Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, battery device and electric device, the battery monomer includes: casing, the casing has and communicates with the containing cavity installation mouth, explosion -proof valve, explosion -proof valve is connected with casing and covers the installation mouth, filter screen, filter screen is connected with casing, filter screen is arranged in the explosion -proof valve side away from containing cavity, and the explosion -proof valve cover is arranged in. According to the battery monomer of the utility model, can effectively avoid the explosion when battery monomer thermal runaway, thereby effectively improve the reliability of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] The battery pack is a key component of new energy vehicles. It comprises multiple individual battery cells, each of which can experience thermal runaway under conditions of mechanical, electrical, or thermal abuse. Each battery cell is typically equipped with an explosion-proof valve. When thermal runaway occurs in a single cell and the pressure inside exceeds the preset pressure of the explosion-proof valve, the valve releases pressure to prevent the cell from exploding.

[0003] When an explosion-proof valve releases pressure, it ejects a large amount of high-temperature fumes, which include both gases and particulate matter. When these fumes are ejected, these particles may splash onto other individual cells that have not yet experienced thermal runaway, causing an arcing effect and leading to localized micro-short circuits that can trigger thermal runaway. Current technology typically integrates filters into the explosion-proof valve for filtration; however, the small filtration area can hinder pressure release, thus affecting battery reliability. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a battery cell that can effectively prevent explosion during thermal runaway, thereby effectively improving the reliability of the battery cell.

[0005] This utility model also proposes a battery device having the above-mentioned battery cells.

[0006] This utility model also proposes an electrical device having the above-mentioned battery device.

[0007] According to a first aspect of the present invention, a battery cell includes: a housing having a receiving cavity and an installation port communicating with the receiving cavity; an explosion-proof valve connected to the housing and covering the installation port; and a filter connected to the housing, the filter being arranged on the side of the explosion-proof valve away from the receiving cavity and the explosion-proof valve being covered therein.

[0008] According to the present invention, by arranging the filter screen on the side of the explosion-proof valve away from the receiving cavity and connecting the filter screen to the housing to cover the explosion-proof valve, the explosion of the battery cell during thermal runaway can be effectively avoided, thereby effectively improving the reliability of the battery cell.

[0009] In some embodiments, the periphery of the filter screen is connected to the outer surface of the housing, and the middle portion of the filter screen is spaced apart from the outer surface of the housing to house the explosion-proof valve.

[0010] In some embodiments, in the depth direction of the mounting port, the distance between the portion of the filter screen facing the explosion-proof valve and the explosion-proof valve is greater than or equal to 15 mm and less than or equal to 30 mm.

[0011] In some embodiments, the filter screen includes a sidewall and a bottom wall, the sidewall extending along the depth direction of the mounting opening and extending in a ring shape along the circumference of the mounting opening, the bottom wall covering the side of the sidewall opposite to the mounting opening, wherein filter holes are provided on both the sidewall and the bottom wall.

[0012] In some embodiments, the distance between the filter screen and the surface of the housing gradually decreases in a radial direction from the mounting port outwards.

[0013] In some embodiments, the pore size of the filter screen is 0.1mm-3mm.

[0014] In some embodiments, the filter screen includes a plurality of filter layers arranged along the depth direction of the mounting port, and the pore size of the plurality of filter layers increases sequentially in the depth direction of the mounting port and in a direction gradually moving away from the receiving cavity.

[0015] In some embodiments, the filter screen includes two filter layers, namely a first filter layer and a second filter layer, wherein the first filter layer is located on the side of the second filter layer opposite to the receiving cavity, wherein the pore size of the first filter layer is 2mm-3mm, and the pore size of the second filter layer is 0.5mm-1mm.

[0016] In some embodiments, in the depth direction of the mounting port, the distance between the portions of two adjacent filter layers facing the mounting port is less than or equal to 5 mm.

[0017] In some embodiments, the filter screen is a metal part, and / or the heat resistance temperature of the filter screen is greater than or equal to 500°C.

[0018] In some embodiments, the filter screen is snap-fitted to the housing, welded to it, or bolted to it.

[0019] In some embodiments, the filter screen has a lug extending away from the mounting opening on the surface of the housing along its periphery. The lug has a first fixing hole, and the housing has a second fixing hole. The filter screen is fixed to the housing by fasteners passing through the first fixing hole and the second fixing hole.

[0020] In some embodiments, the number of lugs is multiple, and the multiple lugs are arranged at intervals along the circumference of the filter screen.

[0021] The battery device according to the second aspect of the present invention includes a battery cell according to the first aspect of the present invention.

[0022] According to the battery device of the second aspect of the present invention, by setting the battery cell of the first aspect, it is possible to effectively avoid the explosion of the battery cell when thermal runaway occurs, thereby effectively improving the reliability of the battery device.

[0023] The electrical device according to the third aspect of the present invention includes the battery device according to the second aspect of the present invention.

[0024] According to the third aspect of the present invention, by providing the battery device of the second aspect, the explosion of the battery cell during thermal runaway can be effectively avoided, thereby effectively improving the reliability of the electrical device.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a filter screen according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a battery device according to an embodiment of the present utility model; Figure 3 yes Figure 2 A partial enlarged view of the battery device in the image; Figure 4 This is a cross-sectional view of the battery device according to an embodiment of the present utility model from one angle; Figure 5 This is a cross-sectional view of the battery device according to an embodiment of the present utility model from another angle; Figure 6 yes Figure 5 A magnified view of a portion of the battery device.

[0027] Figure label: 1000. Battery device; 100. Battery cell; 10. Filter screen; 11. Side wall; 12. Bottom wall; 13. Filter holes; 14. Lug.

[0028] 20. Housing; 21. Mounting port. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] The following is for reference. Figures 1-6 A battery cell 100 according to a first aspect embodiment of the present invention is described.

[0031] like Figures 1-3 As shown, the battery cell 100 according to the first aspect of the present invention includes: a housing 20, an explosion-proof valve, and a filter 10.

[0032] The housing 20 has a receiving cavity and an installation port 21 communicating with the receiving cavity; the explosion-proof valve is connected to the housing 20 and covers the installation port 21; the filter screen 10 is connected to the housing 20, and the filter screen 10 is arranged on the side of the explosion-proof valve away from the receiving cavity, and the explosion-proof valve is covered inside.

[0033] In some specific examples, the battery cell 100 also includes a battery cell, which is disposed in the receiving cavity of the housing 20. The mounting port 21 is disposed on the upper side of the housing 20 and communicates with the receiving cavity of the housing 20. Furthermore, the explosion-proof valve seals and covers the mounting port 21. The explosion-proof valve can rupture or open as designed when the internal pressure of the battery cell 100 rises abnormally, releasing the high-pressure gas inside the battery cell 100 and preventing the housing 20 from exploding violently.

[0034] For example Figure 2 As shown, the filter screen 10 is fixedly connected to the housing 20, and the filter screen 10 is located outside the explosion-proof valve. The filter screen 10 covers the explosion-proof valve inside. That is to say, when the battery cell 100 thermally runs away, the high-temperature flue gas generated first passes through the explosion-proof valve and then through the filter screen 10. The filter screen 10 can filter, block or cool the ejected solid particles and larger flames, preventing them from being directly sprayed into the external environment, thereby reducing the danger of thermal runaway of the battery cell 100.

[0035] It should be noted that during thermal runaway of a single battery cell, the main gases produced are combustible gases such as H2, CO, CH4, and C2H4, and the main solid particles produced are molten aluminum beads. In the initial stage of combustible gas emission (within 2 cm of the explosion-proof valve orifice), the combustible gas is in a bundle shape and not fully mixed with air. Even if the temperature of the molten aluminum beads is very high, there is insufficient oxygen to cause deflagration. In the middle and later stages of combustible gas emission (more than 2 cm from the explosion-proof valve orifice), the emitted gas gradually diffuses into a funnel shape and then disperses, mixing fully with air. At this point, if it encounters a spark or a high-temperature molten aluminum bead, deflagration may occur.

[0036] In this embodiment, when the battery cell 100 experiences thermal runaway, the high-temperature gas, flame, molten metal particles, or solid fragments released from inside the battery cell 100 first pass through the pressure relief channel of the explosion-proof valve, and then through the filter screen 10. The filter screen 10 can intercept, block, or cool the ejected solid particles and larger flames, preventing the high-temperature solid particles from coming into contact with the flammable gas that has been fully mixed with air, thereby reducing the risk of open flame and deflagration.

[0037] Furthermore, compared to existing technologies that place the filter 10 inside the housing 20 or integrate it into the explosion-proof valve, this application places the filter 10 outside the housing 20 of the battery cell 100 and covers the outside of the explosion-proof valve. This effectively increases the filtration area of ​​the filter 10, preventing clogging and thus avoiding rupture or even explosion of the housing 20 of the battery cell 100 due to poor ventilation. Therefore, the battery cell 100 of this application meets both flame-retardant and ventilation requirements.

[0038] According to the embodiment of the present utility model, the battery cell 100 can effectively prevent the battery cell 100 from exploding when thermal runaway by arranging the filter screen 10 on the side of the explosion-proof valve away from the receiving cavity, and connecting the filter screen 10 to the housing 20 and covering the filter screen 10, thereby effectively improving the reliability of the battery cell 100.

[0039] In one embodiment of this utility model, such as Figure 4 As shown, the periphery 101 of the filter 10 (e.g.) Figure 4 The sidewall 11 of the filter screen 10 shown (facing the housing 20 at one end) is connected to the outer surface of the housing 20, and the middle portion 102 of the filter screen 10 (e.g. Figure 4 The bottom wall 12 of the filter screen 10 shown is spaced apart from the outer surface of the housing 20 to house the explosion-proof valve cover.

[0040] In some specific examples, such as Figure 4 As shown, the lower periphery 101 of the filter screen 10 is connected to the upper side of the housing 20, thereby ensuring the overall stability of the filter screen 10, preventing the filter screen 10 from falling off during normal operation or thermal runaway of the battery cell 100, and ensuring the reliability of the protective function of the filter screen 10.

[0041] Furthermore, the middle part 102 of the filter screen 10 maintains a certain distance from the upper side of the housing 20, forming a gap. This allows the filter screen 10 to completely cover the explosion-proof valve. When the explosion-proof valve ruptures, the high-pressure gas and ejected material inside the battery cell 100 will rush out instantly. The gap between the middle part of the filter screen 10 and the outer surface of the housing 20 can provide initial buffering and expansion space for these ejected materials, thereby effectively reducing the initial impact velocity and pressure of the ejected materials, allowing them to contact and pass through the filter screen 10 more smoothly, thus improving the filtration efficiency.

[0042] In this embodiment, by connecting the periphery of the filter screen 10 to the outer surface of the housing 20 and separating the middle part of the filter screen 10 from the outer surface of the housing 20, the explosion-proof valve cover is housed inside. This not only effectively improves the stability of the filter screen 10, but also effectively enhances the filtration efficiency of the filter screen 10.

[0043] In one embodiment of this utility model, in the depth direction of the mounting opening 21 (e.g.) Figure 4 and Figure 6 In the vertical direction shown, the distance between the part of the filter screen 10 directly opposite the explosion-proof valve and the explosion-proof valve is greater than or equal to 15mm and less than or equal to 30mm.

[0044] For example, the distance between the portion of the filter 10 facing the explosion-proof valve and the explosion-proof valve can be 15mm, 18mm, 21mm, 24mm, 27mm, or 30mm. Setting the distance between the portion of the filter 10 facing the explosion-proof valve and the explosion-proof valve to be greater than or equal to 15mm can prevent the distance from being too small, thus effectively buffering high-pressure ejected materials and effectively preventing the filter 10 from melting or clogging due to local overheating. Setting the distance between the portion of the filter 10 facing the explosion-proof valve and the explosion-proof valve to be less than or equal to 30mm can effectively control the installation space occupied by the filter 10, thereby making the structure of the battery cell 100 more compact.

[0045] In this embodiment, the distance between the part of the filter screen 10 facing the explosion-proof valve and the explosion-proof valve in the depth direction of the installation port 21 is set to be greater than or equal to 15mm and less than or equal to 30mm. This not only effectively buffers the high-pressure ejected material and effectively avoids damage and blockage of the filter screen 10, but also makes the structure of the battery cell 100 more compact and reduces the space occupied by the battery cell 100.

[0046] In one embodiment of this utility model, such as Figure 1 and Figure 4 As shown, the filter screen 10 includes a side wall 11 and a bottom wall 12. The side wall 11 extends along the depth direction of the mounting opening 21 and extends in a ring shape along the circumference of the mounting opening 21. The bottom wall 12 covers the side of the side wall 11 opposite to the mounting opening 21. Both the side wall 11 and the bottom wall 12 are provided with filter holes 13.

[0047] In some specific examples, such as Figure 1 and Figure 4As shown, the depth direction of the mounting opening 21 is vertical, and the sidewall 11 extends vertically and is annular around the mounting opening 21. Further, the cross-sectional shape of the sidewall 11 can be polygonal, circular, elliptical, or oblong. The bottom wall 12 is connected to the top of the sidewall 11 and is used to cover the end of the sidewall 11 facing away from the housing 20. Both the sidewall 11 and the bottom wall 12 are provided with filter holes 13. This means that the high-pressure ejected material emitted during thermal runaway of the battery cell 100 can pass through the filter holes 13 on the sidewall 11 and bottom wall 12 of the filter screen 10, thereby effectively enhancing the filtration efficiency.

[0048] In this embodiment, a side wall 11 and a bottom wall 12 are provided in the filter screen 10. The side wall 11 extends along the depth direction of the mounting opening 21 and extends in a ring shape along the circumference of the mounting opening 21. The bottom wall 12 covers the side of the side wall 11 opposite to the mounting opening 21. Both the side wall 11 and the bottom wall 12 are provided with filter holes 13, so that the high-pressure ejected material emitted by the battery cell 100 during thermal runaway can pass through the filter screen 10 from multiple directions, thereby achieving multi-directional filtration, effectively increasing the filtration area and enhancing the filtration efficiency.

[0049] In one embodiment of the present invention, the distance between the filter screen 10 and the surface of the housing 20 gradually decreases in the radial direction from the mounting port 21 from the inside to the outside.

[0050] In other words, the distance between the center of the filter screen 10 and the surface of the housing 20 is the greatest, and the distance between the filter screen 10 and the surface of the housing 20 decreases towards the edge of the filter screen 10. For example, the filter screen 10 can be arc-shaped or corrugated. When the battery cell 100 experiences thermal runaway, the ejected material is ejected from the center of the explosion-proof valve and first impacts the center of the filter screen 10 (where the distance is the greatest), and then spreads outward along the inner wall of the filter screen 10. This avoids causing local high pressure on the filter screen 10, achieves a more uniform pressure relief distribution, and effectively increases the contact area between the ejected material and the filter screen 10.

[0051] In this embodiment, the distance between the filter screen 10 and the surface of the housing 20 is gradually reduced in the radial direction from the mounting port 21 outward. This can prevent the ejected material from the battery cell 100 from causing local high pressure on the filter screen 10 during thermal runaway, effectively protect the filter screen 10, and effectively increase the contact area between the ejected material and the filter screen 10, thereby enhancing the filtration efficiency.

[0052] In one embodiment of this utility model, the pore size of the filter 10 is 0.1mm-3mm.

[0053] For example, the pore size of the filter 10 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. It should be noted that when the battery cell 100 in this application experiences thermal runaway, the ejected material contains molten lithium metal, carbon particles, positive electrode fragments, metal splashes, etc. The particle size of these solid particles is mostly in the range of 0.1-2 mm. Therefore, setting the pore size of the filter 10 to 0.1 mm-3 mm can not only effectively intercept dangerous particles in the ejected material, but also ensure the rapid pressure relief capability of the filter 10.

[0054] In this embodiment, by setting the pore size of the filter screen 10 to 0.1mm-3mm, when the battery cell 100 experiences thermal runaway, it can effectively intercept particles in the ejected material while ensuring the pressure relief capacity of the filter screen 10, thus preventing the casing 20 from rupturing or exploding due to excessive pressure, thereby improving the safety of the battery cell 100.

[0055] In one embodiment of this utility model, the filter 10 includes multiple filter layers arranged along the depth direction of the mounting opening 21, and gradually moving away from the receiving cavity in the depth direction of the mounting opening 21 (e.g., ...). Figure 1 and Figure 2 In the direction from bottom to top, the pore size of multiple filter layers increases sequentially.

[0056] In some specific examples, such as Figure 1 and Figure 2 As shown, multiple filter layers are arranged vertically, with the pore size of each layer increasing sequentially from bottom to top. In other words, the multiple filter layers form a three-dimensional stacked structure in the vertical direction, with the bottommost filter layer having the smallest pore size and the topmost filter layer having the largest pore size.

[0057] When the battery cell 100 experiences thermal runaway, the ejected flame front produces two effects as it passes through multiple filter layers: first, the wall effect, where the ejected flame contacts multiple filter layers, causing heat dissipation; and second, the quenching effect, where the filter holes 13 on the multiple filter layers can divide the flame and reduce the combustion reaction temperature. Under the combined effect of these two effects, the flame propagation speed falls below the critical quenching speed, thus terminating the combustion reaction itself.

[0058] This embodiment provides multiple filter layers in the filter screen 10. These multiple filter layers are arranged along the depth direction of the mounting port 21, and the pore size of the multiple filter layers increases sequentially in the depth direction of the mounting port 21 and gradually away from the receiving cavity. This can effectively reduce the risk of open flame and deflagration.

[0059] In one embodiment of the present invention, the filter 10 includes two filter layers, namely a first filter layer and a second filter layer. The first filter layer is located on the side of the second filter layer away from the receiving cavity. The pore size of the first filter layer is 2mm-3mm, and the pore size of the second filter layer is 0.5mm-1mm.

[0060] In some specific examples, the first filter layer is located above the second filter layer, and the pore size of the first filter layer is 2mm-3mm, while the pore size of the second filter layer is 0.5mm-1mm. For example, the pore size of the first filter layer can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm. The pore size of the second filter layer can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. That is, the pore size of the first filter layer is larger than that of the second filter layer.

[0061] This embodiment provides two filter layers in the filter screen 10, namely a first filter layer and a second filter layer. The first filter layer is located on the side of the second filter layer away from the receiving cavity. The pore size of the first filter layer is 2mm-3mm, and the pore size of the second filter layer is 0.5mm-1mm. This effectively simplifies the structure of the filter screen 10, reduces the manufacturing difficulty of the filter screen 10, and effectively saves the cost of the filter screen 10 while ensuring its reliability.

[0062] In one embodiment of the present invention, in the depth direction of the mounting port 21, the distance between the portions of two adjacent filter layers that are directly opposite the mounting port 21 is less than or equal to 5 mm.

[0063] For example, in the vertical direction, the distance between the portions of two adjacent filter layers facing the mounting port 21 can be 0mm, 1mm, 2mm, 3mm, 4mm, or 5mm. That is, two adjacent filter layers can be bonded together or arranged with gaps between them. Bonding two adjacent filter layers together can effectively improve the compactness of the filter screen 10, while arranging two adjacent filter layers with gaps between them can allow for brief expansion, deceleration, and partial cooling of the high-temperature ejected material in the interlayer gaps, thereby effectively reducing the impact intensity of the high-temperature ejected material.

[0064] In this embodiment, the spacing between the portions of two adjacent filter layers facing the mounting port 21 in the depth direction is set to 0mm-5mm. This effectively ensures the compactness of the filter screen 10 structure and effectively reduces the impact strength of the high-temperature ejected material, thereby effectively extending the service life of the filter screen 10.

[0065] In one embodiment of this utility model, the filter screen 10 is a metal part, and / or the heat resistance temperature of the filter screen 10 is greater than or equal to 500°C.

[0066] For example, filter screen 10 is a metal part, and further, filter screen 10 can be a stainless steel part; for another example, the heat resistance temperature of filter screen 10 is greater than or equal to 500℃; for yet another example, filter screen 10 is a metal part and the heat resistance temperature of filter screen 10 is greater than or equal to 500℃, for example, the heat resistance temperature of filter screen 10 can be 500℃, 550℃, 600℃, 650℃ or 700℃.

[0067] In this embodiment, by setting the filter screen 10 as a metal part, the structural strength and rigidity of the filter screen 10 can be effectively increased, thereby effectively improving the durability of the filter screen 10; by setting the heat resistance temperature of the filter screen 10 to greater than or equal to 500℃, the high temperature resistance performance of the filter screen 10 can be effectively improved, and the filter screen 10 can be prevented from failing.

[0068] In one embodiment of this utility model, such as Figure 2 As shown, the filter screen 10 is connected to the housing 20 by snap-fit, welding, or bolts.

[0069] This embodiment simplifies the connection between the filter screen 10 and the housing 20 by setting the connection method to snap-fit ​​connection, welding connection or bolt connection, thereby simplifying the assembly process of the filter screen 10 and improving the assembly efficiency of the filter screen 10.

[0070] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the filter screen 10 has a lug 14 extending from the mounting opening 21 on the surface of the housing 20 around its periphery. The lug 14 has a first fixing hole, and the housing 20 has a second fixing hole. The filter screen 10 is fixed to the housing 20 by fasteners passing through the first fixing hole and the second fixing hole.

[0071] In some specific examples, such as Figure 2 and Figure 3 As shown, one end of the lug 14 is connected to the side wall 11 of the filter screen 10, and the other end of the lug 14 has a first fixing hole that penetrates the lug 14 along its thickness direction. The housing 20 has a second fixing hole, and fasteners are inserted into the first and second fixing holes to fix the filter screen 10 to the housing 20. In other words, the filter screen 10 and the battery cell 100 are detachably connected, and the filter screen 10 can be manufactured independently without altering the structure of the battery cell 100. Furthermore, the filter screen 10 can be adapted to various square battery cells 100, thereby effectively improving the applicability of the filter screen 10.

[0072] In this embodiment, a lug 14 extending away from the mounting opening 21 is provided on the periphery of the filter screen 10 on the surface of the housing 20. The lug 14 is provided with a first fixing hole, and the housing 20 is provided with a second fixing hole. The filter screen 10 is fixed to the housing 20 by fasteners passing through the first fixing hole and the second fixing hole, so that the filter screen 10 and the battery cell 100 can be detachably connected, thereby facilitating the production and assembly of the filter screen 10. In addition, it can also effectively improve the applicability of the filter screen 10.

[0073] In one embodiment of this utility model, there are multiple lugs 14, which are arranged at intervals along the circumference of the filter screen 10. For example, the number of lugs 14 can be two, three, four, five, or more than six, and the multiple lugs 14 are arranged at intervals along the circumference of the filter screen 10.

[0074] In this embodiment, by setting the number of lugs 14 to multiple, and arranging multiple lugs 14 at intervals along the circumference of the filter screen 10, it is possible to avoid damage to a single lug 14 due to excessive force, thereby effectively increasing the durability of the lugs 14. In addition, multiple lugs 14 arranged at intervals along the circumference of the filter screen 10 can also enhance the overall stability of the filter screen 10 and prevent the filter screen 10 from shaking.

[0075] like Figure 2 As shown, the battery device 1000 according to the second aspect embodiment of the present invention includes a battery cell 100 according to the first aspect embodiment of the present invention.

[0076] According to the battery device 1000 of the present utility model embodiment, by providing the battery cell 100 of the first aspect embodiment described above, it is possible to effectively prevent the battery cell 100 from exploding when it undergoes thermal runaway, thereby effectively improving the reliability of the battery device 1000.

[0077] The electrical device according to a third aspect of the present invention includes a battery device 1000 according to the second aspect of the present invention described above.

[0078] According to the embodiments of the present invention, by providing the battery device 1000 of the second aspect embodiment, the electrical device can effectively prevent the explosion of the battery cell 100 in the event of thermal runaway, thereby effectively improving the reliability of the electrical device.

[0079] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0081] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, include: A housing (20) having a receiving cavity and a mounting port (21) communicating with the receiving cavity; An explosion-proof valve, which is connected to the housing (20) and covers the mounting port (21); A filter screen (10) is connected to the housing (20). The filter screen (10) is arranged on the side of the explosion-proof valve away from the receiving cavity and covers the explosion-proof valve inside.

2. The battery cell (100) according to claim 1, characterized in that, The periphery of the filter screen (10) is connected to the outer surface of the housing (20), and the middle part of the filter screen (10) is spaced apart from the outer surface of the housing (20) to cover the explosion-proof valve.

3. The battery cell (100) according to claim 2, characterized in that, In the depth direction of the mounting port (21), the distance between the portion of the filter screen (10) directly opposite the explosion-proof valve and the explosion-proof valve is greater than or equal to 15 mm and less than or equal to 30 mm.

4. The battery cell (100) according to claim 2, characterized in that, The filter screen (10) includes a side wall (11) and a bottom wall (12). The side wall (11) extends along the depth direction of the mounting port (21) and extends in a ring shape along the circumference of the mounting port (21). The bottom wall (12) covers the side of the side wall (11) opposite to the mounting port. Both the side wall (11) and the bottom wall (12) are provided with filter holes (13).

5. The battery cell (100) according to claim 2, characterized in that, In a radial direction from the inside to the outside from the mounting port (21), the distance between the filter screen (10) and the surface of the housing gradually decreases.

6. The battery cell (100) according to any one of claims 1-5, characterized in that, The filter screen (10) has a pore size of 0.1 mm to 3 mm.

7. The battery cell (100) according to any one of claims 1-5, characterized in that, The filter (10) includes multiple filter layers arranged along the depth direction of the mounting port (21), and the pore size of the multiple filter layers increases sequentially in the depth direction of the mounting port (21) and in the direction that gradually moves away from the receiving cavity.

8. The battery cell (100) according to claim 7, characterized in that, The filter (10) includes two filter layers, namely a first filter layer and a second filter layer. The first filter layer is located on the side of the second filter layer away from the receiving cavity. The pore size of the first filter layer is 2mm-3mm, and the pore size of the second filter layer is 0.5mm-1mm.

9. The battery cell (100) according to claim 7, characterized in that, In the depth direction of the mounting port (21), the distance between the portions of two adjacent filter layers that are directly opposite the mounting port (21) is less than or equal to 5 mm.

10. The battery cell (100) according to any one of claims 1-5, characterized in that, The filter screen (10) is a metal part, and / or the heat resistance temperature of the filter screen (10) is greater than or equal to 500°C.

11. The battery cell (100) according to any one of claims 1-5, characterized in that, The filter screen (10) is connected to the housing (20) by snap-fit, welding, or bolt.

12. The battery cell (100) according to any one of claims 1-5, characterized in that, The filter screen (10) has a lug (14) extending from the mounting port (21) on the surface of the housing (20) around its periphery. The lug (14) has a first fixing hole, and the housing (20) has a second fixing hole. The filter screen (10) is fixed to the housing (20) by fasteners passing through the first fixing hole and the second fixing hole.

13. The battery cell (100) according to claim 12, characterized in that, The number of lugs (14) is multiple, and the multiple lugs (14) are arranged at intervals along the circumference of the filter screen (10).

14. A battery device (1000), characterized in that, Includes the battery cell (100) according to any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device (1000) according to claim 14.

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