Battery pack fire extinguishing device and battery pack

Abstract

The application provides a battery pack fire extinguishing device and a battery pack, wherein the battery pack fire extinguishing device comprises a flow guide cover and a fire extinguishing piece; the flow guide cover is arranged at an explosion-proof structure of a battery cell module, and the flow guide cover is provided with a flow guide cavity; the fire extinguishing piece is arranged in the flow guide cavity, and the fire extinguishing piece is provided with a fire extinguishing agent for extinguishing a fire of the battery cell module. The application solves the problem that a single battery cell thermal runaway easily causes thermal runaway to spread in the prior art.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack fire extinguishing device and a battery pack. Background Technology

[0002] The battery modules inside the battery pack consist of multiple cells, each equipped with an explosion-proof valve on top. This valve releases pressure when the internal pressure exceeds a safe threshold, preventing physical damage to the battery pack. Currently, most battery packs on the market lack effective directional flow control designs to address cell thermal runaway. If a cell experiences thermal runaway, the explosion-proof valve opens, potentially causing random electrolyte splashing, short-circuiting nearby cells, or even triggering a chain reaction throughout the battery pack, accelerating the spread of thermal runaway. Furthermore, existing fire extinguishing methods, such as external pipeline spraying of fire-fighting fluid, internal aerosol release, or modular perfluorohexanone extinguishing agents, are triggered by temperature increases. While they can control the fire to some extent, they typically exist as independent subsystems and are not tightly integrated with the battery pack's explosion-proof valves, limiting their response speed and extinguishing efficiency. In particular, modular component-based aerosol or perfluorohexanone extinguishing methods are not effective in dealing with thermal runaway events at the individual battery cell level, especially when the battery cell is far from the extinguishing device. The release of the extinguishing agent is often delayed and it is difficult to accurately cover the thermally runaway battery cell, thus reducing the success rate of extinguishing the fire. Utility Model Content

[0003] The main objective of this application is to provide a battery pack fire extinguishing device and a battery pack to solve the problem that thermal runaway of a single battery cell in the prior art can easily lead to the spread of thermal runaway.

[0004] To achieve the above objectives, according to one aspect of this application, a battery pack fire extinguishing device is provided, including a flow guide and a fire extinguishing component. The flow guide is disposed over the explosion-proof structure of the battery cell module and has a flow guide cavity. The fire extinguishing component is disposed within the flow guide cavity and contains a fire extinguishing agent for extinguishing fires in the battery cell module.

[0005] Furthermore, the deflector has a connection hole located at the explosion-proof structure, through which the deflector communicates with the explosion-proof structure.

[0006] Furthermore, the surface perpendicular to the axis of the connecting hole is the first surface, and the projected area of ​​the connecting hole on the first surface is greater than or equal to the projected area of ​​the explosion-proof structure on the first surface.

[0007] Furthermore, the flow guide includes a base plate and a cover. The base plate is connected to the battery cell module and has a connection hole. The cover is placed on the base plate, and the cover and the base plate are connected to form a flow guide cavity.

[0008] Furthermore, the cover extends along the arrangement direction of the battery cells in the battery cell module, and the two ends of the cover have openings for releasing gas, with the openings oriented along the extension direction of the cover.

[0009] Furthermore, the fairing also includes mounting portions located at both ends of the base plate. The mounting portions include a first section and a second section that are bent and connected. The first section is arranged parallel to the side of the battery cell module and abuts against the side of the battery cell module. The second section is farther away from the base plate than the first section and is used to connect with the battery cell module.

[0010] Furthermore, the fire extinguishing device is located on the cover, and each connection hole is provided with fire extinguishing agent within the orthographic projection range on the cover.

[0011] Furthermore, the fire extinguishing device includes multiple compartment structures, with the extinguishing agent located within each compartment structure.

[0012] Furthermore, the cavity structure is a hexagonal honeycomb structure.

[0013] According to another aspect of this application, a battery pack is provided, including a cell module and the aforementioned battery pack fire extinguishing device. The cell module includes multiple cells, each of which has an explosion-proof structure. The battery pack fire extinguishing device is installed on the explosion-proof structure.

[0014] Furthermore, multiple fire extinguishing devices are provided for each cell module and battery pack, and each cell module and battery pack fire extinguishing device is provided in a one-to-one correspondence.

[0015] Furthermore, the guide shroud of the battery pack fire extinguishing device has multiple connection holes, which are arranged along the arrangement direction of each battery cell in the battery cell module. Each connection hole corresponds to the explosion-proof structure of each battery cell.

[0016] By applying the technical solution of this application, a flow guide is installed at the explosion-proof structure of the battery cell module, and a fire extinguishing device is installed in the flow guide cavity. This allows the high-temperature gas and high-temperature splashes released by the explosion-proof structure to be discharged in a timely manner through the flow guide cavity after thermal runaway, thereby achieving timely pressure relief. If a high-temperature open flame occurs, the fire extinguishing device can be triggered in time to achieve rapid fire extinguishing. In this way, after the thermal runaway of a single battery cell, the flow guide cavity and fire extinguishing device can promptly guide the flow and precisely cool and extinguish the fire, thereby avoiding the disorderly diffusion of high-temperature gas during thermal runaway, which could easily ignite adjacent battery cells. At the same time, it can protect other electrical components near the explosion-proof structure, thereby controlling the spread of thermal runaway in a timely manner. This avoids the situation where traditional explosion-proof structures only have a pressure relief function and cannot suppress the spread of thermal runaway, and also avoids the situation where the fire extinguishing agent discharge device is separated from the explosion-proof structure, resulting in delayed response and limited coverage. Therefore, it can ensure that the battery pack does not catch fire or explode. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 A top view of the battery pack of this application is shown; Figure 2 An isometric view of the battery pack of this application is shown; Figure 3 A cross-sectional view of the battery pack of this application is shown; Figure 4 It shows Figure 3 A magnified view of a portion of the image; Figure 5 A schematic diagram of the battery pack fire extinguishing device of this application is shown; Figure 6 It shows Figure 5 Another structural diagram from a different angle; Figure 7 A schematic diagram of the fire extinguishing device is shown.

[0018] The above figures include the following reference numerals: 10. Flow deflector; 11. Base plate; 111. Connecting hole; 12. Cover; 13. Mounting part; 131. First section; 132. Second section; 20. Fire extinguishing component; 21. Chamber structure; 30. Battery cell module. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0022] To address the problem that thermal runaway of a single battery cell in the prior art can easily lead to the spread of thermal runaway, this application provides a battery pack fire extinguishing device and a battery pack.

[0023] like Figures 1 to 7The battery pack fire extinguishing device shown includes a flow guide 10 and a fire extinguishing component 20. The flow guide 10 covers the explosion-proof structure of the battery cell module 30 and forms a flow guide cavity between the flow guide 10 and the explosion-proof structure of the battery cell module 30. The fire extinguishing component 20 is disposed in the flow guide cavity and contains a fire extinguishing agent for extinguishing fires in the explosion-proof structure.

[0024] In this embodiment, a flow guide shroud 10 is installed at the explosion-proof structure of the battery cell module 30, and a fire extinguishing device 20 is installed in the flow guide cavity. This allows the high-temperature gas and high-temperature splashes released by the explosion-proof structure to be discharged through the flow guide cavity in a timely manner after thermal runaway, thereby achieving timely pressure relief. If a high-temperature open flame occurs, the fire extinguishing device 20 can be triggered in time to achieve rapid fire extinguishing. In this way, after thermal runaway of a single battery cell, the flow guide cavity and the fire extinguishing device 20 can timely perform directional flow guidance and precise cooling and fire extinguishing, thereby avoiding the disorderly diffusion of high-temperature gas during thermal runaway, which could easily ignite adjacent battery cells. At the same time, it can protect other electrical components near the explosion-proof structure, thereby timely controlling the spread of thermal runaway. This avoids the situation where traditional explosion-proof structures only have pressure relief functions and cannot suppress the spread of thermal runaway. It also avoids the situation where the fire extinguishing agent discharge device is separated from the explosion-proof structure, resulting in delayed response and limited coverage. This ensures that the battery pack does not catch fire or explode.

[0025] It should be noted that the battery pack mentioned in this embodiment includes multiple cell modules 30, and each cell module 30 is respectively provided with a flow guide 10. The flow guide 10 extends along the arrangement direction of the cells in each cell module 30, so that a single flow guide 10 can cover all the explosion-proof structures in the cell module 30, thereby achieving full coverage of all explosion-proof structures.

[0026] like Figure 6 As shown, in this embodiment, the flow guide 10 has a connection hole 111 located at the explosion-proof structure. The flow guide 10 communicates with the explosion-proof structure through the connection hole 111, allowing the explosion-proof structure to directly communicate with the flow guide cavity, thereby enabling timely pressure relief of the high-temperature gas and high-temperature splashes from the explosion-proof structure. Specifically, the flow guide 10 has a connection hole 111 on the side near the explosion-proof structure. The end of the connection hole 111 near the explosion-proof structure can be fitted onto the outer periphery of the explosion-proof structure, allowing the spray port of the explosion-proof structure to directly communicate with the flow guide cavity. This allows the high-temperature gas or high-temperature splashes ejected from the spray port of the explosion-proof structure to directly enter the flow guide cavity when the explosion-proof structure goes out of control, so that they can be discharged from the flow guide cavity in time or extinguished by the fire extinguishing device 20 in time. This can prevent the spray from the explosion-proof structure from spraying around the explosion-proof structure and causing short circuits in other cells or damage to other electrical components, such as preventing wire harness burnout, thereby preventing the spread of thermal runaway caused by a single cell. In this embodiment, the high-temperature sprayed material refers to substances such as electrolyte that are sprayed from inside the battery cell.

[0027] Preferably, the surface perpendicular to the axis of the connecting hole 111 is the first surface, and the projected area of ​​the connecting hole 111 on the first surface is greater than or equal to the projected area of ​​the explosion-proof structure on the first surface. This allows the cross-sectional size of the connecting hole to cover the explosion-proof structure, so that the splashes or high-temperature gas at the explosion-proof structure can smoothly pass through the connecting hole 111 into the guide cavity, thereby further improving the connectivity effect of the connecting hole 111.

[0028] In this embodiment, there are multiple connection holes 111, which are arranged along the arrangement direction of the cells within the cell module 30. Each connection hole 111 corresponds one-to-one with multiple explosion-proof structures of the cell module 30, ensuring that each explosion-proof structure has an independent connection hole 111 communicating with the flow-guiding cavity. This ensures that if any explosion-proof structure malfunctions, the high-temperature gas or splashes it generates can be immediately captured and enter the flow-guiding cavity, triggering the release of the extinguishing agent in a timely manner. Specifically, the arrangement of the connection holes 111 in this embodiment is based on the layout of the cells within the cell module 30, allowing each connection hole 111 to correspond to the explosion-proof structure of each cell. This achieves comprehensive protection for all cells within the battery pack. Thus, even if multiple points experience simultaneous thermal runaway, each can be responded to and handled quickly, greatly improving the coverage and efficiency of fire suppression.

[0029] like Figure 5As shown, in this embodiment, the flow guide shroud 10 includes a base plate 11 and a cover 12. The base plate 11 is connected to the battery cell module 30 and has a connection hole 111. The cover 12 is placed on the base plate 11, and the cover 12 and the base plate 11 are connected to form a flow guide cavity. In this way, the combination of the base plate 11 and the cover 12 forms a flow guide cavity extending along the arrangement direction of each battery cell in the battery cell module 30, thereby guiding high-temperature gases to be discharged along a designated path. The connection hole 111 on the base plate 11 can ensure that the gas and splashes generated during thermal runaway of the battery cell can smoothly enter the flow guide cavity, while the cover 12 serves to isolate other components of the battery cell and other battery cells, preventing high-temperature gas or high-temperature splashes from damaging other parts of the battery cell or other battery cells. Specifically, in this embodiment, both the base plate 11 and the cover 12 extend along the arrangement direction of each cell within the cell module 30. The base plate 11 is closer to the explosion-proof structure of the cell module 30 than the cover 12, and the base plate 11 is set parallel to the surface of the cell where the explosion-proof structure is located. The cover 12 can be configured as a U-shaped structure, that is, the cover 12 includes a top cover and two side plates located on both sides of the top cover. The sides of the base plate 11 can be provided with protruding sections extending towards the cover 12 to facilitate the connection between the side plates of the cover 12 and the base plate 11. In this way, the cover 12 and the base plate 11 form a rectangular flow guide cavity, thereby optimizing the gas emission path, avoiding direct impact of thermal runaway gas on other components inside the battery pack, and reducing potential secondary damage. Optionally, the flow guide 10 can be made of high-temperature resistant plastic, such as polyetheretherketone (PEEK).

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, the cover 12 extends along the arrangement direction of the battery cells within the battery cell module 30. Both ends of the cover 12 have openings for releasing gas, with the openings oriented along the extending direction of the cover 12. This allows gas to be guided out of the openings in an orderly manner, preventing the disorderly diffusion of high-temperature gas inside the battery pack, thereby reducing damage to other battery cells and electrical components. This also ensures that the pressure inside the battery pack can be effectively controlled in the event of thermal runaway, preventing explosions caused by excessive pressure and protecting the safety of equipment and personnel.

[0031] like Figure 5As shown, in this embodiment, the air guide 10 also includes mounting portions 13 located at both ends of the base plate 11. The mounting portions 13 include a first section 131 and a second section 132 that are bent and connected. The first section 131 is arranged parallel to the side of the cell module 30 and abuts against the side of the cell module 30. The second section 132 is farther away from the base plate 11 than the first section 131 and is used to connect with the cell module 30. Thus, through the special structure of the mounting portion 13, it is ensured that the air guide 10 can be stably installed on the cell module 30 without affecting the overall structure and electrical performance of the battery pack. Specifically, this embodiment has two mounting portions 13, located at both ends of the base plate 11. The mounting portions 13 are L-shaped. The first segment 131 is connected to the base plate 11 and is perpendicular to the extending direction of the base plate 11, extending away from the cover 12. This allows the two battery cell modules 30 to be positioned between the two first segments 131, thus limiting the position of the flow guide 10 and preventing movement of the flow guide 10 along the battery cell arrangement direction. The second segment 132 is perpendicular to the first segment 131 and extends away from the battery cell module 30. The second segment 132 can have mounting holes to facilitate connection and fixation with other components such as the battery pack housing. The mounting portions 13 improve the stability and adaptability of the flow guide 10, maintaining good flow guiding performance even under vibration or impact environments, thereby preventing protection failure due to improper installation.

[0032] like Figure 4 As shown, in this embodiment, the fire extinguishing element 20 is located on the cover 12, and each connecting hole 111 is provided with fire extinguishing agent within its orthographic projection range on the cover 12. By precisely arranging the fire extinguishing element 20 on the cover 12, the fire extinguishing agent can directly act on the nozzle of the explosion-proof structure of the thermal runaway battery cell, thereby achieving a rapid and precise fire extinguishing effect. Specifically, considering that high-temperature gas or high-temperature splashes are ejected from the nozzle of the explosion-proof structure, and that the high-temperature gas or high-temperature splashes are ejected onto the top cover of the cover 12 according to the spray direction, the fire extinguishing element 20 in this embodiment is configured as a plate-like structure, parallel to the top cover of the cover 12. The fire extinguishing element 20 can be attached to the inner wall of the top cover, thereby allowing for the placement of more fire extinguishing agent. In this embodiment, the fire extinguishing element 20 is positioned directly opposite the nozzle of the explosion-proof structure.

[0033] Preferably, based on the spray range of the explosion-proof structure, the position directly opposite the spray nozzle of the explosion-proof structure is provided with extinguishing agent. Therefore, the explosion-proof structure is positioned within the orthogonal projection range on the top cover of the cover plate to ensure the timely action of the extinguishing agent, improve its utilization rate, and avoid low extinguishing efficiency due to uneven distribution of the extinguishing agent. Of course, extinguishing agent can also be placed at other positions on the extinguishing element 20 besides within the orthogonal projection range of the connecting hole 111 on the cover 12 to further improve the extinguishing effect.

[0034] like Figure 7 As shown, in this embodiment, the fire extinguishing device 20 includes multiple compartmentalized structures 21. The extinguishing agent is located within each compartmentalized structure 21, thus dividing the fire extinguishing device 20 into multiple independent small chambers. This allows for the release of an appropriate amount of extinguishing agent as needed in the event of thermal runaway, ensuring effective extinguishing while avoiding resource waste caused by excessive release, thereby improving the flexibility and economy of fire extinguishing. For example, when one of the battery cells experiences thermal runaway, the explosion-proof structure of the cell sprays high-temperature gas and high-temperature projectiles, triggering the extinguishing agent in the compartmentalized structure 21 near the explosion-proof structure, without triggering the extinguishing agent in the compartmentalized structures 21 of other safe areas. This achieves efficient utilization of the extinguishing agent, avoiding the situation where modular aerosol or modular perfluorohexanone fire extinguishing methods are ineffective against single battery cell thermal runaway and are prone to difficulty in ensuring timely fire extinguishing due to the distance between them.

[0035] In this embodiment, the cavity structure 21 is a hexagonal honeycomb structure. Utilizing the stability and high specific surface area of ​​the hexagonal honeycomb structure, it not only ensures the uniform distribution of the extinguishing agent in all directions but also accelerates the atomization process, thereby improving extinguishing efficiency. Specifically, the honeycomb structure is arranged along the surface of the extinguishing element 20. The honeycomb structure can be made of a thermally responsive copolymer with a melting temperature of 90℃±5℃, and the extinguishing agent can be perfluorohexanone ultrafine powder with a particle size ≤20μm. The volume of the honeycomb structure can be set to 0.2ml, thus enabling the rapid formation of an extinguishing agent cloud covering the heat source in the early stages of thermal runaway, effectively suppressing flame spread. Simultaneously, the stability of the hexagonal structure ensures the structural integrity of the extinguishing element 20 during long-term use. In this embodiment, the extinguishing process involves the surface of the cavity structure 21 melting, followed by self-atomization of the extinguishing agent powder upon contact with air. The specific surface area is ≥5000cm² / g, and the heat absorption efficiency is increased by 40%. This linkage mechanism, in which the flow deflector 10 directs the flow, the extinguishing agent cools and extinguishes the fire, and the flow deflector 10 depressurizes, can ensure that the thermal runaway response time is shortened to 0.5 seconds.

[0036] This embodiment also provides a battery pack, including a cell module 30 and the aforementioned battery pack fire extinguishing device. The cell module 30 includes multiple cells, each of which has an explosion-proof structure. The battery pack fire extinguishing device is installed on the explosion-proof structure. In this way, the battery pack fire extinguishing device is integrated as a component of the battery pack and closely combined with the cell module 30 to form a complete thermal runaway protection system. This allows the battery pack to have a high level of fire safety performance when it leaves the factory, without the need for additional fire-fighting equipment to be installed later.

[0037] In this embodiment, multiple battery cell modules 30 and battery pack fire extinguishing devices are provided, and the battery cell modules 30 and battery pack fire extinguishing devices are arranged in a one-to-one correspondence. The arrangement direction of each battery cell module 30 is perpendicular to the arrangement direction of each battery cell within the battery cell module 30. Consequently, each battery pack fire extinguishing device is arranged in parallel, thereby equipping each battery cell module 30 with an independent battery pack fire extinguishing device, forming a multi-point protection network, thereby improving the thermal runaway protection capability of the entire battery pack and avoiding the chain reaction of thermal runaway.

[0038] The battery pack of this embodiment can be applied in the energy storage industry, primarily as a liquid-cooled energy storage battery pack. It features 1P48S or 1P52S batteries, liquid cooling, and an IP67 protection rating. The liquid-cooled energy storage battery pack includes a cell module 30, which contains cells. Each cell has an explosion-proof structure, i.e., an explosion-proof valve, on its top. A flow guide 10 is positioned directly above the explosion-proof structure, directly above the chamber structure 21 of the fire extinguishing device 20. The chamber structure 21 contains perfluorohexanone (PFH) extinguishing agent. In the event of thermal runaway of the cell, if a high-temperature open flame occurs, the PFH extinguishing agent can be directly triggered to extinguish the fire. The position of the flow guide 10 relative to the cell module 30 is determined by the position of the explosion-proof structure. When the explosion-proof structure is positioned in the middle of the cell surface, the flow guide 10 is also positioned in the middle of the corresponding surface of the cell module 30. Of course, the battery pack of this embodiment can also be applied in other scenarios.

[0039] It should be noted that "multiple" in the above embodiments refers to at least two.

[0040] As can be seen from the above description, the embodiments of this application achieve the following technical effects: 1. This solves the problem that thermal runaway of a single battery cell can easily lead to the propagation of thermal runaway in existing technologies; 2. By setting a flow guide at the explosion-proof structure of the battery cell module and installing a fire extinguishing device in the flow guide cavity, the high-temperature gas and high-temperature splashes released by the explosion-proof structure can be discharged in time through the flow guide cavity after thermal runaway of the explosion-proof structure, thereby achieving timely pressure relief. If a high-temperature open flame occurs, the fire extinguishing device can be triggered in time to achieve rapid fire extinguishing.

[0041] 3. After a single battery cell experiences thermal runaway, the flow guiding cavity and fire extinguishing device can promptly guide the flow and precisely cool down the fire, thus preventing the disorderly diffusion of high-temperature gases during thermal runaway from easily igniting adjacent battery cells. At the same time, it can protect other electrical components near the explosion-proof structure, thereby controlling the spread of thermal runaway in a timely manner. This avoids the situation where traditional explosion-proof structures only have pressure relief functions and cannot suppress the spread of thermal runaway. It also avoids the situation where the fire extinguishing agent discharge device is separated from the explosion-proof structure, resulting in delayed response and limited coverage. Therefore, it can ensure that the battery pack does not catch fire or explode.

[0042] Obviously, the embodiments described above are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort should fall within the scope of protection of this application.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack fire extinguishing device, characterized in that, include: A flow guide (10) is provided on the explosion-proof structure of the battery cell module (30), and the flow guide (10) is provided with a flow guide cavity; Fire extinguishing device (20) is disposed in the flow guiding cavity and contains fire extinguishing agent for extinguishing fire in the battery cell module (30).

2. The battery pack fire extinguishing device according to claim 1, characterized in that, The flow guide (10) has a connection hole (111) located at the explosion-proof structure, and the flow guide (10) communicates with the explosion-proof structure through the connection hole (111).

3. The battery pack fire extinguishing device according to claim 2, characterized in that, The surface perpendicular to the axis of the connecting hole (111) is the first surface, and the projected area of ​​the connecting hole (111) on the first surface is greater than or equal to the projected area of ​​the explosion-proof structure on the first surface.

4. The battery pack fire extinguishing device according to claim 2, characterized in that, The flow deflector (10) includes: A base plate (11) is connected to the battery cell module (30), and the base plate (11) has the connection hole (111); Cover (12) is placed on the base plate (11), and the cover (12) and the base plate (11) are connected to form the flow guide cavity.

5. The battery pack fire extinguishing device according to claim 4, characterized in that, The cover (12) extends along the arrangement direction of the cells in the cell module (30), and the two ends of the cover (12) have openings for releasing gas, the direction of which is along the extension direction of the cover (12).

6. The battery pack fire extinguishing device according to claim 4, characterized in that, The air guide (10) also includes mounting portions (13) located at both ends of the base plate (11). The mounting portions (13) include a first section (131) and a second section (132) that are bent and connected. The first section (131) is arranged parallel to the side of the battery cell module (30) and abuts against the side of the battery cell module (30). The second section (132) is farther away from the base plate (11) than the first section (131) and is used to connect with the battery cell module (30).

7. The battery pack fire extinguishing device according to claim 4, characterized in that, The fire extinguishing component (20) is located on the cover (12), and each of the connecting holes (111) is provided with the fire extinguishing agent within the orthographic projection range on the cover (12).

8. The battery pack fire extinguishing device according to any one of claims 1 to 7, characterized in that, The fire extinguishing device (20) includes multiple compartment structures (21), and the fire extinguishing agent is located within the compartment structures (21).

9. The battery pack fire extinguishing device according to claim 8, characterized in that, The cavity structure (21) is a hexagonal honeycomb structure.

10. A battery pack, characterized in that, include: A battery cell module (30) includes multiple battery cells, each of which has an explosion-proof structure; The battery pack fire extinguishing device according to any one of claims 1 to 9, wherein the battery pack fire extinguishing device is disposed on the explosion-proof structure.

11. The battery pack according to claim 10, characterized in that, Multiple battery cell modules (30) and battery pack fire extinguishing devices are provided, and each battery cell module (30) and battery pack fire extinguishing device is provided in a one-to-one correspondence.

12. The battery pack according to claim 10, characterized in that, The guide shroud (10) of the battery pack fire extinguishing device has a connection hole (111). There are multiple connection holes (111). The connection holes (111) are arranged along the arrangement direction of each cell in the cell module (30). Each connection hole (111) is set in correspondence with the explosion-proof structure of each cell.

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