Fire extinguishing device and battery

Abstract

The utility model provides a fire extinguishing device and a battery, the fire extinguishing device comprises a coating layer and a fire extinguishing agent, the coating layer is configured to be arranged in a battery shell, and the fire extinguishing agent is arranged in the coating layer; at least one pressure relief part is arranged on the coating layer, the pressure relief part is configured to be broken when the pressure intensity in the coating layer reaches a preset threshold value, and the fire extinguishing agent flows out from the pressure relief part; according to the technical scheme, when the battery is in thermal runaway, the internal pressure intensity of the coating layer is increased, and when the internal pressure intensity of the coating layer reaches the preset threshold value, the pressure relief part is broken, so that the fire extinguishing agent can enter the battery shell, a chained exothermic reaction generated in the battery when the battery is in thermal runaway is inhibited, and the safety of the battery is improved. And the fire extinguishing effect on the battery product is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a fire extinguishing device and battery. BACKGROUND

[0002] The battery in the battery product in the prior art is generally cooled and the fire spreading is suppressed by the fire extinguishing device arranged outside the battery when the battery is in thermal runaway, but the main reason for the thermal runaway of the battery is that the uncontrollable rise of the temperature in the battery leads to a series of chemical reactions and exothermic reactions in the battery, the existing fire extinguishing device arranged outside the battery cannot effectively control the temperature rise caused by the complex chain exothermic side reaction in the battery, and thus the battery product may appear the phenomenon of multiple reignition after the fire is extinguished, and the fire extinguishing effect is poor. SUMMARY

[0003] The embodiment of the utility model provides a fire extinguishing device and battery, can effectively restrain the chain exothermic reaction in the battery, to improve the fire extinguishing effect of the battery product.

[0004] In a first aspect, the embodiment of the utility model provides a fire extinguishing device, including cladding and fire extinguishing agent, cladding is configured to set in the battery shell, fire extinguishing agent sets in the cladding,

[0005] Among them, at least one pressure relief part is arranged on the cladding, the pressure relief part is configured to break when the pressure in the cladding reaches a preset threshold, and the fire extinguishing agent flows out from the pressure relief part.

[0006] In an embodiment, the fire extinguishing agent is perfluorohexanone fire extinguishing agent.

[0007] In an embodiment, an opening is arranged on the pressure relief part, and the parts of the pressure relief part located at the periphery of the opening are connected to each other;Or

[0008] A thinning area is arranged on the pressure relief part.

[0009] In an embodiment, the preset threshold is defined as A;Wherein, A satisfies: 1.6Mpa≤A≤2.4Mpa.

[0010] In a second aspect, the embodiment of the utility model provides a battery, including:

[0011] Battery shell;

[0012] At least one electrode assembly is arranged in the battery shell;And

[0013] Fire extinguishing device, the fire extinguishing device is arranged in the battery shell.

[0014] In an embodiment, the fire extinguishing device and the electrode assembly are arranged in the battery shell.

[0015] In an embodiment, the battery further comprises an insulation film, the insulation film covering the fire extinguishing device and the electrode assembly;

[0016] Wherein, the pressure relief portion and the insulation film have a gap therebetween.

[0017] In an embodiment, the number of electrode assemblies is set to at least two;

[0018] The fire extinguishing device is arranged between any two adjacent electrode assemblies.

[0019] In an embodiment, the covering layer comprises:

[0020] Oppositely arranged first and second surfaces, the first and second surfaces being in contact with adjacent electrode assemblies, respectively; and

[0021] Oppositely arranged third and fourth surfaces, the third and fourth surfaces being connected to the first and second surfaces, respectively.

[0022] Wherein, at least one of the third and fourth surfaces is provided with a pressure relief portion.

[0023] In an embodiment, the volume of the internal space of the battery housing is defined as V, and the volume of the fire extinguishing device is defined as V1; wherein V and V1 satisfy:

[0024] 0.048V≤V1≤0.052V.

[0025] In an embodiment, the battery comprises an electrolyte and a cosolvent, both of which are arranged in the battery housing.

[0026] In an embodiment, the total volume of the electrolyte and the cosolvent is defined as V2, and the volume of the cosolvent is defined as V3; wherein V2 and V3 satisfy: 0.048V2≤V3≤0.052V2.

[0027] In an embodiment, the covering layer comprises an aluminum plastic film covering layer;

[0028] Wherein, the fire extinguishing agent is arranged in the aluminum plastic film covering layer, and the pressure relief portion is correspondingly arranged on the aluminum plastic film covering layer.

[0029] The beneficial effects of the embodiments of the present application are as follows:

[0030] In the technical solution of the present application, when the battery is in thermal runaway, the internal pressure of the covering layer will increase, and when the internal pressure of the covering layer reaches a preset threshold, the pressure relief portion will rupture, thereby enabling the fire extinguishing agent to flow out of the pressure relief portion and into the battery housing, thereby inhibiting the chain heat release reaction occurring inside the battery when the battery is in thermal runaway, and thereby improving the fire extinguishing effect on the battery product. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below are only some of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative labor based on these drawings also belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the positional words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawing; and "inner" and "outer" are relative to the outline of the device.

[0032] Figure 1 is a perspective view of the fire extinguishing device provided by the embodiment of the present application;

[0033] Figure 2 is a structure schematic view of the fire extinguishing device from one perspective provided by the embodiment of the present application;

[0034] Figure 3 is a cross-sectional view of the fire extinguishing device provided by the embodiment of the present application;

[0035] Figure 4 is a structure schematic view of the fire extinguishing device from another perspective provided by the embodiment of the present application;

[0036] Figure 5 is an explosion schematic view of the battery provided by the embodiment of the present application;

[0037] Figure 6 is an assembly schematic view of the fire extinguishing device and the electrode assembly provided by the embodiment of the present application.

[0038] Explanation of reference signs:

[0039] 100, fire extinguishing device; 200, battery; 1, cladding layer; 2, fire extinguishing agent; 11, pressure relief part; 101, first surface; 102, second surface; 103, third surface; 104, fourth surface; 4, battery shell; 5, electrode assembly; 6, insulating film. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the positional words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawing; and "inner" and "outer" are relative to the outline of the device.

[0041] The application provides a fire extinguishing device, Figures 1 to 6 for some embodiments of the application.

[0042] Please refer to Figures 1 to 3 The fire extinguishing device 100 comprises a cladding layer 1 and a fire extinguishing agent 2, the cladding layer 1 is arranged in a battery shell 4, and the fire extinguishing agent 2 is arranged in the cladding layer 1; wherein at least one pressure relief part 11 is arranged on the cladding layer 1, the pressure relief part 11 is configured to break when the internal pressure of the cladding layer 1 reaches a preset threshold, and the fire extinguishing agent 2 flows out of the pressure relief part 11.

[0043] In the technical scheme of the application, when the battery 200 is in thermal runaway, the internal pressure of the cladding layer 1 increases, and when the internal pressure of the cladding layer 1 reaches a preset threshold, the pressure relief part 11 breaks, thereby enabling the fire extinguishing agent 2 to flow out of the pressure relief part 11 and enter the inside of the battery shell 4, thereby inhibiting the chain heat release reaction occurring inside the battery 200 when the battery 200 is in thermal runaway, and thereby improving the fire extinguishing effect on the battery product.

[0044] When the battery 200 is in a normal state, the cladding layer 1 can prevent the fire extinguishing agent 2 from entering the internal environment of the battery shell 4, thereby avoiding the influence of the fire extinguishing agent 2 on the normal chemical reaction inside the battery 200; when the battery 200 is in a thermal runaway state, the pressure relief part 11 on the cladding layer 1 breaks, thereby enabling the fire extinguishing agent 2 to enter the inside of the battery shell 4 and inhibit the chain heat release reaction occurring inside the battery 200 when the battery 200 is in thermal runaway.

[0045] In some embodiments of the application, the fire extinguishing agent 2 is a perfluorohexanone fire extinguishing agent; that is, when the battery 200 is in thermal runaway, the temperature inside the battery 200 continues to rise, thereby causing the perfluorohexanone fire extinguishing agent to begin to vaporize. Since the inside of the cladding layer 1 is a sealed environment, the internal pressure of the cladding layer 1 continues to rise as the perfluorohexanone fire extinguishing agent vaporizes. When the internal pressure of the cladding layer 1 reaches a preset threshold, the pressure relief part 11 breaks, enabling the perfluorohexanone fire extinguishing agent to enter the inside of the battery shell 4, thereby covering the surface of the electrode assembly 5 and cooling and chemically inhibiting the electrode assembly 5.

[0046] It should be noted that perfluorohexanone has a short atmospheric residence time, an atmospheric residence time of about 5 days, a low greenhouse effect, a global warming potential of 1, and does not destroy the ozone layer, with an ozone depletion potential of 0. In addition, the fire extinguishing concentration of perfluorohexanone is low, typically between 4.5% and 5.8%, so in some embodiments of the application, perfluorohexanone is used as a fire extinguishing material and forms a fire extinguishing agent 2 applied inside the battery 200, and has the effects of being new, efficient, environmentally friendly and clean.

[0047] In addition, in one embodiment of the present application, a fire extinguishing device 100 having a perfluorohexanone fire extinguishing agent disposed inside the battery housing 4 can start fire extinguishing during the temperature rise stage of thermal runaway of the battery 200, that is, the thermal runaway of the battery 200 is suppressed before an open flame appears in the battery 200, thereby reducing the risk of fire and explosion of the battery 200.

[0048] At the same time, the fire extinguishing device 100 can also cooperate with the fire extinguishing structure arranged on the outside of the battery 200 in the battery product, and then cooperate with the fire extinguishing structure outside the battery 200 to enhance the fire safety of the battery product.

[0049] In addition, there is no limitation on the form in which the pressure relief portion 11 ruptures when the pressure in the coating layer 1 reaches a preset threshold.

[0050] In one embodiment of the present application, an opening is provided on the pressure relief portion 11, and the pressure relief portions 11 located at the periphery of the opening are connected to each other, that is, at least a portion of the pressure relief portion 11 is not integrally provided at the opening, and therefore the connection strength is weak. When the internal pressure of the covering layer reaches a preset threshold value, the connection of the pressure relief portion 11 at the opening will be destroyed, allowing the perfluorohexanone fire extinguishing agent to enter the interior of the battery housing 4 from the opening, thereby covering the surface of the electrode assembly 5, cooling and chemically inhibiting the electrode assembly 5.

[0051] In addition, the parts of the pressure relief portion 11 located at the opening may be overlapped and then connected to seal the opening, or may be directly connected without overlapping to seal the opening, which is not limited here.

[0052] In another embodiment of the present application, a thinning area is provided on the pressure relief portion 11, and the thickness of the portion of the pressure relief portion 11 located in the thinning area is less than the thickness of the portion of the pressure relief portion 11 not located in the thinning area. Therefore, when the internal pressure of the covering layer reaches a preset threshold value, the pressure relief portion 11 located in the thinning area will be ruptured, so that the perfluorohexanone fire extinguishing agent can enter the interior of the battery case 4 from the ruptured portion of the thinning area of ​​the pressure relief portion 11, thereby covering the surface of the electrode assembly 5, cooling and chemically inhibiting the electrode assembly 5.

[0053] In some embodiments of the present application, the coating layer 1 is an aluminum-plastic film coating layer, and the pressure relief portion 11 is a sealed area after the fire extinguishing agent 2 is coated by the aluminum-plastic film coating layer.

[0054] In some embodiments of the present application, the aluminum-plastic film covering layer is sealed using an ultrasonic welding process.

[0055] In some embodiments of the present application, the aluminum-plastic film coating layer is mainly formed by stacking a nylon layer, an aluminum foil layer and a cast polypropylene film layer in sequence, and the adjacent nylon layer and aluminum foil layer, aluminum foil layer and cast polypropylene film layer are connected by an adhesive.

[0056] In some embodiments of the present application, the thickness of the aluminum plastic film coating layer is 113 μm; wherein the thickness of the nylon layer is 20 μm, the thickness of the aluminum foil layer is 40 μm, and the thickness of the cast polypropylene film layer is 53 μm.

[0057] In some embodiments of the present application, the preset threshold value is A; wherein A satisfies: 1.6 Mpa≤A≤2.4 Mpa; that is, in this embodiment, when A satisfies the range of 1.6 Mpa≤A≤2.4 Mpa, the pressure relief portion 11 will be broken, so that the fire extinguishing agent 2 can enter the inside of the battery case 4, thereby preventing the chain heat release reaction inside the battery 200 when the battery 200 is in thermal runaway.

[0058] The working principle of the fire extinguishing device 100 in the embodiments of the present application is as follows: when the battery 200 is in a normal state, the coating layer 1 can prevent the perfluorocyclohexanone fire extinguishing agent from entering the inside of the battery case 4, thereby preventing the perfluorocyclohexanone fire extinguishing agent from affecting the normal chemical reaction inside the battery 200; when the battery 200 is in a thermal runaway state, the temperature inside the battery 200 continues to rise, the perfluorocyclohexanone fire extinguishing agent begins to vaporize, thereby continuously increasing the internal pressure of the coating layer 1; when the internal pressure of the coating layer 1 reaches 1.6 Mpa≤A≤2.4 Mpa, the rupture of the pressure relief portion 11 causes the perfluorocyclohexanone fire extinguishing agent to enter the inside of the battery case 4, thereby covering the surface of the electrode assembly 5 and cooling and chemically inhibiting the electrode assembly 5.

[0059] It should be noted that setting the value of A between 1.6 Mpa and 2.4 Mpa can cause the fire extinguishing device 100 to release the perfluorocyclohexanone fire extinguishing agent at the initial stage of thermal runaway of the battery 200, that is, before the battery 200 produces an open flame, thereby inhibiting the chain heat release reaction inside the battery 200 when the battery 200 is in thermal runaway, and improving the safety of the battery 200.

[0060] Please refer to Figures 4 to 6 The present application also provides a battery 200, which comprises a battery case 4, at least one electrode assembly 5, and a fire extinguishing device 100, wherein the fire extinguishing device 100 is arranged in the battery case 4. The fire extinguishing device 100 is as described above. Since the battery 200 adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described here in detail.

[0061] In the technical solutions of the present application, when the battery 200 is in thermal runaway, the internal pressure of the coating layer 1 in the fire extinguishing device 100 increases, and when the internal pressure of the coating layer 1 reaches the preset threshold value, the pressure relief portion 11 will be broken, thereby allowing the fire extinguishing agent 2 to enter the inside of the battery case 4, thereby inhibiting the chain heat release reaction inside the battery 200 when the battery 200 is in thermal runaway, and improving the fire extinguishing effect on the battery product.

[0062] In an embodiment of the present application, the fire extinguishing agent 2 is a perfluorohexanone fire extinguishing agent; that is, when the battery 200 is in thermal runaway, the temperature inside the battery 200 continues to rise, thereby causing the perfluorohexanone fire extinguishing agent to begin to vaporize. Since the inside of the cladding layer 1 is a sealed environment, the internal pressure of the cladding layer 1 continues to rise as the perfluorohexanone fire extinguishing agent vaporizes. When the internal pressure of the cladding layer 1 reaches a preset threshold, the pressure relief portion 11 ruptures, allowing the perfluorohexanone fire extinguishing agent to enter the inside of the battery case 4, thereby covering the surface of the electrode assembly 5 and cooling and chemically suppressing the electrode assembly 5.

[0063] It should be noted that the specific type of the electrode assembly 5 in the battery 200 is not limited, and the electrode assembly 5 can be made by a winding process or a stacking process.

[0064] The relative positions between the electrode assembly 5 and the fire extinguishing device 100 in the battery case 4 are also not limited. In an embodiment, the electrode assembly 5 and the fire extinguishing device 100 can be arranged in layers; in another embodiment, the electrode assembly 5 can be arranged around the outer periphery of the fire extinguishing device 100; in yet another embodiment, the fire extinguishing device 100 can be arranged around the outer periphery of the electrode assembly 5.

[0065] Please refer to Figures 5 to 6 In some embodiments of the present application, the fire extinguishing device 100 and the electrode assembly 5 are arranged in layers. That is, such an arrangement can facilitate the assembly of the fire extinguishing device 100 and the electrode assembly 5 in the battery case 4 by an operator or an operating tool.

[0066] It can be understood that if there is a relatively complex positional relationship between the fire extinguishing device 100 and the electrode assembly 5, such as the fire extinguishing device 100 being fixed in the electrode assembly 5 or the electrode assembly 5 being fixed in the fire extinguishing device 100, the production process of the battery 200 in the embodiments of the present application will be more complex.

[0067] In order to fix the fire extinguishing device 100 and the electrode assembly 5 firmly in the battery case 4, in some embodiments of the present application, the battery 200 further comprises an insulating film 6, which covers the fire extinguishing device 100 and the electrode assembly 5 to achieve the relative fixation of the fire extinguishing device 100 and the electrode assembly 5.

[0068] The pressure relief portion 11 and the insulating film 6 have a gap therebetween, that is, such an arrangement can avoid the insulating film 6 covering the pressure relief portion 11 when the battery 200 is in thermal runaway.

[0069] In some embodiments of the present application, the number of electrode assemblies 5 is set to at least two; the fire extinguishing device 100 is arranged between any two adjacent electrode assemblies 5; in this way, the operator or the operating tool can conveniently assemble the fire extinguishing device 100 and the electrode assembly 5 in the battery case 4 respectively.

[0070] Similarly, since the fire extinguishing device 100 is arranged between the two electrode assemblies 5, when thermal runaway occurs in one of the two electrode assemblies 5 or both of the two electrode assemblies 5, the fire extinguishing device 100 arranged between the two electrode assemblies 5 can better inhibit the chain heat release reaction of the electrode assembly 5 in thermal runaway.

[0071] That is, the perfluoroketone extinguishing agent will not be blocked by the other electrode assembly 5 when it flows out of the fire extinguishing device 100 and covers the surface of the electrode assembly 5 in thermal runaway.

[0072] Please refer to Figure 4 In some embodiments of the present application, the cladding layer 1 includes oppositely arranged first and second surfaces 101 and 102, oppositely arranged third and fourth surfaces 103 and 104, the first and second surfaces 101 and 102 are respectively in contact with the adjacent electrode assemblies 5; and the third and fourth surfaces 103 and 104 are respectively connected to the first and second surfaces 101 and 102; that is, in this embodiment, the electrode assemblies 5 are rectangular in shape, and the overall structure of the cladding layer 1 is also rectangularly arranged to better fit the surface of the electrode assemblies 5, thereby reducing the internal space of the battery case 4 occupied by the fire extinguishing device 100 and the two electrode assemblies 5 after assembly.

[0073] Among them, at least one of the third and fourth surfaces 103 and 104 is provided with a pressure relief portion 11; that is, by arranging the pressure relief portion 11 on at least one of the third and fourth surfaces 103 and 104, since the third and fourth surfaces 103 and 104 are not blocked by the electrode assemblies 5 when the fire extinguishing device 100 is assembled into the battery case 4, the perfluoroketone extinguishing agent can spread faster to the entire inside of the battery 200 when the battery 200 is in thermal runaway.

[0074] In an embodiment of the present application, the pressure relief portion 11 is arranged on the third surface 103; in another embodiment of the present application, the pressure relief portion 11 is arranged on the fourth surface 104; in still another embodiment of the present application, the pressure relief portion 11 is arranged on both the third and fourth surfaces 103 and 104.

[0075] In order to make the perfluoroketone extinguishing agent located in the cladding layer 1 be released faster, therefore, the third and fourth surfaces 103 and 104 of the cladding layer 1 in the embodiments of the present application are provided with the pressure relief portion 11.

[0076] In some embodiments of the present application, the volume of the inner space of the cavity of the battery shell 4 is V, and the volume of the fire extinguishing device 100 is V1; wherein V and V1 satisfy: 0.048V≤V1≤0.052V; that is, the volume V1 of the fire extinguishing device 100 satisfies the interval range of 0.048V≤V1≤0.052V, so that the fire extinguishing device 100 occupies a smaller space in the battery 200, thereby having a smaller impact on the internal structure design of the battery 200, and can significantly improve the safety performance of the battery 200 at a lower manufacturing cost of the fire extinguishing device 100.

[0077] If the value of V1 is less than 0.048V, the cooling and fire extinguishing effect of the fire extinguishing device 100 on the battery 200 when the battery 200 is in thermal runaway may be poor; if the value of V1 is greater than 0.052V, the fire extinguishing device 100 occupies a larger space in the battery 200, thereby affecting the assembly of other components inside the battery 200.

[0078] In some embodiments of the present application, the battery 200 further comprises an electrolyte and a cosolvent, and both the electrolyte and the cosolvent are arranged in the battery shell 4; that is, in this embodiment, by arranging the cosolvent in the electrolyte, when the material in the fire extinguishing agent 2 enters the battery shell 4, the cosolvent can increase the solubility of the material in the fire extinguishing agent 2 in the electrolyte to increase the dissolution speed of the material in the fire extinguishing agent 2 in the electrolyte, thereby increasing the diffusion speed of the material in the fire extinguishing agent 2 in the electrolyte, and thereby strengthening the cooling and chemical inhibition effect of the fire extinguishing device 100 inside the battery 200, and improving the safety performance of the battery 200.

[0079] In some embodiments of the present application, the fire extinguishing agent 2 is a perfluorohexanone fire extinguishing agent, and the cosolvent is a non-polar fluorinated ether cosolvent, that is, the non-polar fluorinated ether cosolvent can increase the diffusion speed of the perfluorohexanone in the electrolyte.

[0080] The non-polar fluorinated ether cosolvent can reduce the surface tension of the perfluorohexanone and increase the solubility of the perfluorohexanone in the electrolyte.

[0081] It should be noted that the perfluorohexanone fire extinguishing agent is in a liquid state at room temperature, and when the temperature inside the battery rises, the perfluorohexanone fire extinguishing agent will quickly change to a gaseous state, thereby absorbing a large amount of heat in the battery 200; at the same time, the perfluorohexanone will undergo chemical cracking at high temperature, and the free radicals generated by the chemical cracking of the perfluorohexanone combine with the active free radicals generated in the combustion process, thereby blocking the chain reaction of combustion, and thereby cooling and chemically inhibiting the electrode assembly 5.

[0082] In addition, the perfluorohexanone fire extinguishing agent does not chemically react with the chemicals in the battery 200.

[0083] In an embodiment of the present application, the non-polar fluoroether cosolvent is one or more of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, 2,2,2-trifluoroethyl ether, 2,2,2-trifluoroethyl ester, etc.

[0084] In some embodiments of the present application, the total volume of the electrolyte and the cosolvent is V2, and the volume of the cosolvent is V3; wherein V2 and V3 satisfy: 0.048V2≤V3≤0.052V2; in this embodiment, setting the volume V3 of the cosolvent to satisfy the interval range of 0.048V2≤V3≤0.052V2 can further improve the diffusion speed of the materials in the fire extinguishing agent 2 in the battery case 4.

[0085] If the value of V3 is less than 0.048V2, it may affect the improvement effect of the cosolvent on the diffusion speed of the materials in the fire extinguishing agent 2 in the battery case 4; if the value of V3 is greater than 0.052V2, the content of the cosolvent is relatively high, which may affect the performance of the battery 200.

[0086] The working principle of the battery 200 of the embodiment of the present application is as follows: when the battery 200 occurs thermal runaway, the temperature inside the battery 200 will continue to rise, and then the perfluorocyclohexanone fire extinguishing agent begins to vaporize, since the inside of the coating layer 1 is a sealed environment, the internal pressure of the coating layer 1 will continuously rise while the perfluorocyclohexanone fire extinguishing agent vaporizes, after the internal pressure of the coating layer 1 reaches a preset threshold, the pressure relief portion 11 breaks, so that the materials in the perfluorocyclohexanone fire extinguishing agent can enter the inside of the battery case 4, and the auxiliary non-polar fluoroether cosolvent can improve the diffusion speed of the perfluorocyclohexanone in the battery case 4, and then the perfluorocyclohexanone quickly covers the surface of the electrode assembly 5, and the electrode assembly 5 is cooled and chemically inhibited.

[0087] The above has carried on the detailed introduction to the embodiment of the present application, the principle and implementation mode of the present application have been described by applying specific examples in this paper, and the above embodiment is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A fire extinguishing device, characterized in that: comprising a coating layer and a fire extinguishing agent, wherein the coating layer is configured to be disposed in a battery housing, and the fire extinguishing agent is disposed in the coating layer; Wherein, at least one pressure relief portion is provided on the coating layer, and the pressure relief portion is configured to rupture when the pressure in the coating layer reaches a preset threshold, and the fire extinguishing agent flows out from the pressure relief portion.

2. The fire extinguishing device according to claim 1, characterized in that: The fire extinguishing agent is perfluorohexanone fire extinguishing agent.

3. The fire extinguishing device according to claim 1, characterized in that: The pressure relief portion is provided with an opening, and parts of the pressure relief portion located at the periphery of the opening are connected to each other; or A thinning area is provided on the pressure relief portion.

4. The fire extinguishing device according to claim 1, characterized in that: The preset threshold is defined as A; wherein A satisfies: 1.6Mpa≤A≤2.4Mpa.

5. A battery, characterized in that: include: Battery housing; at least one electrode assembly disposed within the battery housing; and The fire extinguishing device according to any one of claims 1 to 4, wherein the fire extinguishing device is disposed in the battery housing.

6. The battery according to claim 5, characterized in that The fire extinguishing device and the electrode assembly are stacked in the battery casing.

7. The battery according to claim 6, characterized in that The battery further includes an insulating film, wherein the insulating film covers the fire extinguishing device and the electrode assembly; Wherein, there is a gap between the pressure relief portion and the insulating film.

8. The battery according to claim 5, characterized in that The number of the electrode assemblies is set to at least two; The fire extinguishing device is arranged between any two adjacent electrode assemblies, and the pressure relief portion is located in the gap between the two adjacent electrode assemblies.

9. The battery according to claim 8, characterized in that The coating layer comprises: A first surface and a second surface are disposed opposite to each other, wherein the first surface and the second surface are respectively in contact with the adjacent electrode assembly; and a third surface and a fourth surface disposed opposite to each other, the third surface and the fourth surface being connected to the first surface and the second surface respectively; Wherein, the pressure relief portion is provided on at least one of the third surface and the fourth surface.

10. The battery according to claim 5, characterized in that The volume of the inner space of the battery housing is defined as V, and the volume of the fire extinguishing device is defined as V1; wherein V and V1 satisfy: 0.048V≤V1≤0.052V.

11. The battery according to claim 5, characterized in that The battery includes an electrolyte and a co-solvent, and both the electrolyte and the co-solvent are arranged in the battery shell.

12. The battery according to claim 11, characterized in that The total volume of the electrolyte and the co-solvent is defined as V2, and the volume of the co-solvent is defined as V3; wherein, V2 and V3 satisfy: 0.048V2≤V3≤0.052V2.

13. The battery according to claim 5, characterized in that The coating layer is an aluminum-plastic film coating layer; Wherein, the fire extinguishing agent is arranged in the aluminum-plastic film covering layer, and the pressure relief part is correspondingly arranged on the aluminum-plastic film covering layer.

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