Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a box body, a plurality of battery monomers, at least one heat exchange element and a first structural element. The box body comprises a containing cavity and a bottom plate. The bottom plate is located at the bottom of the containing cavity. The containing cavity comprises a first area and a second area arranged along a first direction. The first area is located on the opposite sides of the second area. The first direction is perpendicular to the height direction of the box body. The plurality of battery monomers are located in the second area. The at least one heat exchange element is located in the containing cavity and is arranged on the side surface of the battery monomer. The first structural element is formed with a first channel. At least part of the first channel is located on the side of the heat exchange element close to the bottom plate. The first channel is in communication with the first area. The battery device of the application can improve the problem that the heat exchange medium in the heat exchange element flows out and affects the overall reliability and stability of the battery device by partitioning the containing cavity and arranging the first channel.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] The battery pack contains heat exchange components with a heat exchange medium that exchanges heat with the individual battery cells for thermal management. However, under prolonged exposure to the heat exchange medium, electrochemical corrosion, and alternating high and low temperatures, the heat exchange components are prone to corrosion, microcracks, and even perforation and leakage. Once a leak occurs, the heat exchange medium seeps into the bottom space of the battery cell, freely diffusing and accumulating over a large area. Due to the potential difference between the battery cell and the electrical components within the battery pack at the bottom, the leaked heat exchange medium can create a conductive path, leading to localized short circuits, arcing, or even thermal runaway, potentially reducing the overall reliability and stability of the battery pack. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one objective of this application is to provide a battery device that improves the overall reliability and stability of the battery device by addressing the problem of heat exchange medium outflow within the heat exchanger.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a housing, a plurality of battery cells, at least one heat exchanger, and a first structural member. The housing includes a receiving cavity and a bottom plate, the bottom plate being located at the bottom of the receiving cavity. The receiving cavity includes a first region and a second region arranged along a first direction, the first region being located on opposite sides of the second region, the first direction being perpendicular to the height direction of the housing. The plurality of battery cells are located in the second region. At least one heat exchanger is located in the receiving cavity, the heat exchanger being disposed on the side of the battery cells. The first structural member has a first channel, at least a portion of the first channel being located on the side of the heat exchanger near the bottom plate, the first channel communicating with the first region.

[0006] In the technical solution of this application embodiment, the heat exchange medium flowing out of the heat exchange component flows into the first channel under the action of gravity. The first channel can guide the outflowing heat exchange medium to the first area where no battery cells are set, thereby limiting the diffusion range of the outflowing heat exchange medium. In this way, the problem of disordered diffusion of the heat exchange medium at the bottom of the battery cell can be improved, the risk of short circuit, arcing or even thermal runaway caused by the contact between the heat exchange medium and the battery cell can be reduced, and the stability and reliability of the battery device operation can be improved.

[0007] In some embodiments, the first channel has an opening facing the heat exchanger, the first channel extends along a first direction, and the end of the first channel along the first direction communicates with the first region. Thus, the heat exchange medium flowing out of the heat exchanger can flow into the first channel and, guided more precisely in the direction of the first channel, flow into the first region, improving the first structural member's ability to guide the heat exchange medium.

[0008] In some embodiments, the first structural member includes a first side portion, a second side portion, and a bent portion connecting the first side portion and the second side portion. The first side portion and the second side portion are located on opposite sides of the heat exchanger, and the bent portion is located on the side of the heat exchanger closer to the bottom plate. The first side portion, the second side portion, and the bent portion together form a first channel. This allows the first structural member to effectively enclose the heat exchanger, increasing the probability that the heat exchange medium flowing out of the heat exchanger will flow into the first channel, and further reducing the probability of disordered diffusion of the heat exchange medium at the bottom of the battery cell.

[0009] In some embodiments, the first side and the second side are respectively connected to both sides of the heat exchanger. By connecting the first side and the second side to both sides of the heat exchanger, the overall position of the first structural member can be fixed, and the first channel of the first structural member can receive the heat exchange medium flowing out of the heat exchanger.

[0010] In some embodiments, the heat exchanger extends along a first direction, and the first structural member is arranged in a one-to-one correspondence with the heat exchanger. The one-to-one correspondence between the first structural member and the heat exchanger simplifies the arrangement of the first structural member and the heat exchanger.

[0011] In some embodiments, multiple battery cells are arranged into multiple battery cell groups. The multiple battery cells in each battery cell group are arranged along a first direction, and the multiple battery cell groups are arranged along a second direction perpendicular to the large-area direction of the battery cells. A heat exchanger is located between two adjacent battery cell groups. One heat exchanger can exchange heat with each battery cell in two battery cell groups, resulting in a compact structure, improved space utilization, and enhanced heat exchange uniformity.

[0012] In some embodiments, the housing also has a drain hole that communicates with the first zone. This allows the heat exchange medium guided to the first zone via the first channel to be discharged through the drain hole, further reducing the risk of leaked heat exchange medium spreading within the housing, thereby further improving the stability and reliability of the battery device operation.

[0013] In some embodiments, a first cavity is provided within the base plate, and the first cavity is connected to a drain hole. The heat exchange medium guided to the first zone can flow into the first cavity through the drain hole. The first cavity is used to collect leaked heat exchange medium, reducing the probability of secondary spread caused by the accumulation of leaked heat exchange medium in the accommodating cavity.

[0014] In some embodiments, there are two first cavities, and the two first cavities are respectively arranged corresponding to two first zones. Thus, the unused space at the edges can be used to collect leaked heat exchange medium, and the leaked heat exchange medium in the two first zones can be drained nearby, improving drainage efficiency.

[0015] In some embodiments, the base plate includes a first layer and a second layer, with a drain hole disposed on the first layer; the second layer is located on the side of the first layer away from the receiving cavity, and the first cavity is located between the first layer and the second layer. Using the first and second layers makes it easier to form a base plate with the first cavity, reducing the manufacturing difficulty.

[0016] In some embodiments, a cavity is provided between the first layer and the second layer, and the base plate further includes a spacer connected between the first layer and the second layer to define a first cavity within the cavity. The spacer isolates the first cavity from other areas of the cavity, reducing the impact of leakage from the first cavity on components in other areas of the cavity.

[0017] In some embodiments, the battery device further includes: a first leakage detection structure, disposed corresponding to the first cavity, for detecting liquid ingress into the first cavity and outputting a first feedback signal. The first leakage detection structure can detect liquid ingress into the first cavity and thus provide timely warnings based on the first feedback signal it outputs.

[0018] In some embodiments, the enclosure further includes a bottom protective plate and a second leakage detection structure. The bottom protective plate is located on the side of the bottom plate opposite to the receiving cavity, and a second cavity is formed between the bottom protective plate and the bottom plate. The second leakage detection structure is configured corresponding to the second cavity and is used to detect liquid ingress into the second cavity and output a second feedback signal. When external liquid intrudes through the gap in the bottom protective plate, it will remain in the second cavity and will not flow back into the energy compartment and electrical compartment inside the enclosure from the drain hole. The second leakage detection structure can detect liquid ingress into the second cavity and can provide timely warnings based on its output second feedback signal.

[0019] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0022] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the battery cell of the battery device in some embodiments of this application, located inside the casing;

[0024] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0025] Figure 4 for Figure 3 Enlarged view of the area within the dashed box;

[0026] Figure 5 This is a schematic diagram of the internal structure of the battery device housing according to some embodiments of this application;

[0027] Figure 6 for Figure 5 Cross-sectional view along the BB direction.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1000 vehicles;

[0030] Battery 100, first layer plate 111, second layer plate 112, controller 200, motor 300, first side 401, second side 402, bending part 403;

[0031] Zone 1, Zone 2, Box 10, Bottom plate 11, First cavity 11a, Bottom protective plate 12, Second cavity 12a, Battery cell 20, First gap 20a, Heat exchanger 30, First structural component 40, First channel 40a, First beam 50, Drain hole 60, Second beam 70, First leakage detection structure 80, Second leakage detection structure 90;

[0032] First direction X, second direction Y. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0039] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0042] When heat exchange components are subjected to prolonged exposure to heat exchange medium erosion, electrochemical corrosion, and alternating high and low temperatures, they are prone to gradual corrosion, microcracks, and even perforation and leakage. Once a leak occurs, the heat exchange medium seeps into the bottom space of the battery cell, freely diffuses, and accumulates over a large area. Due to the potential difference between the bottom region of the battery cell and the electrical components within the battery device, the leaked heat exchange medium can create a conductive path, leading to localized short circuits, arcing, or even thermal runaway, potentially reducing the overall reliability and stability of the battery device.

[0043] Currently, most solutions for protecting and handling heat exchange medium leaks rely on passive drainage. These solutions typically involve setting up drainage structures only in certain areas of the battery pack or using a single valve to drain the accumulated liquid. They lack the ability to actively guide the leaking liquid, cannot effectively limit the spread of the leaking liquid, and are difficult to block the short-circuit conductive path at the source.

[0044] Based on the above considerations, a battery device is designed, comprising: a housing, multiple battery cells, at least one heat exchanger, and a first structural component. The housing includes a receiving cavity and a bottom plate, with the bottom plate located at the bottom of the receiving cavity. The receiving cavity includes a first region and a second region arranged along a first direction, with the first region located on opposite sides of the second region. The first direction is perpendicular to the height direction of the housing. Multiple battery cells are located in the second region. At least one heat exchanger is located in the receiving cavity and is disposed on the side of the battery cells. The first structural component has a first channel, at least a portion of which is located on the side of the heat exchanger near the bottom plate, and the first channel communicates with the first region.

[0045] The heat exchange medium flowing out of the heat exchanger falls towards one side of the base plate under the influence of gravity and then flows into the first channel. The first channel can guide the outflowing heat exchange medium to the first area where no battery cells are located, thereby limiting the diffusion range of the outflowing heat exchange medium. In this way, the problem of disordered diffusion of the heat exchange medium at the bottom of the battery cells can be improved, reducing the risk of short circuits, sparking, or even thermal runaway caused by the heat exchange medium contacting the battery cells, and improving the stability and reliability of the battery device operation.

[0046] The battery device disclosed in this application can be used, but is not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power system incorporating the battery device disclosed in this application can be used to construct such an electrical device or energy storage device.

[0047] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] This application also provides an energy storage device that uses a battery as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0049] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0050] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0051] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0052] This application provides a battery device, which includes: a housing, multiple battery cells, at least one heat exchanger, and a first structural member. The housing includes a receiving cavity and a bottom plate, with the bottom plate located at the bottom of the receiving cavity. The receiving cavity includes a first region and a second region arranged along a first direction, with the first region located on opposite sides of the second region. The first direction is perpendicular to the height direction of the housing. Multiple battery cells are located in the second region. At least one heat exchanger is located in the receiving cavity and is disposed on the side of the battery cells. The first structural member has a first channel, with at least a portion of the first channel located on the side of the heat exchanger near the bottom plate, and the first channel communicating with the first region.

[0053] In some embodiments, the housing 10 includes a housing wall and a bottom plate 11, which together form an accommodating cavity. The bottom plate 11 is used to support individual battery cells, and the housing wall is arranged around the outer periphery of multiple individual battery cells.

[0054] The battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0055] The heat exchanger has a hollow structure inside, which can form a flow channel for the heat exchange medium to flow. The heat exchange medium may include at least one of water, ethylene glycol, alcohol, glycerin, etc. For example, a lower temperature heat exchange medium can be used to cool the battery cells; or, a higher temperature heat exchange medium can be used to heat the battery cells.

[0056] In some embodiments, the heat exchanger can be a harmonica tube, which has a large heat exchange area, good heat dissipation uniformity, high structural strength, and is easy to assemble.

[0057] like Figure 2 as well as Figure 3 As shown, each battery cell 20 has a heat exchanger 30 arranged on its side.

[0058] In some embodiments, each battery cell 20 may be configured with a heat exchanger 30.

[0059] In other embodiments, multiple battery cells 20 may also share a single heat exchanger 30.

[0060] In some embodiments, the heat exchanger 30 may be located on the large surface of the battery cell 20. The large surface of the battery cell 20 refers to the largest of the multiple side surfaces of the battery cell 20.

[0061] like Figure 2 As shown, since the battery cell 20 is located in the second region 2, and the heat exchanger 30 is located on one side of the battery cell 20, the heat exchanger 30 is at least located in the second region 2. The first region 1 and the second region 2 can be divided according to the area occupied by the battery cell 20 in the accommodating cavity along the first direction X. In the accommodating cavity, the area where the battery cell 20 is located is the second region 2, and the areas on both sides of the second region 2 along the first direction X are not occupied by the battery cell 20, and therefore can be divided into the first region 1. The first channel can guide the leakage of the heat exchanger 30 to the first region 1, which can realize the directional guidance of the leakage. And since the battery cell 20 is located in the second region 2, the risk of leakage spreading to the bottom of the battery cell 20 and causing short circuit or even thermal runaway can be greatly reduced.

[0062] In some embodiments, the heat exchanger 30 may be located only in the second zone 2, and leakage from the heat exchanger 30 may be guided to the first zone 1 by the first structural member.

[0063] In other embodiments, the heat exchanger 30 may also be located in the second region 2 and the first region 1. For example, the heat exchanger 30 may extend along the first direction X, the heat exchanger 30 may span the second region 2, and both ends of the heat exchanger 30 may extend at least partially into the first region 1.

[0064] refer to Figure 3 as well as Figure 4 In some embodiments, there are multiple heat exchange elements 30, and each heat exchange element 30 has a first structural member 40 on the side near the bottom plate. At least a portion of the first channel 40a of the first structural member 40 is located on the side of the heat exchange element 30 near the bottom plate. Since the heat exchange element 30 is located in the second zone 2, the first structural member 40 is at least located in the second zone 2.

[0065] In some embodiments, a first structural member 40 may be correspondingly disposed with a heat exchanger 30. Exemplarily, the heat exchanger 30 may extend along a first direction X, and a first channel 40a of the first structural member 40 may also extend along the first direction X, with the first channel 40a located below the heat exchanger 30 in the direction of gravity. Along the first direction X, the length of the first channel 40a may be equal to the length of the heat exchanger 30; or, the length of the first channel 40a may be greater than the length of the heat exchanger 30; alternatively, the heat exchanger 30 may extend from the second region 2 to the first region 1, so that leakage from the heat exchanger 30 located in the second region 2 can be guided to the first region 1 through the first channel 40a, and leakage from the heat exchanger 30 located in the first region 1 can flow directly into the first region 1. Therefore, along the first direction X, the length of the first channel 40a may be less than the length of the heat exchanger 30.

[0066] In other embodiments, a first structural member 40 may also be correspondingly configured with multiple heat exchangers 30. For example, there may be multiple heat exchangers 30, which may be arranged in multiple columns. Each column of heat exchangers 30 may include multiple heat exchangers 30 arranged along a first direction X. A first structural member 40 may be correspondingly configured with a column of heat exchangers 30. That is, the first channel 40a of the first structural member 40 extends along the first direction X and is located on the side of each heat exchanger 30 in a column of heat exchangers 30 that is close to the bottom plate.

[0067] In some embodiments, the first structural member 40 may include a main body portion, and the first channel 40a may be a groove-like structure formed in the main body portion, wherein both ends of the groove-like structure are open and the top is open. Exemplarily, the first channel 40a may include, but is not limited to, a U-shaped groove, a rectangular groove, an inverted trapezoidal groove, or an arc-shaped groove.

[0068] In other embodiments, the first structural member 40 may also include a flow guiding substrate, which may be bent to form a first channel 40a.

[0069] In some embodiments, the first structural member 40 may be located entirely on the side of the heat exchanger 30 near the bottom plate.

[0070] In other embodiments, the heat exchanger 30 may also be placed inside the first channel 40a, with a gap between the heat exchanger 30 and the bottom of the first channel 40a, such that a portion of the first channel 40a is located on the side of the heat exchanger 30 closer to the bottom plate.

[0071] The heat exchange medium flowing out of the heat exchanger 30 falls towards one side of the bottom plate under the action of gravity and then flows into the first channel 40a. The first channel 40a can guide the outflowing heat exchange medium to the first region 1 where no battery cell 20 is set, thereby limiting the diffusion range of the outflowing heat exchange medium. In this way, the problem of disordered diffusion of the heat exchange medium at the bottom of the battery cell 20 can be improved, the risk of short circuit, arcing or even thermal runaway caused by the contact between the heat exchange medium and the battery cell 20 can be reduced, and the stability and reliability of the battery device operation can be improved.

[0072] According to some embodiments of this application, the first channel has an opening facing the heat exchanger, the first channel 40a extends along a first direction X, and the end of the first channel 40a along the first direction X communicates with the first region 1.

[0073] In some embodiments, the opening of the first channel 40a may be located below the heat exchanger 30 along the direction of gravity.

[0074] In other embodiments, the heat exchanger 30 may also be located at least partially within the first channel 40a via an opening in the first channel 40a.

[0075] Regardless of the method, the opening of the first channel 40a is opened towards the heat exchanger 30, so that the heat exchange medium flowing out of the heat exchanger 30 can flow into the first channel 40a under the action of gravity.

[0076] The first structural member 40 extends along a first direction X, and the end of the first structural member 40 along the first direction X communicates with the first region 1. Therefore, the first structural member 40 can extend along the first direction X to at least cross the second region 2. Exemplarily, the end of the first structural member 40 can be located at the junction of the first region 1 and the second region 2. Exemplarily, the end of the first structural member 40 can also extend into the first region 1.

[0077] In the above technical solution, the heat exchange medium flowing out of the heat exchanger 30 can flow into the first channel 40a, and flow into the first zone 1 more accurately under the guidance of the first channel 40a, thereby improving the flow guiding capability of the first structural component 40 for the heat exchange medium.

[0078] refer to Figure 3 as well as Figure 4 According to some embodiments of this application, the first structural member 40 includes: a first side portion 401, a second side portion 402, and a bent portion 403 connected between the first side portion 401 and the second side portion 402. The first side portion 401 and the second side portion 402 are located on opposite sides of the heat exchange member 30, and the bent portion 403 is located on the side of the heat exchange member 30 near the bottom plate. The first side portion 401, the second side portion 402, and the bent portion 403 enclose and form a first channel 40a.

[0079] The first side portion 401, the second side portion 402, and the bent portion 403 together enclose and define the first channel 40a. The first side portion 401 and the second side portion 402 are spaced apart from each other away from the top of the bent portion 403 to form an opening facing the heat exchanger 30. The bent portion 403 is connected between the first side portion 401 and the second side portion 402, and is bent relative to the first side portion 401 and the second side portion 402, serving as the bottom of the first channel 40a.

[0080] In some embodiments, the first side portion 401 and the second side portion 402 may be vertical sides.

[0081] The first side portion 401, the second side portion 402, and the bent portion 403 all extend along the first direction X, so that the two ends of the first channel 40a along the first direction X are through structures.

[0082] Since the first side portion 401 and the second side portion 402 are located on opposite sides of the heat exchanger 30, and the first side portion 401 and the second side portion 402 are spaced apart from the top of the bend portion 403 to form an opening toward the heat exchanger 30, at least a portion of the heat exchanger 30 can extend into the opening, so that the heat exchange medium leaking from the heat exchanger 30 can be accurately dripped from the opening into the first channel 40a.

[0083] In the above technical solution, the first side 401 and the second side 402 are located on opposite sides of the heat exchanger 30, and the bent part 403 is located on the side of the heat exchanger 30 near the bottom plate, so that the first structural member 40 plays a better role in enclosing the heat exchanger 30, increasing the probability that the heat exchange medium flowing out of the heat exchanger 30 flows into the first channel 40a, and further reducing the probability of disordered diffusion of the heat exchange medium at the bottom of the battery cell 20.

[0084] According to some embodiments of this application, the first side portion 401 and the second side portion 402 are respectively connected to both sides of the heat exchanger 30.

[0085] In some embodiments, the first side portion 401 and the second side portion 402 may be connected to the side of the heat exchanger along the second direction Y, which is perpendicular to the first direction X and the height direction of the housing.

[0086] In some embodiments, a heat exchanger 30 may be arranged with only two battery cells 20 on both sides along the second direction Y.

[0087] In other embodiments, a heat exchanger 30 may also have multiple battery cells 20 arranged on both sides along the second direction Y. The multiple battery cells 20 located on one side of the heat exchanger 30 may be arranged along the first direction X. The heat exchanger 30 and the first channel 40a also extend along the first direction X. The first side 401 and the second side 402 of the heat exchanger 30 also extend along the first direction X.

[0088] In some embodiments, the first side 401, the second side 402 and the side of the battery cell 20 can be connected by adhesive bonding.

[0089] In some embodiments, both the first side and the second side can be a protective membrane, which covers the side of the heat exchanger.

[0090] In some embodiments, the protective film may be a puncture-resistant film.

[0091] In some embodiments, the material of the protective film may include, but is not limited to, any one of PET (Polyethylene Terephthalate) film, PI (Polyimide) film, or aramid composite film.

[0092] In some embodiments, the material of the bend 403 may be the same as the material of the protective film, which can improve the stability of the connection between the bend 403 and the protective film.

[0093] In some embodiments, the bend 403 may be integrally formed with the protective film forming the first side 401 and the second side 402.

[0094] In other embodiments, the bent portion 403 may also be connected to the protective film forming the first side portion 401 and the second side portion 402 by means of adhesive bonding.

[0095] In the above technical solution, by connecting the first side 401 and the second side 402 to the sides of the battery cells 20 on both sides of the heat exchanger 30, it is possible to fix the overall position of the first structural component 40 and enable the first channel 40a of the first structural component 40 to receive the heat exchange medium flowing out of the heat exchanger 30.

[0096] According to some embodiments of this application, the heat exchanger 30 extends along the first direction X, and the first structural member 40 is provided in a one-to-one correspondence with the heat exchanger 30.

[0097] The first channel 40a of the first structural component 40 also extends along the first direction X. The first channel 40a is correspondingly arranged with a heat exchange component 30. In this way, the heat exchange component 30 is provided with a first channel 40a on the side near the bottom plate, so that the heat exchange medium flowing out from different positions of the heat exchange component 30 can be received by the first channel 40a and guided to the first zone 1 along the first direction X through the first channel 40a.

[0098] The battery cell 20 is located in the second zone 2. The first zone 1 and the second zone 2 are arranged along the first direction X. The heat exchange component 30 extends along the first direction X. In this way, the length of the first channel 40a can be set to be shorter so as to guide the heat exchange medium along the first direction X and reduce the space occupied by the first structural component 40 in the housing 10.

[0099] In the above technical solution, the first structural component 40 and the heat exchange component 30 are arranged in a one-to-one correspondence, which can simplify the arrangement of the first structural component 40 and the heat exchange component 30.

[0100] like Figure 2 As shown, according to some embodiments of this application, multiple battery cells are arranged into multiple battery cell groups, and multiple battery cells in each battery cell group are arranged along a first direction, and multiple battery cell groups are arranged along a second direction, which is perpendicular to the large surface direction of the battery cells. The heat exchanger is located between two adjacent battery cell groups.

[0101] The heat exchanger extends along the first direction and is located between two adjacent battery cell groups. In other words, the heat exchanger has two battery cell groups on each side along the second direction, and the heat exchanger can exchange heat with each battery cell in the battery cell group located on its side.

[0102] The large surfaces of two adjacent battery cells 20 face each other, so that the heat exchanger 30 can exchange heat on the large surfaces of the battery cells 20, thereby improving the heat exchange efficiency.

[0103] The side surface of a battery cell may include two first surfaces facing each other along a first direction and two second surfaces facing each other along a second direction. The first and second surfaces are connected, and the area of ​​the second surface is larger than the area of ​​the first surface. The second surface is the larger surface of the battery cell.

[0104] In some embodiments, multiple battery cell groups may be arranged at intervals along a second direction.

[0105] like Figure 2 As shown, in some embodiments, the battery device may further include a first beam 50 located within the accommodating cavity. The first beam 50 spans the first region 1 and the second region 2 along a first direction X. In other words, the first beam 50 may extend along the first direction X, and both ends of the first beam 50 are located in the first region 1 and connected to the side wall of the housing 10. Thus, the first beam 50 divides the accommodating cavity into a first chamber and a second chamber arranged along a second direction Y. Both the first chamber and the second chamber may accommodate a battery cell assembly.

[0106] In some embodiments, the first beam 50 may be an expansion beam.

[0107] In the above technical solution, one heat exchanger 30 can exchange heat between two battery cells 20 in each battery cell group in a row of battery cells. The structure is compact, improves space utilization, and enhances heat exchange uniformity.

[0108] refer to Figure 5 According to some embodiments of this application, the housing 10 also has a drain hole 60, which is connected to the first zone 1.

[0109] The drain hole 60 is connected to the first zone 1, and the heat exchange medium located in the first zone 1 can flow out from the drain hole 60. In this way, the leakage of heat exchange medium can be directed and collected. Since the battery cell 20 is located in the second zone 2, the risk of the heat exchange medium diffusing to the bottom of the battery cell 20 and causing a short circuit or even thermal runaway can be further reduced.

[0110] In some embodiments, the housing 10 may be provided with a plurality of drain holes 60, which may be provided in correspondence with two first zones 1. Each first zone 1 may be connected to at least one drain hole 60, thereby improving the collection efficiency of leaked heat exchange medium.

[0111] In some embodiments, the shape of the drain hole 60 includes, but is not limited to, a circle, a rectangle, or other shapes.

[0112] In some embodiments, the diameter of the drain hole 60 may be less than or equal to 5 mm.

[0113] refer to Figure 2 The drain hole 60 can be opened on the bottom plate 11 of the box body 10.

[0114] In some embodiments, a first beam 50 is further provided within the accommodating cavity, dividing the accommodating cavity into a first chamber and a second chamber arranged along the second direction Y. Drainage holes 60 are respectively provided corresponding to the regions on both sides of the first beam 50 along the second direction Y; that is, the first region 1 of the first chamber and the first region 1 of the second chamber are respectively connected to the drainage holes 60. This allows the heat exchange medium flowing out from the heat exchange elements 30 on the sides of the battery cell assembly located on both sides of the first beam 50 to drain nearby, improving drainage efficiency and reducing localized liquid accumulation.

[0115] Both the first chamber and the second chamber are equipped with heat exchange components 30 and first structural components 40. Since the first beam 50 separates the accommodating chambers, the heat exchange medium leaking in the first chamber can flow out through the drain hole 60 connected to the first chamber, and the heat exchange medium leaking in the second chamber can flow out through the drain hole 60 connected to the second chamber.

[0116] In some embodiments, the battery device further includes two second beams 70 located within the accommodating cavity. The two second beams 70 are spaced apart along a second direction Y, and each second beam 70 spans a first region 1 and a second region 2 along a first direction X. A first beam 50 is located between the two second beams 70, and a plurality of battery cell groups are disposed between the two second beams 70. In other words, a battery cell group is disposed between each first beam 50 and each second beam 70. Both the first beam 50 and the second beam 70 can be expansion beams.

[0117] In some embodiments, the first beam 50 is provided with a plurality of drainage holes 60 on both sides along the second direction Y. The first region 1 located on one side of the first beam 50 along the second direction Y is connected to two drainage holes 60, one of which is located close to the first beam 50 and the other is located close to the second beam 70.

[0118] In the above technical solution, the housing 10 is provided with a drain hole 60, and the drain hole 60 is connected to the first zone 1. In this way, the heat exchange medium guided to the first zone 1 via the first channel 40a can be discharged through the drain hole 60, further reducing the risk of leaked heat exchange medium spreading in the housing 10, thereby further improving the stability and reliability of the battery device operation.

[0119] refer to Figure 5 as well as Figure 6 According to some embodiments of this application, the base plate 11 is provided with a first cavity 11a, which is connected to the drain hole 60.

[0120] The drain hole 60 extends through the base plate 11 along the thickness direction, and the first cavity 11a is located in the area where the drain hole 60 is opened, so that the first cavity 11a is directly connected to the drain hole 60.

[0121] In some embodiments, the drain hole 60 is disposed on the surface of the base plate 11 near the receiving cavity. The surface of the base plate 11 away from the receiving cavity can be a sealing surface, that is, the surface of the base plate 11 away from the receiving cavity is a continuous and complete sealed surface, used to isolate the first cavity 11a from the outer space, so that the leaked heat exchange medium will not flow out from the first cavity 11a.

[0122] In some embodiments, the first cavity 11a can be formed by two layers of the base plate 11 aligned and bonded together, wherein a groove can be formed on the inner side of one layer, the groove being used to form the first cavity 11a.

[0123] In other embodiments, the base plate 11 with the first cavity 11a can also be formed by integral molding. For example, the sheet material is blow-molded, internally inflated, cooled and shaped to form the base plate 11, with the first cavity 11a formed inside the base plate 11. Then, a drainage hole 60 is opened on one side surface of the base plate 11 corresponding to the first cavity 11a. Alternatively, reinforcing ribs, spacers, or other structures can be integrally molded inside the sheet material to divide the first cavity 11a inside the sheet material.

[0124] In the above technical solution, the heat exchange medium that is guided to the first zone 1 can flow into the first cavity 11a through the drain hole 60. The first cavity 11a is used to collect the leaked heat exchange medium in a concentrated manner, thereby reducing the probability of the leaked heat exchange medium accumulating in the accommodating cavity and causing secondary spread.

[0125] According to some embodiments of this application, there are two first cavities 11a, and the two first cavities 11a are respectively set for two first regions 1.

[0126] In other words, on the projection plane parallel to the base plate 11, the orthographic projection of the area where the two first cavities 11a are located coincides with the orthographic projection of the two first regions 1, so that the two first cavities 11a are located on both sides of the base plate 11.

[0127] In the above technical solution, the first cavity 11a is located on both sides of the base plate 11, which can collect the leaked heat exchange medium by utilizing the idle space at the edge, and the leaked heat exchange medium in the two first zones 1 can be drained nearby, thereby improving the drainage efficiency.

[0128] refer to Figure 6 According to some embodiments of this application, the base plate 11 includes: a first layer plate 111 and a second layer plate 112, with a drain hole 60 disposed on the first layer plate 111; the second layer plate 112 is located on the side of the first layer plate 111 away from the receiving cavity, and the first cavity 11a is located between the first layer plate 111 and the second layer plate 112.

[0129] The first layer plate 111 is placed at the bottom of the accommodating cavity.

[0130] In some embodiments, the first layer 111 and the second layer 112 can be prepared by integral molding, for example, the first cavity 11a can be made in a single piece of plate to form the first layer 111 and the second layer 112.

[0131] In other embodiments, the first layer plate 111 and the second layer plate 112 may also be prepared separately. At least one of the first layer plate 111 and the second layer plate 112 is formed with a groove. After the first layer plate 111 and the second layer plate 112 are stacked and connected, the position of the groove corresponds to the formation of the first cavity 11a.

[0132] In the above technical solution, the base plate 11 with the first cavity 11a is more easily formed by the first layer plate 111 and the second layer plate 112, which reduces the difficulty of preparation.

[0133] According to some embodiments of this application, a cavity is provided between the first layer plate 111 and the second layer plate 112, and the bottom plate 11 further includes: a spacer connected between the first layer plate 111 and the second layer plate 112 to define a first cavity 11a within the cavity.

[0134] In some embodiments, if there are two first cavities 11a, then there can be two isolation members. The two isolation members are spaced apart along the first direction X to define two first cavities 11a within the cavity.

[0135] In some embodiments, the spacer may be a reinforcing rib extending along the second direction Y.

[0136] In the above technical solution, the isolation component can isolate the first cavity 11a from other areas of the cavity, thereby reducing the impact of leakage in the first cavity 11a on components in other areas of the cavity.

[0137] refer to Figure 5 According to some embodiments of this application, the battery device further includes: a first leakage detection structure 80, which is disposed corresponding to the first cavity 11a, for detecting liquid ingress in the first cavity 11a and outputting a first feedback signal.

[0138] In some embodiments, the first leakage detection structure 80 may include a first detection probe that extends into the first cavity 11a to detect liquid in the first cavity 11a.

[0139] In some embodiments, the first leakage detection structure 80 can be sealed and locked to the bottom plate 11 of the housing 10.

[0140] In some embodiments, there are multiple first leakage detection structures 80, which are located at different positions. For example, there may be four first leakage detection structures 80, which are located at the four corners of the accommodating cavity, thereby improving the accuracy of leakage detection within the first cavity 11a.

[0141] In the above technical solution, the first leakage detection structure 80 can detect the liquid ingress in the first cavity 11a, and then provide timely warning based on the first feedback signal it outputs.

[0142] refer to Figure 6According to some embodiments of this application, the housing 10 further includes: a bottom protective plate 12 and a second leakage detection structure 90. The bottom protective plate 12 is located on the side of the bottom plate 11 away from the accommodating cavity, and a second cavity 12a is provided between the bottom protective plate 12 and the bottom plate 11. The second leakage detection structure 90 is provided corresponding to the second cavity 12a and is used to detect the liquid ingress in the second cavity 12a and output a second feedback signal.

[0143] The bottom guard plate 12 can protect the bottom plate 11 and reduce the probability of the bottom plate 11 being deformed by impact. The second cavity 12a between the bottom plate 11 and the bottom guard plate 12 can both allow fluid flow and act as a buffer. When the bottom guard plate 12 is impacted, the impact will not be immediately transmitted to the bottom plate 11, thus forming a buffer.

[0144] In some embodiments, a gap exists between the base plate 11 and the base guard plate 12 to form a second cavity 12a. The fluid in the second cavity 12a does not flow into the first cavity 11a.

[0145] In some embodiments, the second leakage detection structure 90 may include a second detection probe that extends into the second cavity 12a to detect liquid within the second cavity 12a.

[0146] In some embodiments, the base plate 11 may extend outside the accommodating cavity, and the second leakage detection structure 90 is located outside the accommodating cavity and is sealed and locked to the base plate 11 of the housing 10.

[0147] In some embodiments, there are multiple second leakage detection structures 90, which are located at different positions. For example, there may be four second leakage detection structures 90, which are located at the four corners of the entire battery device. This improves the accuracy of detecting leakage within the second cavity 12a.

[0148] With the battery pack located under the vehicle chassis, it is prone to bottoming out, scraping the bottom, and being hit by stones during driving. This can cause the underbody protection plate 12 to deform, crack, and fail to seal. External liquids can easily seep in through the gaps in the underbody protection plate 12, causing safety hazards such as reduced insulation of the high-voltage components of the battery pack, short circuits, or even thermal runaway.

[0149] In the above technical solution, a second cavity is provided between the bottom protective plate and the bottom plate. This way, when external liquid intrudes through the gaps in the bottom protective plate, it will remain in the second cavity and will not flow back into the energy and electrical compartments inside the housing from the drain hole. The second leakage detection structure can detect the liquid ingress into the second cavity and provide timely warnings based on its output second feedback signal.

[0150] This application provides an electrical device, including the battery device described in the above embodiments, wherein the battery device supplies power to the electrical device.

[0151] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0152] The technical solution of this application will be further described below with reference to a specific embodiment.

[0153] refer to Figures 2 to 6 The battery device includes: a housing 10, multiple battery cells 20, multiple heat exchange components 30, and a first structural component 40. The housing 10 includes a receiving cavity and a bottom plate. The bottom plate is located at the bottom of the receiving cavity. The receiving cavity includes a first region 1 and a second region 2 arranged along a first direction X. The first region 1 is located on opposite sides of the second region 2. The first direction X is perpendicular to the height direction of the housing 10. The multiple battery cells 20 are located in the second region 2. The heat exchange components 30 are located in the receiving cavity and are disposed on the side of the battery cells 20. The first structural component 40 has a first channel 40a. At least a portion of the first channel 40a is located on the side of the heat exchange component 30 near the bottom plate. The first channel communicates with the first region.

[0154] The first channel 40a extends along a first direction X, and its end along the first direction X communicates with the first region 1. The first channel 40a has an opening facing the heat exchanger 30. The first structural member 40 includes a first side portion 401, a second side portion 402, and a bent portion 403 connecting the first side portion 401 and the second side portion 402. The first side portion 401 and the second side portion 402 are located on opposite sides of the heat exchanger 30, and the bent portion 403 is located on the side of the heat exchanger 30 closer to the bottom plate. The first side portion 401, the second side portion 402, and the bent portion 403 together form the first channel 40a. The first side portion 401 and the second side portion 402 are protective films covering the opposite sides of the heat exchanger along the second direction.

[0155] Multiple battery cells are arranged into multiple battery cell groups. The multiple battery cells in each battery cell group are arranged along a first direction, and the multiple battery cell groups are arranged along a second direction, which is perpendicular to the large surface direction of the battery cells. The heat exchanger is located between two adjacent battery cell groups.

[0156] The housing 10 also has a drain hole 60, which is connected to the first zone 1. The diameter of the drain hole 60 can be less than or equal to 5 mm.

[0157] The battery device also includes a first beam 50 located within the accommodating cavity, spanning a first region 1 and a second region 2 along a first direction X; multiple battery cells 20 are arranged into multiple battery cell groups, and the multiple battery cell groups are arranged on opposite sides of the first beam 50 along a second direction Y. The battery device also includes two second beams 70 located within the accommodating cavity, spaced apart along the second direction Y. Each second beam 70 spans the first region 1 and the second region 2 along the first direction X, with the first beam 50 located between the two second beams 70, and the multiple battery cell groups located between the two second beams 70. In other words, a battery cell group is provided between each first beam 50 and each second beam 70. Multiple drain holes 60 are provided on both sides of the first beam 50 along the second direction Y, wherein two drain holes 60 are connected to the first region 1 on one side of the first beam 50 along the second direction Y, one drain hole 60 being located close to the first beam 50 and the other drain hole 60 being located close to the second beam 70.

[0158] The housing 10 has a bottom plate 11 located at the bottom of the accommodating cavity, and a drain hole 60 is disposed on the bottom plate 11. The bottom plate 11 contains a first cavity 11a, which communicates with the drain hole 60. There are two first cavities 11a, each corresponding to one of the two first zones 1. The bottom plate 11 includes a first layer plate 111 and a second layer plate 112. The drain hole 60 is located on the first layer plate 111. The second layer plate 112 is located on the side of the first layer plate 111 facing away from the accommodating cavity, and the first cavity 11a is located between the first layer plate 111 and the second layer plate 112. A cavity exists between the first layer plate 111 and the second layer plate 112. The bottom plate 11 also includes a spacer connected between the first layer plate 111 and the second layer plate 112 to define the first cavity 11a within the cavity. The battery device further includes a first leakage detection structure 80, which is disposed corresponding to the first cavity 11a, for detecting liquid ingress into the first cavity 11a and outputting a first feedback signal. There can be four first leakage detection structures 80, which are respectively located at the four corners of the accommodating cavity.

[0159] The housing 10 also includes a bottom protective plate 12, located on the side of the bottom plate 11 opposite to the receiving cavity, with a second cavity 12a between the bottom protective plate 12 and the bottom plate 11. The battery assembly also includes a second leakage detection structure 90, corresponding to the second cavity 12a, used to detect liquid ingress into the second cavity 12a and output a second feedback signal. The second leakage detection structure 90 is sealed and locked to the bottom plate 11 of the housing 10. There can be four second leakage detection structures 90, located at the four corners of the entire battery assembly.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The housing includes a receiving cavity and a bottom plate, the bottom plate being located at the bottom of the receiving cavity, the receiving cavity including a first area and a second area arranged along a first direction, the first area being located on opposite sides of the second area, the first direction being perpendicular to the height direction of the housing; Multiple battery cells are located in the second region; At least one heat exchanger is located in the accommodating cavity, and the heat exchanger is disposed on the side of the battery cell; A first structural member having a first channel, at least a portion of which is located on the side of the heat exchanger near the base plate, and the first channel communicating with the first zone.

2. The battery device according to claim 1, characterized in that, The first channel has an opening toward the heat exchanger, the first channel extends along the first direction, and the end of the first channel along the first direction communicates with the first region.

3. The battery device according to claim 2, characterized in that, The first structural member includes a first side portion, a second side portion, and a bent portion connecting the first side portion and the second side portion. The first side portion and the second side portion are located on opposite sides of the heat exchanger, and the bent portion is located on the side of the heat exchanger closer to the bottom plate. The first side portion, the second side portion, and the bent portion together form the first channel.

4. The battery device according to claim 3, characterized in that, The first side and the second side are respectively connected to both sides of the heat exchanger.

5. The battery device according to claim 1, characterized in that, The heat exchanger extends along the first direction, and the first structural member is provided in a one-to-one correspondence with the heat exchanger.

6. The battery device according to claim 5, characterized in that, Multiple battery cells are arranged into multiple battery cell groups. Multiple battery cells in each battery cell group are arranged along a first direction. Multiple battery cell groups are arranged along a second direction, which is perpendicular to the large surface direction of the battery cells. The heat exchanger is located between two adjacent battery cell groups.

7. The battery device according to any one of claims 1-6, characterized in that, The box also has a drain hole, which is connected to the first area.

8. The battery device according to claim 7, characterized in that, The base plate has a first cavity, which is connected to the drain hole.

9. The battery device according to claim 8, characterized in that, The number of the first cavities is two, and the two first cavities are respectively set to correspond to the two first areas.

10. The battery device according to claim 8, characterized in that, The base plate includes: The first layer plate, wherein the drain hole is located on the first layer plate; The second layer is located on the side of the first layer away from the accommodating cavity, and the first cavity is located between the first layer and the second layer.

11. The battery device according to claim 10, characterized in that, A cavity exists between the first layer and the second layer, and the bottom plate further includes: An isolator is connected between the first layer and the second layer to define the first cavity within the cavity.

12. The battery device according to claim 8, characterized in that, The battery device also includes: A first leakage detection structure is provided corresponding to the first cavity, and is used to detect the liquid ingress in the first cavity and output a first feedback signal.

13. The battery device according to claim 8, characterized in that, The enclosure also includes: A bottom protective plate is located on the side of the bottom plate opposite to the receiving cavity, and a second cavity is formed between the bottom protective plate and the bottom plate; The second leakage detection structure is provided corresponding to the second cavity and is used to detect the liquid ingress in the second cavity and output a second feedback signal.

14. An electrical appliance, characterized in that, The electrical device includes the battery device according to any one of claims 1-13, the battery device being used to provide electrical energy.

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