Battery apparatus and electric device

Abstract

The present application relates to a battery apparatus and an electric device. The battery apparatus comprises: a case provided with an accommodating cavity; and a battery cell provided in the accommodating cavity; the battery cell is provided with an explosion-proof valve; a protective portion is provided on a cavity wall of the accommodating cavity; and the protective portion corresponds to the explosion-proof valve, and is configured to be capable of blocking a high-temperature medium sprayed out of the explosion-proof valve. In the present application, when a high-temperature medium is sprayed out of an explosion-proof valve, a protective portion can block the high-temperature medium to a certain extent, thereby reducing the direct impact of the high-temperature medium on a case. In addition, when the high-temperature medium is in contact with the protective portion, the high-temperature medium is dispersed under the blocking action of the protective portion, so that the probability that the high-temperature medium agglomerates on a cavity wall of an accommodating cavity is reduced, thereby reducing the probability that the high-temperature medium damages the case, and thus effectively protecting the structure of the case.

Description

Battery devices and electrical equipment Related applications

[0001] This application claims priority to Chinese patent application No. 2024118540703, filed on December 16, 2024, entitled "Battery Device and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0003] During cyclic use, individual battery cells generate heat and gas internally. When the internal temperature or pressure of a battery cell reaches a certain threshold, the explosion-proof valve on the battery cell opens, and the high-temperature medium inside the battery cell is ejected from the valve. At this time, the high-temperature medium sprayed onto the casing can easily damage the casing structure, thereby damaging the overall structure of the battery pack. Summary of the Invention

[0004] Based on this, this application provides a battery device and an electrical appliance.

[0005] In a first aspect, this application provides a battery device, including a housing and a battery cell. The housing has a receiving cavity; the battery cell is disposed in the receiving cavity and is provided with an explosion-proof valve; wherein, the cavity wall of the receiving cavity has a protective part, which corresponds to the explosion-proof valve and is configured to block the high-temperature medium ejected from the explosion-proof valve.

[0006] With the above structure, when the high-temperature medium is sprayed out from the explosion-proof valve, the protective part can form a certain blockage of the high-temperature medium, reduce the direct impact of the high-temperature medium on the enclosure, thereby reducing the probability of the high-temperature medium causing damage to the enclosure and effectively protecting the enclosure structure.

[0007] In some embodiments, the surface of the protective part facing the explosion-proof valve is non-planar. Therefore, when the high-temperature medium comes into contact with the protective part, the high-temperature medium flows along the convex or concave shape, thereby dispersing the high-temperature medium and reducing the probability of it agglomerating on the cavity wall.

[0008] In some embodiments, the protective portion is recessed on the surface facing away from the explosion-proof valve. This recessed structure allows for better dispersion of the high-temperature medium, further reducing the probability of agglomeration.

[0009] In some embodiments, the protective part protrudes from the cavity wall of the receiving cavity, and the surface of the protective part facing the explosion-proof valve is recessed to form a groove, the diameter of the groove gradually increasing from the bottom wall to the opening.

[0010] Through the above structure, the protective part can provide more stable protection for the enclosure, and the groove structure can facilitate the smooth dispersion and flow of the high-temperature medium, reducing the probability of the high-temperature medium forming agglomeration on the enclosure, and further protecting the enclosure structure.

[0011] In some embodiments, the groove is configured as an arcuate groove with its opening facing the explosion-proof valve.

[0012] The above structure allows the high-temperature medium to flow more smoothly along the arc-shaped groove when it comes into contact with the inner wall of the groove, thereby reducing the probability of the high-temperature medium forming agglomeration at the center and effectively protecting the structure of the box.

[0013] In some embodiments, the projection of the explosion-proof valve toward the cavity wall where the protective part is located is located within the projection of the groove onto the cavity wall.

[0014] Therefore, when the high-temperature medium is ejected from the explosion-proof valve, the groove provides a larger shielding area for the medium, effectively protecting the structure of the enclosure. Simultaneously, the groove completely covers the top of the explosion-proof valve, allowing the high-temperature medium to flow smoothly along the inner wall of the groove, further protecting the enclosure.

[0015] In some embodiments, in the width direction of the battery cell, the width of the groove is L, the length of the explosion-proof valve is D, and the maximum ejection angle when the explosion-proof valve is fully open is Θ; in the height direction of the battery cell, the distance between the lowest point of the groove bottom wall and the explosion-proof valve is H; wherein, L≥H·tanΘ+1 / 2D.

[0016] Therefore, by providing a suitable venting gap for the battery cells, the groove can better protect the high-temperature medium ejected from the explosion-proof valve and better protect the casing structure.

[0017] In some embodiments, the protective part includes a body protruding from the cavity wall of the receiving cavity, and the surface of the body facing the explosion-proof valve is recessed to form a groove; wherein the body is constructed as a high-temperature resistant metal body.

[0018] In some embodiments, the protective part includes a body protruding from the cavity wall of the receiving cavity, and the surface of the body facing the explosion-proof valve is recessed to form a groove; wherein the body is constructed as a high-temperature resistant ceramic body.

[0019] Through the above structure, the main body can better block high-temperature media, thereby protecting the enclosure and effectively protecting the enclosure structure.

[0020] In some embodiments, the protective portion further includes a high-temperature resistant coating applied to the inner surface of the groove.

[0021] By applying a high-temperature resistant coating, the protection against high-temperature media can be further improved. Furthermore, the high-temperature resistant coating makes the surface of the main body smoother, reducing the probability of high-temperature media remaining in the grooves and better protecting the enclosure structure.

[0022] In some embodiments, the high-temperature resistant coating includes aluminum oxide.

[0023] In some embodiments, the high-temperature resistant coating comprises silicon dioxide.

[0024] Therefore, high-temperature resistant coatings not only improve the protection against high-temperature media, but also have good insulation properties.

[0025] In some embodiments, a battery cell includes multiple battery cells, and multiple battery cells in all battery cells are arranged along the thickness direction to form a battery cell group, and multiple battery cell groups are arranged sequentially along the width direction; each battery cell is provided with an explosion-proof valve, and the protective part includes multiple protective parts, each protective part is extended along the thickness direction, and each protective part is corresponding to each explosion-proof valve of one of the battery cell groups.

[0026] Through the above structure, the protective part can simultaneously protect multiple explosion-proof valves, thus better protecting the overall structure of the battery device without significantly affecting the overall energy density of the battery device.

[0027] Secondly, this application also provides an electrical device, including the battery device described above.

[0028] The aforementioned battery device and electrical equipment have a protective section installed on the cavity wall of the receiving chamber, corresponding to the explosion-proof valve. In this way, when the high-temperature medium is ejected from the explosion-proof valve, the protective section can block the high-temperature medium to a certain extent, reducing the direct impact of the high-temperature medium on the enclosure. In addition, when the high-temperature medium comes into contact with the protective section, the high-temperature medium will be dispersed under the blocking effect of the protective section, thereby reducing the probability of the high-temperature medium agglomerating on the cavity wall of the receiving chamber, thus reducing the probability of the high-temperature medium damaging the enclosure and effectively protecting the enclosure structure. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the structure of a battery device according to one or more embodiments.

[0031] Figure 2 is a partial cross-sectional view of a battery device according to one or more embodiments.

[0032] Figure 3 is a partial schematic diagram of the housing in a battery device according to one or more embodiments.

[0033] Explanation of reference numerals in the attached drawings: 100, battery device; 10, housing; 20, individual battery cell; 30, receiving cavity; 40, protective part; 21, explosion-proof valve; 41, groove; 42, main body; 43, high-temperature resistant coating; a, width direction; b, height direction; c, thickness direction. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0041] A battery cell is the smallest unit that makes up a battery. A battery cell typically includes a casing, a top cover, and electrode components. The casing and top cover enclose a space to house the electrode components, thus protecting them.

[0042] During the cycle of use, the main process in a battery cell involves electrochemical reactions in the electrode components, which generate a large amount of heat and gas. When the temperature or pressure inside the battery cell reaches a certain threshold, the explosion-proof valve on the battery cell will open, allowing the high-temperature medium inside the battery cell to be ejected from the valve, thereby relieving pressure.

[0043] When individual battery cells are placed inside the enclosure, high-temperature media can easily spray out from the explosion-proof valve and onto the side wall of the enclosure. Under the high temperature or pressure of this media, the enclosure structure can be easily damaged, thus compromising the overall structure of the battery pack.

[0044] Furthermore, with the development of battery devices, the requirements for energy density are becoming increasingly stringent. In other words, current battery devices possess higher energy densities. For example, lithium metal batteries, which use lithium metal as the negative electrode material, are gaining wider application due to their inherent high energy density.

[0045] Taking lithium metal batteries as an example, when a single battery cell experiences thermal runaway, the reaction speed is fast and the reaction intensity is high. Furthermore, the high-temperature molten metal flow ejected from the explosion-proof valve has high temperature, high speed, and strong reducing properties, which will cause more severe and rapid damage to the casing.

[0046] Therefore, there is a need to provide a battery device with better protection without significantly affecting the overall energy density in order to meet the higher requirements for battery devices in the future.

[0047] Based on the above considerations, to address the issue of high-temperature media ejected from the battery cell from the explosion-proof valve potentially damaging the casing structure, one or more embodiments of this application provide a battery device with a protective section disposed on the cavity wall of the receiving chamber and corresponding to the explosion-proof valve. This allows the protective section to provide some obstruction when the high-temperature media is ejected from the explosion-proof valve, reducing the direct impact of the high-temperature media on the casing. Furthermore, when the high-temperature media comes into contact with the protective section, it is dispersed, thereby reducing the probability of the high-temperature media agglomerating on the cavity wall and further reducing the probability of damage to the casing, effectively protecting the casing structure.

[0048] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0049] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0050] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0051] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0052] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0053] Referring to Figures 1 and 2, one embodiment of this application provides a battery device 100, including a housing 10 and a battery cell 20. The housing 10 has a receiving cavity 30. The battery cell 20 is disposed within the receiving cavity 30, and an explosion-proof valve 21 is provided on the battery cell 20. The cavity wall of the receiving cavity 30 has a protective portion 40, which corresponds to the explosion-proof valve 21 and is configured to block the high-temperature medium ejected from the explosion-proof valve 21.

[0054] It should be noted that the housing 10 refers to a structure that can provide housing space and a certain degree of protection for the battery cell 20 or other functional components in the battery device 100. The housing 10 typically includes a housing body and a cover. The housing body includes a bottom plate and side plates surrounding the bottom plate. The housing body has an opening opposite to the bottom plate, and the cover is sealed to the opening, thereby forming a housing cavity 30 together with the housing body.

[0055] The battery cell 20 is the smallest unit that makes up the battery device 100. The battery cell 20 may include one or more cells. All the battery cells 20 are arranged in an array in the receiving cavity 30, and the battery cells 20 are connected to each other by series, parallel or mixed connection.

[0056] The battery cell 20 is typically equipped with an explosion-proof valve 21. The explosion-proof valve 21 is a component that can be actuated to release pressure when the internal temperature and / or air pressure of the battery cell 20 reaches a certain threshold. In other words, when the internal temperature or air pressure of the battery cell 20 is too high, the explosion-proof valve 21 can open to release the pressure of the battery cell 20.

[0057] The battery cell 20 typically includes a housing and a top cover. The housing includes a bottom plate and side plates surrounding the bottom plate. The housing has an opening opposite the bottom plate. The top cover is sealed over the opening to enclose the electrode assembly within the housing and the top cover.

[0058] The explosion-proof valve 21 can be installed on the top cover of the battery cell 20, or on the side plate or bottom plate of the battery cell 20. The specific location of the explosion-proof valve 21 can be set according to actual usage requirements, and will not be elaborated here.

[0059] For ease of understanding, the following explanation will take the example of the explosion-proof valve 21 being installed on the top cover.

[0060] When the battery cell 20 is placed inside the receiving cavity 30, the bottom plate of the battery cell 20 is supported on the bottom wall of the box body, and the explosion-proof valve 21 of the battery cell 20 is positioned facing the cover of the box body 10. At this time, the protective part 40 is provided on the inner surface of the cover and is positioned corresponding to the explosion-proof valve 21, that is, the protective part 40 is located directly above the explosion-proof valve 21.

[0061] Therefore, when the high-temperature medium is ejected from the explosion-proof valve 21, the protective part 40 can form a certain blockage of the high-temperature medium, reduce the direct impact of the high-temperature medium on the housing 10, thereby reducing the probability of the high-temperature medium causing damage to the housing 10 and effectively protecting the structure of the housing 10.

[0062] In some embodiments, the surface of the protective part 40 facing the explosion-proof valve 21 is non-planar.

[0063] Specifically, the lower surface of the protective part 40 can be convex downwards, recessed upwards, or other non-planar structures.

[0064] Therefore, when the high-temperature medium comes into contact with the protective part 40, the high-temperature medium will flow along the convex or concave shape, thereby dispersing the high-temperature medium and reducing the probability of the high-temperature medium agglomerating on the cavity wall of the receiving cavity 30.

[0065] In some embodiments, the protective part 40 is recessed on the surface facing the explosion-proof valve 21 in a direction away from the explosion-proof valve 21.

[0066] Specifically, the lower surface of the protective part 40 is recessed in the direction away from the explosion-proof valve 21, that is, the lower surface of the protective part 40 is recessed inward. In this way, when the high-temperature medium is sprayed out from the explosion-proof valve 21, the protective part 40 can play a certain role in blocking the high-temperature medium, preventing the high-temperature medium from directly impacting the cover of the housing 10, and providing a certain degree of protection for the cover.

[0067] At the same time, when the high-temperature medium comes into contact with the protective part 40, the high-temperature medium will flow along the shape of the recessed part, that is, the high-temperature medium will disperse in all directions. In this way, the probability of the high-temperature medium agglomerating in the center of the cover is reduced, the probability of the cover being melted through by the high-temperature medium is reduced, and the cover is further protected.

[0068] Therefore, the recessed structure can better disperse the high-temperature medium to the surrounding area, further reducing the probability of the high-temperature medium agglomerating.

[0069] In some embodiments, the protective part 40 protrudes from the cavity wall of the receiving cavity 30, and the protective part 40 is recessed on the surface facing the explosion-proof valve 21 to form a groove 41, the diameter of the groove 41 gradually increases from the bottom wall of the groove to the opening of the groove.

[0070] Specifically, the protective part 40 can be integrally formed with the cavity wall of the receiving cavity 30, or it can be separately formed from the cavity wall of the receiving cavity 30. By protruding the protective part 40 onto the cavity wall of the receiving cavity 30, the local thickness of the cavity wall of the receiving cavity 30 can be increased, that is, the local thickness of the cavity wall of the receiving cavity 30 at the position corresponding to the explosion-proof valve 21 can be increased. Therefore, the protective part 40 can better block the high-temperature medium ejected from the explosion-proof valve 21, protecting the structure of the housing 10.

[0071] Furthermore, a groove 41 is formed on the lower surface of the protective part 40 facing the explosion-proof valve 21, with the diameter of the groove 41 gradually increasing from the bottom wall to the opening. Therefore, when the high-temperature medium comes into contact with the groove 41, it will disperse and flow along the bottom wall towards the opening, effectively reducing the probability of the high-temperature medium agglomerating in the center.

[0072] Through the above structure, the protective part 40 can provide more stable protection for the housing 10, and the structure of the groove 41 can facilitate the smooth dispersion and flow of the high-temperature medium, reduce the probability of the high-temperature medium forming a central agglomeration on the housing 10, and further protect the structure of the housing 10.

[0073] In some other embodiments, the cavity wall of the receiving cavity 30 can be thickened as a whole. That is, the thickness of the protective part 40 is consistent with that of other parts of the cavity wall, and a groove 41 is formed at the location of the protective part 40. In this way, the overall thickness of the cover is increased, which can also improve the protection effect against high-temperature media. At the same time, the high-temperature media can flow in a dispersed manner at the groove 41, reducing the probability of high-temperature media agglomeration.

[0074] In some embodiments, the groove 41 is configured as an arcuate groove with its opening facing the explosion-proof valve.

[0075] Specifically, the groove 41 is configured as an arc-shaped groove structure with its opening facing the explosion-proof valve, that is, the inner wall of the groove 41 extends in an arc shape. In this way, when the high-temperature medium comes into contact with the inner wall of the groove 41, it can flow more smoothly along the arc-shaped groove to the surrounding areas, reducing the retention and accumulation of the high-temperature medium inside the groove 41.

[0076] Understandably, in some other embodiments, the groove 41 can also be configured in other shapes, such as a conical groove 41 or a frustum-shaped groove 41, which can also achieve the dispersion and flow of the high-temperature medium, and will not be elaborated here.

[0077] With the above structure, when the high-temperature medium comes into contact with the inner wall of the groove 41, it can flow more smoothly along the arc-shaped groove 41, thereby reducing the probability of the high-temperature medium forming a central agglomeration and effectively protecting the structure of the box 10.

[0078] In some embodiments, the projection of the explosion-proof valve 21 toward the cavity wall where the protective part 40 is located is located within the projection of the groove 41 onto the cavity wall.

[0079] Specifically, the protective part 40 is disposed on the inner surface of the cover, that is, the projection of the explosion-proof valve 21 on the inner surface of the cover is located within the projection of the groove 41 on the inner wall surface of the cover. In other words, the groove 41 completely covers the top of the explosion-proof valve 21.

[0080] Therefore, when the high-temperature medium is ejected from the explosion-proof valve 21, the groove 41 provides a larger shielding range for the high-temperature medium, thus better blocking it and effectively protecting the structure of the housing 10. At the same time, the groove 41 completely covers the top of the explosion-proof valve 21, allowing the high-temperature medium to flow smoothly along the inner wall of the groove 41, further protecting the housing 10.

[0081] In some embodiments, in the width direction a of the battery cell 20, the width of the groove 41 is L, the length of the explosion-proof valve 21 is D, and the maximum ejection angle when the explosion-proof valve 21 is fully open is Θ. In the height direction b of the battery cell 20, the distance between the lowest point of the bottom wall of the groove 41 and the explosion-proof valve 21 is H. Wherein, L≥HtanΘ+1 / 2D.

[0082] Specifically, the battery cell 20 includes a top surface and a bottom surface disposed opposite to each other, and a side surface disposed between the top surface and the bottom surface. The side surface includes a first side surface disposed opposite to each other and a second side surface connecting the two first side surfaces, wherein the area of ​​the first side surface is larger than the area of ​​the second side surface. That is, the first side surface is the larger surface of the battery cell 20.

[0083] The width direction a of the battery cell 20 is perpendicular to the second side, the thickness direction c of the battery cell 20 is perpendicular to the first side, and the height direction b of the battery cell 20 is perpendicular to the top and bottom surfaces.

[0084] In the width direction a of the battery cell 20, the width of the groove 41 is L, the length of the explosion-proof valve 21 is D, and the maximum ejection angle when the explosion-proof valve 21 is fully open is Θ.

[0085] To facilitate the smooth flow of the high-temperature medium along the inner wall of the groove 41, the lowest point of the bottom wall of the groove 41 is typically located at the center of the groove 41. In the height direction b of the battery cell 20, the distance between the lowest point of the bottom wall of the groove 41 and the explosion-proof valve 21 is H. Where L ≥ H·tanΘ + 1 / 2D.

[0086] Therefore, based on providing a suitable venting gap for the battery cell 20, the groove 41 can better protect the high-temperature medium ejected from the explosion-proof valve 21 and better protect the structure of the housing 10.

[0087] As shown in Figures 2 and 3, in some embodiments, the protective part 40 includes a main body 42, which protrudes from the cavity wall of the receiving cavity 30, and the surface of the main body 42 facing the explosion-proof valve 21 is recessed to form a groove 41. The main body 42 is constructed as a high-temperature resistant metal body. Furthermore, in some embodiments, the main body 42 is constructed as a high-temperature resistant ceramic body.

[0088] Specifically, the main body 42 protrudes from the inner surface of the cover and is located directly above the explosion-proof valve 21. The lower surface of the main body 42 is recessed to form a groove 41, which can be an arc-shaped groove. The main body 42 can be a high-temperature resistant metal body or a high-temperature resistant ceramic body.

[0089] When the main body 42 is set as a high-temperature resistant metal body, the main body 42 can be made of materials such as titanium, steel, and tungsten. In this case, the main body 42 can not only block the high-temperature medium, but also provide better protection due to its own high-temperature resistance.

[0090] When the main body 42 is set as a high-temperature resistant ceramic body, the main body 42 can be made of materials such as quartz, alumina, silicon dioxide, and ceramics. In this case, the main body 42 can not only block the high-temperature medium, but also play an insulating role, which can better protect the overall structure of the battery device 100.

[0091] Through the above structure, the main body 42 can better block the high-temperature medium, thereby protecting the enclosure 10 and effectively protecting the structure of the enclosure 10.

[0092] In some embodiments, the protective part 40 further includes a high-temperature resistant coating 43, which is applied to the inner surface of the groove 41.

[0093] Specifically, a high-temperature resistant coating 43 is applied to the inner surface of the groove 41, that is, the high-temperature resistant coating 43 is applied to the lower surface of the main body 42 facing the explosion-proof valve 21.

[0094] By applying a high-temperature resistant coating 43, the protection against high-temperature media can be further improved. Furthermore, the high-temperature resistant coating 43 makes the surface of the main body 42 smoother, reducing the probability of high-temperature media remaining in the groove 41 and better protecting the structure of the housing 10.

[0095] In some embodiments, the high-temperature resistant coating 43 comprises aluminum oxide. In some embodiments, the high-temperature resistant coating 43 comprises silicon dioxide.

[0096] Specifically, the high-temperature resistant coating 43 can be made of alumina or silicon dioxide, which not only improves the protection against high-temperature media, but also has good insulation properties.

[0097] In some embodiments, a plurality of battery cells 20 are included, and a group of battery cells 20 are arranged along the thickness direction c to form a battery cell group. Multiple groups of battery cells are arranged sequentially along the width direction a. Each battery cell 20 is provided with an explosion-proof valve 21. A plurality of protective parts 40 are included, and each protective part 40 extends along the thickness direction c, and each protective part 40 is correspondingly provided with each explosion-proof valve 21 of one of the battery cell groups.

[0098] Specifically, the receiving cavity 30 contains multiple battery cells 20, some of which are arranged along their thickness direction c to form battery cell groups, and multiple battery cell groups are arranged sequentially along their width direction a. That is, all battery cells 20 are arranged in an array within the receiving cavity 30. Each battery cell 20 has an explosion-proof valve 21 installed on its top cover.

[0099] Multiple protective sections 40 are provided, and all protective sections 40 are provided on the inner surface of the cover. Each protective section 40 extends along the thickness direction c of the battery cell 20 so that the length of each protective section 40 corresponds to the total length of each explosion-proof valve 21 in each group of battery cells.

[0100] Each protective part 40 is correspondingly provided to each explosion-proof valve 21 of one of the battery cell groups, that is, each protective part 40 is provided directly above the explosion-proof valve 21 of one of the battery cell groups.

[0101] With the above structure, the protective part 40 can simultaneously protect multiple explosion-proof valves 21, and better protect the overall structure of the battery device 100 without significantly affecting the overall energy density of the battery device 100.

[0102] Based on the same concept as the battery device 100 described above, this application also provides an electrical device including the battery device 100 as described above.

[0103] According to one or more embodiments, during use, multiple battery cells 20 are first arranged in an array within the receiving cavity 30, with the explosion-proof valve 21 facing the cover of the housing 10. A protective part 40 is provided on the inner surface of the cover, and the protective part 40 is located directly above the explosion-proof valve 21.

[0104] As the battery cell 20 is used repeatedly, when the temperature or pressure inside the battery cell 20 reaches a certain threshold, the explosion-proof valve 21 opens to release pressure. During the pressure release process, a high-temperature medium is ejected from the explosion-proof valve 21. At this time, the protective part 40 is located in the ejection path of the high-temperature medium, thereby blocking the high-temperature medium and reducing the probability of the high-temperature medium directly impacting the cover, thus protecting the cover.

[0105] At the same time, when the high-temperature medium comes into contact with the protective part 40, the high-temperature medium can disperse and flow along the shape of the groove 41, thereby reducing the probability of the high-temperature medium agglomerating and reducing the contact time between the high-temperature medium and the cover and other structures of the box 10, thereby reducing the damage of the high-temperature medium to the box 10.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery device, comprising: The box has a receiving cavity; and A battery cell is disposed within the receiving cavity, and an explosion-proof valve is provided on the battery cell. The cavity wall of the receiving cavity has a protective part, which corresponds to the explosion-proof valve and is configured to block the high-temperature medium ejected from the explosion-proof valve.

2. The battery device of claim 1, wherein, The surface of the protective part facing the explosion-proof valve is non-planar.

3. The battery device of claim 2, wherein, The protective part is recessed on the surface facing the explosion-proof valve in a direction away from the explosion-proof valve.

4. The battery device of claim 3, wherein, The protective part protrudes from the cavity wall of the receiving cavity, and the surface of the protective part facing the explosion-proof valve is recessed to form a groove, the diameter of the groove gradually increasing from the bottom wall to the opening.

5. The battery device of claim 4, wherein, The groove is constructed as an arc-shaped groove with its opening facing the explosion-proof valve.

6. The battery device according to claim 4 or 5, wherein The projection of the explosion-proof valve toward the cavity wall where the protective part is located is located within the projection of the groove onto the cavity wall.

7. The battery device of claim 6, wherein, In the width direction of the battery cell, the width of the groove is L, the length of the explosion-proof valve is D, and the maximum ejection angle when the explosion-proof valve is fully open is Θ; in the height direction of the battery cell, the distance between the lowest point of the groove bottom wall and the explosion-proof valve is H; where L≥H·tanΘ+1 / 2D.

8. The battery device according to any one of claims 1 to 7, wherein The protective part includes a main body, which protrudes from the cavity wall of the receiving cavity, and the surface of the main body facing the explosion-proof valve is recessed to form a groove; The main body is constructed as a high-temperature resistant metal body.

9. The battery device according to any one of claims 1 to 8, wherein The protective part includes a main body, which protrudes from the cavity wall of the receiving cavity, and the surface of the main body facing the explosion-proof valve is recessed to form a groove; The main body is constructed as a high-temperature resistant ceramic body.

10. The battery device according to claim 8 or 9, wherein The protective part also includes a high-temperature resistant coating, which is applied to the inner surface of the groove.

11. The battery device of claim 10, wherein, The high-temperature resistant coating includes aluminum oxide.

12. The battery device according to claim 10 or 11, wherein The high-temperature resistant coating includes silicon dioxide.

13. The battery device of any one of claims 1-12, wherein, The battery cell includes multiple cells, and multiple battery cells are arranged along the thickness direction to form a battery cell group, and multiple battery cell groups are arranged sequentially along the width direction. Each of the battery cells is provided with an explosion-proof valve. The protective part includes multiple parts, each of which extends along the thickness direction, and each of the protective parts corresponds to each of the explosion-proof valves in one of the battery cell groups.

14. An electrical appliance comprising a battery device as described in any one of claims 1-13.

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