Battery device and electric device

Abstract

A battery device (2) and an electric device. The battery device (2) comprises battery cells (6) and a case (5), wherein the case (5) has an accommodating space (53), the battery cells (6) are arranged in the accommodating space (53), the case (5) is provided with a venting mechanism (8), and the venting mechanism (8) is configured to communicate the accommodating space (53) with the outside. In an open state, the venting mechanism (8) comprises a group of slits, wherein the group of slits comprises at least one first slit (81), and the maximum dimension of each first slit (81) in the direction of width is A, satisfying 0.03 mm≤A≤0.8 mm; and / or the venting mechanism (8) comprises a group of circular holes, wherein the group of circular holes comprises at least one first circular hole (82), and the diameter of each first circular hole (82) is R, satisfying 0.03 mm≤R≤0.8 mm. By means of providing the first slits (81) and / or the first circular holes (82) in the venting mechanism (8), and adjusting the dimensions of the first slits (81) and / or the first circular holes (82) to be within a preset range, electrolyte vapor generated by the battery cells (6) under thermal runaway conditions can be discharged at a relatively high flow rate, and the electrolyte vapor diffuses rapidly, can be quickly evaporated, and is less likely to be condensed into fume, thereby being conducive to improving the use experience of the battery device.

Description

Battery device and electric device TECHNICAL FIELD

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

[0002] Batteries have high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] With the continuous development of battery technology, the application range of batteries is becoming wider and wider, and people's requirements for the use experience of batteries are becoming higher and higher.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery device and an electric device, and the use experience of the battery device is good.

[0006] In a first aspect, some embodiments of the present application provide a battery device, which comprises a battery monomer and a box body, the box body has a containing space, and the battery monomer is arranged in the containing space; the box body is provided with an exhaust mechanism, the exhaust mechanism is used for connecting the containing space with the outside, and in an open state, the exhaust mechanism comprises a group of slits, the group of slits comprises at least one first slit, the maximum size of each first slit in the width direction is A, and 0.03mm≤A≤0.8mm, and / or the exhaust mechanism comprises a group of round holes, the group of round holes comprises at least one first round hole, and the diameter of each first round hole is R, and 0.03mm≤R≤0.8mm.

[0007] In the above structure, since the exhaust mechanism forms the first slit and / or the first round hole for exhausting the gas in the containing space to the outside atmosphere, and the size A of the first slit in the width direction is in the range of 0.03mm≤A≤0.8mm, and the diameter R of the first round hole is in the range of 0.03mm≤R≤0.8mm, the electrolyte vapor generated by the battery monomer in the thermal runaway state can be exhausted at a faster flow rate, the electrolyte vapor diffuses faster, can evaporate quickly, and is not easy to condense to form smoke, which is beneficial to improve the use experience of the battery device.

[0008] According to the battery device provided by some embodiments of the present application, when the exhaust mechanism comprises a set of slits, the box comprises a first box wall, the exhaust mechanism comprises a cover and an exhaust hole arranged on the first box wall, the cover is connected to the first box wall and is arranged in a spaced manner along the axial direction of the exhaust hole, a first slit is formed between the cover and the first box wall, the first slit is communicated with the accommodation space through the exhaust hole, and the cover and the first box wall form the first slit communicated with the exhaust hole, so that the first slit is communicated with the accommodation space, and electrolyte vapor in the accommodation space can diffuse into the external air through the exhaust hole and the first slit.

[0009] According to the battery device provided by some embodiments of the present application, the exhaust mechanism further comprises 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, electrolyte vapor exhausted from the accommodation space can smoothly diffuse into the external air through the exhaust hole and the first slit, and the diffusion effect of the electrolyte vapor in the external air is improved.

[0010] According to the battery device provided by some embodiments of the present application, the valve seat comprises 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 arranged in a spaced manner on the side of the seat body away from the first box wall, a first slit is formed between the cover and the seat body, the first slit is communicated with the exhaust hole through the communication cavity, and the communication cavity can guide electrolyte vapor in the accommodation space to the outside away from the accommodation space, so that the electrolyte vapor can better diffuse into the external air on the outside away from the accommodation space.

[0011] 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, and 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, so as to improve the utilization rate of the valve seat to the space.

[0012] According to the battery device provided by some embodiments of the present application, the valve seat and the cover are in an integrated structure, so that the overall structure of the valve seat and the cover has good strength.

[0013] According to the battery device provided by some embodiments of the present application, in the case that the exhaust mechanism comprises a set of slits, the exhaust mechanism comprises a valve seat with a seat body, an elastic member and a cover body, the seat body is connected to the box body, the seat body has a communication cavity in communication with the accommodation space, the elastic member is connected between the cover body and the seat body and makes the cover body abut against the seat body; the elastic member is configured to deform when the internal pressure of the accommodation space reaches a threshold value, so as to move the cover body and form a first slit between the cover body and the seat body in communication with the communication cavity, so that when the internal pressure of 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, and rapid diffusion of the external air is achieved.

[0014] According to the battery device provided by some embodiments of the present application, the valve seat further comprises 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. By arranging the support body and the elastic member in the communication cavity, the utilization rate of the space is improved.

[0015] According to the battery device provided by some embodiments of the present application, in the case that the pressure difference between the internal pressure of the accommodation space and the pressure of the external atmosphere is C, the cover body moves and a first slit is formed between the cover body and the seat body, wherein 0.08kPa≤C≤40kPa, so that the electrolyte vapor can be discharged from the first slit at a relatively fast flow rate under the action of the pressure difference, and serious gas retention in the accommodation space is less likely to occur, which is beneficial to reducing the possibility of swelling of the battery device.

[0016] According to the battery device provided by some embodiments of the present application, the exhaust mechanism further comprises 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 arranged in a spaced manner with the cover body, and the limiting structure can block the cover body separated from the seat body to limit the distance of the cover body separated from the seat body.

[0017] According to the battery device provided by some embodiments of the present application, the limiting structure comprises a connecting portion, a protruding portion and a blocking portion, 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 the side of the cover body away from the seat body for blocking the cover body.

[0018] According to the battery device provided by some embodiments of the present application, in the case that the cover body abuts against the seat body, the distance between the blocking portion and the cover body along the arrangement direction of the cover body and the seat body is A, so that the distance of the cover body separated from the seat body can be limited to A, and thus the cover body is separated from the seat body, and the size of the first slit formed between the seat body in the width direction is A.

[0019] According to the battery device provided by some embodiments of the present application, in the case that the exhaust mechanism comprises a group of slits, 0.05mm≤A≤0.5mm; in the case that the exhaust mechanism comprises a group of circular holes, 0.05mm≤R≤0.5mm.

[0020] According to the battery device provided by some embodiments of the present application, the first slit is provided with a convex structure, so that the airflow is more likely to form a turbulent flow when flowing out of the first slit, which is beneficial to improve the diffusivity of the electrolyte vapor, so that the electrolyte vapor can evaporate more quickly, and the electrolyte vapor is less likely to form smoke when flowing out of the first slit.

[0021] According to the battery device provided by some embodiments of the present application, the box body comprises a first box wall and a second box wall, the second box wall encloses a containing space, and the first box wall is connected to the second box wall and encloses an exhaust space with the second box wall; the battery device further comprises a pressure relief mechanism arranged on the second box wall for communicating the containing 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 outside the second box wall and arranging the pressure relief mechanism on the second box wall, the arrangement of the exhaust mechanism on the first box wall does not affect the sealing performance of the containing space enclosed by the second box wall.

[0022] According to the battery device provided by some embodiments of the present application, in the case that the exhaust mechanism comprises a group of slits, the total cross-sectional area of the group of slits is B, 30mm 2 ≤B≤100mm 2 ; in the case that the exhaust mechanism comprises a group of circular holes, the total cross-sectional area of the group of circular holes is B, 30mm 2 ≤D≤100mm 2 , so that the electrolyte vapor is less likely to accumulate in the containing space and can be smoothly discharged, and the exhaust mechanism is less likely to cause the speed of the electrolyte vapor to decrease due to the excessively large ventilation area, or the electrolyte vapor in the containing space cannot be smoothly discharged due to the excessively small ventilation area, so that the pressure in the containing space is too large to cause safety problems.

[0023] According to the battery device provided by some embodiments of the present application, in the case that the exhaust mechanism comprises a group of slits, a plurality of first slits are arranged, and the plurality of first slits are arranged at intervals; in the case that the exhaust mechanism comprises a group of circular holes, a plurality of first circular holes are arranged, and the plurality of first circular holes are arranged at intervals, which makes the distribution of the first slits or the first circular holes more dispersed, and is beneficial to improve the uniformity of the exhaust.

[0024] In a second aspect, some embodiments of the present application provide a power utilization device, which comprises the battery device provided by any of the technical solutions described above, and the battery device is used to provide electric energy.

[0025] The embodiments of the present application provide technical solutions with at least the following beneficial effects:

[0026] Some embodiments of the present application provide a battery device, which comprises a battery cell and a box body, the box body has a containing space, the battery cell 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, in an open state, the exhaust mechanism comprises a group of slits, the group of slits comprises at least one first slit, the maximum size of each first slit in the width direction is A, 0.03mm≤A≤0.8mm, 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 of each first round hole is R, 0.03mm≤R≤0.8mm. In the above structure, since the exhaust mechanism forms the first slit and / or the first round hole for discharging the gas in the containing space to the outside atmosphere, and the size A of the first slit in the width direction ranges from 0.03mm to 0.8mm, and the diameter R of the first round hole ranges from 0.03mm to 0.8mm, so that the electrolyte vapor generated by the battery cell in the thermal runaway state can be discharged at a faster flow rate, the electrolyte vapor diffuses faster, can evaporate quickly, and is not easy to condense to form smoke, which is beneficial to improve the use experience of the battery device.

[0027] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not considered limiting of the present application. Moreover, like reference numerals denote same or similar components throughout the attached drawings. In the drawings:

[0029] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0030] Fig. 2 is an exploded view of a battery device provided by some embodiments of the present application;

[0031] Fig. 3 is an exploded view of a partial structure of a battery device provided by some embodiments of the present application;

[0032] Fig. 4 is an enlarged view of an exhaust port in a battery device provided by some embodiments of the present application;

[0033] Fig. 5 is an enlarged view of an exhaust port in a battery device provided by some other embodiments of the present application;

[0034] FIG. 6 is an enlarged view of the exhaust port in the battery device according to some embodiments of the present application;

[0035] FIG. 7 is a schematic view of the internal structure of the exhaust mechanism in the battery device according to some embodiments of the present application;

[0036] FIG. 8 is a schematic view of the structure of the box in the battery device according to some embodiments of the present application;

[0037] FIG. 9 is a schematic view of the internal structure of the exhaust mechanism in the battery device according to some embodiments of the present application;

[0038] FIG. 10 is a schematic view of the structure of the cover in the battery device according to some embodiments of the present application;

[0039] FIG. 11 is a schematic view of the internal structure of the exhaust mechanism in the battery device according to some embodiments of the present application;

[0040] FIG. 12 is a schematic view of the structure of the valve seat in the battery device according to some embodiments of the present application;

[0041] FIG. 13 is a schematic view of the internal structure of the exhaust mechanism in the battery device according to some embodiments of the present application when the exhaust port is not formed;

[0042] FIG. 14 is a schematic view of the internal structure of the exhaust mechanism in the battery device according to some embodiments of the present application when the exhaust port is formed;

[0043] FIG. 15 is a schematic view of the structure of the box in the battery device according to some embodiments of the present application.

[0044] In the drawings:

[0045] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, box; 51, first box; 52, second box; 53, accommodation space; 54, first box wall; 542, exhaust hole; 55, second box wall; 6, battery cell; 8, exhaust mechanism; 81, first slit; 82, first circular hole; 811, protruding structure; 83, cover; 84, valve seat; 841, seat body; 8411, communication cavity; 842, support body; 85, elastic member; 86, limiting structure; 861, connecting portion; 862, extending portion; 863, blocking portion; 9, pressure relief mechanism. DETAILED DESCRIPTION

[0046] In order to make the objects, 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 drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0048] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0049] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents a "or" relationship between the front and rear associated objects.

[0051] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0052] In embodiments of the present application, “parallel” includes not only the case of absolute parallel, but also the case of approximately parallel as generally recognized in engineering; meanwhile, “perpendicular” includes not only the case of absolute perpendicular, but also the case of approximately perpendicular as generally recognized in engineering. Illustratively, the included angle between two directions is 85°-90°, the two directions can be considered as perpendicular; the included angle between two directions is 0°-5°, the two directions can be considered as parallel.

[0053] “Multiple” appearing in the present application refers to two or more (including two).

[0054] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0055] The battery device mentioned in embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0056] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging.

[0057] 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 hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc.

[0058] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft package battery cell or other shaped battery cell, the prismatic battery cell includes a square cell, a blade cell, a multi-prismatic battery, such as a hexagonal prism battery, etc.

[0059] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0060] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and a battery cell, and the battery cell or the battery module is contained in the box body.

[0061] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0062] 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.

[0063] During use of the battery device, the battery cells inside the battery device are at risk of thermal runaway. When the battery cells undergo thermal runaway, the electrolyte in the battery cells will evaporate, and a large amount of electrolyte vapor will be mixed in the thermal runaway gas. The electrolyte vapor will condense to form smoke during discharge from the battery device, which not only reduces the visibility of the surrounding environment, but also seriously affects the use experience of the battery device.

[0064] To improve the use experience of the 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 containing space, and the battery cells are arranged in the containing space. The box body is provided with an exhaust mechanism for connecting the containing space with the outside. In the 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 0.03mm≤A≤0.8mm. In addition, 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 0.03mm≤R≤0.8mm. In the above structure, the exhaust mechanism forms the first slits and / or the first round holes for discharging the gas in the containing space to the outside atmosphere. The size A of the first slits in the width direction is in the range of 0.03mm≤A≤0.8mm, and the diameter R of the first round holes is in the range of 0.03mm≤R≤0.8mm. By setting the first slits and / or the first round holes in the exhaust mechanism and adjusting the size of the first slits and / or the first round holes to the preset range, the electrolyte vapor generated by the battery cells in the thermal runaway state can be discharged at a faster flow rate after adjustment through the first slits and / or the first round holes, which can evaporate quickly and is not easy to condense to form smoke. This is conducive to improving the use experience of the battery device.

[0065] The battery device described in the embodiments of the present application is suitable for use in an electric device using the battery device.

[0066] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0067] The following embodiments take a vehicle as an example for the convenience of description.

[0068] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application.

[0069] As shown in FIG. 1, the vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, the head, or the 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 an operating power supply of the vehicle 1.

[0070] The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the working power demand of the vehicle 1 during starting, navigation, and driving.

[0071] In some embodiments of the present application, the battery device 2 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0072] FIG. 2 is an exploded schematic diagram of a battery device according to some embodiments of the present application. As shown in FIG. 2, the battery device 2 includes a box body 5 and a battery cell 6, and the battery cell 6 is contained in the box body 5. The box body 5 is used to provide a containing space for the battery cell 6. The battery cell 6 in the battery device 2 can be multiple, and the multiple battery cells 6 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 6 are connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 6 is contained in the box body 5; of course, the battery device 2 can also be that the multiple battery cells 6 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is contained in the box body 5.

[0073] The box 5 can include a first box 51 and a second box 52, the first box 51 and the second box 52 are mutually covered to define a containing space 53 for containing the battery cell 6. The first box 51 and the second box 52 can be various shapes, such as a cuboid, a cylinder, etc. The first box 51 can be a hollow structure with one side open, and the second box 52 can also be a hollow structure with one side open, and the open side of the second box 52 covers the open side of the first box 51, thereby forming the box 5 with the containing space 53.

[0074] The battery device 2 can also include other structures, for example, the battery device 2 can also include a current collection component for realizing electrical connection between the plurality of battery cells 6.

[0075] As shown in FIG. 3, some embodiments of the present application provide a battery device 2, which includes a battery cell 6 and a box 5, the box 5 has a containing space 53, the battery cell 6 is arranged in the containing space 53, the box 5 is provided with an exhaust mechanism 8, the exhaust mechanism 8 is used for communicating the containing space 53 with the outside, in the open state, the exhaust mechanism 8 includes a group of slits, the group of slits includes at least one first slit 81, the maximum dimension of each first slit 81 along the width direction is A, 0.03mm≤A≤0.8mm, and / or, the exhaust mechanism 8 includes a group of round holes, the group of round holes includes at least one first round hole 82, the diameter of each first round hole 82 is R, 0.03mm≤R≤0.8mm.

[0076] The battery cell 6 can be the smallest unit capable of outputting electric energy as an independent power supply. The box 5 can be a component for enclosing the containing space 53, and the battery cell 6 is arranged in the containing space 53 in the box 5. The box 5 can be the first box 51 described in the foregoing technical solutions, or the second box 52 described in the foregoing technical solutions. The battery cell 6 in the battery device 2 can be provided in plurality, and the plurality of battery cells 6 can be connected in series, parallel or mixed connection, and the whole is contained in the containing space 53 of the box 5.

[0077] The exhaust mechanism 8 can be a mechanism for discharging gas in the containing space 53 to the outside air, which is used for discharging the gas in the containing space 53 to the outside air at a faster flow rate to diffuse quickly. The exhaust mechanism 8 is arranged on the box 5, and by forming a structure capable of communicating the containing space 53 with the outside air, the gas in the containing space 53 can be discharged to the outside air.

[0078] The set of slits can include at least one first slit 81, which can refer to a slit-shaped gap with an elongated cross-sectional area. In some examples, a gap with a length-to-width ratio greater than or equal to 10 can be referred to as 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 in the width direction perpendicular to the direction of gas flow. Referring to FIGS. 4 and 5, in a state where the cross-sectional shape of the first slit 81 perpendicular to the direction of gas flow is rectangular, the dimension in the width direction is the width of the rectangle.

[0079] By setting the dimension A of the first slit 81 in the width direction to be in the range of 0.03 mm≤A≤0.8 mm, the electrolyte vapor in the accommodation space 53 can be adjusted to obtain a faster flow rate when passing through the first slit 81, which can evaporate quickly and is less likely to condense to form smoke, thereby improving the user experience of the battery device 2. In contrast, if the dimension A of the first slit 81 in the width direction is too large, for example, greater than 0.8 mm, the flow rate of the electrolyte vapor can decrease, which can easily 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, the electrolyte vapor in the accommodation space can not be easily discharged, which can cause the pressure in the accommodation space to be too high, thereby causing safety problems.

[0080] The set of circular holes can include at least one first circular hole 82, which can refer to a hole-shaped structure with a circular cross-sectional area, as shown in FIG. 6. By setting the diameter R of the first circular hole 82 to be in the range of 0.03 mm≤R≤0.8 mm, the electrolyte vapor in the accommodation space 53 can be adjusted to obtain a faster flow rate when passing through the first circular hole 82, which can evaporate quickly and is less likely to condense to form smoke, thereby improving the user experience of the battery device 2. In contrast, if the diameter R of the first circular hole 82 is too large, for example, greater than 0.8 mm, the flow rate of the electrolyte vapor can decrease, which can easily condense to form smoke. If the diameter R of the first circular hole 82 is too small, for example, less than 0.03 mm, the electrolyte vapor in the accommodation space can not be easily discharged, which can cause the pressure in the accommodation space to be too high, thereby causing safety problems.

[0081] In the above structure, since the exhaust mechanism forms the first slit 81 and / or the first circular hole 82 that exhausts the gas in the accommodation space to the external atmosphere, and the size A of the first slit 81 in the width direction is in the range of 0.03mm≤A≤0.8mm, and the diameter R of the first circular hole 82 is in the range of 0.03mm≤R≤0.8mm, so that the electrolyte vapor generated by the battery monomer 6 in the thermal runaway state can be adjusted to obtain a faster flow rate through the first slit 81 and / or the first circular hole 82 to evaporate quickly, not easy to condense to form smoke, which is beneficial to improve the use experience of the battery device.

[0082] In some embodiments, referring to FIG. 7, the box 5 includes a first box wall 54, and the exhaust mechanism 8 includes a first slit 81 arranged on the first box wall 54, which communicates the external atmosphere with the accommodation space 53.

[0083] The first box wall 54 can be a wall structure in the box 5, and the first slit 81 can be an opening that communicates with the external air. By opening the first slit 81 on the first box wall 54, the first slit 81 communicates the external atmosphere with the accommodation space 53, so that the electrolyte vapor in the accommodation space 53 can quickly diffuse into the external air through the first slit 81, not easy to condense to form smoke, which is beneficial to improve the use experience of the battery device 2. Exemplarily, the exhaust mechanism 8 can also include a first circular hole 82 arranged on the first box wall 54, which communicates the external atmosphere with the accommodation space 53.

[0084] Exemplarily, referring to FIG. 8, a plurality of exhaust mechanisms 8 can be arranged in sequence along the flow direction of the electrolyte vapor on the exhaust path. In some embodiments, a plurality of first box walls 54 provided with the exhaust mechanism 8 can be arranged at intervals along the flow direction of the electrolyte vapor on the exhaust path, so that the electrolyte vapor in the accommodation space 53 can flow through the exhaust mechanism 8 on the plurality of first box walls 54 in sequence and be exhausted to the outside of the box 5.

[0085] In some embodiments, referring to FIG. 9, the box 5 includes a first box wall 54, and in the state that the exhaust mechanism 8 includes a group of slits, the exhaust mechanism 8 includes a cover 83 and an exhaust hole 542 arranged on the first box wall 54, the cover 83 is connected to the first box wall 54 and is arranged at intervals along the axial direction of the exhaust hole 542 with the first box wall 54, and the first slit 81 is formed between the cover 83 and the first box wall 54, and the first slit 81 communicates with the accommodation space 53 through the exhaust hole 542.

[0086] The first tank wall 54 can be a wall structure in the tank body 5. The exhaust hole 542 can be a through hole structure formed on the first tank wall 54, which is used to communicate the accommodation space 53 with the ambient air. Referring to FIG. 10, the cover 83 can be a plate structure which is spaced apart from the first tank wall 54. The cover 83 is spaced apart from the first tank wall 54 along the axial direction of the exhaust hole 542 and is arranged opposite to the exhaust hole 542, so that the cover 83 and the first tank wall 54 form the first gap 81 which communicates with the exhaust hole 542, and the first gap 81 communicates with the accommodation space 53, so that the electrolyte vapor in the accommodation space 53 can diffuse into the ambient air through the exhaust hole 542 and the first gap 81.

[0087] Exemplarily, the cover 83 can be located in the accommodation space 53 and spaced apart from the first tank wall 54 along the axial direction of the exhaust hole 542; the cover 83 can also be located on the side of the first tank wall 54 away from the accommodation space 53 and spaced apart from the first tank wall 54 along the axial direction of the exhaust hole 542.

[0088] In some embodiments, the cover 83 can be opposite to the exhaust hole 542 along the axial direction of the exhaust hole 542, so that the first gap 81 is a cylindrical surface structure surrounding the exhaust hole 542, so that the first gap 81 can smoothly exhaust in each direction of the radial direction.

[0089] In some embodiments, referring to FIG. 11, the exhaust mechanism 8 further comprises a valve seat 84, the cover 83 is connected to the first tank wall 54 through the valve seat 84, and the cover 83 is located on the side of the first tank wall 54 away from the accommodation space 53.

[0090] The valve seat 84 can be a component for connecting the cover 83 to the first tank wall 54, which enables the cover 83 to be stably connected to the first tank wall 54, and is conducive to maintaining the shape of the first gap 81 stable.

[0091] By arranging the cover 83 on the side of the first tank wall 54 away from the accommodation space 53, the electrolyte vapor exhausted from the accommodation space 53 can smoothly diffuse into the ambient air through the exhaust hole 542 and the first gap 81, which is conducive to improving the diffusion effect of the electrolyte vapor in the ambient air.

[0092] Exemplarily, the valve seat 84 can be welded to the side of the first tank wall 54 away from the accommodation space 53, or can be adhered to the side of the first tank wall 54 away from the accommodation space 53. Exemplarily, the valve seat 84 can also be connected to the side of the first tank wall 54 away from the accommodation space 53 through connecting bolts, connecting pins or other components.

[0093] In some embodiments, referring to FIG. 12, the valve seat 84 comprises a seat body 841 connected to the first tank wall 54 away from the containing space 53 and formed with a communication cavity 8411 around the outer side of the exhaust hole 542, and a support body 842 connected to the seat body 841 and the cover body 83, the cover body 83 being arranged away from the first tank wall 54 and forming a first gap 81 with the seat body 841, the first gap 81 being communicated with the exhaust hole 542 through the communication cavity 8411.

[0094] The seat body 841 can be a main structure in the valve seat 84 for connecting to the first tank body 51 away from the containing space 53. The support body can be a structure in the valve seat 84 connected to the seat body 841 for connecting to the cover body 83 to support the cover body 83.

[0095] Since the seat body 841 is connected to the first tank body 51 away from the containing space 53, the cover body 83 is connected to the seat body 841 through the valve seat 84 and arranged away from the first tank wall 54, so that the cover body 83 forms a first gap 81 with the seat body 841. The seat body 841 is formed with a communication cavity 8411 with both ends open by being arranged around the outer side of the exhaust hole 542, one end of which is communicated with the containing space 53 through the exhaust hole 542, and the other end is communicated with the first gap 81, so that the communication cavity 8411 can lead the electrolyte vapor in the containing space 53 to the outside away from the containing space 53, which is conducive to better diffusion of the electrolyte vapor to the outside air away from the containing space 53.

[0096] In some embodiments, at least 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.

[0097] By arranging at least part of the support body 842 in the communication cavity 8411, the support body 842 is connected between the inner wall surface of the communication cavity 8411 and the wall surface of the cover body 83 facing the seat body 841, which is conducive to improving the utilization of space by the valve seat 84.

[0098] In some embodiments, the valve seat 84 and the cover body 83 are integrally formed.

[0099] The valve seat 84 and the cover body 83 being integrally formed can be that the valve seat 84 and the cover body 83 are made by an integral molding method such as injection molding, so that the valve seat 84 and the cover body 83 can be manufactured synchronously as a whole, which not only makes the valve seat 84 and the cover body 83 easy to process and manufacture, 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 a mechanical processing method such as milling by processing a whole blank.

[0100] In some embodiments, referring to FIG. 13, in the case that the exhaust mechanism 8 comprises a set of slits, the exhaust mechanism 8 comprises a valve seat 84 having a seat body 841 connected to the box body 5, the seat body 841 having a communication cavity 8411 in communication with the accommodation space 53, a resilient member 85 connected between the cover body 83 and the seat body 841 and abutting the cover body 83 against the seat body 841; referring to FIG. 14, the resilient member 85 is configured to deform when the internal pressure of the accommodation space 53 reaches a threshold value, so as to move the cover body 83 and form a first slit 81 between the cover body 83 and the seat body 841 in communication with the communication cavity 8411.

[0101] The seat body 841 can be the seat body 841 in the valve seat 84 provided in the foregoing technical solutions, which is connected to the box body 5 and surrounds the communication cavity 8411, and the communication cavity 8411 is in communication with the accommodation space 53 through the exhaust hole 542 provided on the box body 5. The cover body 83 can be the cover body 83 provided in the foregoing technical solutions, which is arranged on the side of the seat body 841 away from the first box wall 54.

[0102] The resilient member 85 can be a component capable of abutting the cover body 83 against the seat body 841 by using the elastic restoring force of itself. The resilient member 85 is connected between the cover body 83 and the seat body 841, so that the cover body 83 can abut against the seat body 841, thereby achieving the covering of the opening of the communication cavity 8411 away from the accommodation space 53.

[0103] By configuring the resilient 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 between the cover body 83 and the seat body 841 in communication with the communication cavity 8411, so that 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 external air through the exhaust hole 542, the communication cavity 8411 and the first slit 81, thereby achieving the rapid diffusion of the external air.

[0104] In some embodiments, the valve seat 84 further comprises a support body 842, the support body 842 and the resilient member 85 are 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 resilient member 85 is connected between the support body 842 and the cover body 83.

[0105] The support body 842 can be the support body 842 in the valve seat 84 provided in the foregoing technical solutions, which is used for supporting the cover body 83. By connecting the resilient 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 resilient member 85 in the communication cavity 8411, it is beneficial to improve the utilization rate of the space.

[0106] In some embodiments, the cover 83 moves and the first gap 81 is formed between the cover 83 and the seat 841 when the pressure difference between the internal pressure of the accommodation space 53 and the external atmospheric pressure is C, where 0.08 kPa≤C≤40 kPa.

[0107] When the pressure difference between the internal pressure of the accommodation space 53 and the external atmospheric pressure is C, for example, when at least one battery cell 6 in the accommodation space 53 is in thermal runaway and the explosion-proof valve opens to release pressure, the cover 83 is separated from the seat 841 under the action of the internal gas of the accommodation space 53 and moves away from the accommodation space 53, so that a gap is formed between the cover 83 and the seat 841 to form the first gap 81.

[0108] By moving the cover 83 and forming the first gap 81 between the cover 83 and the seat 841 when the pressure difference between the internal pressure of the accommodation space 53 and the external atmospheric pressure is C, the electrolyte vapor in the accommodation space 53 can be discharged from the first gap 81 at a faster flow rate under the action of the pressure difference, the electrolyte vapor diffuses faster, and can evaporate more quickly.

[0109] By setting the range of the pressure difference C to 0.08 kPa≤C≤40 kPa, the electrolyte vapor can be discharged from the first gap 81 at a faster flow rate under the action of the pressure difference, and the accommodation space 53 is less likely to experience severe gas retention, which is beneficial to reducing the possibility of swelling of the battery device 2.

[0110] In some embodiments, the range of the pressure difference C can be set to 0.1 kPa≤C≤30 kPa. For example, the pressure difference C between the internal pressure of the accommodation space 53 and the external atmospheric pressure can be 10 kPa, 20 kPa, or 25 kPa, which allows the electrolyte vapor to be discharged from the first gap 81 at a faster flow rate and reduces the possibility of severe gas retention in the accommodation space 53, which is beneficial to reducing the possibility of swelling of the battery device 2.

[0111] In some embodiments, the exhaust mechanism 8 further includes a limiting structure 86 connected to the seat 841, part of the limiting structure 86 is located on the side of the cover 83 away from the seat 841 and is spaced apart from the cover 83, and the limiting structure 86 can block the cover 83 separated from the seat 841.

[0112] The limiting structure 86 can be a structure for limiting the distance of the cover 83 from the seat body 841 in the exhaust mechanism 8. By connecting the limiting structure 86 to the seat body 841 and spacing part of the limiting structure 86 on the side of the cover 83 away from the seat body 841, the limiting structure 86 can block the cover 83 from being separated from the seat body 841 to limit the distance of the cover 83 from the seat body 841.

[0113] 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, the connecting portion 861 is connected to the seat body 841, and the blocking portion 863 is located on the side of the cover 83 away from the seat body 841 to block the cover 83.

[0114] The connecting portion 861, the extending portion 862, and the blocking portion 863 are different parts of the limiting structure 86. The connecting portion 861 is connected to the seat body 841, the extending portion 862 is connected between the blocking portion 863 and the connecting portion 861, and the blocking portion 863 is located on the side of the cover 83 away from the seat body 841 to block the cover 863.

[0115] Exemplarily, the limiting structure 86 can be an integrally formed structure.

[0116] The limiting structure 86 can be an integrally formed structure, which can be manufactured by injection molding or other integrally forming methods, so that the connecting portion 861, the extending portion 862, and the blocking portion 863 can be manufactured synchronously as a whole, which not only makes the limiting structure 86 easy to manufacture, but also makes the overall structure of the limiting structure 86 have good strength. Exemplarily, the limiting structure 86 can also be manufactured by milling or other mechanical processing methods by processing a whole piece of blank.

[0117] In some embodiments, in the state where the cover 83 abuts against the seat body 841, the distance between the blocking portion 863 and the cover 83 along the arrangement direction of the cover 83 and the seat body 841 is A.

[0118] In the state where the cover 83 abuts against the seat body 841, by setting the distance between the blocking portion 863 and the cover 83 along the arrangement direction of the cover 83 and the seat body 841 as A, the distance of the blocking portion 863 from the seat body 841 can be limited to A, so that the cover 83 is separated from the seat body 841, and the first gap 81 formed between the seat bodies 841 has a width of A.

[0119] Exemplarily, in the case that the exhaust mechanism 8 comprises a set of slits, the size A of the first slit 81 in the width direction can be set to 0.05mm≤A≤0.5mm. Exemplarily, the size A of the first slit 81 in the width direction can be 0.2mm, 0.3mm or 0.4mm, so that the size of the first slit 81 in the width direction is small, so that a faster flow rate can be obtained when the electrolyte vapor is exhausted from the first slit 81, and the size of the first slit 81 in the width direction is sufficient, so that the electrolyte vapor is not easy to accumulate in the accommodation space 53 and can be more smoothly exhausted.

[0120] Exemplarily, in the case that the exhaust mechanism 8 comprises a set of circular holes, the diameter R of the first circular hole 82 can be set to 0.05mm≤R≤0.5mm. Exemplarily, the diameter R of the first circular hole 82 can be 0.2mm, 0.3mm or 0.4mm, so that the size of the first circular hole 82 in the width direction is small, so that a faster flow rate can be obtained when the electrolyte vapor is exhausted from the first slit 81, and the size of the first circular hole 82 in the width direction is sufficient, so that the electrolyte vapor is not easy to accumulate in the accommodation space 53 and can be more smoothly exhausted.

[0121] In some embodiments, with continued reference to FIGS. 4 and 5, a protruding structure 811 is provided at the first slit 81.

[0122] The protruding structure 811 can be a structure protruding from the edge of the first slit 81 to the inside of the first slit 81. By providing the protruding structure 811 at the first slit 81, the airflow is more likely to form turbulence when flowing out of the first slit 81, which is conducive to improving the diffusivity of the electrolyte vapor, so that the electrolyte vapor can evaporate more quickly, and the electrolyte vapor is less likely to form smoke when exhausted from the first slit 81.

[0123] Exemplarily, the cross-sectional shape of the protruding structure 811 can be rectangular, triangular or circular arc-shaped.

[0124] In some embodiments, with reference to FIG. 15, the box 5 comprises a first box wall 54 and a second box wall 55, the second box wall 55 surrounds the accommodation space 53, and the first box wall 54 is connected to the second box wall 55 and surrounds the exhaust space with the second box wall 55; the battery device 2 further comprises a pressure relief mechanism 9, the pressure relief mechanism 9 is provided 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 provided on the first box wall 54.

[0125] The first box wall 54 and the second box wall 55 are both wall structures in the box body 5. The second box wall 55 can be a wall body for enclosing the accommodating space 53 for accommodating the battery cells 6, and the first box wall 54 is connected to the second box wall 55 and encloses the exhaust space with the second box wall 55. By arranging the pressure relief mechanism 9 on the second box wall 55 and arranging the exhaust mechanism 8 on the first box wall 54, the exhaust mechanism 8 can be communicated with the accommodating space 53 through the exhaust space, the pressure relief mechanism 9 in the state that the pressure relief mechanism 9 is opened, so that the electrolyte vapor in the accommodating space 53 can enter the external air in sequence through the pressure relief mechanism 9, the exhaust space and the exhaust mechanism 8.

[0126] The pressure relief mechanism 9 can be a mechanism arranged on the second box wall 55 for relieving the internal pressure of the accommodating space 53, for example, a one-way valve, a balance valve, etc. When the internal pressure of the accommodating space 53 reaches or exceeds a preset value, the pressure relief mechanism 9 can reduce the internal pressure of the accommodating space 53 by relieving the internal substances of the accommodating space 53 to the outside of the accommodating space 53.

[0127] By arranging the exhaust mechanism 8 on the first box wall 54 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 sealing of the accommodating space 53 enclosed by the second box wall 55.

[0128] Exemplarily, the first box wall 54 provided with the exhaust mechanism 8 can be spaced apart and provided with a plurality of first box walls 54 provided with the exhaust mechanism 8 outside the second box wall 55 provided with the pressure relief mechanism 9.

[0129] In some embodiments, in the state that the exhaust mechanism 8 includes a group of first slits 81, the total cross-sectional area of the group of first slits 81 is B, 30mm 2 ≤B≤100mm 2 .

[0130] By setting the range of the total area B of all the first slits 81 in the group of slits to 30mm 2 ≤B≤100mm 2 , the electrolyte vapor is not easy to accumulate in the accommodating space 53 due to the too small total area of the group of first slits 81, and can be more smoothly discharged; and the group of first slits 81 is not easy to reduce the speed of discharging the electrolyte vapor due to the too large total area. The total area B of the group of first slits 81 can be set to 50mm 2 , 60mm 2 or 80mm 2, so that the electrolyte vapor is not easily accumulated in the accommodation space 53 due to the small total area of the first slits 81, and can be smoothly discharged, and the first slits 81 are not easily caused to reduce the speed of discharging the electrolyte vapor due to the large total area.

[0131] In some embodiments, in the case where the exhaust mechanism 8 includes a group of first circular holes 82, the total cross-sectional area of the group of first circular holes 82 is D, 30mm 2 ≤D≤100mm 2 .

[0132] By setting the total area D of all the first circular holes 82 in the group of circular holes to be in the range of 30mm 2 ≤D≤100mm 2 , the electrolyte vapor is not easily accumulated in the accommodation space 53 due to the small total area of the first circular holes 82, and can be smoothly discharged, and the first circular holes 82 are not easily caused to reduce the speed of discharging the electrolyte vapor due to the large total area. The total cross-sectional area D of the group of first circular holes 82 can be set to 50mm 2 , 60mm 2 or 80mm2, so that the electrolyte vapor is not easily accumulated in the accommodation space 53 due to the small total area of the first circular holes 82, and can be smoothly discharged, and the first circular holes 82 are not easily caused to reduce the speed of discharging the electrolyte vapor due to the large total area.

[0133] In some embodiments, in the case where the exhaust mechanism 8 includes a group of slits, a plurality of first slits 81 are provided and are arranged at intervals.

[0134] Arranging a plurality of first slits 81 at intervals on the box 5 of the battery device 2 can mean that the total area of the group of slits is inconveniently divided into a plurality of intervals, which makes the distribution of the first slits 81 more dispersed, and is beneficial to improve the uniformity of exhaust.

[0135] In some embodiments, in the case where the exhaust mechanism 8 includes a group of circular holes, a plurality of first circular holes 82 are provided and are arranged at intervals.

[0136] Arranging a plurality of first circular holes 82 at intervals on the box 5 of the battery device 2 can mean that the total area of the group of circular holes is inconveniently divided into a plurality of intervals, which makes the distribution of the first slits 81 more dispersed, and is beneficial to improve the uniformity of exhaust.

[0137] Some embodiments of the present application also provide an electric device, which includes the battery device 2 provided by the above technical solutions, and the battery device 2 is used to provide electric energy.

[0138] The electric device can be an apparatus or system of any of the application battery devices 2 described above.

[0139] According to some embodiments of the present application, the present application provides a battery device 2, which comprises a battery cell 6, a box 5 and an exhaust mechanism 8, the box 5 comprises a first box wall 54, the exhaust mechanism 8 comprises a valve seat 84, an elastic member 85, a cover 83 and an exhaust hole 542 arranged on the first box wall 54, a seat body 841 of the valve seat 84 is arranged 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 83 and the support body 842, and the elastic member 85 is configured to deform when the internal pressure of the containing space 53 reaches a threshold value, so as to move the cover 83 and form a first gap 81 between the cover 83 and the seat body 841, which is in communication with the communication cavity 8411, the size of the first gap 81 in the width direction is A, and 0.03mm≤A≤0.8mm, so that the electrolyte vapor generated by the battery cell 6 in the thermal runaway state can be discharged at a faster flow rate via the first gap 81, the electrolyte vapor diffuses faster, can evaporate quickly, is not easy to condense to form smoke, and is beneficial to improve the use experience of the battery device 2.

[0140] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: a battery cell; a case having an accommodation space in which the battery cell is disposed, the case being provided with an exhaust mechanism for communicating the accommodation space with the outside, the exhaust mechanism including a set of slits in an open state, the set of slits including at least one first slit, each of the first slits having a maximum dimension in a width direction of A, 0.03 mm≤A≤0.8 mm, and / or the exhaust mechanism including a set of round holes, the set of round holes including at least one first round hole, each of the first round holes having a diameter of R, 0.03 mm≤R≤0.8 mm.

2. The battery device of claim 1, wherein, the case including a first case wall, the exhaust mechanism including a cover and an exhaust hole provided in the first case wall in a state where the exhaust mechanism includes the set of slits, the cover being connected to the first case wall and being spaced apart from the first case wall in an axial direction of the exhaust hole, the first slits being formed between the cover and the first case wall and communicating with the accommodation space through the exhaust hole.

3. The battery device of claim 2, wherein, the exhaust mechanism further including a valve seat, the cover being connected to the first case wall via the valve seat, the cover being located on a side of the first case wall away from the accommodation space.

4. The battery device of claim 3, wherein, the valve seat including a seat body and a support body, the seat body being connected to the side of the first case wall away from the accommodation space and forming a communication cavity around an outer side of the exhaust hole, the support body being connected to the seat body and the cover, the cover being spaced apart from the seat body on a side of the seat body away from the first case wall, the first slits being formed between the cover and the seat body and communicating with the exhaust hole through the communication cavity.

5. The battery device of claim 4, wherein, at least part of the support body being located in the communication cavity, the support body being connected to an inner wall surface of the communication cavity and a wall surface of the cover facing the seat body.

6. The battery device of claim 3, wherein the valve seat and the cover being integrally formed.

7. The battery device of claim 1, wherein, in a state where the exhaust mechanism includes the set of slits, the exhaust mechanism including a valve seat having a seat body, a resilient member, and a cover, the seat body being connected to the case, the seat body having a communication cavity communicating with the accommodation space, the resilient member being connected between the cover and the seat body and causing the cover to abut against the seat body; the resilient member being configured to deform when an internal pressure of the accommodation space reaches a threshold value, to cause the cover to move, and to form the first slits between the cover and the seat body and communicating with the communication cavity.

8. The battery device of claim 7, wherein, the valve seat further including a support body, the support body and the resilient member being located in the communication cavity, the support body being connected to an inner wall surface of the communication cavity, and the resilient member being connected between the support body and the cover.

9. The battery device of claim 7, wherein, in a state where a pressure difference between an internal pressure of the accommodation space and an atmospheric pressure of the outside is C, the cover moves and the first slits are formed between the cover and the seat body, wherein 0.08 kPa≤C≤40 kPa.

10. The battery device of claim 7, wherein, The exhaust mechanism further comprises 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 arranged in a spaced manner with the cover body, and the limiting structure can block the cover body separated from the seat body.

11. The battery device of claim 10, wherein, The limiting structure comprises 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 seat body, and the blocking portion is located on the side of the cover body away from the seat body for blocking the cover body.

12. The battery device of claim 11, wherein, In the state that the cover body abuts against the seat body, along the arrangement direction of the cover body and the seat body, the distance between the blocking portion and the cover body is A.

13. The battery device of claim 1, wherein, In the state that the exhaust mechanism comprises the set of slits, 0.05mm≤A≤0.5mm; in the state that the exhaust mechanism comprises the set of round holes, 0.05mm≤R≤0.5mm.

14. The battery device of claim 1, wherein, In the state that the exhaust mechanism comprises the set of slits, the first slit is provided with a protruding structure.

15. The battery device of claim 1, wherein, The box body comprises a first box wall and a second box wall, the second box wall encloses the containing space, and the first box wall is connected to the second box wall and encloses an exhaust space with the second box wall; the battery device further comprises a pressure relief mechanism arranged on the second box wall for communicating the containing space with the exhaust space, and the exhaust mechanism is arranged on the first box wall.

16. The battery device of claim 1, wherein, In the case 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 the case where the exhaust mechanism includes a group of circular holes, the total cross-sectional area of the group of circular holes is B, 30 mm 2 ≤ D ≤ 100 mm 2 .

17. The battery device of claim 1, wherein, In the state that the exhaust mechanism comprises the set of slits, the first slit is provided with a plurality of first slits arranged in a spaced manner; in the state that the exhaust mechanism comprises the set of round holes, the first round hole is provided with a plurality of first round holes arranged in a spaced manner. 18.A power utilization device comprising the battery device according to any one of claims 1 to 17, wherein the battery device is used to provide electric energy.

Images