Battery device and electric device

Abstract

The application discloses a battery device and an electric device. The battery device comprises a box body, a battery monomer group, and a burst valve and a baffle. The box body comprises a first wall, and the first wall is provided with an exhaust hole. The battery monomer group is at least partially arranged in the box body. The burst valve is connected with the first wall, and is configured to close the exhaust hole and open in response to internal environment change of the box body. The baffle is connected with the first wall, and a part of the baffle is arranged in a spaced mode with the first wall and forms an exhaust gap. The burst valve comprises a sealing film, the sealing film is arranged on a side of the first wall facing the battery monomer group, the melting point of the sealing film is lower than a temperature threshold of the battery monomer group, and the melting point of the sealing film is higher than a normal working temperature of the battery monomer group. The sealing film can melt to expose the exhaust hole and realize high-temperature gas discharge when the temperature in the box body is abnormal. In addition, the sealing film can fail to expose the exhaust hole in response to pressure change in the box body, and realize gas discharge under an overpressure working condition.

Description

Technical Field

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

[0002] With the technological development and product iteration of new energy vehicles, the reliability of batteries, as one of the power sources, has received more attention.

[0003] Improving battery safety is one of the ongoing research directions in the battery field. Utility Model Content

[0004] This application provides a battery device and an electrical device that can be sealed under normal operating conditions and perform venting and pressure relief functions under abnormal operating conditions such as overheating or overpressure, thereby improving the safety of the battery device.

[0005] In a first aspect, this application provides a battery device, including a housing, a battery cell assembly, and an explosion-proof valve. The housing includes a first wall with an exhaust port. The battery cell assembly is at least partially disposed within the housing. The explosion-proof valve is connected to the first wall and configured to close the exhaust port and open in response to changes in the internal environment of the housing. The explosion-proof valve includes a sealing membrane disposed on the side of the first wall facing the battery cell assembly. The melting point of the sealing membrane is lower than the temperature threshold of the battery cell assembly and higher than the normal operating temperature of the battery cell assembly. The explosion-proof valve also includes a baffle connected to the first wall, at least a portion of which is spaced apart from the first wall to form an exhaust gap.

[0006] The battery device provided in this embodiment has a vent hole on the first wall of the housing. The vent hole allows the housing to communicate with the external environment to meet the pressure relief requirements of the housing under abnormal operating conditions. An explosion-proof valve in the form of a sealing membrane is installed at the vent hole, covering the vent hole to achieve sealing of the housing under normal operating conditions.

[0007] By limiting the melting point of the sealing membrane, it can molten into a fluid state when the internal temperature of the enclosure is abnormal, exposing the vent holes. High-temperature gases can then be released through these vent holes, mitigating the tendency of the battery device to continue developing towards thermal runaway. Furthermore, the structural strength of the sealing membrane is lower than that of the first wall, allowing it to fail in response to pressure changes within the enclosure, thus exposing the vent holes and enabling gas release under overpressure conditions. Additionally, the baffle partially blocking the vent holes creates a smaller venting gap. Under the same internal pressure, this smaller gap will be exposed earlier, thereby improving the sensitivity of the explosion-proof valve to overpressure conditions.

[0008] In some of these embodiments, the baffle is positioned on the side of the sealing film opposite to the battery cell assembly.

[0009] In the above embodiments, the baffle can protect a portion of the sealing film, thereby reducing the probability of the sealing film failing unexpectedly under external impact and improving the reliability of the explosion-proof valve.

[0010] In some embodiments, the explosion-proof valve further includes a first connection portion through which a baffle is movably connected to a first wall, the first connection portion being configured to fail when the pressure reaches a threshold, causing the baffle to move relative to the vent.

[0011] In the above embodiments, by setting a first connecting part, the baffle and the first wall are movably connected, thereby enabling the baffle to form different opening degrees to change the exposed area of ​​the exhaust port, and the explosion-proof valve correspondingly forms a multi-stage pressure relief mode.

[0012] In some of these embodiments, the structural strength of the first connection is less than that of the baffle.

[0013] In the above embodiments, by limiting the relative structural strength between the first connecting part and the baffle, the first connecting part moves earlier than the baffle under overpressure conditions, and the baffle is opened through the movable connection.

[0014] In some of these embodiments, the structural strength of the first connection portion is less than the structural strength of the first wall.

[0015] In the above embodiments, the relative structural strength between the first connecting part and the first wall ensures that under overpressure conditions, the gas preferentially destroys the baffle corresponding to the first connecting part, thereby reducing the probability of damage to the first wall and the housing.

[0016] In some embodiments, the dimension of the first connecting portion in its own thickness direction is smaller than the dimension of the baffle in its own thickness direction.

[0017] In the above embodiments, by limiting the relative thickness relationship between the first connecting part and the baffle, the effect of the first connecting part failing earlier than the baffle under the same impact is achieved.

[0018] In some embodiments, the dimension of the first connecting portion in its own thickness direction is smaller than the dimension of the first wall in its own thickness direction.

[0019] In the above embodiments, by limiting the relative thickness relationship between the first connecting part and the first wall, the probability of damage to the first wall and the housing under the same impact is reduced.

[0020] In some of these embodiments, the material strength of the first connection is less than that of the baffle.

[0021] In the above embodiments, by restricting the materials used for the first connecting part and the baffle, the first connecting part can be activated earlier than the baffle, thereby creating an open state for the explosion-proof valve.

[0022] In some of these embodiments, the material strength of the first connection is less than that of the first wall.

[0023] In the above embodiments, by restricting the materials used for the first connecting part and the first wall, the first wall and the housing have better impact resistance, and the first connecting part can act earlier under the same impact to open the explosion-proof valve.

[0024] In some of these embodiments, the first connecting portion has at least one hole.

[0025] In the above embodiments, by opening a hole in the first connecting part to weaken the structural strength of the first connecting part, the first connecting part can open the explosion-proof valve earlier than the baffle under pressure impact.

[0026] In some embodiments, the explosion-proof valve further includes a second connecting portion, and the baffle is connected to the first wall through the first connecting portion and the second connecting portion, wherein the connection strength of the second connecting portion is less than the connection strength of the first connecting portion.

[0027] In the above embodiments, by separately providing a first connecting part and a second connecting part and defining the relative relationship of the connection strength between the two, the baffle can form at least three opening modes, thereby realizing at least three pressure relief modes of the explosion-proof valve.

[0028] In some embodiments, the baffle includes a proximal end and a distal end that are movably connected, the proximal end being connected to a first wall via a first connection, and the distal end moving relative to the proximal end when the second connection fails to expose a portion of the exhaust port.

[0029] In the above embodiments, by dividing the baffle into a near end and a far end, the baffle can achieve at least three opening modes by switching the action state of the near end and the far end in response to the internal pressure of the box.

[0030] In some of these embodiments, the edges of the exhaust gap are formed with obtuse angles.

[0031] In the above embodiments, the obtuse angle structure can reduce the probability of stress concentration at the first wall corresponding to the exhaust gap, thereby suppressing the tendency of the first wall to break under gas impact.

[0032] In some of these embodiments, the edges of the exhaust gap include an arcuate structure.

[0033] In the above embodiments, the structure of the first wall used to form the exhaust gap is set as a smooth segment corresponding to the arc structure, thereby forming a more uniform stress distribution and reducing the probability of the first wall being damaged under gas impact.

[0034] Secondly, this application provides an electrical device configured to receive electrical energy provided by a battery device according to any embodiment of the first aspect. Attached Figure Description

[0035] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery cell pack according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an explosion-proof valve according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an explosion-proof valve according to another embodiment of this application; Figure 6 for Figure 5 The diagram shows another perspective of the explosion-proof valve. Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the explosion-proof valve along AA; Figure 8 for Figure 5 The diagram shows one of the open states of the explosion-proof valve. Figure 9 This is a schematic diagram of the structure of an explosion-proof valve according to another embodiment of this application.

[0037] The accompanying drawings are not necessarily drawn to scale.

[0038] The specific marking information in the attached diagram is as follows: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Top cover; 20. Battery cell assembly; 21. Battery cell; 30. Housing; 31. First wall; 311. Exhaust vent; 312. Exhaust gap; 41. Sealing membrane; 42. Baffle; 421. Proximal end; 422. Distal end; 423. Weak part; 43. First connecting part; 431. First groove; 44. Second connecting part. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0045] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0048] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0049] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0050] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0051] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0052] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0053] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0054] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0055] During installation, power batteries are typically housed in enclosures to support and protect individual battery cells. These cells generate heat and gas during cycling. In particular, when a battery cell releases gas due to internal short circuits, overcharging, or external overheating, the internal pressure of the enclosure can rise rapidly in a short period. If this pressure is not released promptly, it can cause an internal fire, and in severe cases, even an explosion, threatening the lives of passengers.

[0056] To address this, relevant technologies incorporate a pressure relief mechanism in the battery casing. This mechanism uses springs and other components for switching control to release pressure. However, under long-term alternating loads, the switching control components are prone to stress relaxation and failure, resulting in the pressure relief mechanism failing to open properly and failing to seal. This not only weakens the battery's sealing performance but also makes it prone to thermal runaway under abnormal operating conditions, preventing the proper release of heat.

[0057] To address the aforementioned issues, this application provides a battery device and an electrical device. The battery device includes a housing, a battery cell assembly, and an explosion-proof valve. The housing has an exhaust port, and the explosion-proof valve includes a sealing membrane for sealing the exhaust port. The sealing membrane can melt in response to temperature changes inside the housing, or it can burst in response to pressure changes inside the housing. This allows the explosion-proof valve to open in response to overheating or overpressure conditions of the battery device, releasing hot gas and reducing the probability of the battery device developing into a thermal runaway state, thereby improving the reliability of the battery device.

[0058] It should be noted that the electrical devices provided in this application are not limited to vehicles equipped with batteries. They can also include mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0059] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0060] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0061] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery housing 30 and one or more battery cell packs 20. In some embodiments, the battery housing 30 may include a top cover 10 and a housing 30, with the top cover 10 and the housing 30 covering each other, and the top cover 10 and the housing 30 together defining a receiving cavity for accommodating the battery cell packs 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and the housing 30 together define the receiving cavity; the top cover 10 and the housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing 30 formed by the top cover 10 and the housing 30 may be of various shapes, such as a cylinder, a cuboid, etc.

[0063] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell group 20 according to some embodiments of this application. The battery cell group 20 is used to provide voltage and capacity. The battery cell group 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection through a busbar. The battery cell group 20 includes multiple battery cells 21, which can be connected in series, parallel, or mixed connection. Mixed connection means that multiple battery cells 21 are connected in both series and parallel connections. Multiple battery cells 21 can be directly connected in series, parallel, or mixed connection together, and then the whole formed by multiple battery cells 21 is housed in a housing 30; of course, the battery device 100 may also be in the form of multiple battery cells 21 first connected in series, parallel, or mixed connection to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed connection to form a whole and housed in a housing 30. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing the electrical connection between multiple battery cells 21.

[0064] Each battery cell 21 can be a secondary battery cell 21 or a primary battery cell 21; it can also be a lithium-sulfur battery cell 21, a sodium-ion battery cell 21, or a magnesium-ion battery cell 21, but is not limited to these. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes.

[0065] Please see Figures 4 to 9The first aspect of this application provides a battery device 100, which includes a housing 30, a battery cell group 20, and an explosion-proof valve. The battery cell group 20 is at least partially disposed inside the housing 30. The explosion-proof valve is configured to close the vent 311 and open in response to changes in the internal environment of the housing 30. The housing 30 has a vent 311, and the explosion-proof valve includes a sealing membrane 41 for sealing the vent 311.

[0066] Optionally, the shape of the exhaust port 311 can be set as a circular port, a rectangular port, an oblong port or other irregularly shaped port. The shape and position of the exhaust port 311 can be adjusted according to the actual exhaust speed requirements and the structural strength requirements of the housing 30.

[0067] The enclosure 30 includes a first wall 31, an exhaust port 311 is formed in the first wall 31, and a sealing membrane 41 is connected to the first wall 31 to seal the exhaust port 311. When the internal air pressure of the enclosure 30 is too high, the gas expands and pushes part of the sealing membrane 41 out of the exhaust port 311, causing deformation. When the sealing membrane 41 is deformed for a long time or when the internal air pressure of the enclosure 30 suddenly exceeds a threshold, the sealing membrane 41 will fail and expose the exhaust port 311, thereby allowing the interior of the enclosure 30 to communicate with the external environment to release gas.

[0068] Optionally, the first wall 31 is the top wall of the housing 30. It is understood that the gas released from the battery device 100 is generally high-temperature gas. High-temperature gas is less dense than air and therefore tends to rise. Placing the exhaust port 311 at the top of the housing 30 helps to accelerate the escape of the high-temperature gas.

[0069] Optionally, the first wall 31 is the side wall of the housing 30. For example, the battery device 100 is used as a power source for the vehicle 1000. The housing 30 of the battery device 100 cooperates with the chassis of the vehicle 1000 to form a space for accommodating the battery cell pack 20. At this time, the area above the battery cell pack 20 is the passenger compartment of the vehicle 1000, which makes it difficult to form an effective exhaust channel. The exhaust port 311 is opened on the side wall of the housing 30 to facilitate the formation of an exhaust channel and maintain the smoothness of the exhaust channel.

[0070] Optionally, the first wall 31 is the bottom wall of the housing 30, or, depending on the actual installation environment of the battery device 100, the first wall 31 may be other walls of the housing 30.

[0071] Specifically, under overpressure conditions of the housing 30, the failure modes of the sealing membrane 41 include at least one of the following: the sealing membrane 41 bursts or the sealing membrane 41 falls off.

[0072] Optionally, the sealing film 41 is disposed on the side of the first wall 31 facing the battery cell assembly 20, and the sealing film 41 is affixed to the first wall 31.

[0073] Optionally, the sealing membrane 41 is disposed on at least one side of the first wall 31 along its own thickness direction, and the sealing membrane 41 is fixed relative to the first wall 31 by bolts or other connecting members.

[0074] The sealing film 41 has a melting point lower than the temperature threshold of the battery cell pack 20. When the internal temperature of the housing 30 exceeds the temperature threshold of the battery cell pack 20, the sealing film 41 will melt and form a fluid state. Subsequently, the vent 311 will be exposed to allow the interior of the housing 30 to communicate with the external environment and achieve directional release of high-temperature gas, thereby suppressing the trend of the internal temperature of the housing 30 continuing to rise and reducing the probability of thermal runaway of the battery device 100.

[0075] Understandably, the melting point of the sealing film 41 is higher than the normal operating temperature of the battery cell pack 20, so that the sealing film 41 can be relatively fixed with the first wall 31 and the exhaust hole 311 can be sealed under normal operating conditions of the battery device 100, thus meeting the sealing requirements of the housing 30.

[0076] Optionally, the difference between the melting point of the sealing film 41 and the temperature threshold of the battery cell pack 20 is less than a first preset value. That is, the melting point of the sealing film 41 is closer to the temperature threshold of the battery cell pack 20. The temperature at which the sealing film 41 undergoes a phase change is closer to the safe operating temperature of the battery device 100, and the explosion-proof valve is more sensitive to changes in the temperature conditions of the battery device 100, reducing the probability of the sealing film 41 opening under normal operating conditions of the battery device 100.

[0077] According to the battery device 100 provided in the embodiments of this application, an exhaust port 311 is opened in the first wall 31 of the housing 30, and an explosion-proof valve in the form of a sealing membrane 41 is provided at the exhaust port 311. The sealing membrane 41 covers the exhaust port 311 to achieve the sealing of the housing 30 under normal working conditions. When the internal pressure of the housing 30 changes drastically, since the structural strength of the sealing membrane 41 is lower than that of the first wall 31, the exhaust port 311 can be used to connect the housing 30 with the external environment to meet the pressure relief requirements of the housing 30 under abnormal working conditions.

[0078] Furthermore, by limiting the melting point of the sealing membrane 41, it can form a molten fluid state when the internal temperature of the housing 30 is abnormal, thereby exposing the vent 311. This allows for the directional release of high-temperature gas from inside the housing 30 through the vent 311, mitigating the tendency of the battery device 100 to continue developing towards thermal runaway. It is understood that the melting point is an inherent physical property of the sealing membrane 41, and it does not change with the usage time of the battery device 100. Therefore, the explosion-proof valve in the form of the sealing membrane 41 has high reliability and will not fail to release pressure after reaching the opening conditions.

[0079] According to some embodiments of the first aspect of this application, please refer to Figure 5The explosion-proof valve also includes a baffle 42, which is connected to the first wall 31. The baffle 42 is disposed on the side of the sealing membrane 41 away from the battery cell group 20. At least a portion of the baffle 42 is spaced apart from the first wall 31 to form an exhaust gap 312.

[0080] Optionally, the baffle 42 is fixedly connected to the first wall 31.

[0081] Alternatively, the baffle 42 and the first wall 31 are an integral structure.

[0082] Alternatively, the baffle 42 is fixedly connected to the first wall 31 by welding or bolting.

[0083] Optionally, the structural strength of the baffle 42 is less than that of the first wall 31, and the baffle 42 is weaker than the first wall 31. When the air pressure inside the box 30 reaches the threshold, the sealing membrane 41 pushes outward and compresses the baffle 42 and the first wall 31. The baffle 42 can deform or fail before the first wall 31, causing the sealing membrane 41 to fail, thereby exposing the exhaust port 311 to achieve directional gas release.

[0084] Optionally, the area of ​​the baffle 42 is smaller than the area of ​​the exhaust hole 311, so that the baffle 42 can directly form an exhaust gap 312 with the exhaust hole 311 after installation.

[0085] Optionally, along the thickness direction of the first wall 31, the baffle 42 and the exhaust hole 311 partially overlap, so that an exhaust gap 312 can be formed between the baffle 42 and the first wall 31, so as to avoid the baffle 42 completely blocking the exhaust hole 311 and affecting the opening of the explosion-proof valve.

[0086] Therefore, the baffle 42 can protect a portion of the sealing membrane 41, reducing the probability of the sealing membrane 41 failing unexpectedly under external impact and improving the reliability of the explosion-proof valve. Furthermore, the baffle 42's partial obstruction of the vent hole 311 creates a smaller vent gap 312. Under the same internal pressure, the smaller vent gap 312 will be exposed earlier, thereby improving the explosion-proof valve's sensitivity to overpressure relief.

[0087] According to some embodiments of the first aspect of this application, please refer to Figure 5 and Figure 6 The explosion-proof valve also includes a first connection part 43, through which a baffle 42 is movably connected to a first wall 31. The first connection part 43 is configured to fail when the pressure reaches a threshold, so that the baffle 42 moves relative to the vent 311.

[0088] Specifically, the baffle 42 being movably connected to the first wall 31 via the first connecting part 43 means that the baffle 42 is connected to the first wall 31 via at least the first connecting part 43, and the first connecting part 43 has at least two states. When the state of the first connecting part 43 is switched, the baffle 42 moves relative to the first wall 31 to realize the transformation of the exhaust gap 312 into the exhaust port 311, thereby accelerating the gas release of the battery device 100.

[0089] The movement of the baffle 42 relative to the exhaust port 311 means that the spatial position of at least one of the baffle 42 and the exhaust port 311 changes, so as to change the blocking effect of the baffle 42 on the exhaust port 311 and realize the change of the opening state of the explosion-proof valve.

[0090] Specifically, please refer to Figure 8 When the first connecting part 43 fails, the baffle 42 rotates or swings; and / or, when the first connecting part 43 fails, the baffle 42 moves in a plane parallel to the first wall 31.

[0091] Optionally, the first connection part 43 is a heat-fused part, and the melting point of the first connection part 43 is lower than the temperature threshold of the battery cell pack 20. When the battery device 100 is in an overheated condition, after the sealing film 41 melts and fails, the high-temperature gas flows through the first connection part 43. The first connection part 43 melts in response to the temperature change, and the baffle 42 is disconnected from the first wall 31 accordingly. The exhaust channel at the explosion-proof valve is expanded from the exhaust gap 312 to the exhaust hole 311, which accelerates the release of high-temperature gas inside the box 30.

[0092] Alternatively, the melting point of the first connecting portion 43 is higher than the melting point of the sealing film 41.

[0093] Therefore, by setting the first connecting part 43 to make the baffle 42 and the first wall 31 movably connected, the baffle 42 can form different opening degrees to change the exposure area of ​​the exhaust port 311, and the explosion-proof valve correspondingly forms a multi-stage pressure relief mode.

[0094] According to some embodiments of the first aspect of this application, the structural strength of the first connecting portion 43 is less than the structural strength of the baffle 42.

[0095] Optionally, the area of ​​the first connecting part 43 in the cross-section perpendicular to the thickness direction of the first wall 31 is smaller than the area of ​​the baffle 42 in the cross-section perpendicular to the thickness direction of the first wall 31. When the gas inside the housing 30 directly or indirectly impacts the explosion-proof valve, since the first connecting part 43 has a smaller force-bearing area than the baffle 42, the first connecting part 43 fails before the baffle 42, causing the connection between the baffle 42 and the first wall 31 to break, thereby realizing the transformation of the exhaust gap 312 into the exhaust port 311, accelerating the release of high-temperature gas inside the housing 30.

[0096] Optionally, the connection strength between the first connecting part 43 and the first wall 31 is less than the connection strength between the first connecting part 43 and the baffle 42. When the explosion-proof valve is impacted by the high-temperature gas inside the housing 30, the connection between the first wall 31 and the first connecting part 43 fails first. Therefore, the first connecting part 43 and the baffle 42 are disconnected from the first wall 31 as a whole, and move relative to the first wall 31 under the gas impact to realize the transformation of the exhaust gap 312 into the exhaust port 311.

[0097] Optionally, the first connecting portion 43 is provided with a stress concentration area. Under the same gas impact, the stress concentration area can preferentially deform or rupture, thereby causing the first connecting portion 43 to fail before the baffle 42, and breaking the connection between the baffle 42 and the first wall 31 to further open the explosion-proof valve. Exemplarily, the stress concentration area includes structures that can form high stress, such as acute-angled structures, scored structures, or cracked structures.

[0098] Therefore, by limiting the relative structural strength between the first connecting part 43 and the baffle 42, the first connecting part 43 can act earlier than the baffle 42 under overpressure conditions, and the baffle 42 can be opened through the movable connection.

[0099] According to some embodiments of the first aspect of this application, the structural strength of the first connecting portion 43 is less than the structural strength of the first wall 31.

[0100] Optionally, the area of ​​the first connecting part 43 in the cross section perpendicular to the thickness direction of the first wall 31 is smaller than the area of ​​the first wall 31, so that the first connecting part 43 has a smaller stress area under the same gas impact. The first connecting part 43 breaks or ruptures before the first wall 31 to open the explosion-proof valve, thereby reducing the probability of damage to the first wall 31 and the housing 30.

[0101] Optionally, the first wall 31 is provided with a reinforced region. Exemplarily, the reinforced region includes structures that can reduce the impact on the first wall 31, such as a locally thickened structure, a rib structure, a stiffener structure, or a stress-dispersing structure.

[0102] Optionally, the structural strength of the baffle 42 is less than that of the first wall 31, so that the baffle 42 can fail before the first wall 31.

[0103] Therefore, through the relative structural strength between the first connecting part 43 and the first wall 31, under overpressure conditions, the gas preferentially damages the baffle 42 corresponding to the first connecting part 43, thereby reducing the probability of damage to the first wall 31 and the housing 30. On the one hand, the housing 30 can also be reused through maintenance operations such as replacing the explosion-proof valve, reducing losses; on the other hand, by reducing damage to the housing 30, the probability of the housing 30 further compressing the battery cell pack 20 is reduced.

[0104] According to some embodiments of the first aspect of this application, please refer to Figure 7 The dimension of the first connecting part 43 in its own thickness direction is smaller than the dimension of the baffle 42 in its own thickness direction.

[0105] Optionally, the entire first connecting part 43 is smaller in the thickness direction than the baffle 42.

[0106] Optionally, the dimension of a portion of the first connecting part 43 in its own thickness direction is smaller than the dimension of the baffle 42 in its own thickness direction.

[0107] Optionally, the first connecting part 43 includes a first groove 431. By opening the first groove 431, at least part of the thickness of the first connecting part 43 is reduced, so that the first connecting part 43 fails before the baffle 42 and the first wall 31 under the same gas impact, thereby realizing the opening of the explosion-proof valve.

[0108] For example, please refer to Figure 8 The first connecting part 43 deforms, and the baffle 42 rotates around the first connecting part 43, so that the effective exhaust area is greater than the exhaust gap 312 and smaller than the exhaust hole 311.

[0109] Further optionally, the first groove 431 is formed on the side of the first connecting portion 43 facing the battery cell pack 20, and / or the first groove 431 is formed on the side of the first connecting portion 43 away from the battery cell pack 20.

[0110] Alternatively, the width of the first groove 431 may remain unchanged or increase along the direction from the bottom of the groove to the opening of the groove.

[0111] Alternatively, the first groove 431 may include two groove walls that approach each other and eventually intersect, so that the bottom of the first groove 431 forms an acute angle structure. Under the same gas impact, the first groove 431 can fail earlier, thereby improving the response sensitivity of the explosion-proof valve to overpressure conditions.

[0112] Therefore, by limiting the relative thickness relationship between the first connecting part 43 and the baffle 42, the effect of the first connecting part 43 failing earlier than the baffle 42 under the same impact can be achieved.

[0113] According to some embodiments of the first aspect of this application, the dimension of the first connecting portion 43 in its own thickness direction is smaller than the dimension of the first wall 31 in its own thickness direction.

[0114] Optionally, the entire first connecting portion 43 is smaller in the thickness direction than the first wall 31 in the thickness direction.

[0115] Optionally, the dimension of a portion of the first connecting part 43 in its own thickness direction is smaller than the dimension of the first wall 31 in its own thickness direction.

[0116] Optionally, the thickness of the region of the first wall 31 near the vent 311 is greater than or equal to the thickness of the region of the first wall 31 away from the vent 311. It is understood that the region of the first wall 31 near the vent 311 bears greater stress when gas is vented directionally within the housing 30. Differentiating the thickness of different regions of the first wall 31 helps to reduce the probability of deformation and damage to the first wall 31 and the housing 30.

[0117] Optionally, the dimension of the baffle 42 in its own thickness direction is smaller than the dimension of the first wall 31 in its own thickness direction.

[0118] Therefore, by limiting the relative thickness relationship between the first connecting part 43 and the first wall 31, the probability of damage to the first wall 31 and the housing 30 under the same impact is reduced.

[0119] According to some embodiments of the first aspect of this application, the material strength of the first connecting portion 43 is less than the material strength of the baffle 42.

[0120] Optionally, both the first connecting part 43 and the baffle 42 are rigid components.

[0121] Alternatively, the first connecting part 43 and the baffle 42 may be made of different materials.

[0122] Alternatively, the first connecting portion 43 and the baffle 42 may be made of the same material, but their manufacturing processes may differ to allow them to form different states. For example, the first connecting portion 43 may be in an annealed or normalized state, and the baffle 42 may be in a quenched and tempered state.

[0123] Optionally, the first connecting part 43 is an elastic or plastic member, and the baffle 42 is a rigid member. For example, the first connecting part 43 includes rubber. When the gas inside the housing 30 directly or indirectly impacts the baffle 42, the first connecting part 43, which includes rubber material, can undergo elastic deformation, reducing the constraint exerted by the first connecting part 43 on the baffle 42 to accelerate the bursting of the sealing membrane 41 or to not restrict the range of motion of the baffle 42, thus accelerating the opening of the explosion-proof valve.

[0124] Therefore, by restricting the materials used for the first connecting part 43 and the baffle 42, the first connecting part 43 can be activated earlier than the baffle 42, thereby creating an open state for the explosion-proof valve.

[0125] According to some embodiments of the first aspect of this application, the material strength of the first connecting portion 43 is less than the material strength of the first wall 31.

[0126] Optionally, both the first connecting part 43 and the first wall 31 are rigid components.

[0127] Alternatively, the first connecting part 43 and the first wall 31 may be made of different materials.

[0128] Alternatively, the first connecting part 43 and the first wall 31 are made of the same material, and the manufacturing processes of the first connecting part 43 and the first wall 31 are different so that the first connecting part 43 and the first wall 31 form different states.

[0129] Optionally, the first connecting part 43 is an elastic or plastic member, and the first wall 31 is a rigid member.

[0130] Optionally, the material strength of the baffle 42 is less than that of the first wall 31.

[0131] Therefore, by limiting the materials used for the first connecting part 43 and the first wall 31, the first wall 31 and the housing 30 have better impact resistance, and the first connecting part 43 can act earlier under the same impact to open the explosion-proof valve.

[0132] According to some embodiments of the first aspect of this application, the first connecting portion 43 has at least one hole.

[0133] Optionally, the axial direction of the hole is parallel to the thickness direction of the first connecting part 43, or the axial direction of the hole is angled at an acute angle to the thickness direction of the first connecting part 43.

[0134] Optionally, the first connecting portion 43 has at least one blind hole.

[0135] Optionally, the first connecting portion 43 has at least one through hole extending through its own thickness direction.

[0136] It should be noted that the shape of the hole in the first connecting portion 43 is not specifically limited here. The hole can be a circular hole, a rectangular hole, a polygonal hole, or an irregularly shaped hole. For example, the hole can be formed along the length direction of the first connecting portion 43, and / or the edge of the hole can include both straight lines and arcs.

[0137] Optionally, the first connecting part 43 has multiple holes.

[0138] Alternatively, multiple holes may have the same diameter, or at least two holes may have different diameters.

[0139] Alternatively, along the arrangement path of the multiple holes, the hole diameter is greater than or equal to the distance between two adjacent holes, so as to further reduce the connection strength of the first connection part 43 and enable the explosion-proof valve to open more quickly under the same pressure conditions.

[0140] Alternatively, along the arrangement path of the multiple holes, the hole diameter is smaller than the spacing between two adjacent holes, so as to neutralize the weakening effect of the holes on the strength of the first connection part 43 and reduce the probability of the explosion-proof valve being opened accidentally due to premature failure of the first connection part 43.

[0141] Optionally, the area of ​​the hole accounts for more than 50% of the total area of ​​the first connection part 43, so as to further weaken the strength of the first connection part 43, so that the first connection part 43 can fail earlier under the same pressure impact, thereby improving the response sensitivity of the explosion-proof valve to the overpressure condition of the battery device 100.

[0142] Therefore, by opening a hole in the first connecting part 43 to weaken the structural strength of the first connecting part 43, the first connecting part 43 can be activated earlier than the baffle 42 under pressure impact to open the explosion-proof valve.

[0143] According to some embodiments of the first aspect of this application, please refer to Figure 9 The explosion-proof valve also includes a second connecting part 44. The baffle 42 is connected to the first wall 31 through the first connecting part 43 and the second connecting part 44. The connection strength of the second connecting part 44 is less than the connection strength of the first connecting part 43.

[0144] Optionally, the second connecting part 44 is disposed opposite to the first connecting part 43 on both sides of the baffle 42.

[0145] Optionally, the first connection part 43 is provided such that when the second connection part 44 fails, under gas impact, the baffle 42 can rotate around the first connection part 43 to partially open the explosion-proof valve, so that the opening state of the explosion-proof valve when the second connection part 44 fails is different from the opening state when the second connection part 44 is normal or the first connection part 43 also fails.

[0146] Optionally, the second connecting part 44 has the same connection form as the first connecting part 43.

[0147] Optionally, the second connecting part 44 and the first connecting part 43 are connected in a different manner.

[0148] Optionally, the structural strength of the second connecting part 44 is less than the structural strength of the first connecting part 43.

[0149] Optionally, both the first connecting part 43 and the second connecting part 44 are rigid components, and the material strength of the second connecting part 44 is less than that of the first connecting part 43.

[0150] Optionally, the second connecting portion 44 has a smaller dimension in its own thickness direction than the first connecting portion 43 has in its own thickness direction.

[0151] Therefore, by separately providing the first connecting part 43 and the second connecting part 44 and defining the relative relationship of their connection strength, the failure condition of the second connecting part 44 is different from that of the first connecting part 43. Under the same gas impact, the second connecting part 44 fails before the first connecting part 43, allowing the explosion-proof valve to form at least three states, including the baffle 42 being connected to the first wall 31 through the first connecting part 43 and the second connecting part 44, the baffle 42 being connected to the first wall 31 through the first connecting part 43, and the baffle 42 being disconnected from the first wall 31, thereby corresponding to at least three pressure relief modes of the battery device 100. Furthermore, under normal operating conditions, there are at least two connection points between the baffle 42 and the first wall 31, namely the first connecting part 43 and the second connecting part 44, which helps to improve the stability of the explosion-proof valve under normal operating conditions of the battery device 100.

[0152] According to some embodiments of the first aspect of this application, the baffle 42 includes a proximal end 421 and a distal end 422 that are movably connected. The proximal end 421 is connected to the first wall 31 via a first connecting portion 43. When the second connecting portion 44 fails, the distal end 422 moves relative to the proximal end 421 to expose a portion of the exhaust port 311.

[0153] Optionally, at least part of the exhaust gap 312 is formed between the distal end 422 and the first wall 31. As the gas is released from the exhaust gap 312, it impacts the distal end 422 to accelerate the failure of the second connection 44.

[0154] Optionally, the baffle 42 further includes a weak portion 423 disposed between the proximal end 421 and the distal end 422. When the second connecting portion 44 fails, the distal end 422 rotates about the weak portion 423 to achieve movement of the distal end 422 relative to the proximal end 421, and / or the weak portion 423 breaks at least partially to separate the distal end 422 from at least part of the proximal end 421 to form a partial opening of the exhaust port 311.

[0155] Alternatively, the dimension of the weak portion 423 in its own thickness direction is smaller than the smaller of the dimensions of the proximal end 421 and the distal end 422 in their respective thickness directions, so as to achieve the effect that the distal end 422 of the baffle 42 rotates around the weak portion 423 or the weak portion 423 at least partially breaks under the gas impact.

[0156] Alternatively, the weak portion 423 may be perforated or slotted so that the strength of the weak portion 423 is less than that of the weaker end 421 and the distal end 422.

[0157] Optionally, the size of the distal end 422 of the baffle 42 is smaller than the size of the proximal end 421, so as to avoid the proximal end 421 failing to open as expected due to the excessive pressure relief section after the distal end 422 opens.

[0158] Therefore, by dividing the baffle 42 into a proximal end 421 and a distal end 422, the baffle 42 can achieve at least three opening modes by switching the action state of the proximal end 421 and the distal end 422 in response to the internal pressure of the housing 30.

[0159] According to some embodiments of the first aspect of this application, the edge of the exhaust gap 312 is formed with an obtuse angle structure.

[0160] It is understandable that the obtuse angle structure formed by the edge of the exhaust gap 312 means that the boundary line of the closed figure enclosed by the exhaust gap 312 includes at least one obtuse angle.

[0161] Optionally, the end of the baffle 42 facing the exhaust gap 312 includes at least one obtuse angle.

[0162] Optionally, the end of the first wall 31 facing the exhaust gap 312 includes at least one obtuse angle.

[0163] Optionally, the baffle 42 is clamped at an obtuse angle to the first connecting part 43, and / or the baffle 42 is clamped at an obtuse angle to the second connecting part 44.

[0164] Therefore, setting an obtuse angle structure can disperse the stress at the solid structure corresponding to the exhaust gap 312, reduce the probability of stress concentration, and thus suppress the probability of the first wall 31 or baffle 42 being directly damaged under gas impact, resulting in non-directional pressure relief at other locations except for the explosion-proof valve.

[0165] According to some embodiments of the first aspect of this application, the edge of the exhaust gap 312 includes an arcuate structure.

[0166] It is understandable that the arc structure formed by the edge of the exhaust gap 312 means that the boundary line of the closed figure enclosed by the exhaust gap 312 includes at least one arc.

[0167] Optionally, the end of the baffle 42 facing the exhaust gap 312 includes at least one arc.

[0168] Optionally, the end of the first wall 31 facing the exhaust gap 312 includes at least one arc.

[0169] Therefore, the structure of the first wall 31 used to form the exhaust gap 312 is set as a smooth section corresponding to the arc structure, or the structure of the baffle 42 used to form the exhaust gap 312 is set as a smooth section corresponding to the fox spirit structure, thereby making a more uniform stress distribution around the exhaust gap 312 and reducing the probability of the first wall 31 or the baffle 42 being unexpectedly damaged under gas impact.

[0170] Secondly, this application provides an electrical device configured to receive electrical energy provided by the battery device 100 of any embodiment of the first aspect.

[0171] It is understood that, since the battery device 100 provided in any of the aforementioned first aspects is adopted, the power-consuming device provided in this application embodiment has all the beneficial effects of the battery device 100 in any of the aforementioned embodiments. For details, please refer to the foregoing description of the beneficial effects of the battery device 100. This application embodiment will not repeat the description.

[0172] For ease of understanding, the following is combined with Figures 5 to 8 A specific embodiment of this application will be described.

[0173] The battery device includes a housing, a group of individual battery cells, and an explosion-proof valve. The housing includes a first wall 31 with an exhaust port 311. The explosion-proof valve includes a sealing membrane 41, a baffle 42, and a first connecting part 43. The sealing membrane 41 covers the exhaust port 311 to seal the housing. The baffle 42 is connected to the first wall 31 via the first connecting part 43, and an exhaust gap 312 is formed between the baffle 42 and the first wall 31. When the battery device is under overheating conditions, the sealing membrane 41 can melt to expose the exhaust gap 312, allowing the gas inside the housing to be released to the external environment through the exhaust gap 312.

[0174] Furthermore, the first connecting part 43 has a first groove 431 on the side away from the sealing film 41 and the battery cell assembly. When the baffle 42 is subjected to gas impact, the relatively weak first connecting part 43 deforms and the baffle 42 can rotate around the first connecting part 43 to further expand the exhaust cross section.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The housing includes a first wall, which has an exhaust vent. The battery cell pack is at least partially disposed within the housing; An explosion-proof valve, connected to the first wall, is configured to close the vent and open in response to changes in the internal environment of the enclosure; A baffle is connected to the first wall, and a portion of the baffle is spaced apart from the first wall to form an exhaust gap; The explosion-proof valve includes a sealing membrane disposed on the side of the first wall facing the battery cell assembly. The melting point of the sealing membrane is lower than the temperature threshold of the battery cell assembly and higher than the normal operating temperature of the battery cell assembly.

2. The battery device according to claim 1, characterized in that, The baffle is located on the side of the sealing film opposite to the battery cell assembly.

3. The battery device according to claim 2, characterized in that, The explosion-proof valve further includes a first connecting portion, through which the baffle is movably connected to the first wall, and the first connecting portion is configured to fail when the pressure reaches a threshold, so that the baffle moves relative to the vent.

4. The battery device according to claim 3, characterized in that, The structural strength of the first connecting part is less than the structural strength of the baffle, and / or the structural strength of the first connecting part is less than the structural strength of the first wall.

5. The battery device according to claim 3 or 4, characterized in that, The dimension of the first connecting part in its own thickness direction is smaller than the dimension of the baffle in its own thickness direction, and / or the dimension of the first connecting part in its own thickness direction is smaller than the dimension of the first wall in its own thickness direction.

6. The battery device according to claim 3, characterized in that, The material strength of the first connecting part is less than the material strength of the baffle, and / or the material strength of the first connecting part is less than the material strength of the first wall.

7. The battery device according to claim 3, characterized in that, The first connecting part has at least one hole.

8. The battery device according to claim 3, characterized in that, The explosion-proof valve further includes a second connecting part, and the baffle is connected to the first wall through the first connecting part and the second connecting part, wherein the connection strength of the second connecting part is less than the connection strength of the first connecting part.

9. The battery device according to claim 8, characterized in that, The baffle includes a proximal end and a distal end that are movably connected. The proximal end is connected to the first wall via the first connecting portion. When the second connecting portion fails, the distal end moves relative to the proximal end to expose a portion of the exhaust port.

10. The battery device according to claim 2, characterized in that, The edge of the exhaust gap forms an obtuse angle structure, and / or the edge of the exhaust gap includes an arcuate structure.

11. An electrical appliance, characterized in that, The electrical device is configured to receive electrical energy provided by the battery device according to any one of claims 1 to 10.

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