Intelligent submerged energy storage system

Abstract

The present application relates to the field of energy storage battery, in particular to a kind of intelligent immersion energy storage system, including energy storage device, multiple battery packs are arranged in energy storage device, multiple battery packs are arranged in battery pack, battery pack uses immersion liquid dynamic semi-immersion mode, the lower portion of energy storage device is provided with immersion liquid circulation subsystem, for controlling immersion liquid circulation, and can when the battery pack is abnormal, other battery pack in immersion liquid is injected into the abnormal battery pack in reverse circulation;Energy storage device can adopt energy storage cabinet, energy storage container and the like, battery pack uses immersion liquid dynamic semi-immersion mode and carries out heat dissipation, when normal operation, immersion liquid circulation subsystem is used to control the forward circulation flow of immersion liquid in multiple battery packs, when the battery pack is abnormal, immersion liquid circulation subsystem injects other battery pack in immersion liquid into the abnormal battery pack in reverse circulation, changes from semi-immersion to full immersion, to realize cooling, fire extinguishing and the like effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage batteries, in particular to an intelligent immersed energy storage system. BACKGROUND

[0002] As a kind of energy storage, electrochemical energy storage has a wide range of applications in power generation side, power grid side and user side;Among them, the battery pack is the basic unit of electrochemical energy storage, each battery pack contains multiple single batteries, and some large energy storage systems will place multiple battery packs side by side to increase the energy storage capacity;When the battery pack charges and discharges, a large amount of heat will be generated inevitably, and when the battery pack overheats, the intense reaction will easily cause a fire, therefore, many energy storage systems are equipped with refrigeration units, fire extinguishing systems and other facilities, but this not only increases the cost, but also makes it difficult to recover after the fire extinguishing system is started, and even directly damages the energy storage system, making it scrap. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an intelligent immersed energy storage system to solve the problems of the prior art.

[0004] To achieve the above purpose, the present application provides an intelligent immersed energy storage system, comprising an energy storage device, the energy storage device is provided with a plurality of battery packs, the battery pack is provided with a plurality of battery cells, the battery pack adopts a dynamic semi-immersed way of immersion liquid, the lower part of the energy storage device is provided with an immersion liquid circulation subsystem for controlling the circulation of immersion liquid, and the immersion liquid in other battery packs can be injected into the abnormal battery pack in reverse direction when the battery pack is abnormal.

[0005] The principle of the technical scheme is that the energy storage device can adopt the form of energy storage cabinet, energy storage container, etc., and is provided with a plurality of battery packs inside, the battery pack is provided with a plurality of battery cells for charging and discharging and energy storage;The battery pack adopts a dynamic semi-immersed way of immersion liquid for heat dissipation, when operating normally, the immersion liquid circulation subsystem is used to control the forward circulation of immersion liquid in multiple battery packs, when the battery pack is abnormal, the immersion liquid in other battery packs is injected into the abnormal battery pack in reverse direction by the immersion liquid circulation subsystem, so that the battery pack changes from semi-immersed to fully immersed, and then achieves the effect of cooling, fire extinguishing, etc.

[0006] Compared with the prior art, the present application has the following advantages: 1. The amount of immersion liquid required by the entire energy storage system is greatly reduced. Compared with the existing full immersion method, the amount of immersion liquid required is reduced by half. Compared with the ordinary semi-immersion method, the battery pack fire-fighting structure, the cold plate circulation, and the battery pack level MSD parts are omitted. Compared with the semi-immersion method and the additional storage tank for storing excess immersion liquid, in the case of abnormal battery pack, the immersion liquid in the storage tank is injected into the abnormal battery pack. In order to ensure that the multiple battery packs are filled, the amount of immersion liquid for multiple battery packs is reserved. However, in this scheme, the immersion liquid in the other normal battery packs is used to fill the abnormal battery pack, which can at least meet the filling of half of the battery packs without reserving immersion liquid, thereby greatly reducing the demand for immersion liquid, especially when used in energy storage containers. A large amount of immersion liquid is required for the pre-reserved immersion liquid cooling and fire extinguishing method.

[0007] 2. The cost is greatly reduced. The immersion liquid not only has cooling and temperature reduction effect, but also has fire extinguishing, non-conducting and other effects, and the price is relatively high. After reducing the demand for immersion liquid, the cost can be greatly reduced. Compared with the full immersion method, the amount of immersion liquid is reduced by half, and the power of the liquid cooling unit used in the full immersion method is large, the maintenance cost is high, the sealing performance, pressure resistance and expansion resistance of the box body are high, and the manufacturing cost of the battery pack is high. However, the design requirements of this scheme are lower and the cost is controllable. Compared with the ordinary semi-immersion method, the cost of the fire-fighting structure is saved. Compared with the semi-immersion method and the pre-reserved immersion liquid cooling and fire extinguishing method, reducing the immersion liquid can reduce the cost, and there is no need for an additional storage tank for pre-reserved immersion liquid, so the overall volume is smaller and the occupied space is also reduced. Overall, the cost is greatly reduced compared with the prior art.

[0008] 3. Compared with the full immersion method, the maintenance frequency of the immersion liquid is reduced, and the on-site operation and maintenance are facilitated.

[0009] 4. The dynamic semi-immersion method combines the design of static full immersion to avoid the safety hazard of the electrolyte conductivity rising after the battery cell leaks.

[0010] 5. Compared with the ordinary semi-immersion method, the present application can be recycled after handling the abnormality, thereby avoiding the loss caused by false triggering of the fire-fighting system.

[0011] 6. Compared with the existing liquid cooling plate immersion scheme, the intelligent immersion scheme can upgrade the control system according to the cloud edge model, continuously improve the accuracy of the control logic and the prediction accuracy, and continuously simplify the parts during the upgrading process, achieve absolute zero thermal runaway, and realize the maximum safety efficiency and maximum discharge capacity of the energy storage system during long-term operation.

[0012] As a preferred embodiment of the present application, the main loop water pump and the branch water pump are further included, when the battery pack is charging and discharging normally, the main loop water pump is operated to make the immersion liquid circulate into the battery pack in a forward direction, so that the battery cell is in a dynamic semi-immersed state; when the battery pack is abnormal, the branch water pump is switched on, which is used to make the immersion liquid circulate into the abnormal battery pack in a reverse direction.

[0013] Beneficial effects: the main loop water pump is used to make the immersion liquid circulate in a forward direction, and the battery cell is always in a semi-immersed state under the cooperation of the liquid inlet valve and the liquid outlet valve; when the battery pack is abnormal, the branch water pump is used to make the immersion liquid circulate into the abnormal battery pack in a reverse direction; the water flow pump-out directions of the main loop water pump and the branch water pump are opposite, and the immersion liquid is pumped into the abnormal battery pack in a reverse direction when switched.

[0014] As a preferred embodiment of the present application, the immersion liquid circulation subsystem includes a liquid cooling unit connected with the main loop water pump and the branch water pump, and an inlet pipe and an outlet pipe connected with the main loop water pump and the branch water pump, the inlet pipe is connected with the lower part of the front of the battery pack through a plurality of inlet branch pipes, the outlet pipe is connected with the upper part of the front of the battery pack through a plurality of outlet branch pipes, the inlet branch pipes are provided with inlet valves, and the outlet branch pipes are provided with outlet valves.

[0015] Beneficial effects: the liquid cooling unit is used to exchange heat with the immersion liquid, and the immersion liquid circulation is formed among the inlet pipe, the inlet branch pipes, the outlet branch pipes, the outlet pipe and the battery pack, the inlet valves and the outlet valves can be electromagnetic valves, electric valves and other valves, which are used to switch the inlet branch pipes and the outlet branch pipes to cooperate with the abnormal situation.

[0016] As a preferred embodiment of the present application, the battery management subsystem is further included, the battery management subsystem includes a detection module and an abnormality processing module, the detection module is used to detect whether the battery pack is abnormal; when the battery pack is abnormal, the main loop water pump, the branch water pump, the inlet valve and the outlet valve work cooperatively under the abnormality processing module to make the immersion liquid in other battery packs circulate into the abnormal battery pack in a reverse direction.

[0017] Beneficial effects: the detection module of the battery management subsystem can use temperature sensors, air pressure sensors, conductive sensors and other sensors to detect the battery pack and detect its operation; when abnormal, the signal is transmitted to the abnormality processing module, the main loop water pump and the branch water pump are switched, and the inlet valve and the outlet valve are controlled to switch, so as to realize the switching of the immersion liquid flow and process the abnormal battery pack.

[0018] As a preferred embodiment of the present application, the abnormality processing module comprises a high-temperature early warning mode: when detecting that the temperature of the battery cell is too high, the serial number of the battery pack is uploaded, and at the same time, the liquid outlet valve of other normal battery packs is immediately closed, the liquid inlet valve of the abnormal battery pack is closed, then the branch water pump is switched, the immersion liquid of other battery packs is injected into the abnormal battery pack, the immersion of the battery pack is increased, and the temperature of the battery cell in the battery pack is restored to a normal level, and the temperature uniformity of the battery cell is accelerated.

[0019] Beneficial effects: when detecting that the temperature of the battery cell is too high, the serial number of the battery pack is uploaded, an abnormality report is sent, at the same time, the liquid outlet valve of other normal battery packs is immediately closed, the liquid inlet valve of the abnormal battery pack is closed, then the branch water pump is switched, at this time, the immersion liquid of the normal battery pack is discharged through the liquid inlet valve, the immersion liquid in the abnormal battery pack cannot be discharged through the liquid inlet valve, after the branch water pump is started, the immersion liquid is pumped from the liquid outlet pipeline into the battery pack, at this time, the liquid outlet valve of the normal battery pack is closed, and the pumped immersion liquid only enters the abnormal battery pack, the immersion degree is improved, the heat dissipation capacity is improved, and the temperature of the battery cell in the battery pack is restored to a normal level; after recovery, the forward circulation is switched, and the immersion liquid in the battery pack can be fully mixed, and the temperature uniformity is improved.

[0020] As a preferred embodiment of the present application, the abnormality processing module further comprises a thermal runaway suppression mode: when detecting that the battery cell has thermal runaway, the serial number of the battery pack is uploaded, at the same time, the liquid outlet valve of other normal battery packs is immediately closed, the liquid inlet valve of the abnormal battery pack is closed, then the branch water pump is switched, the immersion liquid of other battery packs is injected into the abnormal battery pack, and the battery pack is filled with the immersion liquid, so that the thermal runaway of the battery cell is suppressed.

[0021] Beneficial effects: when detecting that the battery cell has thermal runaway, the serial number of the battery pack is uploaded, an abnormality report is sent, at the same time, the liquid outlet valve of other normal battery packs is immediately closed, the liquid inlet valve of the abnormal battery pack is closed, then the branch water pump is switched, at this time, the immersion liquid of the normal battery pack is discharged through the liquid inlet valve, the immersion liquid in the abnormal battery pack cannot be discharged through the liquid inlet valve, after the branch water pump is started, the immersion liquid is pumped from the liquid outlet pipeline into the battery pack, at this time, the liquid outlet valve of the normal battery pack is closed, and the pumped immersion liquid only enters the abnormal battery pack, until the abnormal battery pack is completely filled, so that the thermal runaway of the battery cell is suppressed, and further detection is waited or the forward circulation is switched after recovery.

[0022] As a preferred embodiment of the present application, the abnormality processing module further comprises a liquid leakage protection mode: when detecting that the electrolyte of the battery cell leaks, uploading the battery pack serial number, immediately closing the liquid outlet valve of the other normal battery pack, closing the liquid inlet valve of the abnormal battery pack, and then switching to the branch water pump to inject the immersion liquid of the other battery pack into the abnormal battery pack until the battery pack is filled with the immersion liquid, which can avoid the short circuit and fire of the leaked battery cell.

[0023] Beneficial effects: when detecting that the electrolyte of the battery cell leaks, uploading the battery pack serial number, sending an abnormality report, immediately closing the liquid outlet valve of the other normal battery pack, closing the liquid inlet valve of the abnormal battery pack, and then switching to the branch water pump, at this time the immersion liquid of the normal battery pack is discharged through the liquid inlet valve, the immersion liquid in the abnormal battery pack cannot be discharged through the liquid inlet valve, after the branch water pump is started, the immersion liquid is pumped from the liquid outlet pipeline into the battery pack, at this time the liquid outlet valve of the normal battery pack is closed, and the pumped immersion liquid only enters the abnormal battery pack, until the abnormal battery pack is completely filled, after filling, the immersion liquid can avoid the short circuit and fire of the leaked battery cell, and the liquid inlet valve of the abnormal battery pack is closed, which can avoid the reverse injection of the immersion liquid containing the electrolyte into the normal battery pack.

[0024] As a preferred embodiment of the present application, the abnormality processing module further comprises a recovery mode: opening the liquid inlet valve and the liquid outlet valve of all battery packs, and then switching to the main loop water pump to restore the immersion liquid to the normal liquid level.

[0025] Beneficial effects: after processing various abnormal effects, when detecting that the temperature of the battery cell returns to normal, opening the liquid inlet valve and the liquid outlet valve of all battery packs, and then switching to the main loop water pump to pump out the immersion liquid and restore the immersion liquid to the normal liquid level, thereby realizing recycling. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows.

[0027] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of an intelligent immersion type energy storage system of the present application.

[0028] Figure 2 FIG. 2 is a running schematic diagram of a main loop water pump and a branch water pump of an embodiment of the intelligent immersion type energy storage system of the present application.

[0029] Figure 3 FIG. 3 is a schematic diagram of a battery management subsystem of an embodiment of the intelligent immersion type energy storage system of the present application.

[0030] The reference numerals in the accompanying drawings include: 1 energy storage device, 2 battery pack, 3 liquid cooling unit, 4 liquid inlet pipe, 5 liquid inlet branch pipe, 6 liquid outlet pipe, 7 liquid outlet branch pipe, 8 liquid inlet valve, 9 liquid outlet valve, 10 main circuit water pump, and 11 branch water pump. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] As attached Figure 1 As shown, the present invention provides an intelligent immersion energy storage system: including an energy storage device 1, which can be in the form of an energy storage cabinet, an energy storage container, etc. In this embodiment, the attached drawings show an energy storage cabinet; the energy storage device 1 is provided with multiple battery packs 2, and the battery packs 2 are provided with multiple battery cells for charging, discharging and storing energy; the battery packs 2 adopt a dynamic semi-immersion method with immersion liquid, which can be a fluorinated liquid.

[0036] As attached Figure 1 and attached Figure 2As shown, in this embodiment, the lower part of the energy storage device 1 is provided with a submerged liquid circulation subsystem for controlling the circulation of the submerged liquid and, when the battery pack 2 malfunctions, injecting the submerged liquid from other battery packs 2 into the malfunctioning battery pack 2 in reverse circulation; wherein the submerged liquid circulation subsystem includes a liquid cooling unit 3, the liquid cooling unit 3 is connected to an inlet pipe 4 and an outlet pipe 6, the inlet pipe 4 is connected to the lower part of the front of multiple battery packs 2 through multiple inlet branch pipes 5, the outlet pipe 6 is connected to the upper part of the front of multiple battery packs 2 through multiple outlet branch pipes 7, the inlet branch pipes 5 are provided with inlet valves 8, the outlet branch pipes 7 are provided with outlet valves 9, and the inlet pipes 4 and the outlet pipes 6 are connected to a main circuit water pump 10 and a branch water pump 11; The main circuit water pump 10, the branch water pump 11, the inlet pipe 4, and the outlet pipe 6 are all connected. When the battery pack 2 is charging, discharging, and operating normally, the inlet valve 8 and the outlet valve 9 are both open, and the main circuit water pump 10 operates, allowing the immersion liquid to circulate forward in the inlet pipe 4, the multiple battery packs 2, and the outlet pipe 6, keeping the battery cells in a semi-immersed state. The branch water pump 11 is used to allow the immersion liquid to circulate reverse in the inlet pipe 4, the multiple battery packs 2, and the outlet pipe 6. The main circuit water pump 10 and the branch water pump 11 form two opposite circulation loops, and by adjusting the inlet valve 8 and the outlet valve 9, the immersion liquid in other normal battery packs 2 can be reverse-circulated and injected into the abnormal battery packs 2.

[0037] As attached Figure 3 As shown, this embodiment also includes a battery management subsystem, which includes a detection module and an anomaly handling module. The detection module can use sensors such as temperature sensors, air pressure sensors, and conductivity sensors to detect the battery pack and monitor its operation. The anomaly handling module includes a high-temperature warning mode, a thermal runaway suppression mode, a leakage protection mode, and a recovery mode. The detection module can use sensors such as temperature sensors, air pressure sensors, and conductivity sensors to detect the battery pack 2 and monitor its operation. In case of an anomaly, the signal is transmitted to the liquid cooling unit 3, the inlet valve 8, and the outlet valve 9. By switching the main circuit water pump 10 and the branch water pump 11, and controlling the opening and closing of the inlet valve 8 and the outlet valve 9, the flow direction of the immersion liquid is switched to handle the abnormal battery pack 2.

[0038] Wherein, the high temperature early warning mode: when detecting that the battery cell temperature is too high, upload the battery pack 2 serial number, send an abnormal report, and immediately close the liquid outlet valve 9 of other normal battery packs 2, close the liquid inlet valve 8 of the abnormal battery pack 2, and then switch to the branch water pump 11. At this time, the normal battery pack 2 discharges the immersion liquid through the liquid inlet valve 8, and the immersion liquid in the abnormal battery pack 2 cannot be discharged through the liquid inlet valve 8. After the branch water pump 11 is started, the immersion liquid is pumped from the liquid outlet pipeline 6 into the battery pack. At this time, the liquid outlet valve 9 of the normal battery pack 2 is closed, and the pumped immersion liquid only enters the abnormal battery pack 2, so as to improve the immersion level and improve the heat dissipation capacity, until the temperature of the battery pack 2 returns to the normal level.

[0039] Wherein, the thermal runaway suppression mode: when detecting that the battery cell has thermal runaway (temperature > 55 / 60℃ and temperature rise > 1℃ / s), upload the battery pack 2 serial number, send an abnormal report, and immediately close the liquid outlet valve 9 of other normal battery packs 2, close the liquid inlet valve 8 of the abnormal battery pack 2, and then switch to the branch water pump 11. At this time, the normal battery pack 2 discharges the immersion liquid through the liquid inlet valve 8, and the immersion liquid in the abnormal battery pack 2 cannot be discharged through the liquid inlet valve 8. After the branch water pump 11 is started, the immersion liquid is pumped from the liquid outlet pipeline 6 into the battery pack. At this time, the liquid outlet valve 9 of the normal battery pack 2 is closed, and the pumped immersion liquid only enters the abnormal battery pack 2, until the abnormal battery pack 2 is completely filled, so as to suppress the thermal runaway of the battery cell, and wait for further detection.

[0040] Wherein, the liquid leakage protection mode: when detecting that the battery cell electrolyte leaks, upload the battery pack 2 serial number, send an abnormal report, and immediately close the liquid outlet valve 9 of other normal battery packs 2, close the liquid inlet valve 8 of the abnormal battery pack 2, and then switch to the branch water pump 11. At this time, the normal battery pack 2 discharges the immersion liquid through the liquid inlet valve 8, and the immersion liquid in the abnormal battery pack 2 cannot be discharged through the liquid inlet valve 8. After the branch water pump 11 is started, the immersion liquid is pumped from the liquid outlet pipeline 6 into the battery pack. At this time, the liquid outlet valve 9 of the normal battery pack 2 is closed, and the pumped immersion liquid only enters the abnormal battery pack 2, until the abnormal battery pack 2 is completely filled, so as to avoid the immersion liquid containing the electrolyte from being reversely injected into the normal battery pack 2.

[0041] Wherein, the recovery mode: after processing various abnormal effects, open the liquid inlet valve 8 and the liquid outlet valve 9 of all battery packs 2, and then switch the liquid cooling unit 3 to the main circuit water pump 10. The immersion liquid is pumped out by the water pump, and the immersion liquid is restored to the normal liquid level, so as to realize recycling.

[0042] In addition, in the embodiment, when a single battery pack 2 has high temperature or thermal runaway, the immersion liquid with the lowest temperature in the normal battery pack 2 can be extracted and injected into the abnormal battery pack 2 in reverse circulation. Specifically, when a single battery pack 2 has high temperature or thermal runaway, the liquid inlet valve 8 of all battery packs 2 and the liquid outlet valve 9 of the normal battery pack 2 are closed, and then the temperature of each battery pack 2 is detected by the temperature sensor. The battery management subsystem determines the serial number of the battery pack 2 with the lowest immersion liquid temperature, opens the liquid inlet valve 8 corresponding to the battery pack 2, and makes the low-temperature immersion liquid in the battery pack 2 flow out through the liquid inlet valve 8. Then, the liquid cooling unit 3 is switched to the branch water pump 11, and the low-temperature immersion liquid is pumped into the abnormal battery pack 2. The immersion liquid with the lowest temperature is mixed with the immersion liquid with the highest temperature to improve the cooling efficiency of the abnormal battery pack 2. When multiple battery packs 2 have high temperature or thermal runaway, the corresponding number of normal battery packs 2 can be extracted, and the normal battery packs 2 with lower immersion liquid temperature are preferentially extracted.

[0043] In addition, the battery management subsystem further comprises an analysis and early warning module. The analysis and early warning module monitors the temperature and temperature rising rate of each battery pack 2 in real time, determines whether there is a risk of thermal runaway in the future, calculates the time required for the current temperature to rise to the thermal runaway temperature, and injects the immersion liquid into the battery pack 2 in reverse circulation in advance to achieve the effect of pretreatment, reduce the risk of thermal runaway, and improve the safety of the battery pack 2.

[0044] The preferred embodiments of the present application are described in detail in combination with the drawings. The typical known structures and known common knowledge technologies are not described in detail here. The ordinary skilled in the art can improve and implement the technical solutions of the present application based on their own abilities and the inspiration given by the embodiments. Some typical known structures, known methods or known common knowledge technologies should not be an obstacle for the ordinary skilled in the art to implement the present application.

[0045] The scope of protection of the present application should be subject to the content of its claims. The content of the summary, detailed description and drawings of the specification is used to explain the claims.

[0046] Within the scope of the technical concept of the present application, several modifications can be made to the specific embodiments of the present application. The specific embodiments after the modifications should also be considered within the scope of protection of the present application.

Claims

1. An intelligent submerged energy storage system, comprising an energy storage device, a plurality of battery packs are arranged in the energy storage device, and a plurality of battery cells are arranged in the battery packs, characterized in that: The battery pack adopts a dynamic semi-submersion mode of immersion liquid, and a lower part of the energy storage device is provided with an immersion liquid circulation subsystem for controlling immersion liquid circulation and enabling reverse circulation of immersion liquid in other battery packs into an abnormal battery pack when the battery pack is abnormal; The battery pack further comprises a main loop water pump and a branch water pump, the main loop water pump is operated to enable forward circulation of immersion liquid into the battery pack and enable a dynamic semi-submersion state of the battery cell when the battery pack is charging, discharging and normally operating, and the branch water pump is switched to when the battery pack is abnormal, and the branch water pump is used to enable reverse circulation of immersion liquid into the abnormal battery pack; The immersion liquid circulation subsystem comprises a liquid cooling unit in communication with the main loop water pump and the branch water pump, and an inlet liquid pipeline and an outlet liquid pipeline in communication with the main loop water pump and the branch water pump, the inlet liquid pipeline is in communication with the lower part of the front of the battery pack through a plurality of inlet liquid branch pipes, and the outlet liquid pipeline is in communication with the upper part of the front of the battery pack through a plurality of outlet liquid branch pipes, the inlet liquid branch pipes are provided with inlet liquid valves, and the outlet liquid branch pipes are provided with outlet liquid valves; The battery pack further comprises a battery management subsystem, the battery management subsystem comprises a detection module and an abnormality processing module, the detection module is used to detect whether the battery pack is abnormal, and the main loop water pump, the branch water pump, the inlet liquid valve and the outlet liquid valve are cooperatively operated under the abnormality processing module to enable reverse circulation of immersion liquid in other battery packs into the abnormal battery pack when the battery pack is abnormal; The detection module can detect the battery pack by using a temperature sensor, a gas pressure sensor and a conductive sensor to detect the operation of the battery pack, and the abnormality processing module comprises a high temperature early warning mode, a thermal runaway suppression mode, a liquid leakage protection mode and a recovery mode.

2. The intelligent submerged energy storage system of claim 1, wherein: The high temperature early warning mode is that when the temperature of the battery cell is detected to be too high, the serial number of the battery pack is uploaded, the outlet liquid valves of other normal battery packs are immediately closed, the inlet liquid valve of the abnormal battery pack is closed, the branch water pump is switched to, the immersion liquid of other battery packs is injected into the abnormal battery pack, the immersion liquid of the battery pack is increased, and the temperature of the battery cell in the battery pack is restored to a normal level, and the uniformity of the battery cell is accelerated.

3. The intelligent submerged energy storage system of claim 1, wherein: The thermal runaway suppression mode is that when the thermal runaway of the battery cell is detected, the serial number of the battery pack is uploaded, the outlet liquid valves of other normal battery packs are immediately closed, the inlet liquid valve of the abnormal battery pack is closed, the branch water pump is switched to, the immersion liquid of other battery packs is injected into the abnormal battery pack, and the battery pack is filled with immersion liquid, so as to suppress the thermal runaway of the battery cell.

4. The intelligent submerged energy storage system of claim 1, wherein: The liquid leakage protection mode is that when the leakage of the electrolyte of the battery cell is detected, the serial number of the battery pack is uploaded, the outlet liquid valves of other normal battery packs are immediately closed, the inlet liquid valve of the abnormal battery pack is closed, the branch water pump is switched to, the immersion liquid of other battery packs is injected into the abnormal battery pack, and the battery pack is filled with immersion liquid, so as to avoid short circuit and fire of the leaking battery cell.

5. The intelligent submerged energy storage system of claim 1, wherein: The recovery mode is: when detecting that the battery cell temperature returns to normal, opening the liquid inlet valve and the liquid outlet valve of all battery packs, and then switching to the main loop water pump to restore the immersion liquid to the normal liquid level.

Images