Fire filtering structure, pressure release valve and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a fire filtering structure, a pressure release valve and a battery pack, the fire filtering structure comprises a fire filtering net and a cleaning part, the fire filtering net is provided with a first side face and a second side face which are oppositely arranged, and net holes penetrating through the first side face and the second side face are formed in the fire filtering net; the cleaning part is in contact with the first side surface and / or the second side surface of the fire filtering net, and the cleaning part can move on the first side surface and / or the second side surface. When a battery cell in the battery pack is subjected to thermal runaway, high-pressure and high-temperature airflow is discharged out of the battery pack through the fire filtering net, then the airflow drives the cleaning part to move on the first side surface and / or the second side surface, and the cleaning part cleans blockages in high-temperature gas in meshes of the fire filtering net, so that particulate matters are prevented from being accumulated at the meshes of the fire filtering net; the battery pack can maintain a relatively high exhaust speed, and the battery pack is prevented from explosion, so that the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a fire filter structure, a pressure relief valve and a battery pack. Background Art

[0002] In order to ensure the safety of the battery pack when the battery pack is in thermal runaway, a pressure relief valve is generally installed on the battery pack housing to discharge high-temperature gas from the battery pack when the battery pack is in thermal runaway, reduce heat accumulation in the battery pack and reduce the gas pressure in the pack, thereby improving the safety of the battery pack;

[0003] However, a large amount of particulate matter is discharged when the battery cell undergoes thermal runaway. As the exhaust proceeds, the mesh of the fire filter will be clogged and then the exhaust channel of the pressure relief valve will be blocked, affecting the exhaust effect. Utility Model Content

[0004] The present application provides a fire filter structure, a pressure relief valve and a battery pack, which are used to solve the problem in the prior art that a large amount of particulate matter is discharged when the battery cell is thermally runaway, and as the exhaust proceeds, the mesh of the fire filter will be clogged and then the exhaust channel of the pressure relief valve will be blocked.

[0005] In one aspect, the present application provides a fire filter structure, comprising:

[0006] The fire filter has a first side surface and a second side surface that are arranged opposite to each other, and a mesh hole that passes through the first side surface and the second side surface is opened on the fire filter;

[0007] The cleaning portion contacts the first side surface and / or the second side surface of the fire filter, and the cleaning portion can move on the first side surface and / or the second side surface.

[0008] In one possible design, the cleaning portion is rotatably connected to the fire filter, and the cleaning portion can rotate around a first axis on the first side and / or the second side under the impact of the airflow.

[0009] In one possible design, the cleaning section includes:

[0010] Swivel seat;

[0011] The fan blades are arranged along the circumference of the rotating seat, and a cleaning convex portion is formed on the side of the fan blade close to the fire filter, and the side of the cleaning convex portion away from the fan blade is in contact with the first side surface and / or the second side surface.

[0012] In one possible design, the cleaning protrusion includes brush thorns, and the brush thorns are multiple and arranged at intervals.

[0013] In one possible design, the end of the brush away from the fan blade is a spherical end, and the spherical end is in contact with the fire filter.

[0014] In one possible design, the melting point of the cleaning portion is greater than 1000°C.

[0015] In one possible design, the fire filter structure further includes a rotating shaft, one end of which is connected to the rotating seat, and the other end of which is connected to the fire filter net.

[0016] On the other hand, the present application also provides a pressure relief valve, including a valve body, the fire filter structure as described above, and a sealing strip.

[0017] In one possible design, the pressure relief valve further includes a breathable membrane, which is disposed in the inner cavity of the valve body and is opposite to the fire filter.

[0018] On the other hand, the present application also provides a battery pack, comprising the pressure relief valve as described above.

[0019] The beneficial effects of this application are as follows:

[0020] The fire filtering structure of the present application is provided with a fire filtering net and a cleaning part. The cleaning part is in contact with the first side and / or the second side of the fire filtering net. By moving the cleaning part on the first side and / or the second side, the cleaning part cleans the blockages in the high-temperature gas in the mesh holes on the fire filtering net, thereby preventing a large amount of blockages from accumulating in the mesh holes.

[0021] When thermal runaway occurs in the battery cells in the battery pack, the high-pressure and high-temperature airflow is discharged out of the battery pack through the fire filter. The cleaning unit can move on the first side and / or the second side, and then clean the mesh holes of the fire filter as well as the first side and the second side, thereby avoiding the accumulation of particulate matter in the mesh holes of the fire filter, enabling the battery pack to maintain a high exhaust speed and preventing explosion, thereby improving the safety of the battery pack.

[0022] The pressure relief valve provided in the present application includes the fire filter structure in the present application, and thus includes all the above-mentioned advantages of the fire filter structure.

[0023] The battery pack provided in the present application includes the pressure relief valve in the present application, and therefore also includes all the above-mentioned advantages of the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of a fire filter structure provided for one embodiment of the present application;

[0026] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0027] Figure 3 for Figure 2 A magnified view of the structure at B in the middle;

[0028] Figure 4 A schematic structural diagram of a cleaning portion of a fire filter structure provided in accordance with an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a pressure relief valve provided in one embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structural decomposition of a pressure relief valve provided for one embodiment of the present application.

[0031] Reference numerals:

[0032] 100, fire filter; 110, first side; 120, second side; 200, cleaning part; 210, rotating seat; 220, fan blade; 221, brush; 310, rotating shaft; 320, fixing bolt; 400, valve body; 500, sealing strip; 600, breathable membrane; 700, steel bushing. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] Combine the following Figure 1-Figure 6 , describing the fire filter structure provided in the embodiment of the present application, the fire filter structure is mainly used in the pressure relief valve structure of the battery pack, and is used to discharge the high-temperature and high-pressure gas from the battery pack while blocking the flames in the battery pack when the battery pack is thermally runaway.

[0035] Specifically, the fire filtering structure includes a fire filtering net 100 and a cleaning part 200. Figure 1 , Figure 2As shown, the fire filter net 100 has a first side surface 110 and a second side surface 120 that are arranged opposite to each other, and a mesh hole that penetrates the first side surface 110 and the second side surface 120 is opened on the fire filter net 100; the cleaning part 200 contacts the first side surface 110 and / or the second side surface 120 of the fire filter net 100, and the cleaning part 200 can move on the first side surface 110 and / or the second side surface 120. In some specific embodiments, the fire filter net 100 is a plate-like structure, the mesh hole is a through hole, and the central axis of the mesh hole is perpendicular to the plane where the fire filter net 100 is located. In some embodiments, the cleaning part 200 is installed on the fire filter net 100; in other embodiments, the cleaning part 200 is installed on the housing of the pressure relief valve; in still other embodiments, the cleaning part 200 can also be installed in the structure in the battery pack. In some embodiments, the cleaning part 200 is arranged on one side of the fire filter net 100, that is, the cleaning part 200 contacts the first side surface 110 or the second side surface 120 of the fire filter net 100. In other embodiments, the cleaning part 200 is disposed on both sides of the fire filter net 100, that is, there are two cleaning parts 200, one of which is in contact with the first side surface 110 of the fire filter net 100, and the other cleaning part 200 is in contact with the second side surface 120 of the fire filter net 100. The cleaning part 200 is moved on the first side surface 110 and the second side surface 120 of the fire filter net 100 to take away the gas in the mesh. Specifically, the cleaning part 200 can perform rotational motion or linear motion.

[0036] By utilizing the technical solution of the above-mentioned embodiment, by making the cleaning part 200 contact with the first side surface 110 and / or the second side surface 120 of the fire filter net 100, when the cleaning part 200 moves on the first side surface 110 and the second side surface 120, it is equivalent to cleaning the first side surface 110 and the second side surface 120, so that the blockage in the high-temperature gas in the mesh of the fire filter net 100 can be cleaned out, thereby preventing a large amount of blockage from accumulating in the mesh.

[0037] When thermal runaway occurs in the battery cells in the battery pack, high-pressure and high-temperature air flows through the fire filter 100 and is discharged out of the battery pack. The cleaning unit 200 can move on the first side 110 and / or the second side 120, and then clean the mesh of the fire filter 100 and the first side 110 and the second side 120, thereby avoiding the accumulation of particulate matter in the mesh of the fire filter 100, enabling the battery pack to maintain a high exhaust speed, preventing the battery pack from exploding, and thus improving the safety of the battery pack.

[0038] Reference Figure 1 , Figure 2 , Figure 3As shown, in some embodiments of the present application, the cleaning part 200 is rotatably connected to the fire filter net 100, and the cleaning part 200 can rotate around the first axis on the first side 110 and / or the second side 120 under the impact of the airflow. In some specific embodiments, the cleaning part 200 is arranged on one side of the fire filter net 100, the cleaning part 200 is in contact with the first side 110, and the cleaning part 200 is rotatably connected to the fire filter net 100, for example, the cleaning part 200 is connected to the fire filter net 100 through a rotating shaft 310. Under the impact force of the airflow, the cleaning part 200 can rotate around the rotating shaft 310, thereby rotating around the rotating shaft 310 on the first side 110, and the first axis is the central axis of the rotating shaft 310.

[0039] It should be noted that when the battery pack has thermal runaway, a large volume of high-pressure and high-temperature gas will be generated in a short period of time. This part of high-pressure and high-temperature gas will flow through the fire filter 100 and be discharged from the battery pack. Therefore, this part of high-pressure and high-temperature gas can form a very strong airflow at the fire filter 100, which is sufficient to drive the cleaning part 200 to rotate. In this way, the cleaning part 200 can be rotated in time when the battery pack has thermal runaway without adding a driving mechanism and a control system, avoiding the accumulation of particles at the mesh of the fire filter 100, enabling the battery pack to maintain a high exhaust speed, preventing the battery pack from exploding, and improving the safety of the battery pack.

[0040] Reference Figure 4As shown, in some embodiments of the present application, the cleaning unit 200 includes a rotating seat 210 and a fan blade 220, wherein the rotating seat 210 is cylindrical; the fan blade 220 is arranged along the circumference of the rotating seat 210, and a cleaning convex portion is formed on the side of the fan blade 220 close to the fire filter 100, and the side of the cleaning convex portion away from the fan blade 220 contacts the first side surface 110 and / or the second side surface 120. In some specific embodiments, the number of the fan blade 220 is at least one, for example, it can be 2, 3, etc., and the fan blade 220 is arranged around the outer circumference of the rotating seat 210, wherein the fan blade 220 and the rotating seat 210 can be an integrally formed structure or an integrally welded structure, or the fan blade 220 is fixed to the rotating seat 210 by a clamping groove, a bolt, etc.; optionally, the fan blade 220 is in the form of a thin sheet, and the fan blade 220 is a slightly bent arc-shaped fan blade 220, so that it can rotate rapidly under the impact of the airflow. In some specific embodiments, the cleaning protrusion is a protrusion protruding from the fan blade 220, for example, it can be a strip protrusion or a spherical protrusion, etc.; the cleaning protrusion and the fan blade 220 can be an integrally formed structure or an integrally welded structure, or the cleaning protrusion is fixed to the fan blade 220 by a snap-in groove, a screw, etc. The length of the cleaning protrusion is equal to the distance between the fan blade 220 and the fire filter 100, so that the side of the cleaning protrusion away from the fan blade 220 is in contact with the first side 110 of the fire filter 100. In this way, by providing the cleaning protrusion on the fan blade 220, it is helpful to increase the scraping force of the fan blade 220 on the blockage. At the same time, by providing the cleaning protrusion on the fan blade 220, it can be ensured that the fan blade 220 and the fire filter 100 are not in contact, and the gap between adjacent cleaning protrusions provides a passage for the airflow, thereby increasing the speed of airflow evacuation outside the fire filter 100, which is helpful to maintain a higher exhaust speed for the battery pack.

[0041] Reference Figure 4 As shown, in some embodiments of the present application, the cleaning protrusion includes a brush barb 221, and the brush barb 221 is multiple and arranged at intervals. In some specific embodiments, the diameter of the brush barb 221 is relatively small, for example, the diameter of the brush barb 221 is 0.1 mm, and each brush barb 221 is arranged parallel to the axial direction of the mesh. Such a configuration helps to increase the grip of the brush barb 221 to remove the blockage by reducing the diameter of the brush barb 221; at the same time, the gaps between adjacent brush barbs 221 provide a passage for the airflow, thereby increasing the speed of airflow evacuation outside the fire filter 100, which helps to maintain a higher exhaust speed for the battery pack.

[0042] In some embodiments of the present application, the end of the brush thorn 221 away from the fan blade 220 is a spherical end, and the spherical end contacts the fire filter 100. By making the end of the brush thorn 221 away from the fan blade 220 a spherical end, the friction between the brush thorn 221 and the fan blade 220 can be reduced, thereby reducing the resistance to the rotation of the brush thorn 221.

[0043] In some embodiments of the present application, the cleaning part 200 is made of a metal material with a high melting point and fire resistance, such as iron, steel, etc. The melting point of the cleaning part 200 is greater than 1000° C. This can prevent the cleaning part 200 from maintaining strength under the impact of high temperature and high pressure airflow.

[0044] Reference Figure 2 , Figure 3 As shown, in some embodiments of the present application, the fire filter structure further includes a rotating shaft 310, one end of which is connected to the rotating seat 210, and the other end of which is connected to the fire filter net 100. Specifically, one end of the rotating shaft 310 is connected to the rotating seat 210, a mounting hole is provided at the center of the fire filter net 100, the rotating shaft 310 is passed through the mounting hole, one end of the rotating shaft 310 is integrally connected to the rotating seat 210, the outer side wall of the rotating seat 210 is rotatably connected to the fan blade 220 through a bearing, and a fixing bolt 320 is installed at the other end of the rotating shaft 310, and the cleaning part 200 is installed on the fire filter net 100 through the fixing bolt 320.

[0045] The general working principle of the fire filter structure of the embodiment of the present application is as follows:

[0046] When thermal runaway occurs in the battery cells in the battery pack, high-pressure and high-temperature airflow is discharged out of the battery pack through the pressure relief valve, and the fan blades 220 rotate around the rotating shaft 310 under the action of the airflow. When the fan blades 220 rotate, the brush thorns 221 can directly clean up the particles at the mesh holes on the one hand, and on the other hand, the vibration generated by the movement of the brush thorns 221 on the surface of the fire filter 100 can also cause some particles to fall off, thereby avoiding the accumulation of particles at the filter screen to affect the exhaust effect of the battery pack, thereby improving the safety of the battery pack.

[0047] Reference Figure 5 As shown, the embodiment of the present application further provides a pressure relief valve, including a valve body 400, the fire filter structure in the above embodiment, and a sealing strip 500. Specifically, the fire filter net 100 is installed at the position of the air outlet of the valve body 400, and the four corners of the valve body 400 are respectively installed with steel bushings 700, and the four corners of the fire filter net 100 are respectively sleeved on the steel bushings 700, and the valve body 400 and the fire filter net 100 are sealed by the sealing strip 500.

[0048] Reference Figure 6 As shown, in some embodiments of the present application, the pressure relief valve further includes a breathable membrane 600 , and the breathable membrane 600 is disposed in the inner cavity of the valve body 400 , opposite to the fire filter 100 .

[0049] It should be noted that the pressure relief valve includes a fire filter structure, which also includes all the advantages of the fire filter structure mentioned above, which will not be repeated here.

[0050] An embodiment of the present application also provides a battery pack, comprising the pressure relief valve in the above embodiment.

[0051] It should be noted that the battery pack includes a pressure relief valve, which also includes all the advantages of the pressure relief valve mentioned above, which will not be repeated here.

[0052] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A fire filter structure, characterized in that: include: The fire filter has a first side surface and a second side surface that are arranged opposite to each other, and the fire filter has mesh holes that penetrate the first side surface and the second side surface; The cleaning part is in contact with the first side surface and / or the second side surface of the fire filter, and the cleaning part can move on the first side surface and / or the second side surface.

2. The fire filter structure according to claim 1, characterized in that: The cleaning portion is rotatably connected to the fire filter, and the cleaning portion can rotate around a first axis on the first side surface and / or the second side surface under the impact of airflow.

3. The fire filter structure according to claim 2, characterized in that: The cleaning unit comprises: Swivel seat; The fan blades are arranged along the circumference of the rotating seat, and a cleaning protrusion is formed on the side of the fan blade close to the fire filter, and the side of the cleaning protrusion away from the fan blade is in contact with the first side surface and / or the second side surface.

4. The fire filter structure according to claim 3, characterized in that: The cleaning protrusion includes brush thorns, and the brush thorns are multiple and arranged at intervals.

5. The fire filter structure according to claim 4, characterized in that: The end of the brush away from the fan blade is a spherical end, and the spherical end is in contact with the fire filter.

6. The fire filter structure according to any one of claims 1 to 5, characterized in that: The melting point of the cleaning part is greater than 1000°C.

7. The fire filter structure according to claim 3, characterized in that: It also includes a rotating shaft, one end of which is connected to the rotating seat, and the other end of which is connected to the fire filter.

8. A pressure relief valve, characterized in that: The invention comprises a valve body, a fire filter structure according to any one of claims 1 to 7, and a sealing strip.

9. The pressure relief valve according to claim 8, characterized in that: It also includes a breathable membrane, which is arranged in the inner cavity of the valve body and is opposite to the fire filter.

10. A battery pack, characterized in that: Includes the pressure relief valve as described in claim 9.

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