Battery flow heat management system and method for marine environment all-weather energy storage platform

Abstract

The invention belongs to the technical field of energy storage batteries, and particularly relates to a battery flow heat management system and method for a marine environment all-weather energy storage platform. The thermal management system comprises a plurality of energy storage prefabricated cabins, and a plurality of energy storage battery modules are distributed in each energy storage prefabricated cabin; the liquid flow cold plates are used for exchanging heat with the energy storage battery modules, and the liquid flow cold plates are arranged below the energy storage battery modules in a one-to-one correspondence mode; the inverter cabin is used for carrying out direct current-alternating current conversion in the inverter cabin and converting the electric energy output by the energy storage battery module into alternating current for external power supply; the heat exchanger is positioned in the seawater and is used for exchanging heat with the seawater; the submersible pump is located in the seawater and used for pumping the liquid flow medium in the heat exchanger; and the battery liquid flow pipe network loop enables the liquid flow medium to circulate in a loop consisting of the liquid flow cold plate, the heat exchanger and the submersible pump. A seawater liquid flow heat exchange structure is provided for an ocean wind and light power generation energy storage battery system, and scale prevention of seawater desalination heat exchange equipment can be achieved.

Description

Technical Field

[0001] This application belongs to the field of energy storage battery technology, and specifically relates to a battery liquid flow thermal management system and method for marine all-weather energy storage platforms. Background Technology

[0002] Currently, most energy storage battery systems used in marine environments employ air as the thermal management medium. However, the climate of marine, island, and coastal estuary areas is characterized by high humidity and high salinity. Due to the high humidity and salinity of sea breezes, this air supply method easily causes condensation on the batteries, leading to water film formation on components, corrosion of joints, short circuits, and increased equipment failure rate. Increased salinity also accelerates the electrochemical corrosion of metal materials, posing challenges to the safe and stable operation of energy storage batteries.

[0003] The liquid flow heat management system exchanges heat through contact between a cold plate and the battery system. Compared to air circulation, liquid flow circulation avoids direct contact with high-humidity, high-salt external air, reducing the risk of corrosion to the battery system and metal components. Furthermore, from an economic perspective, using seawater on-site as the heat exchange medium can further reduce initial investment and maintenance costs, ensuring long-term operational reliability.

[0004] However, seawater is mainly composed of NaCl salt solution, which easily causes corrosion of pipes and heat exchange components, as well as biofouling. Therefore, there is an urgent need for a battery liquid flow thermal management system and method for marine all-weather energy storage platforms.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] In order to overcome the above-mentioned problems in the prior art, this application proposes a liquid flow heat management system and method using seawater to provide a system for heat exchange of energy storage battery modules for marine wind and solar power generation, and can also achieve scale prevention of seawater desalination liquid flow heat exchange equipment.

[0007] A battery liquid flow thermal management system for a marine all-weather energy storage platform includes: Multiple energy storage prefabricated modules are placed on an offshore platform, and each energy storage prefabricated module contains multiple energy storage battery modules; The liquid flow cooling plate is used for heat exchange with the energy storage battery module. Each energy storage battery module has a corresponding liquid flow cooling plate installed below it. The inverter compartment is where DC-AC conversion is performed, converting the electrical energy output from the energy storage battery module into AC power for external supply. A heat exchanger, located in seawater, is used to exchange heat with seawater; Submersible pumps, which are located in seawater, are used to pump liquid media in heat exchangers; The battery fluid flow network loop circulates the fluid medium in a loop consisting of a fluid flow cooling plate, a heat exchanger, and a submersible pump.

[0008] In some embodiments of this application, multiple heat exchangers are configured in parallel, including a first heat exchanger, a second heat exchanger, and a third heat exchanger. Depending on the depth of the seawater where the heat exchangers are located, the depth of the seawater where the first heat exchanger is located < the depth of the seawater where the second heat exchanger is located < the depth of the seawater where the third heat exchanger is located. In summer, as the seawater depth increases, the seawater temperature gradually decreases, and the seawater temperature at the depth of the first heat exchanger > the seawater temperature at the depth of the second heat exchanger > the seawater temperature at the depth of the third heat exchanger. In winter, as the seawater depth increases, the seawater temperature is higher than the ambient air temperature.

[0009] In some embodiments of this application, the first heat exchanger, the second heat exchanger, and the third heat exchanger should each be connected in series with a first submersible pump, a second submersible pump, and a third submersible pump; the end of the third submersible pump away from the third heat exchanger is connected between the second heat exchanger and the second submersible pump, and the end of the third heat exchanger away from the third submersible pump is connected to the end of the second heat exchanger away from the second submersible pump; the end of the second submersible pump away from the second heat exchanger is connected to the pipeline between the first submersible pump and the first heat exchanger, and the end of the second heat exchanger away from the second submersible pump is connected to the end of the first heat exchanger away from the first submersible pump.

[0010] In some embodiments of this application, the first heat exchanger is located in seawater at a depth of 0-10 meters, the second heat exchanger is located in seawater at a depth of 10-30 meters, and the third heat exchanger is located in seawater at a depth greater than 30 meters.

[0011] In some embodiments of this application, under summer operating conditions, the seawater temperature where the first heat exchanger is located is in the range of 20-25°C, the seawater temperature where the second heat exchanger is located is in the range of 15-20°C, and the seawater temperature where the third heat exchanger is located is in the range of 10-15°C.

[0012] In some embodiments of this application, under winter operating conditions, the seawater temperature where the first heat exchanger is located is 10-15°C. Seawater has a large specific heat capacity, and its temperature decreases slowly. However, as the depth increases, the temperature decreases, but there is a shallow transition zone, which is suitable for preheating the battery module in winter.

[0013] In some embodiments of this application, a submersible pump pumps a liquid medium into a liquid flow network. The liquid flow network enters a liquid flow cold plate through a cold plate inlet, where it exchanges heat with the energy storage battery module in a non-contact manner. After heat exchange, the liquid medium carrying battery heat flows out through the cold plate outlet and returns to the heat exchanger. In the heat exchanger, the liquid medium exchanges heat with seawater outside the heat exchanger and circulates according to actual needs.

[0014] In some embodiments of this application, multiple prefabricated energy storage compartments are spaced apart, and the liquid flow cooling plate corresponding to the energy storage battery module in each prefabricated energy storage compartment is connected in parallel with the liquid flow cooling plate corresponding to the energy storage battery module in the adjacent prefabricated energy storage compartment. The liquid flow medium pumped from the submersible pump flows through the liquid flow pipeline network and is diverted into the multiple liquid flow cooling plates corresponding to the multiple energy storage battery modules in the multiple prefabricated energy storage compartments to exchange heat with the energy storage battery modules. After heat exchange, the liquid flow medium flows through the outlet of the cooling plate to converge into the battery liquid flow pipeline network loop to exchange heat with the multiple prefabricated energy storage compartments and ensure that the energy storage battery modules operate within a suitable temperature range.

[0015] In some embodiments of this application, an exhaust valve is provided at the end of the liquid flow network and is arranged obliquely upward, so that the air carried in the liquid flow medium can be discharged through the exhaust valve at the end.

[0016] In some embodiments of this application, the fluid medium is seawater, and seawater is used as a natural fluid medium.

[0017] In some embodiments of this application, when the liquid flow medium is seawater, a permeable membrane is used to desalinate the seawater, thereby solving the corrosion problem of the liquid flow pipeline network and the liquid flow cold plate.

[0018] In some embodiments of this application, the external supply of electrical energy converted by the inverter refers to providing electricity to the oil drilling equipment of the offshore platform and / or the accommodation of the offshore platform's personnel.

[0019] In other embodiments of this application, a battery liquid flow thermal management method for a marine all-weather energy storage platform is also provided, based on the above-described thermal management system: Under summer operating conditions, the following steps are included: The system determines whether the temperature of the energy storage battery module exceeds 45°C. If it does, a third heat exchanger is used to exchange heat with the surrounding seawater, i.e., deep seawater heat exchange mode. If the temperature of the energy storage battery module is between 35-45°C, a second heat exchanger is used to exchange heat with the seawater, i.e., mid-level seawater heat exchange mode. If the battery temperature is between 25-35°C, a first heat exchanger is used to exchange heat with the seawater, i.e., shallow seawater heat exchange mode. The above three methods can be used in conjunction with each other and activated simultaneously for synergistic heat exchange. Under winter operating conditions, the following steps are included: First, the air temperature is determined. When the ambient temperature is <5℃, the shallow seawater heat exchange mode is activated; otherwise, the mode is stopped. When the shallow seawater heat exchange mode is activated, the temperature of the energy storage battery module is determined. When the battery temperature is <10℃, the flow rate of the liquid medium is increased until the energy storage battery module reaches the preset temperature, and then the shallow seawater heat exchange mode is stopped.

[0020] In some embodiments of this application, based on the vertical distribution characteristics of seawater temperature, seawater is directly used as a natural cold source or heat source to realize heat exchange of the marine platform energy storage power station; different working modes are realized according to different seawater depths and temperatures: deep seawater heat exchange mode, mid-level seawater heat exchange mode, and shallow seawater heat exchange mode.

[0021] In some embodiments of this application, the thermal management method specifically refers to the following under summer operating conditions: When the temperature of the energy storage battery module is greater than 25°C and less than 35°C, the shallow seawater heat exchange mode is activated. At this time, the third and second submersible pumps are turned off, and only the first submersible pump is turned on. When the first submersible pump pumps in the liquid medium, the liquid medium enters the liquid flow network. The liquid medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It flows out through the cold plate outlet and enters the liquid flow network, and then enters the first heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange. When the temperature of the energy storage battery module is greater than 35℃ but less than 45℃, the middle layer seawater heat exchange mode is activated. At this time, the third submersible pump and the first submersible pump are turned off, and only the second submersible pump is turned on. The second submersible pump pumps in the liquid flow medium, which is pumped into the liquid flow pipeline. The liquid flow medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It flows out through the cold plate outlet and enters the liquid flow pipeline, and then enters the second heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange. When the temperature of the energy storage battery module exceeds 45°C, the deep seawater heat exchange mode is activated. At this time, the first and second submersible pumps are turned off, and only the third submersible pump is activated. The third submersible pump pumps in the liquid flow medium, which enters the liquid flow pipeline network. The liquid flow medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It then flows out through the cold plate outlet and enters the liquid flow pipeline network, and then enters the third heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange.

[0022] In some embodiments of this application, after the first, second, and third submersible pumps pump in the liquid medium, the corresponding submersible pumps can be shut down as needed.

[0023] Compared with the prior art, this application has at least the following technical effects: (1) This application proposes a liquid flow heat management system and method for seawater, which provides a liquid flow heat exchange system for marine wind and solar power energy storage battery system using seawater at different depths, and can achieve scale prevention of seawater desalination heat exchange system.

[0024] (2) The fluid medium in this application can be seawater, which is readily available locally and more convenient, reducing the maintenance cost of the offshore platform's thermal management system and eliminating the need for fluid replenishment. Offshore platforms are far from the mainland, making maintenance extremely inconvenient, such as requiring personnel to check the tides before landing. Therefore, using seawater as the medium locally can reduce the need for subsequent maintenance after coolant replacement and replenishment, reduce the number of times offshore platform maintenance personnel need to land, and lower system maintenance costs.

[0025] (3) In summer, the low temperature of deep-sea water provides a large temperature difference for battery heat exchange, while utilizing natural cold sources has excellent energy-saving and consumption-reducing effects. In traditional liquid flow thermal management, after the coolant absorbs heat from the battery, a cold source (air conditioning system or heat pump system) is needed to lower the coolant temperature, which increases power consumption. Taking the Qingdao sea area as an example, the seawater temperature has a typical vertical distribution; in winter, there is a transition zone in the shallow seawater, which provides a large temperature difference for the energy storage battery module, which can be used to heat the energy storage battery module and ensure its normal operation in winter.

[0026] (4) This application also includes a permeation membrane desalination device to desalinate seawater and reduce scaling and corrosion problems in liquid flow cold plates and liquid flow pipelines. Attached Figure Description

[0027] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the thermal management system in some embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the thermal management system in some embodiments of this application. Figure 2 ; Figure 3 This is a flowchart illustrating the thermal management method under summer operating conditions in some embodiments of this application. Figure 4 This is a schematic diagram of the thermal management method under winter conditions in some embodiments of this application; Figure 5 This is a schematic diagram of the thermal management system in some embodiments of this application. Figure 3 ; Figure 6 This is a schematic diagram of the thermal management system in some embodiments of this application. Figure 4 .

[0029] Among them, 101, energy storage battery module; 102, liquid flow cooling plate; 103, energy storage prefabricated cabin; 104, battery busbar; 105, signal acquisition harness; 106, inverter cabin; 201, oil drilling equipment; 202, staff dormitory; 203, offshore platform; 204, shallow seawater current; 301, cooling plate inlet; 302, cooling plate outlet; 303, liquid flow pipeline network; 304, exhaust valve; 305, first submersible pump; 306, first heat exchanger; 400, permeate membrane desalination device; 401, mid-level seawater current; 402, second heat exchanger; 403, second submersible pump; 501, deep seawater current; 502, third submersible pump; 503, third heat exchanger. Detailed Implementation

[0030] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of this application, but not all embodiments, and are only used to illustrate this application, and should not be regarded as limiting the scope of this application.

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0033] The following examples, in conjunction with the accompanying drawings, illustrate the concepts. Figures 1-6 This application will be described in further detail.

[0034] A battery liquid flow thermal management system for a marine all-weather energy storage platform includes: Multiple energy storage prefabricated modules 103 are placed on the offshore platform 203, and multiple energy storage battery modules 101 are distributed in each energy storage prefabricated module 103; Liquid flow cooling plate 102 is used for heat exchange with energy storage battery module 101. Each energy storage battery module 101 is provided with a corresponding liquid flow cooling plate 102 below it. The inverter compartment 106 performs DC-AC conversion, converting the electrical energy output from the energy storage battery module 101 into AC power for external supply. A heat exchanger, located in seawater, is used to exchange heat with seawater; Submersible pumps, which are located in seawater, are used to pump liquid media in heat exchangers; The battery fluid flow network 303 circuit allows the fluid medium to circulate in a loop consisting of a fluid flow cooling plate 102, a heat exchanger, and a submersible pump.

[0035] In some embodiments of this application, multiple heat exchangers are configured in parallel, including a first heat exchanger 306, a second heat exchanger 402, and a third heat exchanger 503. Depending on the depth of the seawater where the heat exchangers are located, the depth of the seawater where the first heat exchanger 306 is located is less than the depth of the seawater where the second heat exchanger 402 is located, which is less than the depth of the seawater where the third heat exchanger 503 is located. As the depth of the seawater increases, the temperature of the seawater gradually decreases, with the temperature of the seawater at the depth of the first heat exchanger 306 being greater than the temperature of the seawater at the depth of the second heat exchanger 402 being greater than the temperature of the seawater at the depth of the third heat exchanger 503.

[0036] In some embodiments of this application, the first heat exchanger 306, the second heat exchanger 402, and the third heat exchanger 503 should each be connected in series with a first submersible pump 305, a second submersible pump 403, and a third submersible pump 502; the end of the third submersible pump away from the third heat exchanger 503 is connected between the second heat exchanger 402 and the second submersible pump 403, and the end of the third heat exchanger 503 away from the third submersible pump 502 is connected to the end of the second heat exchanger 402 away from the second submersible pump 403; the end of the second submersible pump 403 away from the second heat exchanger 402 is connected to the pipeline between the first submersible pump 305 and the first heat exchanger 306, and the end of the second heat exchanger 402 away from the second submersible pump 403 is connected to the end of the first heat exchanger 306 away from the first submersible pump 305.

[0037] In some embodiments of this application, shallow ocean currents 204, mid-level ocean currents 401, and deep ocean currents 501 are used to exchange heat with the first heat exchanger 306, the second heat exchanger 402, and the third heat exchanger 503, respectively.

[0038] In some embodiments of this application, the first heat exchanger 306 is located in seawater at a depth of 0-10 meters, the second heat exchanger 402 is located in seawater at a depth of 10-30 meters, and the third heat exchanger 503 is located in seawater at a depth greater than 30 meters.

[0039] In some embodiments of this application, under summer operating conditions, the seawater temperature at the location of the first heat exchanger 306 is in the range of 20-25°C, the seawater temperature at the location of the second heat exchanger 402 is in the range of 15-20°C, and the seawater temperature at the location of the third heat exchanger 503 is in the range of 10-15°C.

[0040] In some embodiments of this application, under winter operating conditions, the seawater temperature at the location of the first heat exchanger 306 is 10-15°C. Seawater has a large specific heat capacity, and its temperature decreases slowly. However, as the depth increases, the temperature decreases, but there is a shallow transition zone, which is suitable for preheating the battery module in winter.

[0041] In some embodiments of this application, a submersible pump pumps the liquid medium into a liquid flow network 303. The liquid flow network 303 enters a liquid flow cold plate 102 through a cold plate inlet 301, where it exchanges heat with the energy storage battery module 101 in a non-contact manner. After heat exchange, the liquid medium carrying battery heat flows out through the cold plate outlet 302 and returns to the heat exchanger. In the heat exchanger, the liquid medium exchanges heat with seawater outside the heat exchanger and circulates according to actual needs.

[0042] In some embodiments of this application, multiple energy storage prefabricated chambers 103 are spaced apart, and the liquid flow cooling plate 102 corresponding to the energy storage battery module 101 in each energy storage prefabricated chamber 103 is connected in parallel with the liquid flow cooling plate 102 corresponding to the energy storage battery module 101 in the adjacent energy storage prefabricated chamber 103. The liquid flow medium pumped from the submersible pump flows through the liquid flow network 303 and is diverted into the multiple liquid flow cooling plates corresponding to the multiple energy storage battery modules 101 in the multiple energy storage prefabricated chambers 103 to exchange heat with the energy storage battery modules 101. After heat exchange, the liquid flow medium flows through the cold plate outlet 302 to the battery liquid flow network 303 loop to exchange heat with the multiple energy storage prefabricated chambers 103 and ensure that the energy storage battery modules 101 operate within a suitable temperature range.

[0043] In some embodiments of this application, the current output from multiple individual cells of the energy storage battery module 101 connected in parallel is collected by the battery bus 104 to form a total output current.

[0044] In some embodiments of this application, an exhaust valve 304 is provided at the end of the liquid flow network 303 and is arranged obliquely upward, so that the air carried in the liquid flow medium can be discharged through the exhaust valve 304 at the end.

[0045] In some embodiments of this application, signals from the energy storage battery module 101, the staff dormitory 202, and the oil drilling rig 201 are acquired via the signal acquisition harness 105. The signals include information such as required power and temperature.

[0046] In some embodiments of this application, the fluid medium is seawater, and seawater is used as a natural fluid medium.

[0047] In some embodiments of this application, when the liquid flow medium is seawater, a permeable membrane is used to desalinate the seawater, thereby solving the corrosion problem of the liquid flow pipeline 303 and the liquid flow cold plate.

[0048] In some embodiments of this application, the liquid medium is replaced with seawater, which is locally sourced. Using seawater as the medium can reduce the maintenance and replenishment of coolant after replacement, reduce the number of times maintenance personnel of the offshore platform 203 need to go ashore, and reduce system maintenance costs. The main substance of seawater is NaCl, which can cause scaling and corrosion to the pipeline and cold plate during long-term operation.

[0049] In the heat exchange process where seawater is the natural liquid medium, there are scaling and corrosion problems on the cold plates and pipe networks. Therefore, seawater needs to be desalinated. Membrane treatment can be used, for example, by adding a permeate membrane desalination device 400 to the inlet side of the first submersible pump 305. The permeate membrane desalination device 400 can be added to the inlet side of the submersible pump as needed.

[0050] In some embodiments of this application, the permeation membrane allows water molecules to pass through while blocking salt ions; it is an asymmetric composite membrane made of polyamide (PA) or cellulose acetate (CA).

[0051] In some embodiments of this application, the external supply of electrical energy converted by the inverter refers to providing electricity to the oil drilling rig 201 of the offshore platform 203 and / or the accommodation of the personnel of the offshore platform 203.

[0052] In other embodiments of this application, based on the above-described thermal management system, a battery liquid flow thermal management method for a marine all-weather energy storage platform is also provided, which includes the following steps under summer operating conditions: The system determines whether the temperature of the energy storage battery module exceeds 45°C. If it does, a third heat exchanger is used to exchange heat with the surrounding seawater, i.e., deep seawater heat exchange mode. If the temperature of the energy storage battery module is between 35-45°C, a second heat exchanger is used to exchange heat with the seawater, i.e., mid-level seawater heat exchange mode. If the battery temperature is between 25-35°C, a first heat exchanger is used to exchange heat with the seawater, i.e., shallow seawater heat exchange mode. The above three methods can be used in conjunction with each other and activated simultaneously for synergistic heat exchange. Under winter operating conditions, the following steps are included: First, the air temperature Ta is determined. When the ambient temperature is <5℃, the shallow seawater heat exchange mode is activated; otherwise, the mode is stopped. When the shallow seawater heat exchange mode is activated, the temperature of the energy storage battery module is determined. When the battery temperature Tb is <10℃, the flow rate of the liquid medium is increased until the energy storage battery module reaches the preset temperature, and then the shallow seawater heat exchange mode is stopped.

[0053] In some embodiments of this application, the flow rate of the liquid medium is increased by increasing the flow rate of the first submersible pump.

[0054] In some embodiments of this application, based on the vertical distribution characteristics of seawater temperature, seawater is directly used as a natural cold source to achieve liquid cooling heat exchange for the marine platform 203 energy storage power station; different working modes are achieved according to different seawater depths and temperatures: deep seawater heat exchange mode, mid-level seawater heat exchange mode, and shallow seawater heat exchange mode.

[0055] In some embodiments of this application, the thermal management method specifically includes: When the temperature of the energy storage battery module 101 is greater than 25°C and less than 35°C, the shallow seawater heat exchange mode is activated. At this time, the third submersible pump 502 and the second submersible pump 403 are turned off, and only the first submersible pump 305 is turned on. When the first submersible pump 305 pumps in the liquid medium, the liquid medium enters the liquid flow network 303. The liquid medium enters the corresponding cold plate through the cold plate inlet 301, and the corresponding energy storage battery module 101 performs non-contact heat exchange. It flows out through the cold plate outlet 302 and enters the liquid flow network 303, and then enters the first heat exchanger 306. In the first heat exchanger 306, seawater washes the fins of the first heat exchanger 306 to enhance seawater heat exchange. When the temperature of the energy storage battery module 101 is greater than 35°C and less than 45°C, the mid-level seawater heat exchange mode is activated. At this time, the third submersible pump 502 and the first submersible pump 305 are turned off, and only the second submersible pump 403 is turned on. The second submersible pump 403 pumps in the liquid medium, which enters the liquid flow network 303. The liquid medium enters the corresponding cold plate through the cold plate inlet 301, and the corresponding energy storage battery module 101 performs non-contact heat exchange. It flows out through the cold plate outlet 302 and enters the liquid flow network 303, and then enters the second heat exchanger 402. In the first heat exchanger 306, seawater washes the fins of the first heat exchanger 306 to enhance seawater heat exchange. When the temperature of the energy storage battery module 101 exceeds 45°C, the deep seawater heat exchange mode is activated. At this time, the first submersible pump 305 and the second submersible pump 403 are turned off, and only the third submersible pump 502 is turned on. The third submersible pump 502 pumps in the liquid medium, which is pumped into the liquid flow network 303. The liquid medium enters the corresponding cold plate through the cold plate inlet 301, and the corresponding energy storage battery module 101 performs non-contact heat exchange. It flows out through the cold plate outlet 302 and into the liquid flow network 303, and then into the third heat exchanger 503. In the first heat exchanger 306, seawater washes the fins of the first heat exchanger 306 to enhance seawater heat exchange.

[0056] In some embodiments of this application, after the first submersible pump 305, the second submersible pump 403 and the third submersible pump 502 pump in the liquid medium, the corresponding submersible pump can be shut down as needed.

[0057] In some embodiments of this application, the marine environmental energy storage platform includes a DC side and an AC side inverter. The DC-side battery discharge power of the energy storage battery module 101 is converted from DC to AC in the AC inverter compartment 106 to provide mechanical power for oil drilling on the marine platform 203 and to provide electricity for the accommodation of the personnel on the marine platform 203. During the operation of the energy storage battery module 101, heat is generated. The thermal management system and methods ensure that the battery operating temperature is within a reasonable range (20-25°C) and that the battery temperature is consistent (≤5°C).

[0058] In some embodiments of this application, when land-based vehicle power battery systems or electrochemical energy storage systems employ liquid flow thermal management, coolant (50% deionized water + 50% ethylene glycol) is often used as the medium. In the liquid flow thermal management of the energy storage system for the offshore platform 203, the liquid flow medium can be directly pumped into deep-sea water.

[0059] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A battery liquid flow thermal management system for a marine all-weather energy storage platform, characterized in that, include: Multiple energy storage prefabricated modules are placed on an offshore platform, and each energy storage prefabricated module contains multiple energy storage battery modules; The liquid flow cooling plate is used for heat exchange with the energy storage battery module. Each energy storage battery module has a corresponding liquid flow cooling plate installed below it. The inverter compartment is where DC-AC conversion is performed, converting the electrical energy output from the energy storage battery module into AC power for external supply. A heat exchanger, located in seawater, is used to exchange heat with seawater; Submersible pumps, which are located in seawater, are used to pump liquid media in heat exchangers; The battery fluid flow network loop circulates the fluid medium in a loop consisting of a fluid flow cooling plate, a heat exchanger, and a submersible pump.

2. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 1, characterized in that, The heat exchangers are configured in parallel, including a first heat exchanger, a second heat exchanger, and a third heat exchanger. Depending on the depth of the seawater where the heat exchangers are located, the depth of the seawater where the first heat exchanger is located < the depth of the seawater where the second heat exchanger is located < the depth of the seawater where the third heat exchanger is located. In summer, as the seawater depth increases, the seawater temperature gradually decreases, and the seawater temperature at the depth of the first heat exchanger > the seawater temperature at the depth of the second heat exchanger > the seawater temperature at the depth of the third heat exchanger. In winter, as the seawater depth increases, the seawater temperature is higher than the ambient air temperature.

3. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 2, characterized in that, The first heat exchanger, the second heat exchanger, and the third heat exchanger should each be connected in series with a first submersible pump, a second submersible pump, and a third submersible pump; the end of the third submersible pump away from the third heat exchanger is connected between the second heat exchanger and the second submersible pump, and the end of the third heat exchanger away from the third submersible pump is connected to the end of the second heat exchanger away from the second submersible pump; the end of the second submersible pump away from the second heat exchanger is connected to the pipeline between the first submersible pump and the first heat exchanger, and the end of the second heat exchanger away from the second submersible pump is connected to the end of the first heat exchanger away from the first submersible pump.

4. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 3, characterized in that, The first heat exchanger is located in seawater at a depth of 0-10 meters, the second heat exchanger is located in seawater at a depth of 10-30 meters, and the third heat exchanger is located in seawater at a depth greater than 30 meters. Under summer conditions, the seawater temperature at the first heat exchanger is in the range of 20-25℃, the seawater temperature at the second heat exchanger is in the range of 15-20℃, and the seawater temperature at the third heat exchanger is in the range of 10-15℃. Under winter conditions, the seawater temperature at the first heat exchanger is 10-15℃.

5. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 1, characterized in that, The submersible pump pumps the liquid medium into the liquid flow pipeline network, which enters the liquid flow cold plate through the cold plate inlet and performs non-contact heat exchange with the energy storage battery module. After heat exchange, the liquid medium carrying the battery heat flows out through the cold plate outlet and returns to the heat exchanger. In the heat exchanger, the liquid medium exchanges heat with the seawater outside the heat exchanger.

6. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 1, characterized in that, Multiple prefabricated energy storage compartments are spaced apart. The liquid flow cooling plate corresponding to the energy storage battery module in each prefabricated energy storage compartment is connected in parallel with the liquid flow cooling plate corresponding to the energy storage battery module in the adjacent prefabricated energy storage compartment. The liquid flow medium pumped from the submersible pump flows through the liquid flow pipeline network and is distributed into the multiple liquid flow cooling plates corresponding to the multiple energy storage battery modules in the multiple prefabricated energy storage compartments to exchange heat with the energy storage battery modules. After heat exchange, the liquid flow medium flows through the outlet of the cooling plate back to the battery liquid flow pipeline network loop to exchange heat with the multiple prefabricated energy storage compartments and ensure that the energy storage battery modules operate within a suitable temperature range.

7. The battery liquid flow thermal management system for a marine all-weather energy storage platform according to claim 1, characterized in that, An exhaust valve is installed at the end of the liquid flow pipeline, and it is angled upward so that the air carried in the liquid flow medium can be discharged through the exhaust valve at the end. The liquid flow medium is seawater, and seawater is used as the natural liquid flow medium. When the liquid flow medium is seawater, a permeable membrane is used to desalinate the seawater.

8. A battery liquid flow thermal management method for a marine all-weather energy storage platform, characterized in that, The battery liquid flow thermal management system for a marine all-weather energy storage platform as described in claim 3 includes: Under summer operating conditions, the following steps are included: The system determines whether the temperature of the energy storage battery module exceeds 45℃. If it does, a third heat exchanger is used to exchange heat with the surrounding seawater, i.e., deep seawater heat exchange mode. When the temperature of the energy storage battery module is between 35-45℃, a second heat exchanger is used to exchange heat with the seawater, i.e., mid-level seawater heat exchange mode. When the battery temperature is between 25-35℃, a first heat exchanger is used to exchange heat with the seawater, i.e., shallow seawater heat exchange mode. The three modes of deep seawater heat exchange, mid-level seawater heat exchange, and shallow seawater heat exchange can be used in combination and activated simultaneously for synergistic heat exchange. Under winter operating conditions, the following steps are included: First, the air temperature is determined. When the ambient temperature is <5℃, the shallow seawater heat exchange mode is activated; otherwise, the mode is stopped. When the shallow seawater heat exchange mode is activated, the temperature of the energy storage battery module is determined. When the battery temperature is <10℃, the flow rate of the liquid medium is increased until the energy storage battery module reaches the preset temperature, and then the shallow seawater heat exchange mode is stopped.

9. A battery liquid flow thermal management method for a marine all-weather energy storage platform according to claim 8, characterized in that, The thermal management method is specifically as follows: When the temperature of the energy storage battery module is greater than 25°C and less than 35°C, the shallow seawater heat exchange mode is activated. At this time, the third and second submersible pumps are turned off, and only the first submersible pump is turned on. When the first submersible pump pumps in the liquid medium, the liquid medium enters the liquid flow network. The liquid medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It flows out through the cold plate outlet and enters the liquid flow network, and then enters the first heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange. When the temperature of the energy storage battery module is greater than 35℃ but less than 45℃, the middle layer seawater heat exchange mode is activated. At this time, the third submersible pump and the first submersible pump are turned off, and only the second submersible pump is turned on. The second submersible pump pumps in the liquid flow medium, which is pumped into the liquid flow pipeline. The liquid flow medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It flows out through the cold plate outlet and enters the liquid flow pipeline, and then enters the second heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange. When the temperature of the energy storage battery module exceeds 45°C, the deep seawater heat exchange mode is activated. At this time, the first and second submersible pumps are turned off, and only the third submersible pump is activated. The third submersible pump pumps in the liquid flow medium, which enters the liquid flow pipeline network. The liquid flow medium enters the corresponding cold plate through the cold plate inlet, and the corresponding energy storage battery module performs non-contact heat exchange. It then flows out through the cold plate outlet and enters the liquid flow pipeline network, and then enters the third heat exchanger. In the first heat exchanger, seawater washes the fins of the first heat exchanger to enhance seawater heat exchange.

10. A battery liquid flow thermal management method for a marine all-weather energy storage platform according to claim 9, characterized in that, After the first, second, and third submersible pumps pump in the liquid medium, the corresponding submersible pumps are shut down.

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