Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device.The battery device comprises a battery monomer and a box body, the box body is provided with a containing space, the battery monomer is arranged in the containing space, the box body is provided with an exhaust mechanism, the exhaust mechanism is used for communicating the containing space with the outside, and in the open state, the exhaust mechanism comprises a set of slits; the group of slits comprises at least one first slit, the maximum size A of each first slit along the width direction is greater than or equal to 0.03 mm and less than or equal to 0.8 mm, and / or the exhaust mechanism comprises a group of round holes, the group of round holes comprises at least one first round hole, the diameter R of each first round hole is greater than or equal to 0.03 mm and less than or equal to 0.8 mm. According to the structure, electrolyte steam generated by the battery monomers in a thermal runaway state can be discharged at a relatively high flow speed, the electrolyte steam is relatively high in diffusion speed, can be quickly evaporated and is not easy to condense to form smoke, and the use experience of the battery device is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery device and an electrical device. Background Art

[0002] Batteries have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation means, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, and electric tools, etc.

[0003] With the continuous development of battery technology, the application scope of batteries is getting wider and wider, and people's requirements for the usage experience of batteries are getting higher and higher. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device and an electrical device, and the battery device has a good usage experience.

[0005] In a first aspect, some embodiments of the present application provide a battery device, which includes a battery cell and a box body. The box body has a receiving space, and the battery cell is disposed in the receiving space; the box body is provided with an exhaust mechanism for communicating the receiving space with the outside. In an open state, the exhaust mechanism includes a group of slits, and the group of slits includes at least one first slit. The maximum dimension of each first slit in the width direction is A, and 0.03 mm ≤ A ≤ 0.8 mm, and / or, the exhaust mechanism includes a group of round holes, and the group of round holes includes at least one first round hole. The diameter of each first round hole is R, and 0.03 mm ≤ R ≤ 0.8 mm.

[0006] In the above structure, since the exhaust mechanism forms the first slit and / or the first round hole for discharging the gas in the receiving space to the outside atmosphere, and the dimension A of the first slit in the width direction ranges from 0.03 mm to 0.8 mm, and the diameter R of the first round hole ranges from 0.03 mm to 0.8 mm, the electrolyte vapor generated by the battery cell in a thermal runaway state can be discharged at a relatively fast flow rate, the electrolyte vapor diffuses relatively fast, can be quickly evaporated, and is not easily condensed to form smoke, which is beneficial to improving the usage experience of the battery device.

[0007] According to the battery device provided by some embodiments of the present application, when the exhaust mechanism includes a group of slits, the box body includes a first box wall, the exhaust mechanism includes a cover body and an exhaust hole provided on the first box wall. The cover body is connected to the first box wall and is spaced from the first box wall along the axial direction of the exhaust hole. A first slit is formed between the cover body and the first box wall, and the first slit communicates with the receiving space through the exhaust hole. A first slit communicating with the exhaust hole is formed between the cover body and the first box wall, so that the first slit communicates with the receiving space, and the electrolyte vapor in the receiving space can diffuse to the outside air through the exhaust hole and the first slit.

[0008] According to the battery device provided by some embodiments of the present application, the exhaust mechanism further includes a valve seat. The cover is connected to the first box wall through the valve seat, and the cover is located on the side of the first box wall away from the accommodation space. By arranging the cover on the side of the first box wall away from the accommodation space, the electrolyte vapor discharged from the accommodation space can smoothly diffuse into the external air through the exhaust hole and the first slit, which is beneficial to improving the diffusion effect of the electrolyte vapor in the external air.

[0009] According to the battery device provided by some embodiments of the present application, the valve seat includes a seat body and a support body. The seat body is connected to the side of the first box wall away from the accommodation space and forms a communication cavity around the outside of the exhaust hole. The support body is connected to the seat body and the cover. The cover is spaced from the seat body on the side away from the first box wall. A first slit is formed between the cover and the seat body, and the first slit is communicated with the exhaust hole through the communication cavity, so that the communication cavity can lead the electrolyte vapor in the accommodation space to the outside away from the accommodation space, which is beneficial to enabling the electrolyte vapor to better diffuse into the external air away from the outside of the accommodation space.

[0010] According to the battery device provided by some embodiments of the present application, at least part of the support body is located in the communication cavity. The support body is connected to the inner wall surface of the communication cavity and the wall surface of the cover facing the seat body, which is beneficial to improving the utilization rate of the space of the valve seat.

[0011] According to the battery device provided by some embodiments of the present application, the valve seat and the cover are of an integrally formed structure, so that the overall structure of the valve seat and the cover has good strength.

[0012] According to the battery device provided by some embodiments of the present application, in a state where the exhaust mechanism includes a set of slits, the exhaust mechanism includes a valve seat having a seat body, an elastic member, and a cover. The seat body is connected to the box body, and the seat body has a communication cavity communicated with the accommodation space. The elastic member is connected between the cover and the seat body and makes the cover abut against the seat body; the elastic member is configured to deform when the internal pressure in the accommodation space reaches a threshold value, so that the cover moves, and a first slit communicated with the communication cavity is formed between the cover and the seat body, so that when the internal pressure in the accommodation space reaches the threshold value, the electrolyte vapor in the accommodation space can be discharged to the external air through the exhaust hole, the communication cavity, and the first slit, realizing rapid diffusion in the external air.

[0013] According to the battery device provided by some embodiments of the present application, the valve seat further includes a support body. The support body and the elastic member are located in the communication cavity. The support body is connected to the inner wall surface of the communication cavity, and the elastic member is connected between the support body and the cover. By arranging the support body and the elastic member in the communication cavity, it is beneficial to improve the utilization rate of the space.

[0014] According to the battery device provided in some embodiments of the present application, when the internal pressure of the accommodating space exceeds the pressure of the external atmosphere by a pressure difference of C, the cover moves and a first slit is formed between the cover and the base, wherein 0.08kPa≤C≤40kPa. This not only enables the electrolyte vapor to be discharged from the first slit at a faster flow rate under the action of the pressure difference, but also makes it less likely for serious air holding to occur in the accommodating space, thereby reducing the possibility of swelling of the battery device.

[0015] According to the battery device provided in some embodiments of the present application, the exhaust mechanism also includes a limiting structure connected to the seat body, part of the limiting structure is located on the side of the cover body away from the seat body and is spaced apart from the cover body, and the limiting structure can block the cover body from being detached from the seat body to limit the distance that the cover body is detached from the seat body.

[0016] According to the battery device provided in some embodiments of the present application, the limiting structure includes a connecting portion, an extending portion and a blocking portion, the extending portion is connected between the blocking portion and the connecting portion, the connecting portion is connected to the base body, and the blocking portion is located on the side of the cover body away from the base body for blocking the cover body.

[0017] According to the battery device provided in some embodiments of the present application, when the cover body is against the base body, along the arrangement direction of the cover body and the base body, the distance between the blocking portion and the cover body is A, so that the distance that the blocking portion is separated from the base body can be limited to A, thereby allowing the cover body to be separated from the base body, and the size of the first slit formed between the base bodies in the width direction is A.

[0018] According to the battery device provided in some embodiments of the present application, when the exhaust mechanism includes a group of slits, 0.05mm≤A≤0.5mm; when the exhaust mechanism includes a group of circular holes, 0.05mm≤R≤0.5mm.

[0019] According to the battery device provided in some embodiments of the present application, a protruding structure is provided at the first slit, so that the airflow is more likely to form turbulence when flowing out from the first slit, which is beneficial to improving the diffusivity of the electrolyte vapor, so that the electrolyte vapor can evaporate more quickly and is less likely to form smoke when the electrolyte vapor is discharged from the first slit.

[0020] According to the battery device provided in some embodiments of the present application, the box body includes a first box wall and a second box wall, the second box wall encloses a storage space, the first box wall is connected to the second box wall and encloses an exhaust space with the second box wall; the battery device also includes a pressure relief mechanism, the pressure relief mechanism is arranged on the second box wall to connect the storage space with the exhaust space, and the exhaust mechanism is arranged on the first box wall. By arranging the exhaust mechanism on the first box wall located outside the second box wall, and the pressure relief mechanism is arranged on the second box wall, the exhaust mechanism arranged on the first box wall does not affect the sealing of the storage space enclosed by the second box wall.

[0021] According to the battery device provided by some embodiments of the present application, in a state where the exhaust mechanism includes a group of slits, the total cross-sectional area of the group of slits is B, 30 mm 2 ≤B≤100 mm 2 ; in a state where the exhaust mechanism includes a group of round holes, the total cross-sectional area of the group of round holes is B, 30 mm 2 ≤D≤100 mm 2 , which not only makes it difficult for the electrolyte vapor to accumulate in the accommodation space and can be discharged smoothly, but also makes it difficult for the exhaust mechanism to reduce the discharge speed of the electrolyte vapor due to too large a ventilation area, or for the electrolyte vapor in the accommodation space to not be discharged smoothly due to too small a ventilation area, resulting in too high a pressure in the accommodation space and causing safety problems.

[0022] According to the battery device provided by some embodiments of the present application, in a state where the exhaust mechanism includes a group of slits, there are a plurality of first slits, and the plurality of first slits are arranged at intervals; in a state where the exhaust mechanism includes a group of round holes, there are a plurality of first round holes, and the plurality of first round holes are arranged at intervals, which makes the distribution of the first slits or the first round holes relatively dispersed and is beneficial to improving the uniformity of exhaust.

[0023] In a second aspect, some embodiments of the present application provide an electrical device, which includes the battery device provided by any of the above technical solutions, and the battery device is used to provide electrical energy.

[0024] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0025] Some embodiments of the present application provide a battery device, which includes a battery cell and a box body. The box body has an accommodation space, the battery cell is arranged in the accommodation space, and the box body is provided with an exhaust mechanism for communicating the accommodation space with the outside. In an open state, the exhaust mechanism includes a group of slits, the group of slits includes at least one first slit, and the maximum dimension of each first slit in the width direction is A, 0.03 mm ≤ A ≤ 0.8 mm, and / or the exhaust mechanism includes a group of round holes, the group of round holes includes at least one first round hole, and the diameter of each first round hole is R, 0.03 mm ≤ R ≤ 0.8 mm. In the above structure, since the exhaust mechanism forms the first slit and / or the first round hole for discharging the gas in the accommodation space to the outside atmosphere, and the dimension A of the first slit in the width direction ranges from 0.03 mm to 0.8 mm, and the diameter R of the first round hole ranges from 0.03 mm to 0.8 mm, the electrolyte vapor generated by the battery cell in a thermal runaway state can be discharged at a relatively fast flow rate, the electrolyte vapor diffuses quickly, can evaporate quickly, and is not easy to condense into smoke, which is beneficial to improving the use experience of the battery device.

[0026] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. Brief Description of the Drawings

[0027] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0029] Figure 2 is an exploded view of a battery device provided by some embodiments of the present application;

[0030] Figure 3 is an exploded view of a partial structure of a battery device provided by some embodiments of the present application;

[0031] Figure 4 is an enlarged view of the exhaust port of a battery device provided by some embodiments of the present application;

[0032] Figure 5 is an enlarged view of the exhaust port of a battery device provided by some other embodiments of the present application;

[0033] Figure 6 is an enlarged view of the exhaust port of a battery device provided by some further embodiments of the present application;

[0034] Figure 7 is a schematic internal structure diagram of an exhaust mechanism in a battery device provided by some embodiments of the present application;

[0035] Figure 8 is a schematic structural diagram of a box body in a battery device provided by some embodiments of the present application;

[0036] Figure 9 is a schematic internal structure diagram of an exhaust mechanism in a battery device provided by some other embodiments of the present application;

[0037] Figure 10 is a schematic structural diagram of a cover body in a battery device provided by some embodiments of the present application;

[0038] Figure 11 is a schematic internal structure diagram of an exhaust mechanism in a battery device provided by some further embodiments of the present application;

[0039] Figure 12 Schematic structural diagram of the valve seat in the battery device provided by some embodiments of the present application;

[0040] Figure 13 Schematic internal structure diagram of the exhaust mechanism in the battery device provided by some other embodiments of the present application when no exhaust port is formed;

[0041] Figure 14 Schematic internal structure diagram of the exhaust mechanism in the battery device provided by some other embodiments of the present application when an exhaust port is formed;

[0042] Figure 15 Schematic structural diagram of the box body in the battery device provided by some other embodiments of the present application.

[0043] In the figure:

[0044] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Box body; 51. First box body; 52. Second box body; 53. Accommodating space; 54. First box wall; 542. Exhaust hole; 55. Second box wall; 6. Battery cell; 8. Exhaust mechanism; 81. First slit; 82. First round hole; 811. Protrusion structure; 83. Cover body; 84. Valve seat; 841. Seat body; 8411. Communication cavity; 842. Support body; 85. Elastic member; 86. Limiting structure; 861. Connection part; 862. Extended part; 863. Blocking part; 9. Pressure relief mechanism. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0047] References to "embodiments" in this application mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0050] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0051] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of roughly parallelism commonly recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of roughly perpendicularity commonly recognized in engineering. Exemplarily, if the included angle between two directions is 85° - 90°, the two directions can be considered perpendicular; if the included angle between two directions is 0° - 5°, the two directions can be considered parallel.

[0052] The term "a plurality of" appearing in this application refers to two or more (including two).

[0053] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace.

[0054] The battery device mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0055] The battery cell can be a secondary battery cell, which refers to a battery cell that can activate the active material through charging and continue to be used after discharging.

[0056] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0057] 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. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0058] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0059] In some embodiments, the battery device can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0060] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0061] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] During the use of the battery device, there is a risk of thermal runaway in the battery cells inside. When thermal runaway occurs in the battery cell, the electrolyte in the battery cell will evaporate, and a large amount of electrolyte vapor is mixed in the thermal runaway gas. The electrolyte vapor will condense to form smoke during the process of being discharged from the battery device, which not only reduces the surrounding visibility but also seriously affects the use experience of the battery device.

[0063] To improve the usage experience of a battery device, some embodiments of the present application provide a battery device, which includes battery cells and a box body. The box body has a receiving space, and the battery cells are arranged in the receiving space. The box body is provided with an exhaust mechanism for communicating the receiving space with the outside. In the open state, the exhaust mechanism includes a set of slits, and the set of slits includes at least one first slit. The maximum dimension of each first slit in the width direction is A, where 0.03 mm ≤ A ≤ 0.8 mm, and / or the exhaust mechanism includes a set of round holes, and the set of round holes includes at least one first round hole. The diameter of each first round hole is R, where 0.03 mm ≤ R ≤ 0.8 mm. In the above structure, since the exhaust mechanism forms the first slits and / or the first round holes for discharging the gas in the receiving space to the outside atmosphere, and the dimension A of the first slit in the width direction ranges from 0.03 mm to 0.8 mm, and the diameter R of the first round hole ranges from 0.03 mm to 0.8 mm. By providing the first slits and / or the first round holes in the exhaust mechanism and adjusting the dimensions of the first slits and / or the first round holes to a preset range, the electrolyte vapor generated by the battery cells in the thermal runaway state can be discharged at a relatively fast flow rate after being adjusted by the first slits and / or the first round holes, can evaporate quickly, and is not easily condensed to form smoke, which is beneficial to improving the usage experience of the battery device.

[0064] The battery device described in the embodiments of the present application is applicable to the electrical device using the battery device.

[0065] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical devices.

[0066] For the convenience of description in the following embodiments, a vehicle as an electrical device in an embodiment of the present application is taken as an example for description.

[0067] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0068] As Figure 1As shown, a battery device 2 is provided inside the vehicle 1, and the battery device 2 can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1. For example, the battery device 2 can be used as the operating power source of the vehicle 1.

[0069] The vehicle 1 may further include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1.

[0070] In some embodiments of the present application, the battery device 2 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 It is an exploded view of the battery device provided for some embodiments of the present application. As Figure 2 shown, the battery device 2 includes a box body 5 and battery cells 6, and the battery cells 6 are accommodated in the box body 5. Among them, the box body 5 is used to provide an accommodation space for the battery cells 6. There can be multiple battery cells 6 in the battery device 2, and the multiple battery cells 6 can be connected in series, in parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 6. The multiple battery cells 6 can be directly connected in series, in parallel or in a mixed connection together, and then the whole formed by the multiple battery cells 6 is accommodated in the box body 5; of course, the battery device 2 can also be that multiple battery cells 6 are first connected in series, in parallel or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole and are accommodated in the box body 5.

[0072] The box body 5 may include a first box body 51 and a second box body 52. The first box body 51 and the second box body 52 are covered with each other to define an accommodation space 53 for accommodating the battery cells 6. The first box body 51 and the second box body 52 can be of various shapes, such as a cuboid, a cylinder, etc. The first box body 51 can be a hollow structure with one side open, and the second box body 52 can also be a hollow structure with one side open. The open side of the second box body 52 is covered on the open side of the first box body 51, then the box body 5 with the accommodation space 53 is formed.

[0073] The battery device 2 may further include other structures. For example, the battery device 2 may further include a busbar component for realizing the electrical connection between the multiple battery cells 6.

[0074] As Figure 3As shown, some embodiments of the present application provide a battery device 2, which includes battery cells 6 and a box body 5. The box body 5 has a receiving space 53, and the battery cells 6 are arranged in the receiving space 53. The box body 5 is provided with an exhaust mechanism 8, and the exhaust mechanism 8 is used to communicate the receiving space 53 with the outside. In the open state, the exhaust mechanism 8 includes a set of slits, and the set of slits includes at least one first slit 81. The maximum dimension of each first slit 81 in the width direction is A, where 0.03 mm ≤ A ≤ 0.8 mm, and / or the exhaust mechanism 8 includes a set of round holes, and the set of round holes includes at least one first round hole 82. The diameter of each first round hole 82 is R, where 0.03 mm ≤ R ≤ 0.8 mm.

[0075] The battery cell 6 can be the smallest unit capable of outputting electric energy as an independent power source. The box body 5 can be a component for enclosing the receiving space 53, and the battery cell 6 is arranged in the receiving space 53 in the box body 5. The box body 5 can be the first box body 51 described in the foregoing technical solution, or can be the second box body 52 described in the foregoing technical solution. There can be multiple battery cells 6 in the battery device 2, and the multiple battery cells 6 can be connected in series, in parallel, or in a mixed connection to form an integral unit that is received in the receiving space 53 of the box body 5.

[0076] The exhaust mechanism 8 can be a mechanism for discharging the gas in the receiving space 53 to the outside air, and it is used to discharge the gas in the receiving space 53 to the outside air at a relatively fast flow rate for rapid diffusion. The exhaust mechanism 8 is arranged on the box body 5, and by forming a structure that can communicate the receiving space 53 with the outside air, the gas in the receiving space 53 can be discharged to the outside air.

[0077] A set of slits can include at least one first slit 81. The first slit 81 can refer to a slit with a long strip-shaped cross-sectional area. In some examples, a slit with a length-to-width ratio greater than or equal to 10 can be called a slit. The dimension of the first slit 81 in the width direction can refer to the dimension of the cross-sectional shape of the first slit 81 perpendicular to the gas flow direction in the width direction. Refer to Figure 4 and Figure 5 , when the cross-sectional shape of the first slit 81 perpendicular to the gas flow direction is rectangular, the dimension in the width direction is the width of the rectangle.

[0078] By setting the range of the dimension A of the first slit 81 in the width direction to be 0.03 mm ≤ A ≤ 0.8 mm, when the gas in the accommodation space 53 is discharged through the first slit 81, the electrolyte vapor in the accommodation space 53 can obtain a relatively fast flow rate after being adjusted by the first slit 81, can evaporate quickly, is not easy to condense to form smoke, which is beneficial to improving the use experience of the battery device 2. In contrast, when the dimension A of the first slit 81 in the width direction is too large, for example, exceeding 0.8 mm, the flow rate of the electrolyte vapor will decrease, and thus it may be easy to condense to form smoke. If the dimension A of the first slit 81 in the width direction is too small, for example, less than 0.03 mm, it may easily cause the electrolyte vapor in the accommodation space to not be discharged smoothly, resulting in excessive pressure in the accommodation space and causing safety problems.

[0079] A set of round holes may include at least one first round hole 82. Refer to Figure 6 , the first round hole 82 may refer to a hole-shaped structure with a circular cross-sectional area. By setting the range of the diameter R of the first round hole 82 to be 0.03 mm ≤ R ≤ 0.8 mm, when the gas in the accommodation space 53 is discharged through the first round hole 82, the electrolyte vapor in the accommodation space 53 can obtain a relatively fast flow rate after being adjusted by the first round hole 82, can evaporate quickly, is not easy to condense to form smoke, which is beneficial to improving the use experience of the battery device 2. In contrast, when the diameter R of the first round hole 82 is too large, for example, exceeding 0.8 mm, the flow rate of the electrolyte vapor will decrease, and it may be easy to condense to form smoke. If the diameter R of the first round hole 82 is too small, for example, less than 0.03 mm, it may easily cause the electrolyte vapor in the accommodation space to not be discharged smoothly, resulting in excessive pressure in the accommodation space and causing safety problems.

[0080] In the above structure, since the exhaust mechanism forms the first slit 81 and / or the first round hole 82 for discharging the gas in the accommodation space to the outside atmosphere, and the range of the dimension A of the first slit 81 in the width direction is 0.03 mm ≤ A ≤ 0.8 mm, and the range of the diameter R of the first round hole 82 is 0.03 mm ≤ R ≤ 0.8 mm, the electrolyte vapor generated by the battery cell 6 in the thermal runaway state can obtain a relatively fast flow rate after being adjusted by the first slit 81 and / or the first round hole 82, can evaporate quickly, is not easy to condense to form smoke, which is beneficial to improving the use experience of the battery device.

[0081] In some embodiments, refer to Figure 7 , the box body 5 includes a first box wall 54, and the exhaust mechanism 8 includes a first slit 81 provided on the first box wall 54, and the first slit 81 communicates the outside with the accommodation space 53.

[0082] The first box wall 54 may be a wall structure in the box body 5, and the first slit 81 may be an opening for communicating with the outside air. By providing the first slit 81 which is normally open on the first box wall 54, the first slit 81 communicates the outside with the accommodation space 53, so that the electrolyte vapor in the accommodation space 53 can diffuse into the outside air more quickly through the first slit 81, and is not easy to condense to form smoke, which is conducive to improving the user experience of the battery device 2. Exemplarily, the exhaust mechanism 8 may also include a first circular hole 82 provided on the first box wall 54, and the first circular hole 82 communicates the outside with the accommodation space 53.

[0083] For example, reference Figure 8 In some embodiments, along the flow direction of the electrolyte vapor on the exhaust path, multiple exhaust mechanisms 8 may be sequentially arranged. In some embodiments, along the flow direction of the electrolyte vapor on the exhaust path, multiple first box walls 54 provided with exhaust mechanisms 8 may be spaced apart, and the electrolyte vapor in the accommodating space 53 may sequentially flow through the exhaust mechanisms 8 on the multiple first box walls 54 and be discharged to the outside of the box body 5.

[0084] In some embodiments, reference Figure 9 The box body 5 includes a first box wall 54. When the exhaust mechanism 8 includes a group of slits, the exhaust mechanism 8 includes a cover body 83 and an exhaust hole 542 arranged on the first box wall 54. The cover body 83 is connected to the first box wall 54 and is spaced apart from the first box wall 54 along the axial direction of the exhaust hole 542. A first slit 81 is formed between the cover body 83 and the first box wall 54, and the first slit 81 is connected to the accommodating space 53 through the exhaust hole 542.

[0085] The first box wall 54 may be a wall structure in the box body 5. The exhaust hole 542 may be a through hole structure opened on the first box wall 54, which is used to connect the accommodating space 53 with the outside air. Figure 10 The cover body 83 may be a plate structure spaced apart from the first box wall 54. The cover body 83 is spaced apart from the first box wall 54 along the axial direction of the exhaust hole 542 and is arranged opposite to the exhaust hole 542, so that a first slit 81 connected to the exhaust hole 542 is formed between the cover body 83 and the first box wall 54, so that the first slit 81 is connected to the accommodating space 53, so that the electrolyte vapor in the accommodating space 53 can diffuse into the outside air through the exhaust hole 542 and the first slit 81.

[0086] Exemplarily, the cover body 83 can be located in the accommodating space 53 and spaced apart from the first box wall 54 along the axial direction of the exhaust hole 542; the cover body 83 can also be located on the side of the first box wall 54 away from the accommodating space 53 and spaced apart from the first box wall 54 along the axial direction of the exhaust hole 542.

[0087] In some embodiments, the cover body 83 can be directly opposite to the exhaust hole 542 along the axial direction of the exhaust hole 542, such that the first slit 81 is a cylindrical surface structure surrounding the exhaust hole 542, enabling smooth exhaust in all radial directions of the first slit 81.

[0088] In some implementations, referring to Figure 11 , the exhaust mechanism 8 further includes a valve seat 84. The cover body 83 is connected to the first tank wall 54 through the valve seat 84, and the cover body 83 is located on the side of the first tank wall 54 away from the accommodation space 53.

[0089] The valve seat 84 can be a component for connecting the cover body 83 to the first tank wall 54, which enables the cover body 83 to be stably connected to the first tank wall 54, facilitating the maintenance of the stable shape of the first slit 81.

[0090] By disposing the cover body 83 on the side of the first tank wall 54 away from the accommodation space 53, the electrolyte vapor discharged from the accommodation space 53 can smoothly diffuse into the external air through the exhaust hole 542 and the first slit 81, which is beneficial to improving the diffusion effect of the electrolyte vapor in the external air.

[0091] Exemplarily, the valve seat 84 can be welded to the side of the first tank wall 54 facing away from the accommodation space 53, or can be adhered to the side of the first tank wall 54 facing away from the accommodation space 53. Exemplarily, the valve seat 84 can also be connected to the side of the first tank wall 54 facing away from the accommodation space 53 through components such as connecting bolts and connecting pins.

[0092] In some embodiments, referring to Figure 12 , the valve seat 84 includes a seat body 841 and a support body 842. The seat body 841 is connected to the side of the first tank wall 54 away from the accommodation space 53 and surrounds the outside of the exhaust hole 542 to form a communication cavity 8411. The support body 842 is connected to the seat body 841 and the cover body 83. The cover body 83 is disposed at an interval on the side of the seat body 841 away from the first tank wall 54. A first slit 81 is formed between the cover body 83 and the seat body 841, and the first slit 81 is communicated with the exhaust hole 542 through the communication cavity 8411.

[0093] The seat body 841 can be the main structure in the valve seat 84, which is used to connect to the side of the first box body 51 away from the accommodation space 53. The support member can be a structure in the valve seat 84 that is connected to the seat body 841 for connecting to the cover body 83 to support the cover body 83.

[0094] Since the seat body 841 is connected to the side of the first box body 51 away from the accommodation space 53, the cover body 83 is connected to the seat body 841 through the valve seat 84 and is disposed at an interval on the side of the seat body 841 away from the first box wall 54, so that a first slit 81 is formed between the cover body 83 and the seat body 841. The seat body 841 is wound around the outside of the exhaust hole 542, so that the seat body 841 forms a communication cavity 8411 with two open ends, wherein one open end communicates with the accommodation space 53 through the exhaust hole 542, and the other open end communicates with the first slit 81, so that the communication cavity 8411 can lead the electrolyte vapor in the accommodation space 53 to the outside away from the accommodation space 53, which is beneficial to better diffuse the electrolyte vapor into the outside air away from the outside of the accommodation space 53.

[0095] In some embodiments, at least a part of the support body 842 is located in the communication cavity 8411, and the support body 842 is connected to the inner wall surface of the communication cavity 8411 and the wall surface of the cover body 83 facing the seat body 841.

[0096] By disposing at least a part of the support body 842 in the communication cavity 8411 and connecting the support body 842 between the inner wall surface of the communication cavity 8411 and the wall surface of the cover body 83 facing the seat body 841, it is beneficial to improve the space utilization rate of the valve seat 84.

[0097] In some embodiments, the valve seat 84 and the cover body 83 are of an integrally formed structure.

[0098] The valve seat 84 and the cover body 83 being of an integrally formed structure may be that the valve seat 84 and the cover body 83 are made by an integrally formed processing method such as injection molding, so that the valve seat 84 and the cover body 83 can be manufactured synchronously as a whole. This not only makes the processing and manufacturing of the valve seat 84 and the cover body 83 convenient, but also makes the overall structure of the valve seat 84 and the cover body 83 have good strength. Exemplarily, the valve seat 84 and the cover body 83 can also be made by machining methods such as milling, by processing a whole blank.

[0099] In some embodiments, referring to Figure 13 , when the exhaust mechanism 8 includes a group of slits, the exhaust mechanism 8 includes a valve seat 84 having a seat body 841, an elastic member 85, and a cover body 83. The seat body 841 is connected to the box body 5, and the seat body 841 has a communication cavity 8411 communicating with the accommodation space 53. The elastic member 85 is connected between the cover body 83 and the seat body 841 and presses the cover body 83 against the seat body 841; referring to Figure 14 , the elastic member 85 is configured to deform when the internal pressure in the accommodation space 53 reaches a threshold value, so as to move the cover body 83 and form a first slit 81 communicating with the communication cavity 8411 between the cover body 83 and the seat body 841.

[0100] The seat body 841 can be the seat body 841 in the valve seat 84 provided by the foregoing technical solution. It is connected to the box body 5 and encloses a communication cavity 8411. The communication cavity 8411 communicates with the accommodation space 53 through an exhaust hole 542 provided on the box body 5. The cover body 83 can be the cover body 83 provided by the foregoing technical solution. It is arranged on the side of the seat body 841 away from the first box wall 54.

[0101] The elastic member 85 can be a component that can use its own elastic restoring force to make the cover body 83 abut against the seat body 841. By connecting the elastic member 85 to the cover body 83 and the seat body 841, the cover body 83 can abut against the seat body 841, realizing the covering of the opening of the communication cavity 8411 facing away from the accommodation space 53.

[0102] By configuring the elastic member 85 to elastically deform when the internal pressure of the accommodation space 53 reaches a threshold value, the cover body 83 can move when the internal pressure of the accommodation space 53 reaches the threshold value, so as to form a first slit 81 communicating with the communication cavity 8411 between the cover body 83 and the seat body 841. When the internal pressure of the accommodation space 53 reaches the threshold value, the electrolyte vapor in the accommodation space 53 can be discharged to the outside air through the exhaust hole 542, the communication cavity 8411 and the first slit 81, realizing the rapid diffusion in the outside air.

[0103] In some embodiments, the valve seat 84 further includes a support body 842. The support body 842 and the elastic member 85 are located in the communication cavity 8411. The support body 842 is connected to the inner wall surface of the communication cavity 8411, and the elastic member 85 is connected between the support body 842 and the cover body 83.

[0104] The support member can be the support body 842 in the valve seat 84 provided by the foregoing technical solution, which is used to support the cover body 83. By connecting the elastic member 85 between the support body 842 and the cover body 83, the valve seat 84 can better support the cover body 83 through the support body 842. By arranging the support body 842 and the elastic member 85 in the communication cavity 8411, it is beneficial to improve the utilization rate of the space.

[0105] In some embodiments, in a state where the pressure difference between the internal pressure of the accommodation space 53 and the external atmosphere pressure exceeds C, the cover body 83 moves and a first slit 81 is formed between the cover body 83 and the seat body 841, where 0.08 kPa ≤ C ≤ 40 kPa.

[0106] When the pressure difference between the internal pressure of the accommodation space 53 and the external atmosphere exceeds C, for example, when at least one battery cell 6 in the accommodation space 53 undergoes thermal runaway and the explosion-proof valve opens to release pressure, causing the pressure difference between the internal pressure of the accommodation space 53 and the external atmosphere to exceed C, the cover body 83 disengages from the seat body 841 under the action of the internal gas in the accommodation space 53 and moves away from the accommodation space 53, forming a gap between the cover body 83 and the seat body 841 to form the first slit 81.

[0107] When the pressure difference between the internal pressure of the accommodation space 53 and the external atmosphere exceeds C, the cover body 83 moves and a first slit 81 is formed between the cover body 83 and the seat body 841, enabling the electrolyte vapor in the accommodation space 53 to flow out of the first slit 81 at a faster flow rate under the action of the pressure difference, the electrolyte vapor diffuses faster, and can evaporate more quickly.

[0108] By setting the range of the pressure difference C as 0.08 kPa ≤ C ≤ 40 kPa, not only can the electrolyte vapor flow out of the first slit 81 at a relatively fast flow rate under the action of this pressure difference, but also it is not easy for the accommodation space 53 to have severe airtightness, which is beneficial to reducing the possibility of the battery device 2 bulging.

[0109] In some embodiments, the range of the pressure difference C can be set as 0.1 kPa ≤ C ≤ 30 kPa. Exemplarily, the pressure difference C between the internal pressure of the accommodation space 53 and the external atmosphere can be 10 kPa, 20 kPa or 25 kPa, which not only enables the electrolyte vapor to flow out of the first slit 81 at a relatively fast flow rate, but also it is not easy for the accommodation space 53 to have severe airtightness, which is beneficial to reducing the possibility of the battery device 2 bulging.

[0110] In some embodiments, the exhaust mechanism 8 further includes a limiting structure 86 connected to the seat body 841. Part of the limiting structure 86 is located on the side of the cover body 83 facing away from the seat body 841 and is spaced from the cover body 83, and the limiting structure 86 can block the cover body 83 disengaged from the seat body 841.

[0111] The limiting structure 86 can be a structure in the exhaust mechanism 8 for restricting the distance by which the cover body 83 disengages from the seat body 841. By connecting the limiting structure 86 to the seat body 841 and arranging part of the limiting structure 86 spaced from the side of the cover body 83 facing away from the seat body 841, the limiting structure 86 can block the cover body 83 disengaged from the seat body 841 to restrict the distance by which the cover body 83 disengages from the seat body 841.

[0112] In some embodiments, the limiting structure 86 includes a connecting portion 861, an extending portion 862, and a blocking portion 863. The extending portion 862 is connected between the blocking portion 863 and the connecting portion 861, and the connecting portion 861 is connected to the seat body 841. The blocking portion 863 is located on the side of the cover body 83 away from the seat body 841 for blocking the cover body 83.

[0113] The connecting portion 861, the extending portion 862, and the blocking portion 863 are respectively different parts of the limiting structure 86. Among them, the connecting portion 861 is connected to the seat body 841, and the extending portion 862 is connected between the blocking portion 863 and the connecting portion 861, so that the blocking portion 863 can be located on the side of the cover body 83 away from the seat body 841 under the support and guidance of the extending portion 862, so that the blocking portion 863 can block the cover body 83 from the side far from the seat body 841.

[0114] Exemplarily, the limiting structure 86 can be an integrally formed structure.

[0115] The limiting structure 86 being an integrally formed structure can be that the connecting portion 861, the extending portion 862, and the blocking portion 863 are made by an integrally formed processing method such as injection molding, so that the connecting portion 861, the extending portion 862, and the blocking portion 863 can be manufactured synchronously as a whole. This not only makes the processing and manufacturing of the limiting structure 86 convenient, but also makes the overall structure of the limiting structure 86 have good strength. Exemplarily, the limiting structure 86 can also be made by machining methods such as milling, by processing a whole blank.

[0116] In some embodiments, in the state where the cover body 83 abuts against the seat body 841, along the arrangement direction of the cover body 83 and the seat body 841, the distance between the blocking portion 863 and the cover body 83 is A.

[0117] In the state where the cover body 83 abuts against the seat body 841, by setting the distance between the blocking portion 863 and the cover body 83 along the arrangement direction of the cover body 83 and the seat body 841 to be A, the distance at which the blocking portion 863 disengages from the seat body 841 can be limited to A, so that when the cover body 83 disengages from the seat body 841, the size of the first slit 81 formed between the seat bodies 841 in the width direction is A.

[0118] Exemplarily, in the state where the exhaust mechanism 8 includes a group of slits, the range of the size A of the first slit 81 in the width direction can be set to 0.05 mm ≤ A ≤ 0.5 mm. Exemplarily, the size A of the first slit 81 in the width direction can be 0.2 mm, 0.3 mm, or 0.4 mm. This not only makes the size of the first slit 81 in the width direction smaller, so that the electrolyte vapor can obtain a faster flow rate when discharging from the first slit 81, but also makes the first slit 81 have a sufficient size in the width direction, so that the electrolyte vapor is not easy to accumulate in the accommodation space 53 and can be discharged more smoothly.

[0119] Exemplarily, in a state where the exhaust mechanism 8 includes a group of round holes, the range of the diameter R of the first round hole 82 can be set to 0.05 mm ≤ R ≤ 0.5 mm. Exemplarily, the diameter R of the first round hole 82 can be 0.2 mm, 0.3 mm or 0.4 mm, which not only makes the size of the first round hole 82 in the width direction smaller, so that the electrolyte vapor can obtain a faster flow rate when discharged from the first slit 81, but also makes the first round hole 82 have a sufficient size in the width direction, so that the electrolyte vapor is not easily accumulated in the accommodation space 53 and can be discharged more smoothly.

[0120] In some embodiments, continue to refer to Figure 4 and Figure 5 , a convex structure 811 is provided at the first slit 81.

[0121] The convex structure 811 may be a structure protruding from the edge of the first slit 81 into the first slit 81. By providing the convex structure 811 at the first slit 81, it is easier to form a turbulent flow when the air flow flows out from the first slit 81, which is beneficial to improving the diffusibility of the electrolyte vapor, enabling the electrolyte vapor to evaporate more quickly, and making it less likely to form smoke when the electrolyte vapor is discharged from the first slit 81.

[0122] Exemplarily, the cross-sectional shape of the convex structure 811 can be rectangular, triangular, or arc-shaped.

[0123] In some embodiments, referring to Figure 15 , the box body 5 includes a first box wall 54 and a second box wall 55. The second box wall 55 encloses an accommodation space 53, and the first box wall 54 is connected to the second box wall 55 and encloses an exhaust space with the second box wall 55; the battery device 2 further includes a pressure relief mechanism 9, and the pressure relief mechanism 9 is disposed on the second box wall 55. In the closed state, the pressure relief mechanism 9 is used to maintain the waterproof seal of the accommodation space 53, and when the internal pressure of the accommodation space exceeds a preset pressure value, the pressure relief mechanism 9 is opened and the accommodation space 53 is communicated with the exhaust space, and the exhaust mechanism 8 is disposed on the first box wall 54.

[0124] Both the first box wall 54 and the second box wall 55 are wall structures in the box body 5. Among them, the second box wall 55 can be a wall body for enclosing the accommodation space 53 for accommodating the battery cell 6, and the first box wall 54 is connected to the second box wall 55 and encloses an exhaust space with the second box wall 55. By disposing the pressure relief mechanism 9 on the second box wall 55 and the exhaust mechanism 8 on the first box wall 54, in the state where the pressure relief mechanism 9 is opened, the exhaust mechanism 8 can be communicated with the accommodation space 53 through the exhaust space and the pressure relief mechanism 9, so that the electrolyte vapor in the accommodation space 53 can enter the external air after passing through the pressure relief mechanism 9, the exhaust space and the exhaust mechanism 8 in sequence.

[0125] The pressure relief mechanism 9 can be a mechanism provided on the second box wall 55 for relieving the internal pressure of the accommodation space 53, such as a one-way valve, a balance valve, etc. When the internal pressure of the accommodation space 53 reaches or exceeds a preset value, the pressure relief mechanism 9 can reduce the internal pressure of the accommodation space 53 by discharging the discharge substance inside the accommodation space 53 to the outside of the accommodation space 53.

[0126] By arranging the exhaust mechanism 8 on the first box wall 54 located outside the second box wall 55, and arranging the pressure relief mechanism 9 on the second box wall 55, the arrangement of the exhaust mechanism 8 on the first box wall 54 does not affect the waterproof sealability of the accommodation space 53 enclosed by the second box wall 55.

[0127] Exemplarily, there can be multiple first box walls 54 provided with the exhaust mechanism 8 at intervals, and the multiple first box walls 54 provided with the exhaust mechanism 8 are arranged outside the second box wall 55 provided with the pressure relief mechanism 9.

[0128] In some embodiments, when the exhaust mechanism 8 includes a set of first slits 81, the total cross-sectional area of the set of first slits 81 is B, 30mm 2 ≤B≤100mm 2 .

[0129] By setting the range of the total area B of all the first slits 81 in a set of slits to 30mm 2 ≤B≤100mm 2 , it not only makes it difficult for the electrolyte vapor to accumulate in the accommodation space 53 due to the too small total area of a set of first slits 81 and can be discharged smoothly, but also makes it difficult for a set of first slits 81 to cause a decrease in the discharge speed of the electrolyte vapor due to the too large total area. The total area B of a set of first slits 81 can be set to 50mm 2 , 60mm 2 or 80mm 2 , it not only makes it difficult for the electrolyte vapor to accumulate in the accommodation space 53 due to the too small total area of a set of first slits 81 and can be discharged smoothly, but also makes it difficult for a set of first slits 81 to cause a decrease in the discharge speed of the electrolyte vapor due to the too large total area.

[0130] In some embodiments, when the exhaust mechanism 8 includes a set of first round holes 82, the total cross-sectional area of the set of first round holes 82 is D, 30mm 2 ≤D≤100mm 2 .

[0131] By setting the range of the total area D of all the first round holes 82 in a set of round holes to 30mm 2 ≤D≤100mm 2, which not only makes it difficult for the electrolyte vapor to accumulate in the accommodation space 53 due to the too small total area of the first round holes 82 and enables it to be discharged smoothly, but also makes it difficult for a group of first round holes 82 to cause a decrease in the discharge speed of the electrolyte vapor due to the too large total area. The total cross-sectional area D of a group of first round holes 82 can be set to 50mm 2 , 60mm 2 or 80mm 2 , which not only makes it difficult for the electrolyte vapor to accumulate in the accommodation space 53 due to the too small total area of the first round holes 82 and enables it to be discharged smoothly, but also makes it difficult for a group of first round holes 82 to cause a decrease in the discharge speed of the electrolyte vapor due to the too large total area.

[0132] In some embodiments, when the exhaust mechanism 8 includes a group of slits, there are a plurality of first slits 81, and the plurality of first slits 81 are arranged at intervals.

[0133] Arranging a plurality of first slits 81 at intervals on the box body 5 of the battery device 2 may mean that the total area of a group of slits remains unchanged, but the first slits 81 are divided into a plurality of intervals, which makes the distribution of the first slits 81 more dispersed and is beneficial to improving the uniformity of exhaust.

[0134] In some embodiments, when the exhaust mechanism 8 includes a group of round holes, there are a plurality of first round holes 82, and the plurality of first round holes 82 are arranged at intervals.

[0135] Arranging a plurality of first round holes 82 at intervals on the box body 5 of the battery device 2 may mean that the total area of a group of round holes remains unchanged, but the first slits 81 are divided into a plurality of intervals, which makes the distribution of the first slits 81 more dispersed and is beneficial to improving the uniformity of exhaust.

[0136] Some embodiments of the present application further provide an electrical device, which includes the battery device 2 provided by the above technical solution, and the battery device 2 is used to provide electrical energy.

[0137] The electrical device can be any of the foregoing devices or systems using the battery device 2.

[0138] According to some embodiments of the present application, the present application provides a battery device 2, which includes battery cells 6, a box body 5, and an exhaust mechanism 8. The box body 5 includes a first box wall 54, and the exhaust mechanism 8 includes a valve seat 84, an elastic member 85, a cover body 83, and an exhaust hole 542 provided on the first box wall 54. A seat body 841 of the valve seat 84 is wound around the outer periphery of the exhaust hole 542 to form a communication cavity 8411. A support body 842 of the valve seat 84 is connected to the seat body 841. The elastic member 85 is connected to the cover body 83 and the support body 842. The elastic member 85 is configured to deform when the internal pressure in the accommodation space 53 reaches a threshold value, so that the cover body 83 moves, and a first slit 81 communicating with the communication cavity 8411 is formed between the cover body 83 and the seat body 841. The size of the first slit 81 in the width direction is A, and 0.03 mm ≤ A ≤ 0.8 mm, so that the electrolyte vapor generated by the battery cell 6 in a thermal runaway state can be discharged through the first slit 81 at a relatively fast flow rate. The electrolyte vapor diffuses relatively fast, can evaporate quickly, is not easy to condense into smoke, which is beneficial to improving the use experience of the battery device 2.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present 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, Comprising: Battery cell; A box body having an accommodation space, the battery cell being disposed in the accommodation space, the box body being provided with an exhaust mechanism for communicating the accommodation space with the outside. In the open state, the exhaust mechanism includes a set of slits, the set of slits including at least one first slit, the maximum dimension of each first slit in the width direction being A, where 0.03 mm ≤ A ≤ 0.8 mm, and / or, The exhaust mechanism includes a set of round holes, the set of round holes including at least one first round hole, the diameter of each first round hole being R, where 0.03 mm ≤ R ≤ 0.8 mm.

2. The battery device according to claim 1, characterized in that, The box body includes a first box wall. In the state where the exhaust mechanism includes the set of slits, the exhaust mechanism includes a cover body and an exhaust hole provided on the first box wall. The cover body is connected to the first box wall and is spaced from the first box wall along the axial direction of the exhaust hole. A first slit is formed between the cover body and the first box wall, and the first slit communicates with the accommodation space through the exhaust hole.

3. The battery device according to claim 2, characterized in that, The exhaust mechanism further includes a valve seat, and the cover body is connected to the first box wall through the valve seat, and the cover body is located on the side of the first box wall away from the accommodation space.

4. The battery device according to claim 3, wherein The valve seat includes a seat body and a support body. The seat body is connected to the side of the first box wall away from the accommodation space and surrounds the outside of the exhaust hole to form a communication cavity. The support body is connected to the seat body and the cover body. The cover body is spaced from the seat body on the side away from the first box wall, and a first slit is formed between the cover body and the seat body, and the first slit communicates with the exhaust hole through the communication cavity.

5. The battery device according to claim 4, characterized in that, At least a part of the support body is located in the communication cavity, and the support body is connected to the inner wall surface of the communication cavity and the wall surface of the cover body facing the seat body.

6. The battery device according to claim 3, characterized in that, The valve seat and the cover body are of an integrally formed structure.

7. The battery device according to claim 1, characterized in that, In the state where the exhaust mechanism includes the set of slits, the exhaust mechanism includes a valve seat having a seat body, an elastic member, and a cover body. The seat body is connected to the box body, and the seat body has a communication cavity communicating with the accommodation space. The elastic member is connected between the cover body and the seat body and causes the cover body to abut against the seat body; The elastic member is configured to deform when the internal pressure in the accommodation space reaches a threshold value, so that the cover body moves, and a first slit communicating with the communication cavity is formed between the cover body and the seat body.

8. The battery device according to claim 7, characterized in that, The valve seat further includes a support body. The support body and the elastic member are located in the communication cavity. The support body is connected to the inner wall surface of the communication cavity, and the elastic member is connected between the support body and the cover body.

9. The battery device according to claim 7, wherein, In the state where the pressure difference between the internal pressure in the accommodation space and the outside atmosphere exceeds the pressure of the outside atmosphere by C, the cover body moves and a first slit is formed between the cover body and the seat body, where 0.08 kPa ≤ C ≤ 40 kPa.

10. The battery device according to claim 7, characterized in that, The exhaust mechanism also includes a limiting structure connected to the seat body, part of the limiting structure is located on the side of the cover body away from the seat body and is spaced apart from the cover body, and the limiting structure can block the cover body from detaching from the seat body.

11. The battery device according to claim 10, wherein The limiting structure includes a connecting portion, a protruding portion and a blocking portion, wherein the protruding portion is connected between the blocking portion and the connecting portion, the connecting portion is connected to the seat body, and the blocking portion is located on a side of the cover body away from the seat body for blocking the cover body.

12. The battery device according to claim 11, characterized in that, When the cover body is against the base body, the distance between the blocking portion and the cover body is A along the arrangement direction of the cover body and the base body.

13. The battery device according to claim 1, characterized in that, When the exhaust mechanism includes the group of slits, 0.05 mm ≤ A ≤ 0.5 mm; when the exhaust mechanism includes the group of circular holes, 0.05 mm ≤ R ≤ 0.5 mm.

14. The battery device according to claim 1, characterized in that, When the exhaust mechanism includes the group of slits, a protruding structure is provided at the first slit.

15. The battery device according to claim 1, wherein The box body includes a first box wall and a second box wall, the second box wall enclosing the accommodation space, the first box wall being connected to the second box wall and enclosing an exhaust space with the second box wall; the battery device also includes a pressure relief mechanism, the pressure relief mechanism is arranged on the second box wall for connecting the accommodation space with the exhaust space, and the exhaust mechanism is arranged on the first box wall.

16. The battery device according to claim 1, characterized in that, When the exhaust mechanism includes a set of slits, the total cross-sectional area of the set of slits is B, 30 mm 2 ≤B≤100 mm 2 ; when the exhaust mechanism includes a set of round holes, the total cross-sectional area of the set of round holes is B, 30 mm 2 ≤D≤100 mm 2 .

17. The battery device according to claim 1, characterized in that, When the exhaust mechanism includes the group of slits, a plurality of first slits are provided, and the plurality of first slits are arranged at intervals; when the exhaust mechanism includes the group of circular holes, a plurality of first circular holes are provided, and the plurality of first circular holes are arranged at intervals.

18. An electrical device, characterized in that, The battery device comprises a battery device as claimed in any one of claims 1 to 17, wherein the battery device is used to provide electrical energy.

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