency, low maintenance frequency and low maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a liquid-cooled energy storage container for monitoring the service life of cooling liquid and pressure regulation and a control method. BACKGROUND

[0002] At present, energy problems have always been valued by the country, and carbon neutralization is a policy promoted by the country, so energy storage containers have emerged as the times require. In the past two years, the huge demand for the original air-cooled energy storage container in the market has shifted to the demand for liquid-cooled energy storage containers. Even the market demand for liquid-cooled energy storage containers will gradually exceed the market share of air-cooled energy storage containers. At present, the advantages of liquid-cooled energy storage containers mainly include full-closed dustproof, low operating noise, high energy density, and especially small temperature difference of liquid-cooled containers, which can carry a large amount of heat through cooling liquid for efficient heat exchange, and the stability of the system pressure of the cooling liquid in the pipeline determines the rapid flow of the cooling liquid. How to ensure the service life of the cooling liquid and the stability of the system pressure is the core technology of the liquid-cooled energy storage container.

[0003] The existing liquid-cooled energy storage container cannot determine whether the cooling liquid is deteriorated and invalid in long-term operation. When the climate temperature drops, the volume of the cooling liquid in the system pipeline decreases, the pressure drops, and a low-pressure alarm is triggered, so that the charging and discharging operation cannot continue. When the climate temperature rises, the volume of the cooling liquid in the system pipeline increases, the pressure increases, a high-pressure alarm is triggered, or the pipeline is broken by the pressure, so that the charging and discharging operation cannot continue. When the liquid cooling system pipeline leaks, the pressure is low, the battery cells are prone to high temperature, thermal runaway occurs, and the safety risk is large. The liquid-cooled energy storage container has a high failure rate in charging and discharging operation, low operation efficiency, high maintenance frequency, and high maintenance cost. SUMMARY

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

[0005] A liquid-cooled energy storage container for monitoring the service life of cooling liquid and pressure regulation, comprising: a heat-insulating container body, a heat-insulating wall plate is arranged on the left side of the heat-insulating container body:

[0006] A liquid-cooled battery module is stacked on the right side of the heat-insulating container body from bottom to top, each of the plurality of liquid-cooled battery modules stacked from bottom to top is a group, and a plurality of groups of liquid-cooled battery modules are arranged on the right side of the heat-insulating container body, and a battery cluster is connected at the bottom of each liquid-cooled battery module;

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

[0008] a circulation part connected with the first outlet pipe and the first return pipe respectively, for guiding the cooling liquid in the first outlet pipe to the battery cluster and guiding the heated cooling liquid from the battery cluster to the first return pipe;

[0009] a connecting part connected between the liquid-cooled battery module and the circulation part, for guiding the heated cooling liquid from the liquid-cooled battery module to the circulation part;

[0010] a pH intelligent monitoring system installed on the first outlet pipe, for detecting the pH value of the cooling liquid;

[0011] a high-sensitivity self-regulating pressure device connected between the water cooling unit and the first return pipe, for regulating the volume pressure of the cooling liquid in the first return pipe, the high-sensitivity self-regulating pressure device comprising a pressure regulator, a piston, a pressure spring, a second anti-interference communication line, a shell, a composite elastic membrane and inert gas, the shell being connected and installed on the first return pipe, a pressure-increasing nozzle being provided on the top of the shell, the piston cover being provided on the pressure-increasing nozzle, the pressure regulator being provided above the piston, the pressure spring being provided between the pressure regulator and the piston, the composite elastic membrane being provided in the shell and covering the connecting end of the shell bottom and the first return pipe, the inert gas being provided in the shell and outside the composite elastic membrane, and the second anti-interference communication line being connected between the pressure regulator and the water cooling unit.

[0012] Further, the circulation part comprises second inlet pipes connected on the side of each battery cluster, each of the second inlet pipes being communicated with the first outlet pipe, and a plurality of second return pipes being provided on the first return pipe and connected with the adjacent battery cluster.

[0013] Further, the connecting part comprises third return pipes and third inlet pipes connected on the left and right sides of each liquid-cooled battery module respectively, each of the third return pipes being connected with the second return pipe, and each of the third inlet pipes being connected with the second inlet pipe.

[0014] Further, the pH intelligent monitoring system comprises a pH detector and a first anti-interference communication line, the pH detector being installed on the first outlet pipe, and the first anti-interference communication line being connected with the liquid-cooled battery module.

[0015] A control method of a liquid-cooled energy storage container for monitoring the service life of the cooling liquid and regulating the pressure, characterized by comprising the following steps:

[0016] Step 1: defining the system value of the liquid-cooled energy storage container, setting the cooling liquid temperature T, the maximum battery temperature Tmax, the system cooling liquid pressure P, the initial cooling liquid pH value pH1, the extreme cooling liquid temperature of minus 40℃ and 45℃.

[0017] Step two: the liquid-cooled energy storage container system is powered on, and the system confirms that the water-cooled unit, the pH intelligent monitoring system and the high-sensitivity self-pressure regulator are powered on, operate normally and communicate normally.

[0018] Step three: the water-cooled unit and the high-sensitivity self-pressure regulator collect the system normal operation pressure value P1, the pH intelligent monitoring system collects the initial pH value of the cooling liquid pH1, the BMS control system of the liquid-cooled battery module collects the maximum temperature Tmax of the battery cell, and the water-cooled unit collects the cooling liquid temperature T.

[0019] When T≤-45℃ or T≥45℃, the liquid cooling system stops charging and discharging.

[0020] When -40℃

[0021] When 25℃

[0022] When T=25℃, the system pressure P=P1, and the liquid-cooled energy storage container normally charges and discharges.

[0023] When the liquid-cooled energy storage container normally charges and discharges, the pH intelligent monitoring system detects that pH

[0024] When the liquid-cooled energy storage container normally charges and discharges, the pH intelligent monitoring system detects that pH

[0025] In summary, the present application has the following advantages over the prior art:

[0026] The application provides a liquid-cooled energy storage container and a control method for monitoring the service life and pressure regulation of coolant. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 It is a schematic view of the application.

[0028] Fig. 2 It is a bottom view of the application.

[0029] Fig. 3 It is a schematic view of the high-sensitivity self-regulating pressure regulator of the application.

[0030] The reference signs are as follows: 1, heat insulation container body; 2, heat insulation wallboard; 3, liquid-cooled battery module; 4, battery cluster; 5, water-cooling unit; 6, primary water outlet pipe; 7, primary water return pipe; 8, circulation part; 10, pH intelligent monitoring system; 11, high-sensitivity self-regulating pressure regulator; 81, secondary water inlet pipe; 82, secondary water return pipe; 91, tertiary water return pipe; 92, tertiary 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 film; 117, inert gas; 118, pressure-increasing nozzle. DETAILED DESCRIPTION

[0031] The application will be further described in combination with the description of the drawings and specific embodiments:

[0032] As Figs. 1 to 3The liquid-cooled energy storage container for monitoring the service life of the coolant and pressure regulation shown comprises: a heat-insulating container body 1, a heat-insulating wall plate 2 is arranged on the left side of the heat-insulating container body 1, characterized in that: liquid-cooled battery modules 3 are stacked on the right side of the heat-insulating container body 1 from bottom to top, each of the plurality of liquid-cooled battery modules 3 stacked from bottom to top is a group, a plurality of groups of liquid-cooled battery modules 3 are arranged on the right side of the heat-insulating container body 1 at intervals, and a battery cluster 4 is connected at the bottom of each liquid-cooled battery module 3; a water-cooling unit 5 is arranged on the left side of the heat-insulating container body 1, a first water outlet pipe 6 is connected at the water outlet of the water-cooling unit 5, and a first water return pipe 7 is connected at the water return outlet of the water-cooling unit 5; a circulating part 8 is connected with the first water outlet pipe 6 and the first water return pipe 7 respectively, and is used for guiding the coolant in the first water outlet pipe 6 to the battery cluster 4 and guiding the heated coolant of the battery cluster 4 to the first water return pipe 7; a connecting part 9 is connected between the liquid-cooled battery module 3 and the circulating part 8, and is used for guiding the heated coolant of the liquid-cooled battery module 3 to the circulating part 8; a pH intelligent monitoring system 10 is installed on the first water outlet pipe 6, and is used for detecting the acidity of the coolant; and a high-sensitivity self-pressure regulator 11 is connected between the water-cooling unit 5 and the first water return pipe 7, and is used for adjusting the volume pressure of the coolant in the first water return pipe 7.

[0033] The liquid-cooled energy storage container for monitoring the service life of the coolant and pressure regulation shown above, the liquid-cooled battery module 3 is a module-level unit module composed of battery cells, BMS control systems, water-cooling plates and other components, the liquid-cooled battery module 3 generates heat through charging and discharging, and the heat is the object unit required to be cooled by the technical solution, the battery cluster 4 is a battery cluster 4 unit stacked together in the vertical direction by a plurality of liquid-cooled battery modules 3, the first water outlet pipe 6 is connected with the water outlet of the water-cooling unit 5, and the coolant of the water-cooling unit 5 is guided to the inside of the liquid-cooled energy storage container; the first water return pipe 7 is connected with the water return outlet of the water-cooling unit 5, and the heated coolant of the energy storage container is guided to the water-cooling unit 5; the circulating part 8 guides the coolant in the first water outlet pipe 6 to the battery cluster 4 and guides the heated coolant of the battery cluster 4 to the first water return pipe 7; the connecting part 9 guides the heated coolant of the liquid-cooled battery module 3 to the circulating part 8; the pH intelligent monitoring system 10 detects the pH value acidity of the pipeline in the liquid-cooled energy storage container, and the monitoring system also monitors the battery temperature; and the high-sensitivity self-pressure regulator 11 adjusts the pressure of the pipeline in the liquid-cooled energy storage container.

[0034] As Fig. 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. 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 directs the coolant after heating of the battery cluster 4 to the primary water return pipe 7. The secondary water inlet pipe 81 directs the coolant in the primary water outlet pipe 6 to the battery cluster.

[0035] like Fig. 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, and each of the tertiary inlet pipes 92 is connected to the secondary inlet pipe 81. The tertiary return pipe 91 is connected to the secondary inlet pipe 81 at one end and to the liquid-cooled battery module 3 at the other end. The tertiary return pipe 91 is used to guide the coolant heated by the liquid-cooled battery module 3 into the secondary return pipe 82.

[0036] like Fig. 2 As shown, in some embodiments of the present invention, in order to achieve the effect of detecting the acidity 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.

[0037] 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 10 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 acidity value and the system battery temperature rises significantly, the pH value triggers an alarm to remind technicians to replace the coolant.

[0038] like Fig. 3As shown, in some embodiments of the present application, in order to achieve the effect of adjusting the pressure of the cooling liquid in the primary return water pipe 7, 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 inert gas 117. The shell 115 is connected and installed on the primary return water pipe 7, a pressurizing nozzle 118 is provided on the top of the shell 115, the piston 112 is provided on the pressurizing nozzle 118, the pressure regulator 111 is provided above the piston 112, the pressure spring 113 is provided between the pressure regulator 111 and the piston 112, the composite elastic film 116 is provided in the shell 115 and covers the connection end of the shell 115 and the primary return water pipe 7, the inert gas 117 is provided in the shell 115 and outside the composite elastic film 116, and the second anti-interference communication line 114 is connected between the pressure regulator 111 and the water cooling unit 5.

[0039] When the liquid-cooled energy storage container for monitoring the service life of the coolant and pressure regulation using the above structure is in operation, the high-sensitivity self-pressure regulator is 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 inert gas 117. The pressure regulator 111 is an automatic setting for pressure relief or pressure increase through the principle of 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 insulation material, can withstand 100 times the system pressure without deformation, has good insulation, heat insulation and fireproofing properties, is connected and fixed at the bottom with the first-stage water outlet pipe 6, and has a pressure increasing nozzle 118 at the top for amplifying the pressure value and increasing the pressure sensitivity. The pressure spring 113 is an element for executing the pressure command of the pressure regulator, is made of a material with high elasticity and high strength. The piston 112 realizes the functions of sealing and pressure transmission, and has extremely low friction resistance at the sealing interface. The composite elastic film 116 is made of a composite material with high elasticity and high flexibility, does not deform with temperature change, is fixed at the opening of the shell 115 and directly connected with the first-stage water outlet pipe 6, and the coolant can directly enter and exit the composite elastic film 116. The inert gas 117 is sealed between the shell 115 and the composite elastic film 116, is non-toxic, colorless, odorless, chemically stable, has good compressibility, does not change in density and volume with temperature change, only transmits the expansion and contraction force of the composite elastic film 116, compresses and transmits the force of the composite elastic film 116 to the pressure increasing nozzle 118, amplifies the pressure and transmits it to the piston 112, pushes the pressure spring 113 to trigger the pressure regulator 111, the pressure regulator 111 reads the pressure value, analyzes the actual system pressure value, sends a pressure signal to the BMS, the water cooling unit 5 also sends a pressure value signal to the BMS, the BMS confirms and then feeds back a pressure regulation signal to the pressure regulator 111 to execute pressure regulation action. When the system pressure is greater than the system set value, the pressure of the inert gas 117 on the composite elastic film 116 is lower than the system pressure, the coolant enters the composite elastic film 116, the composite elastic film 116 expands to accommodate more coolant due to its high flexibility and elasticity, the volume increases to compress the inert gas, the pressure regulator detects that the pressure value exceeds the set value, the water cooling unit 5 sends an overpressure warning signal 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, plays a role in pressure relief of the entire liquid cooling system, and stores the excess coolant in the composite elastic film 116.

[0040] A control method of a liquid-cooled energy storage container for monitoring the service life of the coolant and pressure regulation, characterized by comprising the following steps:

[0041] Step one: define the value of the liquid-cooled energy storage container system, set the coolant temperature T, the maximum battery temperature Tmax, the system coolant pressure P, the initial coolant pH value pH1, the coolant extreme temperature of minus 40℃ and 45℃;

[0042] Step two: power on the liquid-cooled energy storage container system, the system confirms that the water cooling unit 5, the pH intelligent monitoring system 10, and the high-sensitivity self-pressure regulator 11 are powered on and running normally in communication;

[0043] Step three: the water cooling unit 5 and the high-sensitivity self-pressure regulator 11 collect the system normal operation pressure value P1, the pH intelligent monitoring system 10 collects the initial pH value of the coolant pH1, the BMS control system of the liquid-cooled battery module 3 collects the maximum temperature of the battery cell Tmax, and the water cooling unit 5 collects the coolant temperature T;

[0044] When T≤-45℃ or T≥45℃, the liquid cooling system stops charging and discharging;

[0045] When -40℃

[0046] When 25℃

[0047] When T=25℃, the system pressure P=P1, and the liquid-cooled energy storage container normally charges and discharges;

[0048] When the liquid-cooled energy storage container normally charges and discharges, the pH intelligent monitoring system 10 detects that pH

[0049] When the liquid-cooled energy storage container normally charges and discharges, the pH intelligent monitoring system 10 detects that pH

[0050] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A liquid-cooled energy storage container for monitoring coolant life and pressure regulation, comprising: The heat insulation container body (1) is provided with a heat insulation wall plate (2) on the left side, characterized in that: The liquid-cooled battery module (3) is stacked on the right side of the heat insulation container body (1) from bottom to top, and each group of liquid-cooled battery modules (3) stacked from bottom to top is a group, and the right side of the heat insulation container body (1) is provided with a plurality of groups of liquid-cooled battery modules (3), and a battery cluster (4) is connected at the bottom of each liquid-cooled battery module (3); The water cooling unit (5) is arranged on the left side of the heat insulation container body (1), a first water outlet pipe (6) is connected at the water outlet of the water cooling unit (5), and a first water return pipe (7) is connected at the water inlet of the water cooling unit (5); The circulation part (8) is connected with the first water outlet pipe (6) and the first water return pipe (7) respectively, and is used for guiding the cooling liquid in the first water outlet pipe (6) to the battery cluster (4) and guiding the heated cooling liquid of the battery cluster (4) to the first water return pipe (7); The connecting part (9) is connected between the liquid-cooled battery module (3) and the circulation part (8), and is used for guiding the heated cooling liquid of the liquid-cooled battery module (3) to the circulation part (8); The pH intelligent monitoring system (10) is installed on the first water outlet pipe (6) and is used for detecting the pH value of the cooling liquid; The high-sensitivity self-pressure regulator (11) is connected between the water cooling unit (5) and the first water return pipe (7), and is used for adjusting the volume pressure of the cooling liquid in the first water return pipe (7), 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 the first water return pipe (7), a pressure boosting nozzle (118) is communicated at the top of the shell (115), the piston (112) is arranged on the pressure boosting 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 of the shell (115) and the first water return pipe (7), the inert gas (117) is arranged in the shell (115) and outside the composite elastic film (116), and the second anti-interference communication line (114) is connected between the pressure regulator (111) and the water cooling unit (5).

2. The liquid-cooled energy storage container of claim 1, wherein The circulation part (8) comprises a second water inlet pipe (81) connected on one side of each battery cluster (4), each second water inlet pipe (81) is communicated with the first water outlet pipe (6), a plurality of second water return pipes (82) are communicated on the first water return pipe (7), and each second water return pipe (82) is connected with the adjacent battery cluster (4).

3. The liquid-cooled energy storage container of claim 2, wherein The connecting part (9) comprises third-level return water pipes (91) and third-level water inlet pipes (92) respectively connected to the left and right sides of each liquid-cooled battery module (3), each third-level return water pipe (91) is connected with a second-level return water pipe (82), and each third-level water inlet pipe (92) is connected with a second-level water inlet pipe (81).

4. The liquid-cooled energy storage container of claim 3, wherein The pH intelligent monitoring system (10) comprises a pH detector (101) and a first anti-interference communication line (102), the pH detector (101) is arranged on the first-level water outlet pipe (6), and the first anti-interference communication line (102) is connected with the liquid-cooled battery module (3).

5. The control method of the liquid-cooled energy storage container for monitoring the life of the coolant and regulating the pressure according to claim 4, characterized in that The method comprises the following steps: Step one: defining values of the liquid-cooled energy storage container system, setting a cooling liquid temperature T, a maximum battery temperature Tmax, a system cooling liquid pressure P, an initial cooling liquid pH value pH1, an extreme cooling liquid temperature of minus 40 DEG C and 45 DEG C; Step two: powering on the liquid-cooled energy storage container system, and the system confirming that the water cooling unit (5), the pH intelligent monitoring system (10) and the high-sensitivity self-pressure regulator (11) are powered on, in operation and in normal communication; Step three: the water cooling unit (5) and the high-sensitivity self-pressure regulator (11) collect a system normal operation pressure value P1, the pH intelligent monitoring system (10) collects an initial cooling liquid pH value pH1, a BMS control system of the liquid-cooled battery module (3) collects a maximum battery temperature Tmax, and the water cooling unit (5) collects a cooling liquid temperature T; When T is less than or equal to minus 45 DEG C or greater than or equal to 45 DEG C, the liquid cooling system stops charging and discharging; When minus 40 DEG C is less than T and less than 25 DEG C, the system pressure P is less than P1, the water cooling unit (5) sends a low-pressure warning signal, the high-sensitivity self-pressure regulator (11) detects a current real-time pressure value P, and the BMS control system of the liquid-cooled battery module (3) accepts the high-sensitivity self-pressure regulator (11) and sends a pressurization instruction to the high-sensitivity self-pressure regulator (11) to push stored cooling liquid pressure into the first-level return water pipe (7) until P is equal to P1, and the liquid-cooled energy storage container normally charges and discharges; When 25 DEG C is less than T and less than 45 DEG C, the system pressure P is greater than P1, the water cooling unit (5) sends a high-pressure warning signal, the high-sensitivity self-pressure regulator detects a current real-time pressure value P, and the BMS control system of the liquid-cooled battery module (3) sends a pressurization instruction to the high-sensitivity self-pressure regulator (11) to release pressure and store excess cooling liquid until P is equal to P1, and the liquid-cooled energy storage container normally charges and discharges; When T is equal to 25 DEG C, the system pressure P is equal to P1, and the liquid-cooled energy storage container normally charges and discharges; When the liquid-cooled energy storage container normally charges and discharges, the pH intelligent monitoring system (10) detects that the pH is less than pH1 and the maximum battery temperature Tmax is less than 40 DEG C, and the temperature growth rate is consistent with the big data growth rate, the liquid-cooled energy storage container continues to normally charge and discharge. When the liquid-cooled energy storage container is in the normal charging and discharging process, the pH intelligent monitoring system (10) detects that pH < pH1 and the maximum battery temperature Tmax> 40℃, and there is a significant increase in the comparison of the temperature growth rate and the big data growth rate, the liquid-cooled energy storage container pH value sends an alarm signal, the cooling liquid life expires to meet the termination replacement condition, the liquid-cooled container is powered off to replace the new cooling liquid, and the liquid-cooled energy storage container is powered on for normal charging and discharging after replacing the cooling liquid.

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