Battery pack with fire extinguishing system, energy storage device and energy storage equipment

Abstract

The utility model discloses a battery pack with a fire extinguishing system, an energy storage device and energy storage equipment. The battery pack comprises a box body, a battery module, a battery management system and the fire extinguishing system, the battery management system is electrically connected with the battery module, and the battery management system is used for detecting the temperature data of each battery monomer and controlling the working state of the battery module; the fire fighting system comprises a detection module, a fire fighting pipeline and a plurality of sprayers, the fire fighting pipeline is connected with the box body, the sprayers are all connected to the fire fighting pipeline, and the detection module is electrically connected with the battery management system and is used for obtaining temperature data of all the collected battery monomers from the battery management system; the plurality of nozzles are controlled to be opened or closed according to the detection result of the detection module and the temperature data; the technical problems that wiring in an existing battery pack is complex, fire fighting efficiency is low, and the battery pack is high in cost and small in energy density due to the fact that a detection device is independently arranged are mainly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack with a fire protection system, an energy storage device and energy storage equipment. Background Art

[0002] With the development of lithium battery technology, electric vehicles, energy storage systems and other products have an increasing demand for lithium batteries. Among them, the safety of lithium batteries has always been a topic of concern. It is very important to safely reduce the risk and safely handle the lithium batteries in time after the thermal runaway of lithium batteries. Especially in the field of energy storage, due to the large total battery capacity, lithium batteries need to pay special attention to the fire protection of lithium batteries after thermal runaway, and handle the lithium batteries safely in time to avoid other safety risks and property losses. At present, energy storage devices all achieve overall fire protection through a fire cabinet. Each battery pack is connected to the fire cabinet. When it is determined that the battery pack has thermal runaway, the fire protection system is turned on to spray all battery packs. Such a design makes the wiring complex and increases the cost, the fire protection efficiency is low, and it is impossible to manage accurately. At the same time, a detection device for battery system detection needs to be set up separately in each battery pack, which greatly increases the detection cost of fire protection, and also occupies more space inside the battery pack, which greatly limits the energy density of each battery pack. Utility Model Content

[0003] The purpose of the utility model is to provide a battery pack, an energy storage device and an energy storage equipment with a fire protection system, mainly to solve the technical problems that the current battery pack wiring is complicated, the fire protection efficiency is low, and the separate setting of the detection device leads to high battery pack cost and low energy density.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A battery pack with a fire protection system, comprising a box, a battery module, a battery management system and a fire protection system;

[0006] The battery module includes a plurality of battery cells, the battery management system is electrically connected to the battery module, and the battery management system is at least used to detect the temperature data of each of the battery cells and control the working state of the battery module;

[0007] The fire protection system includes a detection module, a fire protection pipe and a plurality of nozzles. The fire protection pipe is connected to the box body, and the plurality of nozzles are connected to the fire protection pipe. The detection module is electrically connected to the battery management system and is used to obtain the collected temperature data of each battery cell from the battery management system, and is used to control the opening or closing of the plurality of nozzles according to the detection result of the detection module and the temperature data.

[0008] In one of the technical solutions, the fire protection system also includes a valve connected to the box, the valve is arranged on the fire protection pipe, the valve is electrically connected to the detection module, and is used to control the opening or closing of the valve according to the detection result of the detection module and the temperature data, so as to control the opening or closing of the multiple nozzles.

[0009] In one of the technical solutions, the fire protection pipeline includes a first pipeline, a second pipeline and a connector;

[0010] The first pipeline is connected to the valve, the second pipeline is located above the battery module and fixedly connected to the box, the connecting piece is connected to the first pipeline and the second pipeline respectively, and the plurality of nozzles are connected to the second pipeline.

[0011] In one of the technical solutions, the box body has a first end and a second end opposite to each other along a first direction, the first pipe and the valve are arranged at the first end of the box body, a plurality of support columns extend upward from the bottom of the box body and are arranged at intervals along the first direction, and the second pipe is fixedly connected to the top ends of the plurality of support columns respectively to extend from the first end to the second end of the box body.

[0012] In one of the technical solutions, the battery modules are arranged on both sides of the support column, and the multiple nozzles are divided into two groups, one group of nozzles is directed toward the battery module on one side, and the other group of nozzles is directed toward the battery module on the other side.

[0013] In one of the technical solutions, the spraying direction of each of the nozzles is tilted downward at a preset angle θ, and the preset angle θ≤45°; the second pipe exceeds the preset height h of the battery module, and the preset height h ranges from 1 / 3*w*tanθ to 2 / 3*w*tanθ, where w is the width of the battery module.

[0014] In one of the technical solutions, the spraying direction of each of the nozzles is inclined upward at 45 degrees, and the height of the second pipe is less than or equal to the height of the battery module.

[0015] In one of the technical solutions, the detection module is integrated into the battery management system, and the detection module includes a control module and a detector for detecting carbon monoxide or smoke VOC in the box. The detector is electrically connected to the control module, and the control module is used to control the opening or closing of multiple nozzles according to the detection results of the detector and the temperature data.

[0016] The present application also provides an energy storage device, including a first liquid inlet pipe, multiple second liquid inlet pipes and multiple battery packs with fire protection systems as described in the above technical solution, each of the second liquid inlet pipes is connected to a valve on a corresponding battery pack, multiple second liquid inlet pipes are connected to the first liquid inlet pipe, and the first liquid inlet pipe is used to divert liquid to the multiple second liquid inlet pipes.

[0017] The present application also provides an energy storage device, comprising a plurality of the energy storage devices described above.

[0018] Compared with the prior art, the battery pack with a fire protection system provided by the utility model has at least the following beneficial effects:

[0019] The fire protection system of the present solution abandons the traditional detection device that directly detects the temperature of each battery cell, and obtains the temperature data of each battery cell from the existing battery management system (also known as BMS in this field). In other words, the detection module of the present solution does not directly detect the temperature data of each battery cell, but indirectly obtains the temperature data of each battery cell by being electrically connected to the battery management system. On the one hand, since the detection device that directly detects the temperature of each battery cell is abandoned, the cost of the fire protection system can be reduced. In addition, compared with the temperature detection device in the fire protection system in the prior art, the battery cell temperature data in the battery management system is more accurate, thereby improving the overall safety. On the other hand, the volume of the detection module adopted in the present solution can be made smaller than the volume of the entire traditional detection device. In particular, when the detection module is integrated in the battery management system, the space utilization rate inside the battery pack will be greatly improved, thereby greatly improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of the structure of a battery pack with a fire protection system provided in Example 1 of the present application;

[0022] Figure 2 for Figure 1 The schematic diagram of the structure of the battery pack shown below after the battery module is hidden;

[0023] Figure 3 A schematic diagram of a battery management system integrated with a detection module provided in Embodiment 1 of the present application;

[0024] Figure 4 A flowchart of the fire protection system of the battery pack provided in Example 1 of the present application;

[0025] Figure 5 A schematic diagram of the structure of an energy storage device provided in Example 2 of the present application;

[0026] Figure 6 A schematic diagram of the structure of an energy storage device provided in Example 3 of the present application.

[0027] Among them, the reference numerals in the figure are:

[0028] 10. Battery pack; 1. Box; 11. Support column; 2. Battery module; 21. Battery cell; 3. Battery management system; 4. Fire protection system; 41. Detection module; 411. Detector; 42. Control module; 43. Fire protection pipeline; 431. First pipeline; 432. Second pipeline; 433. Connector; 44. Sprinkler; 45. Valve;

[0029] 20. First liquid inlet pipe; 30. Second liquid inlet pipe; 100. Energy storage device. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to 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 application.

[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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Embodiment 1

[0036] Please also read Figures 1 to 3 This embodiment provides a battery pack with a fire protection system, which mainly includes a box body 1, a battery module 2, a battery management system 3 and a fire protection system 4.

[0037] The battery module 2, the battery management system 3 and the fire protection system 4 are all connected to the box 1. The battery module 2 includes a plurality of battery cells 21. The plurality of battery cells 21 can be connected in series in sequence so that the battery module 2 has a larger amount of electricity.

[0038] Among them, the battery management system 3 is an existing technology. The battery management system 3 is at least used to detect the temperature data of each battery cell 21 and control the working state of the battery module 2 such as charging, discharging, and cutting. Specifically, the battery management system 3 is also called BMS (Battery management system). The battery management system 3 and each battery cell 21 are electrically connected. The battery management system 3 can detect the voltage, current, temperature and other data of the battery cell 21 in real time. BMS can be regarded as the "brain" of the battery pack. BMS is mainly composed of CMU (Cell monitor Unit) and BMU (Battery management Unit). CMU, also known as the cell monitoring unit, is responsible for measuring the voltage, current, temperature and other parameters of each battery cell 21, and also has functions such as balancing. When CMU measures these data, it transmits the data to BMU. BMU, also known as the battery management unit, is responsible for evaluating the data transmitted by CMU. If the data is abnormal, the battery cell 21 is protected, a request to reduce the current is issued, or the charging and discharging path is cut off to prevent the battery cell 21 from exceeding the permitted conditions of use. At the same time, the power and temperature of the battery cell 21 are also managed.

[0039] Among them, the fire protection system 4 specifically includes a detection module 41, a fire protection pipe 43 and a plurality of nozzles 44. The detection module 41 is electrically connected to the above-mentioned battery management system 3. The detection module 41 is used to obtain the temperature data of each battery cell 21 collected from the battery management system 3, and the fire protection pipe 43 is fixed in the box 1. The plurality of nozzles 44 are connected to the fire protection pipe 43. The detection module 41 is electrically connected to the battery management system 3 and is used to obtain the temperature data of each battery cell 21 collected from the battery management system 3. The opening or closing of the plurality of nozzles 44 can be controlled according to the detection result of the detection module 41 and the above-mentioned temperature data. Optionally, when the temperature data obtained by the detection module 41 from the battery management system 3 is abnormal, the detection module 41 will control the plurality of nozzles 44 to open immediately to spray the battery module 2, so that the thermal runaway of the battery module 2 will not continue to spread, reduce the risk of fire, and improve safety. Alternatively, when the detection result obtained by the detection module 41 itself is abnormal, the detection module 41 controls multiple nozzles 44 to open, so as to spray the battery module 2, thereby improving the spraying effect. There is no limit on the number of nozzles 44, which can be set as needed. Optionally, the nozzles 44 can be evenly distributed along the arrangement direction of the battery cells 21, so that multiple battery cells 21 can be evenly covered, further improving the spraying efficiency and spraying effect.

[0040] As can be seen from the above paragraph, this solution abandons the traditional fire detection device, and instead adopts a solution to obtain the temperature data of each battery cell 21 from the existing battery management system 3 (i.e., BMS). In other words, the detection module 41 of this solution does not directly obtain the temperature data of each battery cell 21, but indirectly obtains the temperature data of each battery cell 21 by being electrically connected to the battery management system 3. On the one hand, since the detection device that directly detects the temperature of each battery cell 21 is abandoned, the cost of the battery pack can be reduced, and at the same time, the temperature data of the battery cells in the battery management system is more accurate, which improves safety. On the other hand, the volume of the detection module 41 used in this solution can be made smaller than the volume of the entire traditional detection device, especially when the detection module 41 is integrated in the battery management system 3, the space utilization rate inside the battery pack will be greatly improved, thereby greatly improving the energy density of the battery pack. In addition, since the detection module 41 is integrated in the battery management system 3 of each battery pack, there is no need for communication lines to connect, which simplifies the line connection and makes the overall assembly simpler and more convenient.

[0041] In this embodiment, the fire protection system 4 also includes a valve 45 connected to the box 1, and the valve 45 is arranged on the fire protection pipe 43. The valve 45 is also electrically connected to the detection module 41. The detection module 41 is used to control the valve 45 to open or close according to the detection result and temperature data of the detection module 41, so as to control the opening or closing of multiple nozzles 44. Specifically, when the temperature data obtained by the detection module 41 is abnormal, the detection module 41 will control the valve 45 to open, so that the multiple nozzles 44 are in an open state to spray the battery module 2; when the temperature data obtained by the detection module 41 is not abnormal, the valve 45 will always be in a closed state, and the multiple nozzles 44 are in a closed state not spraying the battery module 2. By arranging the electric valve 45 on the battery pack, when the temperature data obtained by the detection module 41 is abnormal, the out-of-control battery module 2 can be sprayed quickly, that is, the reaction time of fire extinguishing is shortened and the timeliness of fire extinguishing is improved. The temperature data obtained by the battery management system 3 is more accurate and timely because of the large number of collected data and the proximity to the battery cells 21, thus further improving the overall safety.

[0042] In this embodiment, the detection module 41 includes a control module 42 and a detector 411 for detecting carbon monoxide or smoke VOC in the box 1. The detector 411 is electrically connected to the control module 42, and the valve 45 is electrically connected to the control module 42. The control module 42 is used to control the opening or closing of the valve 45 according to the detection result of the detector 411 and the above temperature data, so as to control the opening or closing of the multiple nozzles 44. Figure 4 In this embodiment, preferably, as long as at least one of the temperature data, carbon monoxide content and smoke VOC content obtained by the detection module 41 does not meet the standard, the control module 42 will immediately control the valve 45 to open, so as to further improve the timeliness of fire extinguishing, further reduce the risk of fire, and further improve safety.

[0043] In this embodiment, the fire protection pipe 43 specifically includes a first pipe 431, a second pipe 432 and a connector 433, wherein the first pipe 431 is connected to the valve 45, the second pipe 432 is located above the battery module 2 and is fixedly connected to the box body 1, and the connector 433 connects the first pipe 431 and the second pipe 432 respectively, so that the first pipe 431 and the second pipe 432 are interconnected, and the above-mentioned multiple nozzles 44 are all arranged on the second pipe 432. By setting the connector 433, the convenience of installation and maintenance can be improved, and the overall applicability can be improved. As long as the second pipe 432 is replaced, it can be applied to different battery modules 2. By pre-fixing the second pipe 432 on the box body 1, the assembly operation of the battery pack as a whole is facilitated, ensuring that the battery pack has a high assembly efficiency. In addition, the structural strength of the connector 433 needs to meet a certain number of plug-in and unplug times, and at the same time meet the IP67 waterproof level to prevent leakage.

[0044] In this embodiment, the box body 1 has a first end and a second end opposite to each other along a first direction, the first pipe 431 and the valve 45 are arranged at the first end of the box body, a plurality of support columns 11 extend upward from the bottom of the box body 1 and are arranged at intervals along the first direction, and the second pipe 432 is fixedly connected to the top ends of the plurality of support columns 11 respectively to extend from the first end to the second end of the box body 1. Figure 2 As shown, the box body 1 is provided with a plurality of support columns 11 extending upward, and the second pipe 432 can be fixed to the top of the plurality of support columns 11 by welding or snapping. The plurality of battery cells 21 are arranged along the first direction, and the second pipe 432 also extends along the first direction, so the second pipe 432 can extend along the arrangement direction of the battery cells 21, thereby simplifying the second pipe 432, shortening the pipe length, reducing the flow resistance and improving the fire fighting efficiency, and the plurality of nozzles 44 can be directly distributed at intervals along the first direction, and the distribution density of the nozzles 44 can be set as needed, so as to facilitate targeted fire fighting control.

[0045] In this embodiment, battery modules 2 are arranged on both sides of the support column 11, and multiple nozzles 44 are divided into two groups, one group of nozzles 44 sprays toward the battery module 2 on one side, and the other group of nozzles 44 sprays toward the battery module 2 on the other side. Each battery module 2 has multiple battery cells 21 arranged along the first direction, and multiple nozzles 44 are divided into two groups to spray two battery modules 2, so that the battery modules 2 arranged side by side on both sides can be covered by multiple nozzles 44, thereby improving the overall spraying effect. At the same time, only the second pipe 432 is needed to connect the two groups of nozzles 44 at the same time, simplifying the pipeline design and improving the assembly efficiency. The positions of the two groups of nozzles 44 can be the same, or they can be staggered, and can be set as needed, thereby improving the adaptability of the overall structure.

[0046] In one embodiment, the spraying direction of each nozzle 44 is tilted downward at a preset angle θ, and the preset angle is 30°≤θ≤45°; the second pipe 432 exceeds the preset height h of the battery module 2, and the preset height h ranges from 1 / 3*w*tanθ to 2 / 3*w*tanθ, where w is the width of the battery module 2. Among them, the width of the battery module 2 is perpendicular to the first direction. It can be understood that when the nozzle 44 sprays downward, in order to prevent the spraying area of ​​the nozzle 44 from being too small to cover the entire battery cell 31, the height of the second pipe 432 is set to be higher than the battery module 2, so that the height of the nozzle 44 is set so that it can spray to the center of the upper surface of the battery cell 21. Since the explosion-proof port is set in the center of the upper surface of the battery cell 21, the spraying area of ​​the nozzle 44 is aligned with the explosion-proof port, which is more conducive to improving the fire fighting effect. At the same time, in order to prevent the preset height h of the second pipe 432 from being too large and causing the overall volume to be too large, the preset angle of the nozzle 44 is set to be less than or equal to 45°. Furthermore, when the width w of the battery module 2 is constant, the smaller the downward tilt angle of the nozzle 44, the smaller the preset height h, the farther the spraying area of ​​the nozzle 44 is from the nozzle, and the greater the pumping pressure required to control the spraying. Therefore, in order to prevent the spraying area from deviating and reduce the cost of the water pump, the preset angle is greater than or equal to 30°.

[0047] In another optional example, the spraying direction of each nozzle 44 is inclined upward at 45°, and the height of the second pipe 432 is less than or equal to the height of the battery module 2. In this case, since the spraying area can be controlled by the upwardly inclined nozzle to cover the upper surface of the battery cell 21, there is no need to set the height of the second pipe 432 higher than the height of the battery module 2, that is, the preset height h is less than or equal to 0, which can reduce the overall space occupation and simplify the structure.

[0048] In summary, the battery pack of this embodiment has the advantages of simpler structure, easy disassembly of the fire protection system, high energy density, low cost, high fire extinguishing timeliness and high safety.

[0049] Embodiment 2

[0050] See also Figure 5This embodiment provides an energy storage device, including a first liquid inlet pipe 20, a plurality of second liquid inlet pipes 30, and a plurality of battery packs 10 with a fire protection system as described in the first embodiment, wherein each second liquid inlet pipe 30 is connected to a valve 45 on a corresponding battery pack 10, and the plurality of second liquid inlet pipes 30 are respectively connected to the first liquid inlet pipe 20, and when the fire protection liquid is introduced into the first liquid inlet pipe 20, the fire protection liquid will be diverted to each second liquid inlet pipe 30. When one of the battery packs 10 has thermal runaway, the detection module 41 (i.e., the control module 42 in the detection module 41) inside the battery pack 10 having thermal runaway will control the valve 45 thereon to open, and at this time, the fire protection liquid will enter the battery pack 10 having thermal runaway from the second liquid inlet pipe 30, and spray the battery pack 10 having thermal runaway. In other words, each battery pack 10 in the energy storage device of the present solution performs independent detection on the battery cells inside it, and each battery pack 10 has no communication relationship in fire fighting, which simplifies the overall circuit and facilitates management. The detection of the internal battery cells 21 by each battery pack 10 does not interfere with each other, thereby improving the timeliness of fire fighting and thus improving the safety of the energy storage device.

[0051] Embodiment 3

[0052] See also Figure 6 This embodiment provides an energy storage device, which includes multiple energy storage devices 100 described in the above-mentioned second embodiment due to its large power. The energy storage device of this embodiment may also include a main pipeline, and the first liquid inlet pipe 20 inside each energy storage device 100 is connected to the main pipeline. When the fire-fighting liquid is introduced into the main pipeline, the fire-fighting liquid will first be diverted to the first liquid inlet pipe 20 of each energy storage device 100, and then diverted to each second liquid inlet pipe 30 along each first liquid inlet pipe 20. Through such a design, while ensuring that there are multiple battery packs 10 with a large power, it can still ensure that the fire-fighting has good timeliness and improve the safety of the use of the energy storage device.

[0053] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery pack with a fire protection system, characterized in that: It comprises a box (1), a battery module (2), a battery management system (3) and a fire protection system (4); The battery module (2) comprises a plurality of battery cells (21), the battery management system (3) is electrically connected to the battery module (2), and the battery management system (3) is at least used to detect temperature data of each of the battery cells (21) and control the working state of the battery module (2); The fire protection system (4) comprises a detection module (41), a fire protection pipe (43) and a plurality of nozzles (44); the fire protection pipe (43) is connected to the box (1); the plurality of nozzles (44) are connected to the fire protection pipe (43); the detection module (41) is electrically connected to the battery management system (3) and is used to obtain the collected temperature data of each battery cell (21) from the battery management system (3); and is used to control the opening or closing of the plurality of nozzles (44) according to the detection result of the detection module (41) and the temperature data.

2. The battery pack with a fire protection system as claimed in claim 1, characterized in that: The fire protection system (4) further comprises a valve (45) connected to the box body, wherein the valve (45) is arranged on the fire protection pipe (43), and the valve (45) is electrically connected to the detection module (41), and is used to control the opening or closing of the valve (45) according to the detection result of the detection module (41) and the temperature data, so as to control the opening or closing of the plurality of nozzles (44).

3. The battery pack with a fire protection system as claimed in claim 2, characterized in that: The fire fighting pipeline (43) comprises a first pipeline (431), a second pipeline (432) and a connecting piece (433); The first pipeline (431) is connected to the valve (45), the second pipeline (432) is located above the battery module (2) and fixedly connected to the box (1), the connecting piece (433) is connected to the first pipeline (431) and the second pipeline (432) respectively, and the plurality of nozzles (44) are connected to the second pipeline (432).

4. The battery pack with a fire protection system as claimed in claim 3, characterized in that: The box body (1) has a first end and a second end opposite to each other along a first direction; the first pipe (431) and the valve (45) are arranged at the first end of the box body (1); a plurality of support columns (11) extend upward from the bottom of the box body (1) and are arranged at intervals along the first direction; and the second pipe (432) is respectively fixedly connected to the top ends of the plurality of support columns (11) to extend from the first end to the second end of the box body (1).

5. The battery pack with a fire protection system as claimed in claim 4, characterized in that: The battery modules (2) are arranged on both sides of the support column (11), and the plurality of nozzles (44) are divided into two groups, wherein one group of nozzles (44) faces the battery module (2) on one side, and the other group of nozzles (44) faces the battery module (2) on the other side.

6. The battery pack with a fire protection system as claimed in claim 3, characterized in that: The spraying direction of each of the nozzles (44) is tilted downward at a preset angle θ, wherein the preset angle θ is ≤ 45°; the second pipe (432) exceeds a preset height h of the battery module (2), wherein the preset height h ranges from 1 / 3*w*tanθ to 2 / 3*w*tanθ, wherein w is the width of the battery module (2).

7. The battery pack with a fire protection system as claimed in claim 3, characterized in that: The spraying direction of each of the spray heads (44) is inclined upward at 45°, and the height of the second pipe (432) is less than or equal to the height of the battery module (2).

8. The battery pack with a fire protection system according to any one of claims 1 to 7, characterized in that: The detection module (41) is integrated into the battery management system (3), and comprises a control module (42) and a detector (411) for detecting carbon monoxide or smoke VOC in the box, the detector (411) is electrically connected to the control module (42), and the control module (42) is used to control the opening or closing of the plurality of nozzles (44) according to the detection result of the detector (411) and the temperature data.

9. An energy storage device, characterized in that: The invention comprises a first liquid inlet pipe (20), a plurality of second liquid inlet pipes (30) and a plurality of battery packs (10) with a fire protection system according to any one of claims 2 to 6, each of the second liquid inlet pipes (30) is connected to a valve (45) on a corresponding battery pack (10), a plurality of the second liquid inlet pipes (30) are all connected to the first liquid inlet pipe (20), and the first liquid inlet pipe (20) is used for diverting liquid to the plurality of the second liquid inlet pipes (30).

10. An energy storage device, characterized in that: The invention comprises a plurality of energy storage devices (100) as claimed in claim 9.

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