Filter screen cover for preventing explosion-proof valve of battery pack from being on fire

Abstract

The filter screen cover for preventing the explosion-proof valve of the battery pack from being on fire is arranged around a pressure relief opening of the explosion-proof valve of the battery pack and is fixedly connected to a battery box body, and an outer-layer single-layer filter screen is fixed on the battery box body to filter high-temperature flue gas and solids generated by thermal runaway; the inner-layer multi-layer filter screen is sleeved in the outer-layer single-layer filter screen to secondarily filter high-temperature flue gas and solids from the outer-layer single-layer filter screen, the outer-layer filter screen is adjacent to the outer-layer single-layer filter screen, and the outer-layer filter screen is provided with outer-layer filter screen holes for filtering the high-temperature flue gas and solids from the outer-layer single-layer filter screen; the middle-layer filter screen is arranged on the side, away from the outer-layer single-layer filter screen, of the outer-layer filter screen at intervals, middle-layer filter screen holes for filtering high-temperature flue gas and solids from the outer-layer filter screen are formed in the middle-layer filter screen, and inner-layer filter screen holes for filtering high-temperature flue gas and solids from the middle-layer filter screen are formed in the inner-layer filter screen; and the inner-layer filter screen holes and the middle-layer filter screen holes are arranged in a staggered manner. The safety of the filter screen cover is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal runaway of electric vehicle battery packs, in particular to a filter cover for preventing a battery pack explosion-proof valve from catching fire. Background Art

[0002] In the prior art, when a single cell or battery module experiences thermal runaway, the explosion-proof valve of the single cell opens, and high-temperature solids (isolation membrane, positive and negative pole pieces), high-temperature liquids (electrolyte), high-temperature gases (electrochemical reactants), etc. are directly sprayed into the battery pack, and then quickly diffused into the entire battery pack. When the flue gas accumulates to a certain pressure inside the battery pack, the explosion-proof valve will be opened to release the pressure. The main components of the flue gas discharged by the explosion-proof valve are CO / CO2 / C2H2 / H2 / CH4, etc., and there are also some high-temperature solids. When the combustible gas in the flue gas discharged by the explosion-proof valve comes into contact with the air and forms a combustion concentration, the high-temperature solids discharged therewith will become an ignition source. However, the current explosion-proof valve does not have the function of eliminating flames. When the combustible gas at the tail of the explosion-proof valve is ignited, the temperature inside the battery pack will rise sharply, thereby aggravating the thermal diffusion of the battery pack, and then causing greater harm to the vehicle and personnel. In order to prevent the explosion-proof valve from catching fire, there are also filter designs to filter sparks, but they are all integrated with the explosion-proof valve, and their filtering area is small, which will cause the pressure relief to be not smooth. At the same time, the filter structure is mostly a single or double-layer filter, and its main function is also physical filtering. It cannot reduce the probability of spark outflow and the temperature of sparks while ensuring smooth airflow, and there is still a risk of sparks igniting combustible gases.

[0003] The above information disclosed in the background technology section is only used to enhance the understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0004] The utility model aims to provide a filter screen cover which can prevent a battery pack explosion-proof valve from catching fire, thereby improving safety.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model discloses a filter cover for preventing a battery pack explosion-proof valve from catching fire, which is installed around a pressure relief port of the battery pack explosion-proof valve and fixedly connected to a battery box. The filter cover comprises:

[0007] The outer single-layer filter is fixed to the battery box to filter the high-temperature smoke and solids generated by thermal runaway.

[0008] The inner multi-layer filter is set in the outer single-layer filter to filter the high-temperature flue gas and solids from the outer single-layer filter for the second time. The inner multi-layer filter includes:

[0009] The outer filter is adjacent to the outer single-layer filter. The outer filter is provided with outer filter holes for filtering high-temperature flue gas and solids from the outer single-layer filter.

[0010] The middle filter is arranged at a distance from the outer filter on one side of the outer filter. A first gap layer is formed between the middle filter and the outer filter. The middle filter is provided with middle filter holes for filtering high-temperature flue gas and solids from the outer filter. The middle filter holes are arranged alternately with the outer filter holes.

[0011] The inner filter is arranged at intervals on the side of the middle filter away from the outer filter, and a second gap layer is formed between the middle filter and the inner filter. The inner filter is provided with inner filter holes for filtering high-temperature flue gas and solids from the middle filter, and the inner filter holes are arranged alternately with the middle filter holes.

[0012] In the filter cover for preventing the battery pack explosion-proof valve from catching fire, the mesh diameter of the outer single-layer filter is 3 mm.

[0013] In the filter screen cover for preventing the battery pack explosion-proof valve from catching fire, the outer single-layer filter screen is an open rectangular parallelepiped structure.

[0014] In the filter cover for preventing the explosion-proof valve of the battery pack from catching fire, each surface of the rectangular structure is evenly distributed with mesh holes.

[0015] In a filter cover for preventing a battery pack explosion-proof valve from catching fire, an opening of a rectangular structure has a welding surface for connecting to a box body.

[0016] In the filter cover for preventing the battery pack explosion-proof valve from catching fire, the inner multi-layer filter is an open rectangular structure, and a mesh hole is provided on the side opposite to the opening.

[0017] In the filter cover for preventing the battery pack explosion-proof valve from catching fire, the rectangular structure is a cube structure.

[0018] In the filter screen cover for preventing the battery pack explosion-proof valve from catching fire, the outer filter screen, the middle filter screen and the inner filter screen are stacked in parallel at intervals.

[0019] In the filter screen cover for preventing the explosion-proof valve of the battery pack from catching fire, the inner filter screen is adjacent to the pressure relief port of the explosion-proof valve.

[0020] In the filter cover for preventing the battery pack explosion-proof valve from catching fire, the filter cover for preventing the battery pack explosion-proof valve from catching fire has a symmetrical structure.

[0021] In the above technical scheme, the utility model provides a filter cover for preventing the battery pack explosion-proof valve from catching fire, which has the following beneficial effects: the filter cover for preventing the battery pack explosion-proof valve from catching fire adds a multi-layer offset stacked filter design near the pressure relief port of the battery pack explosion-proof valve. The filter is not integrated with the explosion-proof valve, but is directly connected to the box body, thereby increasing the filtration area and ensuring smooth pressure relief. The outer filter blocks solids larger than 3mm without affecting the passage of airflow. The three-layer offset stacking design of the inner filter blocks and lowers the temperature of solid particles while ensuring smooth pressure relief, thereby preventing the combustible gas at the pressure relief port of the battery pack from being ignited by high-temperature fixed particles. Preventing more serious heat diffusion of the entire package further ensures the safety of the entire vehicle and the passenger compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a structural schematic diagram of the arrangement position of the filter cover on the battery pack to prevent the battery pack explosion-proof valve from catching fire according to the utility model.

[0024] Figure 2 The utility model is a schematic diagram of the outer single-layer filter structure of the filter cover for preventing the battery pack explosion-proof valve from catching fire.

[0025] Figure 3 It is a schematic diagram of the inner multi-layer filter structure of the filter cover for preventing the battery pack explosion-proof valve from catching fire according to the utility model.

[0026] Figure 4 for Figure 3 A schematic cross-sectional structural diagram of the inner multi-layer filter AA of the filter cover for preventing the battery pack explosion-proof valve from catching fire according to the utility model.

[0027] Figure 5 for Figure 1 A schematic cross-sectional structural diagram of the filter cover BB of the utility model for preventing the battery pack explosion-proof valve from catching fire. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, 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" 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 invention 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 invention.

[0032] 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] like Figure 1-5 As shown, in one embodiment, a filter cover for preventing a battery pack explosion-proof valve from catching fire is installed around a pressure relief port 1-2 of the battery pack explosion-proof valve and is fixedly connected to a battery box 1-3. The filter cover includes:

[0037] The outer single-layer filter 2-1 is fixed to the battery box 1-3 to filter the high-temperature smoke and solids generated by thermal runaway.

[0038] The inner multi-layer filter screen 4-1 is set in the outer single-layer filter screen 2-1 to filter the high-temperature flue gas and solids from the outer single-layer filter screen 2-1 for the second time. The inner multi-layer filter screen includes:

[0039] The outer filter screen is adjacent to the outer single-layer filter screen 2-1, and is provided with an outer filter screen hole 3-1 for filtering high-temperature flue gas and solids from the outer single-layer filter screen 2-1.

[0040] The middle layer filter is arranged at a distance from the outer layer filter 2-1 on one side of the outer layer filter. A first gap layer 3-2 is formed between the middle layer filter and the outer layer filter. The middle layer filter is provided with middle layer filter holes 3-3 for filtering high temperature flue gas and solids from the outer layer filter. The middle layer filter holes 3-3 and the outer layer filter holes 3-1 are arranged alternately.

[0041] The inner filter is arranged at intervals on the side of the middle filter away from the outer filter, and a second gap layer 3-4 is formed between the middle filter and the inner filter. The inner filter is provided with inner filter holes 3-5 for filtering high-temperature flue gas and solids from the middle filter, and the inner filter holes 3-5 are staggered with the middle filter holes 3-3.

[0042] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the mesh diameter of the outer single-layer filter 2-1 is 3 mm.

[0043] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the outer single-layer filter 2-1 is an open rectangular parallelepiped structure.

[0044] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, each surface of the rectangular structure is evenly distributed with mesh holes.

[0045] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the opening of the rectangular structure has a welding surface 2-2 connected to the box body.

[0046] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the inner multi-layer filter is an open rectangular structure, and mesh holes are provided on one side opposite to the opening.

[0047] In a preferred embodiment of the filter cover for preventing a battery pack explosion-proof valve from catching fire, the rectangular structure is a cube structure.

[0048] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the outer filter layer, the middle filter layer and the inner filter layer are stacked in parallel in sequence.

[0049] In a preferred embodiment of the filter cover for preventing the explosion-proof valve of a battery pack from catching fire, the inner filter is adjacent to the explosion-proof valve pressure relief port 1-2.

[0050] In a preferred embodiment of the filter cover for preventing the battery pack explosion-proof valve from catching fire, the filter cover for preventing the battery pack explosion-proof valve from catching fire is a symmetrical structure.

[0051] In one embodiment, the outer single-layer filter screen 2-1 and the inner multi-layer filter screen structure are not connected to the explosion-proof valve, but are directly connected to the box body to obtain the maximum filtering area, thereby ensuring smooth air flow pressure relief. By increasing the size and area of ​​the filter screen, the filter screen absorbs more flue gas heat, thereby reducing the temperature of the exhaust flue gas. Through the multi-layer filter screen design, solids with a minimum diameter of >3mm are filtered, thereby preventing the inner filter screen holes 3-5 from being blocked and causing poor pressure relief. The inner multi-layer filter screen is designed with a staggered stacking structure, and the gap space between each layer of the filter screen is in a sealed state except for the filter screen holes.

[0052] In one embodiment, Figure 1As shown, the filter cover 1-1 is arranged around the explosion-proof valve pressure relief port 1-2 and connected to the battery box 1-3 by welding. Figure 2 As shown, the outer single-layer filter is composed of a mesh cover with a diameter of 3mm, and its main purpose is to filter solid emissions with a minimum diameter of >3mm to prevent them from clogging the next layer of filter and causing poor pressure relief. Figure 3-4 As shown, the inner multi-layer filter is composed of three layers of 3mm pore size filters stacked in an offset manner. The airflow generated by thermal runaway will directly pass through the outer filter hole 3-1, part of the airflow will directly pass through the middle filter hole 3-3, and another part of the airflow will be retained in the first gap layer 3-2 and then pass through the middle filter hole 3-3 to reach the second gap layer 3-4; similarly, the airflow will also appear in these two modes when passing through the inner filter hole 3-5, directly passing through and passing after being retained in the gap layer. Finally, all gases are collected in the guide space 3-6 and then discharged to the outside of the battery pack through the explosion-proof valve. This kind of filter has a staggered stacking arrangement of air holes, which can block fixed particles smaller than 3mm. At the same time, there is a certain gap between each layer of filter to extend the gas flow path, and the filter absorbs more heat from the flue gas, reducing the gas temperature and the temperature of solid particles. Thereby reducing the risk of solid particles igniting combustible gases.

[0053] like Figure 5 As shown, the high-temperature flue gas and solid particles generated after thermal runaway occurs, and the flue gas and solid particles with a minimum diameter of less than 3mm will enter the space between the outer single-layer filter 2-1 and the inner multi-layer filter 4-1 through the outer filter mesh holes. When the incoming flue gas and solid particles pass through the inner multi-layer offset filter mesh holes, they will be blocked by the filter and absorb a large amount of heat. Finally, the flue gas and solid particles with reduced temperature will be discharged to the outside through the explosion-proof valve pressure relief port 1-2.

[0054] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0055] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A filter cover for preventing a battery pack explosion-proof valve from catching fire, characterized in that: It is installed around the pressure relief port of the explosion-proof valve of the battery pack and fixedly connected to the battery box. The filter cover includes: The outer single-layer filter is fixed to the battery box to filter the high-temperature smoke and solids generated by thermal runaway. The inner multi-layer filter is set in the outer single-layer filter to filter the high-temperature flue gas and solids from the outer single-layer filter for the second time. The inner multi-layer filter includes: The outer filter is adjacent to the outer single-layer filter. The outer filter is provided with outer filter holes for filtering high-temperature flue gas and solids from the outer single-layer filter. The middle filter is arranged at a distance from the outer filter on one side of the outer filter. A first gap layer is formed between the middle filter and the outer filter. The middle filter is provided with middle filter holes for filtering high-temperature flue gas and solids from the outer filter. The middle filter holes are arranged alternately with the outer filter holes. The inner filter is arranged at intervals on the side of the middle filter away from the outer filter, and a second gap layer is formed between the middle filter and the inner filter. The inner filter is provided with inner filter holes for filtering high-temperature flue gas and solids from the middle filter, and the inner filter holes are arranged alternately with the middle filter holes.

2. A filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 1, characterized in that: The mesh diameter of the outer single-layer filter is 3 mm.

3. A filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 1, characterized in that: The outer single-layer filter screen is an open rectangular parallelepiped structure.

4. A filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 3, characterized in that: Each surface of the rectangular parallelepiped structure is evenly distributed with mesh holes.

5. The filter cover for preventing the battery pack explosion-proof valve from catching fire according to claim 3, characterized in that: The opening of the rectangular parallelepiped structure has a welding surface for connecting to the box body.

6. The filter cover for preventing fire of the explosion-proof valve of a battery pack according to claim 1, characterized in that: The inner multi-layer filter screen is an open rectangular structure, and mesh holes are arranged on one side opposite to the open side.

7. A filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 6, characterized in that: The rectangular structure is a cube structure.

8. The filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 1, characterized in that: The outer filter screen, the middle filter screen and the inner filter screen are stacked in parallel and spaced apart in sequence.

9. The filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 1, characterized in that: The inner filter screen is adjacent to the pressure relief port of the explosion-proof valve.

10. The filter cover for preventing a battery pack explosion-proof valve from catching fire according to claim 1, characterized in that: The filter cover for preventing the battery pack explosion-proof valve from catching fire is a symmetrical structure.

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