Fire suppression device for lithium battery pack

Abstract

The utility model relates to a fire suppression device for a lithium battery pack. The fire suppression device comprises a fire extinguishing agent container, a fire extinguishing agent supply pipe assembly, a detector and a trigger release assembly, the fire extinguishing agent container is arranged outside the lithium battery pack, and a fire extinguishing agent is contained in the fire extinguishing agent container; a suction port of the fire extinguishing agent supply pipe assembly extends into the fire extinguishing agent container, and a part of the fire extinguishing agent supply pipe assembly is arranged in the lithium battery pack; the detector is mounted in the lithium battery pack and is configured to detect a fire generation signal in the lithium battery pack; and the trigger release assembly is configured to enable the fire extinguishing agent container to supply a fire extinguishing agent into the lithium battery pack through the fire extinguishing agent supply pipe assembly after the detector detects a fire occurrence signal. According to the invention, the fire development of the lithium battery pack is effectively inhibited.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lithium battery pack fire suppression, and particularly relates to a lithium battery pack fire suppression device. BACKGROUND

[0002] Lithium batteries in the new energy industry are prone to fire, and after the lithium battery catches fire, it can burn by itself without the help of oxygen. After the battery thermal runaway, the fire develops very quickly. Since the lithium battery pack is relatively closed, if it is put out from the outside after a fire occurs, the extinguishing agent cannot effectively target the burning battery cell and cannot effectively control the fire. The existing automatic fire extinguishing solutions for lithium battery packs mainly have the following two kinds:

[0003] One is to place a disposable fire extinguishing device inside the battery pack. After a fire occurs, the fire extinguishing device releases the extinguishing agent once to extinguish the fire. However, due to the limited space inside the battery pack, only a certain amount of extinguishing agent can be arranged. If the fire cannot be effectively suppressed at one time, the subsequent fire will continue to burn.

[0004] Another solution is to install an extinguishing agent nozzle on the battery pack and connect it to a self-pressurized extinguishing agent tank through a pipeline. When the fire detector inside the lithium battery pack detects a fire signal, the valve is opened to release the extinguishing agent into the lithium battery pack to extinguish the fire. However, this solution requires pre-arrangement of detectors, release pipelines, and control solenoid valves, and the extinguishing agent tank must always maintain a certain pressure to ensure that the extinguishing agent can be effectively released when needed. This solution requires complex detectors, controllers, pipelines, and control valves, and the extinguishing agent tank must maintain sufficient pressure for a long time. The pressure of the extinguishing agent tank may decrease over time, and regular checks are needed to ensure that the pressure of the extinguishing device is normal and to supplement the pressure. The maintenance is relatively complex. CONTENT OF THE UTILITY MODEL

[0005] In view of the above analysis, the embodiments of the present utility model aim to provide a lithium battery pack fire suppression device to solve one or more of the above problems in the prior art.

[0006] The purpose of the present utility model is achieved as follows:

[0007] A lithium battery pack fire suppression device, comprising:

[0008] An extinguishing agent container arranged outside the lithium battery pack, the extinguishing agent container containing extinguishing agent;

[0009] An extinguishing agent supply pipe assembly, the suction port of the extinguishing agent supply pipe assembly extending into the interior of the extinguishing agent container, and a portion of the extinguishing agent supply pipe assembly being arranged inside the lithium battery pack;

[0010] A detector installed inside the lithium battery pack and configured to detect a fire occurrence signal in the lithium battery pack;

[0011] The trigger release assembly is configured to cause the fire extinguishing agent container to supply fire extinguishing agent to the interior of the lithium battery pack through the fire extinguishing agent supply pipe assembly after the detector detects a fire occurrence signal.

[0012] Further, the top of the fire extinguishing agent container is provided with a first mounting port and a second mounting port, the fire extinguishing agent supply pipe assembly is sealingly mounted through the first mounting port, and the trigger release assembly is sealingly mounted in the second mounting port.

[0013] Further, the trigger release assembly includes a pressure generator and a striker assembly, the striker assembly is mounted in the second mounting port and connected to the detector through a wire, the pressure generator is arranged in the fire extinguishing agent container below the striker assembly, the pressure generator is provided with a diaphragm at the top, and the pressure generator contains liquid carbon dioxide; the striker assembly is configured to release liquid carbon dioxide into the fire extinguishing agent container by piercing the diaphragm of the pressure generator after receiving the fire occurrence signal detected by the detector.

[0014] Further, the fire extinguishing agent supply pipe assembly includes a siphon pipe and a flexible fire extinguishing agent release pipe, the siphon pipe is mounted in the first mounting port, the suction port of the siphon pipe is located at the bottom of the fire extinguishing agent container, the siphon pipe is connected to the flexible fire extinguishing agent release pipe, and the flexible fire extinguishing agent release pipe is arranged in the interior of the lithium battery pack.

[0015] Further, the flexible fire extinguishing agent release pipe is arranged in the form of a curve, a polyline, or a combination of both in the interior of the lithium battery pack.

[0016] Further, the flexible fire extinguishing agent release pipe is arranged in the form of a curve, a polyline, or a combination of both in the interior of the lithium battery pack.

[0017] Further, the outlet of the siphon pipe is connected to the flexible fire extinguishing agent release pipe through an adapter pipe, and the adapter pipe is connected to the flexible fire extinguishing agent release pipe through a conversion joint.

[0018] Further, the lithium battery pack is also provided with a pressure sensor, and the pressure sensor is mounted at the end of the flexible fire extinguishing agent release pipe.

[0019] Further, the striker assembly includes gunpowder, a piercing needle, and a shell, the gunpowder and the piercing needle are mounted in the shell, the lower side wall of the shell is provided with a pressure release port, and the pressure release port is located in the fire extinguishing agent container.

[0020] Further, the flexible fire extinguishing agent release pipe is a high-pressure nylon pipe.

[0021] Compared with the prior art, the lithium battery pack fire suppression device only needs to arrange the flexible fire extinguishing agent release pipe in the lithium battery pack, when the detector detects smoke and combustible gas anomaly, the flexible fire extinguishing agent release pipe is filled with pressure instantaneously, when the fire temperature in the battery pack continues to rise, the flexible fire extinguishing agent release pipe is softened and broken, and the fire extinguishing agent is sprayed to extinguish the fire and suppress the development of the fire. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0023] Fig. 1 The structure schematic view of the lithium battery pack fire suppression device provided by the present application is shown in the figure.

[0024] Fig. 2 The structure schematic view of the striker assembly and the pressure generator provided by the present application is shown in the figure.

[0025] Reference signs:

[0026] 1-fire extinguishing agent container; 2-container valve; 3-striker assembly; 4-pressure generator; 5-fire extinguishing agent; 6-siphon pipe; 7-detector; 8-flexible fire extinguishing agent release pipe; 9- conversion joint; 10-pressure sensor; 11-lithium battery pack; 12-wire; 13-gunpowder; 14-needle; 15-diaphragm; 16-liquid carbon dioxide; 17-pressure release port; 18-adapter pipe; 19- shell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. It should be noted that the embodiments and features in the embodiments can be combined, separated, interchanged and / or rearranged without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] In the drawings, the size and relative sizes of parts can be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be carried out in different ways, specific process sequences can be performed in different sequences from the described ones. For example, two consecutively described processes can be performed at substantially the same time or in the reverse order of the described one. Also, like reference numerals can denote like parts throughout the specification.

[0029] When a part is referred to as being "on" or "above" another part, "connected to" or "coupled to" another part, it can be directly on, directly connected to or directly coupled to the other part, or intervening parts can be present. However, when a part is referred to as being "directly on", "directly connected to" or "directly coupled to" another part, there are no intervening parts. To that extent, the term "connected" can refer to physical or electrical connection, with or without intervening parts.

[0030] For descriptive purposes, the present disclosure can use spatially relative terms, such as "top", "bottom", "under", "below", "lower", "on", "above", "upper" and "over", to describe a relationship of one component to another component as illustrated in the figures.

[0031] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including", "includes", "having", "has", "united", "unites", "containing", "contains" and variants are used in either the detailed description and / or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising" as an open transition term without precluding any additional or other elements. It is also noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as synonyms for "about", and are employed to account for inherent variations in measuring, calculating, and / or providing a value or quantity.

[0032] Embodiment 1

[0033] One specific embodiment of the present application discloses a lithium battery pack fire suppression device which can be widely applied to fire suppression of various lithium battery packs, such as fire suppression of automobile power lithium battery packs.

[0034] As Figs. 1-2As shown, the lithium battery pack fire suppression device comprises a fire extinguishing agent container 1, a fire extinguishing agent supply pipe assembly, a detector 7 and a trigger release assembly; wherein the fire extinguishing agent container 1 is arranged outside the lithium battery pack 11, the fire extinguishing agent container 1 contains fire extinguishing agent 5, the suction port of the fire extinguishing agent supply pipe assembly extends into the interior of the fire extinguishing agent container 1, and a part of the fire extinguishing agent supply pipe assembly is arranged inside the lithium battery pack 11; the detector 7 is installed inside the lithium battery pack 11 and is configured to detect a fire occurrence signal inside the lithium battery pack 11; the trigger release assembly is configured to cause the fire extinguishing agent container 1 to supply the fire extinguishing agent 5 into the interior of the lithium battery pack 11 through the fire extinguishing agent supply pipe assembly after the detector 7 detects the fire occurrence signal.

[0035] In the embodiment, the top of the fire extinguishing agent container 1 is provided with a container valve 2, the container valve 2 is provided with a first mounting port and a second mounting port, and the fire extinguishing agent supply pipe assembly and the trigger release assembly are respectively mounted in the first mounting port and the second mounting port of the container valve 2. That is, the top of the fire extinguishing agent container 1 is provided with the first mounting port and the second mounting port, the fire extinguishing agent supply pipe assembly is sealingly mounted in the first mounting port, and the trigger release assembly is sealingly mounted in the second mounting port.

[0036] In the embodiment, the trigger release assembly comprises a pressure generator 4 and a striker assembly 3, the striker assembly 3 is mounted in the second mounting port, the tail of the striker assembly 3 is connected to the detector 7 through a wire 12, the pressure generator 4 is arranged in the fire extinguishing agent container 1 and mounted on the container valve 2, the pressure generator 4 is located below the striker assembly 3, the striker assembly 3 is mounted on the container valve 2, and a part of the striker assembly 3 is located inside the fire extinguishing agent container 1 and a part is located outside the fire extinguishing agent container 1; the pressure generator 4 contains liquid carbon dioxide 16, and the top of the pressure generator 4 is sealingly provided with a diaphragm 15, which seals the liquid carbon dioxide 16 in the pressure generator 4; the striker assembly 3 is configured to release the liquid carbon dioxide 16 into the fire extinguishing agent container 1 by piercing the diaphragm 15 of the pressure generator 4 after receiving the fire occurrence signal detected by the detector 7, so as to increase the pressure in the fire extinguishing agent container 1 to a pressure sufficient to spray the fire extinguishing agent 5.

[0037] In an alternative embodiment, the fire extinguishing agent supply pipe assembly comprises a siphon pipe 6 and a flexible fire extinguishing agent release pipe 8, the siphon pipe 6 is mounted in the first mounting port, and the outlet end of the siphon pipe 6 is connected to the container valve 2. The suction port of the siphon pipe 6 is located at the bottom of the fire extinguishing agent container 1, and the suction port of the siphon pipe 6 is extended into the bottom of the fire extinguishing agent 5 as much as possible, the siphon pipe 6 is connected to the flexible fire extinguishing agent release pipe 8, and the flexible fire extinguishing agent release pipe 8 is arranged inside the lithium battery pack 11.

[0038] In one preferred embodiment, the flexible fire extinguishing agent release pipe 8 is arranged in a curve, a zigzag or a combination of both inside the lithium battery pack 11. For example, the flexible fire extinguishing agent release pipe 8 is arranged in a U shape inside the lithium battery pack 11, and can also be arranged in an S shape, a zigzag shape or the like. In this way, the flexible fire extinguishing agent release pipe 8 can be distributed in the lithium battery pack 11 as widely as possible.

[0039] In one alternative embodiment, the outlet of the siphon pipe 6 is connected to the flexible fire extinguishing agent release pipe 8 through an adapter pipe 18, which is connected to the flexible fire extinguishing agent release pipe 8 through the conversion joint 9. The adapter pipe 18 can be made of the same material as the flexible fire extinguishing agent release pipe 8, or can be made of the same material as the siphon pipe 6.

[0040] In this embodiment, the lithium battery pack 11 is also provided with a pressure sensor 10, which is installed at the end of the flexible fire extinguishing agent release pipe 8 and is electrically connected to the control system.

[0041] In this embodiment, the striker assembly 3 includes a firecracker 13, a spike 14 and a cartridge 19. The firecracker 13 and the spike 14 are installed in the cartridge 19. The firecracker 13 is filled in the upper part of the cartridge 19 and is located above the spike 14, and the spike 14 is aligned with the diaphragm 15 of the pressure generator 4. The lower end of the cartridge 19 is open, and the spike 14 can move along the axis of the cartridge under the action of the pressure generated by the combustion of the firecracker 13 to extend out of the lower end opening to pierce the diaphragm 15 of the pressure generator 4. The cartridge 19 is provided with a pressure release port 17 on the lower part of the side wall, which is located in the fire extinguishing agent container 1, so that after the spike 14 pierces the diaphragm 15 of the pressure generator 4, the liquid carbon dioxide 16 in the pressure generator 4 enters the fire extinguishing agent container 1 through the pressure release port 17.

[0042] In this embodiment, the flexible fire extinguishing agent release pipe 8 is made of a material that can be softened by heat and broken under a certain pressure. It is preferably made of high-pressure nylon material, i.e. the flexible fire extinguishing agent release pipe 8 is a high-pressure nylon pipe.

[0043] In one alternative embodiment, the fire extinguishing agent 5 is a perfluorohexone fire extinguishing agent.

[0044] The working principle is that when the detector 7 detects that smoke or combustible gas anomaly occurs in the lithium battery pack 11, an electric signal is sent, which is a current in this case, igniting the gunpowder 13 in the striker assembly; the electric signal is sent through the wire 12 to ignite the gunpowder 13 in the striker assembly, the gunpowder 13 burns to generate pressure, which pushes the needle 14 to pierce the diaphragm 15 of the pressure generator 4, the liquid carbon dioxide 16 in the pressure generator 4 is sprayed and gasified into gaseous carbon dioxide, generating high-pressure gas in the fire extinguisher container 1, the fire extinguishing agent 5 enters the flexible fire extinguishing agent release pipe 8 through the siphon 6 under the action of the high-pressure gas, the flexible fire extinguishing agent release pipe 8 is in a high-pressure state, the pressure sensor 10 detects the pressure change and sends a pressure signal to the control system, prompting that the fire extinguishing device is in an activated state; the fire temperature in the battery pack 11 continues to rise, baking the flexible fire extinguishing agent release pipe 8, causing the flexible fire extinguishing agent release pipe 8 with high-pressure fire extinguishing agent inside to soften and break, and the fire extinguishing agent 5 is sprayed to extinguish the fire and suppress the development of the lithium battery fire.

[0045] Compared with the prior art, the lithium battery pack fire suppression device provided by the embodiment has the functions of automatic pressure charging, fire extinguishing and alarm, does not need to pre-arrange complex release pipes, control valves, detectors and controllers, and does not need to maintain a certain pressure in the fire extinguishing agent tank for a long time to ensure that the fire extinguishing agent can be effectively released when needed, does not need to check the pressure regularly, and does not need to supplement the pressure regularly; the lithium battery pack fire suppression device provided by the embodiment only needs to arrange the flexible fire extinguishing agent release pipe inside the lithium battery pack, and when the detector detects smoke or combustible gas anomaly, the flexible fire extinguishing agent release pipe is instantly filled with pressure, and when the fire temperature in the battery pack continues to rise, the flexible fire extinguishing agent release pipe is baked, causing the flexible fire extinguishing agent release pipe with high-pressure fire extinguishing agent inside to soften and break, and the fire extinguishing agent is sprayed to extinguish the fire and suppress the development of the fire. The lithium battery pack fire suppression device eliminates the daily tedious pressure maintenance work, has a simple and effective structure, and extinguishes the fire quickly and effectively.

[0046] The specific embodiments described above further illustrate the purposes, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium battery pack fire suppression device, characterized in that, include: The extinguishing agent container is located outside the lithium battery pack, and the extinguishing agent container contains extinguishing agent. The fire extinguishing agent supply pipe assembly has an intake port that extends into the interior of the fire extinguishing agent container, and a portion of the fire extinguishing agent supply pipe assembly is located inside the lithium battery pack. The detector, installed inside the lithium battery pack, is configured to detect signals of a fire occurring inside the lithium battery pack. The trigger release component is configured to supply extinguishing agent from the extinguishing agent container to the interior of the lithium battery pack through the extinguishing agent supply pipe assembly after the detector detects a fire signal.

2. The lithium battery pack fire suppression device according to claim 1, characterized in that, The top of the extinguishing agent container is provided with a first installation port and a second installation port. The extinguishing agent supply pipe assembly is sealed and installed through the first installation port, and the trigger release assembly is sealed and installed in the second installation port.

3. The lithium battery pack fire suppression device according to claim 2, characterized in that, The trigger release assembly includes a pressure generator and a striker assembly. The striker assembly is installed in the second mounting port and connected to the detector via a wire. The pressure generator is located inside the extinguishing agent container and below the striker assembly. The pressure generator contains liquid carbon dioxide, and a diaphragm is sealed on the top of the pressure generator. The striker assembly is configured to release liquid carbon dioxide into the extinguishing agent container by puncturing the diaphragm of the pressure generator after receiving a fire signal detected by the detector.

4. The lithium battery pack fire suppression device according to claim 1, characterized in that, The extinguishing agent supply pipe assembly includes a siphon pipe and a flexible extinguishing agent release pipe. The siphon pipe is installed at the first installation port, and the suction port of the siphon pipe is located at the bottom of the extinguishing agent container. The siphon pipe is connected to the flexible extinguishing agent release pipe, which is arranged inside the lithium battery pack.

5. The lithium battery pack fire suppression device according to claim 4, characterized in that, The flexible fire extinguishing agent release tube is arranged inside the lithium battery pack in a curved, broken line, or a combination of both.

6. The lithium battery pack fire suppression device according to claim 5, characterized in that, The flexible fire extinguishing agent release tube is arranged in a U-shape inside the lithium battery pack.

7. The lithium battery pack fire suppression device according to claim 4, characterized in that, The outlet of the ZSU250044CN siphon tube in claim ZSU250044CN is connected to a flexible extinguishing agent release tube via an adapter pipe, and the adapter pipe is connected to the flexible extinguishing agent release tube via a conversion joint.

8. The lithium battery pack fire suppression device according to claim 5, characterized in that, The lithium battery pack is also equipped with a pressure sensor, which is installed at the end of the flexible fire extinguishing agent release tube.

9. The lithium battery pack fire suppression device according to claim 3, characterized in that, The firing pin assembly includes gunpowder, a needle, and a casing. The gunpowder and needle are installed inside the casing. A pressure relief port is provided on the lower side wall of the casing, and the pressure relief port is located inside the extinguishing agent container.

10. The lithium battery pack fire suppression device according to any one of claims 4 to 8, characterized in that, The flexible extinguishing agent release tube is a high-pressure nylon tube.

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