An immersion cooling experimental platform for energy storage batteries and a temperature feedback control method

Abstract

This invention belongs to the field of energy storage battery technology and discloses an immersion cooling experimental platform for energy storage batteries and a temperature feedback control method. The method includes: after forming a stable circulating cooling loop, a PLC programmable controller controls the speed of a gear pump to obtain a normal cooling flow rate. Q n Maintain normal cooling flow. Q n This forms a normal operating cooling loop. The data acquisition unit collects real-time data on flow rate, battery center point temperature, cooling medium temperature in the immersion container, and pressure in the immersion container. Based on the real-time temperature of the energy storage battery, it uses a preset temperature feedback zoning control algorithm to perform zoning control of the cooling medium temperature. This invention effectively overcomes the core defects of existing air-cooled / cold plate liquid-cooled / direct-cooled technologies, such as poor temperature uniformity, flow dead zones in immersion technology, and insufficient utilization of the "temperature and heat dissipation integration".

Description

Technical Field

[0001] This invention belongs to the field of energy storage battery technology, and particularly relates to an immersion cooling experimental platform for energy storage batteries and a temperature feedback control method. Background Technology

[0002] Lithium iron phosphate (LiFePO4, LFP) batteries are widely used in energy storage power stations due to their long lifespan, high-temperature stability, fast charging speed, and cost advantages, and are trending towards larger capacities. However, the increase in battery size and capacity exacerbates the problem of internal temperature unevenness. Battery cycle performance and safety are highly temperature-dependent, with an optimal operating temperature range of 15℃-35℃. Excessively low temperatures lead to decreased ion migration rates, causing capacity decay and reduced efficiency; excessively high temperatures can easily trigger thermal runaway. Precise temperature control can optimize battery performance, broaden application scenarios, and maximize the delay of battery aging and improve safety.

[0003] The main challenges currently facing thermal management applications of energy storage batteries include: high heat dissipation per unit volume of large-capacity, prismatic battery cells; and difficulties in controlling temperature uniformity due to high-density battery deployment within the limited space of prefabricated compartments. Existing air-cooling technologies are insufficient in cooling efficiency; while liquid cooling and direct cooling technologies can achieve rapid localized cooling, localized hot spots still exist. Therefore, there is an urgent need to develop a thermal management method and control mechanism that is efficient in achieving uniform temperature and ensures safety for large-capacity, large-volume energy storage batteries.

[0004] Compared to power batteries, energy storage batteries have larger individual cell capacities and significantly increased volume. Current mainstream thermal management technologies (air cooling, liquid cooling with cold plates, and direct phase change cooling with cold plates) are limited by the effective contact area between the battery and the cold source, and can only achieve localized temperature uniformity. At the same time, the large axial and radial dimensions of the battery's internal core lead to delayed heat transfer and the formation of localized high-temperature areas.

[0005] While immersion thermal management technology holds great potential, its current applications still have limitations: the flow of internal cooling medium may be restricted, leading to uneven heat flow between batteries (hot spot issues). Furthermore, existing immersion solutions fail to fully leverage their integrated advantages of "temperature control and thermal runaway suppression," simultaneously achieving efficient temperature control, thermal runaway prevention, and fire suppression functions.

[0006] Therefore, there is an urgent need to develop a novel immersion thermal management platform and its control algorithm to solve the problems of temperature uniformity and safety in large-capacity, large-volume energy storage batteries. Summary of the Invention

[0007] To overcome the problems existing in related technologies, the present invention discloses an immersion thermal management platform and a temperature feedback control method, specifically relating to an immersion cooling experimental platform for energy storage batteries and a temperature feedback control method.

[0008] The technical solution is as follows: A temperature feedback control method for an immersion thermal management platform, the method comprising:

[0009] S1, inject the immersion cooling medium into the high and low temperature water tank, and perform constant temperature cooling medium at room temperature of 25℃;

[0010] S2, the constant-temperature cooling medium flows in through the low-temperature inlet of the plate heat exchanger, flows out through the low-temperature outlet, and enters the gear pump. The PLC programmable controller controls the speed of the gear pump to obtain the initial flow rate. Q 0;

[0011] S3, the constant temperature cooling medium is transported by a gear pump through a gear flow meter, and flows according to the preset initial flow rate. Q 0 enters the immersion container via the pressure transmitter and the opened inlet ball valve;

[0012] S4, the outlet ball valve is in the closed state. When the height of the cooling medium in the immersion container exceeds the height of the energy storage battery, the outlet ball valve is opened; the charge / discharge machine is turned on and charging / discharging operations are performed.

[0013] S5, the cooling medium flows through the outlet ball valve, enters the heat inlet of the plate heat exchanger through the pipeline, and after the cooling medium dissipates heat through the plate heat exchanger, it flows out through the heat outlet and flows back to the high and low temperature water tank through the inlet of the high and low temperature water tank, forming a circulating cooling loop.

[0014] S6, after a stable circulating cooling loop is formed, the PLC programmable controller controls the gear pump speed to obtain normal cooling flow. Q n ;

[0015] S7, maintain normal cooling flow. Q n This forms a normal operating cycle cooling loop; the data acquisition unit collects the flow rate, battery center point temperature, cooling medium temperature in the immersion container, and pressure in the immersion container in real time, and performs cooling medium temperature feedback zone control based on the real-time temperature of the energy storage battery using a preset temperature feedback zone control algorithm.

[0016] In step S7, the cooling medium temperature feedback zone control using a preset temperature feedback zone control algorithm includes:

[0017] The data acquisition unit collects battery temperature data from the temperature sensor in real time. T cell Temperature of the cooling medium inside the container obtained by the PT100 temperature sensor T coolant The PLC programmable controller is used to acquire temperature sensor signals and PT100 temperature sensor signals in real time, and process them to obtain the target control temperature difference Δ of the battery. T ;

[0018] If the energy storage battery temperature T cell <15℃ and the temperature of the cooling medium inside the immersion container T coolant ≥25℃, combined with the target control temperature difference Δ of the energy storage battery T Real-time flow adjustment is performed to complete low-temperature preheating;

[0019] If the energy storage battery temperature is 15℃ ≤ T cell At temperatures below 35℃, adjust the gear pump speed and coolant flow rate to achieve ambient temperature stabilization.

[0020] If the energy storage battery temperature is 35℃ ≤ T cell When the temperature is below 100℃, the gear pump is activated in gradient boost mode to complete high-temperature cooling.

[0021] If the energy storage battery temperature T cell ≥ 100℃ or pressure change rate within the immersion container dp / dt >50 kPa / s, coolant flow rate is locked. Q h,max This completes the suppression of thermal runaway.

[0022] During the low-temperature preheating process, the high-low temperature water bath heats the coolant to 30°C, while the cooling flow rate remains at the normal cooling flow rate. Q n And combined with the target control temperature difference Δ of the energy storage battery T Perform real-time flow rate adjustment; set rotation speed to 1000 rpm, initial flow rate... Q n It is 0.66 L / min;

[0023] If the temperature of the cooling medium inside the immersion container is... T coolant At temperatures below 25℃, a medium cooling flow rate should be applied. Q m Operating speed 2000 rpm, medium cooling flow rate Q m It is 1.32 L / min.

[0024] During the temperature averaging process, the high and low temperature water baths are maintained at a constant temperature of 25°C; if the target temperature difference Δ of the energy storage battery is controlled... T <1℃, operating speed 500 rpm, small cooling flow rate Q s It is 0.33 L / min;

[0025] If the target control temperature difference of the energy storage battery is 1℃≤ΔT <2℃, operating speed 2000 rpm, medium cooling flow rate Q m It is 1.32 L / min;

[0026] If the battery target control temperature difference Δ T ≥2℃, operating speed 4000 rpm, large cooling flow rate Q h It is 2.64 L / min.

[0027] During the high-temperature cooling process, the temperature of the high-low temperature water bath is controlled at 20℃, and the gradient boost mode of the gear pump is activated. Q gradient = Q m + α ·( T cell -35) 2 In the formula α The gain coefficient for flow regulation. α =0.1 L / min·℃ 2 ; Q gradient The output flow rate after gradient pressurization. Q m Medium cooling flow rate T cell Battery temperature;

[0028] If the temperature of the cooling medium inside the immersion container is... T c >35℃ triggers pulse jet, pulse jet lasts 10 seconds. Q h Add 10 seconds Q s cycle;

[0029] During the thermal runaway suppression process, the cooling medium in the high and low temperature water tank was rapidly cooled to 5°C, and the cooling flow rate was locked. Q h,max Execute speed 6000 rpm, lock flow rate Q h,max The flow rate is 3.96 L / min; the liquid nitrogen injection interface / system or perfluorohexanone injection interface / system configured with a high and low temperature water bath are used as auxiliary means to suppress thermal runaway.

[0030] The corrected flow rate of the target cooling medium includes: Q corrector = K p · Δ T + K i · ∫ Δ T dt + K d · d (Δ T ) / dt; In the formula: Δ T Δ represents the temperature difference between the battery temperature and the target control temperature. T = T cell - T target ; T target To control the target temperature of energy storage batteries, Q corrector The corrected flow rate for the target cooling medium. K p This is the proportionality coefficient. K i The coefficient of the integral term, K d The coefficients of the differential term, t For time.

[0031] Another objective of this invention is to provide an immersion thermal management platform, which includes a high-low temperature water tank, the outlet of which is connected to a standard pagoda interface, and is connected to the low-temperature inlet of a plate heat exchanger via a standard two-part pipe.

[0032] The cooling medium flows through the plate heat exchanger and exits through the low-temperature outlet, which is connected to the gear pump inlet via a pipeline. After the fluid is pumped and performs work, it flows out through the outlet, enters the gear flow meter inlet through the fluid pipeline, exits through the gear flow meter outlet, passes through the pressure transmitter, and enters the immersion container through the inlet ball valve. The energy storage battery is placed inside the immersion container, and the cooling medium inside the immersion container flows through the outlet ball valve via a pipeline. It then enters the high-temperature inlet of the plate heat exchanger via a pipeline, flows through the plate heat exchanger and exits through the high-temperature outlet, and returns to the high-low temperature water tank through the high-low temperature water tank inlet.

[0033] The high and low temperature water tank is equipped with a liquid nitrogen injection interface / system and a perfluorohexanone injection interface / system;

[0034] Multiple temperature sensors of the same specifications are distributed on the positive and negative electrode tabs of the energy storage battery and at the center of the large surface of the energy storage battery to collect the temperature of the positive electrode, negative electrode and the center of the two large surfaces of the energy storage battery.

[0035] The PT100 temperature sensor measures the temperature of the cooling medium inside an immersed container;

[0036] The charge / discharge machine is used to simulate different charging and discharging conditions of energy storage batteries;

[0037] The data acquisition unit is connected to the gear flow meter, pressure transmitter, temperature sensor, and PT100 temperature sensor via circuitry to acquire electrical signals.

[0038] The PLC programmable controller is used to acquire temperature sensor signals and PT100 temperature sensor signals in real time. Based on the preset energy storage battery temperature, the target control temperature difference of the energy storage battery, and the feedback zone control algorithm of the cooling medium temperature in the immersion container, it is used to control the temperature of the high and low temperature water tank and the speed of the gear pump to obtain the optimal cooling medium temperature and flow rate.

[0039] The immersion container includes a container body, a rubber sealing ring, and a container end cap;

[0040] The third standard two-point threaded hole in the container body is the cooling medium inlet, which together with the first standard two-point threaded hole is the cooling medium outlet, forming the first cooling circuit.

[0041] The second standard two-point threaded hole in the container body is the cooling medium inlet, and the fourth standard two-point threaded hole can form the cooling medium outlet to form the second cooling circuit.

[0042] The first standard three-part threaded hole in the container body is the cooling medium inlet, and the third standard three-part threaded hole is the cooling medium outlet, which can form the third cooling circuit.

[0043] The fourth standard three-part threaded hole in the container body is the cooling medium inlet, and together with the second standard three-part threaded hole, the cooling medium outlet, forms the fourth cooling circuit.

[0044] The PLC (Programmable Logic Controller) uses a preset zonal control algorithm based on the energy storage battery temperature, the target control temperature difference of the energy storage battery, and the temperature feedback of the cooling medium in the immersion container. This algorithm controls the high and low temperature water bath temperature and the gear pump speed based on temperature feedback. After obtaining the optimal cooling medium temperature and flow rate, it further performs intelligent switching of the cooling circuit, including:

[0045] The first and second cooling circuits are used in parallel. The first cooling circuit is periodically opened and the second cooling circuit is closed through the inlet and outlet ball valves; or the second cooling circuit is opened and the first cooling circuit is closed. This is used for the cooling medium to enter and exit the immersion container laterally or longitudinally. The third and fourth cooling circuits are used in parallel. The third cooling circuit is periodically opened and the fourth cooling circuit is closed through the inlet and outlet ball valves; or the fourth cooling circuit is opened and the third cooling circuit is closed. This is used for the cooling medium to enter and exit the immersion container laterally or longitudinally.

[0046] Combining all the above technical solutions, the beneficial effects of this invention are as follows:

[0047] First, high-efficiency temperature uniformity: Through the unique multi-inlet / multi-outlet design of the immersion container and the switchable horizontal / vertical cooling circuit, the flow distribution of the cooling medium in the container is significantly improved, effectively eliminating low flow areas (dead zones) and greatly improving the temperature uniformity of large energy storage batteries.

[0048] The intelligent zoning control method proposes a temperature feedback zoning control approach, which dynamically adjusts the cooling medium flow rate and temperature in real time based on the battery temperature difference and the medium temperature, thus achieving zoning functionality.

[0049] Low-temperature preheating: to prevent battery performance degradation at low temperatures.

[0050] Ambient temperature: Maintains stable and efficient operation within the optimal operating temperature range.

[0051] High-temperature cooling: rapidly suppresses temperature rise and prevents heat accumulation.

[0052] Thermal runaway suppression: Provides powerful cooling at extreme high temperatures and has fire suppression capabilities.

[0053] Integrated temperature and heat suppression: It organically integrates efficient thermal management and thermal runaway fire suppression functions on the immersion cooling platform, giving full play to the comprehensive advantages of immersion cooling.

[0054] Flexible: The design of cooling circuits with different pipe diameters facilitates the study of the impact of pipe specifications on system performance and provides a design basis for practical engineering applications.

[0055] Secondly, this invention pioneered the design of a multi-loop dynamic flow field technology, which solves the flow dead zone problem of immersion cooling simply and effectively through four sets of switchable cooling loops (lateral / longitudinal flow + different pipe diameters). It integrates thermal management and thermal runaway suppression (liquid nitrogen / perfluorohexanone injection) onto the same platform, and proposes a four-segment control strategy (preheating / uniformity / cooling / thermal runaway) and a gradient pressurization method, providing an adaptive control framework. Attached Figure Description

[0056] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure;

[0057] Figure 1 This is a structural diagram of the immersion thermal management platform provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the immersion container provided in an embodiment of the present invention;

[0059] Figure 3 This is a schematic diagram of the container body provided in an embodiment of the present invention;

[0060] Figure 4This is a schematic diagram showing the location of the fourth standard two-point threaded hole in the container body provided in an embodiment of the present invention;

[0061] Figure 5 This is a diagram of the container end cap provided in an embodiment of the present invention;

[0062] Figure 6 This is a flowchart of the immersion thermal management platform and temperature feedback control method provided in the embodiments of the present invention;

[0063] Figure 7 This is a dynamic process diagram of the immersion flow adaptive adjustment cooling medium flow rate of the present invention;

[0064] In the diagram: 1. High and low temperature water tank; 2. Plate heat exchanger; 3. Gear pump; 4. Gear flow meter; 5. Pressure transmitter; 6. Inlet ball valve;

[0065] 7. Immersion container; 100. Container body;

[0066] 101. First standard hole; 102. Second standard hole; 103. Third standard hole; 104. Fourth standard hole; 105. Fifth standard hole; 106. Sixth standard hole; 107. Sealing ring groove; 108. First standard 2 / 3 threaded hole; 109. First standard 3 / 4 threaded hole; 110. Second standard 3 / 4 threaded hole; 111. Second standard 2 / 3 threaded hole; 112. Third standard 3 / 4 threaded hole; 113. Third standard 2 / 3 threaded hole; 114. Fourth standard 3 / 4 threaded hole; 115. Fourth standard 2 / 3 threaded hole;

[0067] 200. Rubber sealing ring;

[0068] 300. Container end caps;

[0069] 301. Standard hole for the first end cap; 302. Standard hole for the second end cap; 303. Standard hole for the third end cap; 304. Standard hole for the fourth end cap; 305. Standard hole for the fifth end cap; 306. Standard hole for the sixth end cap; 307. End cap sealing ring groove; 308. Standard 2 / 3 inch threaded hole for the first end cap; 309. Standard 2 / 3 inch threaded hole for the second end cap; 310. Standard 2 / 3 inch threaded hole for the third end cap; 311. Standard 2 / 3 inch threaded hole for the fourth end cap; 312. Center hole for the end cap; 313. Standard M20 threaded hole;

[0070] 8. Energy storage battery; 9. Temperature sensor; 10. Pressure sensor; 11. Outlet ball valve; 12. PT100 temperature sensor; 13. Charger / discharger; 14. Data acquisition unit; 15. PLC programmable controller. Detailed Implementation

[0071] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0072] Addressing the core issues of high heat dissipation per unit volume in large-scale energy storage battery cells and poor temperature uniformity due to high-density battery deployment within the limited space of prefabricated enclosures, this invention innovates by proposing an immersion-type thermal management platform and a temperature feedback control method. It designs four switchable cooling loop structures, periodically switching the lateral / longitudinal flow fields to completely eliminate flow dead zones and achieve uniform temperature across the entire space. Based on a temperature zoning control algorithm (low-temperature preheating / normal-temperature uniform temperature / high-temperature gradient pressurization + pulse jet mechanism / thermal runaway rapid cooling), dynamic flow regulation and adaptive control of the cooling medium temperature are employed to achieve full-temperature-domain response. Integrating a "temperature and heat dissipation integrated" function (thermal management + liquid nitrogen / perfluorohexanone injection system), it simultaneously solves the long-standing problems of poor temperature uniformity, delayed safety response, and low energy efficiency in the energy storage field, meeting the thermal management and safety requirements of large-scale energy storage power plants.

[0073] This invention features a structural innovation:

[0074] Multi-loop switchable design: at least two sets (such as 1 / 2 loop and 3 / 4 loop) of independent inlet and outlet pairs, which can be switched by valves to achieve horizontal or vertical flow of the cooling medium. This is a core hardware innovation that solves the flow dead zone and improves temperature uniformity.

[0075] Different pipe diameter designs: Includes at least two pipe diameter specifications (such as 2-point pipe and 3-point pipe loop), which facilitates research and optimization and has practicality and value.

[0076] The bottom surface is flush with the inlet: This facilitates the complete drainage of the medium and is a practical and thoughtful design detail.

[0077] This invention innovatively proposes the following method:

[0078] Temperature zoning + dual-parameter feedback: The system divides the battery temperature into four key zones (low temperature, normal temperature, high temperature, and thermal runaway), and coordinates and independently adjusts two core control variables—cooling medium temperature (set via the water tank) and cooling medium flow rate (set via pump speed)—based on the target control temperature difference of the battery and the temperature of the cooling medium inside the container. This logic, based on dual temperature parameters, zoning, and coordinated control, is significantly innovative.

[0079] Multifunctional integration: A single control logic realizes four functions: low-temperature preheating, ambient temperature equalization, high-temperature cooling, and thermal runaway suppression. In particular, the use of powerful cooling as a fire suppression method for thermal runaway suppression embodies the design concept of "integrated temperature and fire suppression".

[0080] Example 1, such as Figure 1 As shown, the immersion thermal management platform provided in this embodiment of the invention includes a high and low temperature water tank 1, a plate heat exchanger 2, a gear pump 3, a gear flow meter 4, a pressure transmitter 5, an inlet ball valve 6, an immersion container 7, an energy storage battery 8, a temperature sensor 9, a pressure sensor 10, an outlet ball valve 11, a PT100 temperature sensor 12, a charge / discharge machine 13, a data acquisition unit 14, and a PLC programmable controller 15. Figure 1 A dashed line indicates a pipe connection, while a double-dotted line indicates a circuit connection.

[0081] The outlet of the high and low temperature water tank 1 can be connected to a standard pagoda interface and connected to the low temperature inlet of the plate heat exchanger 2 through a two-way or other standard specification pipeline.

[0082] The plate heat exchanger 2 includes two inlets: a low-temperature inlet and a high-temperature inlet, and two outlets: a low-temperature outlet and a high-temperature outlet. The cooling medium flows through the plate heat exchanger 2, exiting through the low-temperature outlet, which is connected to the inlet of the gear pump 3 via a pipeline. After the fluid is pumped by the gear pump 3, it flows out through the outlet, through a fluid pipeline to the inlet of the gear flow meter 4, and out through the outlet of the gear flow meter 4. It then passes through the pressure transmitter 5, through the inlet ball valve 6, and into the immersion container 7. The energy storage battery 8 is placed inside the immersion container 7. The cooling medium inside the immersion container 7 flows through a pipeline through the outlet ball valve 11. It further flows through a pipeline to the high-temperature inlet of the plate heat exchanger 2, through the plate heat exchanger 2, through the high-temperature outlet, and back to the high-low temperature water tank 1 through the inlet of the high-low temperature water tank 1.

[0083] The high and low temperature water tank 1 is equipped with a liquid nitrogen injection interface / system and a perfluorohexanone injection interface / system.

[0084] Four identical temperature sensors 9 are distributed at the positive and negative electrode tabs of the energy storage battery 8 and at the center of the large surface of the energy storage battery 8, and are used to collect the temperature of the positive electrode, negative electrode and the center of the two large surfaces of the energy storage battery 8.

[0085] The PT100 temperature sensor 12 can measure the temperature of the cooling medium inside the immersion container 7.

[0086] The charge / discharge machine 13 is used to simulate different operating conditions such as charging and discharging of the energy storage battery 8.

[0087] The data acquisition unit 14 is connected to the gear flow meter 4, pressure transmitter 5, temperature sensor 9, pressure sensor 10 and PT100 temperature sensor 12 via circuits to acquire electrical signals.

[0088] The PLC programmable controller 15 is mainly used to acquire the signals from the temperature sensor 9 and the PT100 temperature sensor 12 in real time. Based on the preset temperature of the energy storage battery 8, the target control temperature difference of the energy storage battery 8, and the temperature feedback zoning control algorithm of the cooling medium in the immersion container 7, it is used to control the temperature of the high and low temperature water tank 1 and the speed of the gear pump 3 to obtain the optimal cooling medium temperature and flow rate, thereby obtaining the best cooling effect.

[0089] like Figure 2 As shown, the immersion container 7 includes a container body 100, a rubber sealing ring 200, and a container end cap 300.

[0090] Container body 100, such as Figure 3 , Figure 4 As shown, it mainly includes the first standard hole 101, the second standard hole 102, the third standard hole 103, the fourth standard hole 104, the fifth standard hole 105, the sixth standard hole 106, the sealing ring groove 107, the first standard two-point threaded hole 108, the second standard two-point threaded hole 111, the third standard two-point threaded hole 113, the fourth standard two-point threaded hole 115, the first standard three-point threaded hole 109, the second standard three-point threaded hole 110, the third standard three-point threaded hole 112, and the fourth standard three-point threaded hole 114.

[0091] The third standard two-part threaded hole 113, which is the fluid inlet, and the first standard two-part threaded hole 108, which is the fluid outlet, can form the first cooling circuit;

[0092] The second standard two-part threaded hole 111, which is the fluid inlet, and the fourth standard two-part threaded hole 115, which is the fluid outlet, can form the second cooling circuit.

[0093] The first standard three-part threaded hole 109, which is the fluid inlet, and the third standard three-part threaded hole 112, which is the fluid outlet, can form the third cooling circuit;

[0094] The fourth standard three-part threaded hole 114 serves as the fluid inlet, and together with the second standard three-part threaded hole 110 as the fluid outlet, they can form the fourth cooling circuit.

[0095] Its first cooling circuit and second cooling circuit can be used in parallel. The first circuit can be opened and the second circuit can be closed through the inlet ball valve 6 and the outlet ball valve 11; or the second circuit can be opened and the first circuit can be closed. This is used to enable the cooling medium to enter the immersion container laterally or longitudinally and flow out, reduce the dead zone of the cooling medium flow and promote the circulation of fluid in the immersion container.

[0096] Similarly, the third and fourth cooling circuits can be used in parallel. The third circuit can be opened and the fourth circuit closed, or the fourth circuit can be opened and the third circuit closed, through the inlet ball valve 6 and the outlet ball valve 11. This is used to allow the cooling medium to enter the immersion container laterally or longitudinally and flow out.

[0097] The main difference between the first and second cooling circuits and the third and fourth cooling circuits lies in the different diameters of the connecting pipes, which can be used to assess the impact of different inlet and outlet pipes on the thermal management system.

[0098] The fluid inlet’s first standard three-part threaded hole 109, second standard two-part threaded hole 111, third standard two-part threaded hole 113 and fourth standard three-part threaded hole 114 are characterized by their lower edges meeting the bottom of the inner surface of the immersion container 7, so that the medium in the immersion container 7 can be completely discharged by liquid level difference in other working conditions such as changing the cooling medium or maintenance.

[0099] Container end cap 300 Figure 5 As shown, it mainly includes the first end cap standard hole 301, the second end cap standard hole 302, the third end cap standard hole 303, the fourth end cap standard hole 304, the fifth end cap standard hole 305, the sixth end cap standard hole 306, the end cap sealing ring groove 307, the first end cap standard two-point threaded hole 308, the second end cap standard two-point threaded hole 309, the third end cap standard two-point threaded hole 310, the fourth end cap standard two-point threaded hole 311, the end cap intermediate hole 312, and the standard M20 threaded hole 313.

[0100] The container body 100 and the rubber sealing ring 200 are fixedly connected by adhesive through the sealing ring groove 107.

[0101] The container body 100 and the container end cap 300 are fixedly connected by six standard bolts through the first standard hole 101, the second standard hole 102, the third standard hole 103, the fourth standard hole 104, the fifth standard hole 105, the sixth standard hole 106, and the first end cap standard hole 301, the second end cap standard hole 302, the third end cap standard hole 303, the fourth end cap standard hole 304, the fifth end cap standard hole 305, and the sixth end cap standard hole 306.

[0102] A rubber sealing ring 200 is provided between the container body 100 and the container end cap 300 to ensure a sealed connection.

[0103] The first end cap 308, the second end cap 309, the third end cap 310, and the fourth end cap 311 on the container end cap can be connected to pressure sensor 10, temperature sensor 9, and outlet ball valve 11, etc., according to actual needs.

[0104] M20 threaded hole 313 is used to connect the gland head, and to lead the circuit inside the immersion container 7 to the charge / discharge machine 13 and the data acquisition unit 14.

[0105] Example 2, as Figure 6 As shown, the temperature feedback control method for the immersion thermal management platform provided in this embodiment of the invention includes:

[0106] S1, the immersion cooling medium is injected into the high and low temperature water tank 1, and a constant temperature cooling medium of 25°C is obtained.

[0107] S2, the constant temperature cooling medium flows in through the low temperature inlet of plate heat exchanger 2, flows out through the low temperature outlet and enters gear pump 3. PLC programmable controller 15 controls the speed of gear pump 3 to obtain the initial flow rate. Q 0.

[0108] S3, the constant temperature cooling medium is transported by gear pump 3 through gear flow meter 4, and flows according to the preset initial flow rate. Q 0 enters the immersion container 7 via the pressure transmitter 5 and the opened inlet ball valve 6.

[0109] S4, with the outlet ball valve 11 in the closed state, when the height of the cooling medium in the immersion container 7 exceeds the height of the battery, the outlet ball valve 11 is opened. At this time, the charge / discharge machine 13 is turned on and charging / discharging operations are performed.

[0110] S5, the cooling medium flows through the outlet ball valve 11, enters the heat inlet of the plate heat exchanger 2 through the pipeline, and after the cooling medium dissipates heat through the plate heat exchanger 2, it flows out through the heat outlet and flows back to the high and low temperature water tank 1 through the inlet, forming a circulating cooling loop.

[0111] S6, after a stable circulating cooling loop is formed, the PLC programmable controller 15 controls the speed of gear pump 3 to obtain normal cooling flow. Q n .

[0112] S7, maintain normal cooling flow. Q n This forms a normal operating cycle cooling loop; the data acquisition unit 14 collects the flow rate, battery center point temperature, cooling medium temperature in the immersion container, and pressure in the immersion container in real time, and performs cooling medium temperature feedback zoning control based on the real-time temperature of the energy storage battery 8 using a preset temperature feedback zoning control algorithm.

[0113] In step S7, the data acquisition unit 14 collects the flow rate, battery center point temperature, cooling medium temperature in the immersion container, and pressure in the immersion container in real time. Based on the real-time temperature of the energy storage battery 8, it performs cooling medium temperature feedback zoning control using a preset temperature feedback zoning control algorithm, including:

[0114] During the preparation phase of the circulating cooling circuit, a constant-temperature cooling medium (25°C) is obtained. The flow rate and speed of gear pump 3 during this preparation phase are set at the prepared flow rate. Q 0. This example demonstrates preparing the flow rate at a rotation speed of 3000 rpm. Q The flow rate is 1.98 L / min. If the immersion container height is greater than the battery height, the outlet ball valve 11 opens, and the PLC programmable controller 15 controls the flow to the normal cooling flow rate. Q n This example is based on an operating speed of 1000 rpm and normal cooling flow rate. Q n The flow rate should be 0.66 L / min; otherwise, continue with the flow preparation process. Q 0, outlet ball valve 11 remains closed.

[0115] Data acquisition unit 14 acquires the battery temperature in real time from temperature sensor 9. T cell The temperature of the cooling medium inside the container is obtained from the PT100 temperature sensor 12. T coolant The PLC programmable controller 15 is used to acquire signals from temperature sensor 9 and PT100 temperature sensor 12 in real time, and process them to obtain the target control temperature difference Δ of the battery. T .

[0116] If the energy storage battery temperature T cell <15℃ and the temperature of the cooling medium inside the container T coolant If the temperature is ≥25℃, the high and low temperature water tank 1 will heat the coolant to 30℃, and the cooling flow rate will be the normal cooling flow rate. Q n This example is executed at a rotational speed of 1000 rpm with an initial flow rate. Q n The flow rate is 0.66 L / min, combined with the target control temperature difference Δ of the battery. T Flow rate adjustment in real time; if the temperature of the cooling medium inside the immersion container is... T coolant At temperatures below 25℃, a medium cooling flow rate should be applied. Q m This example is for an operating speed of 2000 rpm and a medium cooling flow rate. Q m The flow rate is 1.32 L / min, combined with the target control temperature difference Δ of the battery. T Real-time flow rate adjustment. Low-temperature preheating function.

[0117] If the energy storage battery temperature is 15℃ ≤ T cellIf the temperature is below 35℃, the high and low temperature water bath will be maintained at a constant temperature of 25℃. If the target control temperature difference of the battery is Δ... T <1℃, operating speed 500 rpm, small cooling flow rate Q s The flow rate is 0.33 L / min. If the target control temperature difference of the energy storage battery is 1℃ ≤ Δ T <2℃, operating speed 2000 rpm, medium cooling flow rate Q m The flow rate is 1.32 L / min. If the target control temperature difference Δ of the energy storage battery... T ≥2℃, operating speed 4000 rpm, large cooling flow rate Q h The flow rate is 2.64 L / min. It achieves room temperature uniformity.

[0118] If the energy storage battery temperature is 35℃ ≤ T cell If the temperature is below 100℃, the high and low temperature water bath temperature is controlled at 20℃, and the gradient pressurization mode is activated. Q gradient = Q m + α ·( T cell -35) 2 In the formula α Gain coefficient for flow regulation ( α =0.1 L / min·℃ 2 This reflects the non-linear growth of cooling intensity requirements, meaning that once the battery temperature exceeds 35°C, the required cooling capacity increases non-linearly for every 1°C increase. Q gradient The output flow rate after gradient pressurization. Q m Medium cooling flow rate T cell For battery temperature; if the temperature of the cooling medium inside the container... T c >35℃, trigger pulse jet (10s) Q h +10s Q s (Circulation). To achieve high-temperature cooling function.

[0119] If the energy storage battery temperature T cell ≥ 100℃ or pressure change rate within the immersion container dp / dt If the pressure is >50 kPa / s, the cooling medium in the water tank will be rapidly cooled to 5°C (liquid nitrogen can be injected into the water tank for auxiliary cooling), and the cooling flow rate will be locked. Qh,max This example demonstrates setting the rotation speed to 6000 rpm and locking the flow rate. Q h,max The flow rate is 3.96 L / min. Additionally, the liquid nitrogen injection port / system or perfluorohexanone injection port / system configured in the high and low temperature water bath 1 can be used to achieve thermal runaway suppression.

[0120] Another example is a preset temperature feedback zoning control algorithm, which includes:

[0121] The first step is data acquisition and preprocessing.

[0122] Sampling frequency: The following data are collected synchronously every 1 second:

[0123] (1) Battery temperature ( T cell ): Data from 4 temperature sensor matrices (2×2 grid distribution), weighted average (center point of battery surface weight 0.35, edge points of positive and negative electrodes weight 0.15).

[0124] (2) Cooling medium temperature ( T c ): 12-PT100 sensor data, combined with historical 10-second data, to perform an exponential moving average filter.

[0125] (3) Pressure data ( p Real-time monitoring of the pressure change rate inside the immersion container ( dp / dt (This is used to help predict the risk of thermal runaway.)

[0126] The second step is to develop a zoned state machine and a multi-level temperature zoned control strategy.

[0127] Control core formula:

[0128] Flow regulation: Q corrector = K p · Δ T + K i · ∫ Δ T dt + K d · d (Δ T ) / dt;

[0129] In the formula: Δ T Δ represents the temperature difference between the battery temperature and the target control temperature. T = T cell -T target ; T target To control the target temperature of energy storage batteries, Q corrector The corrected flow rate for the target cooling medium. K p This is the proportionality coefficient. K i The coefficient of the integral term, K d The coefficients of the differential term, t For time.

[0130] A multi-level temperature zone control strategy is employed, with PID parameters dynamically adjusted according to the zone. Specifically:

[0131] (1) Low-temperature preheating: Control conditions: T cell <15℃ and T coolant ≥25℃, T coolant To adjust the cooling medium temperature, the following actions are executed: the water tank is heated to 30°C (heating rate 2°C / min) and the flow rate is increased. Q n (speed) n n )+ Q corrector (PID fine-tuning) K p =0.8, K i =0.05); Control conditions: T cell <15℃ and T coolant If the temperature is below 25℃, the following actions will be executed: the water tank temperature will be raised to 30℃ (heating rate 2℃ / min) and the flow rate will be adjusted. Q m (speed) n m )+ Q corrector (PID fine-tuning) K p =0.8, K i =0.05).

[0132] (2) Room temperature: Control conditions: 15℃≤ T cell <35℃, Action Execution: Water tank constant temperature 25℃, dynamic flow grading; when Δ T <1℃: Q s (speed) ns When 1℃≤Δ T <2℃: Q m (speed) n m ), when Δ T ≥2℃: Q h (speed) n h ).

[0133] (3) High-temperature cooling: Control conditions: T cell ≥35℃, Action: Cool the water tank to 20℃ (cooling rate 3℃ / min), activate gradient pressurization mode: Q gradient = Q m + g ·( T cell -35) 2 In the formula, g Gain coefficient for flow regulation ( g =0.1 L / min·℃ 2 );like T c >35℃, trigger pulse jet (10s) Q h +10s Q s cycle).

[0134] (4) Thermal runaway suppression: Control conditions: T cell ≥100℃ or dp / dt >50 kPa / s, Action: Rapidly cool the water tank to 5℃ (liquid nitrogen can be injected into the water tank for auxiliary cooling), flow rate lock. Q h,max (speed) n h,max Flame retardant additives are injected.

[0135] in, T coolant The temperature of the cooling medium inside the immersion container is obtained from the 12-PT100 temperature sensor. Q The flow rate of gear pump 3 is (L / min). Q 0 represents the prepared flow rate (L / min). Q n This represents the normal cooling flow rate (L / min). Q s For low cooling flow rate (L / min). Qm It has a medium cooling flow rate (L / min). Q h It has a large cooling flow rate (L / min). Q h,max To lock the flow rate (L / min), n n The normal cooling flow rate is the gear pump speed (rpm). n s The speed (rpm) of the gear pump with low cooling flow rate. n m The speed (rpm) of the gear pump with medium cooling flow rate. n h The speed (rpm) of the high-flow-rate gear pump. n h,max To lock the flow rate, the gear pump speed (rpm) is set.

[0136] The flow rate of gear pump 3 is determined by its own mechanical structure parameters and rotational speed, which satisfy the following:

[0137] Q = K * D *2 m * B * n *10 -6；

[0138] in, K This is a correction factor, typically taken as 1.05 to 1.15, and needs to be adjusted according to the actual gear pump. D The pitch circle diameter is in mm. m Modulus (mm); B Tooth width (mm); n The value is the rotational speed (rpm).

[0139] In this implementation example, the flow rate and speed of gear pump 3 satisfy the following: Q =6.6×10 -4 * n ,in n The value is the rotational speed (rpm).

[0140] Another example is that after executing the partition state machine and multi-level temperature partition control strategy, intelligent switching of the cooling loop is also required.

[0141] During the execution of the example, the first and second cooling circuits can be used in parallel. The first cooling circuit can be periodically (e.g., every minute) opened via the inlet ball valve 6 and closed via the outlet ball valve 11; or the second cooling circuit can be opened while the first cooling circuit is closed. This allows the cooling medium to enter and exit the immersion container laterally or longitudinally, reducing dead zones in the cooling medium flow and promoting its circulation within the immersion container. Similarly, the third and fourth cooling circuits can be used in parallel. The third cooling circuit can be periodically (e.g., every minute) opened via the inlet ball valve 6 and closed via the outlet ball valve 11; or the fourth cooling circuit can be opened while the third cooling circuit is closed. This allows the cooling medium to enter and exit the immersion container laterally or longitudinally.

[0142] For example, intelligent switching of cooling circuits includes:

[0143] (1) Switch the circuit combination every 60 seconds (switch from 1st cooling circuit on / 2nd cooling circuit off to 2nd cooling circuit on / 1st cooling circuit off; or switch from 3rd cooling circuit on / 4th cooling circuit off to 4th cooling circuit on / 3rd cooling circuit off).

[0144] (2) Based on the standard deviation of four temperature fields, including the positive and negative tabs of the battery and the two central large surfaces. σ Dynamic adjustment cycle:

[0145] like σ >2℃: Switching cycle shortened to 30s;

[0146] like σ <0.5℃: Switching cycle extended to 120s.

[0147] (3) Pipe diameter selection logic:

[0148] Low-viscosity coolants (such as deionized water and perfluoroolefins) should preferably use two-part piping (circuit 1 / 2).

[0149] High-viscosity coolant (such as silicone oil) is automatically switched to the three-way piping (the third / fourth loop).

[0150] To further illustrate the effects of the embodiments of the present invention, the following experiments were conducted.

[0151] For a single 280 Ah lithium iron phosphate prismatic energy storage battery continuously discharged at 1C rate for 1 hour (ambient temperature 25℃), a detailed comparative analysis of two cooling technologies was conducted, and the comparison of key indicators is shown in Table 1.

[0152] Table 1 Comparison of Core Indicators

[0153]

[0154] like Figure 7 The figure shows the dynamic process of immersion flow adaptive adjustment of cooling medium flow rate. During the 0-5 min period: low cooling flow rate (0.33 L / min); Δ was detected at 12 min. T =1.8℃, flow rate increases to medium cooling flow rate (1.32 L / min); at 28 min, medium temperature rise triggers, pulse large cooling flow rate begins (2.64 L / min / 10 s); at 45 min, temperature stabilizes, flow rate drops back to medium cooling flow rate; at 55 min, temperature rises at the end of discharge, continues to maintain medium cooling flow rate.

[0155] This invention's immersion-type solution exhibits precise temperature control, possesses dynamic response capabilities through adaptive flow adjustment, and uniquely maintains the hotspot temperature below 30°C, while integrating thermal runaway suppression functionality. T cell (Automatically switches to 5℃ rapid cooling mode when the temperature exceeds 100℃).

[0156] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A temperature feedback control method for an immersion thermal management platform, the method comprising: The method comprises the following steps: S1, immerse the cooling medium into the high-low temperature water tank, and obtain the constant temperature cooling medium at room temperature 25℃; S2, the constant temperature cooling medium flows into through the low temperature inlet of the plate heat exchanger, flows out through the low temperature outlet and enters the gear pump, and the PLC programmable controller controls the rotation speed of the gear pump to obtain the initial flow rate Q0; S3, the constant temperature cooling medium is transported through the gear pump, and enters the immersion container according to the pre-set initial flow rate Q0 through the pressure transmitter and the opened inlet ball valve; S4, the outlet ball valve is in a closed state, and when the cooling medium height in the immersion container exceeds the energy storage battery height, the outlet ball valve is opened; the charging and discharging machine is opened, and the charging and discharging working condition is carried out; S5, the cooling medium flows through the outlet ball valve, enters the plate heat exchanger through the pipeline, and flows out through the hot outlet after the cooling medium is cooled through the plate heat exchanger, and then flows back to the high-low temperature water tank through the high-low temperature water tank inlet, to form a circulating cooling loop; S6, after forming the stable circulating cooling loop, the PLC programmable controller controls the rotating speed of the gear pump to obtain normal cooling flow Q n ; S7, keep performing normal cooling flow Q n Form a normal working cycle cooling circuit; a data collector collects flow, battery center point temperature, cooling medium temperature in the immersion container, and pressure in the immersion container in real time, and performs cooling medium temperature feedback partition control according to the real-time temperature of the energy storage battery and by using a preset temperature feedback partition control algorithm. In step S7, the temperature feedback partition control algorithm based on the preset temperature feedback partition control algorithm is used for cooling medium temperature feedback partition control, which comprises: Data collector collects battery temperature T acquired by temperature sensor in real time cell and cooling medium temperature T in container acquired by PT100 temperature sensor coolant PLC programmable controller is used to collect temperature sensor signal and PT100 temperature sensor signal in real time and to process target control temperature difference ΔT of battery If the energy storage battery temperature T cell <15℃ and the cooling medium temperature T coolant ≥25℃, the flow rate is adjusted in real time in combination with the target control temperature difference ΔT of the energy storage battery to complete low-temperature preheating. If the temperature of the energy storage battery is 15℃≤T cell <35℃, adjust the gear pump rotation speed and the coolant flow rate to complete the normal temperature equalization; If the temperature of the energy storage battery is 35℃≤T cell <100℃, start the gradient pressurization mode of the gear pump to complete high-temperature cooling; If the energy storage battery temperature T cell ≥ 100℃ or the pressure change rate dp / dt in the immersion container > 50 kPa / s, the cooling liquid flow executes the lock flow Q h,max , and the thermal runaway suppression is completed. The PLC programmable controller (15) is based on the preset temperature feedback partition control algorithm of the energy storage battery (8), the target control temperature difference of the energy storage battery (8) and the cooling medium temperature in the immersion container (7), which is used for temperature feedback control of the high-low temperature water tank (1) and the rotation speed of the gear pump (3), so that the best cooling medium temperature and flow rate are obtained, and intelligent switching of the cooling loop is further carried out, which comprises: The first cooling loop and the second cooling loop are used in parallel, and periodically pass through the inlet ball valve (6) and the outlet ball valve (11) to realize the conduction of the first cooling loop and the closing of the second cooling loop; or the conduction of the second cooling loop and the closing of the first cooling loop; for cooling medium to enter the immersion container internally and flow out laterally or longitudinally, the third cooling loop and the fourth cooling loop are used in parallel, and periodically pass through the inlet ball valve (6) and the outlet ball valve (11) to realize the conduction of the third cooling loop and the closing of the fourth cooling loop; or the conduction of the fourth cooling loop and the closing of the third cooling loop; to realize the cooling medium to enter the immersion container internally and flow out laterally or longitudinally.

2. The temperature feedback control method of the immersion thermal management platform of claim 1, wherein, In the low-temperature preheating, the high-low temperature tank heats the cooling liquid to 30℃, and the cooling flow executes the normal cooling flow Q n And the flow is adjusted in real time in combination with the target control temperature difference ΔT of the energy storage battery; the rotation speed is 1000 rpm, the initial flow Q n is 0.66 L / min; If the temperature T of the cooling medium in the immersion vessel is coolant <25°C, the cooling flow is executed with a medium cooling flow Q m , the rotational speed is executed with 2000 rpm, the medium cooling flow Q m is 1.32 L / min.

3. The temperature feedback control method of the immersion thermal management platform of claim 1, wherein, In the process of completing the normal temperature, the high and low temperature water tank keeps normal temperature 25℃; if the target control temperature difference of the energy storage battery ΔT <1℃, execute the speed 500rpm, small cooling flow Q s 0.33L / min; If the target control temperature difference of the energy storage battery is 1℃≤ΔT<2℃, execute the rotation speed of 2000rpm, the medium cooling flow rate Q m is 1.32L / min; If the battery target control temperature difference ΔT ≥ 2℃, execute the rotation speed 4000 rpm, and the large cooling flow rate Q h is 2.64 L / min.

4. The temperature feedback control method of the immersion thermal management platform of claim 1, wherein, In the high-temperature cooling, the temperature of the high- and low-temperature water tanks is controlled to be 20℃, and the gradient pressurization mode of the gear pump is started: Q gradient = Q m + α·(T cell - 35) 2 , wherein α is a gain coefficient of flow regulation, α = 0.1 L / min·℃ 2 ; Q gradient is the output flow after the gradient pressurization, Q m is the medium cooling flow, and T cell is the battery temperature. If the temperature T of the cooling medium in the immersion vessel is greater than 35°C, a pulse jet is triggered, which is 10 seconds Q c > 35°C, a pulse jet is triggered, which is 10 seconds Q h + 10 seconds Q s cycle; In the heat run-away inhibition, the cooling medium in the high-low temperature water tank is rapidly cooled to 5℃, and the cooling flow is executed to lock the flow Q h,max , the rotation speed is executed to 6000 rpm, and the lock flow Q h,max is 3.96 L / min; the liquid nitrogen injection interface / system or perfluorohexone injection interface / system configured by the high-low temperature water tank is used for heat run-away inhibition.

5. The temperature feedback control method of the immersion thermal management platform of claim 1, wherein, Target cooling medium modified flow includes: Q corrector = K p · ΔT + K i · ∫ΔT dt + K d · d(ΔT) / dt; where ΔT is the temperature difference between the battery temperature and the target control temperature, ΔT = T cell -T target ; T target is the target control temperature of the energy storage battery, Q corrector is the target cooling medium corrected flow, K p is the proportional term coefficient, K i is the integral term coefficient, K d is the differential term coefficient, and t is time.

6. An immersion thermal management platform, characterized by, The platform implements the temperature feedback control method of the immersion heat management platform according to any one of claims 1-5, and the platform comprises a high-low temperature water tank (1), a standard beaker interface connected to the outlet of the high-low temperature water tank (1), and a plate heat exchanger (2) connected to the low temperature inlet of the plate heat exchanger (2) through a two-part standard specification pipeline; Cooling medium flows through the plate heat exchanger (2) through the low temperature outlet, and the low temperature outlet is connected with the inlet of the gear pump (3) through the pipeline; the fluid flows out through the outlet after working through the gear pump (3), flows through the fluid pipeline into the inlet of the gear flowmeter (4), flows out through the outlet of the gear flowmeter (4), passes through the pressure transmitter (5), flows through the inlet ball valve (6) into the immersion container (7); the energy storage battery (8) is placed in the immersion container (7), and the cooling medium in the immersion container (7) flows through the outlet ball valve (11) through the pipeline; further through the pipeline into the high temperature inlet of the plate heat exchanger (2), flows through the plate heat exchanger (2) through the high temperature outlet, and returns to the high-low temperature water tank (1) through the inlet of the high-low temperature water tank (1).

7. The immersion thermal management platform of claim 6, wherein, The high-low temperature water tank (1) is provided with a liquid nitrogen injection interface / system and a perfluorohexanone injection interface / system; A plurality of temperature sensors (9) of the same specification are distributed at the tab of the positive and negative electrodes of the energy storage battery (8) and the center of the large face of the energy storage battery (8), and are used to collect the temperatures of the positive and negative electrodes of the energy storage battery (8) and the centers of the two large faces; The PT100 temperature sensor (12) measures the temperature of the cooling medium in the immersion container (7); The charge-discharge machine (13) is used to simulate different working conditions of charging and discharging of the energy storage battery (8); The data collector (14) is connected with the gear flowmeter (4) signal, the pressure transmitter (5) signal, the temperature sensor (9) signal, the pressure sensor (10) signal and the PT100 temperature sensor (12) to collect electrical signals through a circuit; The PLC programmable controller (15) is used to obtain the temperature sensor (9) signal and the PT100 temperature sensor (12) signal in real time, and based on the preset energy storage battery (8) temperature, the energy storage battery (8) target control temperature difference and the immersion container (7) cooling medium temperature feedback partition control algorithm, the temperature feedback control high-low temperature water tank (1) temperature and gear pump (3) speed are used to obtain the best cooling medium temperature and flow.

8. The immersion thermal management platform of claim 6, wherein, The immersion container (7) comprises a container main body (100), a rubber sealing ring (200) and a container end cover (300); The third standard two-part threaded hole (113) in the container main body (100) is a cooling medium inlet and the first standard two-part threaded hole (108) is a cooling medium outlet to form a first cooling circuit; The second standard two-part threaded hole (111) in the container main body (100) is a cooling medium inlet and the fourth standard two-part threaded hole (115) is a cooling medium outlet to form a second cooling circuit; The first standard three-part threaded hole (109) in the container main body (100) is a cooling medium inlet and the third standard three-part threaded hole (112) is a cooling medium outlet to form a third cooling circuit; The fourth standard three-part threaded hole (114) in the container main body (100) is a cooling medium inlet and the second standard three-part threaded hole (110) is a cooling medium outlet to form a fourth cooling circuit.

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