Energy storage battery cluster and energy storage system

Abstract

The utility model provides an energy storage battery cluster and an energy storage system, and relates to the technical field of energy storage. The energy storage battery cluster comprises a plurality of battery packs, a detection pipeline and a pressure detection unit; the detection pipeline is respectively connected with the plurality of battery packs; the pressure detection unit is connected with the detection pipeline. When any one battery pack is subjected to thermal runaway, gas in the battery pack is heated to expand, so that the pressure in the detection pipeline is increased. The pressure detection unit is used for detecting the pressure in the detection pipeline so as to judge whether thermal runaway of the battery pack occurs or not, and the thermal runaway is used as a basis for the fire-fighting host to start whole cluster fire fighting. And the states of a plurality of battery packs can be monitored only by arranging one pressure detection unit, so that the cost is lower. The pressure detection unit can be used in cooperation with a temperature probe of the BMS in the battery pack, and the reliability is higher. In addition, the pressure detection unit is arranged outside the battery pack, so that maintenance and replacement are facilitated, and the after-sales difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to an energy storage battery cluster and an energy storage system. Background Art

[0002] Currently, there are two main methods for performing fire detection on the liquid-cooled battery packs of energy storage battery clusters.

[0003] One is to install smoke and temperature sensors or composite detectors in the liquid-cooled battery pack. When the liquid-cooled battery pack is in thermal runaway, gas and particulate matter will be generated, which will be sensed by the sensor. The sensor sends the detected information to the fire host, which will start the entire cluster fire.

[0004] However, the service life of smoke and temperature sensors or composite detectors is short, which cannot keep pace with the life of the entire energy storage battery cluster. They are also difficult to provide after-sales services and inconvenient to install and disassemble. In addition, the cost of such sensors is high, which is not conducive to market competition, and they are easily affected by electromagnetic interference, resulting in false alarms, which increases the uncertainty of the system.

[0005] The second is to use the temperature probe in the liquid-cooled battery pack of the BMS (BATTERY MANAGEMENT SYSTEM) to collect temperature information as the start-up information of the fire host. When the temperature of the liquid-cooled battery pack reaches the set condition, the fire host starts the whole cluster fire.

[0006] However, the solution of only relying on the temperature probe of the BMS in the liquid-cooled battery pack as the whole cluster fire start-up has too simple start-up logic judgment conditions. For example, if the liquid-cooled battery pack has thermal runaway after the BMS is powered off, the risk of the fire host not starting is too high. This solution relies too much on the logical judgment of the BMS, is not reliable enough, and has high risks.

[0007] In summary, existing fire detection solutions have the problems of high cost, low reliability and difficult after-sales service. Utility Model Content

[0008] In order to solve the problems of high cost, low reliability and difficult after-sales service in the existing fire detection solutions, one of the purposes of the utility model is to provide an energy storage battery cluster.

[0009] The utility model provides the following technical solutions:

[0010] An energy storage battery cluster, comprising:

[0011] Multiple battery packs;

[0012] Detection pipelines are respectively connected to the plurality of battery packs; and

[0013] The pressure detection unit is connected to the detection pipeline and is used to detect the pressure in the detection pipeline.

[0014] As a further optional solution for the energy storage battery cluster, the battery pack has a pressure relief port, and the detection pipeline is connected to the pressure relief ports of a plurality of the battery packs respectively.

[0015] As a further optional solution for the energy storage battery cluster, the pressure detection unit includes a pipeline and a liquid level sensor;

[0016] The pipeline includes a first pipe section connected to the detection pipeline and a second pipe section connected to the outside, the first pipe section and the second pipe section both extend downward and are connected through a bend, and there is liquid in the pipeline, and the liquid level is higher than the top pipe wall at the lowest point of the bend;

[0017] The liquid level sensor is disposed close to the bending portion and is used to detect whether the liquid level is higher or lower than the liquid level sensor.

[0018] As a further optional solution for the energy storage battery cluster, a liquid level scale is provided on the first pipe section or the second pipe section.

[0019] As a further optional solution for the energy storage battery cluster, a plurality of the battery packs are stacked, the detection pipeline is vertically arranged, and the top end of the detection pipeline is connected to the pipeline.

[0020] As a further optional solution for the energy storage battery cluster, a pressure balancing valve is provided on the detection pipeline.

[0021] As a further optional solution for the energy storage battery cluster, the pressure detection unit includes a pressure sensor, and the pressure sensor is arranged in the detection pipeline.

[0022] As a further optional solution for the energy storage battery cluster, the pressure detection unit includes a cylinder, a piston, an elastic member and a sensing member;

[0023] The cylinder is connected to the detection pipeline, the piston is slidably disposed in the cylinder, and the piston is connected to the inner wall of the cylinder through the elastic member;

[0024] The sensing element is disposed on the cylinder body and senses the piston when the piston slides to a preset position.

[0025] As a further optional solution for the energy storage battery cluster, a pressure balance hole is provided on the cylinder body, and the pressure balance hole is connected with the inner cavity of the cylinder body close to one end of the detection pipeline when the piston slides to the preset position.

[0026] As a further optional solution for the energy storage battery cluster, the induction member is a metal contact, and the metal contact is in contact with the piston and is connected when the piston slides to the preset position.

[0027] As a further optional solution for the energy storage battery cluster, an explosion-proof valve is provided on the detection pipeline.

[0028] As a further optional solution for the energy storage battery cluster, the explosion-proof valve is a solenoid valve, and the solenoid valve is electrically connected to the pressure detection unit.

[0029] Another object of the utility model is to provide an energy storage system.

[0030] The utility model provides the following technical solutions:

[0031] An energy storage system comprises a fire-fighting module and the above-mentioned energy storage battery cluster, wherein the pressure detection unit is electrically connected to the fire-fighting module.

[0032] The embodiments of the present utility model have the following beneficial effects:

[0033] In the above-mentioned energy storage battery cluster, the detection pipeline is connected to multiple battery packs respectively. When any battery pack has thermal runaway, the gas in the battery pack will expand due to heat, which will cause the pressure in the detection pipeline to rise. On this basis, the pressure detection unit is used to detect the pressure in the detection pipeline to determine whether any battery pack has thermal runaway, which is then used as the basis for the fire host to start the firefighting of the entire cluster. Therefore, only one pressure detection unit is needed to monitor the status of multiple battery packs, which is less costly. At the same time, compared with the existing design that only relies on the temperature probe of the BMS in the battery pack as the whole cluster fire start-up solution, the pressure detection unit can be used in conjunction with the temperature probe of the BMS in the battery pack, which is more reliable. In addition, the pressure detection unit is arranged on the outside of the battery pack, which is convenient for maintenance and replacement, reducing the difficulty of after-sales.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1The overall structure diagram of an energy storage battery cluster provided by an embodiment of the utility model is shown;

[0037] Figure 2 A front view of an energy storage battery cluster provided by an embodiment of the utility model is shown;

[0038] Figure 3 A schematic diagram showing the structure of a detection pipeline and a pressure detection unit in an energy storage battery cluster provided by an embodiment of the utility model is shown;

[0039] Figure 4 A schematic structural diagram of a pressure detection unit in an energy storage battery cluster provided by an embodiment of the utility model in another embodiment is shown.

[0040] Description of main component symbols:

[0041] 100-battery pack; 200-detection pipeline; 210-three-way connector; 220-branch pipe; 300-pressure detection unit; 310-pipeline; 311-first pipe section; 312-bending part; 313-second pipe section; 314-liquid level scale; 320-liquid level sensor; 330-connecting pipe; 340-cylinder body; 341-first chamber; 342-second chamber; 343-pressure balance hole; 344-limiting part; 350-piston; 360-elastic part; 370-sensing part. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] Example

[0048] Please also read Figure 1 and Figure 2 The present embodiment provides an energy storage battery cluster, specifically an energy storage liquid-cooled battery cluster. The energy storage battery cluster includes a battery pack 100, a detection pipeline 200 and a pressure detection unit 300.

[0049] There are multiple battery packs 100 , and accordingly, the detection pipelines 200 are connected to the respective battery packs 100 , respectively, and communicate with the inner cavities of the respective battery packs 100 .

[0050] In addition, the pressure detection unit 300 is connected to the detection pipeline 200 and is used to detect the pressure in the detection pipeline 200 .

[0051] When any battery pack 100 experiences thermal runaway, the gas in the battery pack 100 expands due to heat, which will cause the pressure in the detection pipeline 200 to rise. On this basis, the pressure detection unit 300 is used to detect the pressure in the detection pipeline 200 to determine whether any battery pack 100 has experienced thermal runaway, which serves as the basis for the fire host to start the entire cluster fire.

[0052] Therefore, only one pressure detection unit 300 is needed to monitor the status of multiple battery packs 100, which is more cost-effective. At the same time, compared with the existing design that only relies on the temperature probe of the BMS in the battery pack 100 as the whole cluster fire start solution, the pressure detection unit 300 can be used in conjunction with the temperature probe of the BMS in the battery pack 100, which is more reliable. In addition, the pressure detection unit 300 is set outside the battery pack 100, which is convenient for maintenance and replacement, reducing the difficulty of after-sales.

[0053] In some embodiments, each battery pack 100 has a pressure relief port, and the detection line 200 is specifically connected to the pressure relief port of each battery pack 100 .

[0054] Specifically, a plurality of battery packs 100 are stacked, and the pressure relief ports of the battery packs 100 are aligned in the vertical direction.

[0055] Correspondingly, the detection pipeline 200 is vertically arranged and is connected with each pressure relief port in sequence along the vertical direction.

[0056] In other embodiments, the detection line 200 may also penetrate from other positions of the side wall of the battery pack 100 to connect with the inner cavity of the battery pack 100 .

[0057] Please also read Figure 2 and Figure 3 In some specific embodiments, the detection pipeline 200 is composed of a three-way connector 210 and a branch pipe 220.

[0058] The number of three-way connectors 210 and battery packs 100 is the same and corresponds to each other. The three-way connector 210 is fixedly connected to the corresponding battery pack 100, and the inner cavity of the three-way connector 210 is connected to the pressure relief port.

[0059] The number of branch pipes 220 is one less than the number of three-way connectors 210, and each branch pipe 220 is respectively connected to two adjacent three-way connectors 210. In the vertical direction, the three-way connectors 210 and the branch pipes 220 are arranged alternately.

[0060] See also Figure 3 In some embodiments, the pressure detection unit 300 includes a pipe 310 and a liquid level sensor 320 .

[0061] The pipeline 310 includes a first pipe section 311 connected to the detection pipeline 200 , a second pipe section 313 communicating with the outside, and a bending portion 312 , and the first pipe section 311 and the second pipe section 313 both extend downward and communicate through the bending portion 312 .

[0062] In addition, there is liquid in the pipe 310 , and the liquid level is higher than the top pipe wall at the lowest point of the bending portion 312 .

[0063] Accordingly, the liquid level sensor 320 is disposed close to the bending portion 312 to detect whether the liquid level is higher or lower than the liquid level sensor 320 .

[0064] In the initial state, the pressure in the detection pipeline 200, the pressure in the first pipe section 311, and the pressure in the second pipe section 313 are all equal to the external environmental pressure. When a battery pack 100 experiences thermal runaway, the pressure in the detection pipeline 200 rises, and the pressure in the first pipe section 311 rises accordingly. Under the action of the pressure difference, the liquid in the bend 312 is pressed into the second pipe section 313, causing the liquid level in the first pipe section 311 to drop and the liquid level in the second pipe section 313 to rise.

[0065] At this time, the liquid level sensor 320 arranged in the first pipe section 311 detects that the liquid level changes from a state higher than the liquid level sensor 320 to a state lower than the liquid level sensor 320, or the liquid level sensor 320 arranged in the second pipe section 313 detects that the liquid level changes from a state lower than the liquid level sensor 320 to a state higher than the liquid level sensor 320, thereby detecting the pressure change in the detection pipeline 200.

[0066] Optionally, the first tube section 311 , the bending portion 312 and the second tube section 313 are integrally formed to form a U-shaped tube.

[0067] Furthermore, a liquid level scale 314 is provided on the first pipe section 311 or the second pipe section 313 .

[0068] Before being put into use, the energy storage battery cluster may be calibrated to operate under different working conditions, and the readings of the liquid level scale 314 under each working condition are read, and then a series of liquid level thresholds are set according to the readings of the liquid level scale 314 .

[0069] Exemplarily, the first threshold, the second threshold and the third threshold are set in sequence from low to high, corresponding to the three liquid level sensors 320. When the liquid level sensor 320 corresponding to the first threshold detects a change in the liquid level, it indicates that the temperature of the battery pack 100 has risen. At this time, the battery pack 100 is in a normal charge and discharge state. When the liquid level sensor 320 corresponding to the second threshold detects a change in the liquid level, it indicates that the battery pack 100 is close to a thermal runaway state and there is a risk of thermal runaway. When the liquid level sensor 320 corresponding to the third threshold detects a change in the liquid level, it indicates that the battery pack 100 is already in a thermal runaway state and the entire cluster fire protection needs to be started.

[0070] Furthermore, considering that the pipe 310 has a certain volume, in some specific embodiments, the pipe 310 is connected to the top of the detection pipeline 200. At this time, the side of the battery pack 100 has enough height to place the pipe 310.

[0071] Specifically, the pressure detection unit 300 further includes a connecting pipe 330. The pipeline 310 is connected to the three-way joint 210 at the top through the connecting pipe 330. Accordingly, the bottom end of the three-way joint 210 at the bottom is blocked.

[0072] In other specific embodiments, the pipe 310 may also be connected to the bottom end of the detection pipeline 200, that is, directly connected to the three-way joint 210 at the bottom. Accordingly, the top end of the three-way joint 210 at the top is blocked. In this case, the battery pack 100 needs to be installed at a certain height to ensure that there is enough height on the side of the battery pack 100 to place the pipe 310.

[0073] Furthermore, in some specific implementations, a pressure balancing valve is provided on the detection pipeline 200 .

[0074] After connecting the pipeline 310 to the detection pipeline 200, first open the pressure balance valve, and then inject liquid into the second pipe section 313 through the opening of the second pipe section 313 to keep the pressure in the detection pipeline 200 consistent with the external environmental pressure. After the liquid injection is completed, close the pressure balance valve.

[0075] In other specific implementations, the pressure balance valve may not be provided on the detection pipeline 200, which makes the structure simpler and the cost lower. In this case, liquid needs to be injected into the second pipe section 313 first, and then the pipeline 310 is connected to the detection pipeline 200.

[0076] In another embodiment of the present application, the pressure detection unit 300 may also be a pressure sensor. The pressure sensor is disposed on the detection pipeline 200 to directly detect the pressure in the detection pipeline 200 .

[0077] See also Figure 4 In another embodiment of the present application, the pressure detection unit 300 may also be composed of a cylinder 340 , a piston 350 , an elastic member 360 and a sensing member 370 .

[0078] Specifically, the cylinder body 340 is connected to the detection pipeline 200 , the piston 350 is slidably disposed in the cylinder body 340 , and the piston 350 is connected to the inner wall of the cylinder body 340 through the elastic member 360 .

[0079] The piston 350 divides the inner cavity of the cylinder 340 into a first chamber 341 and a second chamber 342. The first chamber 341 is connected to the inner cavity of the detection pipeline 200, and the second chamber 342 is connected to the outside.

[0080] When the pressure in the detection pipeline 200 rises, the pressure in the first chamber 341 rises accordingly and becomes greater than the pressure in the second chamber 342. Under the action of the pressure difference, the piston 350 slides in the cylinder 340 in a direction away from the detection pipeline 200, thereby causing the elastic member 360 to deform until the elastic force applied by the elastic member 360 to the piston 350 reaches a balance with the pressure on the piston 350.

[0081] Accordingly, the sensing member 370 is disposed on the cylinder body 340 and senses the piston 350 when the piston 350 slides to a preset position.

[0082] In other words, when the piston 350 slides to the preset position, it indicates that the pressure in the detection pipeline 200 rises to a safety threshold. At this time, the sensing element 370 senses the piston 350 and gives an alarm signal.

[0083] It is understandable that the preset position can be one or more, and the number of the sensing members 370 is the same as the number of the preset positions. When there are more than one preset position, the multiple preset positions are arranged in sequence along the sliding direction of the piston 350 .

[0084] Exemplarily, there are three preset positions, namely a first preset position, a second preset position and a third preset position, and the first preset position, the second preset position and the third preset position are arranged in sequence in a direction away from the detection pipeline 200 .

[0085] When the piston 350 slides to the first preset position, it indicates that the pressure in the detection pipeline 200 rises to the first threshold. When the piston 350 slides to the second preset position, it indicates that the pressure in the detection pipeline 200 rises to the second threshold. When the piston 350 slides to the third preset position, it indicates that the pressure in the detection pipeline 200 rises to the third threshold. The second threshold is greater than the first threshold, and the third threshold is greater than the second threshold. Correspondingly, the sensor 370 gives different alarm signals.

[0086] In some specific implementations, the elastic member 360 is a tension spring, one end of which is fixedly connected to the piston 350 , and the other end of which is connected to the inner wall of the cylinder body 340 near one end of the detection pipeline 200 .

[0087] In some specific embodiments, the induction element 370 is a metal contact, and the metal contact is in contact with the piston 350 when the piston 350 slides to the preset position. At this time, the on-off state of the conductive circuit where the metal contact is located can be used to determine whether the piston 350 slides to the preset position.

[0088] Optionally, the metal contacts are provided in pairs on the cylinder body 340 and are arranged along the circumference of the cylinder body 340 .

[0089] In some other specific implementations, the sensing element 370 may also be a photoelectric switch, such as a beam-type photoelectric switch, an emission-type photoelectric switch, etc.

[0090] Furthermore, a pressure balance hole 343 is provided on the cylinder body 340 , and the pressure balance hole 343 is connected with the inner cavity of the cylinder body 340 close to one end of the detection pipeline 200 , that is, connected with the first chamber 341 when the piston 350 slides to a preset position.

[0091] In other words, when the pressure in the detection line 200 rises to a safety threshold, the inner cavity of the detection line 200 is connected to the outside through the first chamber 341 and the pressure balance hole 343 in sequence, so that the pressure can be released to prevent the battery pack 100 from bursting.

[0092] In some specific embodiments, the inner wall of the cylinder body 340 is further provided with a limiting portion 344 to limit the sliding stroke of the piston 350 , prevent the piston 350 from escaping from the cylinder body 340 , and prevent the elastic member 360 from generating irreversible deformation.

[0093] Furthermore, considering that the detection line 200 is connected to the pressure relief port, the explosion-proof structure originally provided at the pressure relief port is also replaced. In order to ensure that the battery pack 100 still has an explosion-proof function, an explosion-proof valve is provided on the detection line 200 .

[0094] When the pressure in the battery pack 100 and the detection pipeline 200 is too high, the explosion-proof valve can automatically open and release the pressure to prevent the battery pack 100 from bursting.

[0095] Optionally, the pressure sensor is arranged at the top end of the detection pipeline 200 , and the explosion-proof valve is arranged at the bottom end of the detection pipeline 200 .

[0096] In some specific implementations, the explosion-proof valve is a solenoid valve, and the solenoid valve is electrically connected to the pressure detection unit 300 .

[0097] When the pressure detection unit 300 adopts the design of the pipeline 310 and the liquid level sensor 320, the solenoid valve is electrically connected to the liquid level sensor 320. When in use, the liquid level change signal detected by the liquid level sensor 320 is also used as an opening signal of the solenoid valve to control the solenoid valve to automatically open and close.

[0098] When the pressure detection unit 300 uses a pressure sensor, the solenoid valve is electrically connected to the pressure sensor. When in use, the pressure information collected by the pressure sensor is also used as an opening signal of the solenoid valve to control the solenoid valve to automatically open and close.

[0099] When the pressure detection unit 300 is designed with a cylinder 340, a piston 350, an elastic member 360 and a sensing member 370, the electromagnetic valve is electrically connected to the conductive circuit where the sensing member 370 is located. When in use, the electromagnetic valve is automatically opened and closed according to the on-off state of the conductive circuit.

[0100] In summary, the energy storage battery cluster is connected to multiple battery packs 100 by setting up a detection pipeline 200. Only one pressure detection unit is needed to detect the pressure in the detection pipeline 200, so as to monitor the status of multiple battery packs 100, which is more cost-effective. Compared with the existing design that only relies on the temperature probe of the BMS in the battery pack 100 as the fire start-up solution for the entire cluster, the pressure detection unit 300 can be used in conjunction with the temperature probe of the BMS in the battery pack 100, which is more reliable. The pressure detection unit 300 is set outside the battery pack 100, which is convenient for maintenance and replacement, reducing the difficulty of after-sales.

[0101] In addition, compared with conventional smoke and temperature sensors or composite detectors, the liquid level sensor 320 or pressure sensor used in the above energy storage battery cluster is a mature product with lower cost and higher stability, which can also improve the reliability of the system.

[0102] This embodiment also provides an energy storage system, such as an energy storage power station, a household energy storage device, etc. The energy storage system includes a fire protection module and the above-mentioned energy storage battery cluster.

[0103] The pressure detection unit 300 is electrically connected to the fire protection module.

[0104] When the pressure detection unit 300 detects that the pressure in the detection pipeline 200 reaches a preset value, it indicates that at least one battery pack 100 is in a thermal runaway state. At this time, the fire fighting module starts the whole cluster fire fighting to reduce the risk.

[0105] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0106] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0107] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An energy storage battery cluster, characterized in that: include: Multiple battery packs; Detection pipelines, respectively connected to the plurality of battery packs; as well as A pressure detection unit, connected to the detection pipeline and used to detect the pressure in the detection pipeline; The battery pack has a pressure relief port, and the detection pipeline is connected to the pressure relief ports of a plurality of the battery packs respectively.

2. The energy storage battery cluster according to claim 1, characterized in that: The pressure detection unit includes a pipeline and a liquid level sensor; The pipeline includes a first pipe section connected to the detection pipeline and a second pipe section connected to the outside, the first pipe section and the second pipe section both extend downward and are connected through a bend, and there is liquid in the pipeline, and the liquid level is higher than the top pipe wall at the lowest point of the bend; The liquid level sensor is disposed close to the bending portion and is used to detect whether the liquid level is higher or lower than the liquid level sensor.

3. The energy storage battery cluster according to claim 2, characterized in that: A liquid level scale is provided on the first pipe section or the second pipe section.

4. The energy storage battery cluster according to claim 2, characterized in that: A plurality of the battery packs are stacked, the detection pipeline is vertically arranged, and the top end of the detection pipeline is connected to the pipeline.

5. The energy storage battery cluster according to claim 2, characterized in that: A pressure balancing valve is arranged on the detection pipeline.

6. The energy storage battery cluster according to claim 1, characterized in that: The pressure detection unit includes a pressure sensor, and the pressure sensor is arranged in the detection pipeline.

7. The energy storage battery cluster according to claim 1, characterized in that: The pressure detection unit includes a cylinder, a piston, an elastic member and a sensing member; The cylinder is connected to the detection pipeline, the piston is slidably disposed in the cylinder, and the piston is connected to the inner wall of the cylinder through the elastic member; The sensing element is disposed on the cylinder body and senses the piston when the piston slides to a preset position.

8. The energy storage battery cluster according to claim 7, characterized in that: The cylinder body is provided with a pressure balance hole, and the pressure balance hole is communicated with the inner cavity of the cylinder body close to one end of the detection pipeline when the piston slides to the preset position.

9. The energy storage battery cluster according to claim 7, characterized in that: The induction element is a metal contact, and the metal contact is in contact with the piston and is connected when the piston slides to the preset position.

10. The energy storage battery cluster according to any one of claims 1 to 9, characterized in that: An explosion-proof valve is arranged on the detection pipeline.

11. The energy storage battery cluster according to claim 10, characterized in that: The explosion-proof valve is a solenoid valve, and the solenoid valve is electrically connected to the pressure detection unit.

12. An energy storage system, characterized in that: It comprises a fire-fighting module and the energy storage battery cluster according to any one of claims 1 to 11, wherein the pressure detection unit is electrically connected to the fire-fighting module.

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