Anti-overflow flame-retardant device of electric energy storage equipment

Abstract

The utility model provides an anti-spilling flame-retardant device of electric energy storage equipment. The anti-spilling flame-retardant device comprises a shell and an anti-spilling unit, an inner cavity is formed in the shell and used for containing the secondary battery, and the shell is provided with an exhaust port communicated with the inner cavity and the outside of the shell. The anti-spilling unit is arranged between the exhaust port and the secondary battery in the inner cavity, and comprises a zigzag flame-retardant flow channel and a flame-retardant expansion material arranged in the flame-retardant flow channel; according to the application, flames and high-temperature gas generated by thermal runaway of the secondary battery can be guided to the exhaust port, and heat of the flames and the high-temperature gas is consumed through the zigzag flame-retardant flow channel and the flame-retardant expansion material, so that further damage caused by open fire is avoided; and fly ash or powder generated by the flame-retardant expansion material is prevented from overflowing to the environment to cause secondary pollution and endangering human health.

Description

Technical Field

[0001] This application relates to a fire prevention device for secondary batteries, in particular to an anti-overflow fire retardant device for electrical energy storage devices. Background Art

[0002] Secondary cells, also known as rechargeable batteries, and one of the typical secondary cells is the lithium-ion battery. Due to its advantages such as fast charging, high energy density, small size, and mature technology, it has been widely used in various electronic products and electric vehicles. In order to provide and store more electrical energy, multiple battery cores of secondary batteries are further connected and combined in parallel or series to form a battery module, and then multiple battery modules and their related battery management systems (BMS) and cooling devices are combined into a battery pack. For example, a Tesla electric vehicle has approximately 10,000 battery cores. In addition to the well-known electric vehicles, secondary batteries are also widely used in battery energy storage systems (BESS) configured in server cabinets and electric locomotives.

[0003] However, due to the high chemical activity of "lithium", there are also considerable risks, and news of lithium-ion battery fires is not uncommon. Especially the recent multiple cases of electric vehicle fires and the difficulty in extinguishing them have made people pay more attention to the safety of lithium-ion batteries. It is known that thermal runaway is one of the main factors causing lithium-ion battery fires. Lithium-ion battery thermal runaway is caused by the heat generation rate of the internal short circuit of the battery being much higher than the heat dissipation rate, and a large amount of heat accumulates without being dissipated in time. And the changes caused when the temperature increases further increase the temperature, resulting in a vicious thermal cycle and spread. The thermal runaway of lithium-ion batteries will trigger a series of irreversible chain reactions, and the internal temperature will rise rapidly within a few milliseconds. The energy stored in the lithium-ion battery is suddenly released, resulting in a high temperature of approximately 500°C to 1000°C inside and accompanied by flames. At the same time, some materials in the lithium-ion battery form combustible high-temperature gas due to the high temperature and spray out to release pressure and overflow. Due to the overflow of open flames and high temperatures, it is almost impossible to extinguish the fire in a conventional way.

[0004] In the publicly disclosed Taiwan, China invention patent with patent certificate number I807750, an anti-overflow fire electronic device is proposed, which includes a housing, an electronic component, and a thermal expansion structure. A pair of ventilation openings are provided on the housing. The electronic component is accommodated in the housing, and at least a part of the electronic component is spaced from the housing, and a flow channel is formed between the electronic component and the inner wall of the housing, and the flow channel communicates with the ventilation openings. The thermal expansion structure covers the inner surface of the housing or the outer surface of the electronic component. When the thermal expansion structure is heated above a predetermined temperature, it can expand to block the flow channel.

[0005] For the aforementioned patented technology, although the characteristics of the thermal expansion structure expanding after being heated can be used to block the flow channel, thereby hindering the air convection inside the housing to reduce the entry of external combustion-supporting gases into the housing and avoid the generation of flames inside the housing; however, the thermal runaway of the battery may start from a local area. Isolating the thermal runaway area from the area where thermal runaway has not occurred, or quickly guiding the flame or high-temperature gas to be discharged can reduce the damage caused by thermal runaway more quickly and effectively. Summary of the Utility Model

[0006] The technical problem to be solved by this application is to provide an anti-overflow fire and flame retardant device for an electrical energy storage device, which can quickly discharge the flames and high-temperature gases generated by the secondary battery due to thermal runaway, and avoid further damage caused by flames or open fires.

[0007] To solve the above technical problems, this application proposes an anti-overflow fire and flame retardant device for an electrical energy storage device, which is used to accommodate a secondary battery therein, and is applicable to a battery energy storage cabinet of a server, an energy cabinet of a power system, and an explosion-proof cabinet of a secondary battery.

[0008] The structure of a preferred embodiment of the anti-overflow fire and flame retardant device for the electrical energy storage device of this application includes:

[0009] A housing, an inner cavity is formed inside the housing, the secondary battery is arranged in the inner cavity, and the housing has an exhaust port communicating the inner cavity and the outside of the housing; and

[0010] An anti-overflow fire unit, which is arranged in the inner cavity between the exhaust port and the secondary battery. The anti-overflow fire unit has a zigzag flame retardant flow channel. The two ends of the flame retardant flow channel are respectively communicated with the inner cavity and the exhaust port. The flames or high-temperature gases generated by the secondary battery need to pass through the flame retardant flow channel before they can be discharged from the exhaust port. The flame retardant flow channel is composed of at least one flame retardant partition. The flame retardant partition is composed of a flame retardant expansion material and at least one air flow hole penetrating the flame retardant partition. The flame retardant expansion material can start to expand when heated above the default temperature to close the flame retardant flow channel.

[0011] As a preferred embodiment of the anti-overflow and fire-retardant device of the electric energy storage device of the present application, it further includes: a filter screen, which is arranged in the inner cavity between the exhaust port and the anti-overflow fire unit. The filter screen is made of a metal mesh or a heat-resistant material, and the mesh size of the filter screen is 3 to 10 meshes.

[0012] As a preferred embodiment, the anti-overflow fire unit is composed of a first fire-retardant partition and a second fire-retardant partition. The first fire-retardant partition and the second fire-retardant partition are between the secondary battery and the exhaust port. In the direction from the secondary battery to the exhaust port, they are the first fire-retardant partition and the second fire-retardant partition in sequence. The second fire-retardant partition is arranged at intervals between the first fire-retardant partition and the exhaust port, thereby forming a zigzag fire-retardant flow channel between the first fire-retardant partition and the exhaust port; the first fire-retardant partition has a first air flow hole through which flames or high-temperature gases can pass through and enter the fire-retardant flow channel, and the second fire-retardant partition has a second air flow hole through which flames or high-temperature gases can pass through and go to the exhaust port. The projection position of the second air flow hole deviates from that of the first air flow hole.

[0013] As a preferred embodiment, the anti-overflow fire unit is composed of a third fire-retardant partition and at least one flow-dividing partition; the third fire-retardant partition is between the exhaust port and the secondary battery to form a fire-retardant space between the exhaust port and the third fire-retardant partition. The flow-dividing partitions are arranged at intervals along the horizontal direction in the fire-retardant space to form a plurality of parallel fire-retardant flow channels in the fire-retardant space. The third fire-retardant partition has a third air flow hole connecting the inner cavity and the fire-retardant space. Flames or high-temperature gases enter the plurality of fire-retardant flow channels in the fire-retardant space along the first flow direction through the third air flow hole, and the flames or high-temperature gases in the plurality of fire-retardant flow channels are discharged from the outer shell through the exhaust port along the second flow direction, where the first flow direction and the second flow direction intersect.

[0014] As a preferred embodiment, the fire-retardant partition is composed of a plate member and a fire-retardant expansion material attached to the surface of the plate member.

[0015] As a preferred embodiment, the flow-dividing partition is composed of a plate member and a fire-retardant expansion material attached to the surface of the plate member.

[0016] As a preferred embodiment, the fire-retardant expansion material is attached to the surface of the plate member by spraying or brushing.

[0017] As a preferred embodiment, the fire-retardant expansion material is attached to a sticker and then attached to the surface of the plate member through the sticker.

[0018] As a preferred embodiment, the fire-retardant partition is made of the fire-retardant expansion material.

[0019] As a preferred embodiment, the flow-dividing partition is made of the fire-retardant expansion material.

[0020] As a preferred embodiment, flame-retardant and expandable materials are disposed at intervals along the flow direction of the flame or high-temperature gas toward the exhaust port on the inner wall surface of the housing, and a flow guiding path is formed between any two adjacent flame-retardant and expandable materials.

[0021] As a preferred embodiment, the flame-retardant and expandable materials are attached to the inner wall surface of the housing by spraying or brushing.

[0022] As a preferred embodiment, the flame-retardant and expandable materials are attached to a sticker, and then the sticker is attached to the inner wall surface of the housing.

[0023] As a preferred embodiment, the ratio of the thickness of the flame-retardant and expandable materials to the maximum width of the flame-retardant flow path is 1:10 to 1:30.

[0024] The details of other effects and embodiments of the present application are described below in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a structural diagram of the first embodiment of the anti-overflow fire-retardant device of the electric energy storage device of the present application;

[0027] Figure 2 is Figure 1 a structural exploded view of the embodiment of;

[0028] Figure 3 is Figure 1 a partial structural exploded view of the embodiment of;

[0029] Figure 4 is Figure 1 a schematic cross-sectional structure diagram at the A-A position;

[0030] Figure 5 is a schematic operation diagram of the first embodiment of the present application;

[0031] Figure 6 is a structural exploded view of the second embodiment of the present application;

[0032] Figure 7 is Figure 6 a cross-sectional structure diagram of the embodiment of;

[0033] Figure 8It is a schematic structural diagram of another preferred embodiment of the flame-retardant partition board of the present application;

[0034] Figure 9 It is a structural diagram of the third embodiment of the anti-overflow fire and flame-retardant device of the electric energy storage device of the present application;

[0035] Figure 10 It is Figure 9 The structural exploded view of the embodiment of;

[0036] Figure 11 It is Figure 9 The schematic cross-sectional structure diagram at the B-B position;

[0037] Figure 12 It is a schematic diagram of the operation of the third embodiment of the anti-overflow fire unit shown from the top view of the housing;

[0038] Figure 13 It is a schematic cross-sectional structure diagram of a usage example of the third embodiment of the present application.

[0039] Symbol description

[0040] 10: Housing 11: Exhaust port

[0041] 20: Anti-overflow fire unit 21: First flame-retardant partition board

[0042] 211: First air flow through hole 22: Second flame-retardant partition board

[0043] 221: Second air flow through hole 23: Third flame-retardant partition board

[0044] 231: Third air flow through hole 24, 25: Shunt partition board

[0045] 30: Filter screen 40: Exhaust fan

[0046] 41: Energy storage controller 50: Plastic outer frame

[0047] B: Secondary battery C: Inner cavity

[0048] D1: First flow direction D2: Second flow direction

[0049] M, M1: Flame-retardant expansion material P: Flame-retardant flow channel

[0050] S: Plate t: Thickness

[0051] W: Width V: Flame-retardant space Detailed implementation manners

[0052] In the following implementation manners, the positional relationships described include: up, down, left, and right. Unless otherwise specified, they are all based on the directions in which the components are shown in the drawings.

[0053] First, please refer to Figure 1 and Figure 2 , which are the structural diagram and the structural decomposition diagram of the first embodiment of the anti-overflow fire and flame retardant device for the electric energy storage device of the present application. The anti-overflow fire and flame retardant device for the electric energy storage device of the present application is used to accommodate the secondary battery B (see Figure 4 ), and is applicable to battery energy storage cabinets of servers, energy cabinets of power systems, and explosion-proof cabinets of secondary batteries.

[0054] The structure of the first embodiment of the present application includes: a housing 10 and an anti-overflow fire unit 20 (see Figure 3 ). An inner cavity C is formed inside the housing 10, and the secondary battery B is disposed in the inner cavity C. The housing 10 has an exhaust port 11, and the number of exhaust ports 11 is at least one. In other embodiments, the number of exhaust ports 11 is multiple, and the shape of the exhaust port 11 is not limited, including round holes or long strip holes. Preferably, it is arranged in an array. The exhaust port 11 communicates the inner cavity C with the outside of the housing 10. The housing 10 is basically a rectangular shell, and its shape can be determined according to applications and uses. The material of the housing 10 is made of heat-resistant and fire-proof materials. Preferably, it is made of a metal plate. One embodiment of the housing 10 is completed by combining multiple metal plates.

[0055] The functions of the anti-overflow fire unit 20 include guiding the flames and high-temperature gases generated by the secondary battery due to thermal runaway to the exhaust port 11, consuming the heat of the flames and high-temperature gases, and preventing further damage caused by flames or open fires. The anti-overflow fire unit 20 is disposed in the inner cavity C and between the exhaust port 11 and the secondary battery B (see Figure 4 ). The anti-overflow fire unit 20 has a zigzag flame retardant flow channel P (shown by the dotted arrows in Figure 4 ). The two ends of the flame retardant flow channel P communicate with the inner cavity C and the exhaust port 11 respectively, so as to guide the flames or high-temperature gases generated by the secondary battery B to be discharged from the exhaust port 11 of the housing 10. That is, the flames or high-temperature gases generated by the secondary battery B due to thermal runaway need to pass through the flame retardant flow channel before being discharged from the exhaust port. The flame retardant flow channel P is defined by at least one flame retardant partition. The flame retardant partition is basically composed of a flame retardant expansion material M and at least one air flow hole penetrating the flame retardant partition. Specific preferred embodiments will be described later; please refer to Figure 5 , the flame retardant expansion material M can start to expand when the heat reaches above the default temperature, thereby closing the flame retardant flow channel P. Through the zigzag flame retardant flow channel P and the flame retardant expansion material M, the heat of the flames and high-temperature gases can be extended and consumed.

[0056] Please refer to Figures 1 to 5, which shows the structure of the first preferred embodiment of the anti-overflow fire unit 20; the anti-overflow fire unit 20 is composed of a first flame retardant partition 21 and a second flame retardant partition 22. The first flame retardant partition 21 and the second flame retardant partition 22 are located between the secondary battery B and the exhaust port 11. In the direction from the secondary battery B to the exhaust port 11, the first flame retardant partition 21 and the second flame retardant partition 22 are arranged in sequence. The second flame retardant partition 22 is arranged at intervals between the first flame retardant partition 21 and the exhaust port 11, thereby forming a zigzag flame retardant flow path P between the first flame retardant partition 21 and the exhaust port 11.

[0057] The first flame retardant partition 21 has a first air flow hole 211 through which the flame or high-temperature gas generated by the secondary battery can pass and enter the flame retardant flow path P. The second flame retardant partition 22 has a second air flow hole 221 through which the flame or high-temperature gas can pass and go to the exhaust port 11. The projection position of the second air flow hole 221 deviates from that of the first air flow hole 211. For example, the first air flow hole 211 is arranged in the upper half area of the first flame retardant partition 21, and the second air flow hole 221 is arranged in the lower half area of the second flame retardant partition 22. After the flame or high-temperature gas passes through the first air flow hole 211, it makes the first turn under the guidance of the second flame retardant partition 22 and enters the flame retardant flow path P, and then makes the second turn and passes through the second air flow hole 221 to go to the exhaust port 11 (as shown by the dotted arrow in Figure 4 ).

[0058] Another preferred embodiment structure of the anti-overflow fire and flame retardant device of the electric energy storage device of the present application includes a filter screen 30 (see Figure 3 ). The filter screen 30 is arranged in the inner cavity C between the exhaust port 11 and the anti-overflow fire unit 20 (see Figure 4 ) to block the fly ash and powder generated after the flame retardant expansion material M absorbs heat and expands. The filter screen 30 is made of a metal mesh or a heat-resistant material. Preferably, the mesh of the filter screen 30 is between 3 and 10 meshes.

[0059] There are several preferred implementation manners of the flame retardant partition, which are described as follows. Please refer to Figure 2 , the first preferred implementation manner of the flame retardant partition is composed of a plate member S and a flame retardant expansion material M attached to the surface of the plate member S (see Figure 2 ); in one implementation manner, the flame retardant expansion material M is attached to the surface of the plate member S by spraying or brushing; in another implementation manner, the flame retardant expansion material M is attached to a sticker, and then the sticker is attached to the surface of the plate member S. In the Figures 1 to 5 shown embodiment structure, a flame retardant expansion material M is arranged on the side of the first flame retardant partition 21 facing the secondary battery B. Preferably, the flame retardant expansion material M is arranged in an area avoiding the first air flow hole 211 (see Figure 3 and Figure 4); A fire-retardant expansion material M is disposed on the side of the second fire-retardant partition 22 facing the first fire-retardant partition 21. Preferably, the fire-retardant expansion material M is disposed in an area avoiding the second air flow through-hole 221 (see Figure 3 and Figure 4 ).

[0060] When the fire-retardant expansion material M is heated to a temperature above the default temperature, it can expand up to 15 times at most. Preferably, the ratio of the thickness t of the fire-retardant expansion material M to the maximum width W of the fire-retardant flow channel P (see Figure 4 ) is 1:10 to 1:30. For example, a 0.6-mm-thick fire-retardant expansion material M can expand to a thickness of about 6 - 18 mm. As a preferred embodiment of the present application, the thickness of the fire-retardant expansion material M is 0.6 mm, and the distance between the first fire-retardant partition 21 and the second fire-retardant partition 22 is 8 mm, that is, the width of the fire-retardant flow channel P is 8 mm.

[0061] Please refer to Figure 6 and Figure 7 , which shows the second preferred embodiment structure of the anti-overflow fire unit 20. The difference between the second preferred embodiment of the anti-overflow fire unit 20 and the first preferred embodiment shown in Figures 1 to 5 is that in addition to the different configuration directions of the anti-overflow fire unit 20 in the inner cavity C, the second preferred implementation of the fire-retardant partition (including the first fire-retardant partition 21 and the second fire-retardant partition 22) is directly made of the fire-retardant expansion material M. Please refer to Figure 8 , which shows the third preferred implementation of the fire-retardant partition, in which the fire-retardant expansion material M and a plastic outer frame 50 are integrally formed into the fire-retardant partition.

[0062] In a preferred embodiment of the present application, fire-retardant expansion materials M1 are disposed at intervals along the flow direction of the flame or high-temperature gas towards the exhaust port 11 on the inner side wall surface of the outer shell 10, and a diversion path is formed between any two adjacent fire-retardant expansion materials M1. As shown in the embodiments illustrated in Figure 3 , Figure 6 and Figure 10 , a plurality of fire-retardant expansion materials M1 arranged at intervals are disposed along the flow direction of the flame or high-temperature gas on the inner side surface of the top of the outer shell 10. The diversion path formed between any two adjacent fire-retardant expansion materials M1 can better guide the flame or high-temperature gas towards the exhaust port 11.

[0063] Please refer to Figure 9 and Figure 10, is the structural diagram and its structural decomposition diagram of another embodiment of the present application. The third preferred embodiment structure of the anti-overflow fire unit 20 is shown, which is composed of a third flame retardant partition 23 and at least two flow diversion partitions 24, 25. A flame retardant expansion material M is disposed on the surfaces of the third flame retardant partition 23 and the two flow diversion partitions 24, 25; the third flame retardant partition 23 is located between the exhaust port 11 and the secondary battery B, so as to form a flame retardant space V between the exhaust port 11 and the third flame retardant partition 23 (see Figure 11 and Figure 12 ). The third flame retardant partition 23 has a third air flow through hole 231 for communicating the inner cavity C and the flame retardant space V; please refer to Figure 12 . In a preferred embodiment, the flame or high-temperature gas enters the flame retardant space V through the third air flow through hole 231 along the first flow direction D1, and the flame or high-temperature gas in the flame retardant space V is discharged from the housing 10 through the exhaust port 11 along the second flow direction D2, where the first flow direction D1 and the second flow direction D2 intersect, and the flame or high-temperature gas generated by the secondary battery B will make a turn when passing through the third air flow through hole 231 and then be discharged from the exhaust port 11 of the housing; the two flow diversion partitions 24, 25 are arranged at intervals in the flame retardant space V to form a plurality of mutually parallel flame retardant flow channels P in the flame retardant space V, and the flame or high-temperature gas entering the flame retardant space V through the third air flow through hole 231 can be discharged from the housing 10 through the exhaust port 11 after passing through the plurality of flame retardant flow channels P.

[0064] Please refer to Figure 13 . According to the use of the present application, such as a battery energy storage cabinet of a server, an energy cabinet of a power system or an explosion-proof cabinet of a secondary battery, a plurality of flame retardant flow channels P formed in the flame retardant space V can be respectively provided with, for example, an exhaust fan 40 and an energy storage controller 41.

[0065] As another preferred embodiment of the present application, a flame retardant expansion material M is also disposed on the inner side wall surface of the housing 10, and preferably, the flame retardant expansion material M is disposed on the inner side wall surface of the housing 10 and surrounds the exhaust port 11 (see Figure 2 and Figure 4 ).

[0066] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing the technology of the present application, and do not impose any formal restrictions on the implementation manners of the technology of the present application. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present application, may make some changes or modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present application in essence.

Claims

1. A fire retardant device for electric energy storage equipment, used to accommodate secondary batteries in Among them, it is characterized in that The structure of the anti-overflow fire retardant device of the electric energy storage device includes: A shell, an inner cavity is formed inside the shell, the secondary battery is arranged in the inner cavity, and the shell has an exhaust port connecting the inner cavity and the outside of the shell; as well as A fire prevention unit is arranged in the inner cavity between the exhaust port and the secondary battery, and the fire prevention unit has a zigzag flame retardant flow channel, and the two ends of the flame retardant flow channel are respectively connected to the inner cavity and the exhaust port. The flame or high-temperature gas generated by the secondary battery needs to pass through the flame retardant flow channel before it can be discharged from the exhaust port. The flame retardant flow channel is composed of at least one flame retardant partition, and the flame retardant partition is composed of a flame retardant expansion material and at least one air flow hole passing through the flame retardant partition. The flame retardant expansion material can begin to expand when it encounters heat and reaches a temperature above a default temperature, thereby closing the flame retardant flow channel.

2. The anti-overflow flame retardant device for electric energy storage equipment according to claim 1, characterized in that: It also includes: a filter screen, which is arranged in the inner cavity between the exhaust port and the anti-overflow unit, and is made of a metal mesh or a heat-resistant material, and has a mesh size of 3 to 10.

3. The anti-overflow flame retardant device for electric energy storage equipment according to claim 1, characterized in that: The anti-overflow unit is composed of a first flame-retardant baffle and a second flame-retardant baffle, the first flame-retardant baffle and the second flame-retardant baffle are between the secondary battery and the exhaust port, and the first flame-retardant baffle and the second flame-retardant baffle are in sequence from the secondary battery to the exhaust port, the second flame-retardant baffle is arranged between the first flame-retardant baffle and the exhaust port to form a tortuous flame-retardant flow channel between the first flame-retardant baffle and the exhaust port; the first flame-retardant baffle has a first air flow hole for flames or high-temperature gases to pass through and enter the flame-retardant flow channel, and the second flame-retardant baffle has a second air flow hole for flames or high-temperature gases to pass through and go to the exhaust port, and the second air flow hole deviates from the projection position of the first air flow hole.

4. The anti-overflow flame retardant device for electric energy storage equipment according to claim 1, characterized in that: The anti-overflow unit is composed of a third flame-retardant baffle and at least one diversion baffle; the third flame-retardant baffle is located between the exhaust port and the secondary battery to form a flame-retardant space between the exhaust port and the third flame-retardant baffle, the diversion baffle is arranged in the flame-retardant space at intervals along the horizontal direction, and a plurality of flame-retardant flow channels parallel to each other are formed in the flame-retardant space, the third flame-retardant baffle has a third air flow hole connecting the inner cavity and the flame-retardant space, the flame or high-temperature gas enters the plurality of flame-retardant flow channels in the flame-retardant space through the third air flow hole along a first flow direction, and the flame or high-temperature gas in the plurality of flame-retardant flow channels is discharged from the outer shell through the exhaust port along a second flow direction, wherein the first flow direction and the second flow direction intersect.

5. The anti-overflow flame retardant device for electric energy storage equipment according to claim 3 or 4, characterized in that: The flame retardant partition is composed of a plate and the flame retardant expansion material attached to the surface of the plate.

6. The anti-overflow flame retardant device for electric energy storage equipment according to claim 5, characterized in that: The flame retardant expansion material is attached to the surface of the plate by spraying or brushing.

7. The anti-overflow flame retardant device for electric energy storage equipment according to claim 5, characterized in that: The flame retardant expansion material is attached to a sticker and then attached to the surface of the board through the sticker.

8. The anti-overflow flame retardant device for electric energy storage equipment according to claim 3 or 4, characterized in that: The flame retardant partition is made of the flame retardant expansion material.

9. The anti-overflow flame retardant device for electric energy storage equipment according to claim 4, characterized in that: The flow dividing plate is composed of a plate and the flame retardant expansion material attached to the surface of the plate.

10. The anti-overflow flame retardant device for electric energy storage equipment according to claim 9, characterized in that: The flame retardant expansion material is attached to the surface of the plate by spraying or brushing.

11. The anti-overflow fire retardant device for electric energy storage equipment according to claim 9, characterized in that: The flame retardant expansion material is attached to a sticker and then attached to the surface of the board through the sticker.

12. The anti-overflow flame retardant device for electric energy storage equipment according to claim 9, characterized in that: The flow dividing baffle is made of the flame retardant expansion material.

13. The anti-overflow fire retardant device for electric energy storage equipment according to claim 1, characterized in that: The flame retardant expansion materials are arranged at intervals on the inner wall surface of the shell along the flow direction of the flame or high-temperature gas toward the exhaust port, and a guide path is formed between any two adjacent flame retardant expansion materials.

14. The anti-overflow fire retardant device for electric energy storage equipment according to claim 13, characterized in that: The flame retardant expansion material is attached to the inner wall surface of the shell by spraying or brushing.

15. The anti-overflow fire retardant device for electric energy storage equipment according to claim 13, characterized in that: The flame retardant expansion material is attached to a sticker and then attached to the inner wall surface of the shell through the sticker.

16. The anti-overflow fire retardant device for electric energy storage equipment according to claim 1, characterized in that: The ratio of the thickness of the flame retardant expansion material to the maximum width of the flame retardant flow channel is 1:10 to 1:30.

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