Energy storage system based on package-level immersed fire-fighting management

Abstract

The utility model discloses an energy storage system based on pack-level immersed fire-fighting management, which comprises an energy storage box body, a fire-fighting system arranged in the energy storage box body and a plurality of battery clusters arranged at intervals, and each battery cluster comprises a plurality of battery packs, a first-level BMS unit, a second-level BMS unit and a high-voltage box arranged below the battery packs, the battery pack comprises a first-stage BMS unit and a battery module, the first-stage BMS unit is in communication connection with the battery module and a second-stage BMS unit, and a control module in communication connection with the second-stage BMS unit is arranged in the high-voltage box; the fire fighting system comprises a liquid cooling unit, a liquid cooling pipeline and immersion fire fighting pipelines, the liquid cooling unit is communicated with the battery packs through the liquid cooling pipeline, the immersion fire fighting pipelines are in one-to-one correspondence with the battery clusters and are communicated with the liquid cooling pipeline through cluster-level electromagnetic valves, and each battery pack is communicated with the corresponding immersion fire fighting pipeline through a pack-level electromagnetic valve; and the package-level electromagnetic valves and the cluster-level electromagnetic valves are in communication connection with the corresponding control modules.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to an energy storage system based on package-level immersion fire management. Background Art

[0002] In lithium-ion energy storage systems, due to the characteristics of lithium-ion batteries, there is a risk of fire in the energy storage system due to thermal runaway of the batteries. Therefore, a fire protection system is configured in the energy storage system.

[0003] In existing energy storage systems, the commonly used fire fighting scheme is the gas fire fighting system, and the fire extinguishing media include perfluorohexanone, heptafluoropropane or aerosols. There are two conventional fire fighting schemes: one is to use cabin-level gas immersion fire fighting, arrange detectors and nozzles in the battery compartment, and when the battery has thermal runaway, spray the entire battery compartment with medicine to achieve cabin-level fire fighting; the other is to set fire fighting nozzles on the battery pack, and when the battery has thermal runaway, spray the entire cluster of battery packs where the thermal runaway battery pack is located with medicine or add a control valve to spray the thermal runaway battery pack separately to achieve the purpose of fire fighting. However, the cabin-level gas fire fighting has a late fire fighting time and poor fire fighting effect, and there is a risk of causing damage to the battery pack of the entire cabin. At the same time, when using gas fire fighting, there is a risk of battery re-ignition after the gas reaction volatilizes; and the cluster-level spraying scheme, the battery pack that has not experienced thermal runaway will also be sprayed with medicine, which will affect the battery and has a high cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an energy storage system based on pack-level immersion fire management, so as to accurately carry out individual fire protection treatment on thermal runaway battery packs in the energy storage system, thereby improving the fire extinguishing efficiency and effect.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions: to provide an energy storage system based on pack-level immersion fire management, including an energy storage box, a plurality of battery clusters and a fire protection system, wherein the battery clusters are arranged in intervals in the energy storage box, each of the battery clusters includes a plurality of battery packs stacked in sequence from top to bottom, a first-level BMS unit and a high-voltage box, the high-voltage box is arranged below the battery pack at the end, the battery pack includes a first-level BMS unit and a battery module, the first-level BMS unit is connected to the battery module and the second-level BMS unit in communication, the high-voltage box is arranged below the battery pack at the end, the battery pack includes a first-level BMS unit and a battery module, the first-level BMS unit is connected to the battery module and the second-level BMS unit in communication, and the high-voltage box is arranged below the battery pack at the end ... and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery pack at the end, and the high-voltage box is arranged below the battery A control module is provided in the box, and the control module is communicatively connected with the secondary BMS unit; the fire protection system is provided in the energy storage box, and includes a liquid cooling unit, a liquid cooling pipeline and an immersion fire protection pipeline. The liquid cooling unit is connected with the battery pack through the liquid cooling pipeline, and the immersion fire protection pipeline corresponds to the battery cluster one by one, and the liquid cooling pipeline is connected with the immersion fire protection pipeline through a cluster-level solenoid valve. Each battery pack of the battery cluster is connected with the corresponding immersion fire protection pipeline through a pack-level solenoid valve, and the pack-level solenoid valve and the cluster-level solenoid valve are communicatively connected with the control module of the corresponding battery cluster.

[0006] The beneficial technical effect of the utility model is that the energy storage system based on pack-level immersion fire management of the utility model is provided with a fire protection system and a plurality of battery clusters arranged at intervals in the energy storage box body, and each battery cluster includes a plurality of battery packs stacked up and down in sequence, a first-level BMS unit and a high-voltage box arranged below the battery pack, and the battery pack includes a first-level BMS unit and a battery module, and the first-level BMS unit is communicatively connected with the battery module and the second-level BMS unit, so that the first-level BMS unit of each battery pack of the same battery cluster can separately collect and obtain the battery data of the battery module of the battery pack, so that the first-level BMS unit can timely and quickly obtain the battery data and transmit it to the second-level BMS unit of the battery cluster, so as to timely perform abnormal detection, timely firefighting, and improve the firefighting effect, and the use of BMS for detection can relatively reduce the number of detectors installed outside the battery pack, and the detection effect is more accurate and reliable, the first-level BMS unit corresponds to the battery pack one by one, and the second-level BMS unit The cells correspond one-to-one to the battery clusters, so that the corresponding battery clusters and battery packs can be located more accurately and fires can be extinguished accurately; moreover, the immersion fire-fighting pipelines of the fire-fighting system correspond one-to-one to the battery clusters, and are connected to the liquid cooling pipelines through cluster-level solenoid valves, so that the immersion fire-fighting pipelines and cooling pipelines are shared, saving space and cost, and the liquid for immersion fire-fighting is liquid cooled by a liquid cooling unit, and the cooling effect is better, so as to improve the fire-fighting effect; moreover, the use of liquid immersion fire-fighting can avoid the risk of battery re-ignition after gas reaction and volatilization in gas fire-fighting, and each battery pack is connected to the corresponding immersion fire-fighting pipeline through a pack-level solenoid valve, and the pack-level solenoid valve and the cluster-level solenoid valve are communicated with the control module arranged in the high-voltage box of the corresponding battery cluster and communicated with the secondary BMS unit, so as to accurately locate the fire-fighting, avoid the risk of damage to the battery pack of the entire cabin caused by cabin-level fire-fighting, and also prevent the impact caused by spraying agents on battery packs that have not experienced thermal runaway during cluster-level spraying fire-fighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 It is a schematic diagram of the energy storage system based on package-level immersion fire management of the utility model;

[0009] Figure 2 It is a schematic diagram of the connection between the liquid cooling unit and the liquid tank of the energy storage system based on the package-level immersion fire management of the utility model;

[0010] Figure 3A schematic flow chart of a fire management method for an energy storage system based on package-level immersion fire management of the utility model;

[0011] Figure 4 It is a specific flow chart of the fire management method of the energy storage system based on package-level immersion fire management of the utility model. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] See also Figures 1 to 4 , Figure 1 The schematic diagram of the energy storage system based on pack-level immersion fire management of the utility model, the energy storage system based on pack-level immersion fire management comprises an energy storage box 11, a plurality of battery clusters 12 and a fire protection system, the battery clusters 12 are arranged in the energy storage box 11 at intervals, each of the battery clusters 12 comprises a plurality of battery packs 13 stacked in sequence from top to bottom, a first and second BMS unit and a high-voltage box 14, the high-voltage box 14 is arranged below the battery pack 13 located at the end, the battery pack 13 comprises a first-level BMS unit and a battery module, the first-level BMS unit is communicatively connected with the battery module and the second-level BMS unit, the high-voltage box 14 is provided with a control module, the The control module is communicatively connected to the secondary BMS unit; the fire protection system is arranged in the energy storage box 11, including a liquid cooling unit 15, a liquid cooling pipeline 17 and an immersion fire protection pipeline 16, the liquid cooling unit 15 is communicated with the battery pack 13 through the liquid cooling pipeline 17, the immersion fire protection pipeline 16 corresponds to the battery cluster 12 one by one, and the liquid cooling pipeline 17 is communicated with the immersion fire protection pipeline 16 through a cluster-level solenoid valve 19, each battery pack 13 of the battery cluster 12 is communicated with the corresponding immersion fire protection pipeline 16 through a pack-level solenoid valve 18, and the pack-level solenoid valve 18 and the cluster-level solenoid valve 19 are communicatively connected to the control module of the corresponding battery cluster 12.

[0014] Among them, BMS (Battery Management System) is used to intelligently manage and maintain each battery unit, monitor the battery status, prevent the battery from overcharging and over-discharging, and extend the battery life. The energy storage system based on pack-level immersion fire management is provided with a fire protection system and a plurality of battery clusters 12 arranged at intervals in an energy storage box 11, and each battery cluster 12 includes a plurality of battery packs 13 stacked in sequence, a first-level BMS unit and a second-level BMS unit, and a high-voltage box 14 arranged below the battery pack 13, and the battery pack 13 includes a first-level BMS unit and a battery module, and the first-level BMS unit is communicatively connected with the battery module and the second-level BMS unit, so that the first-level BMS unit of each battery pack 13 of the same battery cluster 12 can separately collect and obtain the battery data of the battery module of the battery pack 13, so that the first-level BMS unit can timely and quickly obtain the battery data and transmit it to the second-level BMS unit of the battery cluster 12, so as to timely perform abnormal detection, timely firefighting, and improve the firefighting effect, and the use of BMS for detection can relatively reduce the number of detectors installed outside the battery pack 13, and the detection effect is more accurate and reliable, the first-level BMS unit corresponds to the battery pack 13 one by one, and the second-level BMS unit corresponds to the battery cluster 12 one by one, so that the corresponding battery cluster 12 and the battery module can be more accurately located. The position of the battery pack 13 can be accurately extinguished, and the detection and control between the battery clusters 12 will not interfere with each other, making the control of each battery cluster 12 more reliable; moreover, the immersion fire fighting pipeline 16 of the fire fighting system corresponds to the battery cluster 12 one by one, and is connected to the liquid cooling pipeline 17 through the cluster-level solenoid valve 19, so that the immersion fire fighting pipeline 16 and the cooling pipeline are shared, saving space and cost, and the liquid for immersion fire fighting is the liquid cooled by the liquid cooling unit 15, and the cooling effect is better, so as to improve the fire fighting effect; moreover, the use of liquid immersion fire fighting can avoid In order to reduce the risk of battery reignition after gas reaction and volatilization in gas fire fighting, each battery pack 13 is connected to the corresponding immersion fire fighting pipeline 16 through a pack-level solenoid valve 18, and the pack-level solenoid valve 18 and the cluster-level solenoid valve 19 are communicated with the control module provided in the high-voltage box 14 of the corresponding battery cluster 12 and connected to the secondary BMS unit, so as to accurately locate the fire fighting and avoid the risk of damage to the battery pack 13 in the entire cabin due to cabin-level fire fighting. It can also prevent the impact of spraying agents on battery packs 13 that have not experienced thermal runaway during cluster-level spraying fire fighting.

[0015] Specifically, in this embodiment, the battery pack 13 is provided with a liquid inlet 131 and a liquid outlet 132, the liquid cooling pipeline 17 includes a cooling water inlet primary pipeline 171, a cooling water inlet secondary pipeline 172, a cooling water return primary pipeline 173 and a cooling water return secondary pipeline 174, the cooling water inlet secondary pipeline 172 corresponds to the battery cluster 12 one by one, the cooling water inlet secondary pipeline 172 is connected to the liquid outlet end of the liquid cooling unit 15 through the cooling water inlet primary pipeline 171, and the cooling water inlet secondary pipeline 172 is connected to all battery packs of the corresponding battery cluster 12. The liquid inlet 131 of the battery pack 13 is connected, the cooling water return secondary pipeline 174 corresponds to the battery cluster 12 one by one, the cooling water return secondary pipeline 174 is connected to the return water inlet end of the liquid cooling unit 15 through the cooling water return primary pipeline 173, and the cooling water return secondary pipeline 174 is connected to the liquid outlet 132 of all battery packs 13 of the corresponding battery cluster 12, the immersion fire protection pipeline 16 corresponds to the cooling water inlet secondary pipeline 172 one by one, and the immersion fire protection pipeline 16 is connected to the cooling water inlet secondary pipeline 172 through the cluster-level solenoid valve 19. When the battery pack 13 is in a normal state, that is, the battery pack 13 has no thermal runaway, the liquid cooling unit 15 controls the cooling liquid to be output from the liquid outlet of the liquid cooling unit 15, and then flows to the cooling water inlet secondary pipeline 172 corresponding to each battery cluster 12 through the cooling water inlet primary pipeline 171 to the liquid inlet port 131 of each battery pack 13, and then flows to the cooling water return secondary pipeline 174 corresponding to each battery cluster 12 through the liquid outlet 132 of the battery pack 13, and then is transported to the liquid cooling unit 15 through the cooling water return primary pipeline 173. The return water inlet end is used to cool the battery pack 13 by cooling the liquid, thereby achieving the purpose of battery temperature control. When the battery pack 13 has thermal runaway, the cooling liquid in the cooling water inlet secondary pipeline 172 can flow to the immersion fire protection pipeline 16 through the opening of the cluster-level solenoid valve 19, and then flow into the battery pack 13 through the pack-level solenoid valve 18 to achieve immersion fire protection. The immersion fire protection pipeline 16 is shared with the liquid cooling pipeline 17, which saves space and cost. The liquid for immersion fire protection is cooling liquid, and the fire protection effect is better.

[0016] Specifically, in this embodiment, the pack-level solenoid valve 18 adopts a three-way solenoid valve. When the battery pack 13 has no thermal runaway, the two-way of the pack-level solenoid valve 18 is normally open, and the outlet of the pack-level solenoid valve 18 connected to the battery pack 13 is closed.

[0017] Specifically, the pack-level solenoid valves 18 of the same immersion fire protection pipeline 16 are connected in sequence, the cluster-level solenoid valve 19 is connected to the pack-level solenoid valve 18 at the first position, and a plug 101 is provided at the outlet of the pack-level solenoid valve 18 at the last position, and a leakage detection device is provided on the plug 101. Among them, the outlet of the pack-level solenoid valve 18 provided with the plug 101 is the outlet of the pack-level solenoid valve 18 that is not connected to the battery pack 13. The plug 101 generally refers to a sealing head, which refers to a component used to seal the end of a container to isolate the internal and external media, also known as an end cover. By providing a leakage detection device, it is possible to detect whether the pack-level solenoid valve 18 is leaking when all battery packs 13 in the battery cluster 12 are in a normal state, and it is possible to detect whether the cluster-level solenoid valve 19 is open when there is a battery pack 13 in thermal runaway in the battery cluster 12. When there is no battery pack 13 with thermal runaway in the battery cluster 12, the corresponding cluster-level solenoid valve 19 is in a closed state, and the cooling liquid cannot flow through. The cooling liquid only performs normal temperature control on the battery pack 13; when there is a battery pack 13 with thermal runaway in the battery cluster 12, the corresponding cluster-level solenoid valve 19 is in an open state, and the cooling liquid can flow to the corresponding pack-level solenoid valve 18 through the cluster-level solenoid valve 19 to enter the battery pack 13, and perform immersion fire protection on the battery pack 13. When the other battery packs 13 in the battery cluster 12 where the battery pack 13 with thermal runaway is located do not have thermal runaway, the two-way of the pack-level solenoid valve 18 is in a normally open state, and the outlet of the pack-level solenoid valve 18 connected to the battery pack 13 is in a closed state, so that when the cooling liquid flows through, since the pack-level solenoid valve 18 is not energized, the outlet of the pack-level solenoid valve 18 connected to the battery pack 13 is closed, and the cooling liquid can smoothly flow to the pack-level solenoid valve 18 corresponding to the next battery pack 13. The pack-level solenoid valve 18 adopts a three-way solenoid valve. When the pack-level solenoid valve 18 is energized, the three outlets of the pack-level solenoid valve 18 are all in an open state, and the outlet of the pack-level solenoid valve 18 connected to the battery pack 13 is in an open state, so that the cooling liquid can enter the corresponding battery pack 13 to achieve fire protection. At the same time, the cooling liquid can also flow to the pack-level solenoid valve 18 corresponding to the next battery pack 13.

[0018] Specifically, in this embodiment, the energy storage system based on pack-level immersion fire management also includes a liquid tank 102, and the liquid tank 102 is connected to the liquid cooling unit 15 through a liquid replenishing pipe 103 to replenish the liquid cooling unit 15, so that the system has sufficient liquid to immerse the battery pack 13 with thermal runaway, so that the cooling liquid can continuously enter the battery pack 13 with thermal runaway, so that the battery pack 13 is fully immersed and continuously cooled. Moreover, since the liquid is a cooling liquid, the cooling effect is better, thereby improving the fire fighting effect.

[0019] Specifically, the liquid replenishment pipe 103 is provided with a liquid replenishment solenoid valve 104, and the liquid cooling unit 15 is connected to the liquid replenishment pipe 103 via a liquid replenishment pump 105. The liquid tank 102, the liquid replenishment solenoid valve 104 and the liquid replenishment pump 105 constitute a liquid replenishment system 106.

[0020] Specifically, the energy storage system based on pack-level immersion fire management also includes a three-level BMS unit, which is arranged in the energy storage box 11. The three-level BMS unit is communicatively connected with the secondary BMS unit and the liquid cooling unit 15, so as to send a fire-fighting fluid replenishment instruction to the liquid cooling unit 15 according to the battery thermal runaway information received from the secondary BMS unit, thereby starting the fluid replenishment pump 105 and the fluid replenishment solenoid valve 104 to replenish the liquid cooling unit 15.

[0021] Specifically, the liquid cooling unit 15 includes a host, a cooling system 151, a heat exchanger 152 and a circulation system 153. The cooling system 151 is connected to the circulation system 153 through the heat exchanger 152. The cooling system 151 is used to cool the liquid cooling medium and then output it, so that the liquid cooling unit can output cooling liquid. The host is respectively communicated with the cooling system 151, the heat exchanger 152 and the circulation system 153 to control the operation of the cooling system 151, the heat exchanger 152 and the circulation system 153. The circulation system 153 includes a circulation pump 1531 and a pressure sensor 1532. The pressure sensor 1532 is arranged at the liquid outlet end of the liquid cooling unit 15. The circulation pump 1531 is connected to the return water inlet end of the liquid cooling unit 15 and the replenishing water inlet end of the liquid cooling unit 15. Among them, the flow rate of the liquid replenishment pump 105 is greater than the flow rate of the pack-level solenoid valve 18 on the immersion fire protection pipeline 16. By setting the pressure sensor 1532 for system pressure detection, it can prevent the immersion fire protection pipeline 16 of the battery pack 13 from stopping the injection due to excessive pressure based on the protection of the circulation system 153, and further ensure the fire protection effect. When the liquid cooling unit 15 receives the immersion fire protection instruction, the circulation pump 1531 and the cooling system 151 of the liquid cooling unit 15 can continue to work, so that the cooling liquid can continue to enter the thermal runaway battery pack 13, so that the battery pack 13 is fully immersed and continuously cooled.

[0022] Preferably, in some embodiments, the liquid cooling medium output by the liquid cooling unit 15 may be a fire extinguishing medium.

[0023] Based on the above design, when working, the fire management method of the energy storage system based on package-level immersion fire management includes the following steps:

[0024] Step S110, the primary BMS unit collects and records the battery data of the corresponding battery module, and transmits the battery data to the secondary BMS unit of the corresponding battery cluster; wherein the battery data includes battery pack information such as battery pack serial number and battery module voltage, voltage difference, temperature, temperature rise rate and / or temperature difference, etc., so that the secondary BMS unit can make abnormal data judgment based on the battery data;

[0025] Step S120, the secondary BMS unit determines whether there is abnormal data based on the received battery data to determine whether there is a battery pack with thermal runaway; wherein the secondary BMS unit stores preset voltage abnormal values, voltage difference normal values, temperature abnormal values, temperature rise rate abnormal values ​​and temperature difference abnormal values. When the battery data exceeds the corresponding abnormal value, it can be determined that abnormal data exists.

[0026] Step S130: When there is a battery pack with thermal runaway, the secondary BMS unit determines the battery pack with thermal runaway based on the abnormal data, accurately locates the battery pack with thermal runaway, and performs firefighting in time;

[0027] Step S140: The secondary BMS unit sends an immersion fire protection instruction to the control module of the corresponding battery cluster according to the information of the battery pack that has been determined to have thermal runaway;

[0028] Step S150: The control module controls the pack-level solenoid valve corresponding to the battery pack with thermal runaway to open, so that the cooling liquid can enter the corresponding battery pack through the corresponding pack-level solenoid valve, thereby achieving accurate battery immersion fire protection;

[0029] Step S160, the control module controls the cluster-level solenoid valve of the battery cluster where the battery pack with thermal runaway is located to open, and feeds back the status of the pack-level solenoid valve and the status of the cluster-level solenoid valve to the secondary BMS unit, so that the cooling liquid can enter the corresponding immersion fire protection pipeline through the corresponding cluster-level solenoid valve, thereby transporting the cooling liquid to the immersion fire protection pipeline corresponding to the battery cluster where the battery pack with thermal runaway is located, and then flows to the thermal runaway battery pack connected to the opened pack-level solenoid valve on the immersion fire protection pipeline, thereby realizing immersion fire protection of the battery pack.

[0030] Combination Figure 4 Specifically, after step S130, the following steps are further included:

[0031] Step S1301, the secondary BMS unit transmits the battery thermal runaway information to the tertiary BMS unit, and the tertiary BMS unit issues a fire-fighting liquid replenishment instruction to the liquid cooling unit; wherein, the fire-fighting liquid replenishment drive is performed by the tertiary BMS unit, so that the system can have enough cooling liquid to immerse the battery pack;

[0032] Step S1302: The host of the liquid cooling unit controls the liquid replenishment pump and the liquid replenishment solenoid valve to open;

[0033] Step S1303, the host of the liquid cooling unit determines whether the pressure exceeds the preset pressure threshold according to the pressure information collected by the pressure sensor; wherein, the flow of the liquid replenishment pump is greater than the flow of the pack-level solenoid valve on the immersion fire-fighting pipeline. By setting a pressure sensor for system pressure detection, it is possible to prevent the immersion fire-fighting pipeline of the battery pack from stopping filling due to excessive pressure based on the protection of the circulation system, thereby further ensuring the fire-fighting effect.

[0034] Step S1304: If yes, the host of the liquid cooling unit controls the liquid replenishing pump to stop.

[0035] Wherein, the step S1304 further includes: when the pressure is restored to not exceed the preset pressure threshold, the host of the liquid cooling unit controls the liquid replenishing pump to start, and returns to execute step S1303.

[0036] The step S1303 also includes: when the host of the liquid cooling unit determines that the pressure does not exceed the preset pressure threshold according to the pressure information collected by the pressure sensor, it returns to execute step S1302; when the coolant in the liquid tank is exhausted, the liquid replenishment pump is controlled to continue to be turned on, and the liquid replenishment pump is idle.

[0037] The step S1301 also includes: the third-level BMS unit sends a fire alarm signal.

[0038] In summary, the energy storage system based on pack-level immersion fire management of the utility model is provided with a fire protection system and a plurality of battery clusters arranged at intervals in the energy storage box, and each battery cluster includes a plurality of battery packs stacked up and down in sequence, a first-level BMS unit and a second-level BMS unit and a high-voltage box arranged below the battery pack, and the battery pack includes a first-level BMS unit and a battery module, and the first-level BMS unit is communicatively connected with the battery module and the second-level BMS unit, so that the first-level BMS unit of each battery pack of the same battery cluster can separately collect and obtain the battery data of the battery module of the battery pack, so that the first-level BMS unit can timely and quickly obtain the battery data and transmit it to the second-level BMS unit of the battery cluster, so as to timely perform abnormal detection, timely firefighting, and improve the firefighting effect, and the use of BMS for detection can relatively reduce the number of detectors installed outside the battery pack, and the detection effect is more accurate and reliable, the first-level BMS unit corresponds to the battery pack one by one, and the second-level BMS unit corresponds to the battery cluster One-to-one correspondence allows for more precise positioning of the corresponding battery clusters and battery packs, allowing for accurate fire extinguishing. Moreover, the immersion fire-fighting pipelines of the fire-fighting system correspond one-to-one to the battery clusters, and are connected to the liquid cooling pipelines through cluster-level solenoid valves, so that the immersion fire-fighting pipelines and cooling pipelines are shared, saving space and cost. The liquid for immersion fire-fighting is liquid cooled by a liquid cooling unit, and has a better cooling effect, thereby improving the fire-fighting effect. Moreover, the use of liquid immersion fire-fighting can avoid the risk of battery re-ignition after gas reaction and volatilization in gas fire-fighting. Each battery pack is connected to the corresponding immersion fire-fighting pipeline through a pack-level solenoid valve, and the pack-level solenoid valve and the cluster-level solenoid valve are communicated with the control module that is arranged in the high-voltage box of the corresponding battery cluster and is connected to the secondary BMS unit, so as to accurately locate the fire-fighting, avoid the risk of damage to the battery pack of the entire cabin caused by cabin-level fire-fighting, and prevent the impact of spraying agents on battery packs that have not experienced thermal runaway during cluster-level spraying fire-fighting.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An energy storage system based on package-level immersion fire management, characterized in that: include: Energy storage box; A plurality of battery clusters are arranged in the energy storage box at intervals, each of the battery clusters includes a plurality of battery packs, a first and a second BMS unit and a high-voltage box stacked in sequence from top to bottom, the high-voltage box is arranged below the battery pack located at the end, the battery pack includes a first-level BMS unit and a battery module, the first-level BMS unit is communicatively connected with the battery module and the second-level BMS unit, the high-voltage box is provided with a control module, and the control module is communicatively connected with the second-level BMS unit; A fire protection system is arranged in the energy storage box, and includes a liquid cooling unit, a liquid cooling pipeline and an immersion fire protection pipeline. The liquid cooling unit is connected to the battery pack through the liquid cooling pipeline. The immersion fire protection pipeline corresponds to the battery cluster one by one, and the liquid cooling pipeline is connected to the immersion fire protection pipeline through a cluster-level solenoid valve. Each battery pack of the battery cluster is connected to the corresponding immersion fire protection pipeline through a pack-level solenoid valve. The pack-level solenoid valve and the cluster-level solenoid valve are communicatively connected to the control module of the corresponding battery cluster.

2. The energy storage system based on package-level immersion fire management according to claim 1 is characterized in that: The battery pack is provided with a liquid inlet and a liquid outlet, and the liquid cooling pipeline includes a cooling water inlet primary pipeline, a cooling water inlet secondary pipeline, a cooling water return primary pipeline and a cooling water return secondary pipeline. The cooling water inlet secondary pipeline corresponds to the battery cluster one-to-one, the cooling water inlet secondary pipeline is connected to the liquid outlet end of the liquid cooling unit through the cooling water inlet primary pipeline, and the cooling water inlet secondary pipeline is connected to the liquid inlets of all battery packs of the corresponding battery cluster, the cooling water return secondary pipeline corresponds to the battery cluster one-to-one, the cooling water return secondary pipeline is connected to the return water inlet end of the liquid cooling unit through the cooling water return primary pipeline, and the cooling water return secondary pipeline is connected to the liquid outlet of all battery packs of the corresponding battery cluster, the immersion fire protection pipeline corresponds to the cooling water inlet secondary pipeline one-to-one, and the immersion fire protection pipeline is connected to the cooling water inlet secondary pipeline through the cluster-level solenoid valve.

3. The energy storage system based on package-level immersion fire management according to claim 1 is characterized in that: The pack-level solenoid valve adopts a three-way solenoid valve. When the battery pack has no thermal runaway, the two-way of the pack-level solenoid valve is in a normally open state, and the outlet of the pack-level solenoid valve connected to the battery pack is in a closed state.

4. The energy storage system based on package-level immersion fire management according to claim 3 is characterized in that: The package-level solenoid valves of the same immersion fire protection pipeline are connected in sequence.

5. The energy storage system based on package-level immersion fire management according to claim 4 is characterized in that: The cluster-level solenoid valve is communicated with the first-position package-level solenoid valve, and a plug is provided at the outlet of the last-position package-level solenoid valve, and a liquid leakage detection device is provided on the plug.

6. The energy storage system based on package-level immersion fire management according to claim 1, characterized in that: The energy storage system based on package-level immersion fire management also includes a liquid tank, which is connected to the liquid cooling unit through a liquid replenishment pipe.

7. The energy storage system based on packet-level immersion fire management according to claim 6, characterized in that: The liquid replenishing pipe is provided with a liquid replenishing solenoid valve, and the liquid cooling unit is connected with the liquid replenishing pipe through a liquid replenishing pump.

8. The energy storage system based on package-level immersion fire management according to claim 7 is characterized in that: The energy storage system based on pack-level immersion fire management also includes a three-level BMS unit, which is arranged in the energy storage box and is communicatively connected with the two-level BMS unit and the liquid cooling unit.

9. The energy storage system based on package-level immersion fire management according to claim 8, characterized in that: The liquid cooling unit includes a host, a cooling system, a heat exchanger and a circulation system. The cooling system is connected to the circulation system through the heat exchanger. The host is respectively communicated with the cooling system, the heat exchanger and the circulation system. The circulation system includes a circulation pump and a pressure sensor. The pressure sensor is arranged at the liquid outlet of the liquid cooling unit. The circulation pump is connected to the return water inlet end of the liquid cooling unit and the replenishing water inlet end of the liquid cooling unit.

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