CN219534787U - Fireproof structure, battery pack and power utilization device - Google Patents

Abstract

The utility model relates to a fireproof structure, a battery pack and an electric device. The fireproof structure is provided with a first surface and a second surface which are oppositely arranged, the first surface is provided with an exhaust channel, and the exhaust channel is used for facing the battery cell; the second surface is provided with a protruding portion along a direction deviating from the first surface, and the protruding portion is internally provided with an accommodating space for accommodating the flowable extinguishing medium. When the battery cell is in thermal runaway, high-temperature gas generated by the battery cell can be discharged along the exhaust channel, so that the phenomenon that the high-temperature gas is accumulated at the battery cell to cause the acceleration of the thermal runaway degree of the battery cell is reduced. If the thermal runaway degree of the battery core reaches the explosion state, the fireproof structure is destroyed, and the flowable extinguishing medium contained in the containing space flows out and covers the explosion part to isolate air, so that the fire is extinguished. The fireproof structure has a good fireproof effect, and the battery pack has high safety and reliability.

Description

Fireproof structure, battery pack and power utilization device

Technical Field

The utility model relates to the technical field of thermal runaway of batteries, in particular to a fireproof structure, a battery pack and an electric device.

Background

The electric automobile is a vehicle which uses a vehicle-mounted power supply as power and drives a vehicle body to move through electric power, and along with the improvement of environmental awareness of people, people tend to use the electric automobile to replace a fuel automobile.

The on-board power supply in an electric vehicle is typically a battery pack. A plurality of electric cores are arranged in the battery pack, and the electric automobile is powered through the electric cores. However, thermal runaway may occur in a single cell during operation of the cell. In the event of thermal runaway of a single cell, the passage may undergo "heat generation", "gas generation", "combustion", "explosion" phases. For the battery pack, after the single cell is thermally out of control, the heat diffusion is locally overheated, so that a plurality of cells are easily thermally out of control at the same time, and the result is aggravated.

In traditional battery packs, a fireproof structure is generally arranged at the top of the battery cell so as to isolate and insulate heat of the battery cell when the battery cell is out of control, and avoid the contact of the battery cell and other conductive parts in the battery pack. However, in the current fireproof structure, the impact resistance is weak, and the combustion and explosion stages in the thermal runaway of the battery cells are damaged due to the fact that the impact pressure cannot be resisted, so that the continuous fireproof cannot be realized.

Disclosure of Invention

Accordingly, it is necessary to provide a fire protection structure, a battery pack, and an electric device, which are directed to the problem that the fire protection structure cannot continuously prevent fire.

A fire protection structure having oppositely disposed first and second surfaces, the first surface having an exhaust passage disposed therein for facing a battery cell; the second surface is provided with a protruding portion along a direction deviating from the first surface, and the protruding portion is internally provided with an accommodating space for accommodating the flowable extinguishing medium.

In one embodiment, at least part of the protruding portion, the central region of the exhaust passage, and the explosion-proof valve of the battery cell are on the same straight line.

In one embodiment, the channel wall of the exhaust channel has a curved surface.

In one embodiment, the width of the first surface is W1, and the width of the battery cell is Wm, wherein Wm is less than or equal to W1 and less than or equal to 1.2Wm;

and/or the width of the exhaust channel is W2, and the width of the explosion-proof valve of the battery cell is W0, wherein W0 is less than or equal to W2;

and/or the width of the first surface is W1, and the width of the exhaust channel is W2, wherein W2 is less than or equal to 0.8W1.

In one embodiment, the fireproof structure comprises a first insulating member and a second insulating member which are connected, wherein the first surface is arranged on one side of the first insulating member away from the second insulating member, the second surface is arranged on one side of the second insulating member away from the first insulating member, and the protruding portion is arranged on the second insulating member.

In one embodiment, the second insulating member includes a flexible layer and a supporting layer, the accommodating space is disposed between the flexible layer and the supporting layer, and a side of the supporting layer facing away from the flexible layer is connected with the first insulating member.

In one embodiment, the height of the second insulating member is equal to or less than the height of the protruding portion in a direction from the first surface to the second surface.

A battery pack comprises a protective box, a battery cell arranged in the protective box and the fireproof structure; the battery cell is provided with an explosion-proof valve, the exhaust channel faces towards the explosion-proof valve, and the protruding part is propped against the inner wall of the protective box or is provided with a gap.

In one embodiment, the number of the electric cores is a plurality, at least two electric cores are electrically connected to form a battery module, and the number of the battery modules is at least one;

in one battery module, the explosion-proof valves of the battery cells are arranged in the same direction, the number of the fireproof structures is one, and the exhaust channel at least covers all the explosion-proof valves in the battery module.

In one embodiment, the protective housing is provided with a vent hole aligned with and in communication with the vent passage.

An electric device comprises the battery pack.

When the fireproof structure is used, when the electric core is in thermal runaway, high-temperature gas generated by the electric core can be discharged along the exhaust channel arranged on the second surface of the fireproof structure, so that the degree of the thermal runaway of the electric core is quickened due to the fact that the high-temperature gas is gathered at the electric core is reduced. When the thermal runaway of the battery cell reaches the explosion state, the generated flame may damage the fireproof structure. When the fireproof structure is damaged, the flowable fire extinguishing medium contained in the containing space flows out and covers the explosion part to isolate air, so that fire is extinguished. When the fireproof structure is used, the fireproof effect is good, and especially after the battery cell is in a burning explosion state and the fireproof structure is damaged, the fireproof structure can also achieve the effect of extinguishing fire, so that the fireproof grade of the fireproof structure is improved, and the safety performance of the battery pack is improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of a battery pack according to an embodiment of the present utility model.

Fig. 3 is an enlarged partial schematic view at a in fig. 1.

Fig. 4 is a partially enlarged schematic view at B in fig. 2.

Fig. 5 is a partially enlarged schematic cross-sectional view of another embodiment of the present utility model.

Fig. 6 is a partial schematic view of a battery pack according to an embodiment of the utility model.

Reference numerals illustrate:

010. a battery cell; 011. an explosion-proof valve;

020. a battery module;

030. a flowable extinguishing medium;

100. a fire protection structure; 101. a first surface; 102. a second surface; 110. a first insulating member; 111. an exhaust passage; 112. a channel wall; 120. a second insulating member; 121. a boss; 122. a flexible layer; 123. a support layer; 124. an accommodation space; 130. an insulating member;

200. a protective box; 210. a case; 211. an exhaust hole; 220. a cover body;

300. a fire protection pad.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1-5, one embodiment of the present utility model provides a fire protection structure 100 that includes a first surface 101 and a second surface 102 disposed opposite to each other. Wherein the first surface 101 is provided with an exhaust channel 111. The exhaust channel 111 may be oriented toward the cell 010. When the battery cell 010 is out of control, the high-temperature gas generated by the battery cell 010 can be discharged along the exhaust channel 111, so that the high-temperature gas is prevented from accumulating to accelerate the temperature rise of the battery cell 010, and the probability that the battery cell 010 enters the Cheng Ranbao state after the thermal runaway is reduced. The second surface 102 is provided with a protrusion 121 in a direction away from the first surface 101. The boss 121 has an accommodation space 124 therein. The receiving space 124 may receive the flowable fire-extinguishing medium 030. When the battery cell 010 enters the explosion state for a period of time, the fireproof structure 100 may be damaged, and the flowable fire-extinguishing medium 030 may flow out from the accommodating space 124 and cover the explosion place. The flowable fire extinguishing medium 030 can isolate air, cover flame at the explosion position, and reduce the influence of thermal runaway of the battery cell 010. In addition, since the flowable fire extinguishing medium 030 is disposed in the accommodating space 124, when the external structure impacts the battery cell 010, the protruding portion 121 can deform to buffer, thereby reducing the vibration of the battery cell 010 and improving the reliability.

In some embodiments, the flowable fire extinguishing medium 030 may be borax, sand-extinguishing agent, or other mixture, etc., and may be adjusted according to the actual situation. The flowable fire extinguishing medium 030 can cover the explosion position of the battery cell 010 to isolate air, so that fire can be extinguished.

In some embodiments, at least a portion of boss 121, a central region of vent passage 111, and explosion proof valve 011 of cell 010 are collinear. When the battery cell 010 is out of control, high temperature gas is discharged from the explosion-proof valve 011. The high-temperature gas is discharged by the explosion-proof valve 011 and is discharged through the exhaust passage 111. Since the height of the fire-preventing structure 100 along the first surface 101 to the second surface 102 is relatively small at the central region of the exhaust passage 111, the fire-preventing structure 100 therein is more easily broken by flames when burned than the fire-preventing structure 100 at the edge. When at least part of the protruding portion 121 and the central area of the exhaust channel 111 are on the same straight line, if the central area of the exhaust channel 111 is damaged by flame, the flowable fire extinguishing medium 030 can rapidly cover the explosion position of the battery core 010 and isolate air, so as to extinguish fire.

In the embodiment shown in fig. 1 to 5, the central region of the exhaust passage 111 is on the same line as the central region of the boss 121. Such an arrangement allows a large amount of flowable fire-extinguishing medium 030 to be rapidly covered from the destruction site to the explosion site of the cell 010 after the central region of the exhaust passage 111 is destroyed, thereby effectively extinguishing a fire.

In some embodiments, the channel wall 112 of the exhaust channel 111 has a curved surface. Along the length of the first surface 101, the curved surface may gradually approach the second surface 102 to a certain extent and gradually deviate from the second surface 102. The curved surface can enable the impact force of the dispersed gas on the fireproof structure 100 when the fireproof structure 100 is impacted by high-temperature gas, so that the deformation degree of the fireproof structure 100 is reduced, and the reliability of the fireproof structure 100 is improved.

It will be appreciated that in some embodiments, the channel wall 112 of the exhaust channel 111 may be wavy. By providing the wavy exhaust passage 111, it is possible to reduce the possibility that the fireproof structure 100 is deformed by impact while achieving rapid gas discharge, thereby improving the reliability of the fireproof structure 100. In other embodiments, the passage wall 112 of the exhaust passage 111 may have a semicircular shape or the like having a curved surface.

Referring to fig. 6, in some embodiments, the first surface 101 has a width W1 and the cell 010 has a width Wm. Wm is less than or equal to W1 and less than or equal to 1.2Wm. The width of the first surface 101 is slightly larger than the width of the battery cell 010, so that the battery cell 010 can be covered, and when the thermal runaway of the battery cell 010 is guaranteed, the fireproof structure 100 can block heat. The width of the fire-blocking structure 100 is not excessively large so that the volume of the battery pack can be reduced.

With continued reference to FIG. 6, in some embodiments, the width W2 of the vent passage 111 is greater than or equal to the width W0 of the explosion protection valve 011 of the cell 010, i.e., W0. Ltoreq.W2. When the battery cell 010 is in a thermal runaway state, high-temperature gas is ejected by the explosion-proof valve 011. Because the width W2 of the exhaust channel 111 is greater than or equal to the width W0 of the explosion-proof valve 011 of the battery cell 010, the high-temperature gas released by the explosion-proof valve 011 can be exhausted along the exhaust channel 111 at the first time, so that the situation that the high-temperature gas flows to other parts of the battery pack is reduced, and the occurrence probability of thermal runaway of other battery cells 010 in the battery pack is further reduced.

In some embodiments, the width of the exhaust channel 111 is 80% or less of the width of the first surface 101, i.e., W2. Ltoreq. 0.8W1. The height of the fire-preventing structure 100 is reduced and the fire-preventing effect is reduced due to the provision of the exhaust passage 111. And too wide an exhaust passage 111 may cause an increase in the range of high-temperature gas channeling. Therefore, the setting of W2 is less than or equal to 0.8W1 can realize that the probability of channeling of high-temperature gas towards the gas direction is reduced while the exhaust channel 111 is used for exhausting the high-temperature gas, so that the exhaust effect is ensured.

Referring to fig. 1-4, in some embodiments, the fire protection structure 100 includes a first insulating member 110 and a second insulating member 120 connected. The side of the first insulating member 110 remote from the second insulating member 120 has the aforementioned first surface 101. The second insulator 120 has the aforementioned second surface 102 on a side thereof remote from the first insulator 110. The second insulating member 120 is provided with a boss 121. When the cell 010 is thermally out of control, high-temperature gas may be discharged along the exhaust passage 111 provided in the first insulating member 110 when the cell 010 is in the "heat generation" or "gas generation" stage. If the cell 010 continues to undergo thermal runaway and reaches the "burn-in" or "explosion" phase, the cell 010 may burn through the first insulating member 110. The second insulating member 120 can also continuously block heat transmission at this time, thereby increasing the reliability of the fire protection device. When the temperature continues to rise, after the part of the accommodating space 124 formed by the second insulating member 120 burns out, the thermal runaway part of the battery core 010 is covered by the flowable fire extinguishing medium 030 in the accommodating space 124, which is beneficial to isolating air and extinguishing flame, thereby realizing fire prevention.

Referring to fig. 4 and 6, in some embodiments, the second insulating member 120 may include a flexible layer 122 and a supporting layer 123. Wherein the accommodation space 124 is provided between the flexible layer 122 and the supporting layer 123. The side of the support layer 123 facing away from the flexible layer 122 is connected to the first insulating member 110. The flowable fire-extinguishing medium 030 in the accommodating space 124 is supported by the supporting layer 123 so as to be held in the accommodating space 124. The arrangement of the flexible layer 122 can ensure that the protruding portion 121 can deform when receiving external force from one side of the flexible layer 122 so as to relieve vibration of the second insulating member 120 caused by the external force, and can relieve the external force transmitted to the cell 010 and reduce vibration of the cell 010.

In some embodiments, the flexible layer 122 may be a flexible layer made of glass fiber, mica paper, or PET. The flexible layer 122 made of the material has better tensile capacity, and can cover the flowing fire extinguishing medium 030 and ensure better impact resistance. The support layer 123 may be selected from mica sheets or PC sheet support layers. The supporting layer 123 may have a good supporting strength so as to provide a strong supporting force.

Referring to fig. 6, in some embodiments, the height H1 of the second insulating member 120 is less than or equal to the height H2 of the protruding portion 121 along the direction from the first surface 101 to the second surface 102. It is understood that the height H1 of the aforementioned second insulating member 120 refers to the height of the supporting layer 123. The height H2 of the protruding portion 121 refers to the height of the accommodating space 124 and the flexible layer 122. By the arrangement, the mobile fire-extinguishing medium 030 can be contained as much as possible, so that the battery cell 010 can have more mobile fire-extinguishing medium 030 for extinguishing fire at the explosion position when the explosion happens.

In some embodiments, the first insulator 110 and the second insulator 120 may be connected by adhesive. In some other embodiments, the first insulating member 110 and the second insulating member 120 may be connected in other ways, which may be changed according to practical situations.

It will be appreciated that in some other embodiments, as shown in fig. 5, the fire protection structure 100 includes only the insulator 130. One surface of the insulating member 130 is provided with the aforementioned exhaust passage 111, and the other surface is provided with the protruding portion 121 to achieve fire prevention of the battery cell 010.

In other embodiments, at least one third insulating member (not shown) may be further disposed between the first insulating member 110 and the second insulating member 120. The provision of the third insulating member may increase the fireproof effect of the fireproof structure 100. Especially, for some battery packs with higher fire-proof grades, the third insulating piece is additionally arranged, so that the battery packs can be ensured to be positioned at the higher fire-proof grades.

Referring to fig. 1-6, an embodiment of the present utility model provides a battery pack, which includes a protection box 200, a battery cell 010 disposed in the protection box 200, and the fireproof structure 100 according to any of the foregoing embodiments. Wherein, the battery core 010 is provided with an explosion-proof valve 011, and the exhaust passage 111 faces the explosion-proof valve 011. The protruding part 121 abuts against the inner wall of the protection box 200 or has a gap.

Referring to FIG. 6, in some embodiments, the distance between the second surface 102 where the protrusion 121 is not disposed and the inner wall of the protection box 200 is H0, and the height of the protrusion 121 is H2, where H2 is equal to or less than 1.1H0. Such an arrangement may allow for a smaller distance between the protrusion 121 and the inner wall of the protective housing 200, enabling the fire protection structure 100 to be located between the protective housing 200 and the electrical cell 010. When the protective case 200 vibrates, the protrusion 121 can relieve the impact of the vibration on the battery cell 010.

In some embodiments, as shown in fig. 1, the protective case 200 may include a case 210 and a cover 220. The case 210 may accommodate the battery cell 010 and the fireproof structure 100. The case 210 can be provided with the battery cell 010, and can isolate the battery cell 010 from the external environment to a certain extent, so that the influence of thermal runaway of the battery cell 010 on the external environment is reduced.

In the embodiment shown in fig. 1, the battery cell 010 may be disposed at the bottom of the case 210. The side of the cell 010 having the explosion-proof valve 011 faces the direction of the cover 220. After the cover 220 is covered with respect to the case 210, the battery cell 010 and the fireproof structure 100 are accommodated in the case 210.

In some embodiments, the side wall of the case 210 may be provided with the discharge hole 211. The exhaust holes 211 may exhaust the high temperature gas in the case 210, thereby lowering the temperature in the entire protection case 200 and controlling the degree of thermal runaway of the battery cell 010 to some extent.

In the embodiment shown in fig. 1, the discharge hole 211 is aligned with and communicates with the discharge passage 111. That is, when thermal runaway of the battery cell 010 occurs, the high-temperature gas may move to the exhaust hole 211 along the exhaust passage 111 and be discharged out of the protection case 200 through the exhaust hole 211. By the arrangement, high-temperature gas can be discharged rapidly, the retention time of the high-temperature gas in the box 210 is reduced, and further the retained high-temperature gas is effectively reduced to gather and influence other battery cells 010.

With continued reference to fig. 1, the number of cells 010 is a plurality. At least two cells 010 are electrically connected to form a battery module 020. The number of the battery modules 020 is at least one. In one battery module 020, the explosion-proof valves 011 of the respective battery cells 010 are provided in the same direction. The number of fire-protecting structures 100 may be one. The exhaust passage 111 covers at least all of the explosion-proof valves 011 in the battery module 020. Such an arrangement may allow all of the cells 010 within the battery module 020 to share one fire protection structure 100. Compared to the solution where each cell 010 is provided with one fire protection structure 100, there may be a gap between the fire protection structures 100 in one battery module 020. When the cell 010 located at the middle of the battery module 020 is thermally out of control, high temperature gas may be diffused to other positions of the case 210 from the aforementioned gap while moving along the exhaust passage 111, resulting in failure of even exhausting the high temperature gas. Therefore, the above-described solution can avoid the existence of a gap between the adjacent fireproof structures 100, so that the high-temperature gas can be rapidly discharged along the exhaust passage 111.

In some embodiments, a fire protection pad 300 may be disposed between any adjacent cells 010 within a set of battery modules 020. When a certain cell 010 is out of control, the fireproof pad 300 can prevent the adjacent cell 010 from being out of control to a certain extent, and the probability that the adjacent cell 010 is out of control together is reduced.

In some of these embodiments, the thickness of the fire protection mat 300 may be 1-3mm. The fireproof pad 300 with the thickness has a better fireproof effect, and occupies a smaller space in the battery pack.

In some embodiments, the size of the fire protection pad 300 is greater than the size of the abutment surface of an adjacent cell 010. The fireproof effect can be guaranteed through the arrangement, and the condition that thermal runaway occurs in the adjacent battery cells 010 is reduced.

In some embodiments, the number of fire-preventing structures 100 may be one in one battery module 020. The number of the exhaust passages 111 and the number of the protrusions 121 are one. By the arrangement, the high-temperature other fire-extinguishing medium can be discharged rapidly along the exhaust channel 111, the fire-extinguishing success rate can be increased by increasing the quantity of the fire-extinguishing medium 030 and the quantity of the fire-extinguishing medium 030 after the fire-extinguishing structure 100 is destroyed by flame, the fire-extinguishing medium 030 which is removed from the corresponding protruding part 121 at the flame can be covered at the flame, and the fire-extinguishing medium 030 which is positioned at the corresponding position of other electric core 010 can also flow to the flame.

It is understood that in some other embodiments, the number of fire-protecting structures 100 may be one in one battery module 020. The number of the exhaust channels 111 is one, and the number of the protruding parts 121 is the same as the number of the battery cells 010 and is set in a one-to-one correspondence. When the protruding portion 121 is broken, the flowable fire-extinguishing medium 030 contained in the protruding portion 121 may cover the corresponding cell 010.

In some embodiments, the number of the battery modules 020 in the battery pack may be plural, and the plural battery modules 020 may be arranged in parallel at intervals. Each battery module 020 may correspond to one fire-preventing structure 100. It is understood that in some other embodiments, all of the battery modules 020 may correspond to the same fire protection structure 100. The first surface 101 of the fire prevention structure 100 may be provided with a plurality of sets of exhaust passages 111 corresponding to the battery modules 020. The second surface 102 of the fireproof structure 100 may also be provided with a plurality of groups of protruding parts 121 corresponding to the battery modules 020, and the second surface 102 of the fireproof structure 100 may also be provided with only one protruding part 121, and the protruding part 121 covers all the battery cells 010 explosion-proof valves 011.

The battery pack has a good fireproof effect. When any cell 010 in the fire-proof structure is out of control, the fire-proof structure 100 can discharge high-temperature gas generated by the cell 010 and extinguish fire. In addition, in the normal use process, if the upper cover vibrates with respect to the battery cell 010, the protruding part 121 can buffer, so as to reduce the vibration received by the battery cell 010.

An embodiment of the present utility model provides an electrical device, including the battery pack according to any one of the embodiments. The electric device can be an electric automobile. Electric vehicles may include pure electric vehicles, hybrid electric vehicles. The battery pack may provide electrical energy to drive the powered device.

In the use process of the electricity utilization device, when the electric core 010 in the electricity utilization device is out of control, high-temperature gas can be discharged rapidly, the concentration of the high-temperature gas is reduced, the temperature of the electric core 010 is increased, and the first-layer fireproof protection is carried out. If the thermal runaway of the battery cell 010 is high, the fireproof structure 100 is damaged, and the flowable fire extinguishing medium 030 can overflow from the accommodating space 124 and cover the explosion position of the battery cell 010, so that air is isolated for extinguishing a fire. The electric device has better fireproof effect, can achieve higher safety performance and has stronger reliability.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (11)

1. A fire protection structure, characterized in that the fire protection structure is provided with a first surface and a second surface which are oppositely arranged, wherein the first surface is provided with an exhaust passage which is used for facing a battery cell; the second surface is provided with a protruding portion along a direction deviating from the first surface, and the protruding portion is internally provided with an accommodating space for accommodating the flowable extinguishing medium.

2. The fire protection structure according to claim 1, wherein at least part of the boss, a central region of the exhaust passage, and the explosion-proof valve of the battery cell are in a same line.

3. The fire protection structure according to claim 1, wherein the passage wall of the exhaust passage has a curved surface.

4. The fire protection structure according to claim 1, wherein the width of the first surface is W1, and the width of the battery cell is Wm, wm is less than or equal to W1 is less than or equal to 1.2Wm;

and/or the width of the exhaust channel is W2, and the width of the explosion-proof valve of the battery cell is W0, wherein W0 is less than or equal to W2;

and/or the width of the first surface is W1, and the width of the exhaust channel is W2, wherein W2 is less than or equal to 0.8W1.

5. The fire protection structure according to claim 1, wherein the fire protection structure includes a first insulating member and a second insulating member connected, the first insulating member having the first surface on a side thereof remote from the second insulating member, the second insulating member having the second surface on a side thereof remote from the first insulating member, the second insulating member being provided with the protruding portion.

6. The fire protection structure according to claim 5, wherein the second insulating member includes a flexible layer and a supporting layer, the accommodating space is provided between the flexible layer and the supporting layer, and a side of the supporting layer facing away from the flexible layer is connected to the first insulating member.

7. The fire protection structure according to claim 5, wherein a height of the second insulating member is equal to or less than a height of the protruding portion in a direction from the first surface to the second surface.

8. A battery pack, comprising a protective case, a battery cell arranged in the protective case, and the fireproof structure of any one of claims 1-7; the battery cell is provided with an explosion-proof valve, the exhaust channel faces towards the explosion-proof valve, and the protruding part is propped against the inner wall of the protective box or is provided with a gap.

9. The battery pack according to claim 8, wherein the number of the electric cells is plural, at least two of the electric cells are electrically connected to form a battery module, and the number of the battery modules is at least one;

in one battery module, the explosion-proof valves of the battery cells are arranged in the same direction, the number of the fireproof structures is one, and the exhaust channel at least covers all the explosion-proof valves in the battery module.

10. The battery pack of claim 8, wherein the protective case is provided with a vent hole aligned with and in communication with the vent channel.

11. An electrical device comprising a battery pack according to any one of claims 8-10.