Intelligent immersed energy storage system

Abstract

The invention relates to the field of energy storage batteries, in particular to an intelligent immersed energy storage system which comprises an energy storage device, a plurality of battery packs are arranged in the energy storage device, a plurality of battery cells are arranged in the battery packs, the battery packs adopt an immersion liquid dynamic semi-immersion mode, and an immersion liquid circulation subsystem is arranged on the lower portion of the energy storage device and used for controlling circulation of immersion liquid. When the battery pack is abnormal, the immersion liquid in other battery packs can be reversely and circularly injected into the abnormal battery pack; the energy storage device can adopt forms of an energy storage cabinet, an energy storage container and the like, the battery packs adopt an immersion liquid dynamic semi-immersion mode for heat dissipation, during normal operation, the immersion liquid circulation subsystem is used for controlling immersion liquid in the multiple battery packs to circularly flow in the forward direction, and when the battery packs are abnormal, the immersion liquid circulation subsystem is used for controlling the immersion liquid in the multiple battery packs to circularly flow in the forward direction. And the immersion liquid circulation subsystem is used for reversely and circularly injecting immersion liquid in other battery packs into the abnormal battery pack, so that the abnormal battery pack is changed from semi-immersion into full immersion, and the effects of cooling, extinguishing fire and the like are further realized.

Description

Technical Field

[0001] The present invention relates to the field of energy storage batteries, and in particular to an intelligent immersed energy storage system. Background Art

[0002] As a form of energy storage, electrochemical energy storage is widely used on the power generation side, the grid side and the user side. The battery pack is the basic component unit of electrochemical energy storage. Each battery pack contains multiple single cells, and some large energy storage systems will have multiple battery packs placed in parallel to increase the storage capacity. The battery pack will inevitably generate a lot of heat when charging and discharging. When the battery cell has thermal runaway, the violent reaction can easily cause a fire. Therefore, many energy storage systems are currently equipped with refrigeration units, fire protection systems and other facilities. However, this not only increases the cost, but also makes it difficult to restore the fire protection system after it is started, and may even directly damage the energy storage system and make it scrapped. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide an intelligent submerged energy storage system to solve the existing

[0004] To achieve the above-mentioned purpose, the present invention provides an intelligent immersion energy storage system, including an energy storage device, wherein a plurality of battery packs are arranged in the energy storage device, a plurality of battery cells are arranged in the battery pack, the battery pack adopts a dynamic semi-immersion mode of immersion liquid, and an immersion liquid circulation subsystem is arranged at the lower part of the energy storage device for controlling the circulation of the immersion liquid, and when the battery pack is abnormal, the immersion liquid in other battery packs can be reversely circulated and injected into the abnormal battery pack.

[0005] Principle of the technical solution: The energy storage device can be in the form of an energy storage cabinet, an energy storage container, etc., with multiple battery packs arranged inside. Multiple battery cells are arranged in the battery pack for charging, discharging and storing energy; the battery pack adopts a dynamic semi-immersion method of immersion liquid to dissipate heat. During normal operation, the immersion liquid circulation subsystem is used to control the forward circulation flow of the immersion liquid in the multiple battery packs. When the battery pack is abnormal, the immersion liquid circulation subsystem reversely circulates the immersion liquid in other battery packs and injects it into the abnormal battery pack, changing it from semi-immersion to full immersion, thereby achieving cooling, fire extinguishing and other effects.

[0006] Compared with the prior art, the beneficial effects of the present invention are: 1. The immersion liquid required for the entire energy storage system is greatly reduced. Compared with the existing full immersion method, the immersion liquid demand is reduced by half; compared with the ordinary semi-immersion method, the battery pack fire protection structure, cold plate circulation, and battery pack-level MSD and other parts are omitted; and compared with semi-immersion and an additional liquid storage tank to store excess immersion liquid, when the battery pack is abnormal, the immersion liquid in the liquid storage tank is injected into the abnormal battery pack: this method reserves immersion liquid for multiple battery packs to ensure that multiple battery packs can be filled, while this solution uses the immersion liquid in other normal battery packs to fill the abnormal battery pack, which can at least meet the filling of half of the battery packs, without reserving immersion liquid, and the immersion liquid demand is greatly reduced. Especially when used in energy storage containers, a large amount of immersion liquid needs to be reserved for cooling and fire extinguishing.

[0007] 2. The cost is greatly reduced. The immersion liquid must have cooling and temperature reduction effects, as well as fire extinguishing and non-conductive effects. The price is relatively high. Reducing the demand for immersion liquid can greatly reduce the cost. At the same time, compared with the full immersion method, the immersion liquid is reduced by half, and the liquid cooling unit used for full immersion has high power and high maintenance costs, and the box sealing, pressure resistance and expansion resistance performance requirements are high. The battery pack production cost is high, while the design requirements of this solution are low and the cost is controllable. Compared with ordinary semi-immersion, the cost of the fire protection structure is saved. Compared with semi-immersion and reserved immersion liquid cooling and fire extinguishing methods, reducing the immersion liquid can reduce costs, and there is no need for an additional storage tank for the reserved immersion liquid, the overall volume is smaller, and the space occupied is also reduced. Overall, the cost is greatly reduced compared with the existing technology.

[0008] 3. Compared with the full immersion method, the maintenance times of the immersion liquid are reduced, which facilitates on-site operation and maintenance.

[0009] 4. The design of dynamic semi-immersion combined with static full immersion can avoid the potential safety hazard to the battery circuit due to the increase of electrolyte conductivity after the battery leaks.

[0010] 5. Compared with ordinary semi-immersion, this solution can be recycled after handling the abnormality, avoiding false alarms that trigger the fire protection system and cause scrap losses.

[0011] 6. Compared with the existing liquid cooling plate immersion solution, this intelligent immersion solution can upgrade the control system according to the cloud-edge model, continuously improve the accuracy of the control logic and the accuracy of advance prediction, thereby continuously simplifying components during the upgrade process, achieving absolute zero thermal runaway, and optimal battery cell thermal management control range, thereby achieving maximum safety efficiency and maximum discharge capacity for long-term operation of the energy storage system.

[0012] As a preferred embodiment of the present invention, it also includes a main circuit water pump and a branch water pump. When the battery pack is charging and discharging and operating normally, the main circuit water pump operates to allow the immersion liquid to circulate forward into the battery pack, so that the battery cells are in a dynamic semi-immersion state; when the battery pack is abnormal, it is switched to the branch water pump, and the branch water pump is used to allow the immersion liquid to circulate reversely and be injected into the abnormal battery pack.

[0013] Beneficial effects: The main circuit water pump is used to circulate the immersion liquid forward, and with the cooperation of the liquid inlet valve and the liquid outlet valve, the battery cell is always in a semi-immersed state; when the battery pack is abnormal, the branch water pump is used to circulate the immersion liquid in reverse and inject it into the abnormal battery pack; the main circuit water pump and the branch water pump have opposite water flow pumping directions, and they are switched in the event of an abnormality, so that the immersion liquid is reversely pumped into the abnormal battery pack.

[0014] As a preferred embodiment of the present invention, the immersion liquid circulation subsystem includes a liquid cooling unit connected to the main circuit water pump and the branch water pump, and a liquid inlet pipeline and a liquid outlet pipeline connected to the main circuit water pump and the branch water pump, the liquid inlet pipeline is connected to the lower portion of the front face of the battery pack through a plurality of liquid inlet branches, the liquid outlet pipeline is connected to the upper portion of the front face of the battery pack through a plurality of liquid outlet branches, the liquid inlet branch is provided with a liquid inlet valve, and the liquid outlet branch is provided with a liquid outlet valve.

[0015] Beneficial effect: The liquid cooling unit is used to exchange heat for the immersion liquid, and forms an immersion liquid circulation through the liquid inlet pipeline, the liquid inlet branch pipe, the liquid outlet branch pipe, the liquid outlet pipeline and the plurality of battery packs. The liquid inlet valve and the liquid outlet valve can adopt solenoid valves, electric valves and other valves, which are used to open and close the liquid inlet branch pipe and the liquid outlet branch pipe to cooperate in handling abnormal situations.

[0016] As a preferred embodiment of the present invention, it also includes a battery management subsystem, which includes a detection module and an abnormality handling module. The detection module is used to detect whether the multiple battery packs are abnormal; when the battery pack is abnormal, the main circuit water pump, the branch water pump, the liquid inlet valve and the liquid outlet valve work together under the abnormality handling module to reversely circulate the immersion liquid in other battery packs and inject it into the abnormal battery pack.

[0017] Beneficial effect: 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 operating conditions; in the event of an abnormality, the signal is transmitted to the abnormality handling module, and by switching the main circuit water pump and the branch water pump, and controlling the liquid inlet valve and the liquid outlet valve switches, they work together to switch the immersion liquid flow direction and handle the abnormal battery pack.

[0018] As a preferred embodiment of the present invention, the abnormality handling module includes a high temperature warning mode: when it is detected that the battery cell temperature is too high, the battery pack serial number is uploaded, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack, and the immersion liquid of the battery pack is increased until the battery cell temperature in the battery pack returns to normal levels, and the temperature uniformity of the battery cells is accelerated.

[0019] Beneficial effect: When it is detected that the temperature of the battery cell is too high, the battery pack serial number is uploaded, an abnormality report is sent, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched. At this time, the normal battery pack discharges the immersion liquid through the liquid inlet valve, and 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 into the battery pack from the liquid outlet pipeline, and 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, thereby increasing the immersion degree and the heat dissipation capacity until the temperature of the battery cell in the battery pack returns to normal levels; after returning to normal, switching to the forward cycle can also allow the immersion liquid in the battery pack to be fully mixed, thereby improving the temperature uniformity.

[0020] As a preferred embodiment of the present invention, the abnormality handling module also includes a thermal runaway suppression mode: when thermal runaway of a battery cell is detected, the serial number of the battery pack is uploaded, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack until the battery pack is filled with the immersion liquid, thereby suppressing the thermal runaway of the battery cell.

[0021] Beneficial effect: When thermal runaway of a battery cell is detected, the battery pack serial number is uploaded, an abnormality report is sent, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched. At this time, the normal battery pack discharges the immersion liquid through the liquid inlet valve, and 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 into the battery pack from the liquid outlet pipeline, and 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, thereby suppressing the thermal runaway of the battery cell, waiting for further detection or switching to the forward cycle again after returning to normal.

[0022] As a preferred embodiment of the present invention, the abnormality handling module also includes a leakage protection mode: when a leakage of the battery cell electrolyte is detected, the battery pack serial number is uploaded, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack until the battery pack is filled with immersion liquid. Filling with immersion liquid can prevent the leaking battery cell from short circuiting and catching fire.

[0023] Beneficial effect: When a leakage of battery cell electrolyte is detected, the battery pack serial number is uploaded, an abnormality report is sent, and the outlet valves of other normal battery packs are immediately closed, the inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched. At this time, the normal battery pack discharges the immersion liquid through the inlet valve, and the immersion liquid in the abnormal battery pack cannot be discharged through the inlet valve. After the branch water pump is started, the immersion liquid is pumped into the battery pack from the outlet pipeline, and at this time the 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 prevent the leaking battery cell from short-circuiting and catching fire, and the inlet valve of the abnormal battery pack is in a closed state, which can prevent the immersion liquid containing electrolyte from being reversely injected into the normal battery pack.

[0024] As a preferred embodiment of the present invention, the abnormality handling module also includes a recovery mode: opening the liquid inlet valves and liquid outlet valves of all battery packs, and then switching to the main circuit water pump to restore the immersion liquid to a normal liquid level.

[0025] Beneficial effects: After dealing with various abnormal effects, when it is detected that the battery cell temperature has returned to normal, open the liquid inlet valve and liquid outlet valve of all battery packs, and then switch to the main circuit water pump, pump out the immersion liquid through the water pump, and restore the immersion liquid to the normal liquid level, thereby realizing recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0027] Figure 1 It is a structural schematic diagram of an embodiment of an intelligent submerged energy storage system of the present invention.

[0028] Figure 2 This is a schematic diagram of the operation of the main circuit water pump and the branch circuit water pump of an intelligent submerged energy storage system embodiment of the present invention.

[0029] Figure 3 A schematic diagram of a battery management subsystem of an embodiment of an intelligent submerged energy storage system of the present invention.

[0030] The figure marks in the drawings of the specification include: 1 energy storage device, 2 battery pack, 3 liquid cooling unit, 4 liquid inlet pipeline, 5 liquid inlet branch pipe, 6 liquid outlet pipeline, 7 liquid outlet branch pipe, 8 liquid inlet valve, 9 liquid outlet valve, 10 main circuit water pump, 11 branch water pump. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used 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", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

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

[0035] As attached Figure 1 As shown, the present invention provides an intelligent immersion energy storage system: comprising an energy storage device 1, the energy storage device 1 can be in the form of an energy storage cabinet, an energy storage container, etc., and the energy storage cabinet is adopted in the drawings of this embodiment; a plurality of battery packs 2 are arranged in the energy storage device 1, and a plurality of battery cells are arranged in the battery pack 2 for charging, discharging and storing energy; the battery pack 2 adopts a dynamic semi-immersion method of an immersion liquid, and a fluorinated liquid can be selected.

[0036] As attached Figure 1 and attached Figure 2As shown, in this embodiment, an immersion liquid circulation subsystem is provided at the lower part of the energy storage device 1, which is used to control the circulation of the immersion liquid, and when the battery pack 2 is abnormal, the immersion liquid in other battery packs 2 can be reversely circulated and injected into the abnormal battery pack 2; wherein the immersion liquid circulation subsystem includes a liquid cooling unit 3, and the liquid cooling unit 3 is connected with a liquid inlet pipeline 4 and a liquid outlet pipeline 6, the liquid inlet pipeline 4 is connected with the lower part of the front of the plurality of battery packs 2 through a plurality of liquid inlet branches 5, and the liquid outlet pipeline 6 is connected with the upper part of the front of the plurality of battery packs 2 through a plurality of liquid outlet branches 7, the liquid inlet branch 5 is provided with a liquid inlet valve 8, and the liquid outlet branch 7 is provided with a liquid outlet valve 9, the liquid inlet pipeline 4 and the liquid outlet pipeline 6 are connected with a main circuit water pump 10 and a branch water pump 11; the The main circuit water pump 10, the branch water pump 11, the liquid inlet pipeline 4 and the liquid outlet pipeline 6 are all connected; when the battery pack 2 is charging and discharging and operating normally, the liquid inlet valve 8 and the liquid outlet valve 9 are both opened, and the main circuit water pump 10 is running to allow the immersion liquid to circulate forward in the liquid inlet pipeline 4, multiple battery packs 2 and the liquid outlet pipeline 6, and the battery cells are always in a semi-immersed state; the branch water pump 11 is used to allow the immersion liquid to circulate reversely in the liquid inlet pipeline 4, multiple battery packs 2 and the liquid outlet pipeline 6; two opposite circulation loops are formed by the main circuit water pump 10 and the branch water pump 11, and by adjusting the liquid inlet valve 8 and the liquid outlet valve 9, the immersion liquid in other normal battery packs 2 is reversely circulated and injected into the abnormal battery pack 2.

[0037] As attached Figure 3 As shown, in this embodiment, a battery management subsystem is also included, and the battery management subsystem includes a detection module and an abnormality handling module. The detection module can use sensors such as temperature sensors, air pressure sensors, and conductive sensors to detect the battery pack and detect its operation status. The abnormality 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 conductive sensors to detect the battery pack 2 and detect its operation status; in the event of an abnormality, a signal is transmitted to the liquid cooling unit 3, the liquid inlet valve 8, and the liquid outlet valve 9, and the immersion liquid flow direction is switched by switching the main circuit water pump 10 and the branch water pump 11, and controlling the switches of the liquid inlet valve 8 and the liquid outlet valve 9 to handle the abnormal battery pack 2.

[0038] Among them, the high temperature warning mode: when it is detected that the battery cell temperature is too high, the serial number of the battery pack 2 is uploaded, and an abnormal report is sent. At the same time, the liquid outlet valve 9 of other normal battery packs 2 is immediately closed, and the liquid inlet valve 8 of the abnormal battery pack 2 is closed, and then the branch water pump 11 is switched. 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 into the battery pack from the liquid outlet pipeline 6, and 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, thereby increasing the immersion degree and the heat dissipation capacity until the temperature of the battery pack 2 returns to normal levels.

[0039] Among them, the thermal runaway suppression mode: when thermal runaway of the battery cell is detected (temperature>55 / 60℃ and temperature rise>1℃ / s), the serial number of the battery pack 2 is uploaded, an abnormality report is sent, and the liquid outlet valve 9 of other normal battery packs 2 is immediately closed, and the liquid inlet valve 8 of the abnormal battery pack 2 is closed, and then the branch water pump 11 is switched. 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 into the battery pack from the liquid outlet pipeline 6, and 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, thereby suppressing the thermal runaway of the battery cell and waiting for further detection.

[0040] Among them, the leakage protection mode: when a leakage of battery cell electrolyte is detected, the serial number of the battery pack 2 is uploaded, an abnormality report is sent, and the outlet valves 9 of other normal battery packs 2 are immediately closed, and the inlet valve 8 of the abnormal battery pack 2 is closed, and then the branch water pump 11 is switched. At this time, the normal battery pack 2 discharges the immersion liquid through the inlet valve 8, and the immersion liquid in the abnormal battery pack 2 cannot be discharged through the inlet valve 8. After the branch water pump 11 is started, the immersion liquid is pumped into the battery pack from the outlet pipeline 6, and at this time, the 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. After filling, the immersion liquid can prevent the leaking battery cell from short-circuiting and catching fire, and the inlet valve 8 of the abnormal battery pack 2 is in a closed state, which can prevent the immersion liquid containing electrolyte from being reversely injected into the normal battery pack 2.

[0041] Among them, the recovery mode: after dealing with 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, pump out the immersion liquid through the water pump, and restore the immersion liquid to the normal liquid level, thereby realizing recycling.

[0042] In addition, in the present embodiment, when a single battery pack 2 has a high temperature or thermal runaway, only the immersion liquid with the lowest temperature in the normal battery pack 2 can be extracted and reversely circulated and injected into the abnormal battery pack 2. The specific operation is: when a single battery pack 2 has a high temperature or thermal runaway, the liquid inlet valves 8 of all battery packs 2 and the liquid outlet valves 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 allows the low-temperature immersion liquid in the battery pack 2 to flow out through the liquid inlet valve 8, and then switches the liquid cooling unit 3 to the branch water pump 11 to pump the low-temperature immersion liquid into the abnormal battery pack 2; the immersion liquid with the lowest temperature and the immersion liquid with the highest temperature are mixed to improve the cooling efficiency in the abnormal battery pack 2; when multiple battery packs 2 have a high temperature or thermal runaway, the immersion liquid of a 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 also includes an analysis and warning module, which monitors the temperature and heating rate of each battery cell of the 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 reversely cycles the immersion liquid into the battery pack 2 in advance to achieve a pretreatment effect, reduce the risk of thermal runaway, and improve the safety of the battery pack 2.

[0044] The preferred implementation modes of the present application are described in detail above in conjunction with the accompanying drawings. Typical known structures and common knowledge technologies in the preferred implementation modes are not described in detail here. Ordinary technicians in the relevant field can improve and implement the technical solutions of the present invention based on their own abilities under the inspiration given by the present implementation modes. Some typical known structures, known methods or common knowledge technologies should not become obstacles for ordinary technicians in the relevant field to implement the present application.

[0045] The scope of protection required by this application shall be based on the contents of its claims, and the contents recorded in the invention content, specific implementation methods and drawings of the specification shall be used to interpret the claims.

[0046] Within the technical concept of the present application, several modifications may be made to the specific implementation methods of the present application, and these modified specific implementation methods should also be regarded as within the protection scope of the present application.

Claims

1. An intelligent immersion energy storage system, comprising an energy storage device, wherein the energy storage device is provided with a plurality of battery packs, wherein the battery packs are provided with a plurality of battery cells, characterized in that: The battery pack adopts a dynamic semi-immersion mode of immersion liquid. An immersion liquid circulation subsystem is arranged at the lower part of the energy storage device for controlling the circulation of the immersion liquid. When the battery pack is abnormal, the immersion liquid in other battery packs can be reversely circulated and injected into the abnormal battery pack.

2. The intelligent submerged energy storage system according to claim 1, characterized in that: It also includes a main circuit water pump and a branch circuit water pump. When the battery pack is charging and discharging and operating normally, the main circuit water pump operates to allow the immersion liquid to circulate forward into the battery pack, so that the battery cells are in a dynamic semi-immersion state. When the battery pack is abnormal, the branch circuit water pump is switched to allow the immersion liquid to circulate reversely and be injected into the abnormal battery pack.

3. The intelligent submerged energy storage system according to claim 2, characterized in that: The immersion liquid circulation subsystem includes a liquid cooling unit connected to the main circuit water pump and the branch water pump, and a liquid inlet pipeline and a liquid outlet pipeline connected to the main circuit water pump and the branch water pump. The liquid inlet pipeline is connected to the lower part of the front face of the battery pack through a plurality of liquid inlet branches, and the liquid outlet pipeline is connected to the upper part of the front face of the battery pack through a plurality of liquid outlet branches. The liquid inlet branch is provided with a liquid inlet valve, and the liquid outlet branch is provided with a liquid outlet valve.

4. The intelligent submerged energy storage system according to claim 3, characterized in that: It also includes a battery management subsystem, which includes a detection module and an abnormality handling module. The detection module is used to detect whether the multiple battery packs are abnormal. When the battery pack is abnormal, the main circuit water pump, the branch water pump, the liquid inlet valve and the liquid outlet valve work together under the abnormality handling module to reversely circulate the immersion liquid in other battery packs and inject it into the abnormal battery pack.

5. The intelligent submerged energy storage system according to claim 4, characterized in that: The abnormality handling module includes a high temperature warning mode: when it is detected that the battery cell temperature is too high, the battery pack serial number is uploaded, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack, and the immersion liquid of the battery pack is increased until the battery cell temperature in the battery pack returns to normal levels, and the battery cell temperature uniformity is accelerated.

6. The intelligent submerged energy storage system according to claim 4, characterized in that: The exception handling module also includes a thermal runaway suppression mode: when thermal runaway of a battery cell is detected, the battery pack serial number is uploaded, and the liquid outlet valves of other normal battery packs are immediately closed, the liquid inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack until the battery pack is filled with immersion liquid, thereby suppressing thermal runaway of the battery cell.

7. The intelligent submerged energy storage system according to claim 4, characterized in that: The abnormality handling module also includes a leakage protection mode: when a leakage of the battery cell electrolyte is detected, the battery pack serial number is uploaded, and the outlet valves of other normal battery packs are immediately closed, the inlet valve of the abnormal battery pack is closed, and then the branch water pump is switched to inject the immersion liquid of other battery packs into the abnormal battery pack until the battery pack is filled with immersion liquid. Filling with immersion liquid can prevent the leaking battery cell from short circuiting and catching fire.

8. The intelligent submerged energy storage system according to claim 4, characterized in that: The abnormality handling module also includes a recovery mode: when it is detected that the battery cell temperature has returned to normal, the liquid inlet valves and liquid outlet valves of all battery packs are opened, and then the main circuit water pump is switched to restore the immersion liquid to a normal liquid level.

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