PACK-level fire extinguishing methods and fire fighting systems

Abstract

The present invention discloses a PACK-level fire extinguishing method and fire fighting system, wherein the method comprises: after receiving a PACK-level fire fighting start signal, starting the first PACK-level fire fighting, controlling each electromagnetic valve on the fire fighting pipeline path from the fire fighting container to the abnormal temperature battery pack to open for a preset first time length; monitoring whether the fire detection tube in the abnormal temperature battery pack is damaged, and when it is detected that the fire detection tube is damaged after the first PACK-level fire fighting is started, starting the second PACK-level fire fighting, controlling each electromagnetic valve on the fire fighting pipeline path from the fire fighting container to the abnormal temperature battery pack to open for a preset second time length. By adopting the present invention, when an abnormality occurs in a battery cell, thermal runaway and heat spread of the battery cell can be accurately and timely suppressed, reducing the risk of the energy storage system in use.

Description

Technical Field

[0001] The present invention relates to the technical field of battery fire extinguishing, and in particular to a PACK-level fire extinguishing method and a fire fighting system. Background Art

[0002] With the rapid development of electrochemical energy storage technology, energy storage products have been widely used at home and abroad. Lithium iron phosphate batteries have become the mainstream batteries in energy storage due to their high energy density, long cycle life, and low raw material cost. However, they also bring hidden dangers. Once the battery has thermal runaway due to overcharging, overheating or puncture, it will release a large amount of flammable gas. Without reasonable countermeasures, it will quickly cause fire or even explosion, causing immeasurable loss of life and property.

[0003] In the existing PACK (i.e. battery pack) level fire protection scheme, composite sensors are generally used in conjunction with puncture valves for detection and fire extinguishing. Composite sensors are prone to false alarms when detecting gases in battery packs for a long time, and puncture valves can only spray in a small range, with obstructions, and cannot accurately extinguish the thermal runaway battery cells. There are also other fire protection schemes that connect the fire bottle group to the inside of the PCAK through a fire protection pipe, and lay a fire detection pipe above the battery cells in the PACK, so that directional fire extinguishing can be achieved. However, if the fire detection pipe is still not damaged after the start time of the fire bottle group, this fire protection scheme can only spray the fire extinguishing agent in the fire detection pipe when the fire detection pipe is damaged (the fire extinguishing agent in the fire bottle group cannot be continuously sprayed due to the end of the start time of the solenoid valve), and cannot effectively suppress thermal runaway. If the solenoid valve is continuously started or periodically started, although it can continue to spray after the fire detection pipe is damaged, due to the uncertain time of the fire detection pipe damage (it may last for a long time, or it may not be damaged), the solenoid valve may be energized for a long time after the fire is started. In an environment where flammable gas is abnormally released due to battery cells, there is a risk of explosion when a solenoid valve that is energized for a long time ignites. Summary of the invention

[0004] The embodiments of the present invention aim to provide a PACK-level fire extinguishing method and a fire fighting system to solve the problem in the prior art that the PACK-level fire fighting solution cannot accurately extinguish fires or cannot effectively suppress thermal runaway.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] According to one aspect of the present invention, a PACK level fire extinguishing method is provided, the method comprising:

[0007] After receiving the PACK-level fire start signal, the first PACK-level fire extinguishing is started, and each solenoid valve on the fire pipe path from the fire extinguishing container to the battery pack with abnormal temperature is controlled to open for a preset first time length;

[0008] Monitor whether the fire detection tube in the temperature-abnormal battery pack is damaged. When it is detected that the fire detection tube is damaged after the first PACK-level fire extinguishing is initiated, initiate the second PACK-level fire extinguishing, and control each solenoid valve on the fire protection pipe path from the fire extinguishing container to the temperature-abnormal battery pack to open for a preset second time length.

[0009] Optionally, monitoring whether the fire detection tube in the battery pack with abnormal temperature is damaged includes:

[0010] Acquiring a pressure signal collected in the fire-fighting pipeline or the fire-detecting pipe;

[0011] The pressure signal is monitored, and when it is detected that the pressure signal first has a rising edge and then a falling edge, it is determined that the fire detection tube is damaged after the first PACK level fire extinguishing is started.

[0012] Optionally, monitoring whether the fire detection tube in the battery pack with abnormal temperature is damaged includes:

[0013] Acquiring a temperature signal collected in the fire detection tube;

[0014] The temperature signal is monitored, and when it is detected that the temperature signal rises to a preset temperature threshold, it is determined that the fire detection tube is damaged after the first PACK-level fire extinguishing is started.

[0015] Optionally, the PACK-level fire start signal is triggered based on the temperature detection information of each battery cell in the temperature-abnormal battery pack and the environment detection information in the temperature-abnormal battery pack meeting a preset alarm condition.

[0016] Optionally, when it is monitored that the fire detection tube has been damaged before the first PACK-level fire extinguishing is initiated, the first time duration is reset to extend to a preset third time duration.

[0017] According to another aspect of the present invention, a PACK-level fire fighting system is provided, the fire fighting system comprising a fire extinguishing container, at least one solenoid valve, a fire fighting pipeline, a fire detection pipe and a fire fighting control module.

[0018] The fire extinguishing container is connected to the battery pack through the at least one solenoid valve and the fire fighting pipe, and the fire detection pipe is arranged inside the battery pack and communicated with the fire fighting pipe through the interface component of the battery pack;

[0019] The fire control module is used to execute the above-mentioned PACK level fire extinguishing method.

[0020] Optionally, the fire protection system further comprises a signal feedback device, wherein the signal feedback device is used to obtain a detection signal for monitoring whether the fire detection tube is damaged, and feed back the detection signal to the fire protection control module.

[0021] Optionally, the signal feedback device is a pressure sensor disposed in the fire-fighting pipe or the fire-detecting pipe, or a temperature sensor disposed in the fire-detecting pipe.

[0022] Optionally, the fire detection tube is disposed above the pressure relief valve of each battery cell in the battery pack and is arranged around the gaps between the battery cells in the battery pack.

[0023] Optionally, the fire protection system also includes an energy storage control module, which is used to obtain temperature detection information of each battery cell in the battery pack and environmental detection information in the battery pack, and when the temperature detection information and the environmental detection information meet preset alarm conditions, a PACK-level fire protection start signal is sent to the fire protection control module.

[0024] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, in the embodiments of the present invention, a PACK-level fire extinguishing method is provided. After receiving the PACK-level fire start signal, the first PACK-level fire extinguishing is started, and each solenoid valve on the fire-fighting pipeline path from the fire-extinguishing container to the battery pack with abnormal temperature is controlled to open for a preset first time length; whether the fire-detecting tube in the battery pack with abnormal temperature is damaged is monitored, and when it is detected that the fire-detecting tube is damaged after the first PACK-level fire extinguishing is started, the second PACK-level fire extinguishing is started, and each solenoid valve on the fire-fighting pipeline path from the fire-extinguishing container to the battery pack with abnormal temperature is controlled to open for a preset second time length. By adopting the present invention, when an abnormality occurs in a battery cell, thermal runaway and heat spread of the battery cell can be accurately and timely suppressed, reducing the risk of the energy storage system in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Devices with the same reference numerals in the drawings represent similar devices, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0026] Figure 1 It is a structural schematic diagram of a PACK-level fire protection system provided by an embodiment of the present invention;

[0027] Figure 2 It is a module schematic diagram of a PACK-level fire protection system provided by an embodiment of the present invention;

[0028] Figure 3 It is a flow chart of a PACK-level fire extinguishing method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] According to an embodiment of the present invention, a PACK-level fire protection system is provided. Figure 1 , which is a schematic diagram of the structure of a PACK-level fire protection system provided by an embodiment of the present invention. The fire protection system includes a fire extinguishing container 11, a bottle group solenoid valve 12, a fire protection pipeline 13, a fire detection tube 14, a signal feedback device 15, a fire protection control module 16, an energy storage control module 17, a combustible gas sensor 18, etc.

[0032] The fire extinguishing container 11 is filled with a fire extinguishing agent. In one example, the fire extinguishing container 11 is a fire-fighting gas cylinder, and the fire extinguishing agent is perfluorohexanone. Perfluorohexanone is a colorless, odorless, transparent liquid at room temperature and is easily vaporized. The fire extinguishing container 11 is connected to the interface component 22 of the battery pack 20 via the bottle group solenoid valve 12 and the fire-fighting pipe 13.

[0033] In one embodiment, when there are a large number of battery packs, in order to save fire extinguishing agent and improve fire extinguishing efficiency, multiple battery packs can be controlled in different areas. Figure 2 , multiple battery packs are divided into 10 clusters, and each cluster may contain multiple battery packs. Among them, the 1st to 5th cluster battery packs correspond to the 1st to 5th cluster partition solenoid valves and the 1st to 5th cluster signal feedback devices. The 6th to 10th cluster battery packs correspond to the 6th to 10th cluster partition solenoid valves and the 6th to 10th cluster signal feedback devices. In this embodiment, the fire protection pipeline 13 may include a first delivery pipeline and a second delivery pipeline. The fire extinguishing container 11 is connected to the first delivery pipeline via the bottle group solenoid valve 12, and the first delivery pipeline is then connected to the second delivery pipeline of each partition through the partition solenoid valve, and the second delivery pipeline of each partition is then connected to the battery pack 20 of each partition. Among them, the signal feedback device can be arranged in the second delivery pipeline of each partition.

[0034] The fire detection tube 14 is a temperature-sensitive tube that can automatically explode under the influence of high temperature. The fire detection tube 14 is arranged inside the battery pack 20 and is connected to the fire protection pipe 13 through the interface component 22 of the battery pack 20. In order to achieve precise fire extinguishing, the fire detection tube 14 is arranged above the pressure relief valve of each battery cell 21 in the battery pack 20 and is arranged around the gap between each battery cell 21 in the battery pack 20. One end of the fire detection tube 14 is connected to the fire protection pipe 13 through the interface component 22 of the battery pack 20, and the other end is closed.

[0035] The fire control module 16 is a core component in the fire protection system, and is used to control and execute various fire extinguishing measures. Specifically, the fire control module 16 is used to start the first PACK-level fire extinguishing after receiving the PACK-level fire start signal, and control each solenoid valve on the fire protection pipeline path from the fire extinguishing container 11 to the temperature abnormal battery pack 20 to open for a preset first time length, so that the fire extinguishing agent in the fire extinguishing container 11 enters the fire detection tube 14 in the temperature abnormal battery pack 20. For example, when Figure 2 When an abnormality in a battery cell in a battery pack of the second cluster triggers a PACK-level fire start signal, the fire control module 16 controls the bottle group solenoid valve and the 1-5 cluster partition solenoid valves to open for a preset first time period.

[0036] Among them, the PACK-level fire start signal is triggered based on the temperature detection information of each battery cell 21 in the battery pack 20 and the environmental detection information in the battery pack 20 meeting the preset alarm conditions. Specifically, the energy storage control module 17 is used to obtain the temperature detection information of each battery cell 21 in the battery pack 20 and the environmental detection information in the battery pack 20, and when the temperature detection information and the environmental detection information meet the preset alarm conditions, a PACK-level fire start signal is sent to the fire control module 16. Among them, the temperature detection information includes the battery cell temperature and the battery cell temperature rise rate. The environmental monitoring information includes the combustible gas concentration in the battery pack. The combustible gas concentration can be collected by the combustible gas sensor 18 arranged in the battery pack 20.

[0037] In one embodiment, when any two of the cell temperature, cell temperature rise rate, and combustible gas concentration reach a preset threshold, it is determined that the temperature detection information and environmental detection information of the battery pack 20 meet the preset alarm conditions. In order to timely suppress thermal runaway of the cell, the energy storage control module 17 is also used to issue instructions such as power-off and liquid cooling unit rapid cooling mode after determining that the temperature detection information and environmental detection information of the battery pack 20 meet the preset alarm conditions. After receiving the PACK-level fire start signal, the fire control module 16 is also used to control the lighting of the deflation indicator light and the activation of the sound and light alarm.

[0038] The fire control module 16 is also used to monitor whether the fire detection tube 14 in the temperature-abnormal battery pack is damaged. When it is detected that the fire detection tube 14 is damaged after the first PACK-level fire extinguishing is started, the second PACK-level fire extinguishing is started to control each solenoid valve on the fire protection pipeline path from the fire extinguishing container 11 to the temperature-abnormal battery pack 20 to open for a preset second time period, so that the fire extinguishing agent in the fire extinguishing container 11 can be sprayed from the damaged part of the fire detection tube 14 to extinguish the fire.

[0039] The signal feedback device 15 is used to obtain a detection signal (such as a pressure signal or a temperature signal) for monitoring whether the fire detection tube 14 is damaged, and feed back the detection signal to the fire control module 16. In one embodiment, the signal feedback device 15 may be a pressure sensor arranged in the fire pipe 13 or the fire detection tube 14, or a temperature sensor arranged in the fire detection tube 14. When the fire protection system includes a partition solenoid valve, a signal feedback device 15 of the pressure sensor type may be arranged in the fire pipe 13 of each partition. It should be pointed out that the signal feedback device 15 can directly feed back the detection signal to the fire control module 16, or feed back the detection signal to the fire control module 16 through the energy storage control module 17.

[0040] In one embodiment, when the detection signal is a pressure signal collected by the signal feedback device 15 in the fire protection pipe 13 or the fire detection pipe 14, the fire control module 16 monitors the pressure signal, and when it is detected that the pressure signal first has a rising edge and then a falling edge, it is determined that the fire detection pipe 14 is damaged after the first PACK level fire extinguishing is started. This is because, when the first PACK level fire extinguishing is started, if the fire detection pipe 14 is not damaged, the system from the fire extinguishing container 11 to the end of the fire detection pipe 14 is a closed system. When the bottle group solenoid valve and the corresponding partition solenoid valve (if any) are opened, the fire extinguishing agent is filled into the fire detection pipe 14. At this time, the pressure in the pipeline rises, and the signal feedback device 15 feeds back the rising edge pressure signal to the fire control module 16. When the pressurized fire detection tube 14 is damaged due to the high-temperature smoke released by the opening of the valve of the battery cell 21, part of the fire extinguishing agent is sprayed under pressure directly above the battery cell of the battery pack 20 with abnormal temperature, the pressure inside the pipe drops, and the signal feedback device 15 feeds back the falling edge pressure signal to the fire control module 16.

[0041] When the first PACK-level fire extinguishing is started, if the fire detection tube 14 has been damaged, there will be no obvious change in the pressure in the tube after the first PACK-level fire extinguishing is started, and the fire control module 16 cannot detect the rising edge pressure signal or the falling edge pressure signal. In order to ensure that the thermal runaway of the battery cell is effectively suppressed, the first time length can be reset to extend it to the preset third time length.

[0042] Since the time required for the fire detection tube to break is uncertain, there may be a long plateau period between the rising edge signal and the falling edge signal. After the rising edge of the pressure signal is detected, if the falling edge signal is not detected within the preset time threshold, it means that the thermal runaway in the battery pack may have been suppressed or the sensor has a false alarm, and the fire protection system can issue a prompt for manual intervention.

[0043] In other embodiments, when the detection signal is a temperature signal collected by the signal feedback device 15 in the fire detection tube 14, the fire control module 16 monitors the temperature signal, and when it is detected that the temperature signal rises to a preset temperature threshold, it is determined that the fire detection tube 14 is damaged after the first PACK level fire extinguishing is started. Wherein, the temperature threshold can be determined according to the bursting temperature of the fire detection tube 14. If the temperature signal is within the preset time threshold range and has not reached the preset temperature threshold, it means that the thermal runaway in the battery pack may have been suppressed or the sensor has a false alarm, and the fire protection system may issue a prompt for manual intervention. If the temperature signal obtained for the first time after the first PACK level fire extinguishing is started has reached the preset temperature threshold, it means that the fire detection tube 14 has been damaged before the first PACK level fire extinguishing is started. In order to ensure that the thermal runaway of the battery cell is effectively suppressed, the first time duration can be reset to extend it to the preset third time duration.

[0044] In an embodiment of the present invention, the fire extinguishing agent can be filled into the fire detection tube through the first PACK level fire extinguishing, and the first duration can be determined according to the flow rate of the fire extinguishing agent and the volume of the pipe that needs to pass from the fire extinguishing container to the fire detection tube of the farthest battery pack with abnormal temperature. The thermal runaway of the battery cell can be effectively suppressed by the second PACK level fire extinguishing. The second duration can be calculated according to the volume of the battery pack with abnormal temperature, and then the size of the second duration can be determined according to the required capacity of the fire extinguishing agent and the flow rate of the fire extinguishing agent. When the fire detection tube is damaged before the first PACK fire extinguishing is started, the thermal runaway of the abnormal battery cell can be effectively suppressed by extending the first duration to the third duration. Generally, the third duration is greater than the first duration or the second duration, and less than or equal to the first duration plus the second duration.

[0045] In the fire protection system provided by the embodiment of the present invention, if the fire detection tube in the battery pack with abnormal temperature is damaged after the first PACK-level fire extinguishing is started, the fire protection system will start the PACK-level fire extinguishing twice in total; if the fire detection tube in the battery pack with abnormal temperature is damaged before the first PACK-level fire extinguishing is started, the fire protection system only needs to start the PACK-level fire extinguishing once in total, and when the fire protection system determines that the fire detection tube has been damaged before the first PACK-level fire extinguishing is started, the duration of the first PACK-level fire extinguishing is extended to effectively suppress the thermal runaway of the abnormal battery cell. Compared with the prior art, the scheme of the present invention can realize the second PACK-level fire extinguishing or the extension of the duration of the first PACK-level fire extinguishing as soon as possible when the fire detection tube is damaged, effectively suppress the thermal runaway of the abnormal battery cell at a fixed time and point, and avoid the safety hazards caused by the long-term power supply of the solenoid valve.

[0046] The embodiment of the present invention also provides a PACK-level fire extinguishing method. Figure 3 , is a flow chart of a PACK-level fire extinguishing method provided in an embodiment of the present invention, the method is applied to a fire fighting system with a fire detection tube in a battery pack, such as the fire fighting system described in the above embodiment. Specifically, it includes the following steps:

[0047] Step S301, after receiving the PACK-level fire start signal, start the first PACK-level fire extinguishing, and control each solenoid valve on the fire pipe path from the fire extinguishing container to the battery pack with abnormal temperature to open for a preset first time length.

[0048] In one embodiment, the PACK-level fire start signal is triggered based on the temperature detection information of each battery cell in the temperature abnormal battery pack and the environmental detection information in the temperature abnormal battery pack meeting the preset alarm conditions. Specifically, the fire protection system obtains the temperature detection information of each battery cell in the battery pack and the environmental detection information in the battery pack, and when the temperature detection information and the environmental detection information meet the preset alarm conditions, the PACK-level fire start signal is triggered. Among them, the temperature detection information includes the battery cell temperature and the battery cell temperature rise rate. The environmental monitoring information includes the concentration of combustible gas in the battery pack.

[0049] In one embodiment, when any two of the cell temperature, cell temperature rise rate, and combustible gas concentration reach a preset threshold, it is determined that the temperature detection information and environmental detection information of the battery pack meet the preset alarm conditions. In order to timely suppress thermal runaway of the cell, after determining that the temperature detection information and environmental detection information of the battery pack meet the preset alarm conditions, it is also used to issue instructions such as power-off and liquid cooling unit to start the rapid cooling mode. After the fire protection system triggers the PACK-level fire protection start signal, the control deflation indicator light is turned on and the sound and light alarm is started.

[0050] In the embodiment of the present invention, the main purpose of the first PACK-level fire extinguishing is to fill the fire extinguishing agent into the fire detection tube. Therefore, the first duration can be determined according to the flow rate of the fire extinguishing agent and the volume of the pipe that needs to be passed from the fire extinguishing container to the fire detection tube of the battery pack with abnormal temperature at the farthest end.

[0051] Step S302, monitor whether the fire detection tube in the temperature-abnormal battery pack is damaged. When it is detected that the fire detection tube is damaged after the first PACK-level fire extinguishing is initiated, the second PACK-level fire extinguishing is initiated to control each solenoid valve on the fire protection pipe path from the fire extinguishing container to the temperature-abnormal battery pack to open for a preset second time length.

[0052] The method of monitoring whether the fire detection tube in the battery pack with abnormal temperature is damaged varies according to the different detection signals obtained. In one embodiment, the detection signal obtained is a pressure signal collected in the fire protection pipe or the fire detection pipe. Before the PACK-level fire extinguishing is started, the fire extinguishing pipe of the fire protection system is not filled with fire extinguishing agent, and its internal pressure is close to the external air pressure. After the first PACK-level fire extinguishing is started, if the fire detection tube is not damaged, the system from the fire extinguishing container to the end of the fire detection tube is a closed system. When the bottle group solenoid valve and the corresponding partition solenoid valve (if any) are opened, the fire extinguishing agent is filled into the fire detection tube, and the pressure in the pipe rises. When the pressurized fire detection tube is damaged due to the high-temperature smoke released by the opening of the battery cell valve, part of the fire extinguishing agent is sprayed under pressure directly above the battery cell of the battery pack with abnormal temperature, and the pressure inside the pipe drops. Therefore, monitoring whether the fire detection tube in the battery pack with abnormal temperature is damaged includes: obtaining a pressure signal collected in the fire protection pipe or the fire detection tube; monitoring the pressure signal, and when it is monitored that the pressure signal first has a rising edge and then a falling edge, it is determined that the fire detection tube is damaged after the first PACK-level fire extinguishing is initiated.

[0053] In other embodiments, the acquired detection signal is a temperature signal collected in the fire detection tube. The fire detection tube is a temperature-sensitive tube that can automatically explode under the influence of high temperature. Before the PACK-level fire extinguishing is started, the temperature signal in the fire detection tube rises with the temperature of the abnormal battery cell. When the first PACK-level fire extinguishing is started, if the fire detection tube is not damaged, as time goes by, the temperature of the abnormal battery cell rises sharply, and the valve is opened to release high-temperature smoke, so that the temperature of the fire detection light rises to a preset temperature threshold and is damaged. Therefore, monitoring whether the fire detection tube in the temperature abnormal battery pack is damaged includes: acquiring the temperature signal collected in the fire detection tube; monitoring the temperature signal, and when it is monitored that the temperature signal rises to a preset temperature threshold, it is judged that the fire detection tube is damaged after the first PACK-level fire extinguishing is started. Among them, the temperature threshold can be determined according to the explosion temperature of the fire detection tube. If the temperature signal is within the preset time threshold range and has not reached the preset temperature threshold, it means that the thermal runaway in the battery pack may have been suppressed or the sensor has a false alarm, and the fire protection system can issue a prompt for manual intervention. If the temperature signal obtained for the first time after the first PACK-level fire extinguishing is initiated has reached the preset temperature threshold, it means that the fire detection tube has been damaged before the first PACK-level fire extinguishing is initiated. In order to ensure that the abnormal battery cell thermal runaway is effectively suppressed, the first duration can be reset to extend it to the preset third duration.

[0054] In an embodiment of the present invention, thermal runaway of the battery cell can be effectively suppressed by a second PACK-level fire extinguishing. The second duration corresponding to the second PACK-level fire extinguishing can be used to calculate the capacity of the required fire extinguishing agent based on the volume of the battery pack with abnormal temperature, and then the size of the second duration is determined based on the required capacity of the fire extinguishing agent and the flow rate of the fire extinguishing agent. When the fire detection tube is damaged before the first PACK fire extinguishing is started, the abnormal thermal runaway of the battery cell can be effectively suppressed by extending the first duration to the third duration. Generally, the third duration is greater than the first duration or the second duration, and less than or equal to the first duration plus the second duration.

[0055] The PACK-level fire extinguishing solution provided by the embodiment of the present invention can effectively suppress the thermal runaway of abnormal cells at a fixed time and at a fixed point by monitoring the damage time of the fire detection tube in the temperature abnormal battery pack. Since the solution of the present invention opens the solenoid valve only when the damage time of the fire detection tube is detected, it also avoids the safety hazard caused by the long-term power supply of the solenoid valve.

[0056] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution, in essence or in other words, the part that contributes to the relevant technology, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0057] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. Therefore, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A PACK-level fire extinguishing method, characterized in that: Applied to a PACK-level fire protection system, the fire protection system includes a fire extinguishing container, at least one solenoid valve, a fire protection pipeline, a fire detection pipe and a fire protection control module, the fire extinguishing container is connected to a battery pack through the at least one solenoid valve and the fire protection pipeline, the fire detection pipe is arranged inside the battery pack and communicated with the fire protection pipeline through an interface component of the battery pack, and the method includes: After receiving the PACK-level fire start signal, the first PACK-level fire extinguishing is started, and each solenoid valve on the fire pipe path from the fire extinguishing container to the battery pack with abnormal temperature is controlled to open for a preset first time length; Monitor whether the fire detection tube in the abnormal temperature battery pack is damaged. When it is detected that the fire detection tube is damaged after the first PACK-level fire extinguishing is started, start the second PACK-level fire extinguishing, and control each solenoid valve on the fire protection pipeline path from the fire extinguishing container to the abnormal temperature battery pack to open for a preset second time length; When it is detected that the fire detection tube has been damaged before the first PACK level fire extinguishing is started, the first time duration is reset to extend it to a preset third time duration.

2. The method according to claim 1, characterized in that The monitoring of whether the fire detection tube in the abnormal temperature battery pack is damaged includes: Acquiring a pressure signal collected in the fire-fighting pipeline or the fire-detecting pipe; The pressure signal is monitored, and when it is detected that the pressure signal first has a rising edge and then a falling edge, it is determined that the fire detection tube is damaged after the first PACK level fire extinguishing is started.

3. The method according to claim 1, characterized in that The monitoring of whether the fire detection tube in the abnormal temperature battery pack is damaged includes: Acquiring a temperature signal collected in the fire detection tube; The temperature signal is monitored, and when it is detected that the temperature signal rises to a preset temperature threshold, it is determined that the fire detection tube is damaged after the first PACK-level fire extinguishing is started.

4. The method according to claim 1, characterized in that: The PACK-level fire start signal is triggered based on the temperature detection information of each battery cell in the temperature-abnormal battery pack and the environment detection information in the temperature-abnormal battery pack meeting the preset alarm conditions.

5. A PACK-level fire protection system, characterized in that: The fire fighting system includes a fire extinguishing container, at least one solenoid valve, a fire fighting pipeline, a fire detection pipe and a fire fighting control module. The fire extinguishing container is connected to the battery pack through the at least one solenoid valve and the fire fighting pipe, and the fire detection pipe is arranged inside the battery pack and communicated with the fire fighting pipe through the interface component of the battery pack; The fire control module is used to execute the PACK-level fire extinguishing method according to any one of claims 1 to 4.

6. The fire fighting system according to claim 5, characterized in that: The fire protection system also includes a signal feedback device, which is used to obtain a detection signal for monitoring whether the fire detection tube is damaged, and feed back the detection signal to the fire protection control module.

7. The fire fighting system according to claim 6, characterized in that: The signal feedback device is a pressure sensor arranged in the fire-fighting pipeline or the fire-detecting pipe, or a temperature sensor arranged in the fire-detecting pipe.

8. The fire fighting system according to any one of claims 5 to 7, characterized in that: The fire detection tube is arranged above the pressure relief valve of each battery cell in the battery pack and is arranged around the gaps between the battery cells in the battery pack.

9. The fire fighting system according to any one of claims 5 to 7, characterized in that: The fire protection system also includes an energy storage control module, which is used to obtain temperature detection information of each battery cell in the battery pack and environmental detection information in the battery pack. When the temperature detection information and the environmental detection information meet preset alarm conditions, a PACK-level fire protection start signal is sent to the fire protection control module.

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