Fire-fighting device and energy storage equipment

Abstract

The utility model provides a fire-fighting device and energy storage equipment, the fire-fighting device is applied to a battery cell of the energy storage equipment, the fire-fighting device comprises a fire-fighting main body and a thermosensitive wire group, and the fire-fighting main body is used for spraying a fire extinguishing agent to the battery cell; the thermosensitive wire set comprises a thermosensitive agent, a containing sleeve and a fireproof sleeve, the thermosensitive agent is located in the containing sleeve, the containing sleeve is connected with the fire-fighting main body, the fireproof sleeve is arranged on the containing sleeve in a sleeving mode, and the fireproof sleeve wraps the end, away from the fire-fighting main body, of the containing sleeve; wherein a heat reduction layer is arranged between the fireproof sleeve and the accommodating sleeve, and the heat reduction layer is configured to reduce heat transferred to the thermosensitive medicament, so that the temperature of the thermosensitive medicament is below the ignition temperature before the battery cell generates open fire. The above arrangement can improve the problem that the thermosensitive lead of the fire-fighting device is ignited in advance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery fire safety, and in particular to a fire-fighting device and an energy storage device. BACKGROUND

[0002] The energy storage device includes a battery, and a fire-fighting device is usually arranged inside a battery compartment of the battery. When a thermal runaway fire occurs in a battery cell in the battery, the fire-fighting device can be triggered in time, so as to effectively extinguish the battery cell and prevent the fire from spreading.

[0003] In the related art, the fire-fighting device is usually triggered by a heat-sensitive lead. The heat-sensitive lead usually includes a plastic tube and a heat-sensitive agent. The heat-sensitive agent is arranged in the plastic tube. The ignition point of the heat-sensitive lead is generally about 170±10°C. At this temperature, the heat-sensitive agent in the plastic tube will burn, so that the fire extinguishing core group in the fire-fighting device is triggered to spray fire extinguishing agent for extinguishing fire.

[0004] When the above fire-fighting device is applied to a battery, it is found that during the process in which the explosion-proof valve of the battery cell sprays flammable gas but the flammable gas has not yet lost control and caught fire, the temperature inside the battery rises. The heat-sensitive lead of the fire-fighting device is ignited in advance when the battery has not yet caught fire, so that the fire-fighting device sprays fire extinguishing agent. When the battery cell actually catches fire, the fire-fighting device has failed, resulting in the fire-fighting device being unable to effectively extinguish fire. SUMMARY

[0005] Therefore, the present application provides a fire-fighting device and an energy storage device, which can improve the problem that the heat-sensitive lead of the fire-fighting device is ignited in advance and cannot effectively extinguish fire.

[0006] According to one aspect of the present application, an embodiment of the present application provides a fire-fighting device applied to a battery cell of an energy storage device. The fire-fighting device includes a fire-fighting body and a heat-sensitive lead group. The fire-fighting body is used to spray fire extinguishing agent to the battery cell. The heat-sensitive lead group includes a heat-sensitive agent, a containing sleeve, and a fireproof sleeve. The heat-sensitive agent is located in the containing sleeve. The containing sleeve is connected to the fire-fighting body. The fireproof sleeve is sleeved on the containing sleeve. The fireproof sleeve wraps an end of the containing sleeve away from the fire-fighting body. A heat reduction layer is arranged between the fireproof sleeve and the containing sleeve. The heat reduction layer is configured to reduce the heat transferred to the heat-sensitive agent, so that the temperature of the heat-sensitive agent is below the ignition point temperature before the battery cell produces an open flame. In the above embodiment, the heat reduction layer can reduce the heat transferred from the battery cell to the heat-sensitive agent, thereby improving the problem that the heat-sensitive agent is ignited in advance and improving the reliability of the fire-fighting device in extinguishing the battery cell.

[0007] In at least one embodiment, the heat reduction layer includes an air thermal insulation layer. The air thermal insulation layer is formed between the inner wall surface of the fireproof sleeve and the outer wall surface of the containing sleeve.

[0008] In the above embodiment, by arranging the air insulation layer, heat can be reduced when the battery sprays the valve, so that the temperature of the heat-sensitive agent is below the ignition temperature before the battery produces an open flame.

[0009] In at least one embodiment, the air insulation layer is internally filled with inert gas.

[0010] In the above embodiment, the thermal conductivity of the inert gas is low, which can reduce heat transfer.

[0011] In at least one embodiment, the distance between the inner wall surface of the fireproof sleeve and the outer wall surface of the containing sleeve is in the range of 0.5mm to 1mm.

[0012] In the above embodiment, during the actual use of the fire-fighting device, the temperature when the battery sprays the valve is 200℃, and the ignition temperature of the heat-sensitive agent is 170℃. By setting the distance between the inner wall surface of the fireproof sleeve and the outer wall surface of the containing sleeve to be in the range of 0.5mm to 1mm, the thermal conductivity of the air insulation layer can be in an appropriate range, thereby improving the problem of premature combustion of the heat-sensitive agent after the battery sprays the valve.

[0013] In at least one embodiment, the heat-sensitive wire group further comprises a limiting piece connected to the fireproof sleeve and the containing sleeve to limit the position between the fireproof sleeve and the containing sleeve.

[0014] In the above embodiment, by arranging the limiting piece, the position between the fireproof sleeve and the containing sleeve can be limited, so that the connection between the containing sleeve and the fireproof sleeve is stable.

[0015] In at least one embodiment, the limiting piece comprises a limiting plate, the fireproof sleeve has an opening, the limiting plate is arranged on the opening and fixedly connected with the fireproof sleeve, and the inner side of the limiting plate is connected with the end of the containing sleeve.

[0016] In the above embodiment, the limiting plate can not only limit the containing sleeve and improve the connection stability between the containing sleeve and the fireproof sleeve, but also will not affect other positions between the fireproof sleeve and the containing sleeve, so that the heat reduction layer between the circumferential inner wall of the fireproof sleeve and the circumferential outer wall of the containing sleeve is uniformly distributed, and the consistency of the heat reduction effect of the heat reduction layer in each direction of the fireproof sleeve is improved.

[0017] In at least one embodiment, the limiting member includes a plurality of limiting protrusions, which are arranged at intervals along the length direction of the fireproof sleeve, and the plurality of limiting protrusions are all arranged between the fireproof sleeve and the receiving sleeve, and are respectively connected to the receiving sleeve and the fireproof sleeve, and the plurality of limiting protrusions are all made of thermal insulation material; or, the limiting member includes a limiting cylinder, which is sleeved on the receiving sleeve and respectively abuts the receiving sleeve and the fireproof sleeve, and the two ends of the limiting cylinder in the length direction are respectively flush with the two ends of the receiving sleeve in the length direction, and the limiting cylinder is made of thermal insulation material.

[0018] In the above embodiment, the connection strength between the accommodating sleeve and the fireproof sleeve can be ensured by setting a plurality of limiting protrusions. Through the above setting of the limiting cylinder, the contact area between the limiting member and the accommodating sleeve and the contact area between the limiting member and the fireproof sleeve are improved, thereby improving the connection reliability and stability between the limiting member, the accommodating sleeve and the fireproof sleeve. The limiting cylinder is made of a heat-insulating material, so that the limiting cylinder can form a heat reduction layer. In this way, the heat reduction layer can reduce temperatures greater than 200°C, and the two ends of the limiting cylinder in the length direction are respectively arranged flush with the two ends of the accommodating sleeve in the length direction, which can improve the consistency of the heat reduction effect of the heat reduction layer in all directions around the fireproof sleeve.

[0019] In at least one embodiment, the material of the limiting plate is the same as the material of the fireproof sleeve; and / or the material of the fireproof sleeve is glass fiber.

[0020] In the above embodiment, the material of the limiting plate is the same as that of the fireproof sleeve, which can ensure the heat reduction effect in all directions; by setting the fireproof sleeve to glass fiber, the glass fiber has a certain heat reduction effect, and combined with the setting of the heat reduction layer, the heat reduction effect can be improved.

[0021] In at least one embodiment, the limiting plate and the accommodating sleeve are connected by bonding with a heat-insulating adhesive.

[0022] In the above embodiment, the adhesive can be prevented from melting before the heat-sensitive agent burns, thereby ensuring the connection strength between the accommodating sleeve and the fireproof sleeve.

[0023] According to another aspect of the present application, an energy storage device is provided, comprising: the above-mentioned fire-fighting device and an energy storage body, the energy storage body comprising a shell and a battery cell, and the battery cell and the fire-fighting device are both arranged in the shell.

[0024] In the above embodiment, by applying the fire-fighting device to the energy storage device, the temperature of the heat-sensitive agent is prevented from reaching the ignition temperature before the battery cell generates an open flame. This prevents the heat-sensitive agent from igniting prematurely, ensures that the fire-fighting device can effectively extinguish the battery cell fire, and improves the reliability of the fire-fighting device in extinguishing the battery cell fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope.

[0026] Figure 1 A perspective view of an embodiment of the energy storage device of the present application is provided.

[0027] Figure 2 An exploded view of the energy storage device of the present application is provided. Figure 1

[0028] Figure 3 A perspective view of an embodiment of the fire-fighting device of the present application is provided.

[0029] Figure 4 A sectional view of the thermal sensitive wire group of the fire-fighting device of the present application is provided.

[0030] Figure 5 An exploded view of the fire-fighting device of the present application is provided. Figure 3

[0031] A structural schematic view of the limiting plate of the fire-fighting device of the present application is provided. Figure 6

[0032] A structural schematic view of the limiting protrusion of the fire-fighting device of the present application is provided. Figure 7 Main element symbol explanation

[0033] 100-fire-fighting device 210-heat reduction layer 240-limiting plate

[0034] 10-fire-fighting body 220-sealing cap 200-energy storage device

[0035] 20-thermal sensitive wire group 230-opening 30-energy storage body

[0036] 21-thermal sensitive agent 221-sleeve body 31-electricity core

[0037] 22-containing sleeve 24-limiting member 32-housing

[0038] 23-fireproof sleeve 241-limiting protrusion

[0039] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0040] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0041] ​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] In the related art, when the explosion-proof valve of the battery cell sprays out flammable gas but the flammable gas has not yet gotten out of control and caught fire, the temperature inside the battery rises, and the heat-sensitive lead of the fire-fighting device will be ignited in advance before the battery cell catches fire, thereby triggering the fire-fighting device to spray fire-extinguishing mist. However, when the battery cell actually catches fire, the fire-fighting device has failed, resulting in the fire-fighting device being unable to effectively extinguish the fire.

[0043] An embodiment of the present application provides a fire-fighting device, which is applied to the battery cells of energy storage equipment. The heat-sensitive wire group of the fire-fighting device includes a heat-sensitive agent, a containing sleeve and a fire-proof sleeve. A heat reduction layer is provided between the fire-proof sleeve and the containing sleeve, so that when the battery cell sprays a valve, the heat transferred to the heat-sensitive agent is reduced by the heat reduction layer, thereby preventing the temperature of the heat-sensitive agent from reaching the ignition temperature before the battery cell generates an open flame.

[0044] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0045] See Figure 1 and Figure 2 , an embodiment of the present application provides a fire-fighting device 100 and an energy storage device 200 .

[0046] See also Figure 1 In some embodiments, energy storage device 200 has both storage and discharge capabilities, enabling applications such as home backup power, production facility backup power, and outdoor work and recreation. Energy storage device 200 can be a small portable power bank, household energy storage power supply, industrial and commercial energy storage power supply, or containerized energy storage power supply. The battery cells 31 of energy storage device 200 include ternary lithium cells, lithium iron phosphate cells, lithium cobalt oxide cells, and nickel-metal hydride cells.

[0047] See also Figure 1 and Figure 2 In some embodiments, when the energy storage device 200 experiences thermal runaway and generates an open flame, the fire-fighting device 100 is used to spray a fire extinguishing agent onto the battery cells 31 of the energy storage device 200 , thereby effectively extinguishing the fire on the battery cells and preventing the fire from spreading.

[0048] See also Figure 2 and Figure 3The fire-fighting device 100 comprises a fire-fighting main body 10 and a heat-sensitive wire set 20. The fire-fighting main body 10 is used to spray fire extinguishing agent on the battery cell 31. The heat-sensitive wire set 20 reaches the ignition point, and the combustion of the heat-sensitive wire set 20 can introduce sparks into the fire-fighting main body 10 to trigger the fire-fighting main body 10 to spray out the fire extinguishing agent.

[0049] Please refer to Figure 3 and Figure 4 The heat-sensitive wire set 20 comprises a heat-sensitive agent 21, a containing sleeve 22, and a fireproof sleeve 23. The heat-sensitive agent 21 is located in the containing sleeve 22, and the combustion of the heat-sensitive agent 21 is used to trigger the fire-fighting main body 10 to spray out the fire extinguishing agent. The containing sleeve 22 is connected with the fire-fighting main body 10 and is used to contain the heat-sensitive agent 21 to prevent the heat-sensitive agent from being damp and leaking. The fireproof sleeve 23 is sleeved on the containing sleeve 22 and can prevent the sparks generated by the combustion of the heat-sensitive agent 21 from further igniting the combustible gas in the external environment. The fireproof sleeve 23 wraps the end of the containing sleeve 22 away from the fire-fighting main body 10. A heat reduction layer 210 is arranged between the fireproof sleeve 23 and the containing sleeve 22. The heat reduction layer 210 is configured to reduce the heat transferred to the heat-sensitive agent 21, so that the temperature of the heat-sensitive agent 21 is below the ignition point temperature before the battery cell 31 produces an open flame. In this way, the problem of the heat-sensitive agent 21 being ignited in advance can be improved, and the reliability of the fire-fighting device in extinguishing the battery cell can be improved.

[0050] It should be noted that when the battery cell produces an open flame, the temperature of the open flame is relatively high. Even if the heat passes through the heat reduction layer 210, the heat transferred to the heat-sensitive agent 21 can still cause the heat-sensitive agent 21 to reach its ignition point temperature, thereby igniting the heat-sensitive agent 21 and causing the fire-fighting main body 10 to spray out the fire extinguishing agent for extinguishing. For example, the temperature of the battery cell 31 when producing an open flame can be 800°C. After the heat passes through the fireproof sleeve 23, the heat reduction layer 210, and the containing sleeve 22, the heat is reduced to 300°C. That is, the temperature of the heat transferred to the heat-sensitive agent 21 is 300°C, which is higher than the ignition point temperature of the heat-sensitive agent 21 (170°C), thereby igniting the heat-sensitive agent 21 and causing the fire-fighting main body 10 to spray out the fire extinguishing agent for extinguishing.

[0051] In some embodiments, an air heat insulation layer is formed between the inner wall surface of the fireproof sleeve 23 and the outer wall surface of the containing sleeve 22, and the air heat insulation layer is the heat reduction layer 210. By arranging the air heat insulation layer, the reduction of heat can be achieved when the battery cell sprays out, so that the temperature of the heat-sensitive agent 21 is below the ignition point temperature before the battery cell 31 produces an open flame.

[0052] In some embodiments, inert gas is introduced into the air heat insulation layer. In this way, the thermal conductivity of the inert gas is low, and the transfer of heat can be reduced.

[0053] Optionally, the inert gas includes one or more of neon, argon and helium, and the specific inert gas type and capacity can be determined according to the type of the battery cell.

[0054] In some embodiments, the distance between the inner wall surface of the fireproof sleeve 23 and the outer wall surface of the containing sleeve 22 is in the range of 0.5mm to 1mm. In actual use of the fire extinguishing device 100, the temperature of the battery cell 31 when the valve is sprayed is 200℃, and the ignition point of the heat-sensitive agent is 170℃. By setting the distance between the inner wall surface of the fireproof sleeve 23 and the outer wall surface of the containing sleeve 22 in the range of 0.5mm to 1mm, the thermal conductivity of the air insulation layer can be kept in an appropriate range, thereby further improving the problem of premature combustion of the heat-sensitive agent after the battery cell 31 is sprayed.

[0055] The specific distance between the inner wall surface of the fireproof sleeve 23 and the outer wall surface of the containing sleeve 22 can be adjusted according to the different spray temperatures of different battery cells 31. The specific distance can be adjusted to a value at which the heat-sensitive agent does not burn prematurely. For example, according to different types and capacities of battery cells, the distance between the inner wall surface of the fireproof sleeve 23 and the outer wall surface of the containing sleeve 22 can be 0.3mm to 0.5mm, or 1mm to 1.5mm, etc.

[0056] Referring to Figure 5 , the containing sleeve 22 has a sealed space, and the heat-sensitive agent 21 is arranged in the sealed space.

[0057] In some embodiments, the containing sleeve 22 includes a sealing cap 220 and a sleeve body 221, and the sealing cap 220 is sleeved on the sleeve body 221 and is sealingly connected with the sleeve body 221 to form a sealed space. In this way, the effects of preventing the heat-sensitive agent from being damp and preventing the heat-sensitive agent from leaking can be achieved.

[0058] In some embodiments, the containing sleeve 22 is made of a plastic material, and the sealing cap 220 is made of a rubber material. The rubber material has a certain elastic force, so that the sealing effect between the sealing cap 220 and the containing sleeve 22 is good, thereby improving the effects of preventing the heat-sensitive agent from being damp and preventing the heat-sensitive agent from leaking.

[0059] In some embodiments, referring to Figure 6 and Figure 7 , the heat-sensitive wire group 20 further includes a limiting piece 24 connected with the fireproof sleeve 23 and the containing sleeve 22 respectively to limit the position between the fireproof sleeve 23 and the containing sleeve 22. Through the arrangement of the limiting piece 24, the position between the fireproof sleeve 23 and the containing sleeve 22 can be limited, so that the fireproof sleeve 23 and the containing sleeve 22 are relatively fixed, thereby stabilizing the connection between the containing sleeve and the fireproof sleeve 23.

[0060] Exemplarily, the limiting member 24 is bonded with the containing sleeve and the fireproof sleeve respectively; or, the limiting member 24 is welded with the containing sleeve and the fireproof sleeve respectively.

[0061] In some embodiments, referring to Figure 3 and Figure 6 , the limiting member 24 comprises a limiting plate 240, the fireproof sleeve 23 has an opening 230, the limiting plate 240 covers the opening 230 and is fixedly connected with the fireproof sleeve 23, and the inner side of the limiting plate 240 is connected with the end of the containing sleeve 22. In this way, the limiting member 24 can limit the containing sleeve 22, improve the connection stability between the containing sleeve 22 and the fireproof sleeve 23, and will not affect other positions between the fireproof sleeve 23 and the containing sleeve 22, so that the heat reduction layer 210 between the circumferential inner side wall of the fireproof sleeve 23 and the circumferential outer side wall of the containing sleeve 22 is uniformly distributed, and the consistency of the heat reduction effect of the heat reduction layer 210 in each direction of the fireproof sleeve 23 is improved.

[0062] When the heat reduction layer 210 comprises an air heat insulation layer, the connection of the inner side of the limiting plate 240 with the end of the containing sleeve 22 can improve the consistency of the heat reduction effect of the air heat insulation layer in each direction of the fireproof sleeve 23.

[0063] In some embodiments, the material of the limiting plate 240 is the same as the material of the fireproof sleeve 23, so that the heat reduction layer 210 can also be formed between the end of the containing sleeve 22 and the limiting plate 240, to improve the heat reduction effect of the heat-sensitive medicament in each direction.

[0064] In some embodiments, the limiting plate 240 is connected with the containing sleeve 22 by heat-insulating adhesive. In this way, the adhesive can be prevented from melting before the heat-sensitive medicament is burned, so as to ensure the connection strength between the containing sleeve 22 and the fireproof sleeve 23. Moreover, the heat-insulating adhesive can form the heat reduction layer 210, so that the heat-insulating adhesive plays a role in heat reduction.

[0065] In some embodiments, the material of the fireproof sleeve 23 is glass fiber. By setting the fireproof sleeve 23 as glass fiber, the glass fiber has a certain heat reduction effect, and in combination with the setting of the heat reduction layer 210, the heat reduction effect can be improved.

[0066] In some embodiments, referring to Figure 7The limiting member 24 comprises a plurality of limiting protrusions 241, which are arranged at intervals along the length direction of the fireproof sleeve 23, are arranged between the fireproof sleeve 23 and the containing sleeve 22, and are connected to the containing sleeve 22 and the fireproof sleeve 23, respectively. The limiting protrusions 241 are made of heat insulation material, so that the limiting protrusions 241 and the air heat insulation layer form the heat reduction layer 210 together to ensure the heat reduction effect. In addition, the connection strength between the containing sleeve 22 and the fireproof sleeve 23 can be ensured by arranging the plurality of limiting protrusions 241.

[0067] In some embodiments, the plurality of limiting protrusions 241 are divided into a plurality of limiting groups, and each limiting group comprises at least one limiting protrusion 241.

[0068] Optionally, each limiting group comprises one limiting protrusion 241, and the limiting protrusion 241 has a ring structure and surrounds the containing sleeve 22. In this way, the containing sleeve 22 and the fireproof sleeve 23 can be coaxially arranged, and the inner wall surface of the fireproof sleeve and the outer wall surface of the containing sleeve are arranged at equal distances, thereby improving the consistency of the heat reduction effect of the air heat insulation layer in each direction of the circumferential direction of the fireproof sleeve 23.

[0069] Optionally, each limiting group comprises a plurality of limiting protrusions 241, and the plurality of limiting protrusions 241 of each limiting group are arranged at intervals around the containing sleeve 22. In this way, the containing sleeve 22 and the fireproof sleeve 23 can be coaxially arranged, and the inner wall surface of the fireproof sleeve and the outer wall surface of the containing sleeve are arranged at equal distances, thereby improving the consistency of the heat reduction effect of the air heat insulation layer in each direction of the circumferential direction of the fireproof sleeve 23.

[0070] For example, the two ends of the limiting protrusion 241 abut against the containing sleeve 22 and the fireproof sleeve 23, respectively.

[0071] In some embodiments, the limiting member 24 is a limiting cylinder, which is sleeved on the containing sleeve 22 and abuts against the containing sleeve 22 and the fireproof sleeve 23, respectively, and the two ends of the limiting cylinder in the length direction are arranged flush with the two ends of the containing sleeve 22 in the length direction. Through the above arrangement of the limiting cylinder, the contact area between the limiting member 24 and the containing sleeve 22 and the contact area between the limiting member 24 and the fireproof sleeve 23 are improved, thereby improving the connection reliability and stability among the limiting member 24, the containing sleeve 22 and the fireproof sleeve 23.

[0072] In some embodiments, the limiting cylinder is made of a heat-insulating material. In this way, the limiting cylinder forms the heat reduction layer 210, so that the heat reduction layer 210 can reduce the temperature greater than 200℃, and the length direction of the two ends of the limiting cylinder is respectively flush with the length direction of the two ends of the accommodating sleeve 22, which can improve the consistency of the heat reduction effect of the heat reduction layer 210 in each direction of the circumferential direction of the fireproof sleeve 23.

[0073] Please refer to Figure 1 and Figure 2 In some embodiments, the energy storage device 200 includes the fire extinguishing device 100 and an energy storage body 30, the energy storage body 30 includes a shell 32 and an electric core 31, and the electric core 31 and the fire extinguishing device 100 are both arranged in the shell 32.

[0074] By applying the above fire extinguishing device 100 to the energy storage device 200, the temperature of the heat-sensitive agent 21 can be prevented from reaching the ignition temperature in advance before the electric core 31 produces an open flame. In this way, the heat-sensitive agent 21 can be prevented from igniting in advance, ensuring that the fire extinguishing device can effectively extinguish the electric core, and improving the reliability of the fire extinguishing device for extinguishing the electric core.

[0075] It should be noted that when an element is referred to as being "fixedly connected" to another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. When an element is referred to as being "arranged on" another element, it can be directly arranged on the other element or there can be a middle element.

[0076] The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0077] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application, and any appropriate changes and variations to the above embodiments within the spirit and scope of the present application are within the scope of the present application.

Claims

1. A fire-fighting device, applied to a battery cell of an energy storage device, characterized in that: The fire-fighting device comprises: a fire-fighting body, the fire-fighting body being used to spray a fire-extinguishing agent onto the battery cell; A heat-sensitive wire assembly, comprising a heat-sensitive agent, a containing sleeve, and a fireproof sleeve, wherein the heat-sensitive agent is located in the containing sleeve, the containing sleeve is connected to the fire-fighting body, and the fireproof sleeve is sleeved on the containing sleeve, and the fireproof sleeve wraps the end of the containing sleeve away from the fire-fighting body; A heat reduction layer is provided between the fireproof sleeve and the containing sleeve, and the heat reduction layer is configured to reduce the heat transferred to the heat-sensitive agent so that the temperature of the heat-sensitive agent is below the ignition temperature before the battery core generates an open flame.

2. The fire fighting device according to claim 1, wherein: The heat reduction layer includes an air insulation layer, and the air insulation layer is formed between the inner wall surface of the fireproof sleeve and the outer wall surface of the accommodating sleeve.

3. The fire fighting device according to claim 2, wherein: Inert gas is introduced into the air insulation layer.

4. The fire fighting device according to claim 2, wherein: The distance between the inner wall surface of the fireproof sleeve and the outer wall surface of the accommodating sleeve ranges from 0.5 mm to 1 mm.

5. The fire fighting device according to claim 1, wherein: The thermal line assembly further includes: A limiting member is connected to the fireproof sleeve and the accommodating sleeve respectively to limit the position between the fireproof sleeve and the accommodating sleeve.

6. The fire fighting device according to claim 5, characterized in that: The limiting member includes a limiting plate. The fireproof sleeve has an opening. The limiting plate covers the opening and is fixedly connected to the fireproof sleeve. The inner side of the limiting plate is connected to the end of the accommodating sleeve.

7. The fire fighting device according to claim 5, characterized in that: The limiting member includes a plurality of limiting protrusions, which are arranged at intervals along the length direction of the fireproof sleeve, and the plurality of limiting protrusions are arranged between the fireproof sleeve and the accommodating sleeve, and respectively connect the accommodating sleeve and the fireproof sleeve, and the plurality of limiting protrusions are made of heat-insulating material; or, The limiting member includes a limiting cylinder, which is sleeved on the accommodating sleeve and respectively abuts the accommodating sleeve and the fireproof sleeve. The two ends of the limiting cylinder in the length direction are respectively flush with the two ends of the accommodating sleeve in the length direction. The limiting cylinder is made of insulation material.

8. The fire fighting device according to claim 6, wherein: The material of the limiting plate is the same as that of the fireproof sleeve; and / or, The fireproof sleeve is made of glass fiber.

9. The fire fighting device according to claim 6, wherein: The limiting plate and the accommodating sleeve are connected by bonding with a heat-insulating adhesive.

10. An energy storage device, characterized in that: include: The fire-fighting device according to any one of claims 1 to 9; The energy storage body comprises a shell and a battery core, wherein the battery core and the fire-fighting device are both arranged in the shell.

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