Flame arresters, battery packs and energy storage devices

Abstract

This application relates to the field of battery technology, specifically disclosing a flame arrester, a battery pack, and an energy storage device. The battery pack includes a casing, battery cells, and an explosion-proof valve. The flame arrester includes a flame-arresting sheet and a mounting base. The flame-arresting sheet is constructed with a loose, porous structure, and the pore size of the flame-arresting sheet is no larger than the quenching diameter of the flame generated by the battery cell during thermal runaway. The mounting base is fitted into the casing and is at least partially housed within the casing. The mounting base has a mounting hole that communicates with the interior of the casing and is positioned opposite the explosion-proof valve. The flame-arresting sheet is installed within the mounting hole and abuts against the explosion-proof valve. The aforementioned flame arrester comprises only two components: the mounting base and the flame-arresting sheet, resulting in a simple structure. Furthermore, the "fitting + inner sleeve" mounting method allows for a more compact overall flame arrester, reducing its overall size and facilitating the miniaturization design of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a flame arrester, a battery pack, and an energy storage device. Background Technology

[0002] In a battery pack, when a cell experiences thermal runaway, it releases a large amount of energy, generating a mixture of high-temperature runaway gases and particles, and may eject flames and / or high-temperature sparks. In related technologies, to reduce the mechanical impact and thermal hazards to the battery pack caused by runaway behavior, flame arresters are typically installed to prevent the spread of flames from the combustion ejecta. However, existing flame arresters have numerous components and a large overall size, which is detrimental to the miniaturization design of battery packs. Utility Model Content

[0003] In view of this, this application provides a flame arrester, a battery pack, and an energy storage device to improve the technical problem that existing battery packs are difficult to miniaturize due to the large size of the flame arrester.

[0004] One embodiment of this application provides a flame arrester. The flame arrester is configured to be installed in a battery pack. The battery pack includes a housing, battery cells located inside the housing, and an explosion-proof valve capable of connecting the interior of the housing to the external environment in the event of thermal runaway of the battery cells. The flame arrester includes a flame-arresting sheet and a mounting base. The flame-arresting sheet is constructed with a loose, porous structure, and the pore size of the flame-arresting sheet is no larger than the quenching diameter of the flame generated by the battery cells during thermal runaway. The mounting base is configured to fit into the housing and is at least partially housed within the housing. The mounting base has a mounting hole configured to communicate with the interior of the housing and to be positioned opposite the explosion-proof valve. The flame-arresting sheet is installed within the mounting hole and configured to be in contact with the explosion-proof valve.

[0005] The aforementioned flame arrester consists of only two components: a mounting base and a flame arrestor plate, resulting in a simple structure. Furthermore, the mounting base is fitted into the outer shell, and the flame arrestor plate is installed within the mounting hole of the mounting base and abuts against the explosion-proof valve. This "fitting + inner sleeve" installation method allows for a more compact overall flame arrester, reducing its overall size and facilitating the miniaturization of the battery pack.

[0006] In some embodiments of this application, the size of the pores in the flame arrestor is defined as D1, and the quenching diameter of the flame generated by the battery cell during thermal runaway is defined as D2, where D1 = 1 / 2 * D2.

[0007] When a flammable gas mixture (such as carbon monoxide and hydrogen) generated by thermal runaway of a battery cell is ignited, the flame propagation produces an extremely strong shock wave and extremely high pressure. Due to the rapid increase in pressure difference, the flame arrestor is prone to deformation or rupture under the action of the shock wave and extremely high pressure, leading to damage and failure of the entire flame arrester. By introducing a safety factor of 0.5, the flame arrestor can be ensured to have better structural strength, thereby ensuring the safety of the flame arrester under extreme operating conditions.

[0008] In some embodiments of this application, the size of the pores in the flame arrestor is 0.4 mm to 0.6 mm.

[0009] In some embodiments of this application, the flame arrestor is constructed by hot pressing multiple layers of metal wire mesh, wherein the mesh openings in the multiple layers of metal wire mesh collectively form the pores.

[0010] By "stacked and hot-pressed multi-layer metal mesh", a flame-arresting sheet with a "pancake-like structure" can be formed. The flame-arresting sheet is more compact and has finer pores, which can better reduce the size of the flame-arresting sheet while ensuring the flame-arresting effect of the flame arrester, thus contributing to the miniaturization design of battery packs.

[0011] In some embodiments of this application, the mesh count of the multilayer metal wire mesh is different, and the mesh count of the multilayer metal wire mesh gradually increases along the direction of flame spread, with the pores gradually narrowing.

[0012] By designing a "gradually narrowing" pore structure, tiered filtration of combustion particles can be achieved. This not only reduces the risk of combustion particles clogging the flame arrestor, but also improves the flame arrestor's interception rate of combustion particles, thus enhancing the flame arrestor's flame-arresting effect and reducing the risk of combustion particles surging to the outside of the battery pack casing.

[0013] In some embodiments of this application, the mesh count difference between two adjacent layers of metal wire mesh is ≥50 mesh.

[0014] By setting the difference in mesh count between two adjacent metal meshes to be no less than 50 meshes, the turbulence intensity of the flame between metal meshes of different mesh counts can be increased, thereby accelerating the energy dissipation of the flame and improving the flame-retardant effect of the flame arrestor.

[0015] In some embodiments of this application, the flame arrester further includes an end cap configured to connect to the housing and cover the mounting base, the flame arrestor plate, and the explosion-proof valve. The end cap has densely arranged through holes configured to allow gas to pass through.

[0016] By installing end caps, the risk of external contaminants (such as dust, fallen leaves, etc.) entering the pores of the flame arrestor and causing blockage can be reduced, which helps to ensure the stable operation of the flame arrestor and extend its service life.

[0017] In some embodiments of this application, an assembly gap is formed between the flame arrestor and the end cap along the direction of flame propagation, and the assembly gap is smaller than the pores in the flame arrestor.

[0018] By leaving an assembly gap between the flame arrestor and the end cap, the risk of the flame arrestor failing due to thermal expansion can be reduced; secondly, a buffer space can be provided for the flame, reducing the risk of the end cap exploding due to violent spraying.

[0019] In some embodiments of this application, the pores in the flame arrestor plate at least partially coincide with the through holes along the direction of flame propagation.

[0020] When thermal runaway occurs in a battery cell, high-temperature gas can flow directly and smoothly out of the external environment along the vias. By ensuring that the pores in the flame arrestor at least partially overlap with the vias, the flow resistance of high-temperature gas can be reduced, thereby lowering the risk of the flame arrestor exploding due to excessive airflow resistance and improving the safety of the battery pack.

[0021] One embodiment of this application provides a battery pack. The battery pack includes a housing, battery cells, an explosion-proof valve, and a flame arrester as described in any of the above embodiments. The battery cells are mounted inside the housing. The explosion-proof valve is mounted on the housing and configured to connect the interior of the housing to the external environment in the event of thermal runaway of the battery cells. A mounting base is fitted into the housing and at least partially housed within the housing, and a flame arrester is mounted on the mounting base and abuts against the explosion-proof valve.

[0022] The aforementioned battery pack uses the same flame arrester. The flame arrester consists of only two components: a mounting base and a flame-arresting plate, resulting in a simple structure. Furthermore, the mounting base is fitted into the outer shell, and the flame-arresting plate is installed within the mounting hole of the mounting base and abuts against the explosion-proof valve. This "fitting + inner sleeve" installation method allows for a more compact flame arrester, reducing its overall size and facilitating miniaturization of the battery pack.

[0023] One embodiment of this application provides an energy storage device. The energy storage device includes a device body and the aforementioned battery pack. The battery pack is mounted on the device body.

[0024] The aforementioned energy storage device uses the aforementioned battery pack. The flame arrester consists of only two components: a mounting base and a flame arrestor plate, resulting in a simple structure. Furthermore, the mounting base is fitted into the outer shell, and the flame arrestor plate is installed within the mounting hole of the mounting base and abuts against the explosion-proof valve. This "fitting + inner sleeve" installation method allows for a more compact flame arrester, reducing its overall size and facilitating the miniaturization of the battery pack. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0026] Figure 1 This is a schematic diagram of the structure of a battery pack provided in one embodiment of this application;

[0027] Figure 2 for Figure 1 The diagram shows the exploded structure of the battery pack.

[0028] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the battery pack after it has been cut along line AA.

[0029] Explanation of key component symbols:

[0030] 100. Battery pack; 10. Outer casing; 20. Battery cell; 30. Explosion-proof valve; 40. Flame arrester; 41. Mounting base; 42. Flame arrester plate; 43. End cap; 44. Assembly gap; 411. Mounting hole; 431. Through hole. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] In a battery pack, when a cell experiences thermal runaway, it releases a large amount of energy, generating a mixture of high-temperature runaway gases and particles, and may eject flames and / or high-temperature sparks. In related technologies, to reduce the mechanical impact and thermal hazards to the battery pack caused by runaway behavior, flame arresters are typically installed to prevent the spread of flames from the combustion ejecta. However, existing flame arresters have numerous components and a large overall size, which is detrimental to the miniaturization design of battery packs.

[0034] One embodiment of this application provides a flame arrester. The flame arrester is configured to be installed in a battery pack. The battery pack includes a housing, battery cells located inside the housing, and an explosion-proof valve capable of connecting the interior of the housing to the external environment in the event of thermal runaway of the battery cells. The flame arrester includes a flame-arresting sheet and a mounting base. The flame-arresting sheet is constructed with a loose, porous structure, and the pore size of the flame-arresting sheet is no larger than the quenching diameter of the flame generated by the battery cells during thermal runaway. The mounting base is configured to fit into the housing and is at least partially housed within the housing. The mounting base has a mounting hole configured to communicate with the interior of the housing and to be positioned opposite the explosion-proof valve. The flame-arresting sheet is installed within the mounting hole and configured to be in contact with the explosion-proof valve.

[0035] The aforementioned flame arrester consists of only two components: a mounting base and a flame arrestor plate, resulting in a simple structure. Furthermore, the mounting base is fitted into the outer shell, and the flame arrestor plate is installed within the mounting hole of the mounting base and abuts against the explosion-proof valve. This "fitting + inner sleeve" installation method allows for a more compact overall flame arrester, reducing its overall size and facilitating the miniaturization of the battery pack.

[0036] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the embodiments and features described below can be combined with each other. It should be noted that, due to the complexity of the pore structure, the pores of the flame arrestor 42 are not illustrated in the accompanying drawings of this application.

[0037] One embodiment of this application provides an energy storage device (not shown). The energy storage device has the functions of storing and discharging electricity for use as backup power for homes, production units, outdoor work, and outdoor recreation.

[0038] In some embodiments, the energy storage device includes a device body (not shown) and a battery pack 100, which is mounted on the device body and is used to store and supply electricity to the device body. The battery pack 100 can also be used as a standalone device to output DC power, or it can be stacked together with an inverter module.

[0039] In some embodiments, the energy storage device includes a power conversion module (not shown) electrically connected to the battery pack 100. The power conversion module is used to control the AC / DC conversion of the output current of the battery pack 100. The energy storage device equipped with the power conversion module can be a small portable power bank, a residential energy storage power supply, an industrial or commercial energy storage power supply, or a containerized energy storage power supply, etc.

[0040] In some embodiments, the power conversion module may be omitted. Energy storage devices without a power conversion module can be used independently. Energy storage devices without a power conversion module typically only output DC power. When used independently, energy storage devices without a power conversion module can be used in conjunction with energy storage devices that have a power conversion module as a power system providing additional battery capacity.

[0041] Please refer to the following: Figures 1 to 3 In some embodiments, the battery pack 100 includes a housing 10 and battery cells 20, with the battery cells 20 installed inside the housing 10. The housing 10 isolates the battery cells 20 from the external environment, thus protecting them.

[0042] In some embodiments, the battery pack 100 further includes an explosion-proof valve 30, which is mounted on the housing 10. The explosion-proof valve 30 is configured to connect the interior of the housing 10 to the external environment in the event of thermal runaway of the cell 20, thereby forming a pressure relief channel (not shown) for continuous gas outflow.

[0043] Understandably, when the battery cell 20 experiences thermal runaway, it will generate high-temperature gases and burning particles, such as the melted outer casing and internal materials of the battery cell 20. The explosion-proof valve 30 connects the interior of the outer casing 10 with the external environment and forms a pressure relief channel, through which the gas containing burning particles is continuously discharged to the external environment.

[0044] By setting the explosion-proof valve 30, the gas containing combustion particles generated by the battery cell 20 can be discharged in time, which helps to reduce the risk of damage or explosion of the casing 10 due to excessive internal pressure, and improves the safety of the battery pack 100.

[0045] It should be noted that the explosion-proof valve 30 can be a metal spring return valve, a non-metallic explosion-proof valve 30, or a vent valve, etc. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0046] Please refer to the following: Figures 1 to 3 In some embodiments, the battery pack 100 further includes a flame arrester 40. The flame arrester 40 includes a mounting base 41 and a flame-arresting plate 42. The mounting base 41 is configured to fit into the housing 10 and is at least partially housed within the housing 10.

[0047] In some embodiments, the mounting base 41 is provided with a snap-fit ​​(not shown), and the outer shell 10 is provided with a slot (not shown). The snap-fit ​​and the slot engage to allow the mounting base 41 to be fitted into the outer shell 10. In other embodiments, other suitable mounting structures may be used, and this application does not limit them. Those skilled in the art can choose according to the actual situation.

[0048] In some embodiments, the mounting base 41 has a mounting hole 411, which is configured to communicate with the interior of the housing 10 and be positioned opposite to the explosion-proof valve 30. Specifically, the explosion-proof valve 30 is located on the opposite side of the flame arrestor 42 (the side facing the interior of the housing 11, or the side away from the interior of the housing) and overlaps with the flame arrestor 42, allowing burning particles to flow through the flame arrestor 42 and the explosion-proof valve 30 in the event of thermal runaway of the battery cell 20.

[0049] The flame arrestor plate 42 is installed in the mounting hole 411 and configured to fit against the explosion-proof valve 30. The flame arrestor plate 42 is constructed with a loose porous structure, and the pores in the flame arrestor plate 42 are not larger than the quenching diameter of the flame generated by the battery cell 20 in the event of thermal runaway.

[0050] The aforementioned quenching diameter specifically refers to the maximum diameter of the channel that can quench the flame. For example, NCM (nickel-cobalt-manganese) cell 20 and LFP (lithium iron phosphate) cell 20 mainly produce carbon monoxide and hydrogen gas during thermal runaway. The flame quenching diameter generated by the combustion ejecta composed of carbon monoxide, hydrogen gas, and combustion particles is 0.86 mm.

[0051] Understandably, when the battery cell 20 experiences thermal runaway, gas carrying burning particles surges through the explosion-proof valve 30 to the flame arrester 40. At this time, the high-temperature gas can pass through the pores in the flame arrestor plate 42 and flow into the external environment. However, the burning particles mixed in with the high-temperature gas are intercepted by the flame arrestor plate 42 and retained within the flame arrester 40 (i.e., filtering the burning particles in the high-temperature gas). Simultaneously, the flame arrestor plate 42 and the mounting base 41 absorb the heat of the burning particles retained within the flame arrester 40 through their own structure, reducing the temperature of the burning particles to below ignition temperature, thereby hindering the spread of flames generated by the burning ejecta.

[0052] By setting the flame arrester 40, the battery pack 100 can be effectively flame-arrested, reducing the risk of fire on the outside of the battery pack 100 caused by the ejection of flames or molten particles from inside the battery pack 100, thus helping to improve the safety of the battery pack 100.

[0053] The flame arrester 40 provided in this application consists of only two components: a mounting base 41 and a flame arresting plate 42, resulting in a simple structure. The mounting base 41 is fitted into the outer casing 10, and the flame arresting plate 42 is installed within the mounting hole 411 of the mounting base 41 and abuts against the explosion-proof valve 30. This "fitting + inner sleeve" installation method allows the flame arrester 40 to be more compact, reducing its overall size and facilitating the miniaturization design of the battery pack 100.

[0054] In addition, the mounting base 41 can serve as an adapter bracket. Production and installation personnel can design mounting bases 41 of different shapes according to specific installation conditions (such as curved or irregular surfaces). This helps to improve the versatility of the flame arrester 40 while ensuring that the flame arrester 40 has a small volume, adapt to different installation conditions, and make the installation process of the flame arrester 40 more flexible and fault-tolerant.

[0055] In some embodiments, the size of the pores in the flame arrestor 42 is defined as D1, and the quenching diameter of the flame generated by the battery cell 20 during thermal runaway is defined as D2, where D1 = 1 / 2 * D2. By introducing a safety factor of 0.5, the flame arrestor 42 can be ensured to have better structural strength, thereby ensuring the safety of the flame arrester 40 under extreme operating conditions.

[0056] Understandably, when the combustible gas mixture (such as carbon monoxide and hydrogen) generated by the thermal runaway of the battery cell 20 is ignited, the flame propagation will generate extremely strong shock waves and extremely high pressure. Due to the sharp increase in pressure difference, the flame arrestor 42 is prone to deformation or breakage under the action of shock waves and extremely high pressure, resulting in damage and failure of the entire flame arrestor 40.

[0057] By introducing an installation coefficient of 0.5, the size of the pores in the flame arrestor plate 42 can be reduced from the original quenching diameter. Because the pore size of the flame arrestor plate 42 decreases, the base portion of the flame arrestor plate 42 will increase, thereby increasing the overall structural strength of the flame arrestor plate 42. This helps to improve the compressive strength of the flame arrestor plate 42 and reduce the risk of its failure.

[0058] In some embodiments, the size of the pores in the flame arrestor 42 is 0.4 mm to 0.6 mm. For example, for an NCM (nickel-cobalt-manganese) battery cell 20 or an LFP (lithium iron phosphate) battery cell 20, the quenching diameter of the flame generated during thermal runaway is D2, which is 0.86 mm. Therefore, the size of the pores in the flame arrestor 42 is D1 = 1 / 2 * 0.86 = 0.43 mm.

[0059] In other embodiments, the pores of the flame arrestor 42 may also be of other sizes. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0060] In some embodiments, the flame arrestor 42 is configured to be formed by hot pressing multiple layers of metal wire mesh, wherein the mesh openings in the multiple layers of metal wire mesh together form pores.

[0061] By "stacked and hot-pressed multi-layer metal mesh", a flame-arresting sheet 42 with a "pancake-like structure" can be formed. The flame-arresting sheet 42 is more compact and has finer pores, which can better reduce the volume of the flame-arresting sheet 42 while ensuring that the flame arrester 40 has a better flame-arresting effect, which helps to reduce the size of the battery pack 100.

[0062] In some embodiments, the mesh count of the multilayer metal mesh is different, and the mesh count gradually increases along the direction of flame propagation, with the pores gradually narrowing. When the battery cell 20 experiences thermal runaway, the flame arrestor 42 first performs a preliminary sieve (filtering larger burning particles) and then a fine sieve (filtering smaller burning particles).

[0063] By setting the "gradually narrowing" pores, a layered filtration of burning particles can be achieved. This not only helps reduce the risk of burning particles clogging the flame arrestor plate 42, but also helps improve the interception rate of burning particles by the flame arrestor plate 42, thereby better improving the flame arrestor effect of the flame arrestor 40 and reducing the risk of burning particles surging to the outside of the battery pack 100 casing 10.

[0064] In some embodiments, the mesh count difference between two adjacent layers of metal wire mesh is ≥50 meshes. By setting the mesh count difference between two adjacent metal meshes to be no less than 50 meshes, the turbulence intensity of the flame between metal meshes of different mesh counts can be increased, thereby accelerating the energy dissipation of the flame and improving the flame-retardant effect of the flame arrestor plate 42.

[0065] For example, when a flame enters a 120-mesh metal mesh from a 60-mesh metal mesh, the mesh aperture decreases sharply, the turbulence intensity of the flame between the 60-mesh and 120-mesh metal mesh increases, and the energy dissipation of the flame accelerates.

[0066] In some embodiments, the flame arrestor sheet 42 is configured to be composed of multiple layers of corrugated stainless steel sheets, wherein the corrugated peaks and valleys of the multiple layers of corrugated stainless steel sheets overlap to form pores.

[0067] The flame arrestor sheet 42, which is made of multiple layers of corrugated stainless steel sheets, has better structural strength, and the stainless steel sheets can quickly absorb the heat of burning particles, which helps to improve the flame arrestor effect of the flame arrestor sheet 42.

[0068] For example, the fire-arresting sheet 42 is circular in shape. The fire-arresting sheet 42 is formed by alternating winding of corrugated sheet material and flat sheet material along the radial direction of the fire-arresting sheet 42 on the central axis of the fire-arresting sheet 42, forming a plurality of triangular holes.

[0069] In some embodiments, the fire-retardant sheet 42 is constructed from powder sintering, with the powder forming interconnected pores. The fire-retardant sheet 42 formed from powder sintering has a "one-piece structure" with no internal connection points and has better structural strength and corrosion resistance, which helps to extend the service life of the fire-retardant sheet 42.

[0070] It should be noted that the powder mentioned above can be a metal powder (such as brass powder) or a non-metal powder (such as ceramic powder). This application does not limit the type of powder, and those skilled in the art can choose according to the actual situation.

[0071] Please refer to the following: Figures 1 to 3 In some embodiments, the flame arrester 40 further includes an end cap 43, which is connected to the housing 10 and covers the mounting base 41, the flame arresting plate 42, and the explosion-proof valve 30. The end cap 43 has densely arranged through holes 431, which are configured to allow gas to pass through.

[0072] By setting the end cap 43, the risk of the flame arrester 42 being blocked due to external contaminants (such as dust, fallen leaves, etc.) entering the pores of the flame arrester 42 can be reduced, which helps to ensure the stable operation of the flame arrester 40 and extend the service life of the flame arrester 40.

[0073] It should be noted that the aforementioned dense arrangement specifically refers to the design of the vias 431 in a high-density, tightly arranged manner within a certain area, that is, the number of vias 431 per unit area is higher than that of conventional designs. For example, the end cap 43 has 20 vias 431 with a diameter of 0.2 mm (spaced 0.3 mm) within a 1 cm² area.

[0074] In other embodiments, the number and arrangement of vias 431 may also be different, and this application does not limit them. Those skilled in the art can choose according to the actual situation.

[0075] In some embodiments, an assembly gap 44 is formed between the flame arrestor plate 42 and the end cap 43 along the direction of flame propagation. The assembly gap 44 is smaller than the pores in the flame arrestor plate 42. When the flame arrestor plate 42 expands due to heat, the assembly gap 44 can provide a certain deformation space for the flame arrestor plate 42, which can prevent the flame arrestor plate 42 from being jammed by the rigid end cap 43 due to expansion, causing wrinkling deformation and resulting in an increase in the pore size of the flame arrestor plate 42, ultimately leading to flame arrestor failure.

[0076] When cell 20 experiences thermal runaway, the gas containing burning particles first flows through flame arrestor 42, which filters the burning particles through its own pores. The filtered high-temperature gas first flows into assembly gap 44 to reduce the flow rate, and then flows to the external environment through through hole 431 in end cap 43.

[0077] By reserving an assembly gap 44 between the flame arrestor plate 42 and the end cap 43, not only can the risk of the flame arrestor plate 42 failing due to thermal expansion be reduced, but also a buffer space can be provided for the flame, reducing the risk of the end cap 43 exploding due to violent spraying.

[0078] Please refer to the following: Figures 1 to 3 In some embodiments, the pores in the flame arrestor 42 at least partially overlap with the via 431 along the direction of flame propagation. Understandably, when thermal runaway occurs in the battery cell 20, the high-temperature gas can flow directly and smoothly out of the external environment along the via 431.

[0079] By setting the pores in the flame arrestor plate 42 to at least partially overlap with the through hole 431, the flow resistance of high-temperature gas can be reduced, thereby reducing the risk of the flame arrestor 40 exploding due to excessive airflow resistance, which is conducive to improving the safety of the battery pack 100.

[0080] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A flame arrester configured to be installed in a battery pack, the battery pack including a housing, a cell located inside the housing, and a burst valve capable of communicating the inside of the housing and an external environment when the cell is in thermal runaway, characterized in that, The flame arrester includes: The flame arrestor is constructed with a loose and porous structure, and the pores in the flame arrestor are not larger than the quenching diameter of the flame generated by the battery cell during thermal runaway. The mounting base is configured to fit into the housing and is at least partially housed inside the housing; the mounting base has a mounting hole configured to communicate with the interior of the housing and to be opposite to the explosion-proof valve; the flame arrestor is installed in the mounting hole and configured to fit against the explosion-proof valve.

2. The flame arrestor of claim 1, wherein The size of the pores in the flame arrestor is defined as D1, and the quenching diameter of the flame generated by the battery cell during thermal runaway is defined as D2, where D1 = 1 / 2 * D2.

3. The flame arrestor of claim 2, wherein, The size of the pores in the flame arrestor is 0.4mm to 0.6mm.

4. The flame arrestor of any one of claims 1 to 3, wherein, The flame arrestor is constructed by hot pressing multiple layers of metal wire mesh, with the mesh openings in the multiple layers of metal wire mesh forming the pores.

5. The flame arrestor of claim 4, wherein The mesh counts of the multiple layers of metal wire mesh are different, and the mesh count of the multiple layers of metal wire mesh gradually increases along the direction of flame spread, and the pores are gradually narrowed.

6. The flame arrestor of claim 5, wherein The mesh count difference between two adjacent layers of the metal wire mesh is ≥50 mesh.

7. The flame arrestor of claim 1, wherein The flame arrester also includes an end cap, which is configured to connect to the housing and cover the mounting base, the flame arrestor plate, and the explosion-proof valve. The end cap has densely arranged through holes, which are configured to allow gas to pass through.

8. The flame arrestor of claim 7, wherein, Along the direction of flame propagation, an assembly gap is formed between the flame arrestor and the end cap, and the assembly gap is smaller than the pores in the flame arrestor.

9. The flame arrestor of claim 7, wherein, Along the direction of flame propagation, the pores in the flame arrestor plate at least partially coincide with the through holes.

10. A battery pack, characterized by, include: shell; The battery cell is installed inside the housing; An explosion-proof valve is installed in the housing and configured to connect the interior of the housing to the external environment in the event of thermal runaway of the battery cell; The flame arrester according to any one of claims 1 to 9, wherein the mounting base is fitted into the housing and is at least partially housed inside the housing, and the flame arrestor is mounted on the mounting base and abuts against the explosion-proof valve.

11. An energy storage device, characterized by, It includes a device body and a battery pack as described in claim 10, wherein the battery pack is mounted on the device body.

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