Built-in fire suppression device for lithium ion battery pack

Abstract

The invention discloses a lithium ion battery pack built-in fire suppression device which comprises a box body, a fire extinguishing agent is arranged in the box body, a plurality of nozzles are arranged on the periphery of the box body, a fixed temperature and smoke sensor and a feedback switch are arranged outside one end of the box body, the temperature and smoke sensor and the feedback switch are both linear, and the temperature and smoke sensor and the feedback switch are arranged in the box body. One end is fixedly connected with the fire extinguishing agent, and the other end extends below the box body. The box body is fixed at the top in the battery box through the mounting lugs, and a battery pack is arranged at the bottom in the battery box. The device has the advantages that the built-in temperature and smoke sensor and double automatic induction starting are achieved, the device is superior to traditional manual operation fire extinguishing, the initial fire behavior of the lithium ion battery pack can be inhibited in advance, people escape time is provided, and major fire accidents caused by fire spreading due to the fact that individual single body is on fire are prevented; the device is an ideal fire suppression device for the lithium ion battery pack.

Description

Technical Field

[0001] This invention relates to the technical field of fire suppression devices built into lithium-ion battery packs, specifically to a fire suppression device built into a lithium-ion battery pack. Background Technology

[0002] my country has 380 million electric bicycles, making it the world's largest carrier of green transportation. In the first half of 2025, sales of electric two-wheelers reached 32.325 million units, a year-on-year increase of 29.5%.

[0003] However, due to the use of high-energy-density lithium-ion batteries in electric bicycles, fires occur frequently. According to statistics from the National Fire and Rescue Administration, over 19,000 electric bicycle fires were reported in 2024, with 9,175 occurring nationwide from May to December 2024, resulting in multiple deaths and injuries. Compared to other types of fires, electric bicycle fires develop rapidly and have a high fatality and injury rate. Fires caused by electric bicycles have become a prominent issue affecting the modernization of national ecological civilization construction and governance capabilities. Furthermore, because lithium-ion batteries are installed in enclosed enclosures, fire suppression agents cannot be effectively applied to the battery surface during the initial stages of battery thermal runaway, significantly reducing their extinguishing effectiveness. Therefore, developing a fire suppression device built into the lithium-ion battery pack can improve fire extinguishing efficiency and reduce the occurrence of fires. Summary of the Invention

[0004] The purpose of this invention is to provide a fire suppression device built into a lithium-ion battery pack to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solutions: The present invention discloses a fire suppression device built into a lithium-ion battery pack, comprising a housing containing a fire extinguishing agent, and several nozzles around the housing. A fixed temperature and smoke sensor and a feedback switch are provided on one end of the housing. The temperature and smoke sensor and the feedback switch are both linear, with one end fixedly connected to the fire extinguishing agent and the other end extending to the bottom of the housing.

[0006] As an improvement, the box body is a square box.

[0007] As an improvement, the extinguishing agent is a chemical agent that undergoes a chemical reaction when exposed to high temperatures, releasing smoke that suppresses the fire.

[0008] As an improvement, the temperature and smoke sensor includes a fixed integrated temperature sensor and smoke sensor.

[0009] As an improvement, the top of the housing is provided with several fixed mounting ears.

[0010] As an improvement, the housing is fixed to the top of the battery box by mounting ears, and the battery pack is located at the bottom of the battery box.

[0011] The advantages of this invention compared to existing technologies are: built-in temperature and smoke sensors, dual automatic sensing activation, superior to traditional manual fire suppression, can suppress the initial fire of lithium-ion battery packs in advance, provide time for personnel to escape, and prevent the fire from spreading due to individual individual fires and causing major fire accidents. It is an ideal device for suppressing fires in lithium-ion battery packs. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings listed below are only some structural schematic diagrams of the present invention, and not all of them.

[0013] Figure 1 This is a schematic diagram of the structure of a fire suppression device built into a lithium-ion battery pack according to the present invention. Figure 1 .

[0014] Figure 2 This is a schematic diagram of the structure of a fire suppression device built into a lithium-ion battery pack according to the present invention. Figure 2 .

[0015] Figure 3 This is a cross-sectional view of the installation state of a fire suppression device built into a lithium-ion battery pack according to the present invention.

[0016] Figure label: 1. Box body; 11. Nozzle; 12. Mounting ear; 2. Temperature and smoke sensor; 3. Feedback switch; 4. Extinguishing agent; 5. Battery box; 6. Battery pack. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0019] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance. The use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be perfectly horizontal, but can be slightly tilted.

[0020] In the description of the embodiments of the present invention, the terms "multiple" or "several" refer to at least two.

[0021] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0022] This embodiment, in conjunction with the accompanying drawings, provides a detailed description of a fire suppression device built into a lithium-ion battery pack.

[0023] This embodiment describes a fire suppression device built into a lithium-ion battery pack, such as... Figure 1 , Figure 2 As shown, the device includes a box body 1, which contains a fire extinguishing agent 4. Several nozzles 11 are arranged around the box body 1. A fixed temperature and smoke sensor 2 and a feedback switch 3 are arranged on one end of the box body 1. The feedback switch 3 is connected to a terminal. The temperature and smoke sensor 2 and the feedback switch 3 are both linear, with one end fixedly connected to the fire extinguishing agent 4 and the other end extending to the bottom of the box body 1.

[0024] like Figure 1 , Figure 2 As shown, the box body 1 is a square box.

[0025] The extinguishing agent 4 is a chemical agent that will undergo a chemical reaction when exposed to high temperatures, releasing smoke that suppresses the fire.

[0026] The temperature and smoke sensor 2 includes a fixed integrated temperature sensor and a smoke sensor.

[0027] like Figure 1 , Figure 2 As shown, the top of the box 1 is provided with several fixed mounting ears 12.

[0028] like Figure 3 As shown, the box body 1 is fixed to the top of the battery box 5 by mounting ears 12, and the battery box 5 has a battery pack 6 at the bottom.

[0029] In practice, fires in lithium-ion battery packs 6 typically begin with one or two cells experiencing thermal runaway, triggering a chain reaction. When a cell in the lithium-ion battery pack 6 experiences thermal runaway, and the heat reaches a certain temperature or the smoke concentration reaches a certain level, the temperature and smoke sensors 2 automatically detect this and activate the extinguishing agent 4. The extinguishing agent 4 is then sprayed through nozzles 11 around the housing 1, targeting the battery cells and extinguishing the fire in the thermally runaway cells within 10 seconds, preventing other cells from experiencing thermal runaway and avoiding the formation of a fire in the entire battery pack 6. Simultaneously with the activation of the extinguishing agent 4, the feedback switch 3 sends a signal to the end user, triggering the alarm device to prompt personnel to evacuate, display the fire situation, and facilitate immediate firefighting efforts by firefighters, preventing casualties and the spread of the fire to avoid greater economic losses.

[0030] The present invention and its embodiments have been described above. This description is not restrictive, and the actual scope of protection is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this invention should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A fire suppression device built into a lithium-ion battery pack, characterized in that, Includes a box body (1), inside which is a fire extinguishing agent (4), and around which are several nozzles (11). A fixed temperature and smoke sensor (2) and a feedback switch (3) are provided on one end of the box body (1). The temperature and smoke sensor (2) and the feedback switch (3) are both linear, with one end fixedly connected to the fire extinguishing agent (4) and the other end extending to the bottom of the box body (1).

2. The fire suppression device built into a lithium-ion battery pack according to claim 1, characterized in that, The box (1) is a square box.

3. The fire suppression device built into a lithium-ion battery pack according to claim 1, characterized in that, The extinguishing agent (4) is a chemical agent that will undergo a chemical reaction when exposed to high temperatures to release smoke that suppresses fire.

4. A fire suppression device built into a lithium-ion battery pack according to claim 1, characterized in that, The temperature and smoke sensor (2) includes a fixed integrated temperature sensor and a smoke sensor.

5. A fire suppression device built into a lithium-ion battery pack according to claim 1, characterized in that, The top of the box (1) is provided with several fixed mounting ears (12).

6. A fire suppression device built into a lithium-ion battery pack according to claim 5, characterized in that, The box (1) is fixed to the top of the battery box (5) by mounting ears (12), and the battery box (5) has a battery pack (6) at the bottom.

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