Battery device and electric appliance

Abstract

This invention discloses a battery device and an electrical appliance. The battery device includes a housing, an electrode assembly, and a top cover assembly. The housing has a mounting cavity and a mounting port communicating with the mounting cavity, and the mounting cavity contains electrolyte. The electrode assembly is disposed within the mounting cavity. The top cover assembly includes a top cover and an explosion-proof valve. The top cover closes to the mounting port and has a vent communicating with the mounting cavity. The explosion-proof valve is sealed to the vent, and at least the portion of the top cover with the vent protrudes outward. The technical solution of this invention can reduce the possibility of electrolyte accumulation around the explosion-proof valve, causing contamination and corrosion, thus improving the service life of the explosion-proof valve. Simultaneously, it can also improve the space utilization of the mounting cavity by the electrode assembly, thereby increasing the energy density of the battery device.

Description

Technical Field

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

[0002] When electrolyte overflows or sprays from the battery device in the related technology, it tends to accumulate around the explosion-proof valve, which in turn makes the explosion-proof valve susceptible to contamination and corrosion. Summary of the Invention

[0003] The main objective of this application is to provide a battery device that reduces the possibility of electrolyte buildup around the explosion-proof valve, causing contamination and corrosion, and improves the service life of the explosion-proof valve.

[0004] To achieve the above objectives, the battery device proposed in this application includes:

[0005] The housing has a mounting cavity and a mounting port communicating with the mounting cavity, and the mounting cavity contains electrolyte;

[0006] Electrode assembly, the electrode assembly being disposed within the mounting cavity; and

[0007] The top cover assembly includes a top cover and an explosion-proof valve. The top cover closes to the mounting opening and has an exhaust port communicating with the mounting cavity. The explosion-proof valve is sealed to the exhaust port.

[0008] The portion of the top cover with at least one vent hole protrudes outwards.

[0009] The battery device of this application has an outwardly convex structure in the part of the top cover with at least an exhaust hole. This allows the electrolyte to flow back quickly along the inner side of the top cover away from the explosion-proof valve under the action of gravity when it overflows or sprays around the explosion-proof valve. This reduces the possibility of electrolyte accumulating around the explosion-proof valve and causing contamination and corrosion, thereby improving the service life of the explosion-proof valve.

[0010] Optionally, the top cover includes:

[0011] The middle section is convex and has an exhaust vent; and

[0012] The top cover assembly also includes two edge sections, which are respectively connected to opposite sides of the middle section. Each edge section has a pole located on one of the edge sections.

[0013] This allows for a reduction in electrolyte buildup around the explosion-proof valve, while also bringing the edge portion and electrode assembly closer together, facilitating electrical connection between the electrode post located on the edge portion and the electrode assembly. Simultaneously, it also makes it easier to control the outward protrusion of the top cover, preventing excessively large protrusions from interfering with the installation of subsequent electrical devices.

[0014] Optionally, the intermediate portion includes:

[0015] The mounting section is flat and has a mounting opening facing one side in the first direction. The mounting sections intersect in the first direction and are equipped with vent holes.

[0016] Two transition sections, each connecting to the mounting section and an edge section respectively.

[0017] This allows for uniform stress distribution throughout the installation section and provides a more suitable load-bearing capacity for the explosion-proof valve, thereby improving the overall strength of the top cover assembly; it also simplifies the structural design of the intermediate section.

[0018] Optionally, the transition section is flat, and the arrangement direction of the two edges is defined as the second direction. The transition section intersects the first direction and the second direction.

[0019] Alternatively, the transition section can be designed as an arc-shaped plate.

[0020] Therefore, designing the transition section as a flat plate with an inclined profile allows for better electrolyte drainage throughout the inner area, enhancing the reduction of electrolyte buildup around the explosion-proof valve. It also simplifies the top cover's structural design. Furthermore, designing the transition section as an arc shape further increases the remaining space for the electrode assembly, improving the utilization rate of the mounting cavity and thus increasing the battery's energy density. Alternatively, it enhances electrolyte drainage, further reducing the likelihood of electrolyte buildup around the explosion-proof valve.

[0021] Optionally, when the transition segment is plate-shaped and intersects the first and second directions, the angle formed by the transition segment and the second direction is defined as α, satisfying the relationship: 0.1°≤α≤45°;

[0022] And / or, define the extension length of the transition segment in the second direction as d1, satisfying the relationship: 1 mm ≤ d1 ≤ 100 mm.

[0023] This makes it easier to control the height of the protrusion of the installation section, so as to reduce the impact of the protruding structure of the top cover on the electrical connection of the subsequent pole and other objects.

[0024] Optionally, the arrangement direction of the two edge portions is defined as the second direction, the dimension of the mounting section in the second direction is d2, and the distance between the opposite sides of the vent hole wall in the second direction is d3, satisfying the relationship: 0.65≤d3 / d2≤0.95.

[0025] This allows the transition section to be connected to one end of the installation section and the vent hole to be relatively close, making it easier for the transition section to more effectively guide the electrolyte that is sprayed or overflowed onto the area around the explosion-proof valve, thereby reducing the possibility of electrolyte accumulating around the explosion-proof valve.

[0026] Optionally, the transition section is provided with an injection hole, which is connected to the mounting cavity;

[0027] The inner surface of the transition section is provided with a guide plate, and the guide plate and the transition section are configured to form a guide channel;

[0028] One end of the flow channel is connected to the injection hole, and the other end is connected to the mounting cavity, and the flow direction of at least part of the flow channel is set at an angle to the flow direction of the injection hole.

[0029] Therefore, by guiding and buffering the injected electrolyte through the flow channel, the possibility of excessive impact of the electrolyte on the electrode assembly located in the mounting cavity can be reduced, thereby reducing the possibility of the electrode assembly being damaged by impact during electrolyte injection due to the outward protrusion of the top cover.

[0030] Optionally, the injection hole is located at one end of the transition section near the installation section, and the flow guide channel extends from the end connected to the injection hole in a direction away from the installation section.

[0031] This allows the flow channel to have a certain extension length, thereby improving the guiding and buffering effect on the electrolyte; at the same time, it provides a structural foundation to facilitate the setting of the flow guide plate used to enclose the flow channel with a relatively high height, thereby increasing the residual space of the electrode assembly; moreover, it allows the flow guide plate and the explosion-proof valve on the installation section to be staggered, thereby reducing the obstruction caused by the flow guide plate when the explosion-proof valve is venting and depressurizing.

[0032] Optionally, compared to the end of the transition section connected to the mounting section and the end connected to the edge, the end of the guide channel connected to the mounting cavity is positioned closer to the end of the transition section connected to the mounting section.

[0033] This allows the guide plate used to enclose the flow channel to have a relatively high height, thereby increasing the residual space for the electrode assembly.

[0034] Optionally, the installation port is defined to face one side of the first direction, the arrangement direction of the two edges is defined as the second direction, the liquid flow direction of the injection hole is parallel to the first direction, the guide channel is arranged to extend linearly, and the liquid flow direction of the guide channel intersects the first direction and the second direction.

[0035] And / or, the cross-sectional area of ​​the flow channel and the cross-sectional area of ​​the injection hole are set to be equal.

[0036] This allows the extension directions of the injection hole and the flow channel to be more regular, making them easier to process and shape. Setting the cross-sectional area of ​​the flow channel and the cross-sectional area of ​​the injection hole to be equal can improve the stability of the electrolyte flow and further reduce the possibility of excessive impact on the electrode assembly located in the mounting cavity.

[0037] Optionally, a liquid storage tank is provided at the edge, and the liquid storage tank is located on the side of the pole facing the explosion-proof valve.

[0038] Therefore, the electrolyte that overflows to the outside of the top cover can be recovered and contained through the storage tank, reducing the possibility of electrolyte flowing to the electrode and improving the protection effect on the electrode.

[0039] Optionally, the mounting opening is defined to face one side of the first direction, the arrangement direction of the two edges is defined as the second direction, and the battery device also has a third direction intersecting the first and second directions;

[0040] The liquid storage tank extends along a third direction and passes through the edge on both sides of the third direction.

[0041] This design allows the electrolyte reservoir to span the entire width of the edge, enabling effective recovery and containment of the flowing electrolyte at various points along the width. Simultaneously, the recovered electrolyte can be discharged from the two openings in the width of the reservoir, reducing the possibility of the reservoir overflowing and flowing to the electrode due to the recovered electrolyte.

[0042] Optionally, the pole protrudes from the outer surface of the edge portion, and the distance between the outer surface of the middle portion and the outer surface of the edge portion at the maximum distance is smaller than the protrusion size of the pole protruding from the outer surface of the edge portion;

[0043] And / or, the top cover assembly also includes two protective sleeves, each sleeved over a pole post;

[0044] And / or, the inner surface of the edge is provided with a positioning rib, and the positioning rib and the edge are configured to form a positioning groove, and the end of the electrode assembly near the explosion-proof valve is adapted to be accommodated in the positioning groove;

[0045] And / or, the edge portion is provided in a flat plate shape, defining the side of the mounting opening facing the first direction, and the edge portions intersect in the first direction.

[0046] Therefore, setting the distance between the highest point of the middle section and the upper surface of the edge section to be less than the protrusion height of the electrode post relative to the upper surface of the edge section allows the upper end of the electrode post to be positioned higher than the highest point of the middle section, thus reducing the impact of the protruding structure of the top cover on the subsequent electrical connection of the electrode post and other objects. Covering the electrode post with a protective sleeve isolates the electrolyte from the electrode post, improving its protective effect. The positioning groove helps to position the electrode assembly within the mounting cavity, thereby improving the stability of the electrode assembly during installation. Setting the edge section as a flat plate makes its shape more regular, facilitating the installation of electrode posts and other structures, and improving manufacturing convenience.

[0047] Optionally, the top cover includes a stacked metal plate and an insulating plate, the insulating plate being located on the side of the metal plate facing the electrode assembly and having the same shape as the metal plate;

[0048] The vent is partially located on the metal plate, and the other part is located on the insulating plate.

[0049] Therefore, the top cover is designed as a double-layer structure including a stacked metal plate and an insulating plate. The metal plate can strengthen the top cover, while the insulating plate can provide insulation and isolation for the metal plate and electrode components.

[0050] This application also proposes an electrical device including the aforementioned battery device. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 structures shown in these drawings without creative effort.

[0052] Figure 1 This is an exploded structural diagram of an embodiment of the battery device of this application;

[0053] Figure 2 for Figure 1 Schematic diagram of the top cover assembly;

[0054] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0055] Figure 4 for Figure 2 A cross-sectional schematic diagram of the top cover assembly.

[0056] Explanation of icon numbers:

[0057] label name label name 100 Battery device 3115 transition section 10 case 3116 Injection port 11 Mounting cavity 3117 First son Kong 12 Installation port 3118 Second son Kong 20 Electrode assembly 3119 deflector 30 Top cover assembly 3200 diversion channel 31 Top cover 313 edge 31A metal plate 3131 Storage tank 31B Insulating board 3132 Positioning reinforcement 311 Middle section 3133 positioning groove 3111 Installation section 33 Explosion-proof valve 3112 Exhaust port 35 pole 3113 First section 37 protective cover 3114 Second section

[0058] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0060] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0061] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 according to the specific circumstances.

[0062] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0063] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Specifically, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0064] The production process of power batteries typically includes the following steps: First, electrode slurry preparation, which involves mixing electrode active materials, binders, solvents, etc., and thoroughly stirring and dispersing them to form a slurry; Second, coating, where the slurry prepared in the first step is uniformly coated onto the current collector to a specified thickness, and the solvent is dried; Third, electrode die-cutting, where the electrode sheets produced in the previous step are die-cut into specified sizes and shapes; Fourth, stacking or winding, where the positive and negative electrode sheets and separator are assembled together, and after adhesive bonding, an electrode core is formed; Fifth, battery assembly, where the electrode core produced in the previous step is installed into a pre-drilled casing, and top and side seals are completed (with a pre-reserved electrolyte injection port), forming an unfilled battery; Sixth, electrolyte injection, where a specified amount of electrolyte is injected into the battery device; Seventh, battery sealing, where the gas inside the battery device is extracted in a vacuum environment and sealed.

[0065] Therefore, the manufactured power battery needs to have excellent airtightness in its internal battery components. However, power batteries need to be charged during use. During charging, a chemical reaction occurs inside the battery, releasing gas and causing the internal pressure to rise, posing a safety hazard of explosion and fire. Therefore, related technologies employ a structure with an explosion-proof valve on the top cover of the battery component to release gas and pressure.

[0066] However, in actual use of battery devices, electrolyte overflow or spraying is inevitable. In such cases, due to the slow return rate of the electrolyte, it easily accumulates around the explosion-proof valve, making the valve susceptible to contamination and corrosion.

[0067] Therefore, based on the above considerations, in order to solve the problem in related technologies where electrolyte in battery devices easily accumulates around the explosion-proof valve during overflow or spraying, causing contamination and corrosion to the explosion-proof valve, this application proposes a novel battery device. This battery device innovatively designs the portion of the top cover where at least the vent hole of the explosion-proof valve is installed as an outward-protruding structure, so that the electrolyte can quickly flow back along the inward direction of the top cover away from the explosion-proof valve under the action of gravity, reducing the possibility of accumulation around the explosion-proof valve.

[0068] Additionally, it should be noted that battery devices mentioned in this art can be categorized into primary batteries and rechargeable batteries based on whether they are rechargeable. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. The battery device provided in this application refers to a rechargeable battery.

[0069] Furthermore, the battery device provided in this application can be a single physical module comprising one or more battery cells to provide a predetermined voltage and capacity; it can be a battery module or a battery pack. A battery cell is the basic unit in a battery device and can be used to manufacture battery modules or battery packs. A battery module is formed by connecting a certain number of battery cells in series and / or parallel and placing them in a frame to protect the battery cells from external impacts, heat, vibration, etc. A battery pack generally includes battery modules, a battery management system, and a housing to house the battery modules and the battery management system. The battery management system monitors and manages the charging and discharging process of the battery modules.

[0070] Furthermore, the battery device provided in this application can be applied to electrical devices to supply power to those devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0071] The structure of the battery device proposed in this application will be explained and illustrated below with examples:

[0072] Please refer to the reference. Figure 1 , Figure 2 as well as Figure 4 In one embodiment of this application, the battery device 100 proposed in this application includes a housing 10, an electrode assembly 20, and a top cover assembly 30. The housing 10 is provided with a mounting cavity 11 and a mounting port 12 communicating with the mounting cavity 11. An electrolyte is provided in the mounting cavity 11. The electrode assembly 20 is disposed in the mounting cavity 11. The top cover assembly 30 includes a top cover 31 and an explosion-proof valve 33. The top cover 31 covers the mounting port 12 and is provided with a vent 3112 communicating with the mounting cavity 11. The explosion-proof valve 33 is sealed to the vent 3112. The portion of the top cover 31 with at least the vent 3112 is convex.

[0073] The housing 10 can be used to form a mounting cavity 11 to accommodate the electrolyte and electrode assembly 20. A mounting port 12 communicating with the mounting cavity 11 can be located at one end of the housing 10. When the battery device 100 is in normal use and installation state, the mounting port 12 can face upwards. In this case, on a projection plane perpendicular to the vertical direction, the projection of the mounting port 12 can coincide with the projection of the mounting cavity 11, allowing the mounting port 12 to have a larger area, thus facilitating the installation of the electrode assembly 20 into the mounting cavity 11. This also simplifies the structure of the housing 10, thereby improving its manufacturing convenience. Furthermore, on a projection plane perpendicular to the vertical direction, the shape of the housing 10 can be square. It should be noted that "square" here includes squares and rectangles, and also includes cases where the corners are not chamfered or have been chamfered. Of course, in other embodiments, the shape of the housing 10 can also be circular or other shapes; this application does not limit the shape of the housing 10. In addition, to enhance the strength of the housing 10 and improve its protective effect on the electrode assembly 20, the housing 10 can be made of metal, such as aluminum or steel. Of course, in other embodiments, the housing 10 can also be made of plastic, and this application does not limit the material of the housing 10.

[0074] The electrode assembly 20 can be immersed in the electrolyte contained in the mounting cavity 11 to undergo an electrochemical reaction. The electrode assembly 20 may include a positive electrode, a negative electrode, and a separator located between them, and can be formed into a racetrack shape by winding or stacking to form a square shape. The portions of the positive and negative electrodes containing active material constitute the main body of the electrode assembly 20, while the portions of the positive and negative electrodes without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials can react with the electrolyte, and the tabs can be electrically connected to the terminals 35 disposed on the top cover 31 in the top cover assembly 30 described below to form a current loop. Furthermore, the number of electrode assemblies 20 in the mounting cavity 11 can be one, or two or more, stacked along the width direction of the housing 10.

[0075] The top cover assembly 30, via the top cover 31, can seal the mounting opening 12 to achieve sealed installation of the electrolyte and electrode assembly 20 located in the mounting cavity 11. The top cover 31 can be a double-layer structure including a metal plate 31A and an insulating plate 31B, as described below. Of course, in other embodiments, the top cover 31 can also be a single-layer structure including only the insulating plate 31B. The shape of the top cover 31 can be adapted to the shape of the mounting opening 12. Therefore, this application does not limit the structural shape type of the top cover 31. The explosion-proof valve 33 installed in the vent hole 3112 of the top cover 31 can release pressure when the pressure inside the battery device 100 is too high. Furthermore, at least the portion of the top cover 31 with the vent hole 3112 is convex outwards; that is, the top cover 31 can be partially convex outwards only in the portion with the vent hole 3112, for example, protruding upwards when the mounting opening 12 is facing upwards. Alternatively, the entire top cover 31 can be configured to convex outwards. At this time, the convex part of the top cover 31 can be arc-shaped, trapezoidal, hemispherical or frustum-shaped, etc. This application does not limit the structural form of the convex part.

[0076] The battery device 100 of this application features a convex structure on the top cover 31, where at least the portion with the vent 3112 is convex. This allows the electrolyte to flow back quickly along the inner side of the top cover 31 away from the explosion-proof valve 33 under gravity when it overflows or sprays around the valve. This reduces the possibility of electrolyte accumulation around the explosion-proof valve 33, which could cause contamination and corrosion, thus extending the service life of the valve. Simultaneously, this convex structure also increases the remaining space of the electrode assembly 20, improving the space utilization of the electrode assembly 20 within the mounting cavity 11 and thereby increasing the energy density of the battery device 100.

[0077] In one embodiment of this application, the top cover 31 includes a middle portion 311 and two edge portions 313. The middle portion 311 is convex and has an exhaust hole 3112. The two edge portions 313 are respectively connected to the opposite sides of the middle portion 311. The top cover assembly 30 also includes two pole posts 35, each pole post 35 being disposed on one edge portion 313.

[0078] The top cover 31 can be elongated, with two edge portions 313 at both ends, and a middle portion 311 disposed between the two edge portions 313. The two edge portions 313 provide mounting positions for the two pole posts 35, while the middle portion 311 provides a mounting position for the explosion-proof valve 33. The pole posts 35 can pass through the top cover 31 for electrical connection with the tabs in the electrode assembly 20 described above.

[0079] In this embodiment, the top cover 31 is configured to include a central portion 311 and two edge portions 313, with only the central portion 311 being a convex structure. This allows the electrolyte to flow back quickly away from the explosion-proof valve 33 by being guided through the inner side of the convex central portion 311, thus reducing electrolyte buildup around the explosion-proof valve 33. Simultaneously, the edge portions 313 and the electrode assembly 20 are positioned closer together, facilitating the electrical connection between the electrode post 35 on the edge portion 313 and the electrode assembly 20. Furthermore, it allows for easier control of the convex size of the top cover 31, preventing excessive convexity that could affect the installation of the subsequent electrical device 100. Moreover, the three-section structure formed by the central portion 311 and the two edge portions 313 simplifies the structure of the top cover 31, thereby improving its manufacturing convenience.

[0080] Please refer to the reference. Figure 2 and Figure 4 In one embodiment of this application, the middle portion 311 includes a mounting section 3111 and two transition sections 3115. The mounting section 3111 is flat and defines the mounting port 12 facing one side in the first direction. The mounting sections 3111 intersect in the first direction and are provided with vent holes 3112. Each transition section 3115 is connected to the mounting section 3111 and an edge portion 313 respectively.

[0081] The first direction can be the vertical direction as described above, or the height direction of the housing 10. The mounting section 3111 is flat, meaning that the upper and lower surfaces of the mounting section 3111 are planes. Furthermore, the mounting section 3111 intersects the first direction. That is, the mounting section 3111 can be perpendicular to the first direction, or nearly perpendicular, for example, forming a preset angle of 0.5° or 1°.

[0082] In this embodiment, the mounting section 3111 is designed as a flat plate, which allows for uniform stress distribution and provides a more suitable load-bearing capacity for the explosion-proof valve 33, thereby improving the overall strength of the top cover assembly 30. Simultaneously, the shape of the middle section 311 is made more regular, simplifying its structural design and improving the ease of manufacturing and installing the explosion-proof valve 33.

[0083] Please refer to the reference. Figure 2 and Figure 4 In one embodiment of this application, the transition segment 3115 is arranged in a flat plate shape, and the arrangement direction of the two edge portions 313 is defined as the second direction. The transition segment 3115 intersects the first direction and the second direction.

[0084] The second direction can be a horizontal direction, or the length direction of the shell 10. The transition section 3115 intersects the first and second directions, meaning that the transition section 3115 is inclined. At this time, the outward convex form of the middle part 311 is formed into a trapezoidal shape as described above.

[0085] In this embodiment, the transition section 3115 is also set as a flat plate and is inclined, so that while the middle part 311 forms an outward convex shape, it can play a better role in guiding the electrolyte at various points on the inner side, enhancing the effect of reducing electrolyte accumulation around the explosion-proof valve 33. At the same time, the transition section 3115 can also be adapted and connected with the flat mounting section 3111 and the edge part 313, making the shape of the top cover 31 more regular, simplifying the structural design of the top cover 31 and improving the convenience of manufacturing the top cover 31.

[0086] In one embodiment of this application, the transition section 3115 is arranged in an arc-shaped plate.

[0087] The transition section 3115 is in the shape of an arc plate, meaning that the upper and lower surfaces of the transition section 3115 are arc surfaces. The axes of the upper and lower surfaces of the transition section 3115 can be located below or above the transition section 3115.

[0088] In this embodiment, the transition section 3115 is set in an arc shape. When the axes of the upper and lower surfaces of the transition section 3115 are located below the transition section 3115, the residual space of the electrode assembly 20 can be further increased, thereby improving the utilization rate of the space of the mounting cavity 11 and increasing the energy density of the battery device 100. When the axes of the upper and lower surfaces of the transition section 3115 are located above the transition section 3115, the flow rate of the electrolyte inside the transition section 3115 can be accelerated, thereby improving the guiding effect on the electrolyte and enhancing the effect of reducing electrolyte accumulation around the explosion-proof valve 33.

[0089] Of course, it should be noted that in other embodiments, both the mounting plate and the transition section 3115 may be arranged in an arc-shaped plate form, so that the outward convex form of the middle portion 311 is formed in the arc shape described above. Even in some embodiments, the mounting section 3111 may be flat and intersect in the first direction, while the transition section 3115 may be flat and parallel to the vertical direction. In this case, a chamfer may be provided between the mounting section 3111 and the transition section 3115. This chamfer includes a rounded corner or a beveled corner.

[0090] Please refer to Figure 4In one embodiment of this application, when the transition segment 3115 is arranged in a flat plate shape and intersects with the first direction and the second direction, the included angle formed by the transition segment 3115 and the second direction is defined as α, satisfying the relationship: 0.1°≤α≤45°.

[0091] In this embodiment, the included angle α formed by the transition section 3115 and the second direction is set to 0.1° to 45°. This ensures that the tilt angle of the transition section 3115 is not too large, and consequently, that the protrusion height of the mounting section 3111 is not too high. This reduces the impact of the protruding structure of the top cover 31 on the electrical connection between the subsequent terminal post 35 and other objects. For example, these other objects can be busbars in the battery device 100 used for electrical connection of different battery cells. α can be 0.1°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, or 45°, or any value within the above range.

[0092] Please refer to Figure 4 In one embodiment of this application, the extension length of the transition segment 3115 in the second direction is defined as d1, satisfying the relationship: 1 mm ≤ d1 ≤ 100 mm.

[0093] The extension length of the transition section 3115 in the second direction, that is, the extension distance of the transition section 3115 from one end near the edge portion 313 to one end near the mounting section 3111.

[0094] In this embodiment, the extension length d1 of the transition section 3115 in the second direction is set to 1 mm to 100 mm. This also achieves the effect described above, ensuring that the height of the mounting section 3111 is not too high, thereby reducing the impact of the protruding structure of the top cover 31 on the electrical connection between the subsequent pole post 35 and other objects. The extension length d1 of the transition section 3115 in the second direction can be 1 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, or 100 mm, or any value within the above range.

[0095] Please refer to Figure 4 In one embodiment of this application, the transition section 3115 is provided with an injection hole 3116, which is connected to the mounting cavity 11; the inner surface of the transition section 3115 is provided with a guide plate 3119, and the guide plate 3119 and the transition section 3115 are configured to form a guide channel 3200; one end of the guide channel 3200 is connected to the injection hole 3116, and the other end is connected to the mounting cavity 11, and at least part of the liquid flow direction of the guide channel 3200 is set at an angle to the liquid flow direction of the injection hole 3116.

[0096] The injection hole 3116 is used to inject electrolyte into the mounting cavity 11. The injection hole 3116 can be circular to improve ease of manufacturing. Alternatively, it can be square or other shapes. The direction of electrolyte flow in the injection hole 3116 can be the direction of its centerline. This direction can be parallel to the first direction, or it can form a preset angle of 0.5° or 1° with the first direction. Furthermore, the injection hole 3116 can be located near one end of the mounting section 3111, as described below, or in the middle of the transition section 3115, or at other locations. The number of injection holes 3116 can be one, located in one of the two transition sections 3115. Alternatively, there can be two or more injection holes 3116. At this point, the two or more injection holes 3116 can be located on one of the two transition sections 3115, or they can be located on each of the two transition sections 3115. A guide plate 3119 can be disposed on the lower surface of the transition section 3115 and, together with the transition section 3115, form a guide channel 3200. The guide channel 3200 can be used to guide and buffer the liquid injected through the injection holes 3116. The guide channel 3200 can extend linearly, in which case the liquid flow direction of the guide channel 3200 can be considered the direction of the guide channel's centerline. Alternatively, the guide channel 3200 can extend along an arc, in which case the liquid flow direction of the guide channel 3200 can be the tangential direction of the guide channel 3200. Alternatively, the guide plate 3119 may include a baffle and a side plate, with the baffle and transition section 3115 spaced apart. The side plate is connected to the baffle and together with the baffle, forms a tank structure. The tank structure and transition section 3115 enclose a liquid passage with an open end only near the injection port and an open end away from the injection port. Of course, the guide plate 3119 may also consist only of a baffle. Therefore, this application does not limit the structural form of the guide plate 3119.

[0097] In this embodiment, the flow channel 3200 guides and buffers the injected electrolyte, which can reduce the possibility of excessive impact of the electrolyte on the electrode assembly 20 located in the mounting cavity 11, thereby reducing the possibility of the electrode assembly 20 being damaged by impact during liquid injection due to the outward protrusion of the top cover 31.

[0098] Please refer to Figure 4 In one embodiment of this application, the injection hole 3116 is located at one end of the transition section 3115 near the installation section 3111, and the flow channel 3200 extends from the end connected to the injection hole 3116 in a direction away from the installation section 3111.

[0099] In this embodiment, the injection hole 3116 is positioned close to the mounting section 3111, and the flow channel 3200 extends towards the side where the edge portion 313 is located. This allows the flow channel 3200 to have a certain extension length, thereby improving the guiding and buffering effect on the electrolyte. Furthermore, this provides a structural foundation to facilitate the setting of the guide plate 3119, which encloses the flow channel 3200, to have a relatively high height, thus increasing the remaining space of the electrode assembly 20. Moreover, the flow plate 3119 and the explosion-proof valve 33 on the mounting section 3111 can be staggered, thereby reducing the obstruction caused by the flow plate 3119 when the explosion-proof valve 33 is venting and depressurizing, and improving the smoothness of the explosion-proof valve 33's venting.

[0100] Please refer to Figure 4 In one embodiment of this application, the flow channel 3200 is located closer to the end of the transition section 3115 connected to the mounting section 3111 than the end of the transition section 3115 connected to the edge portion 313.

[0101] In this embodiment, the end of the flow channel 3200 away from the injection hole 3116 extends to the middle position without exceeding the transition section 3115. This allows the flow guide plate 3119 used to enclose the flow channel 3200 to have a relatively high height as described above, so as to increase the residual space of the electrode assembly 20.

[0102] Please refer to Figure 4 In one embodiment of this application, the liquid flow direction of the injection hole 3116 is parallel to the first direction, and the guide channel 3200 is arranged to extend linearly, with the liquid flow direction of the guide channel 3200 intersecting the first direction and the second direction.

[0103] In this embodiment, the liquid flow direction of the injection hole 3116 extends in the vertical direction, and the liquid flow direction of the guide channel 3200 extends obliquely downward. This makes the extension directions of both the injection hole 3116 and the guide channel 3200 relatively regular, which facilitates their processing and shaping.

[0104] Please refer to Figure 4 In one embodiment of this application, the cross-sectional area of ​​the flow channel 3200 and the cross-sectional area of ​​the injection hole 3116 are set to be equal.

[0105] In this embodiment, setting the cross-sectional area of ​​the flow channel 3200 and the cross-sectional area of ​​the injection hole 3116 to be equal can improve the stability of electrolyte flow and further reduce the possibility of excessive impact on the electrode assembly 20 located in the mounting cavity 11. Of course, in other embodiments, the cross-sectional area of ​​the flow channel 3200 may be larger than the cross-sectional area of ​​the injection hole 3116.

[0106] Please refer to the reference. Figure 2 and Figure 4 In one embodiment of this application, the edge portion 313 is provided with a liquid storage tank 3131, which is located on the side of the pole post 35 facing the explosion-proof valve 33.

[0107] The liquid storage tank 3131 is located on the side of the pole 35 facing the explosion-proof valve 33, that is, the liquid storage tank 3131 is located in the middle of the top cover 31 relative to the pole 35. The liquid storage tank 3131 can extend linearly as described below, or it can extend along an arc. The cross-section of the liquid storage tank 3131 can be arc-shaped or triangular, etc. Therefore, this application does not limit the structural shape of the liquid storage tank 3131.

[0108] In this embodiment, even if the electrolyte overflows to the outside of the top cover 31, it can be recovered and contained through the storage tank 3131, thereby reducing the possibility of the electrolyte flowing to the electrode post 35 and improving the protection effect on the electrode post 35.

[0109] Please refer to Figure 2 In one embodiment of this application, the battery device 100 further has a third direction intersecting the first and second directions; the liquid storage tank 3131 extends along the third direction and penetrates the edge portion 313 on opposite sides of the third direction.

[0110] The third direction can be another horizontal direction, or the width direction of the housing 10. The liquid storage tank 3131 extends through the edge 313 on both sides in the third direction, that is, the liquid storage tank 3131 is provided with openings at both ends in the third direction.

[0111] In this embodiment, the electrolyte storage tank 3131 extends along a third direction and penetrates the opposite sides of the edge portion 313 in the third direction, so that the electrolyte storage tank 3131 spans the entire width direction of the edge portion 313, thereby effectively recovering and containing the flowing electrolyte at various points in the width direction. Simultaneously, the recovered and contained electrolyte can be discharged from the two openings in the width direction of the electrolyte storage tank 3131, reducing the possibility of the electrolyte storage tank 3131 overflowing and flowing into the electrode post 35 due to the recovered and contained electrolyte. Therefore, through effective recovery and containment at various points and discharge in the width direction, the protection effect on the electrode post 35 can be further improved. Moreover, the shape of the electrolyte storage tank 3131 is relatively simple, which also facilitates its processing and molding.

[0112] Please refer to Figure 4In one embodiment of this application, the pole post 35 protrudes from the outer surface of the edge portion 313, and the distance between the outer surface of the middle portion 311 and the outer surface of the edge portion 313 at the maximum distance is smaller than the protrusion size of the pole post 35 protruding from the outer surface of the edge portion 313.

[0113] In this embodiment, the distance between the highest point of the middle portion 311 and the upper surface of the edge portion 313 is less than the protrusion height of the pole post 35 relative to the upper surface of the edge portion 313. This allows the upper end of the pole post 35 to be positioned higher than the highest point of the middle portion 311, thereby facilitating the reduction of the impact of the convex structure of the top cover 31 on the electrical connection between the pole post 35 and other objects, as described above.

[0114] Please refer to Figure 4 In one embodiment of this application, the arrangement direction of the two edge portions 313 is defined as the second direction, the dimension of the mounting section 3111 in the second direction is d2, and the distance between the opposite sides of the hole wall of the vent hole 3112 in the second direction is d3, satisfying the relationship: 0.65≤d3 / d2≤0.95.

[0115] In this embodiment, setting the ratio of d3 to d2 to 0.65 to 0.95 allows the transition section 3115 to be connected to one end of the mounting section 3111 and the vent 3112 in a relatively close manner. This facilitates the transition section 3115 in more effectively guiding the electrolyte sprayed or overflowing onto the area around the explosion-proof valve 33, thereby reducing the possibility of electrolyte accumulation around the explosion-proof valve 33. The ratio of d3 to d2 can be 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, or 0.95, or any value within the above range.

[0116] Please refer to the reference. Figure 2 and Figure 4 In one embodiment of this application, the top cover assembly 30 further includes two protective sleeves 37, each of which is fitted onto a pole post 35.

[0117] In this embodiment, a protective sleeve 37 is fitted onto the electrode post 35, so that even if electrolyte flows to the location of the electrode post 35, the electrolyte and the electrode post 35 can be isolated, thereby improving the protection effect of the electrode post 35. The protective sleeve 37 can be made of an insulating material, such as plastic, to simultaneously provide insulation and protection for the electrode post 35.

[0118] Please refer to the reference. Figure 2 and Figure 3In one embodiment of this application, a positioning rib 3119 is provided on the inner surface of the edge portion 313. The positioning rib 3119 and the edge portion 313 are configured to form a positioning groove 3133. The end of the electrode assembly 20 near the explosion-proof valve 33 is adapted to be placed in the positioning groove 3133.

[0119] Two positioning ribs 3119 can be provided, located at the two edges 313 respectively. At this time, the positioning ribs 3119 can form a C shape, and the opening of the C shape formed by the two positioning ribs 3119 can be arranged opposite to each other, thereby achieving the function of limiting the electrode assembly 20 in both the first direction and the third direction.

[0120] In this embodiment, the positioning groove 3133 is formed by the positioning rib 3119 and the edge portion 313, which can position the electrode assembly 20 located in the mounting cavity 11, thereby improving the stability of the electrode assembly 20 in the mounting cavity 11.

[0121] Please refer to Figure 4 In one embodiment of this application, the edge portion 313 is provided in a flat plate shape, and the edge portions 313 intersect in a first direction.

[0122] The edge portion 313 is flat, meaning that both the upper and lower surfaces of the edge portion 313 are planar. Furthermore, the edge portions 313 intersect in a first direction. That is, the edge portion 313 can be perpendicular to or nearly perpendicular to the first direction, for example, forming a preset angle of 0.5° or 1°.

[0123] In this embodiment, the edge portion 313 is set as a flat plate, which makes the shape of the edge portion 313 more regular, thereby facilitating the installation of structures such as the pole post 35 and improving the ease of manufacturing.

[0124] Please refer to Figure 4 In one embodiment of this application, the top cover 31 includes a metal plate 31A and an insulating plate 31B stacked together. The insulating plate 31B is located on the side of the metal plate 31A facing the electrode assembly 20 and has the same shape as the metal plate 31A. The metal plate 31A is provided with a first hole segment 3113, and the insulating plate 31B is provided with a second hole segment 3114. The second hole segment 3114 and the first hole segment 3113 are connected and configured to form an exhaust hole 3112.

[0125] Metal plate 31A and insulating plate 31B define the layer structure of the top cover 31 in the first direction. The top cover 31 described above, comprising a middle portion 311 and an edge portion 313, defines the region of the top cover 31 in the second direction. Therefore, both the middle portion 311 and the edge portion 313 of the top cover 31 include metal plate 31A and insulating plate 31B.

[0126] In this embodiment, the top cover 31 is configured as a double-layer structure comprising a metal plate 31A and an insulating plate 31B stacked together. The metal plate 31A strengthens the top cover 31, while the insulating plate 31B provides insulation between the metal plate 31A and the electrode assembly 20. The metal plate 31A and the insulating plate 31B can be bonded together to increase the connection and thus improve the connection strength. This eliminates the need for a connection structure on the metal plate 31A and the insulating plate 31B, simplifying the structure of the top cover 31. Furthermore, the vent 3112 is divided into a first segment 3113 and a second segment 3114, which are respectively disposed on the metal plate 31A and the insulating plate 31B. The guide plate 3119 described above can be disposed on the transition section 3115 of the insulating plate 31B, the positioning rib 3119 can be disposed on the edge portion 313 of the insulating plate 31B, and the liquid storage tank 3131 can be disposed on the edge portion 313 of the metal plate 31A. In addition, the injection hole 3116 described above can be divided into a first sub-hole 3117 and a second sub-hole 3118, which are respectively set on the transition section 3115 of the metal plate 31A and the insulating plate 31B, and the liquid passage can be connected to the second sub-hole 3118.

[0127] Please refer to the reference. Figures 1 to 4In one embodiment of this application, the battery device 100 includes a housing 10, an electrode assembly 20, and a top cover assembly 30. The housing 10 has a mounting cavity 11 and a mounting port 12 communicating with the mounting cavity 11, and the mounting cavity 11 contains electrolyte. The electrode assembly 20 is disposed in the mounting cavity 11. The top cover assembly 30 includes a top cover 31 and an explosion-proof valve 33. The top cover 31 covers the mounting port 12 and has a vent 3112 communicating with the mounting cavity 11. The explosion-proof valve 33 seals the vent 3112. The portion of the top cover 31 with at least the vent 3112 is convex. The top cover 31 includes a middle portion 311 and two edge portions 313. The middle portion 311 is convex and has a vent 3112. The two edge portions 313 are respectively connected to opposite sides of the middle portion 311. The top cover assembly 30 also includes two terminals 35, each terminal 35 being disposed on one edge portion 313. The intermediate section 311 includes a mounting section 3111 and two transition sections 3115. The mounting section 3111 is flat, with the mounting opening 12 facing one side in the first direction. The mounting sections 3111 intersect in the first direction and are provided with vent holes 3112. Each transition section 3115 is connected to the mounting section 3111 and an edge portion 313. The transition section 3115 is flat, with the arrangement direction of the two edge portions 313 defined as the second direction. The transition section 3115 intersects in the first and second directions. The included angle formed by the transition section 3115 and the second direction is defined as α, satisfying the relationship: 0.1°≤α≤45°. The extension length of the transition section 3115 in the second direction is defined as d1, satisfying the relationship: 1 mm≤d1≤100 mm. The transition section 3115 is provided with an injection hole 3116, which is connected to the mounting cavity 11. A guide plate 3119 is provided on the inner surface of the transition section 3115, and the guide plate 3119 and the transition section 3115 are configured to form a flow channel 3200. One end of the flow channel 3200 is connected to the injection hole 3116, and the other end is connected to the mounting cavity 11. At least a portion of the flow direction of the flow channel 3200 is angled to the flow direction of the injection hole 3116. The injection hole 3116 is located at the end of the transition section 3115 near the mounting section 3111, and the flow channel 3200 extends from the end connected to the injection hole 3116 in a direction away from the mounting section 3111. Compared to the transition section 3115, which connects to one end of the mounting section 3111 and the other end of the edge portion 313, the flow channel 3200, which connects to the mounting cavity 11, is positioned closer to the end of the transition section 3115 that connects to the mounting section 3111. The mounting port 12 is defined as facing one side in the first direction, the arrangement direction of the two edge portions 313 is defined as the second direction, the liquid flow direction of the injection hole 3116 is parallel to the first direction, the flow channel 3200 extends linearly, and the liquid flow direction of the flow channel 3200 intersects the first and second directions; the cross-sectional area of ​​the flow channel 3200 is equal to the cross-sectional area of ​​the injection hole 3116.The edge portion 313 is provided with a liquid storage tank 3131, which is located on the side of the pole 35 facing the explosion-proof valve 33. The mounting port 12 is defined as facing the side in the first direction, and the arrangement direction of the two edge portions 313 is the second direction. The battery device 100 also has a third direction intersecting the first and second directions. The liquid storage tank 3131 extends along the third direction and passes through the edge portion 313 on opposite sides in the third direction. The electrode post 35 protrudes from the outer surface of the edge portion 313. The distance between the outer surface of the middle portion 311 and the outer surface of the edge portion 313 at the maximum distance is smaller than the protrusion of the electrode post 35 from the outer surface of the edge portion 313. The dimension of the mounting section 3111 in the second direction is d2, and the distance between the two opposite sides of the hole wall of the exhaust hole 3112 in the second direction is d3, satisfying the relationship: 0.65≤d3 / d2≤0.95. The top cover assembly 30 also includes two protective sleeves 37, each protective sleeve 37 being fitted onto one electrode post 35. The inner surface of the edge portion 313 is provided with a positioning rib 3119, and the positioning rib 3119 and the edge portion 313 are configured to form a positioning groove 3133. The end of the electrode assembly 20 near the explosion-proof valve 33 is adapted to be accommodated in the positioning groove 3133. The edge portion 313 is flat and defines the mounting port 12 facing one side in the first direction. The edge portion 313 intersects in the first direction. The top cover 31 includes a metal plate 31A and an insulating plate 31B stacked together. The insulating plate 31B is located on the side of the metal plate 31A facing the electrode assembly 20 and has the same shape as the metal plate 31A. The metal plate 31A is provided with a first hole segment 3113, and the insulating plate 31B is provided with a second hole segment 3114. The second hole segment 3114 and the first hole segment 3113 are connected and configured to form an exhaust hole 3112.

[0128] The above are merely preferred embodiments of this application and do not limit the scope of the patent application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of this application.

Claims

1. A battery device, characterized in that, include: The housing has a mounting cavity and a mounting port communicating with the mounting cavity, and the mounting cavity contains an electrolyte. An electrode assembly disposed within the mounting cavity; as well as A top cover assembly, the top cover assembly including a top cover and an explosion-proof valve, the top cover covering the mounting port and having an exhaust port communicating with the mounting cavity, the explosion-proof valve being sealed to the exhaust port; The portion of the top cover with the exhaust hole is convex.

2. The battery device as claimed in claim 1, characterized in that, The top cover includes: The middle portion, which is convex outward and has the exhaust port; and The top cover assembly includes two edge portions, which are respectively connected to opposite sides of the middle portion. Each of the two edge portions is located on one of the edge portions.

3. The battery device as claimed in claim 2, characterized in that, The intermediate portion includes: The mounting section is flat and has a mounting opening facing one side in a first direction. The mounting section intersects in the first direction and includes the vent hole. Two transition sections, each of which is connected to the mounting section and the edge portion respectively.

4. The battery device as claimed in claim 3, characterized in that, The transition section is flat, and the arrangement direction of the two edges is defined as the second direction. The transition section intersects the first direction and the second direction. Alternatively, the transition section may be configured as an arc-shaped plate.

5. The battery device as claimed in claim 4, characterized in that, When the transition segment is plate-shaped and intersects the first direction and the second direction, the included angle formed by the transition segment and the second direction is defined as α, satisfying the relationship: 0.1°≤α≤45°; And / or, define the extension length of the transition segment in the second direction as d1, satisfying the relationship: 1 mm ≤ d1 ≤ 100 mm.

6. The battery device as claimed in claim 3, characterized in that, The arrangement direction of the two edge portions is defined as the second direction, the dimension of the mounting section in the second direction is d2, and the distance between the opposite sides of the vent hole wall in the second direction is d3, satisfying the relationship: 0.65≤d3 / d2≤0.

95.

7. The battery device as claimed in claim 3, characterized in that, The transition section is provided with an injection hole, which is connected to the mounting cavity; The inner surface of the transition section is provided with a guide plate, and the guide plate and the transition section are configured to form a guide channel; One end of the flow channel is connected to the injection hole, and the other end is connected to the mounting cavity, and the flow direction of at least a portion of the flow channel is set at an angle to the flow direction of the injection hole.

8. The battery device as claimed in claim 7, characterized in that, The injection hole is located at one end of the transition section near the installation section, and the flow guide channel extends from the end connected to the injection hole in a direction away from the installation section.

9. The battery device as claimed in claim 8, characterized in that, Compared to the end of the transition section connected to the mounting section and the end connected to the edge, the end of the flow channel connected to the mounting cavity is positioned closer to the end of the transition section connected to the mounting section.

10. The battery device as claimed in claim 7, characterized in that, The mounting port is defined as facing one side in the first direction, the arrangement direction of the two edges is defined as the second direction, the liquid flow direction of the injection hole is parallel to the first direction, the guide channel is arranged to extend linearly, and the liquid flow direction of the guide channel intersects the first direction and the second direction; And / or, the cross-sectional area of ​​the flow channel and the cross-sectional area of ​​the injection hole are set to be equal.

11. The battery device according to any one of claims 2 to 10, characterized in that, The edge portion is provided with a liquid storage tank, which is located on the side of the pole facing the explosion-proof valve.

12. The battery device as claimed in claim 11, characterized in that, The mounting port is defined as facing one side in the first direction, the arrangement direction of the two edges is defined as the second direction, and the battery device also has a third direction intersecting the first direction and the second direction; The liquid storage tank extends along the third direction and penetrates the edge portion on both sides of the third direction.

13. The battery device according to any one of claims 2 to 10, characterized in that, The pole protrudes from the outer surface of the edge portion, and the distance between the outer surface of the middle portion and the outer surface of the edge portion at the maximum distance is smaller than the protrusion size of the pole protruding from the outer surface of the edge portion; And / or, the top cover assembly further includes two protective sleeves, each of the protective sleeves being fitted onto one of the pole posts; And / or, the inner surface of the edge portion is provided with a positioning rib, the positioning rib and the edge portion are configured to form a positioning groove, and the end of the electrode assembly near the explosion-proof valve is adapted to be accommodated in the positioning groove; And / or, the edge portion is provided in a flat plate shape, defining one side of the mounting opening facing the first direction, and the edge portion intersects in the first direction.

14. The battery device according to any one of claims 1 to 13, characterized in that, The top cover includes a stacked metal plate and an insulating plate, the insulating plate being located on the side of the metal plate facing the electrode assembly and having the same shape as the metal plate; The exhaust port is partially located on the metal plate and partially located on the insulating plate.

15. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 14.

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